commit a4719aeacce701535b5dd4cc21e86390585ff05d
Author: Dominik Werder <dominik.werder@gmail.com>
Date:   Fri Nov 8 09:16:54 2024 +0100

    Factored into separate crate

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1b72444
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/Cargo.lock
+/target
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..069d7db
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "daqbuf-query"
+version = "0.0.3"
+authors = ["Dominik Werder <dominik.werder@gmail.com>"]
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0.214", features = ["derive"] }
+serde_json = "1.0.132"
+tracing = "0.1.40"
+chrono = { version = "0.4.38", features = ["serde"] }
+url = "2.5.3"
+humantime = "2.1.0"
+humantime-serde = "1.1.1"
+thiserror = "=0.0.1"
+netpod = { path = "../daqbuf-netpod", package = "daqbuf-netpod" }
+
+[patch.crates-io]
+thiserror = { git = "https://github.com/dominikwerder/thiserror.git", branch = "cstm" }
diff --git a/src/api4.rs b/src/api4.rs
new file mode 100644
index 0000000..af0af7b
--- /dev/null
+++ b/src/api4.rs
@@ -0,0 +1,176 @@
+pub mod binned;
+pub mod events;
+
+use chrono::DateTime;
+use chrono::TimeZone;
+use chrono::Utc;
+use netpod::get_url_query_pairs;
+use netpod::range::evrange::SeriesRange;
+use netpod::ttl::RetentionTime;
+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;
+use std::time::Duration;
+use url::Url;
+
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "Query")]
+pub enum Error {
+    MissingTimerange,
+    ChronoParse(#[from] chrono::ParseError),
+    HumantimeDurationParse(#[from] humantime::DurationError),
+    MissingBackend,
+    MissingRetentionTime,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AccountingIngestedBytesQuery {
+    backend: String,
+    range: SeriesRange,
+}
+
+impl AccountingIngestedBytesQuery {
+    pub fn range(&self) -> &SeriesRange {
+        &self.range
+    }
+}
+
+impl HasBackend for AccountingIngestedBytesQuery {
+    fn backend(&self) -> &str {
+        &self.backend
+    }
+}
+
+impl HasTimeout for AccountingIngestedBytesQuery {
+    fn timeout(&self) -> Option<Duration> {
+        None
+    }
+}
+
+impl FromUrl for AccountingIngestedBytesQuery {
+    type Error = netpod::NetpodError;
+
+    fn from_url(url: &Url) -> Result<Self, Self::Error> {
+        let pairs = get_url_query_pairs(url);
+        Self::from_pairs(&pairs)
+    }
+
+    fn from_pairs(pairs: &BTreeMap<String, String>) -> Result<Self, Self::Error> {
+        let ret = Self {
+            backend: pairs
+                .get("backend")
+                .ok_or_else(|| netpod::NetpodError::MissingBackend)?
+                .to_string(),
+            range: SeriesRange::from_pairs(pairs)?,
+        };
+        Ok(ret)
+    }
+}
+
+impl AppendToUrl for AccountingIngestedBytesQuery {
+    fn append_to_url(&self, url: &mut Url) {
+        {
+            let mut g = url.query_pairs_mut();
+            g.append_pair("backend", &self.backend);
+        }
+        self.range.append_to_url(url);
+    }
+}
+
+//
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AccountingToplistQuery {
+    rt: RetentionTime,
+    backend: String,
+    ts: TsNano,
+    limit: u32,
+    sort: Option<String>,
+}
+
+impl AccountingToplistQuery {
+    pub fn rt(&self) -> RetentionTime {
+        self.rt.clone()
+    }
+
+    pub fn ts(&self) -> TsNano {
+        self.ts.clone()
+    }
+
+    pub fn limit(&self) -> u32 {
+        self.limit
+    }
+
+    pub fn sort(&self) -> Option<&str> {
+        self.sort.as_ref().map(|x| x.as_str())
+    }
+}
+
+impl HasBackend for AccountingToplistQuery {
+    fn backend(&self) -> &str {
+        &self.backend
+    }
+}
+
+impl HasTimeout for AccountingToplistQuery {
+    fn timeout(&self) -> Option<Duration> {
+        None
+    }
+}
+
+impl FromUrl for AccountingToplistQuery {
+    type Error = Error;
+
+    fn from_url(url: &Url) -> Result<Self, Self::Error> {
+        let pairs = get_url_query_pairs(url);
+        Self::from_pairs(&pairs)
+    }
+
+    fn from_pairs(pairs: &BTreeMap<String, String>) -> Result<Self, Self::Error> {
+        let fn1 = |pairs: &BTreeMap<String, String>| {
+            let v = pairs.get("tsDate").ok_or(Self::Error::MissingTimerange)?;
+            let mut w = v.parse::<DateTime<Utc>>();
+            if w.is_err() && v.ends_with("ago") {
+                let d = humantime::parse_duration(&v[..v.len() - 3])?;
+                w = Ok(Utc::now() - d);
+            }
+            let w = w?;
+            Ok::<_, Self::Error>(TsNano::from_ns(w.to_nanos()))
+        };
+        let ret = Self {
+            rt: pairs
+                .get("retentionTime")
+                .ok_or_else(|| Self::Error::MissingRetentionTime)
+                .and_then(|x| x.parse().map_err(|_| Self::Error::MissingRetentionTime))?,
+            backend: pairs
+                .get("backend")
+                .ok_or_else(|| Self::Error::MissingBackend)?
