/series request optimizations

lib/db/clickhouse.js

@@ -1110,43 +1110,58 @@ const scanClickhouse = function (settings, client, params) {
  */
 const getSeries = async (matches) => {
   const query = transpiler.transpileSeries(matches)
-  const stream = await axios.post(`${getClickhouseUrl()}`, query + ' FORMAT JSONEachRow', {
+  const stream = await rawRequest(query + ' FORMAT JSONEachRow', null, DATABASE_NAME(), {
     responseType: 'stream'
   })
-  const dStream = StringStream.from(stream.data).lines().map(l => {
-    if (!l) {
-      return null
-    }
-    try {
-      return JSON.parse(l)
-    } catch (err) {
-      logger.error({ line: l, err }, 'Error parsing line')
-      return null
-    }
-  }, DataStream).filter(e => e)
   const res = new Transform({
     transform (chunk, encoding, callback) {
       callback(null, chunk)
     }
   })
-  setTimeout(async () => {
-    const gen = dStream.toGenerator()
-    res.write('{"status":"success", "data":[', 'utf-8')
-    let i = 0
-    try {
-      for await (const item of gen()) {
-        if (!item || !item.labels) {
-          continue
+  res.write('{"status":"success", "data":[', 'utf-8')
+  let lastString = ''
+  let i = 0
+  let lastData = 0
+  let open = true
+  stream.data.on('data', (chunk) => {
+    lastData = Date.now()
+    const strChunk = Buffer.from(chunk).toString('utf-8')
+    const lines = (lastString + strChunk).split('\n')
+    lastString = lines.pop()
+    lines.forEach(line => {
+      if (!line) {
+        return
+      }
+      try {
+        const obj = JSON.parse(line)
+        if (obj.labels) {
+          res.write((i === 0 ? '' : ',') + obj.labels)
+          ++i
         }
-        res.write((i === 0 ? '' : ',') + item.labels)
-        ++i
+      } catch (err) {
+        logger.error({ line: line, err }, 'Error parsing line')
       }
-    } catch (e) {
-      logger.error(e)
-    } finally {
-      res.end(']}', 'utf-8')
+    })
+  })
+  const close = () => {
+    if (lastString) {
+      res.write((i === 0 ? '' : ',') + lastString)
     }
-  }, 0)
+    res.end(']}')
+    open = false
+  }
+  const maybeClose = () => {
+    if (open && Date.now() - lastData >= 10000) {
+      close()
+    }
+    if (open && Date.now() - lastData < 10000) {
+      setTimeout(maybeClose, 10000)
+    }
+  }
+  setTimeout(maybeClose, 10000)
+  stream.data.on('end', close)
+  stream.data.on('error', close)
+  stream.data.on('finish', close)
   return res
 }
 

lib/handlers/label_values.js

@@ -27,7 +27,11 @@ async function handler (req, res) {
     `type IN (${types.map(t => `${t}`).join(',')})`
   ].filter(w => w)
   where = `WHERE ${where.join(' AND ')}`
-  const q = `SELECT DISTINCT val FROM time_series_gin${dist} ${where} FORMAT JSON`
+  let limit = ''
+  if (process.env.ADVANCED_SERIES_REQUEST_LIMIT) {
+    limit = `LIMIT ${process.env.ADVANCED_SERIES_REQUEST_LIMIT}`
+  }
+  const q = `SELECT DISTINCT val FROM time_series_gin${dist} ${where} ${limit} FORMAT JSON`
   const allValues = await clickhouse.rawRequest(q, null, utils.DATABASE_NAME())
   const resp = { status: 'success', data: allValues.data.data.map(r => r.val) }
   return res.send(resp)

package.json

@@ -79,7 +79,8 @@
     "basic-auth": "^2.0.1",
     "google-protobuf": "^3.21.2",
     "@grpc/grpc-js": "^1.10.6",
-    "@grpc/proto-loader": "^0.7.12"
+    "@grpc/proto-loader": "^0.7.12",
+    "pako": "^2.1.0"
   },
   "devDependencies": {
     "@elastic/elasticsearch": "^8.5.0",

parser/transpiler.js

@@ -442,6 +442,9 @@ module.exports.transpileSeries = (request) => {
     const _query = getQuery(req)
     query.withs.idx_sel.query.sqls.push(_query.withs.idx_sel.query)
   }
+  if (process.env.ADVANCED_SERIES_REQUEST_LIMIT) {
+    query.limit(process.env.ADVANCED_SERIES_REQUEST_LIMIT)
+  }
   setQueryParam(query, sharedParamNames.timeSeriesTable, `${DATABASE_NAME()}.time_series${dist}`)
   setQueryParam(query, sharedParamNames.samplesTable, `${DATABASE_NAME()}.${samplesReadTableName()}${dist}`)
   // logger.debug(query.toString())

qryn_node.js

@@ -5,6 +5,7 @@
  * (C) 2018-2024 QXIP BV
  */
 const { boolEnv, readerMode, writerMode } = require('./common')
+const { Duplex } = require('stream')
 
 this.readonly = boolEnv('READONLY')
 this.http_user = process.env.QRYN_LOGIN || process.env.CLOKI_LOGIN || undefined
@@ -54,6 +55,7 @@ this.pushOTLP = DATABASE.pushOTLP
 this.queryTempoTags = DATABASE.queryTempoTags
 this.queryTempoValues = DATABASE.queryTempoValues
 let profiler = null
+const pako = require('pako')
 
 const {
   shaper,
@@ -121,7 +123,37 @@ let fastify = require('fastify')({
     })
     done()
   }))
-  await fastify.register(require('@fastify/compress'))
+  await fastify.register(require('@fastify/compress'), {
+    encodings: ['gzip'],
+    zlib: {
+      createGzip: () => {
+        const deflator = new pako.Deflate({ gzip: true })
+        let lastChunk = null
+        const res = new Duplex({
+          write: (chunk, encoding, next) => {
+            lastChunk && deflator.push(lastChunk)
+            lastChunk = chunk
+            next()
+          },
+          read: function (size) {
+          },
+          final (callback) {
+            deflator.onEnd = async () => {
+              res.push(null)
+              callback(null)
+            }
+            !lastChunk && callback()
+            lastChunk && deflator.push(lastChunk, true)
+          },
+          emitClose: true
+        })
+        deflator.onData = (chunk) => {
+          res.push(chunk)
+        }
+        return res
+      }
+    }
+  })
   await fastify.register(require('@fastify/url-data'))
   await fastify.register(require('@fastify/websocket'))