query by chunks

Cargo.lock

@@ -11,6 +11,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61604a8f862e1d5c3229fdd78f8b02c68dcf73a4c4b05fd636d12240aaa242c1"
+
 [[package]]
 name = "async-trait"
 version = "0.1.51"
@@ -686,6 +692,7 @@ checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 name = "subbeat"
 version = "0.0.2"
 dependencies = [
+ "anyhow",
  "async-trait",
  "bytes",
  "clap",

Cargo.toml

@@ -21,5 +21,5 @@ serde_json = "1.0.68"
 serde_derive = "1.0"
 serde_qs = "0.8.5"
 async-trait = "0.1.51"
-
+anyhow = "1.0.13"
 

README.md

@@ -4,5 +4,5 @@ subbeat
 ## Example
 
 ```
-subbeat http://localhost:3000 eyJrIjoiWnRRMTNmcGpvTHNPb3UzNzdUNUphRm53Rk9tMTNzOTQiLCJuIjoic3ViYmVhdC10ZXN0IiwiaWQiOjF9 "/api/datasources/proxy/1/api/v1/query_range" "rate(go_memstats_alloc_bytes_total[5m])" 1634672070 1634672970
+subbeat grafana http://localhost:3000 eyJrIjoiWnRRMTNmcGpvTHNPb3UzNzdUNUphRm53Rk9tMTNzOTQiLCJuIjoic3ViYmVhdC10ZXN0IiwiaWQiOjF9 "/api/datasources/proxy/1/api/v1/query_range" "rate(go_memstats_alloc_bytes_total[5m])" 1634672070 1634672970 15
 ```

src/cli.rs

@@ -6,16 +6,18 @@ pub struct CLI {
     pub datasource_url: String,
     pub query: String,
     pub from: u64,
-    pub to: u64
+    pub to: u64,
+    pub step: u64,
 }
 
 impl CLI {
-
     pub fn new() -> CLI {
-
         let matches = App::new("subbeat")
             .version("0.0.2")
             .about("Timeseries toolkit")
+            .subcommand(
+                SubCommand::with_name("grafana")
+                    .about("Use Grafana as datasource")
                     .arg(
                         Arg::with_name("GRAFANA_URL")
                             .help("URL to your Grafana instance")
@@ -24,7 +26,9 @@ impl CLI {
                     )
                     .arg(
                         Arg::with_name("GRAFANA_API_KEY")
-                    .help("Grafna API Key. Go to http://<grafana-url>/org/apikeys to get one")
+                            .help(
+                                "Grafna API Key. Go to http://<grafana-url>/org/apikeys to get one",
+                            )
                             .required(true)
                             .index(2),
                     )
@@ -52,22 +56,42 @@ impl CLI {
                             .required(true)
                             .index(6),
                     )
+                    .arg(
+                        Arg::with_name("step")
+                            .help("aggregation step")
+                            .required(true)
+                            .index(7),
+                    ),
+            )
             .get_matches();
 
+        if let Some(matches) = matches.subcommand_matches("grafana") {
             let url = matches.value_of("GRAFANA_URL").unwrap();
             let key = matches.value_of("GRAFANA_API_KEY").unwrap();
             let datasource_url = matches.value_of("datasource_url").unwrap();
             let query = matches.value_of("query").unwrap();
             let from = matches.value_of("from").unwrap().parse().unwrap();
             let to = matches.value_of("to").unwrap().parse().unwrap();
-
-        CLI{
+            let step = matches.value_of("step").unwrap().parse().unwrap();
+            return CLI {
                 url: url.to_owned(),
                 key: key.to_owned(),
                 datasource_url: datasource_url.to_owned(),
                 query: query.to_owned(),
                 from,
-            to
+                to,
+                step,
+            };
+        } else {
+            return CLI {
+                url: "url.to_owned()".to_string(),
+                key: "key.to_owned()".to_string(),
+                datasource_url: "datasource_url.to_owned()".to_string(),
+                query: "query.to_owned()".to_string(),
+                from: 0,
+                to: 0,
+                step: 0,
+            };
         }
     }
 }

src/grafana_service/prometheus.rs

@@ -1,4 +1,5 @@
 use async_trait::async_trait;
+use hyper::StatusCode;
 use serde_json::Value;
 
 use crate::{
@@ -61,8 +62,8 @@ fn parse_result(value: Value) -> types::Result<MetricResult> {
         })
         .collect::<Vec<(u64, f64)>>();
 
-    let mut result = MetricResult::new();
-    result.insert(metric_name, values.to_owned());
+    let mut result: MetricResult = Default::default();
+    result.data.insert(metric_name, values.to_owned());
 
     // println!("{:?}", result);
 
@@ -71,7 +72,11 @@ fn parse_result(value: Value) -> types::Result<MetricResult> {
 