+                .to_string(),
+            ts: fn1(pairs)?,
+            limit: pairs.get("limit").map_or(None, |x| x.parse().ok()).unwrap_or(20),
+            sort: pairs.get("sort").map(ToString::to_string),
+        };
+        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());
+    }
+}
diff --git a/src/api4/binned.rs b/src/api4/binned.rs
new file mode 100644
index 0000000..f80f442
--- /dev/null
+++ b/src/api4/binned.rs
@@ -0,0 +1,384 @@
+use crate::transform::TransformQuery;
+use netpod::get_url_query_pairs;
+use netpod::log::*;
+use netpod::query::CacheUsage;
+use netpod::range::evrange::SeriesRange;
+use netpod::ttl::RetentionTime;
+use netpod::AppendToUrl;
+use netpod::BinnedRange;
+use netpod::BinnedRangeEnum;
+use netpod::ByteSize;
+use netpod::DtMs;
+use netpod::FromUrl;
+use netpod::HasBackend;
+use netpod::HasTimeout;
+use netpod::SfDbChannel;
+use serde::Deserialize;
+use serde::Serialize;
+use std::collections::BTreeMap;
+use std::time::Duration;
+use url::Url;
+
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "BinnedQuery")]
+pub enum Error {
+    BadInt(#[from] std::num::ParseIntError),
+    MultipleBinCountBinWidth,
+    BadUseRt,
+    Netpod(#[from] netpod::NetpodError),
+    Transform(#[from] crate::transform::Error),
+}
+
+mod serde_option_vec_duration {
+    use serde::Deserialize;
+    use serde::Deserializer;
+    use serde::Serialize;
+    use serde::Serializer;
+    use std::time::Duration;
+
+    #[derive(Debug, Clone, Serialize, Deserialize)]
+    struct HumantimeDuration {
+        #[serde(with = "humantime_serde")]
+        inner: Duration,
+    }
+
+    pub fn serialize<S>(val: &Option<Vec<Duration>>, ser: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match val {
+            Some(vec) => {
+                // humantime_serde::serialize(&t, ser)
+                let t: Vec<_> = vec.iter().map(|&x| HumantimeDuration { inner: x }).collect();
+                serde::Serialize::serialize(&t, ser)
+            }
+            None => ser.serialize_none(),
+        }
+    }
+
+    pub fn deserialize<'a, D>(de: D) -> Result<Option<Vec<Duration>>, D::Error>
+    where
+        D: Deserializer<'a>,
+    {
+        let t: Option<Vec<HumantimeDuration>> = serde::Deserialize::deserialize(de)?;
+        Ok(t.map(|v| v.iter().map(|x| x.inner).collect()))
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct BinnedQuery {
+    channel: SfDbChannel,
+    range: SeriesRange,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    bin_count: Option<u32>,
+    #[serde(default, skip_serializing_if = "Option::is_none", with = "humantime_serde")]
+    bin_width: Option<Duration>,
+    #[serde(
+        default = "TransformQuery::default_time_binned",
+        skip_serializing_if = "TransformQuery::is_default_time_binned"
+    )]
+    transform: TransformQuery,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    cache_usage: Option<CacheUsage>,
+    #[serde(default, skip_serializing_if = "Option::is_none", with = "serde_option_vec_duration")]
+    subgrids: Option<Vec<Duration>>,
+    #[serde(
+        default,
+        skip_serializing_if = "Option::is_none",
+        with = "humantime_serde",
+        rename = "contentTimeout"
+    )]
+    timeout_content: Option<Duration>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    buf_len_disk_io: Option<usize>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    disk_stats_every: Option<ByteSize>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub merger_out_len_max: Option<u32>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    scylla_read_queue_len: Option<u32>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    test_do_wasm: Option<String>,
+    #[serde(default)]
+    log_level: String,
+    #[serde(default)]
+    use_rt: Option<RetentionTime>,
+}
+
+impl BinnedQuery {
+    pub fn new(channel: SfDbChannel, range: SeriesRange, bin_count: u32) -> Self {
+        Self {
+            channel,
+            range,
+            bin_count: Some(bin_count),
+            bin_width: None,
+            transform: TransformQuery::default_time_binned(),
+            cache_usage: None,
+            subgrids: None,
+            buf_len_disk_io: None,
+            disk_stats_every: None,
+            timeout_content: None,
+            merger_out_len_max: None,
+            scylla_read_queue_len: None,
+            test_do_wasm: None,
+            log_level: String::new(),
+            use_rt: None,
+        }
+    }
+
+    pub fn range(&self) -> &SeriesRange {
+        &self.range
+    }
+
+    pub fn channel(&self) -> &SfDbChannel {
+        &self.channel
+    }
+
+    pub fn bin_count(&self) -> Option<u32> {
+        self.bin_count
+    }
+
+    pub fn bin_width(&self) -> Option<Duration> {
+        self.bin_width
+    }
+
+    pub fn transform(&self) -> &TransformQuery {
+        &self.transform
+    }
+
+    pub fn cache_usage(&self) -> Option<CacheUsage> {
+        self.cache_usage.clone()
+    }
+
+    pub fn disk_stats_every(&self) -> ByteSize {
+        match &self.disk_stats_every {
+            Some(x) => x.clone(),
+            None => ByteSize(1024 * 1024 * 4),
+        }
+    }
+
+    pub fn buf_len_disk_io(&self) -> usize {
+        match self.buf_len_disk_io {
+            Some(x) => x,
+            None => 1024 * 16,
+        }
+    }
+
+    pub fn timeout_content(&self) -> Option<Duration> {
+        self.timeout_content
+    }
+
+    pub fn subgrids(&self) -> Option<&[Duration]> {
+        self.subgrids.as_ref().map(|x| x.as_slice())
+    }
+
+    pub fn merger_out_len_max(&self) -> Option<u32> {
+        self.merger_out_len_max
+    }
+
+    pub fn scylla_read_queue_len(&self) -> Option<u32> {
+        self.scylla_read_queue_len
+    }
+
+    pub fn set_series_id(&mut self, series: u64) {
+        self.channel.set_series(series);
+    }
+
+    pub fn channel_mut(&mut self) -> &mut SfDbChannel {
+        &mut self.channel
+    }
+
+    pub fn set_cache_usage(&mut self, k: CacheUsage) {
+        self.cache_usage = Some(k);
+    }
+
+    pub fn set_disk_stats_every(&mut self, k: ByteSize) {
+        self.disk_stats_every = Some(k);
+    }
+
+    // Currently only for testing
+    pub fn set_timeout(&mut self, k: Duration) {
+        self.timeout_content = Some(k);
+    }
+
+    pub fn set_buf_len_disk_io(&mut self, k: usize) {
+        self.buf_len_disk_io = Some(k);
+    }
+
+    pub fn for_time_weighted_scalar(self) -> Self {
+        let mut v = self;
