Add json-framed encoding, docs, refactor

2024-04-28 18:41:06 +02:00
parent b0eab82c93
commit 1b1e0f5a72
52 changed files with 1539 additions and 454 deletions
--- a/Readme.md
+++ b/Readme.md
@@ -150,10 +150,7 @@ Example config:

 The documentation of the currently running service version is served by the service itself:

-<https://data-api.psi.ch/api/4/documentation/>
-
-These docs are found in this repository in the directory:
-<httpret/static/documentation/>
+<https://data-api.psi.ch/api/4/docs/>


 # Setup Toolchain
--- a/apidoc/src/SUMMARY.md
+++ b/apidoc/src/SUMMARY.md
@@ -1,6 +1,7 @@
 # Summary

 [Introduction](intro.md)
+- [Backends](backends.md)
 - [Search Channels](search.md)
 - [Binned Data](bins.md)
 - [Event Data](events.md)
--- a/apidoc/src/backends.md
+++ b/apidoc/src/backends.md
@@ -0,0 +1,7 @@
+# Backends
+
+The list of available backends can be queried:
+
+```bash
+curl "https://data-api.psi.ch/api/4/backend/list"
+```
--- a/apidoc/src/events.md
+++ b/apidoc/src/events.md
@@ -6,10 +6,6 @@ Event data can be fetched like this:
 curl "https://data-api.psi.ch/api/4/events?backend=sf-databuffer&channelName=S10BC01-DBPM010:Q1&begDate=2024-02-15T12:41:00Z&endDate=2024-02-15T12:42:00Z"
 ```

-Note: if the channel changes data type within the requested date range, then the
-server will return values for that data type which covers the requested
-date range best.
-
 Parameters:
 - `backend`: the backend that the channel exists in, e.g. `sf-databuffer`.
 - `channelName`: the name of the channel.
@@ -17,3 +13,74 @@ Parameters:
 - `endDate`: end of the time range, exclusive.
 - `allowLargeResult=true` indicates that the client is prepared to accept also larger responses compared to
  what might be suitable for a typical browser.
+
+By default, events are returned as a json object.
+
+Note: if the channel changes data type within the requested date range, then the
+server will return values for that data type which covers the requested
+date range best.
+
+Note: if the server decides that the requested dataset gets "too large" then the response will contain
+the key `continueAt` which indicates that the response is incomplete and that the caller should
+issue another request with `begDate` as given by `continueAt`.
+
+
+## Events as framed JSON stream
+
+To download larger amounts of JSON data it recommended to use the `json-framed` content encoding.
+Using this encoding, the server can send the requested events as a stream of json objects, where each
+json object contains a batch of events.
+This content encoding is triggered via the `Accept: application/json-framed` header in the request.
+
+The returned body looks like:
+```
+[JSON-frame]
+[JSON-frame]
+[JSON-frame]
+... etc
+```
+
+where each `[JSON-frame]` looks like:
+```
+[length N of the following JSON object: uint32 little-endian]
+[reserved: 12 bytes of zero-padding]
+[JSON object: N bytes]
+[padding: P zero-bytes, 0 <= P <= 7, such that (N + P) mod 8 = 0]
+```
+
+
+## Events as framed CBOR stream
+
+The Concise Binary Object Representation (RFC 8949) can be a more compact option to transfer data.
+Usage of the `Accept: application/cbor-framed` header in the request causes the api to return
+the data as a stream of CBOR objects. Each CBOR-object will contain a batch of events.
+
+The http body of the response then looks like this:
+
+```
+[CBOR-frame]
+[CBOR-frame]
+[CBOR-frame]
+... etc
+```
+
+where each `[CBOR-frame]` looks like:
+```
+[length N of the following CBOR object: uint32 little-endian]
+[reserved: 12 bytes of zero-padding]
+[CBOR object: N bytes]
+[padding: P zero-bytes, 0 <= P <= 7, such that (N + P) mod 8 = 0]
+```
+
+Most returned CBOR objects are data objects and look like this in equivalent json notation:
+```json
+{
+  "tss": [1, 2, 3, 4],
+  "values": [42, 60, 55, 20]
+}
+```
+where `tss` is the array of timestamps and `values` the corresponding array of values.
+
+Note: "data" CBOR objects are currently identified by the presence of the `tss` key. There can be
+other types of CBOR objects, like log or statistics.
+The next update will add a type-tag to discriminate them, but for now, look for the key `tss`.
--- a/crates/bitshuffle/src/bitshuffle.rs
+++ b/crates/bitshuffle/src/bitshuffle.rs
@@ -68,3 +68,74 @@ pub fn lz4_decompress(inp: &[u8], out: &mut [u8]) -> Result<usize, isize> {
        Ok(ec as _)
    }
 }
+
+#[cfg(test)]
+mod _simd {
+    use std::arch::x86_64::_mm_loadu_si128;
+    use std::arch::x86_64::_mm_shuffle_epi32;
+    use std::ptr::null;
+
+    #[test]
+    fn simd_test() {
+        if is_x86_feature_detected!("sse") {
+            eprintln!("have sse 1");
+        }
+        if is_x86_feature_detected!("sse2") {
+            eprintln!("have sse 2");
+            unsafe { simd_sse_2() };
+        }
+        if is_x86_feature_detected!("sse3") {
+            eprintln!("have sse 3");
+            unsafe { simd_sse_3() };
+        }
+        if is_x86_feature_detected!("sse4.1") {
+            eprintln!("have sse 4.1");
+            unsafe { simd_sse_4_1() };
+        }
+        if is_x86_feature_detected!("sse4.2") {
+            eprintln!("have sse 4.2");
+            unsafe { simd_sse_4_2() };
+        }
+        if is_x86_feature_detected!("sse4a") {
+            eprintln!("have sse 4 a");
+        }
+        if is_x86_feature_detected!("avx") {
+            eprintln!("have avx 1");
+        }
+        if is_x86_feature_detected!("avx2") {
+            eprintln!("have avx 2");
+        }
+    }
+
+    #[target_feature(enable = "sse2")]
+    unsafe fn simd_sse_2() {
+        // _mm_loadu_si128(null());
+        eprintln!("sse 2 done");
+    }
+
+    #[target_feature(enable = "sse3")]
+    unsafe fn simd_sse_3() {
+        // core::arch::asm!();
+        // core::arch::global_asm!();
+        let a = core::arch::x86_64::_mm256_setzero_si256();
+        let b = core::arch::x86_64::_mm256_set_epi32(7, 3, 9, 11, 17, 13, 19, 21);
+        let x = core::arch::x86_64::_mm256_xor_si256(a, b);
+        core::arch::x86_64::_mm256_loadu_si256(&x as *const _);
+        // core::arch::x86_64::vpl!();
+        // core::arch::x86_64::vps!();
+        // let c = core::arch::x86_64::_mm256_shuffle_i32x4(a, b);
+        eprintln!("sse 3 done");
+    }
+
+    #[target_feature(enable = "sse4.1")]
+    unsafe fn simd_sse_4_1() {
+        // _mm_loadu_si128(null());
+        eprintln!("sse 4.1 done");
+    }
+
+    #[target_feature(enable = "sse4.2")]
+    unsafe fn simd_sse_4_2() {
+        // _mm_loadu_si128(null());
+        eprintln!("sse 4.2 done");
+    }
+}
--- a/crates/daqbuffer/Cargo.toml
+++ b/crates/daqbuffer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "daqbuffer"
-version = "0.5.0"
+version = "0.5.1-aa.0"
 authors = ["Dominik Werder <dominik.werder@gmail.com>"]
 edition = "2021"

--- a/crates/daqbuffer/src/fetch.rs
+++ b/crates/daqbuffer/src/fetch.rs
@@ -1,3 +1,5 @@
+use err::thiserror;
+use err::ThisError;
 use futures_util::future;
 use futures_util::StreamExt;
 use http::header;
@@ -5,35 +7,26 @@ use http::Method;
 use httpclient::body_empty;
 use httpclient::connect_client;
 use httpclient::http;
+use httpclient::http::StatusCode;
+use httpclient::http_body_util::BodyExt;
 use httpclient::hyper::Request;
 use httpclient::IncomingStream;
 use netpod::log::*;
 use netpod::ScalarType;
 use netpod::Shape;
-use netpod::APP_CBOR_FRAMES;
-use std::fmt;
+use netpod::APP_CBOR_FRAMED;
 use streams::cbor::FramedBytesToSitemtyDynEventsStream;
 use url::Url;

-pub struct Error {
-    msg: String,
-}
-
-impl fmt::Display for Error {
-    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-        write!(fmt, "{}", self.msg)
-    }
-}
-
-impl<T> From<T> for Error
-where
-    T: fmt::Debug,
-{
-    fn from(value: T) -> Self {
-        Self {
-            msg: format!("{value:?}"),
-        }
-    }
+#[derive(Debug, ThisError)]
+pub enum Error {
+    Url(#[from] url::ParseError),
+    NoHostname,
+    HttpBody(#[from] http::Error),
+    HttpClient(#[from] httpclient::Error),
+    Hyper(#[from] httpclient::hyper::Error),
+    #[error("RequestFailed({0})")]
+    RequestFailed(String),
 }

 pub async fn fetch_cbor(url: &str, scalar_type: ScalarType, shape: Shape) -> Result<(), Error> {
@@ -42,17 +35,35 @@ pub async fn fetch_cbor(url: &str, scalar_type: ScalarType, shape: Shape) -> Res
    let req = Request::builder()
        .method(Method::GET)
        .uri(url.to_string())
-        .header(header::HOST, url.host_str().ok_or_else(|| "NoHostname")?)
-        .header(header::ACCEPT, APP_CBOR_FRAMES)
+        .header(header::HOST, url.host_str().ok_or_else(|| Error::NoHostname)?)
+        .header(header::ACCEPT, APP_CBOR_FRAMED)
        .body(body_empty())?;
    debug!("open connection to {:?}", req.uri());
    let mut send_req = connect_client(req.uri()).await?;
    let res = send_req.send_request(req).await?;
    let (head, body) = res.into_parts();
+    if head.status != StatusCode::OK {
+        let buf = httpclient::read_body_bytes(body).await?;
+        let s = String::from_utf8_lossy(&buf);
+        let e = Error::RequestFailed(format!("request failed {:?}  {}", head, s));
+        return Err(e);
+    }
    debug!("fetch_cbor  head {head:?}");
    let stream = IncomingStream::new(body);
    let stream = FramedBytesToSitemtyDynEventsStream::new(stream, scalar_type, shape);
-    let stream = stream.map(|item| info!("{item:?}"));
+    let stream = stream
+        .map(|item| {
+            info!("{item:?}");
+            item
+        })
+        .take_while({
+            let mut b = true;
+            move |item| {
+                let ret = b;
+                b = b && item.is_ok();
+                future::ready(ret)
+            }
+        });
    stream.for_each(|_| future::ready(())).await;
    Ok(())
 }
--- a/crates/dbconn/src/channelconfig.rs
+++ b/crates/dbconn/src/channelconfig.rs
@@ -58,6 +58,7 @@ pub async fn chconf_best_matching_for_name_and_range(
            let tsc: DateTime<Utc> = r.get(0);
            let series: i64 = r.get(1);
            let scalar_type: i32 = r.get(2);
+            // TODO can I get a slice from psql driver?
            let shape_dims: Vec<i32> = r.get(3);
            let series = series as u64;
            let _scalar_type = ScalarType::from_scylla_i32(scalar_type)?;
@@ -72,12 +73,15 @@ pub async fn chconf_best_matching_for_name_and_range(
        let ch_conf = chconf_for_series(backend, rows[res].1, ncc).await?;
        Ok(ch_conf)
    } else {
-        let row = res.first().unwrap();
-        let name: String = row.get(0);
-        let series = row.get::<_, i64>(1) as u64;
-        let scalar_type = ScalarType::from_dtype_index(row.get::<_, i32>(2) as u8)?;
+        let r = res.first().unwrap();
+        let _tsc: DateTime<Utc> = r.get(0);
+        let series: i64 = r.get(1);
+        let scalar_type: i32 = r.get(2);
        // TODO can I get a slice from psql driver?
