Add handler for accounting and refactor

crates/query/src/api4.rs

@@ -1,2 +1,53 @@
 pub mod binned;
 pub mod events;
+
+use err::Error;
+use netpod::get_url_query_pairs;
+use netpod::AppendToUrl;
+use netpod::FromUrl;
+use netpod::HasBackend;
+use netpod::HasTimeout;
+use serde::Deserialize;
+use serde::Serialize;
+use std::time::Duration;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AccountingIngestedBytesQuery {
+    backend: String,
+}
+
+impl HasBackend for AccountingIngestedBytesQuery {
+    fn backend(&self) -> &str {
+        &self.backend
+    }
+}
+
+impl HasTimeout for AccountingIngestedBytesQuery {
+    fn timeout(&self) -> Duration {
+        Duration::from_millis(5000)
+    }
+}
+
+impl FromUrl for AccountingIngestedBytesQuery {
+    fn from_url(url: &url::Url) -> Result<Self, err::Error> {
+        let pairs = get_url_query_pairs(url);
+        Self::from_pairs(&pairs)
+    }
+
+    fn from_pairs(pairs: &std::collections::BTreeMap<String, String>) -> Result<Self, Error> {
+        let ret = Self {
+            backend: pairs
+                .get("backend")
+                .ok_or_else(|| Error::with_msg_no_trace("missing backend"))?
+                .to_string(),
+        };
+        Ok(ret)
+    }
+}
+
+impl AppendToUrl for AccountingIngestedBytesQuery {
+    fn append_to_url(&self, url: &mut url::Url) {
+        let mut g = url.query_pairs_mut();
+        g.append_pair("backend", &self.backend);
+    }
+}