+        v.transform = TransformQuery::for_time_weighted_scalar();
+        v
+    }
+
+    pub fn test_do_wasm(&self) -> Option<&str> {
+        match &self.test_do_wasm {
+            Some(x) => Some(&x),
+            None => None,
+        }
+    }
+
+    pub fn log_level(&self) -> &str {
+        &self.log_level
+    }
+
+    pub fn use_rt(&self) -> Option<RetentionTime> {
+        self.use_rt.clone()
+    }
+
+    pub fn covering_range(&self) -> Result<BinnedRangeEnum, Error> {
+        match &self.range {
+            SeriesRange::TimeRange(range) => match self.bin_width {
+                Some(dt) => {
+                    if self.bin_count.is_some() {
+                        Err(Error::MultipleBinCountBinWidth)
+                    } else {
+                        let ret = BinnedRangeEnum::Time(BinnedRange::covering_range_time(
+                            range.clone(),
+                            DtMs::from_ms_u64(dt.as_millis() as u64),
+                        )?);
+                        Ok(ret)
+                    }
+                }
+                None => {
+                    let bc = self.bin_count.unwrap_or(20);
+                    let ret = BinnedRangeEnum::covering_range(self.range.clone(), bc)?;
+                    Ok(ret)
+                }
+            },
+            SeriesRange::PulseRange(_) => todo!(),
+        }
+    }
+}
+
+impl HasBackend for BinnedQuery {
+    fn backend(&self) -> &str {
+        self.channel.backend()
+    }
+}
+
+impl HasTimeout for BinnedQuery {
+    fn timeout(&self) -> Option<Duration> {
+        self.timeout_content
+    }
+}
+
+impl FromUrl for BinnedQuery {
+    type Error = Error;
+
+    fn from_url(url: &Url) -> Result<Self, Self::Error> {
+        let pairs = get_url_query_pairs(url);
+        Self::from_pairs(&pairs)
+    }
+
+    fn from_pairs(pairs: &BTreeMap<String, String>) -> Result<Self, Self::Error> {
+        let ret = Self {
+            channel: SfDbChannel::from_pairs(&pairs)?,
+            range: SeriesRange::from_pairs(pairs)?,
+            bin_count: pairs.get("binCount").and_then(|x| x.parse().ok()),
+            bin_width: pairs.get("binWidth").and_then(|x| humantime::parse_duration(x).ok()),
+            transform: TransformQuery::from_pairs(pairs)?,
+            cache_usage: CacheUsage::from_pairs(&pairs)?,
+            buf_len_disk_io: pairs
+                .get("bufLenDiskIo")
+                .map_or(Ok(None), |k| k.parse().map(|k| Some(k)))?,
+            disk_stats_every: pairs
+                .get("diskStatsEveryKb")
+                .map(|k| k.parse().ok())
+                .unwrap_or(None)
+                .map(ByteSize::from_kb),
+            /*report_error: pairs
+            .get("reportError")
+            .map_or("false", |k| k)
+            .parse()
+            .map_err(|e| Error::with_msg(format!("can not parse reportError {:?}", e)))?,*/
+            timeout_content: pairs
+                .get("contentTimeout")
+                .and_then(|x| humantime::parse_duration(x).ok()),
+            subgrids: pairs
+                .get("subgrids")
+                .map(|x| x.split(",").filter_map(|x| humantime::parse_duration(x).ok()).collect()),
+            merger_out_len_max: pairs
+                .get("mergerOutLenMax")
+                .map_or(Ok(None), |k| k.parse().map(|k| Some(k)))?,
+            scylla_read_queue_len: pairs
+                .get("scyllaReadQueueLen")
+                .map_or(Ok(None), |k| k.parse().map(|k| Some(k)))?,
+            test_do_wasm: pairs.get("testDoWasm").map(|x| String::from(x)),
+            log_level: pairs.get("log_level").map_or(String::new(), String::from),
+            use_rt: pairs
+                .get("useRt")
+                .map_or(Ok(None), |k| k.parse().map(Some).map_err(|_| Error::BadUseRt))?,
+        };
+        debug!("BinnedQuery::from_url  {:?}", ret);
+        Ok(ret)
+    }
+}
+
+impl AppendToUrl for BinnedQuery {
+    fn append_to_url(&self, url: &mut Url) {
+        self.channel.append_to_url(url);
+        self.range.append_to_url(url);
+        {
+            let mut g = url.query_pairs_mut();
+            if let Some(x) = self.bin_count {
+                g.append_pair("binCount", &format!("{}", x));
+            }
+            if let Some(x) = self.bin_width {
+                if x < Duration::from_secs(1) {
+                    g.append_pair("binWidth", &format!("{:.0}ms", x.subsec_millis()));
+                } else if x < Duration::from_secs(60) {
+                    g.append_pair("binWidth", &format!("{:.0}s", x.as_secs_f64()));
+                } else if x < Duration::from_secs(60 * 60) {
+                    g.append_pair("binWidth", &format!("{:.0}m", x.as_secs() / 60));
+                } else if x < Duration::from_secs(60 * 60 * 24) {
+                    g.append_pair("binWidth", &format!("{:.0}h", x.as_secs() / 60 / 60));
+                } else {
+                    g.append_pair("binWidth", &format!("{:.0}d", x.as_secs() / 60 / 60 / 24));
+                }
+            }
+        }
+        self.transform.append_to_url(url);
+        let mut g = url.query_pairs_mut();
+        if let Some(x) = &self.cache_usage {
+            g.append_pair("cacheUsage", &x.query_param_value());
+        }
+        if let Some(x) = &self.timeout_content {
+            g.append_pair("contentTimeout", &format!("{:.0}ms", 1e3 * x.as_secs_f64()));
+        }
+        if let Some(x) = &self.subgrids {
+            let s: String =
+                x.iter()
+                    .map(|&x| humantime::format_duration(x).to_string())
+                    .fold(String::new(), |mut a, x| {
+                        if a.len() != 0 {
+                            a.push_str(",");
+                        }
+                        a.push_str(&x);
+                        a
+                    });
+            g.append_pair("subgrids", &s);
+        }
+        if let Some(x) = self.buf_len_disk_io {
+            g.append_pair("bufLenDiskIo", &format!("{}", x));
+        }
+        if let Some(x) = &self.disk_stats_every {
+            g.append_pair("diskStatsEveryKb", &format!("{}", x.bytes() / 1024));
+        }
+        if let Some(x) = self.merger_out_len_max.as_ref() {
+            g.append_pair("mergerOutLenMax", &format!("{}", x));
+        }
+        if let Some(x) = self.scylla_read_queue_len.as_ref() {
+            g.append_pair("scyllaReadQueueLen", &x.to_string());
+        }
+        if let Some(x) = &self.test_do_wasm {