-        let shape = Shape::from_scylla_shape_dims(&row.get::<_, Vec<i32>>(3))?;
+        let shape_dims: Vec<i32> = r.get(3);
+        let series = series as u64;
+        let scalar_type = ScalarType::from_scylla_i32(scalar_type)?;
+        let shape = Shape::from_scylla_shape_dims(&shape_dims)?;
        let ret = ChConf::new(backend, series, scalar_type, shape, name);
        Ok(ret)
    }
--- a/crates/dbconn/src/channelinfo.rs
+++ b/crates/dbconn/src/channelinfo.rs
@@ -0,0 +1,66 @@
+use err::thiserror;
+use err::ThisError;
+use netpod::ScalarType;
+use netpod::Shape;
+use tokio_postgres::Client;
+
+#[derive(Debug, ThisError)]
+pub enum Error {
+    Pg(#[from] crate::pg::Error),
+    BadValue,
+}
+
+pub struct ChannelInfo {
+    pub series: u64,
+    pub backend: String,
+    pub name: String,
+    pub scalar_type: ScalarType,
+    pub shape: Shape,
+    pub kind: u16,
+}
+
+pub async fn info_for_series_ids(series_ids: &[u64], pg: &Client) -> Result<Vec<ChannelInfo>, Error> {
+    let (ord, seriess) = series_ids
+        .iter()
+        .enumerate()
+        .fold((Vec::new(), Vec::new()), |mut a, x| {
+            a.0.push(x.0 as i32);
+            a.1.push(*x.1 as i64);
+            a
+        });
+    let sql = concat!(
+        "with q1 as (",
+        " select * from unnest($1, $2) as inp (ord, series)",
+        ")",
+        "select q1.ord, q1.series, t.facility, t.channel, t.scalar_type, t.shape_dims, t.kind",
+        " from q1",
+        " join series_by_channel t on t.series = q1.series",
+        " order by q1.ord",
+    );
+    use crate::pg::Type;
+    let st = pg.prepare_typed(sql, &[Type::INT4_ARRAY, Type::INT8_ARRAY]).await?;
+    let rows = pg.query(&st, &[&ord, &seriess]).await?;
+    let mut ret = Vec::new();
+    for row in rows {
+        let series: i64 = row.get(1);
+        let backend: String = row.get(2);
+        let channel: String = row.get(3);
+        let scalar_type: i32 = row.get(4);
+        let shape_dims: Vec<i32> = row.get(5);
+        let kind: i16 = row.get(6);
+        let series = series as u64;
+        let scalar_type = ScalarType::from_scylla_i32(scalar_type).map_err(|_| Error::BadValue)?;
+        let shape = Shape::from_scylla_shape_dims(&shape_dims).map_err(|_| Error::BadValue)?;
+        let kind = kind as u16;
+        let e = ChannelInfo {
+            series,
+            backend,
+            name: channel,
+            scalar_type,
+            shape,
+            kind,
+        };
+        ret.push(e);
+    }
+    Ok(ret)
+}
--- a/crates/dbconn/src/dbconn.rs
+++ b/crates/dbconn/src/dbconn.rs
@@ -1,9 +1,11 @@
 pub mod channelconfig;
+pub mod channelinfo;
 pub mod query;
 pub mod scan;
 pub mod search;

 pub mod pg {
+    pub use tokio_postgres::types::Type;
    pub use tokio_postgres::Client;
    pub use tokio_postgres::Error;
    pub use tokio_postgres::NoTls;
--- a/crates/httpclient/Cargo.toml
+++ b/crates/httpclient/Cargo.toml
@@ -15,7 +15,7 @@ http = "1.0.0"
 http-body = "1.0.0"
 http-body-util = "0.1.0"
 hyper = { version = "1.0.1", features = ["http1", "http2", "client", "server"] }
-hyper-tls = { version = "0.6.0" }
+#hyper-tls = { version = "0.6.0" }
 hyper-util = { version = "0.1.1", features = ["full"] }
 bytes = "1.5.0"
 async-channel = "1.9.0"
--- a/crates/httpclient/src/httpclient.rs
+++ b/crates/httpclient/src/httpclient.rs
@@ -194,6 +194,8 @@ pub enum Error {
    Http,
 }

+impl std::error::Error for Error {}
+
 impl From<std::io::Error> for Error {
    fn from(_: std::io::Error) -> Self {
        Self::IO
@@ -324,13 +326,9 @@ pub async fn connect_client(uri: &http::Uri) -> Result<SendRequest<StreamBody>,
 pub async fn read_body_bytes(mut body: hyper::body::Incoming) -> Result<Bytes, Error> {
    let mut buf = BytesMut::new();
    while let Some(x) = body.frame().await {
-        match x {
-            Ok(mut x) => {
-                if let Some(x) = x.data_mut() {
-                    buf.put(x);
-                }
-            }
-            Err(e) => return Err(e.into()),
+        let mut frame = x?;
+        if let Some(x) = frame.data_mut() {
+            buf.put(x);
        }
    }
    Ok(buf.freeze())
--- a/crates/httpret/src/api4/accounting.rs
+++ b/crates/httpret/src/api4/accounting.rs
@@ -20,6 +20,9 @@ use netpod::req_uri_to_url;
 use netpod::FromUrl;
 use netpod::NodeConfigCached;
 use query::api4::AccountingIngestedBytesQuery;
+use query::api4::AccountingToplistQuery;
+use serde::Deserialize;
+use serde::Serialize;

 pub struct AccountingIngestedBytes {}

@@ -73,7 +76,7 @@ impl AccountingIngestedBytes {
            .as_ref()
            .ok_or_else(|| Error::with_public_msg_no_trace(format!("no scylla configured")))?;
        let scy = scyllaconn::conn::create_scy_session(scyco).await?;
-        let mut stream = scyllaconn::accounting::AccountingStreamScylla::new(q.range().try_into()?, scy);
+        let mut stream = scyllaconn::accounting::totals::AccountingStreamScylla::new(q.range().try_into()?, scy);
        let mut ret = AccountingEvents::empty();
        while let Some(item) = stream.next().await {
            let mut item = item?;
@@ -82,3 +85,83 @@ impl AccountingIngestedBytes {
        Ok(ret)
    }
 }
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Toplist {
+    toplist: Vec<(String, u64, u64)>,
+}
+
+pub struct AccountingToplistCounts {}
+
+impl AccountingToplistCounts {
+    pub fn handler(req: &Requ) -> Option<Self> {
+        if req.uri().path().starts_with("/api/4/accounting/toplist/counts") {
+            Some(Self {})
+        } else {
+            None
+        }
+    }
+
+    pub async fn handle(&self, req: Requ, ctx: &ReqCtx, ncc: &NodeConfigCached) -> Result<StreamResponse, Error> {
+        if req.method() == Method::GET {
+            if accepts_json_or_all(req.headers()) {
+                match self.handle_get(req, ctx, ncc).await {
+                    Ok(x) => Ok(x),
+                    Err(e) => {
+                        error!("{e}");
+                        let e2 = e.to_public_error();
+                        let s = serde_json::to_string(&e2)?;
+                        Ok(response(StatusCode::INTERNAL_SERVER_ERROR).body(body_string(s))?)
+                    }
+                }
+            } else {
+                Ok(response(StatusCode::BAD_REQUEST).body(body_empty())?)
+            }
+        } else {
+            Ok(response(StatusCode::METHOD_NOT_ALLOWED).body(body_empty())?)
+        }
+    }
+
+    async fn handle_get(&self, req: Requ, ctx: &ReqCtx, ncc: &NodeConfigCached) -> Result<StreamResponse, Error> {
+        let url = req_uri_to_url(req.uri())?;
+        let qu = AccountingToplistQuery::from_url(&url)?;
+        let res = self.fetch_data(qu, ctx, ncc).await?;
+        let body = ToJsonBody::from(&res).into_body();
+        Ok(response(StatusCode::OK).body(body)?)
+    }
+
+    async fn fetch_data(
+        &self,
+        qu: AccountingToplistQuery,
+        _ctx: &ReqCtx,
+        ncc: &NodeConfigCached,
+    ) -> Result<Toplist, Error> {
+        let scyco = ncc
+            .node_config
+            .cluster
+            .scylla
+            .as_ref()
+            .ok_or_else(|| Error::with_public_msg_no_trace(format!("no scylla configured")))?;
+        let scy = scyllaconn::conn::create_scy_session(scyco).await?;
+        let pgconf = &ncc.node_config.cluster.database;
+        let pg = dbconn::create_connection(&pgconf).await?;
+        let mut top1 = scyllaconn::accounting::toplist::read_ts(qu.ts().0, scy).await?;
+        top1.sort_by_bytes();
+        let mut ret = Toplist { toplist: Vec::new() };
+        let series_ids: Vec<_> = top1.usage().iter().take(qu.limit() as _).map(|x| x.0).collect();
+        let infos = dbconn::channelinfo::info_for_series_ids(&series_ids, &pg)
+            .await
+            .map_err(Error::from_to_string)?;
+        let mut it = top1.usage().iter();
+        for info in infos {
+            let h = it.next().ok_or_else(|| Error::with_msg_no_trace("logic error"))?;
+            if info.series != h.0 {
+                let e = Error::with_msg_no_trace(format!("mismatch {} != {}", info.series, h.0));
+                warn!("{e}");
+                return Err(e);
+            }
+            ret.toplist.push((info.name, h.1, h.2));
+        }
+        Ok(ret)
+    }
+}
--- a/crates/httpret/src/api4/docs.rs
+++ b/crates/httpret/src/api4/docs.rs
@@ -72,6 +72,7 @@ fn extract_all_files() -> Contents {
    }
 }

+// .
 fn blob() -> &'static [u8] {
    include_bytes!(concat!("../../../../apidoc/book.cbor"))
 }
@@ -84,7 +85,7 @@ impl DocsHandler {
    }

    pub fn handler(req: &Requ) -> Option<Self> {
-        if req.uri().path().starts_with(Self::path_prefix()) {
+        if req.uri().path().starts_with(Self::path_prefix()) || req.uri().path().starts_with("/api/4/documentation") {
            Some(Self {})
        } else {
            None
@@ -93,6 +94,13 @@ impl DocsHandler {

    pub async fn handle(&self, req: Requ, _ctx: &ReqCtx) -> Result<StreamResponse, Error> {
        let path = req.uri().path();
+        if path.starts_with("/api/4/documentation") {
+            let ret = http::Response::builder()
+                .status(StatusCode::TEMPORARY_REDIRECT)
+                .header(http::header::LOCATION, "/api/4/docs/")
+                .body(body_empty())?;
+            return Ok(ret);
+        }
        if path == "/api/4/docs" {
            let ret = http::Response::builder()
                .status(StatusCode::TEMPORARY_REDIRECT)
--- a/crates/httpret/src/api4/events.rs
+++ b/crates/httpret/src/api4/events.rs
@@ -1,7 +1,8 @@
 use crate::bodystream::response_err_msg;
 use crate::channelconfig::chconf_from_events_quorum;
 use crate::err::Error;
-use crate::requests::accepts_cbor_frames;
+use crate::requests::accepts_cbor_framed;
+use crate::requests::accepts_json_framed;
 use crate::requests::accepts_json_or_all;
 use crate::response;
 use crate::ToPublicResponse;
@@ -9,6 +10,7 @@ use bytes::Bytes;
 use bytes::BytesMut;
 use futures_util::future;
 use futures_util::stream;
+use futures_util::Stream;
 use futures_util::StreamExt;
 use http::Method;
 use http::StatusCode;
@@ -59,8 +61,10 @@ impl EventsHandler {

 async fn plain_events(req: Requ, ctx: &ReqCtx, node_config: &NodeConfigCached) -> Result<StreamResponse, Error> {
    let url = req_uri_to_url(req.uri())?;
-    if accepts_cbor_frames(req.headers()) {
-        Ok(plain_events_cbor(url, req, ctx, node_config).await?)
+    if accepts_cbor_framed(req.headers()) {
+        Ok(plain_events_cbor_framed(url, req, ctx, node_config).await?)
+    } else if accepts_json_framed(req.headers()) {
+        Ok(plain_events_json_framed(url, req, ctx, node_config).await?)
    } else if accepts_json_or_all(req.headers()) {
        Ok(plain_events_json(url, req, ctx, node_config).await?)
    } else {
@@ -69,32 +73,62 @@ async fn plain_events(req: Requ, ctx: &ReqCtx, node_config: &NodeConfigCached) -
    }
 }

-async fn plain_events_cbor(url: Url, req: Requ, ctx: &ReqCtx, ncc: &NodeConfigCached) -> Result<StreamResponse, Error> {
+async fn plain_events_cbor_framed(
+    url: Url,
+    req: Requ,
+    ctx: &ReqCtx,
+    ncc: &NodeConfigCached,
+) -> Result<StreamResponse, Error> {
    let evq = PlainEventsQuery::from_url(&url).map_err(|e| e.add_public_msg(format!("Can not understand query")))?;
    let ch_conf = chconf_from_events_quorum(&evq, ctx, ncc)
        .await?
        .ok_or_else(|| Error::with_msg_no_trace("channel not found"))?;
-    info!("plain_events_cbor  chconf_from_events_quorum: {ch_conf:?}  {req:?}");
+    info!("plain_events_cbor_framed  chconf_from_events_quorum: {ch_conf:?}  {req:?}");
    let open_bytes = OpenBoxedBytesViaHttp::new(ncc.node_config.cluster.clone());
-    let stream = streams::plaineventscbor::plain_events_cbor(&evq, ch_conf, ctx, Box::pin(open_bytes)).await?;
+    let stream = streams::plaineventscbor::plain_events_cbor_stream(&evq, ch_conf, ctx, Box::pin(open_bytes)).await?;
    use future::ready;
    let stream = stream
        .flat_map(|x| match x {
            Ok(y) => {
                use bytes::BufMut;
                let buf = y.into_inner();
-                let mut b2 = BytesMut::with_capacity(8);
+                let adv = (buf.len() + 7) / 8 * 8;
+                let pad = adv - buf.len();
+                let mut b2 = BytesMut::with_capacity(16);
                b2.put_u32_le(buf.len() as u32);
-                stream::iter([Ok::<_, Error>(b2.freeze()), Ok(buf)])
+                b2.put_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
+                let mut b3 = BytesMut::with_capacity(16);
+                b3.put_slice(&[0, 0, 0, 0, 0, 0, 0, 0][..pad]);
+                stream::iter([Ok::<_, Error>(b2.freeze()), Ok(buf), Ok(b3.freeze())])
+            }
+            Err(e) => {
+                let e = Error::with_msg_no_trace(e.to_string());
+                stream::iter([Err(e), Ok(Bytes::new()), Ok(Bytes::new())])
            }
-            // TODO handle other cases
-            _ => stream::iter([Ok(Bytes::new()), Ok(Bytes::new())]),
        })
        .filter(|x| if let Ok(x) = x { ready(x.len() > 0) } else { ready(true) });
    let ret = response(StatusCode::OK).body(body_stream(stream))?;
    Ok(ret)
 }

+async fn plain_events_json_framed(
+    url: Url,
+    req: Requ,
+    ctx: &ReqCtx,
+    ncc: &NodeConfigCached,
+) -> Result<StreamResponse, Error> {
+    let evq = PlainEventsQuery::from_url(&url).map_err(|e| e.add_public_msg(format!("Can not understand query")))?;
+    let ch_conf = chconf_from_events_quorum(&evq, ctx, ncc)
+        .await?
+        .ok_or_else(|| Error::with_msg_no_trace("channel not found"))?;
+    info!("plain_events_json_framed  chconf_from_events_quorum: {ch_conf:?}  {req:?}");
+    let open_bytes = OpenBoxedBytesViaHttp::new(ncc.node_config.cluster.clone());
+    let stream = streams::plaineventsjson::plain_events_json_stream(&evq, ch_conf, ctx, Box::pin(open_bytes)).await?;
+    let stream = bytes_chunks_to_framed(stream);
+    let ret = response(StatusCode::OK).body(body_stream(stream))?;
+    Ok(ret)
+}
+
 async fn plain_events_json(
    url: Url,
    req: Requ,
@@ -133,3 +167,32 @@ async fn plain_events_json(
    info!("{self_name}  response created");
    Ok(ret)
 }
+
+fn bytes_chunks_to_framed<S, T>(stream: S) -> impl Stream<Item = Result<Bytes, Error>>
+where
+    S: Stream<Item = Result<T, err::Error>>,
+    T: Into<Bytes>,
+{
+    use future::ready;
+    stream
+        // TODO unify this map to padded bytes for both json and cbor output
+        .flat_map(|x| match x {
+            Ok(y) => {
+                use bytes::BufMut;
+                let buf = y.into();
+                let adv = (buf.len() + 7) / 8 * 8;
+                let pad = adv - buf.len();
+                let mut b2 = BytesMut::with_capacity(16);
+                b2.put_u32_le(buf.len() as u32);
+                b2.put_slice(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
+                let mut b3 = BytesMut::with_capacity(16);
+                b3.put_slice(&[0, 0, 0, 0, 0, 0, 0, 0][..pad]);
+                stream::iter([Ok::<_, Error>(b2.freeze()), Ok(buf), Ok(b3.freeze())])
+            }
+            Err(e) => {
+                let e = Error::with_msg_no_trace(e.to_string());
+                stream::iter([Err(e), Ok(Bytes::new()), Ok(Bytes::new())])
+            }
+        })
+        .filter(|x| if let Ok(x) = x { ready(x.len() > 0) } else { ready(true) })
+}
--- a/crates/httpret/src/httpret.rs
+++ b/crates/httpret/src/httpret.rs
@@ -105,6 +105,7 @@ pub async fn host(node_config: NodeConfigCached, service_version: ServiceVersion
    use std::str::FromStr;
    let bind_addr = SocketAddr::from_str(&format!("{}:{}", node_config.node.listen(), node_config.node.port))?;

+    // tokio::net::TcpSocket::new_v4()?.listen(200)?
    let listener = TcpListener::bind(bind_addr).await?;
    loop {
        let (stream, addr) = if let Ok(x) = listener.accept().await {
@@ -323,6 +324,8 @@ async fn http_service_inner(
        Ok(h.handle(req, &node_config).await?)
