vitess.io/vitess@v0.16.2/go/vt/vtgate/querylog.go (about) 1 /* 2 Copyright 2019 The Vitess Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package vtgate 18 19 import ( 20 "net/http" 21 "sync" 22 23 "vitess.io/vitess/go/streamlog" 24 ) 25 26 var ( 27 // QueryLogHandler is the debug UI path for exposing query logs 28 QueryLogHandler = "/debug/querylog" 29 30 // QueryLogzHandler is the debug UI path for exposing query logs 31 QueryLogzHandler = "/debug/querylogz" 32 33 // QueryzHandler is the debug UI path for exposing query plan stats 34 QueryzHandler = "/debug/queryz" 35 36 // QueryLogger enables streaming logging of queries 37 QueryLogger *streamlog.StreamLogger 38 queryLoggerMu sync.Mutex 39 ) 40 41 func SetQueryLogger(logger *streamlog.StreamLogger) { 42 queryLoggerMu.Lock() 43 defer queryLoggerMu.Unlock() 44 QueryLogger = logger 45 } 46 47 func initQueryLogger(vtg *VTGate) error { 48 SetQueryLogger(streamlog.New("VTGate", queryLogBufferSize)) 49 QueryLogger.ServeLogs(QueryLogHandler, streamlog.GetFormatter(QueryLogger)) 50 51 http.HandleFunc(QueryLogzHandler, func(w http.ResponseWriter, r *http.Request) { 52 ch := QueryLogger.Subscribe("querylogz") 53 defer QueryLogger.Unsubscribe(ch) 54 querylogzHandler(ch, w, r) 55 }) 56 57 http.HandleFunc(QueryzHandler, func(w http.ResponseWriter, r *http.Request) { 58 queryzHandler(vtg.executor, w, r) 59 }) 60 61 if queryLogToFile != "" { 62 _, err := QueryLogger.LogToFile(queryLogToFile, streamlog.GetFormatter(QueryLogger)) 63 if err != nil { 64 return err 65 } 66 } 67 68 return nil 69 }