+            g.append_pair("testDoWasm", &x);
+        }
+        if self.log_level.len() != 0 {
+            g.append_pair("log_level", &self.log_level);
+        }
+        if let Some(x) = self.use_rt.as_ref() {
+            g.append_pair("useRt", &x.to_string());
+        }
+    }
+}
diff --git a/src/api4/events.rs b/src/api4/events.rs
new file mode 100644
index 0000000..294f816
--- /dev/null
+++ b/src/api4/events.rs
@@ -0,0 +1,670 @@
+use super::binned::BinnedQuery;
+use crate::transform::TransformQuery;
+use netpod::get_url_query_pairs;
+use netpod::is_false;
+use netpod::query::api1::Api1Query;
+use netpod::query::PulseRangeQuery;
+use netpod::query::TimeRangeQuery;
+use netpod::range::evrange::SeriesRange;
+use netpod::ttl::RetentionTime;
+use netpod::AppendToUrl;
+use netpod::ByteSize;
+use netpod::ChannelTypeConfigGen;
+use netpod::DiskIoTune;
+use netpod::FromUrl;
+use netpod::HasBackend;
+use netpod::HasTimeout;
+use netpod::SfDbChannel;
+use serde::Deserialize;
+use serde::Serialize;
+use std::collections::BTreeMap;
+use std::time::Duration;
+use url::Url;
+
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "EventsQuery")]
+pub enum Error {
+    BadInt(#[from] std::num::ParseIntError),
+    MissingTimerange,
+    BadQuery,
+    Transform(#[from] crate::transform::Error),
+    Netpod(#[from] netpod::NetpodError),
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct PlainEventsQuery {
+    channel: SfDbChannel,
+    range: SeriesRange,
+    #[serde(default, skip_serializing_if = "is_false", rename = "oneBeforeRange")]
+    one_before_range: bool,
+    #[serde(default, skip_serializing_if = "is_false", rename = "begExcl")]
+    beg_excl: bool,
+    #[serde(default = "TransformQuery::default_events")]
+    #[serde(skip_serializing_if = "TransformQuery::is_default_events")]
+    transform: TransformQuery,
+    #[serde(
+        default,
+        skip_serializing_if = "Option::is_none",
+        with = "humantime_serde",
+        rename = "contentTimeout"
+    )]
+    timeout_content: Option<Duration>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    events_max: Option<u64>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    bytes_max: Option<u64>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    allow_large_result: Option<bool>,
+    #[serde(default, skip_serializing_if = "Option::is_none", with = "humantime_serde")]
+    event_delay: Option<Duration>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    stream_batch_len: Option<usize>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    buf_len_disk_io: Option<usize>,
+    #[serde(default, skip_serializing_if = "is_false")]
+    do_test_main_error: bool,
+    #[serde(default, skip_serializing_if = "is_false")]
+    do_test_stream_error: bool,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    test_do_wasm: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    merger_out_len_max: Option<u32>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    scylla_read_queue_len: Option<u32>,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    create_errors: Vec<String>,
+    #[serde(default)]
+    log_level: String,
+    #[serde(default)]
+    use_rt: Option<RetentionTime>,
+    querymarker: String,
+}
+
+impl PlainEventsQuery {
+    pub fn new<R>(channel: SfDbChannel, range: R) -> Self
+    where
+        R: Into<SeriesRange>,
+    {
+        Self {
+            channel,
+            range: range.into(),
+            beg_excl: false,
+            one_before_range: false,
+            transform: TransformQuery::default_events(),
+            timeout_content: None,
+            events_max: None,
+            bytes_max: None,
+            allow_large_result: None,
+            event_delay: None,
+            stream_batch_len: None,
+            buf_len_disk_io: None,
+            do_test_main_error: false,
+            do_test_stream_error: false,
+            test_do_wasm: None,
+            merger_out_len_max: None,
+            scylla_read_queue_len: None,
+            create_errors: Vec::new(),
+            log_level: String::new(),
+            use_rt: None,
+            querymarker: String::new(),
+        }
+    }
+
+    pub fn channel(&self) -> &SfDbChannel {
+        &self.channel
+    }
+
+    pub fn range(&self) -> &SeriesRange {
+        &self.range
+    }
+
+    pub fn one_before_range(&self) -> bool {
+        self.one_before_range || self.transform.need_one_before_range()
+    }
+
+    pub fn transform(&self) -> &TransformQuery {
+        &self.transform
+    }
+
+    pub fn buf_len_disk_io(&self) -> usize {
+        self.buf_len_disk_io.unwrap_or(1024 * 8)
+    }
+
+    pub fn timeout_content(&self) -> Option<Duration> {
+        self.timeout_content
+    }
+
+    pub fn events_max(&self) -> u64 {
+        self.events_max.map_or_else(
+            || {
+                if self.allow_large_result_or_def() {
+                    1000 * 500
+                } else {
+                    1000 * 80
+                }
+            },
+            |x| x.min(1000 * 1000 * 4),
+        )
+    }
+
+    pub fn bytes_max(&self) -> u64 {
+        self.bytes_max.map_or_else(
+            || {
+                if self.allow_large_result_or_def() {
+                    1024 * 1024 * 80
+                } else {
+                    1024 * 1024 * 8
+                }
+            },
+            |x| x.min(1024 * 1024 * 400),
+        )
+    }
+
+    pub fn allow_large_result_or_def(&self) -> bool {
+        self.allow_large_result.unwrap_or(false)
+    }
+
+    pub fn event_delay(&self) -> &Option<Duration> {
+        &self.event_delay
+    }
+
+    pub fn merger_out_len_max(&self) -> Option<u32> {
+        self.merger_out_len_max
+    }
+
+    pub fn scylla_read_queue_len(&self) -> Option<u32> {
+        self.scylla_read_queue_len
+    }
+
+    pub fn do_test_main_error(&self) -> bool {
+        self.do_test_main_error
+    }
+
+    pub fn do_test_stream_error(&self) -> bool {
+        self.do_test_stream_error
+    }
+
+    pub fn test_do_wasm(&self) -> Option<&str> {
+        match &self.test_do_wasm {
+            Some(x) => Some(&x),
+            None => None,
+        }
+    }
+
+    pub fn set_series_id(&mut self, series: u64) {
+        self.channel.set_series(series);
+    }
+
+    pub fn set_do_test_main_error(&mut self, k: bool) {
+        self.do_test_main_error = k;
+    }
+
+    pub fn set_do_test_stream_error(&mut self, k: bool) {
+        self.do_test_stream_error = k;
+    }
+