    } else if let Some(h) = channelconfig::AmbigiousChannelNames::handler(&req) {
        Ok(h.handle(req, &node_config).await?)
+    } else if let Some(h) = api4::accounting::AccountingToplistCounts::handler(&req) {
+        Ok(h.handle(req, ctx, &node_config).await?)
    } else if let Some(h) = api4::accounting::AccountingIngestedBytes::handler(&req) {
        Ok(h.handle(req, ctx, &node_config).await?)
    } else if path == "/api/4/prebinned" {
--- a/crates/httpret/src/proxy.rs
+++ b/crates/httpret/src/proxy.rs
@@ -190,6 +190,8 @@ async fn proxy_http_service_inner(
        h.handle(req, ctx, &proxy_config, service_version).await
    } else if path == "/api/4/backends" {
        Ok(backends(req, proxy_config).await?)
+    } else if let Some(h) = api4::backend::BackendListHandler::handler(&req) {
+        h.handle(req, ctx, &proxy_config).await
    } else if let Some(h) = api4::ChannelSearchAggHandler::handler(&req) {
        h.handle(req, ctx, &proxy_config).await
    } else if let Some(h) = api4::events::EventsHandler::handler(&req) {
@@ -499,19 +501,31 @@ pub async fn proxy_backend_query<QT>(
 where
    QT: fmt::Debug + FromUrl + AppendToUrl + HasBackend + HasTimeout,
 {
-    let (head, _body) = req.into_parts();
-    // TODO will we need some mechanism to modify the necessary url?
-    let url = req_uri_to_url(&head.uri)?;
-    let query = match QT::from_url(&url) {
+    let url = req_uri_to_url(req.uri())?;
+    let mut query = match QT::from_url(&url) {
        Ok(k) => k,
        Err(_) => {
-            let msg = format!("malformed request or missing parameters  {head:?}");
+            let msg = format!("malformed request or missing parameters  {:?}", req.uri());
            warn!("{msg}");
            return Ok(response_err_msg(StatusCode::BAD_REQUEST, msg)?);
        }
    };
-    debug!("proxy_backend_query  {query:?}  {head:?}");
-    let query_host = get_query_host_for_backend(&query.backend(), proxy_config)?;
+    debug!("proxy_backend_query  {:?}  {:?}", query, req.uri());
+    let timeout = query.timeout();
+    let timeout_next = timeout.saturating_sub(Duration::from_millis(1000));
+    debug!("timeout {timeout:?}  timeout_next {timeout_next:?}");
+    query.set_timeout(timeout_next);
+    let query = query;
+    let backend = query.backend();
+    let uri_path = proxy_backend_query_helper_uri_path(req.uri().path(), &url);
+    debug!("uri_path {uri_path}");
+    let query_host = get_query_host_for_backend(backend, proxy_config)?;
+    let mut url = Url::parse(&format!("{}{}", query_host, uri_path))?;
+    query.append_to_url(&mut url);
+    proxy_backend_query_inner(req.headers(), url, timeout, ctx, proxy_config).await
+}
+
+fn proxy_backend_query_helper_uri_path(path: &str, url: &Url) -> String {
    // TODO remove this special case
    // SPECIAL CASE:
    // Since the inner proxy is not yet handling map-pulse requests without backend,
@@ -519,7 +533,7 @@ where
    // Instead, url needs to get parsed and formatted.
    // In general, the caller of this function should be able to provide a url, or maybe
    // better a closure so that the url can even depend on backend.
-    let uri_path: String = if url.as_str().contains("/map/pulse/") {
+    if url.as_str().contains("/map/pulse/") {
        match MapPulseQuery::from_url(&url) {
            Ok(qu) => {
                debug!("qu {qu:?}");
@@ -531,26 +545,30 @@ where
            }
        }
    } else {
-        head.uri.path().into()
-    };
-    debug!("uri_path {uri_path}");
-    let mut url = Url::parse(&format!("{}{}", query_host, uri_path))?;
-    query.append_to_url(&mut url);
+        path.into()
+    }
+}

-    let mut req = Request::builder()
+pub async fn proxy_backend_query_inner(
+    headers: &http::HeaderMap,
+    url: Url,
+    timeout: Duration,
+    ctx: &ReqCtx,
+    _proxy_config: &ProxyConfig,
+) -> Result<StreamResponse, Error> {
+    let host = url
+        .host_str()
+        .ok_or_else(|| Error::with_msg_no_trace("no host in url"))?;
+    let mut req2 = Request::builder()
        .method(http::Method::GET)
        .uri(url.to_string())
-        .header(
-            header::HOST,
-            url.host_str()
-                .ok_or_else(|| Error::with_msg_no_trace("no host in url"))?,
-        )
+        .header(header::HOST, host)
        .header(X_DAQBUF_REQID, ctx.reqid());
    {
-        let hs = req
+        let hs = req2
            .headers_mut()
            .ok_or_else(|| Error::with_msg_no_trace("can not set headers"))?;
-        for (hn, hv) in &head.headers {
+        for (hn, hv) in headers {
            if hn == header::HOST {
            } else if hn == X_DAQBUF_REQID {
            } else {
@@ -558,23 +576,27 @@ where
            }
        }
    }
-    debug!("send request {req:?}");
-    let req = req.body(body_empty())?;
+
+    debug!("send request {req2:?}");
+    let req2 = req2.body(body_empty())?;

    let fut = async move {
-        debug!("requesting  {:?}  {:?}  {:?}", req.method(), req.uri(), req.headers());
-        let mut send_req = httpclient::httpclient::connect_client(req.uri()).await?;
-        let res = send_req.send_request(req).await?;
+        debug!(
+            "requesting  {:?}  {:?}  {:?}",
+            req2.method(),
+            req2.uri(),
+            req2.headers()
+        );
+        let mut send_req = httpclient::httpclient::connect_client(req2.uri()).await?;
+        let res = send_req.send_request(req2).await?;
        Ok::<_, Error>(res)
    };

-    let res = tokio::time::timeout(Duration::from_millis(5000), fut)
-        .await
-        .map_err(|_| {
-            let e = Error::with_msg_no_trace(format!("timeout trying to make sub request"));
-            warn!("{e}");
-            e
-        })??;
+    let res = tokio::time::timeout(timeout, fut).await.map_err(|_| {
+        let e = Error::with_msg_no_trace(format!("timeout trying to make sub request"));
+        warn!("{e}");
+        e
+    })??;

    {
        use bytes::Bytes;
--- a/crates/httpret/src/proxy/api4.rs
+++ b/crates/httpret/src/proxy/api4.rs
@@ -1,3 +1,4 @@
+pub mod backend;
 pub mod caioclookup;
 pub mod events;

--- a/crates/httpret/src/proxy/api4/backend.rs
+++ b/crates/httpret/src/proxy/api4/backend.rs
@@ -0,0 +1,39 @@
+use crate::bodystream::response;
+use crate::err::Error;
+use crate::requests::accepts_json_or_all;
+use http::Method;
+use http::StatusCode;
+use httpclient::body_empty;
+use httpclient::body_string;
+use httpclient::Requ;
+use httpclient::StreamResponse;
+use netpod::ProxyConfig;
+use netpod::ReqCtx;
+
+pub struct BackendListHandler {}
+
+impl BackendListHandler {
+    pub fn handler(req: &Requ) -> Option<Self> {
+        if req.uri().path() == "/api/4/backend/list" {
+            Some(Self {})
+        } else {
+            None
+        }
+    }
+
+    pub async fn handle(&self, req: Requ, _ctx: &ReqCtx, _node_config: &ProxyConfig) -> Result<StreamResponse, Error> {
+        if req.method() == Method::GET {
+            if accepts_json_or_all(req.headers()) {
+                let res = serde_json::json!({
+                    "backends_available": ["sf-databuffer"]
+                });
+                let body = serde_json::to_string(&res)?;
+                Ok(response(StatusCode::OK).body(body_string(body))?)
+            } else {
+                Ok(response(StatusCode::BAD_REQUEST).body(body_empty())?)
+            }
+        } else {
+            Ok(response(StatusCode::METHOD_NOT_ALLOWED).body(body_empty())?)
+        }
+    }
+}
--- a/crates/httpret/src/proxy/api4/events.rs
+++ b/crates/httpret/src/proxy/api4/events.rs
@@ -1,8 +1,8 @@
 use crate::bodystream::response;
-use crate::bodystream::response_err_msg;
 use crate::err::Error;
 use crate::proxy::get_query_host_for_backend;
-use crate::requests::accepts_cbor_frames;
+use crate::requests::accepts_cbor_framed;
+use crate::requests::accepts_json_framed;
 use crate::requests::accepts_json_or_all;
 use crate::ReqCtx;
 use http::header;
@@ -22,7 +22,8 @@ use netpod::req_uri_to_url;
 use netpod::FromUrl;
 use netpod::HasBackend;
 use netpod::ProxyConfig;
-use netpod::APP_CBOR;
+use netpod::APP_CBOR_FRAMED;
+use netpod::APP_JSON_FRAMED;
 use query::api4::events::PlainEventsQuery;

 pub struct EventsHandler {}
@@ -44,14 +45,10 @@ impl EventsHandler {
        if req.method() != Method::GET {
            Ok(response(StatusCode::METHOD_NOT_ALLOWED).body(body_empty())?)
        } else {
-            if accepts_cbor_frames(req.headers()) {
-                // self.handle_cbor(req, ctx, proxy_config).await
-                // Ok(crate::proxy::proxy_backend_query::<PlainEventsQuery>(req, ctx, proxy_config).await?)
-                warn!("TODO enabe cbor endpoint");
-                Ok(response_err_msg(
-                    StatusCode::INTERNAL_SERVER_ERROR,
-                    format!("cbor endpoint currently disabled"),
-                )?)
+            if accepts_cbor_framed(req.headers()) {
+                self.handle_framed(req, APP_CBOR_FRAMED, ctx, proxy_config).await
+            } else if accepts_json_framed(req.headers()) {
+                self.handle_framed(req, APP_JSON_FRAMED, ctx, proxy_config).await
            } else if accepts_json_or_all(req.headers()) {
                Ok(crate::proxy::proxy_backend_query::<PlainEventsQuery>(req, ctx, proxy_config).await?)
            } else {
@@ -60,26 +57,33 @@ impl EventsHandler {
        }
    }

-    async fn handle_cbor(&self, req: Requ, ctx: &ReqCtx, proxy_config: &ProxyConfig) -> Result<StreamResponse, Error> {
+    async fn handle_framed(
+        &self,
+        req: Requ,
+        accept: &str,
+        ctx: &ReqCtx,
+        proxy_config: &ProxyConfig,
+    ) -> Result<StreamResponse, Error> {
        let (head, _body) = req.into_parts();
        let url = req_uri_to_url(&head.uri)?;
        let pairs = get_url_query_pairs(&url);
        let evq = PlainEventsQuery::from_pairs(&pairs)?;
-        info!("{evq:?}");
-        // Ok(response(StatusCode::INTERNAL_SERVER_ERROR).body(body_empty())?)
-
-        // get_random_query_host_for_backend
+        debug!("{evq:?}");
        let query_host = get_query_host_for_backend(evq.backend(), proxy_config)?;
-
-        // TODO this ignores the fragment
-        let url_str = format!("{}{}", query_host, head.uri.path_and_query().unwrap());
-        info!("try to contact {url_str}");
-
+        let url_str = format!(
+            "{}{}",
+            query_host,
+            head.uri
+                .path_and_query()
+                .ok_or_else(|| Error::with_msg_no_trace("uri contains no path"))?
+        );
+        debug!("try to contact {url_str}");
        let uri: Uri = url_str.parse()?;
+        let host = uri.host().ok_or_else(|| Error::with_msg_no_trace("no host in url"))?;
        let req = Request::builder()
            .method(Method::GET)
-            .header(header::HOST, uri.host().unwrap())
-            .header(header::ACCEPT, APP_CBOR)
+            .header(header::HOST, host)
+            .header(header::ACCEPT, accept)
            .header(ctx.header_name(), ctx.header_value())
            .uri(&uri)
            .body(body_empty())?;
@@ -87,10 +91,10 @@ impl EventsHandler {
        let res = client.send_request(req).await?;
        let (head, body) = res.into_parts();
        if head.status != StatusCode::OK {
-            error!("backend returned error: {head:?}");
+            warn!("backend returned error: {head:?}");
            Ok(response(StatusCode::INTERNAL_SERVER_ERROR).body(body_empty())?)
        } else {
-            info!("backend returned OK");
+            debug!("backend returned OK");
            Ok(response(StatusCode::OK).body(body_stream(StreamIncoming::new(body)))?)