 #[async_trait]
 impl Metric for Prometheus<'_> {
-    async fn query(&self, from: u64, to: u64, step: u64) -> types::Result<MetricResult> {
+    async fn query_chunk(&self, from: u64, to: u64, step: u64) -> types::Result<MetricResult> {
+        if from >= to {
+            panic!("from >= to");
+        }
+
         let q = Query {
             query: self.query.to_owned(),
             step: step,
@@ -79,14 +84,19 @@ impl Metric for Prometheus<'_> {
             end: to,
         };
 
-        // TODO: use serialisatoin from serde
-
         let rq = qs::to_string(&q)?;
         let (status_code, value) = self.grafana_service.post_form(&self.url, &rq).await?;
-        // TODO: return error
-        // if status_code != StatusCode::OK {
-        //     return std::error::("Bad status code");
-        // }
+
+        if status_code != StatusCode::OK {
+            // println!("Error: status code {:?}", status_code);
+            let error = &value["error"].as_str().unwrap();
+
+            return Err(anyhow::anyhow!("Can`t query: {}", error));
+        }
+
+        // println!("{:?}", value);
+
+        // return Ok(Default::default());
 
         // println!("{:?}", value);
 

src/main.rs

@@ -1,12 +1,10 @@
-
 use subbeat::grafana_service;
 
-mod types;
 mod cli;
+mod types;
 
 #[tokio::main]
 async fn main() -> types::Result<()> {
-    
     let cli = cli::CLI::new();
 
     let gs = grafana_service::GrafanaService::new(cli.url.to_string(), cli.key.to_string());
@@ -15,19 +13,13 @@ async fn main() -> types::Result<()> {
     // gs.get_datasources().await?;
     // "http://localhost:3000/d/YeBxHjzWz/starter-app-stats?editPanel=2&orgId=1"
     let r = gs
-        .extract_metrics(
-            &cli.datasource_url,
-            &cli.query,
-            cli.from,
-            cli.to,
-            15,
-        )
+        .extract_metrics(&cli.datasource_url, &cli.query, cli.from, cli.to, cli.step)
         .await?;
 
-    let key = r.keys().nth(0).unwrap();
+    let key = r.data.keys().nth(0).unwrap();
     println!("{}", key);
 
-    let vs = &r[key];
+    let vs = &r.data[key];
     for (t, v) in vs.iter() {
         println!("{}\t{}", t, v);
     }

src/metric.rs

@@ -1,10 +1,12 @@
 use async_trait::async_trait;
-use std::collections::HashMap;
+use std::{collections::HashMap, result};
 
 use crate::types;
 
 pub type MetricId = String;
 
+const CHUNK_SIZE: u64 = 10_000;
+
 struct DatasourceParams {
     db: String,
     q: String,
@@ -26,9 +28,65 @@ struct MetricQuery {
     headers: Option<HashMap<String, String>>,
 }
 
-pub type MetricResult = HashMap<String, Vec<(u64, f64)>>;
+pub struct MetricResult {
+    pub data: HashMap<String, Vec<(u64, f64)>>,
+}
+
+impl MetricResult {
+    pub fn merge_with(&mut self, mr: &MetricResult) {
+        for (k, v) in mr.data.iter() {
+            // TODO: think how to make it faster
+            if self.data.contains_key(k) {
+                self.data.get_mut(k).unwrap().extend(v.iter())
+            } else {
+                // panic!("not contain key");
+                self.data.insert(k.to_owned(), v.to_owned());
+            }
+        }
+    }
+}
+
+impl Default for MetricResult {
+    fn default() -> MetricResult {
+        return MetricResult {
+            data: HashMap::<String, Vec<(u64, f64)>>::new(),
+        };
+    }
+}
 
 #[async_trait]
 pub trait Metric {
-    async fn query(&self, from: u64, to: u64, step: u64) -> types::Result<MetricResult>;
+    // (to - from) / step < 10000
+    async fn query_chunk(&self, from: u64, to: u64, step: u64) -> types::Result<MetricResult>;
+
+    // TODO: mov eit to grafana-spicific logic
+    async fn query(&self, from: u64, to: u64, step: u64) -> types::Result<MetricResult> {
+        if from >= to {
+            panic!("from >= to");
+        }
+
+        if step == 0 {
+            panic!("step equals 0");
+        }
+
+        let chunk_timespan_size = CHUNK_SIZE * step;
+
+        let mut chunks = Vec::<(u64, u64)>::new();
+        {
+            let mut f = from;
+            while f < to {
+                let next = to.min(f + chunk_timespan_size);
+                chunks.push((f, next));
+                f = next;
+            }
+        }
+
+        let mut result: MetricResult = Default::default();
+        for (f, t) in chunks.iter() {
+            let r = self.query_chunk(*f, *t, step).await?;
+            result.merge_with(&r);
+        }
+
+        Ok(result)
+    }
 }

src/types.rs

@@ -1,2 +1,5 @@
+use anyhow;
+
 // A simple type alias so as to DRY.
-pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error + Send + Sync>>;
+
+pub type Result<T> = anyhow::Result<T>;