+    pub fn for_time_weighted_scalar(mut self) -> Self {
+        self.transform = TransformQuery::for_time_weighted_scalar();
+        self
+    }
+
+    pub fn for_pulse_id_diff(mut self) -> Self {
+        self.transform = TransformQuery::for_pulse_id_diff();
+        self
+    }
+
+    pub fn is_event_blobs(&self) -> bool {
+        self.transform.is_event_blobs()
+    }
+
+    pub fn need_value_data(&self) -> bool {
+        self.transform.need_value_data()
+    }
+
+    pub fn create_errors_contains(&self, x: &str) -> bool {
+        self.create_errors.contains(&String::from(x))
+    }
+
+    pub fn summary_short(&self) -> String {
+        format!(
+            "PlainEventsQuery {{ chn: {}, range: {:?} }}",
+            self.channel().name(),
+            self.range()
+        )
+    }
+
+    pub fn log_level(&self) -> &str {
+        &self.log_level
+    }
+
+    pub fn use_rt(&self) -> Option<RetentionTime> {
+        self.use_rt.clone()
+    }
+}
+
+impl HasBackend for PlainEventsQuery {
+    fn backend(&self) -> &str {
+        self.channel.backend()
+    }
+}
+
+impl HasTimeout for PlainEventsQuery {
+    fn timeout(&self) -> Option<Duration> {
+        PlainEventsQuery::timeout_content(self)
+    }
+}
+
+impl FromUrl for PlainEventsQuery {
+    type Error = Error;
+
+    fn from_url(url: &Url) -> Result<Self, Self::Error> {
+        let pairs = get_url_query_pairs(url);
+        Self::from_pairs(&pairs)
+    }
+
+    fn from_pairs(pairs: &BTreeMap<String, String>) -> Result<Self, Self::Error> {
+        let range = if let Ok(x) = TimeRangeQuery::from_pairs(pairs) {
+            SeriesRange::TimeRange(x.into())
+        } else if let Ok(x) = PulseRangeQuery::from_pairs(pairs) {
+            SeriesRange::PulseRange(x.into())
+        } else {
+            return Err(Error::MissingTimerange);
+        };
+        let ret = Self {
+            channel: SfDbChannel::from_pairs(pairs)?,
+            range,
+            one_before_range: pairs.get("oneBeforeRange").map_or(false, |x| x == "true"),
+            beg_excl: pairs.get("begExcl").map_or(false, |x| x == "true"),
+            transform: TransformQuery::from_pairs(pairs)?,
+            timeout_content: pairs
+                .get("contentTimeout")
+                .and_then(|x| humantime::parse_duration(x).ok()),
+            events_max: pairs.get("eventsMax").map_or(None, |k| k.parse().ok()),
+            bytes_max: pairs.get("bytesMax").map_or(None, |k| k.parse().ok()),
+            allow_large_result: pairs.get("allowLargeResult").map_or(None, |x| x.parse().ok()),
+            event_delay: pairs.get("eventDelay").map_or(Ok(None), |k| {
+                k.parse::<u64>().map(|x| Duration::from_millis(x)).map(|k| Some(k))
+            })?,
+            stream_batch_len: pairs
+                .get("streamBatchLen")
+                .map_or(Ok(None), |k| k.parse().map(|k| Some(k)))?,
+            buf_len_disk_io: pairs
+                .get("bufLenDiskIo")
+                .map_or(Ok(None), |k| k.parse().map(|k| Some(k)))?,
+            do_test_main_error: pairs
+                .get("doTestMainError")
+                .map_or("false", |k| k)
+                .parse()
+                .map_err(|_| Error::BadQuery)?,
+            do_test_stream_error: pairs
+                .get("doTestStreamError")
+                .map_or("false", |k| k)
+                .parse()
+                .map_err(|_| Error::BadQuery)?,
+            // test_do_wasm: pairs
+            //     .get("testDoWasm")
+            //     .map(|x| x.parse::<bool>().ok())
+            //     .unwrap_or(None)
+            //     .unwrap_or(false),
+            test_do_wasm: pairs.get("testDoWasm").map(|x| String::from(x)),
+            merger_out_len_max: pairs
+                .get("mergerOutLenMax")
+                .map_or(Ok(None), |k| k.parse().map(|k| Some(k)))?,
+            scylla_read_queue_len: pairs
+                .get("scyllaReadQueueLen")
+                .map_or(Ok(None), |k| k.parse().map(|k| Some(k)))?,
+            create_errors: pairs
+                .get("create_errors")
+                .map(|x| x.split(",").map(|x| x.to_string()).collect())
+                .unwrap_or(Vec::new()),
+            log_level: pairs.get("log_level").map_or(String::new(), String::from),
+            use_rt: pairs
+                .get("useRt")
+                .map_or(Ok(None), |k| k.parse().map(Some).map_err(|_| Error::BadQuery))?,
+            querymarker: pairs.get("querymarker").map_or(String::new(), |x| x.to_string()),
+        };
+        Ok(ret)
+    }
+}
+
+impl AppendToUrl for PlainEventsQuery {
+    fn append_to_url(&self, url: &mut Url) {
+        match &self.range {
+            SeriesRange::TimeRange(k) => TimeRangeQuery::from(k).append_to_url(url),
+            SeriesRange::PulseRange(_) => todo!(),
+        }
+        self.channel.append_to_url(url);
+        let mut g = url.query_pairs_mut();
+        g.append_pair("oneBeforeRange", &self.one_before_range().to_string());
+        if self.beg_excl {
+            g.append_pair("begExcl", "true");
+        }
+        g.append_pair("querymarker", &self.querymarker);
+        drop(g);
+        self.transform.append_to_url(url);
+        let mut g = url.query_pairs_mut();
+        if let Some(x) = &self.timeout_content {
+            g.append_pair("contentTimeout", &format!("{:.0}ms", 1e3 * x.as_secs_f64()));
+        }
+        if let Some(x) = self.events_max.as_ref() {
+            g.append_pair("eventsMax", &x.to_string());
+        }
+        if let Some(x) = self.bytes_max.as_ref() {
+            g.append_pair("bytesMax", &x.to_string());
+        }
+        if let Some(x) = self.allow_large_result {
+            g.append_pair("allowLargeResult", &x.to_string());
+        }
+        if let Some(x) = self.event_delay.as_ref() {
+            g.append_pair("eventDelay", &format!("{:.0}", x.as_secs_f64() * 1e3));
+        }
+        if let Some(x) = self.stream_batch_len.as_ref() {
+            g.append_pair("streamBatchLen", &x.to_string());
+        }
+        if let Some(x) = self.buf_len_disk_io.as_ref() {
+            g.append_pair("bufLenDiskIo", &x.to_string());
+        }
+        if self.do_test_main_error {
+            g.append_pair("doTestMainError", "true");
+        }
+        if self.do_test_stream_error {
+            g.append_pair("doTestStreamError", "true");
+        }
+        if let Some(x) = &self.test_do_wasm {
+            g.append_pair("testDoWasm", &x);
+        }