        }
    }
--- a/crates/httpret/src/pulsemap.rs
+++ b/crates/httpret/src/pulsemap.rs
@@ -845,6 +845,11 @@ impl HasTimeout for MapPulseQuery {
    fn timeout(&self) -> Duration {
        MAP_PULSE_QUERY_TIMEOUT
    }
+
+    fn set_timeout(&mut self, timeout: Duration) {
+        // TODO
+        // self.timeout = Some(timeout);
+    }
 }

 impl FromUrl for MapPulseQuery {
--- a/crates/httpret/src/requests.rs
+++ b/crates/httpret/src/requests.rs
@@ -1,30 +1,28 @@
 use httpclient::http::header;
 use httpclient::http::header::HeaderMap;
 use netpod::ACCEPT_ALL;
-use netpod::APP_CBOR_FRAMES;
+use netpod::APP_CBOR_FRAMED;
 use netpod::APP_JSON;
+use netpod::APP_JSON_FRAMED;
 use netpod::APP_OCTET;

 pub fn accepts_json_or_all(headers: &HeaderMap) -> bool {
-    let accept_def = APP_JSON;
-    let accept = headers
-        .get(header::ACCEPT)
-        .map_or(accept_def, |k| k.to_str().unwrap_or(accept_def));
-    accept.contains(APP_JSON) || accept.contains(ACCEPT_ALL)
+    let h = get_accept_or(APP_JSON, headers);
+    h.contains(APP_JSON) || h.contains(ACCEPT_ALL)
 }

 pub fn accepts_octets(headers: &HeaderMap) -> bool {
-    let accept_def = "";
-    let accept = headers
-        .get(header::ACCEPT)
-        .map_or(accept_def, |k| k.to_str().unwrap_or(accept_def));
-    accept.contains(APP_OCTET)
+    get_accept_or("", headers).contains(APP_OCTET)
 }

-pub fn accepts_cbor_frames(headers: &HeaderMap) -> bool {
-    let accept_def = "";
-    let accept = headers
-        .get(header::ACCEPT)
-        .map_or(accept_def, |k| k.to_str().unwrap_or(accept_def));
-    accept.contains(APP_CBOR_FRAMES)
+pub fn accepts_cbor_framed(headers: &HeaderMap) -> bool {
+    get_accept_or("", headers).contains(APP_CBOR_FRAMED)
+}
+
+pub fn accepts_json_framed(headers: &HeaderMap) -> bool {
+    get_accept_or("", headers).contains(APP_JSON_FRAMED)
+}
+
+fn get_accept_or<'a>(def: &'a str, headers: &'a HeaderMap) -> &'a str {
+    headers.get(header::ACCEPT).map_or(def, |k| k.to_str().unwrap_or(def))
 }
--- a/crates/items_0/src/items_0.rs
+++ b/crates/items_0/src/items_0.rs
@@ -149,6 +149,7 @@ pub trait Events:
    fn pulses(&self) -> &VecDeque<u64>;
    fn frame_type_id(&self) -> u32;
    fn to_min_max_avg(&mut self) -> Box<dyn Events>;
+    fn to_json_vec_u8(&self) -> Vec<u8>;
    fn to_cbor_vec_u8(&self) -> Vec<u8>;
 }

@@ -269,6 +270,10 @@ impl Events for Box<dyn Events> {
        Events::to_min_max_avg(self.as_mut())
    }

+    fn to_json_vec_u8(&self) -> Vec<u8> {
+        Events::to_json_vec_u8(self.as_ref())
+    }
+
    fn to_cbor_vec_u8(&self) -> Vec<u8> {
        Events::to_cbor_vec_u8(self.as_ref())
    }
--- a/crates/items_0/src/scalar_ops.rs
+++ b/crates/items_0/src/scalar_ops.rs
@@ -169,8 +169,9 @@ fn equal_string(a: &String, b: &String) -> bool {
    a == b
 }

-fn add_int<T: ops::AddAssign>(a: &mut T, b: &T) {
-    ops::AddAssign::add_assign(a, todo!());
+fn _add_int<T: ops::AddAssign>(a: &mut T, b: &T) {
+    let _ = b;
+    ops::AddAssign::add_assign(a, err::todoval());
 }

 macro_rules! add_int {
@@ -193,22 +194,36 @@ macro_rules! add_string {

 macro_rules! div_int {
    ($a:expr, $b:expr) => {
+        // TODO what is this used for?
+
        // TODO for average calculation, the accumulator must be large enough!
        // Use u64 for all ints, and f32 for all floats.
        // Therefore, the name "add" is too general.
        //*$a /= $b;
+        {
+            let _ = $a;
+            let _ = $b;
+        }
    };
 }

 macro_rules! div_bool {
    ($a:expr, $b:expr) => {
-        //
+        // TODO what is this used for?
+        {
+            let _ = $a;
+            let _ = $b;
+        }
    };
 }

 macro_rules! div_string {
    ($a:expr, $b:expr) => {
-        //
+        // TODO what is this used for?
+        {
+            let _ = $a;
+            let _ = $b;
+        }
    };
 }

--- a/crates/items_2/src/channelevents.rs
+++ b/crates/items_2/src/channelevents.rs
@@ -915,6 +915,16 @@ impl Events for ChannelEvents {
        }
    }

+    fn to_json_vec_u8(&self) -> Vec<u8> {
+        match self {
+            ChannelEvents::Events(item) => item.to_json_vec_u8(),
+            ChannelEvents::Status(item) => {
+                error!("TODO convert status to json");
+                Vec::new()
+            }
+        }
+    }
+
    fn to_cbor_vec_u8(&self) -> Vec<u8> {
        match self {
            ChannelEvents::Events(item) => item.to_cbor_vec_u8(),
--- a/crates/items_2/src/eventfull.rs
+++ b/crates/items_2/src/eventfull.rs
@@ -1,6 +1,5 @@
 use crate::framable::FrameType;
 use crate::merger::Mergeable;
-use bitshuffle::bitshuffle_decompress;
 use bytes::BytesMut;
 use err::thiserror;
 use err::ThisError;
@@ -281,11 +280,12 @@ fn decompress(databuf: &[u8], type_size: u32) -> Result<Vec<u8>, DecompError> {
        ele_count_2,
        ele_count_exp
    );
-    let mut decomp = Vec::with_capacity(type_size as usize * ele_count as usize);
+    let mut decomp: Vec<u8> = Vec::with_capacity(type_size as usize * ele_count as usize);
    unsafe {
        decomp.set_len(decomp.capacity());
    }
-    match bitshuffle_decompress(&databuf[12..], &mut decomp, ele_count as _, type_size as _, 0) {
+    // #[cfg(DISABLED)]
+    match bitshuffle::bitshuffle_decompress(&databuf[12..], &mut decomp, ele_count as _, type_size as _, 0) {
        Ok(c1) => {
            if 12 + c1 != databuf.len() {
                Err(DecompError::UnusedBytes)
@@ -299,6 +299,7 @@ fn decompress(databuf: &[u8], type_size: u32) -> Result<Vec<u8>, DecompError> {
        }
        Err(_) => Err(DecompError::BitshuffleError),
    }
+    // todo!("bitshuffle not available")
 }

 impl EventFull {
--- a/crates/items_2/src/eventsdim0.rs
+++ b/crates/items_2/src/eventsdim0.rs
@@ -965,6 +965,17 @@ impl<STY: ScalarOps> Events for EventsDim0<STY> {
        Box::new(dst)
    }

+    fn to_json_vec_u8(&self) -> Vec<u8> {
+        let ret = EventsDim0ChunkOutput {
+            // TODO use &mut to swap the content
+            tss: self.tss.clone(),
+            pulses: self.pulses.clone(),
+            values: self.values.clone(),
+            scalar_type: STY::scalar_type_name().into(),
+        };
+        serde_json::to_vec(&ret).unwrap()
+    }
+
    fn to_cbor_vec_u8(&self) -> Vec<u8> {
        let ret = EventsDim0ChunkOutput {
            // TODO use &mut to swap the content
@@ -995,7 +1006,7 @@ impl<STY: ScalarOps> EventsDim0TimeBinner<STY> {
    }

    pub fn new(binrange: BinnedRangeEnum, do_time_weight: bool) -> Result<Self, Error> {
-        trace!("{}::new  binrange {binrange:?}", Self::type_name());
+        trace!("{}::new  binrange {:?}", Self::type_name(), binrange);
        let rng = binrange
            .range_at(0)
            .ok_or_else(|| Error::with_msg_no_trace("empty binrange"))?;
--- a/crates/items_2/src/eventsdim1.rs
+++ b/crates/items_2/src/eventsdim1.rs
@@ -48,22 +48,22 @@ macro_rules! trace2 {
 }

 #[derive(Clone, PartialEq, Serialize, Deserialize)]
-pub struct EventsDim1<NTY> {
+pub struct EventsDim1<STY> {
    pub tss: VecDeque<u64>,
    pub pulses: VecDeque<u64>,
-    pub values: VecDeque<Vec<NTY>>,
+    pub values: VecDeque<Vec<STY>>,
 }

-impl<NTY> EventsDim1<NTY> {
+impl<STY> EventsDim1<STY> {
    #[inline(always)]
-    pub fn push(&mut self, ts: u64, pulse: u64, value: Vec<NTY>) {
+    pub fn push(&mut self, ts: u64, pulse: u64, value: Vec<STY>) {
        self.tss.push_back(ts);
        self.pulses.push_back(pulse);
        self.values.push_back(value);
    }

    #[inline(always)]
-    pub fn push_front(&mut self, ts: u64, pulse: u64, value: Vec<NTY>) {
+    pub fn push_front(&mut self, ts: u64, pulse: u64, value: Vec<STY>) {
        self.tss.push_front(ts);
        self.pulses.push_front(pulse);
        self.values.push_front(value);
@@ -78,25 +78,25 @@ impl<NTY> EventsDim1<NTY> {
    }
 }

-impl<NTY> AsAnyRef for EventsDim1<NTY>
+impl<STY> AsAnyRef for EventsDim1<STY>
 where
-    NTY: ScalarOps,
+    STY: ScalarOps,
 {
    fn as_any_ref(&self) -> &dyn Any {
        self
    }
 }

-impl<NTY> AsAnyMut for EventsDim1<NTY>
+impl<STY> AsAnyMut for EventsDim1<STY>
 where
-    NTY: ScalarOps,
+    STY: ScalarOps,
 {
    fn as_any_mut(&mut self) -> &mut dyn Any {
        self
    }
 }

-impl<NTY> Empty for EventsDim1<NTY> {
+impl<STY> Empty for EventsDim1<STY> {
    fn empty() -> Self {
        Self {
            tss: VecDeque::new(),
@@ -106,9 +106,9 @@ impl<NTY> Empty for EventsDim1<NTY> {
    }
 }

-impl<NTY> fmt::Debug for EventsDim1<NTY>
+impl<STY> fmt::Debug for EventsDim1<STY>
 where
-    NTY: fmt::Debug,
+    STY: fmt::Debug,
 {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        if false {
@@ -133,7 +133,7 @@ where
    }
 }

-impl<NTY> WithLen for EventsDim1<NTY> {
+impl<STY> WithLen for EventsDim1<STY> {
    fn len(&self) -> usize {
        self.tss.len()
    }
@@ -167,13 +167,13 @@ impl<STY: ScalarOps> HasTimestampDeque for EventsDim1<STY> {

 items_0::impl_range_overlap_info_events!(EventsDim1);

-impl<NTY> TimeBinnableType for EventsDim1<NTY>
+impl<STY> TimeBinnableType for EventsDim1<STY>
 where
-    NTY: ScalarOps,
+    STY: ScalarOps,
 {
    // TODO
-    type Output = BinsDim0<NTY>;
-    type Aggregator = EventsDim1Aggregator<NTY>;
+    type Output = BinsDim0<STY>;
+    type Aggregator = EventsDim1Aggregator<STY>;

    fn aggregator(range: SeriesRange, x_bin_count: usize, do_time_weight: bool) -> Self::Aggregator {
        let self_name = std::any::type_name::<Self>();
@@ -313,38 +313,38 @@ impl<STY: ScalarOps> EventsDim1CollectorOutput<STY> {
    }
 }

-impl<NTY> AsAnyRef for EventsDim1CollectorOutput<NTY>
+impl<STY> AsAnyRef for EventsDim1CollectorOutput<STY>
 where
-    NTY: ScalarOps,
+    STY: ScalarOps,
 {
    fn as_any_ref(&self) -> &dyn Any {
        self
    }
 }

-impl<NTY> AsAnyMut for EventsDim1CollectorOutput<NTY>
+impl<STY> AsAnyMut for EventsDim1CollectorOutput<STY>
 where
-    NTY: ScalarOps,
+    STY: ScalarOps,
 {
    fn as_any_mut(&mut self) -> &mut dyn Any {
        self
    }
 }

-impl<NTY: ScalarOps> WithLen for EventsDim1CollectorOutput<NTY> {
+impl<STY: ScalarOps> WithLen for EventsDim1CollectorOutput<STY> {
    fn len(&self) -> usize {
        self.values.len()
    }
 }

-impl<NTY: ScalarOps> ToJsonResult for EventsDim1CollectorOutput<NTY> {
+impl<STY: ScalarOps> ToJsonResult for EventsDim1CollectorOutput<STY> {
    fn to_json_result(&self) -> Result<Box<dyn ToJsonBytes>, Error> {
        let k = serde_json::to_value(self)?;
        Ok(Box::new(k))
    }
 }

-impl<NTY: ScalarOps> Collected for EventsDim1CollectorOutput<NTY> {}
+impl<STY: ScalarOps> Collected for EventsDim1CollectorOutput<STY> {}

 impl<STY: ScalarOps> CollectorType for EventsDim1Collector<STY> {
    type Input = EventsDim1<STY>;
@@ -442,23 +442,23 @@ impl<STY: ScalarOps> CollectableType for EventsDim1<STY> {
 }

 #[derive(Debug)]
-pub struct EventsDim1Aggregator<NTY> {
+pub struct EventsDim1Aggregator<STY> {
    range: SeriesRange,
    count: u64,
-    min: NTY,
-    max: NTY,
+    min: STY,
+    max: STY,
    sumc: u64,
    sum: f32,
    int_ts: u64,
    last_seen_ts: u64,
-    last_seen_val: Option<NTY>,
+    last_seen_val: Option<STY>,
    did_min_max: bool,
    do_time_weight: bool,
    events_taken_count: u64,
    events_ignored_count: u64,
 }

-impl<NTY> Drop for EventsDim1Aggregator<NTY> {
+impl<STY> Drop for EventsDim1Aggregator<STY> {
    fn drop(&mut self) {
        // TODO collect as stats for the request context:
        trace!(
@@ -469,7 +469,7 @@ impl<NTY> Drop for EventsDim1Aggregator<NTY> {
    }
 }

-impl<NTY: ScalarOps> EventsDim1Aggregator<NTY> {
+impl<STY: ScalarOps> EventsDim1Aggregator<STY> {
    pub fn new(range: SeriesRange, do_time_weight: bool) -> Self {
        /*let int_ts = range.beg;
        Self {
@@ -491,7 +491,7 @@ impl<NTY: ScalarOps> EventsDim1Aggregator<NTY> {
    }

    // TODO reduce clone.. optimize via more traits to factor the trade-offs?
