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http_status.go
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// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"bytes"
"encoding/json"
"fmt"
"net/http"
"net/http/pprof"
"github.com/gorilla/mux"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/terror"
"github.com/pingcap/tidb/util/printer"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
)
const defaultStatusAddr = ":10080"
func (s *Server) startStatusHTTP() {
go s.startHTTPServer()
}
func (s *Server) startHTTPServer() {
router := mux.NewRouter()
router.HandleFunc("/status", s.handleStatus).Name("Status")
// HTTP path for prometheus.
router.Handle("/metrics", prometheus.Handler()).Name("Metrics")
// HTTP path for dump statistics.
router.Handle("/stats/dump/{db}/{table}", s.newStatsHandler()).Name("StatsDump")
router.Handle("/settings", settingsHandler{}).Name("Settings")
router.Handle("/binlog/recover", binlogRecover{}).Name("BinlogRecover")
tikvHandlerTool := s.newTikvHandlerTool()
router.Handle("/schema", schemaHandler{tikvHandlerTool}).Name("Schema")
router.Handle("/schema/{db}", schemaHandler{tikvHandlerTool})
router.Handle("/schema/{db}/{table}", schemaHandler{tikvHandlerTool})
router.Handle("/tables/{colID}/{colTp}/{colFlag}/{colLen}", valueHandler{})
router.Handle("/ddl/history", ddlHistoryJobHandler{tikvHandlerTool}).Name("DDL_History")
router.Handle("/ddl/owner/resign", ddlResignOwnerHandler{tikvHandlerTool.store.(kv.Storage)}).Name("DDL_Owner_Resign")
// HTTP path for get server info.
router.Handle("/info", serverInfoHandler{tikvHandlerTool}).Name("Info")
router.Handle("/info/all", allServerInfoHandler{tikvHandlerTool}).Name("InfoALL")
if s.cfg.Store == "tikv" {
// HTTP path for tikv.
router.Handle("/tables/{db}/{table}/regions", tableHandler{tikvHandlerTool, opTableRegions})
router.Handle("/tables/{db}/{table}/scatter", tableHandler{tikvHandlerTool, opTableScatter})
router.Handle("/tables/{db}/{table}/stop-scatter", tableHandler{tikvHandlerTool, opStopTableScatter})
router.Handle("/tables/{db}/{table}/disk-usage", tableHandler{tikvHandlerTool, opTableDiskUsage})
router.Handle("/regions/meta", regionHandler{tikvHandlerTool}).Name("RegionsMeta")
router.Handle("/regions/{regionID}", regionHandler{tikvHandlerTool})
router.Handle("/mvcc/key/{db}/{table}/{handle}", mvccTxnHandler{tikvHandlerTool, opMvccGetByKey})
router.Handle("/mvcc/txn/{startTS}/{db}/{table}", mvccTxnHandler{tikvHandlerTool, opMvccGetByTxn})
router.Handle("/mvcc/hex/{hexKey}", mvccTxnHandler{tikvHandlerTool, opMvccGetByHex})
router.Handle("/mvcc/index/{db}/{table}/{index}/{handle}", mvccTxnHandler{tikvHandlerTool, opMvccGetByIdx})
}
addr := fmt.Sprintf(":%d", s.cfg.Status.StatusPort)
if s.cfg.Status.StatusPort == 0 {
addr = defaultStatusAddr
}
serverMux := http.NewServeMux()
serverMux.Handle("/", router)
serverMux.HandleFunc("/debug/pprof/", pprof.Index)
serverMux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
serverMux.HandleFunc("/debug/pprof/profile", pprof.Profile)
serverMux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
serverMux.HandleFunc("/debug/pprof/trace", pprof.Trace)
var (
err error
httpRouterPage bytes.Buffer
pathTemplate string
)
httpRouterPage.WriteString("<html><head><title>TiDB Status and Metrics Report</title></head><body><h1>TiDB Status and Metrics Report</h1><table>")
err = router.Walk(func(route *mux.Route, router *mux.Router, ancestors []*mux.Route) error {
pathTemplate, err = route.GetPathTemplate()
if err != nil {
log.Error("Get http router path error ", err)
}
name := route.GetName() //If the name attribute is not set, GetName returns ""
if name != "" && err == nil {
httpRouterPage.WriteString("<tr><td><a href='" + pathTemplate + "'>" + name + "</a><td></tr>")
}
return nil
})
if err != nil {
log.Error("Generate root error ", err)
}
httpRouterPage.WriteString("<tr><td><a href='/debug/pprof/'>Debug</a><td></tr>")
httpRouterPage.WriteString("</table></body></html>")
router.HandleFunc("/", func(responseWriter http.ResponseWriter, request *http.Request) {
_, err = responseWriter.Write([]byte(httpRouterPage.String()))
if err != nil {
log.Error("Http index page error ", err)
}
})
log.Infof("Listening on %v for status and metrics report.", addr)
s.statusServer = &http.Server{Addr: addr, Handler: CorsHandler{handler: serverMux, cfg: s.cfg}}
if len(s.cfg.Security.ClusterSSLCA) != 0 {
err = s.statusServer.ListenAndServeTLS(s.cfg.Security.ClusterSSLCert, s.cfg.Security.ClusterSSLKey)
} else {
err = s.statusServer.ListenAndServe()
}
if err != nil {
log.Info(err)
}
}
// status of TiDB.
type status struct {
Connections int `json:"connections"`
Version string `json:"version"`
GitHash string `json:"git_hash"`
}
func (s *Server) handleStatus(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-Type", "application/json")
st := status{
Connections: s.ConnectionCount(),
Version: mysql.ServerVersion,
GitHash: printer.TiDBGitHash,
}
js, err := json.Marshal(st)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
log.Error("Encode json error", err)
} else {
_, err = w.Write(js)
terror.Log(errors.Trace(err))
}
}