+        if let Some(x) = self.merger_out_len_max.as_ref() {
+            g.append_pair("mergerOutLenMax", &x.to_string());
+        }
+        if let Some(x) = self.scylla_read_queue_len.as_ref() {
+            g.append_pair("scyllaReadQueueLen", &x.to_string());
+        }
+        if self.create_errors.len() != 0 {
+            g.append_pair("create_errors", &self.create_errors.join(","));
+        }
+        if self.log_level.len() != 0 {
+            g.append_pair("log_level", &self.log_level);
+        }
+        if let Some(x) = self.use_rt.as_ref() {
+            g.append_pair("useRt", &x.to_string());
+        }
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct EventsSubQuerySelect {
+    ch_conf: ChannelTypeConfigGen,
+    range: SeriesRange,
+    one_before_range: bool,
+    transform: TransformQuery,
+    wasm1: Option<String>,
+}
+
+impl EventsSubQuerySelect {
+    pub fn new(
+        ch_info: ChannelTypeConfigGen,
+        range: SeriesRange,
+        one_before_range: bool,
+        transform: TransformQuery,
+    ) -> Self {
+        Self {
+            ch_conf: ch_info,
+            range,
+            one_before_range,
+            transform,
+            wasm1: None,
+        }
+    }
+
+    pub fn wasm1(&self) -> Option<&str> {
+        match &self.wasm1 {
+            Some(x) => Some(&x),
+            None => None,
+        }
+    }
+
+    pub fn set_wasm1(&mut self, x: String) {
+        self.wasm1 = Some(x);
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct EventsSubQuerySettings {
+    timeout: Option<Duration>,
+    events_max: Option<u64>,
+    bytes_max: Option<u64>,
+    event_delay: Option<Duration>,
+    stream_batch_len: Option<usize>,
+    buf_len_disk_io: Option<usize>,
+    queue_len_disk_io: Option<usize>,
+    create_errors: Vec<String>,
+    use_rt: Option<RetentionTime>,
+    merger_out_len_max: Option<u32>,
+    scylla_read_queue_len: Option<u32>,
+}
+
+impl EventsSubQuerySettings {
+    pub fn merger_out_len_max(&self) -> Option<u32> {
+        self.merger_out_len_max
+    }
+
+    pub fn scylla_read_queue_len(&self) -> Option<u32> {
+        self.scylla_read_queue_len
+    }
+}
+
+impl Default for EventsSubQuerySettings {
+    fn default() -> Self {
+        Self {
+            timeout: None,
+            events_max: None,
+            bytes_max: None,
+            event_delay: None,
+            stream_batch_len: None,
+            buf_len_disk_io: None,
+            queue_len_disk_io: None,
+            create_errors: Vec::new(),
+            use_rt: None,
+            merger_out_len_max: None,
+            scylla_read_queue_len: None,
+        }
+    }
+}
+
+impl From<&PlainEventsQuery> for EventsSubQuerySettings {
+    fn from(value: &PlainEventsQuery) -> Self {
+        Self {
+            timeout: value.timeout_content(),
+            events_max: value.events_max,
+            bytes_max: value.bytes_max,
+            event_delay: value.event_delay,
+            stream_batch_len: value.stream_batch_len,
+            buf_len_disk_io: value.buf_len_disk_io,
+            // TODO add to query
+            queue_len_disk_io: None,
+            create_errors: value.create_errors.clone(),
+            use_rt: value.use_rt(),
+            merger_out_len_max: value.merger_out_len_max(),
+            scylla_read_queue_len: value.scylla_read_queue_len(),
+        }
+    }
+}
+
+impl From<&BinnedQuery> for EventsSubQuerySettings {
+    fn from(value: &BinnedQuery) -> Self {
+        Self {
+            timeout: value.timeout(),
+            // TODO ?
+            events_max: None,
+            bytes_max: None,
+            event_delay: None,
+            stream_batch_len: None,
+            buf_len_disk_io: None,
+            // TODO add to query
+            queue_len_disk_io: None,
+            create_errors: Vec::new(),
+            use_rt: value.use_rt(),
+            merger_out_len_max: value.merger_out_len_max(),
+            scylla_read_queue_len: value.scylla_read_queue_len(),
+        }
+    }
+}
+
+impl From<&Api1Query> for EventsSubQuerySettings {
+    fn from(value: &Api1Query) -> Self {
+        let disk_io_tune = value.disk_io_tune();
+        Self {
+            timeout: value.timeout(),
+            // TODO ?
+            events_max: None,
+            bytes_max: None,
+            event_delay: None,
+            stream_batch_len: None,
+            buf_len_disk_io: Some(disk_io_tune.read_buffer_len),
+            queue_len_disk_io: Some(disk_io_tune.read_queue_len),
+            create_errors: Vec::new(),
+            use_rt: None,
+            merger_out_len_max: None,
+            scylla_read_queue_len: None,
+        }
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct EventsSubQuery {
+    select: EventsSubQuerySelect,
+    settings: EventsSubQuerySettings,
+    ty: String,
+    reqid: String,
+    log_level: String,
+}
+
+impl EventsSubQuery {
+    pub fn from_parts(
+        select: EventsSubQuerySelect,
+        settings: EventsSubQuerySettings,
+        reqid: String,
+        log_level: String,
+    ) -> Self {
+        Self {
+            select,
+            settings,
+            ty: "EventsSubQuery".into(),
+            reqid,
+            log_level,
+        }
+    }
+
+    pub fn backend(&self) -> &str {
+        &self.select.ch_conf.backend()
+    }
+
+    pub fn name(&self) -> &str {
+        &self.select.ch_conf.name()
+    }
+
+    pub fn range(&self) -> &SeriesRange {
+        &self.select.range
+    }
+
+    pub fn need_one_before_range(&self) -> bool {
+        self.select.one_before_range | self.transform().need_one_before_range()
+    }
+
+    pub fn transform(&self) -> &TransformQuery {
+        &self.select.transform
+    }
+
+    pub fn ch_conf(&self) -> &ChannelTypeConfigGen {
+        &self.select.ch_conf
+    }
+
+    pub fn timeout(&self) -> Duration {
+        self.settings.timeout.unwrap_or(Duration::from_millis(10000))
+    }
+
+    pub fn events_max(&self) -> u64 {
+        self.settings.events_max.unwrap_or(1024 * 128)
+    }
+
+    pub fn event_delay(&self) -> &Option<Duration> {
+        &self.settings.event_delay
+    }
+
+    pub fn disk_io_tune(&self) -> DiskIoTune {
+        let mut tune = DiskIoTune::default();
+        if let Some(x) = self.settings.buf_len_disk_io {
+            tune.read_buffer_len = x;
+        }
+        tune
+    }
+
+    pub fn inmem_bufcap(&self) -> ByteSize {
+        // TODO should depend on the type of backend: only imagebuffer needs large size.