-    fn apply_min_max(&mut self, val: NTY) {
+    fn apply_min_max(&mut self, val: STY) {
        trace!(
            "apply_min_max  val {:?}  last_val {:?}  count {}  sumc {:?}  min {:?}  max {:?}",
            val,
@@ -515,7 +515,7 @@ impl<NTY: ScalarOps> EventsDim1Aggregator<NTY> {
        }
    }

-    fn apply_event_unweight(&mut self, val: NTY) {
+    fn apply_event_unweight(&mut self, val: STY) {
        trace!("TODO check again result_reset_unweight");
        err::todo();
        let vf = val.as_prim_f32_b();
@@ -619,7 +619,7 @@ impl<NTY: ScalarOps> EventsDim1Aggregator<NTY> {
        todo!()
    }

-    fn result_reset_unweight(&mut self, range: SeriesRange, _expand: bool) -> BinsDim0<NTY> {
+    fn result_reset_unweight(&mut self, range: SeriesRange, _expand: bool) -> BinsDim0<STY> {
        /*trace!("TODO check again result_reset_unweight");
        err::todo();
        let (min, max, avg) = if self.sumc > 0 {
@@ -650,7 +650,7 @@ impl<NTY: ScalarOps> EventsDim1Aggregator<NTY> {
        todo!()
    }

-    fn result_reset_time_weight(&mut self, range: SeriesRange, expand: bool) -> BinsDim0<NTY> {
+    fn result_reset_time_weight(&mut self, range: SeriesRange, expand: bool) -> BinsDim0<STY> {
        // TODO check callsite for correct expand status.
        /*if expand {
            debug!("result_reset_time_weight calls apply_event_time_weight");
@@ -689,9 +689,9 @@ impl<NTY: ScalarOps> EventsDim1Aggregator<NTY> {
    }
 }

-impl<NTY: ScalarOps> TimeBinnableTypeAggregator for EventsDim1Aggregator<NTY> {
-    type Input = EventsDim1<NTY>;
-    type Output = BinsDim0<NTY>;
+impl<STY: ScalarOps> TimeBinnableTypeAggregator for EventsDim1Aggregator<STY> {
+    type Input = EventsDim1<STY>;
+    type Output = BinsDim0<STY>;

    fn range(&self) -> &SeriesRange {
        &self.range
@@ -724,9 +724,9 @@ impl<NTY: ScalarOps> TimeBinnableTypeAggregator for EventsDim1Aggregator<NTY> {
    }
 }

-impl<NTY: ScalarOps> TimeBinnable for EventsDim1<NTY> {
+impl<STY: ScalarOps> TimeBinnable for EventsDim1<STY> {
    fn time_binner_new(&self, binrange: BinnedRangeEnum, do_time_weight: bool) -> Box<dyn TimeBinner> {
-        let ret = EventsDim1TimeBinner::<NTY>::new(binrange, do_time_weight).unwrap();
+        let ret = EventsDim1TimeBinner::<STY>::new(binrange, do_time_weight).unwrap();
        Box::new(ret)
    }

@@ -938,6 +938,17 @@ impl<STY: ScalarOps> Events for EventsDim1<STY> {
        Box::new(item)
    }

+    fn to_json_vec_u8(&self) -> Vec<u8> {
+        let ret = EventsDim1ChunkOutput {
+            // TODO use &mut to swap the content
+            tss: self.tss.clone(),
+            pulses: self.pulses.clone(),
+            values: self.values.clone(),
+            scalar_type: STY::scalar_type_name().into(),
+        };
+        serde_json::to_vec(&ret).unwrap()
+    }
+
    fn to_cbor_vec_u8(&self) -> Vec<u8> {
        let ret = EventsDim1ChunkOutput {
            // TODO use &mut to swap the content
@@ -953,14 +964,18 @@ impl<STY: ScalarOps> Events for EventsDim1<STY> {
 }

 #[derive(Debug)]
-pub struct EventsDim1TimeBinner<NTY: ScalarOps> {
+pub struct EventsDim1TimeBinner<STY: ScalarOps> {
    edges: VecDeque<u64>,
-    agg: EventsDim1Aggregator<NTY>,
-    ready: Option<<EventsDim1Aggregator<NTY> as TimeBinnableTypeAggregator>::Output>,
+    agg: EventsDim1Aggregator<STY>,
+    ready: Option<<EventsDim1Aggregator<STY> as TimeBinnableTypeAggregator>::Output>,
    range_complete: bool,
 }

-impl<NTY: ScalarOps> EventsDim1TimeBinner<NTY> {
+impl<STY: ScalarOps> EventsDim1TimeBinner<STY> {
+    fn type_name() -> &'static str {
+        any::type_name::<Self>()
+    }
+
    fn new(binrange: BinnedRangeEnum, do_time_weight: bool) -> Result<Self, Error> {
        /*if edges.len() < 2 {
            return Err(Error::with_msg_no_trace(format!("need at least 2 edges")));
@@ -981,6 +996,22 @@ impl<NTY: ScalarOps> EventsDim1TimeBinner<NTY> {
            range_complete: false,
        };
        Ok(ret)*/
+
+        // trace!("{}::new  binrange {:?}", Self::type_name(), binrange);
+        // let rng = binrange
+        //     .range_at(0)
+        //     .ok_or_else(|| Error::with_msg_no_trace("empty binrange"))?;
+        // let agg = EventsDim0Aggregator::new(rng, do_time_weight);
+        // let ret = Self {
+        //     binrange,
+        //     rix: 0,
+        //     rng: Some(agg.range().clone()),
+        //     agg,
+        //     ready: None,
+        //     range_final: false,
+        // };
+        // Ok(ret)
+
        todo!()
    }

@@ -1003,7 +1034,7 @@ impl<NTY: ScalarOps> EventsDim1TimeBinner<NTY> {
    }
 }

-impl<NTY: ScalarOps> TimeBinner for EventsDim1TimeBinner<NTY> {
+impl<STY: ScalarOps> TimeBinner for EventsDim1TimeBinner<STY> {
    fn bins_ready_count(&self) -> usize {
        match &self.ready {
            Some(k) => k.len(),
@@ -1152,7 +1183,7 @@ impl<NTY: ScalarOps> TimeBinner for EventsDim1TimeBinner<NTY> {
    }

    fn empty(&self) -> Box<dyn TimeBinned> {
-        let ret = <EventsDim1Aggregator<NTY> as TimeBinnableTypeAggregator>::Output::empty();
+        let ret = <EventsDim1Aggregator<STY> as TimeBinnableTypeAggregator>::Output::empty();
        Box::new(ret)
    }

--- a/crates/items_2/src/eventsxbindim0.rs
+++ b/crates/items_2/src/eventsxbindim0.rs
@@ -370,6 +370,10 @@ impl<STY: ScalarOps> Events for EventsXbinDim0<STY> {
        Box::new(dst)
    }

+    fn to_json_vec_u8(&self) -> Vec<u8> {
+        todo!()
+    }
+
    fn to_cbor_vec_u8(&self) -> Vec<u8> {
        todo!()
    }
--- a/crates/items_2/src/test.rs
+++ b/crates/items_2/src/test.rs
@@ -1,5 +1,7 @@
 #[cfg(test)]
 pub mod eventsdim0;
+#[cfg(test)]
+pub mod eventsdim1;

 use crate::binnedcollected::BinnedCollected;
 use crate::binsdim0::BinsDim0CollectedResult;
--- a/crates/items_2/src/test/eventsdim1.rs
+++ b/crates/items_2/src/test/eventsdim1.rs
--- a/crates/netpod/src/netpod.rs
+++ b/crates/netpod/src/netpod.rs
@@ -44,22 +44,23 @@ use std::task::Poll;
 use std::time::Duration;
 use std::time::Instant;
 use std::time::SystemTime;
+use std::time::UNIX_EPOCH;
 use timeunits::*;
 use url::Url;

 pub const APP_JSON: &str = "application/json";
 pub const APP_JSON_LINES: &str = "application/jsonlines";
 pub const APP_OCTET: &str = "application/octet-stream";
-pub const APP_CBOR: &str = "application/cbor";
-pub const APP_CBOR_FRAMES: &str = "application/cbor-frames";
+pub const APP_CBOR_FRAMED: &str = "application/cbor-framed";
+pub const APP_JSON_FRAMED: &str = "application/json-framed";
 pub const ACCEPT_ALL: &str = "*/*";
 pub const X_DAQBUF_REQID: &str = "x-daqbuffer-request-id";

-pub const CONNECTION_STATUS_DIV: u64 = timeunits::DAY;
-pub const TS_MSP_GRID_UNIT: u64 = timeunits::SEC * 10;
-pub const TS_MSP_GRID_SPACING: u64 = 6 * 2;
+pub const CONNECTION_STATUS_DIV: DtMs = DtMs::from_ms_u64(1000 * 60 * 60);
+// pub const TS_MSP_GRID_UNIT: DtMs = DtMs::from_ms_u64(1000 * 10);
+// pub const TS_MSP_GRID_SPACING: u64 = 6 * 2;

-pub const EMIT_ACCOUNTING_SNAP: u64 = 60 * 10;
+pub const EMIT_ACCOUNTING_SNAP: DtMs = DtMs::from_ms_u64(1000 * 60 * 10);

 pub const DATETIME_FMT_0MS: &str = "%Y-%m-%dT%H:%M:%SZ";
 pub const DATETIME_FMT_3MS: &str = "%Y-%m-%dT%H:%M:%S.%3fZ";
@@ -68,6 +69,31 @@ pub const DATETIME_FMT_9MS: &str = "%Y-%m-%dT%H:%M:%S.%9fZ";

 const TEST_BACKEND: &str = "testbackend-00";

+pub struct OnDrop<F>
+where
+    F: FnOnce() -> (),
+{
+    f: Option<F>,
+}
+
+impl<F> OnDrop<F>
+where
+    F: FnOnce() -> (),
+{
+    pub fn new(f: F) -> Self {
+        Self { f: Some(f) }
+    }
+}
+
+impl<F> Drop for OnDrop<F>
+where
+    F: FnOnce() -> (),
+{
+    fn drop(&mut self) {
+        self.f.take().map(|x| x());
+    }
+}
+
 pub fn is_false<T>(x: T) -> bool
 where
    T: std::borrow::Borrow<bool>,
@@ -1198,7 +1224,7 @@ impl Shape {
            )))
        } else if k == 1 {
            Ok(Shape::Scalar)
-        } else if k <= 1024 * 32 {
+        } else if k <= 1024 * 3000 {
            Ok(Shape::Wave(k))
        } else {
            Err(Error::with_public_msg_no_trace(format!(
@@ -1338,7 +1364,7 @@ where
    pub ix: [T; 2],
 }

-#[derive(Clone, PartialEq, PartialOrd, Eq, Ord)]
+#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Eq, Ord)]
 pub struct DtNano(u64);

 impl DtNano {
@@ -1357,8 +1383,13 @@ impl DtNano {
    pub fn ms(&self) -> u64 {
        self.0 / MS
    }
+
+    pub fn to_i64(&self) -> i64 {
+        self.0 as i64
+    }
 }

+#[cfg(DISABLED)]
 impl fmt::Debug for DtNano {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let sec = self.0 / SEC;
@@ -1412,7 +1443,24 @@ mod dt_nano_serde {
    }
 }

-#[derive(Clone, PartialEq, PartialOrd, Eq, Ord)]
+#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Eq, Ord)]
+pub struct DtMs(u64);
+
+impl DtMs {
+    pub const fn from_ms_u64(x: u64) -> Self {
+        Self(x)
+    }
+
+    pub const fn ms(&self) -> u64 {
+        self.0 / MS
+    }
+
+    pub const fn to_i64(&self) -> i64 {
+        self.0 as i64
+    }
+}
+
+#[derive(Copy, Clone, PartialEq, PartialOrd, Eq, Ord)]
 pub struct TsNano(pub u64);

 mod ts_nano_ser {
@@ -1469,37 +1517,45 @@ mod ts_nano_ser {
 }

 impl TsNano {
-    pub fn from_ns(ns: u64) -> Self {
+    pub const fn from_ns(ns: u64) -> Self {
        Self(ns)
    }

-    pub fn from_ms(ns: u64) -> Self {
+    pub const fn from_ms(ns: u64) -> Self {
        Self(MS * ns)
    }

-    pub fn ns(&self) -> u64 {
+    pub const fn ns(&self) -> u64 {
        self.0
    }

-    pub fn ms(&self) -> u64 {
+    pub const fn ms(&self) -> u64 {
        self.0 / MS
    }

-    pub fn sub(self, v: Self) -> Self {
+    pub const fn sub(self, v: DtNano) -> Self {
        Self(self.0 - v.0)
    }

-    pub fn add_ns(self, v: u64) -> Self {
+    pub const fn delta(self, v: Self) -> DtNano {
+        DtNano(self.0 - v.0)
+    }
+
+    pub const fn add_ns(self, v: u64) -> Self {
        Self(self.0 + v)
    }

-    pub fn mul(self, v: u64) -> Self {
+    pub const fn mul(self, v: u64) -> Self {
        Self(self.0 * v)
    }

-    pub fn div(self, v: u64) -> Self {
+    pub const fn div(self, v: u64) -> Self {
        Self(self.0 / v)
    }
+
+    pub const fn to_ts_ms(self) -> TsMs {
+        TsMs::from_ms_u64(self.ms())
+    }
 }

 impl fmt::Debug for TsNano {
@@ -2294,13 +2350,41 @@ impl<Tz: TimeZone> ToNanos for DateTime<Tz> {
    }
 }

-#[derive(Clone, PartialEq, PartialOrd, Eq, Ord)]
+#[derive(Debug, Copy, Clone, PartialEq, PartialOrd, Eq, Ord)]
 pub struct TsMs(pub u64);

 impl TsMs {
-    pub fn to_u64(self) -> u64 {
+    pub const fn from_ms_u64(x: u64) -> Self {
+        Self(x)
+    }
+
+    pub const fn from_ns_u64(x: u64) -> Self {
+        Self(x / 1000000)
+    }
+
+    pub fn from_system_time(st: SystemTime) -> Self {
+        let tsunix = st.duration_since(UNIX_EPOCH).unwrap_or(Duration::ZERO);
+        let x = tsunix.as_secs() * 1000 + tsunix.subsec_millis() as u64;
+        Self::from_ms_u64(x)
+    }
+
+    pub const fn ms(self) -> u64 {
        self.0
    }
+
+    pub const fn to_u64(self) -> u64 {
+        self.0
+    }
+
+    pub const fn to_i64(self) -> i64 {
+        self.0 as i64
+    }
+
+    pub const fn to_grid_02(self, grid: DtMs) -> (Self, DtMs) {
+        let msp = TsMs(self.0 / grid.0 * grid.0);
+        let lsp = DtMs(self.0 - msp.0);
+        (msp, lsp)
+    }
 }

 impl std::ops::Sub for TsMs {
@@ -2713,6 +2797,7 @@ pub trait HasBackend {

 pub trait HasTimeout {
    fn timeout(&self) -> Duration;
+    fn set_timeout(&mut self, timeout: Duration);
 }

 pub trait FromUrl: Sized {
@@ -2748,7 +2833,12 @@ impl HasBackend for ChannelConfigQuery {

 impl HasTimeout for ChannelConfigQuery {
    fn timeout(&self) -> Duration {
-        Duration::from_millis(2000)
+        Duration::from_millis(10000)
+    }
+
+    fn set_timeout(&mut self, timeout: Duration) {
+        // TODO
+        // self.timeout = Some(timeout);
    }
 }

--- a/crates/netpod/src/query.rs
+++ b/crates/netpod/src/query.rs
@@ -284,7 +284,12 @@ impl HasBackend for ChannelStateEventsQuery {

 impl HasTimeout for ChannelStateEventsQuery {
    fn timeout(&self) -> Duration {
-        Duration::from_millis(6000)
+        Duration::from_millis(10000)
+    }
+
+    fn set_timeout(&mut self, timeout: Duration) {
+        // TODO
+        // self.timeout = Some(timeout);
    }
 }

--- a/crates/netpod/src/ttl.rs
+++ b/crates/netpod/src/ttl.rs
@@ -1,3 +1,5 @@
+use std::time::Duration;
+
 #[derive(Debug, Clone)]
 pub enum RetentionTime {
    Short,
@@ -14,4 +16,33 @@ impl RetentionTime {
            Long => "lt_",
        }
    }
+
+    pub fn ttl_events_d0(&self) -> Duration {
+        match self {
+            RetentionTime::Short => Duration::from_secs(60 * 60 * 12),
+            RetentionTime::Medium => Duration::from_secs(60 * 60 * 24 * 100),
+            RetentionTime::Long => Duration::from_secs(60 * 60 * 24 * 31 * 12 * 11),
+        }
+    }
+
+    pub fn ttl_events_d1(&self) -> Duration {
+        match self {
+            RetentionTime::Short => Duration::from_secs(60 * 60 * 12),
+            RetentionTime::Medium => Duration::from_secs(60 * 60 * 24 * 100),
+            RetentionTime::Long => Duration::from_secs(60 * 60 * 24 * 31 * 12 * 11),
+        }
+    }
+
+    pub fn ttl_ts_msp(&self) -> Duration {
+        let dt = self.ttl_events_d0();
+        dt + dt / 30
+    }
+
+    pub fn ttl_binned(&self) -> Duration {
+        self.ttl_events_d0() * 2
+    }
+