+        ByteSize::from_kb(1024 * 30)
+    }
+
+    // A rough indication on how many bytes this request is allowed to return. Otherwise, the result should
+    // be a partial result.
+    pub fn bytes_max(&self) -> u64 {
+        self.settings.events_max.unwrap_or(1024 * 512)
+    }
+
+    pub fn is_event_blobs(&self) -> bool {
+        self.select.transform.is_event_blobs()
+    }
+
+    pub fn need_value_data(&self) -> bool {
+        self.select.transform.need_value_data()
+    }
+
+    pub fn create_errors_contains(&self, x: &str) -> bool {
+        self.settings.create_errors.contains(&String::from(x))
+    }
+
+    pub fn reqid(&self) -> &str {
+        &self.reqid
+    }
+
+    pub fn wasm1(&self) -> Option<&str> {
+        self.select.wasm1()
+    }
+
+    pub fn log_level(&self) -> &str {
+        &self.log_level
+    }
+
+    pub fn use_rt(&self) -> Option<RetentionTime> {
+        self.settings.use_rt.clone()
+    }
+
+    pub fn merger_out_len_max(&self) -> Option<u32> {
+        self.settings.merger_out_len_max()
+    }
+
+    pub fn settings(&self) -> &EventsSubQuerySettings {
+        &self.settings
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Frame1Parts {
+    query: EventsSubQuery,
+}
+
+impl Frame1Parts {
+    pub fn new(query: EventsSubQuery) -> Self {
+        Self { query }
+    }
+
+    pub fn parts(self) -> (EventsSubQuery,) {
+        (self.query,)
+    }
+}
+
+#[test]
+fn parse_frame1() {
+    let inp = r##"{"query":{"select":{"ch_conf":{"Scylla":{"backend":"swissfel-daqbuf-ca","series":2367705320261409690,"scalar_type":"ChannelStatus","shape":[],"name":"SLGRE-LI2C03_CH6:TEMP"}},"range":{"TimeRange":{"beg":1695736001000000000,"end":1695736301000000000}},"transform":{"event":"ValueFull","time_binning":"None"},"wasm1":null},"settings":{"timeout":null,"events_max":200000,"event_delay":null,"stream_batch_len":null,"buf_len_disk_io":null,"queue_len_disk_io":null,"create_errors":[]},"ty":"EventsSubQuery","reqid":"3ea23209"}}"##;
+    // TODO assert
+    let _v: Frame1Parts = serde_json::from_str(inp).unwrap();
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..598bce0
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod api4;
+pub mod transform;
diff --git a/src/transform.rs b/src/transform.rs
new file mode 100644
index 0000000..1f4d59a
--- /dev/null
+++ b/src/transform.rs
@@ -0,0 +1,287 @@
+use netpod::get_url_query_pairs;
+use netpod::log::*;
+use netpod::AppendToUrl;
+use netpod::FromUrl;
+use serde::Deserialize;
+use serde::Serialize;
+use std::collections::BTreeMap;
+use thiserror;
+use url::Url;
+
+#[derive(Debug, thiserror::Error)]
+#[cstm(name = "Query")]
+pub enum Error {
+    ParseInt(#[from] std::num::ParseIntError),
+    BadEnumAsString,
+    BadBinningScheme,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub enum EventTransformQuery {
+    EventBlobsVerbatim,
+    EventBlobsUncompressed,
+    ValueFull,
+    ArrayPick(usize),
+    // TODO should rename to scalar? dim0 will only stay a scalar.
+    MinMaxAvgDev,
+    PulseIdDiff,
+}
+
+impl EventTransformQuery {
+    pub fn need_value_data(&self) -> bool {
+        match self {
+            EventTransformQuery::EventBlobsVerbatim => true,
+            EventTransformQuery::EventBlobsUncompressed => true,
+            EventTransformQuery::ValueFull => true,
+            EventTransformQuery::ArrayPick(_) => true,
+            EventTransformQuery::MinMaxAvgDev => true,
+            EventTransformQuery::PulseIdDiff => false,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub enum TimeBinningTransformQuery {
+    None,
+    TimeWeighted,
+    Unweighted,
+}
+
+impl TimeBinningTransformQuery {
+    pub fn need_one_before_range(&self) -> bool {
+        match self {
+            TimeBinningTransformQuery::None => false,
+            TimeBinningTransformQuery::TimeWeighted => true,
+            TimeBinningTransformQuery::Unweighted => false,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub struct TransformQuery {
+    event: EventTransformQuery,
+    time_binning: TimeBinningTransformQuery,
+    // #[serde(default, skip_serializing_if = "Option::is_none")]
+    enum_as_string: Option<bool>,
+}
+
+impl TransformQuery {
+    fn url_prefix() -> &'static str {
+        "transform"
+    }
+
+    pub fn default_events() -> Self {
+        Self {
+            event: EventTransformQuery::ValueFull,
+            time_binning: TimeBinningTransformQuery::None,
+            enum_as_string: None,
+        }
+    }
+
+    pub fn default_time_binned() -> Self {
+        Self {
+            event: EventTransformQuery::MinMaxAvgDev,
+            time_binning: TimeBinningTransformQuery::TimeWeighted,
+            enum_as_string: None,
+        }
+    }
+
+    pub fn is_default_events(&self) -> bool {
+        self == &Self::default_events()
+    }
+
+    pub fn is_default_time_binned(&self) -> bool {
+        self == &Self::default_time_binned()
+    }
+
+    pub fn for_event_blobs() -> Self {
+        Self {
+            event: EventTransformQuery::EventBlobsVerbatim,
+            time_binning: TimeBinningTransformQuery::None,
+            enum_as_string: None,
+        }
+    }
+
+    pub fn for_time_weighted_scalar() -> Self {
+        Self {
+            event: EventTransformQuery::MinMaxAvgDev,
+            time_binning: TimeBinningTransformQuery::TimeWeighted,
+            enum_as_string: None,
+        }
+    }
+
+    pub fn for_pulse_id_diff() -> Self {
+        Self {
+            event: EventTransformQuery::PulseIdDiff,
+            // TODO probably we want unweighted binning here.