+    pub fn ttl_channel_status(&self) -> Duration {
+        self.ttl_binned()
+    }
 }
--- a/crates/query/src/api4.rs
+++ b/crates/query/src/api4.rs
@@ -1,6 +1,9 @@
 pub mod binned;
 pub mod events;

+use chrono::DateTime;
+use chrono::TimeZone;
+use chrono::Utc;
 use err::Error;
 use netpod::get_url_query_pairs;
 use netpod::range::evrange::SeriesRange;
@@ -8,6 +11,9 @@ use netpod::AppendToUrl;
 use netpod::FromUrl;
 use netpod::HasBackend;
 use netpod::HasTimeout;
+use netpod::ToNanos;
+use netpod::TsNano;
+use netpod::DATETIME_FMT_6MS;
 use serde::Deserialize;
 use serde::Serialize;
 use std::collections::BTreeMap;
@@ -34,7 +40,12 @@ impl HasBackend for AccountingIngestedBytesQuery {

 impl HasTimeout for AccountingIngestedBytesQuery {
    fn timeout(&self) -> Duration {
-        Duration::from_millis(5000)
+        Duration::from_millis(10000)
+    }
+
+    fn set_timeout(&mut self, timeout: Duration) {
+        // TODO
+        // self.timeout = Some(timeout);
    }
 }

@@ -65,3 +76,77 @@ impl AppendToUrl for AccountingIngestedBytesQuery {
        self.range.append_to_url(url);
    }
 }
+
+//
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AccountingToplistQuery {
+    backend: String,
+    ts: TsNano,
+    limit: u32,
+}
+
+impl AccountingToplistQuery {
+    pub fn ts(&self) -> TsNano {
+        self.ts.clone()
+    }
+
+    pub fn limit(&self) -> u32 {
+        self.limit
+    }
+}
+
+impl HasBackend for AccountingToplistQuery {
+    fn backend(&self) -> &str {
+        &self.backend
+    }
+}
+
+impl HasTimeout for AccountingToplistQuery {
+    fn timeout(&self) -> Duration {
+        Duration::from_millis(10000)
+    }
+
+    fn set_timeout(&mut self, timeout: Duration) {
+        // TODO
+        // self.timeout = Some(timeout);
+    }
+}
+
+impl FromUrl for AccountingToplistQuery {
+    fn from_url(url: &Url) -> Result<Self, err::Error> {
+        let pairs = get_url_query_pairs(url);
+        Self::from_pairs(&pairs)
+    }
+
+    fn from_pairs(pairs: &BTreeMap<String, String>) -> Result<Self, Error> {
+        let fn1 = |pairs: &BTreeMap<String, String>| {
+            let v = pairs.get("tsDate").ok_or(Error::with_public_msg("missing tsDate"))?;
+            let w = v.parse::<DateTime<Utc>>()?;
+            Ok::<_, Error>(TsNano(w.to_nanos()))
+        };
+        let ret = Self {
+            backend: pairs
+                .get("backend")
+                .ok_or_else(|| Error::with_msg_no_trace("missing backend"))?
+                .to_string(),
+            ts: fn1(pairs)?,
+            limit: pairs.get("limit").map_or(None, |x| x.parse().ok()).unwrap_or(20),
+        };
+        Ok(ret)
+    }
+}
+
+impl AppendToUrl for AccountingToplistQuery {
+    fn append_to_url(&self, url: &mut Url) {
+        let mut g = url.query_pairs_mut();
+        g.append_pair("backend", &self.backend);
+        g.append_pair(
+            "ts",
+            &Utc.timestamp_nanos(self.ts.ns() as i64)
+                .format(DATETIME_FMT_6MS)
+                .to_string(),
+        );
+        g.append_pair("limit", &self.limit.to_string());
+    }
+}
--- a/crates/query/src/api4/binned.rs
+++ b/crates/query/src/api4/binned.rs
@@ -160,6 +160,10 @@ impl HasTimeout for BinnedQuery {
    fn timeout(&self) -> Duration {
        self.timeout_value()
    }
+
+    fn set_timeout(&mut self, timeout: Duration) {
+        self.timeout = Some(timeout);
+    }
 }

 impl FromUrl for BinnedQuery {
--- a/crates/query/src/api4/events.rs
+++ b/crates/query/src/api4/events.rs
@@ -208,6 +208,10 @@ impl HasTimeout for PlainEventsQuery {
    fn timeout(&self) -> Duration {
        self.timeout()
    }
+
+    fn set_timeout(&mut self, timeout: Duration) {
+        self.timeout = Some(timeout);
+    }
 }

 impl FromUrl for PlainEventsQuery {
--- a/crates/scyllaconn/src/accounting.rs
+++ b/crates/scyllaconn/src/accounting.rs
@@ -1,233 +1,2 @@
-use crate::errconv::ErrConv;
-use err::Error;
-use futures_util::Future;
-use futures_util::FutureExt;
-use futures_util::Stream;
-use futures_util::StreamExt;
-use items_0::Empty;
-use items_0::Extendable;
-use items_0::WithLen;
-use items_2::accounting::AccountingEvents;
-use netpod::log::*;
-use netpod::range::evrange::NanoRange;
-use netpod::timeunits;
-use netpod::EMIT_ACCOUNTING_SNAP;
-use scylla::prepared_statement::PreparedStatement;
-use scylla::Session as ScySession;
-use std::collections::VecDeque;
-use std::pin::Pin;
-use std::sync::Arc;
-use std::task::Context;
-use std::task::Poll;
-
-async fn read_next(
-    ts_msp: u64,
-    fwd: bool,
-    qu: PreparedStatement,
-    scy: Arc<ScySession>,
-) -> Result<AccountingEvents, Error> {
-    type RowType = (i64, i64, i64);
-    let mut ret = AccountingEvents::empty();
-    let mut tot_count = 0;
-    let mut tot_bytes = 0;
-    for part in 0..255_u32 {
-        let mut res = if fwd {
-            scy.execute_iter(qu.clone(), (part as i32, ts_msp as i64))
-                .await
-                .err_conv()?
-                .into_typed::<RowType>()
-        } else {
-            return Err(Error::with_msg_no_trace("no backward support"));
-        };
-        while let Some(row) = res.next().await {
-            let row = row.map_err(Error::from_string)?;
-            let _ts = ts_msp;
-            let _series = row.0 as u64;
-            let count = row.1 as u64;
-            let bytes = row.2 as u64;
-            tot_count += count;
-            tot_bytes += bytes;
-        }
-    }
-    ret.tss.push_back(ts_msp);
-    ret.count.push_back(tot_count);
-    ret.bytes.push_back(tot_bytes);
-    Ok(ret)
-}
-
-struct ReadValues {
-    #[allow(unused)]
-    range: NanoRange,
-    ts_msps: VecDeque<u64>,
-    fwd: bool,
-    #[allow(unused)]
-    do_one_before_range: bool,
-    fut: Pin<Box<dyn Future<Output = Result<AccountingEvents, Error>> + Send>>,
-    scy: Arc<ScySession>,
-    qu: PreparedStatement,
-}
-
-impl ReadValues {
-    fn new(
-        range: NanoRange,
-        ts_msps: VecDeque<u64>,
-        fwd: bool,
-        do_one_before_range: bool,
-        scy: Arc<ScySession>,
-        qu: PreparedStatement,
-    ) -> Self {
-        let mut ret = Self {
-            range,
-            ts_msps,
-            fwd,
-            do_one_before_range,
-            fut: Box::pin(futures_util::future::ready(Err(Error::with_msg_no_trace(
-                "future not initialized",
-            )))),
-            scy,
-            qu,
-        };
-        ret.next();
-        ret
-    }
-
-    fn next(&mut self) -> bool {
-        if let Some(ts_msp) = self.ts_msps.pop_front() {
-            self.fut = self.make_fut(ts_msp);
-            true
-        } else {
-            false
-        }
-    }
-
-    fn make_fut(&mut self, ts_msp: u64) -> Pin<Box<dyn Future<Output = Result<AccountingEvents, Error>> + Send>> {
-        let fut = read_next(ts_msp, self.fwd, self.qu.clone(), self.scy.clone());
-        Box::pin(fut)
-    }
-}
-
-enum FrState {
-    New,
-    Prepare(PrepFut),
-    Start,
-    ReadValues(ReadValues),
-    Done,
-}
-
-type PrepFut = Pin<Box<dyn Future<Output = Result<PreparedStatement, Error>> + Send>>;
-
-pub struct AccountingStreamScylla {
-    state: FrState,
-    range: NanoRange,
-    scy: Arc<ScySession>,
-    qu_select: Option<PreparedStatement>,
-    outbuf: AccountingEvents,
-    poll_count: u32,
-}
-
-impl AccountingStreamScylla {
-    pub fn new(range: NanoRange, scy: Arc<ScySession>) -> Self {
-        Self {
-            state: FrState::New,
-            range,
-            scy,
-            qu_select: None,
-            outbuf: AccountingEvents::empty(),
-            poll_count: 0,
-        }
-    }
-}
-
-async fn prep(cql: &str, scy: Arc<ScySession>) -> Result<PreparedStatement, Error> {
-    scy.prepare(cql)
-        .await
-        .map_err(|e| Error::with_msg_no_trace(format!("cql error {e}")))
-}
-
-impl Stream for AccountingStreamScylla {
-    type Item = Result<AccountingEvents, Error>;
-
-    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
-        use Poll::*;
-        // debug!("poll {}", self.poll_count);
-        self.poll_count += 1;
-        if self.poll_count > 200000 {
-            debug!("abort high poll count");
-            return Ready(None);
-        }
-        let span = tracing::span!(tracing::Level::TRACE, "poll_next");
-        let _spg = span.enter();
-        loop {
-            if self.outbuf.len() > 0 {
-                let item = std::mem::replace(&mut self.outbuf, AccountingEvents::empty());
-                break Ready(Some(Ok(item)));
-            }
-            break match &mut self.state {
-                FrState::New => {
-                    let cql = concat!("select series, count, bytes from account_00 where part = ? and ts = ?");
-                    let fut = prep(cql, self.scy.clone());
-                    let fut: PrepFut = Box::pin(fut);
-                    self.state = FrState::Prepare(fut);
-                    continue;
-                }
-                FrState::Prepare(fut) => match fut.poll_unpin(cx) {
-                    Ready(Ok(x)) => {
-                        self.qu_select = Some(x);
-                        self.state = FrState::Start;
-                        continue;
-                    }
-                    Ready(Err(e)) => {
-                        error!("{e}");
-                        Ready(Some(Err(Error::with_msg_no_trace("cql error"))))
-                    }
-                    Pending => Pending,
-                },
-                FrState::Start => {
-                    let mut ts_msps = VecDeque::new();
-                    let mut ts = self.range.beg / timeunits::SEC / EMIT_ACCOUNTING_SNAP * EMIT_ACCOUNTING_SNAP;
-                    let ts_e = self.range.end / timeunits::SEC / EMIT_ACCOUNTING_SNAP * EMIT_ACCOUNTING_SNAP;
-                    while ts < ts_e {
-                        if ts_msps.len() >= 100 {
-                            debug!("too large time range requested");
-                            break;
-                        }
-                        ts_msps.push_back(ts);
-                        ts += EMIT_ACCOUNTING_SNAP;
-                    }
-                    if ts_msps.len() == 0 {
-                        self.state = FrState::Done;
-                        continue;
-                    } else {
-                        let fwd = true;
-                        let do_one_before_range = false;
-                        let st = ReadValues::new(
-                            self.range.clone(),
-                            ts_msps,
-                            fwd,
-                            do_one_before_range,
-                            self.scy.clone(),
-                            self.qu_select.as_ref().unwrap().clone(),
-                        );
-                        self.state = FrState::ReadValues(st);
-                        continue;
-                    }
-                }
-                FrState::ReadValues(ref mut st) => match st.fut.poll_unpin(cx) {
-                    Ready(Ok(mut item)) => {
-                        if !st.next() {
-                            self.state = FrState::Done;
-                        }
-                        self.outbuf.extend_from(&mut item);
-                        continue;
-                    }
-                    Ready(Err(e)) => {
-                        error!("{e}");
-                        Ready(Some(Err(e)))
-                    }
-                    Pending => Pending,
-                },
-                FrState::Done => Ready(None),
-            };
-        }
-    }
-}
+pub mod toplist;
+pub mod totals;
--- a/crates/scyllaconn/src/accounting/toplist.rs
+++ b/crates/scyllaconn/src/accounting/toplist.rs
@@ -0,0 +1,75 @@
+use crate::errconv::ErrConv;
+use err::Error;
+use futures_util::StreamExt;
+use netpod::log::*;
+use netpod::timeunits;
+use netpod::EMIT_ACCOUNTING_SNAP;
+use scylla::prepared_statement::PreparedStatement;
+use scylla::Session as ScySession;
+use std::sync::Arc;
+
+#[derive(Debug)]
+pub struct UsageData {
+    ts: u64,
+    // (series, count, bytes)
+    usage: Vec<(u64, u64, u64)>,
+}
+
+impl UsageData {
+    pub fn new(ts: u64) -> Self {
+        Self { ts, usage: Vec::new() }
+    }
+
+    pub fn ts(&self) -> u64 {
+        self.ts
+    }
+
+    pub fn usage(&self) -> &[(u64, u64, u64)] {
+        &self.usage
+    }
+
+    pub fn sort_by_counts(&mut self) {
+        self.usage.sort_unstable_by(|a, b| b.1.cmp(&a.1))
+    }
+
+    pub fn sort_by_bytes(&mut self) {
+        self.usage.sort_unstable_by(|a, b| b.2.cmp(&a.2))
+    }
+}
+
+pub async fn read_ts(ts: u64, scy: Arc<ScySession>) -> Result<UsageData, Error> {
+    // TODO  toplist::read_ts  refactor
+    info!("TODO  toplist::read_ts  refactor");
+    let snap = EMIT_ACCOUNTING_SNAP.ms() / 1000;
+    let ts = ts / timeunits::SEC / snap * snap;
+    let cql = concat!("select series, count, bytes from account_00 where part = ? and ts = ?");
+    let qu = prep(cql, scy.clone()).await?;
+    let ret = read_ts_inner(ts, qu, scy).await?;
+    Ok(ret)
+}
+
+async fn read_ts_inner(ts: u64, qu: PreparedStatement, scy: Arc<ScySession>) -> Result<UsageData, Error> {
+    type RowType = (i64, i64, i64);
+    let mut ret = UsageData::new(ts);
+    for part in 0..255_u32 {
+        let mut res = scy
+            .execute_iter(qu.clone(), (part as i32, ts as i64))
+            .await
+            .err_conv()?