+            time_binning: TimeBinningTransformQuery::TimeWeighted,
+            enum_as_string: None,
+        }
+    }
+
+    pub fn is_event_blobs(&self) -> bool {
+        match &self.event {
+            EventTransformQuery::EventBlobsVerbatim => true,
+            EventTransformQuery::EventBlobsUncompressed => {
+                error!("TODO decide on uncompressed event blobs");
+                panic!()
+            }
+            _ => false,
+        }
+    }
+
+    pub fn need_value_data(&self) -> bool {
+        self.event.need_value_data()
+    }
+
+    pub fn need_one_before_range(&self) -> bool {
+        self.time_binning.need_one_before_range()
+    }
+
+    pub fn is_pulse_id_diff(&self) -> bool {
+        match &self.event {
+            EventTransformQuery::PulseIdDiff => true,
+            _ => false,
+        }
+    }
+
+    pub fn get_tr_event(&self) -> &EventTransformQuery {
+        &self.event
+    }
+
+    pub fn get_tr_time_binning(&self) -> &TimeBinningTransformQuery {
+        &self.time_binning
+    }
+
+    pub fn enum_as_string(&self) -> Option<bool> {
+        self.enum_as_string.clone()
+    }
+
+    pub fn do_wasm(&self) -> Option<&str> {
+        None
+    }
+}
+
+impl FromUrl for TransformQuery {
+    type Error = Error;
+
+    fn from_url(url: &Url) -> Result<Self, Self::Error> {
+        let pairs = get_url_query_pairs(url);
+        Self::from_pairs(&pairs)
+    }
+
+    fn from_pairs(pairs: &BTreeMap<String, String>) -> Result<Self, Self::Error> {
+        let enum_as_string = if let Some(k) = pairs.get("enumAsString") {
+            Some(k.parse().map_err(|_| Error::BadEnumAsString)?)
+        } else {
+            None
+        };
+        // enum_string: Ok(pairs.get("enumString")).and_then(|x| {
+        //     x.map_or(Ok(None), |k| {
+        //         k.parse()
+        //             .map_err(|_| Error::with_public_msg_no_trace(format!("can not parse enumString: {}", k)))?
+        //     })
+        // })?,
+        let upre = Self::url_prefix();
+        let key = "binningScheme";
+        if let Some(s) = pairs.get(key) {
+            let ret = if s == "eventBlobs" {
+                TransformQuery {
+                    event: EventTransformQuery::EventBlobsVerbatim,
+                    time_binning: TimeBinningTransformQuery::None,
+                    enum_as_string,
+                }
+            } else if s == "fullValue" {
+                TransformQuery {
+                    event: EventTransformQuery::ValueFull,
+                    time_binning: TimeBinningTransformQuery::None,
+                    enum_as_string,
+                }
+            } else if s == "timeWeightedScalar" {
+                TransformQuery {
+                    event: EventTransformQuery::MinMaxAvgDev,
+                    time_binning: TimeBinningTransformQuery::TimeWeighted,
+                    enum_as_string,
+                }
+            } else if s == "unweightedScalar" {
+                TransformQuery {
+                    event: EventTransformQuery::ValueFull,
+                    time_binning: TimeBinningTransformQuery::None,
+                    enum_as_string,
+                }
+            } else if s == "binnedX" {
+                let _u: usize = pairs.get("binnedXcount").map_or("1", |k| k).parse()?;
+                warn!("TODO binnedXcount");
+                TransformQuery {
+                    event: EventTransformQuery::MinMaxAvgDev,
+                    time_binning: TimeBinningTransformQuery::None,
+                    enum_as_string,
+                }
+            } else if s == "pulseIdDiff" {
+                TransformQuery {
+                    event: EventTransformQuery::PulseIdDiff,
+                    time_binning: TimeBinningTransformQuery::None,
+                    enum_as_string,
+                }
+            } else {
+                return Err(Error::BadBinningScheme);
+            };
+            Ok(ret)
+        } else {
+            // TODO add option to pick from array.
+            let _pick = pairs
+                .get(&format!("{}ArrayPick", upre))
+                .map(|x| match x.parse::<usize>() {
+                    Ok(n) => Some(n),
+                    Err(_) => None,
+                })
+                .unwrap_or(None);
+            let ret = TransformQuery {
+                event: EventTransformQuery::ValueFull,
+                time_binning: TimeBinningTransformQuery::None,
+                enum_as_string,
+            };
+            Ok(ret)
+        }
+    }
+}
+
+impl AppendToUrl for TransformQuery {
+    fn append_to_url(&self, url: &mut Url) {
+        let mut g = url.query_pairs_mut();
+        if false {
+            let upre = Self::url_prefix();
+            if let Some(x) = &Some(123) {
+                g.append_pair(&format!("{}ArrayPick", upre), &format!("{}", x));
+            }
+        }
+        let key = "binningScheme";
+        match &self.event {
+            EventTransformQuery::EventBlobsVerbatim => {
+                g.append_pair(key, &format!("{}", "eventBlobs"));
+            }
+            EventTransformQuery::EventBlobsUncompressed => {
+                // TODO
+                g.append_pair(key, &format!("{}", "eventBlobs"));
+            }
+            EventTransformQuery::ValueFull => {
+                g.append_pair(key, &format!("{}", "fullValue"));
+            }
+            EventTransformQuery::ArrayPick(_) => {
+                // TODO
+                g.append_pair(key, &format!("{}", "fullValue"));
+            }
+            EventTransformQuery::MinMaxAvgDev => {
+                g.append_pair(key, &format!("{}", "timeWeightedScalar"));
+            }
+            EventTransformQuery::PulseIdDiff => {
+                g.append_pair(key, &format!("{}", "pulseIdDiff"));
+            }
+        }
+        if let Some(x) = self.enum_as_string {
+            if x {
+                g.append_pair("enumAsString", "true");
+            }
+        }
+    }
+}