+            .into_typed::<RowType>();
+        while let Some(row) = res.next().await {
+            let row = row.map_err(Error::from_string)?;
+            let series = row.0 as u64;
+            let count = row.1 as u64;
+            let bytes = row.2 as u64;
+            ret.usage.push((series, count, bytes));
+        }
+    }
+    Ok(ret)
+}
+
+async fn prep(cql: &str, scy: Arc<ScySession>) -> Result<PreparedStatement, Error> {
+    scy.prepare(cql)
+        .await
+        .map_err(|e| Error::with_msg_no_trace(format!("cql error {e}")))
+}
--- a/crates/scyllaconn/src/accounting/totals.rs
+++ b/crates/scyllaconn/src/accounting/totals.rs
@@ -0,0 +1,234 @@
+use crate::errconv::ErrConv;
+use err::Error;
+use futures_util::Future;
+use futures_util::FutureExt;
+use futures_util::Stream;
+use futures_util::StreamExt;
+use items_0::Empty;
+use items_0::Extendable;
+use items_0::WithLen;
+use items_2::accounting::AccountingEvents;
+use netpod::log::*;
+use netpod::range::evrange::NanoRange;
+use netpod::timeunits;
+use netpod::EMIT_ACCOUNTING_SNAP;
+use scylla::prepared_statement::PreparedStatement;
+use scylla::Session as ScySession;
+use std::collections::VecDeque;
+use std::pin::Pin;
+use std::sync::Arc;
+use std::task::Context;
+use std::task::Poll;
+
+async fn read_next(
+    ts_msp: u64,
+    fwd: bool,
+    qu: PreparedStatement,
+    scy: Arc<ScySession>,
+) -> Result<AccountingEvents, Error> {
+    type RowType = (i64, i64, i64);
+    let mut ret = AccountingEvents::empty();
+    let mut tot_count = 0;
+    let mut tot_bytes = 0;
+    for part in 0..255_u32 {
+        let mut res = if fwd {
+            scy.execute_iter(qu.clone(), (part as i32, ts_msp as i64))
+                .await
+                .err_conv()?
+                .into_typed::<RowType>()
+        } else {
+            return Err(Error::with_msg_no_trace("no backward support"));
+        };
+        while let Some(row) = res.next().await {
+            let row = row.map_err(Error::from_string)?;
+            let _ts = ts_msp;
+            let _series = row.0 as u64;
+            let count = row.1 as u64;
+            let bytes = row.2 as u64;
+            tot_count += count;
+            tot_bytes += bytes;
+        }
+    }
+    ret.tss.push_back(ts_msp);
+    ret.count.push_back(tot_count);
+    ret.bytes.push_back(tot_bytes);
+    Ok(ret)
+}
+
+struct ReadValues {
+    #[allow(unused)]
+    range: NanoRange,
+    ts_msps: VecDeque<u64>,
+    fwd: bool,
+    #[allow(unused)]
+    do_one_before_range: bool,
+    fut: Pin<Box<dyn Future<Output = Result<AccountingEvents, Error>> + Send>>,
+    scy: Arc<ScySession>,
+    qu: PreparedStatement,
+}
+
+impl ReadValues {
+    fn new(
+        range: NanoRange,
+        ts_msps: VecDeque<u64>,
+        fwd: bool,
+        do_one_before_range: bool,
+        scy: Arc<ScySession>,
+        qu: PreparedStatement,
+    ) -> Self {
+        let mut ret = Self {
+            range,
+            ts_msps,
+            fwd,
+            do_one_before_range,
+            fut: Box::pin(futures_util::future::ready(Err(Error::with_msg_no_trace(
+                "future not initialized",
+            )))),
+            scy,
+            qu,
+        };
+        ret.next();
+        ret
+    }
+
+    fn next(&mut self) -> bool {
+        if let Some(ts_msp) = self.ts_msps.pop_front() {
+            self.fut = self.make_fut(ts_msp);
+            true
+        } else {
+            false
+        }
+    }
+
+    fn make_fut(&mut self, ts_msp: u64) -> Pin<Box<dyn Future<Output = Result<AccountingEvents, Error>> + Send>> {
+        let fut = read_next(ts_msp, self.fwd, self.qu.clone(), self.scy.clone());
+        Box::pin(fut)
+    }
+}
+
+enum FrState {
+    New,
+    Prepare(PrepFut),
+    Start,
+    ReadValues(ReadValues),
+    Done,
+}
+
+type PrepFut = Pin<Box<dyn Future<Output = Result<PreparedStatement, Error>> + Send>>;
+
+pub struct AccountingStreamScylla {
+    state: FrState,
+    range: NanoRange,
+    scy: Arc<ScySession>,
+    qu_select: Option<PreparedStatement>,
+    outbuf: AccountingEvents,
+    poll_count: u32,
+}
+
+impl AccountingStreamScylla {
+    pub fn new(range: NanoRange, scy: Arc<ScySession>) -> Self {
+        Self {
+            state: FrState::New,
+            range,
+            scy,
+            qu_select: None,
+            outbuf: AccountingEvents::empty(),
+            poll_count: 0,
+        }
+    }
+}
+
+async fn prep(cql: &str, scy: Arc<ScySession>) -> Result<PreparedStatement, Error> {
+    scy.prepare(cql)
+        .await
+        .map_err(|e| Error::with_msg_no_trace(format!("cql error {e}")))
+}
+
+impl Stream for AccountingStreamScylla {
+    type Item = Result<AccountingEvents, Error>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+        use Poll::*;
+        // debug!("poll {}", self.poll_count);
+        self.poll_count += 1;
+        if self.poll_count > 200000 {
+            debug!("abort high poll count");
+            return Ready(None);
+        }
+        let span = tracing::span!(tracing::Level::TRACE, "poll_next");
+        let _spg = span.enter();
+        loop {
+            if self.outbuf.len() > 0 {
+                let item = std::mem::replace(&mut self.outbuf, AccountingEvents::empty());
+                break Ready(Some(Ok(item)));
+            }
+            break match &mut self.state {
+                FrState::New => {
+                    let cql = concat!("select series, count, bytes from account_00 where part = ? and ts = ?");
+                    let fut = prep(cql, self.scy.clone());
+                    let fut: PrepFut = Box::pin(fut);
+                    self.state = FrState::Prepare(fut);
+                    continue;
+                }
+                FrState::Prepare(fut) => match fut.poll_unpin(cx) {
+                    Ready(Ok(x)) => {
+                        self.qu_select = Some(x);
+                        self.state = FrState::Start;
+                        continue;
+                    }
+                    Ready(Err(e)) => {
+                        error!("{e}");
+                        Ready(Some(Err(Error::with_msg_no_trace("cql error"))))
+                    }
+                    Pending => Pending,
+                },
+                FrState::Start => {
+                    let mut ts_msps = VecDeque::new();
+                    let snap = EMIT_ACCOUNTING_SNAP.ms() / 1000;
+                    let mut ts = self.range.beg / timeunits::SEC / snap * snap;
+                    let ts_e = self.range.end / timeunits::SEC / snap * snap;
+                    while ts < ts_e {
+                        if ts_msps.len() >= 100 {
+                            debug!("too large time range requested");
+                            break;
+                        }
+                        ts_msps.push_back(ts);
+                        ts += snap;
+                    }
+                    if ts_msps.len() == 0 {
+                        self.state = FrState::Done;
+                        continue;
+                    } else {
+                        let fwd = true;
+                        let do_one_before_range = false;
+                        let st = ReadValues::new(
+                            self.range.clone(),
+                            ts_msps,
+                            fwd,
+                            do_one_before_range,
+                            self.scy.clone(),
+                            self.qu_select.as_ref().unwrap().clone(),
+                        );
+                        self.state = FrState::ReadValues(st);
+                        continue;
+                    }
+                }
+                FrState::ReadValues(ref mut st) => match st.fut.poll_unpin(cx) {
+                    Ready(Ok(mut item)) => {
+                        if !st.next() {
+                            self.state = FrState::Done;
+                        }
+                        self.outbuf.extend_from(&mut item);
+                        continue;
+                    }
+                    Ready(Err(e)) => {
+                        error!("{e}");
+                        Ready(Some(Err(e)))
+                    }
+                    Pending => Pending,
+                },
+                FrState::Done => Ready(None),
+            };
+        }
+    }
+}
--- a/crates/scyllaconn/src/status.rs
+++ b/crates/scyllaconn/src/status.rs
@@ -205,11 +205,12 @@ impl Stream for StatusStreamScylla {
            break match self.state {
                FrState::New => {
                    let mut ts_msps = VecDeque::new();
-                    let mut ts = self.range.beg / CONNECTION_STATUS_DIV * CONNECTION_STATUS_DIV;
+                    let snap = CONNECTION_STATUS_DIV.ms() * 1000000;
+                    let mut ts = self.range.beg / snap * snap;
                    while ts < self.range.end {
                        debug!("Use ts {ts}");
                        ts_msps.push_back(ts);
-                        ts += CONNECTION_STATUS_DIV;
+                        ts += snap;
                    }
                    let st = ReadValues::new(
                        self.series,
--- a/crates/streams/Cargo.toml
+++ b/crates/streams/Cargo.toml
@@ -19,7 +19,7 @@ crc32fast = "1.3.2"
 byteorder = "1.4.3"
 async-channel = "1.8.0"
 chrono = { version = "0.4.19", features = ["serde"] }
-wasmer = { version = "4.1.0", default-features = false, features = ["sys", "cranelift"] }
+wasmer = { version = "4.1.0", default-features = false, features = ["sys", "cranelift"], optional = true }
 err = { path = "../err" }
 netpod = { path = "../netpod" }
 query = { path = "../query" }
@@ -30,3 +30,6 @@ httpclient = { path = "../httpclient" }

 [dev-dependencies]
 taskrun = { path = "../taskrun" }
+
+[features]
+wasm_transform = ["wasmer"]
--- a/crates/streams/src/cbor.rs
+++ b/crates/streams/src/cbor.rs
@@ -23,6 +23,9 @@ use std::pin::Pin;
 use std::task::Context;
 use std::task::Poll;

+const FRAME_HEAD_LEN: usize = 16;
+const FRAME_PAYLOAD_MAX: u32 = 1024 * 1024 * 80;
+
 trait ErrConv<T> {
    fn ec(self) -> Result<T, Error>;
 }
@@ -62,6 +65,7 @@ impl From<CborBytes> for Bytes {

 pub type CborStream = Pin<Box<dyn Stream<Item = Result<CborBytes, Error>> + Send>>;

+// TODO move this type decl because it is not specific to cbor
 pub type SitemtyDynEventsStream =
    Pin<Box<dyn Stream<Item = Result<StreamItem<RangeCompletableItem<Box<dyn Events>>>, Error>> + Send>>;

@@ -143,29 +147,36 @@ impl<S> FramedBytesToSitemtyDynEventsStream<S> {
            inp,
            scalar_type,
            shape,
-            buf: BytesMut::with_capacity(1024 * 64),
+            buf: BytesMut::with_capacity(1024 * 256),
        }
    }

    fn try_parse(&mut self) -> Result<Option<Sitemty<Box<dyn Events>>>, Error> {
        // debug!("try_parse {}", self.buf.len());
-        if self.buf.len() < 4 {
+        if self.buf.len() < FRAME_HEAD_LEN {
            return Ok(None);
        }
        let n = u32::from_le_bytes(self.buf[..4].try_into()?);
-        if n > 1024 * 1024 * 40 {
+        if n > FRAME_PAYLOAD_MAX {
            let e = Error::with_msg_no_trace(format!("frame too large {n}"));
            error!("{e}");
            return Err(e);
        }
-        if self.buf.len() < 4 + n as usize {
+        let frame_len = FRAME_HEAD_LEN + n as usize;
+        let adv = (frame_len + 7) / 8 * 8;
+        assert!(adv % 8 == 0);
+        assert!(adv >= frame_len);
+        assert!(adv < 8 + frame_len);
+        if self.buf.len() < adv {
            // debug!("not enough  {}  {}", n, self.buf.len());
            return Ok(None);
        }
-        let buf = &self.buf[4..4 + n as usize];
+        let buf = &self.buf[FRAME_HEAD_LEN..frame_len];
        let val: ciborium::Value = ciborium::from_reader(std::io::Cursor::new(buf)).map_err(Error::from_string)?;
        // debug!("decoded ciborium value {val:?}");
        let item = if let Some(map) = val.as_map() {
+            let keys: Vec<&str> = map.iter().map(|k| k.0.as_text().unwrap_or("(none)")).collect();
+            debug!("keys {keys:?}");
            if let Some(x) = map.get(0) {
                if let Some(y) = x.0.as_text() {
                    if y == "rangeFinal" {
@@ -196,9 +207,10 @@ impl<S> FramedBytesToSitemtyDynEventsStream<S> {
            Some(x)
        } else {
            let item = decode_cbor_to_box_events(buf, &self.scalar_type, &self.shape)?;
+            debug!("decoded boxed events  len {}", item.len());
            Some(StreamItem::DataItem(RangeCompletableItem::Data(item)))
        };
-        self.buf.advance(4 + n as usize);
+        self.buf.advance(adv);
        if let Some(x) = item {
            Ok(Some(Ok(x)))
        } else {
--- a/crates/streams/src/firsterr.rs
+++ b/crates/streams/src/firsterr.rs
@@ -2,8 +2,22 @@ use crate::cbor::CborBytes;
 use futures_util::future;
 use futures_util::Stream;
 use futures_util::StreamExt;
+use items_0::WithLen;

-pub fn non_empty<S, E>(inp: S) -> impl Stream<Item = Result<CborBytes, E>>
+pub fn non_empty<S, T, E>(inp: S) -> impl Stream<Item = Result<T, E>>
+where
+    S: Stream<Item = Result<T, E>>,
+    T: WithLen,
+{
+    inp.filter(|x| {
+        future::ready(match x {
+            Ok(x) => x.len() > 0,
+            Err(_) => true,
+        })
+    })
+}
+
+pub fn non_empty_nongen<S, E>(inp: S) -> impl Stream<Item = Result<CborBytes, E>>
 where
    S: Stream<Item = Result<CborBytes, E>>,
 {
--- a/crates/streams/src/generators.rs
+++ b/crates/streams/src/generators.rs
@@ -420,3 +420,114 @@ impl Stream for GenerateF64V00 {
        }
    }
 }
+
+pub struct GenerateWaveI16V00 {
+    ivl: u64,
+    ts: u64,
+    dts: u64,
+    tsend: u64,
+    node_ix: u64,
+    timeout: Option<Pin<Box<dyn Future<Output = ()> + Send>>>,
+    do_throttle: bool,
+    done: bool,
+    done_range_final: bool,
+}
+
+impl GenerateWaveI16V00 {
+    pub fn self_name() -> &'static str {
+        std::any::type_name::<Self>()
+    }
+
+    pub fn new(node_ix: u64, node_count: u64, range: SeriesRange, one_before_range: bool) -> Self {
+        let range = match range {
+            SeriesRange::TimeRange(k) => k,
+            SeriesRange::PulseRange(_) => todo!(),
+        };
+        let ivl = MS * 100;
+        let dts = ivl * node_count as u64;
+        let ts = (range.beg / ivl + node_ix - if one_before_range { 1 } else { 0 }) * ivl;
+        let tsend = range.end;
+        debug!(
+            "{}::new  ivl {}  dts {}  ts {}  one_before_range {}",
+            Self::self_name(),
+            ivl,
+            dts,
+            ts,
+            one_before_range
+        );
+        Self {
+            ivl,
+            ts,
+            dts,
+            tsend,
+            node_ix,
+            timeout: None,
+            do_throttle: false,
+            done: false,
+            done_range_final: false,
+        }
+    }
+
+    fn make_batch(&mut self) -> Sitemty<ChannelEvents> {
+        type T = i16;
+        let mut item = EventsDim1::empty();
+        let mut ts = self.ts;
+        loop {
+            if self.ts >= self.tsend || item.byte_estimate() > 1024 * 20 {
+                break;
+            }
+            let pulse = ts;
+            let ampl = ((ts / self.ivl) as f32).sin() + 2.;
+            let mut value = Vec::new();
+            let pi = std::f32::consts::PI;
+            for i in 0..21 {
+                let x = ((-pi + (2. * pi / 20.) * i as f32).cos() + 1.1) * ampl;
+                value.push(x as T);
+            }
+            if false {
+                info!(
+                    "v01  node {}  made event  ts {}  pulse {}  value {:?}",
+                    self.node_ix, ts, pulse, value
+                );
+            }
+            item.push(ts, pulse, value);
+            ts += self.dts;
+        }
+        self.ts = ts;
+        trace!("generated  len {}", item.len());
+        let w = ChannelEvents::Events(Box::new(item) as _);
+        let w = sitem_data(w);
+        w
+    }
+}
+
+impl Stream for GenerateWaveI16V00 {
+    type Item = Sitemty<ChannelEvents>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+        use Poll::*;
+        loop {
+            break if self.done {
+                Ready(None)
+            } else if self.ts >= self.tsend {
+                self.done = true;
+                self.done_range_final = true;
+                Ready(Some(Ok(StreamItem::DataItem(RangeCompletableItem::RangeComplete))))
+            } else if !self.do_throttle {
+                // To use the generator without throttling, use this scope
+                Ready(Some(self.make_batch()))
+            } else if let Some(fut) = self.timeout.as_mut() {
+                match fut.poll_unpin(cx) {
+                    Ready(()) => {
+                        self.timeout = None;
+                        Ready(Some(self.make_batch()))
+                    }
+                    Pending => Pending,
+                }
+            } else {
+                self.timeout = Some(Box::pin(tokio::time::sleep(Duration::from_millis(2))));
+                continue;
+            };
+        }
+    }
+}
--- a/crates/streams/src/json_stream.rs
+++ b/crates/streams/src/json_stream.rs
@@ -0,0 +1,80 @@
+use crate::cbor::SitemtyDynEventsStream;
+use bytes::Bytes;
+use err::Error;
+use futures_util::Stream;
+use futures_util::StreamExt;
+use items_0::streamitem::RangeCompletableItem;
+use items_0::streamitem::StreamItem;
+use items_0::WithLen;
+use netpod::log::*;
+use std::pin::Pin;
+
+pub struct JsonBytes(Bytes);
+
+impl JsonBytes {
+    pub fn into_inner(self) -> Bytes {
+        self.0
+    }
+
+    pub fn len(&self) -> u32 {
+        self.0.len() as _
+    }
+}
+
+impl WithLen for JsonBytes {
+    fn len(&self) -> usize {
+        self.len() as usize
+    }
+}
+
+impl From<JsonBytes> for Bytes {
+    fn from(value: JsonBytes) -> Self {
+        value.0
+    }
+}
+
+pub type JsonStream = Pin<Box<dyn Stream<Item = Result<JsonBytes, Error>> + Send>>;
+
+pub fn events_stream_to_json_stream(stream: SitemtyDynEventsStream) -> impl Stream<Item = Result<JsonBytes, Error>> {
+    let stream = stream.map(|x| match x {
+        Ok(x) => match x {
+            StreamItem::DataItem(x) => match x {
+                RangeCompletableItem::Data(evs) => {
+                    let buf = evs.to_json_vec_u8();
+                    let bytes = Bytes::from(buf);
+                    let item = JsonBytes(bytes);
+                    Ok(item)
+                }
+                RangeCompletableItem::RangeComplete => {
+                    let item = serde_json::json!({
+                        "rangeFinal": true,
+                    });
+                    let buf = serde_json::to_vec(&item)?;
+                    let bytes = Bytes::from(buf);
+                    let item = JsonBytes(bytes);
+                    Ok(item)
+                }
+            },
+            StreamItem::Log(item) => {
+                info!("{item:?}");
+                let item = JsonBytes(Bytes::new());
+                Ok(item)
+            }
+            StreamItem::Stats(item) => {
+                info!("{item:?}");
+                let item = JsonBytes(Bytes::new());
+                Ok(item)
+            }
+        },
+        Err(e) => {
+            let item = serde_json::json!({
+                "error": e.to_string(),
+            });
+            let buf = serde_json::to_vec(&item)?;
+            let bytes = Bytes::from(buf);
+            let item = JsonBytes(bytes);
+            Ok(item)
+        }
+    });
+    stream
+}
--- a/crates/streams/src/lib.rs
+++ b/crates/streams/src/lib.rs
@@ -7,6 +7,7 @@ pub mod firsterr;
 pub mod frames;
 pub mod generators;
 pub mod itemclone;
+pub mod json_stream;
 pub mod lenframed;
 pub mod needminbuffer;
 pub mod plaineventscbor;
--- a/crates/streams/src/plaineventscbor.rs
+++ b/crates/streams/src/plaineventscbor.rs
@@ -10,12 +10,13 @@ use netpod::ChannelTypeConfigGen;
 use netpod::ReqCtx;
 use query::api4::events::PlainEventsQuery;

-pub async fn plain_events_cbor(
+pub async fn plain_events_cbor_stream(
    evq: &PlainEventsQuery,
    ch_conf: ChannelTypeConfigGen,
    ctx: &ReqCtx,
    open_bytes: OpenBoxedBytesStreamsBox,
 ) -> Result<CborStream, Error> {
+    trace!("build stream");
    let stream = dyn_events_stream(evq, ch_conf, ctx, open_bytes).await?;
    let stream = events_stream_to_cbor_stream(stream);
    let stream = non_empty(stream);
--- a/crates/streams/src/plaineventsjson.rs
+++ b/crates/streams/src/plaineventsjson.rs
@@ -1,4 +1,8 @@
 use crate::collect::Collect;
+use crate::firsterr::non_empty;
+use crate::firsterr::only_first_err;
+use crate::json_stream::events_stream_to_json_stream;
+use crate::json_stream::JsonStream;
 use crate::plaineventsstream::dyn_events_stream;
 use crate::tcprawclient::OpenBoxedBytesStreamsBox;
 use err::Error;
@@ -51,3 +55,17 @@ pub async fn plain_events_json(
    info!("plain_events_json  json serialized");
    Ok(jsval)
 }
+
+pub async fn plain_events_json_stream(
+    evq: &PlainEventsQuery,
+    ch_conf: ChannelTypeConfigGen,
+    ctx: &ReqCtx,
+    open_bytes: OpenBoxedBytesStreamsBox,
+) -> Result<JsonStream, Error> {
+    trace!("build stream");
+    let stream = dyn_events_stream(evq, ch_conf, ctx, open_bytes).await?;
+    let stream = events_stream_to_json_stream(stream);
+    let stream = non_empty(stream);
+    let stream = only_first_err(stream);
+    Ok(Box::pin(stream))
+}
--- a/crates/streams/src/plaineventsstream.rs
+++ b/crates/streams/src/plaineventsstream.rs
@@ -26,6 +26,7 @@ pub async fn dyn_events_stream(
    ctx: &ReqCtx,
    open_bytes: OpenBoxedBytesStreamsBox,
 ) -> Result<DynEventsStream, Error> {
+    trace!("dyn_events_stream begin");
    let subq = make_sub_query(
        ch_conf,
        evq.range().clone(),
@@ -78,6 +79,21 @@ pub async fn dyn_events_stream(
    }
 }

+#[cfg(not(wasm_transform))]
+async fn transform_wasm<INP>(
+    stream: INP,
+    _wasmname: &str,
+    _ctx: &ReqCtx,
+) -> Result<impl Stream<Item = Result<StreamItem<RangeCompletableItem<Box<dyn Events>>>, Error>> + Send, Error>
+where
+    INP: Stream<Item = Result<StreamItem<RangeCompletableItem<Box<dyn Events>>>, Error>> + Send + 'static,
+{
+    let ret: Pin<Box<dyn Stream<Item = Sitemty<Box<dyn Events>>> + Send>> = Box::pin(stream);
+    Ok(ret)
+}
+
+#[cfg(DISABLED)]
+#[cfg(wasm_transform)]
 async fn transform_wasm<INP>(
    stream: INP,
    wasmname: &str,
--- a/crates/streams/src/test/events.rs
+++ b/crates/streams/src/test/events.rs
@@ -2,7 +2,7 @@ use crate::cbor::FramedBytesToSitemtyDynEventsStream;
 use crate::firsterr::only_first_err;
 use crate::frames::inmem::BoxedBytesStream;
 use crate::lenframed;
-use crate::plaineventscbor::plain_events_cbor;
+use crate::plaineventscbor::plain_events_cbor_stream;
 use crate::tcprawclient::OpenBoxedBytesStreams;
 use crate::tcprawclient::TEST_BACKEND;
 use err::Error;
@@ -39,7 +39,7 @@ async fn merged_events_inner() -> Result<(), Error> {
    let evq = PlainEventsQuery::new(channel, range);
    let open_bytes = StreamOpener::new();
    let open_bytes = Box::pin(open_bytes);
-    let stream = plain_events_cbor(&evq, ch_conf.clone().into(), &ctx, open_bytes)
+    let stream = plain_events_cbor_stream(&evq, ch_conf.clone().into(), &ctx, open_bytes)
        .await
        .unwrap();
    let stream = lenframed::length_framed(stream);
--- a/crates/streams/src/timebinnedjson.rs
+++ b/crates/streams/src/timebinnedjson.rs
@@ -77,6 +77,8 @@ async fn timebinnable_stream(
        })
    });

+    #[cfg(DISABLED)]
+    #[cfg(wasm_transform)]
    let stream = if let Some(wasmname) = wasm1 {
        debug!("make wasm transform");
        use httpclient::url::Url;