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main.go
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main.go
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// Copyright (c) 2014 Couchbase, 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, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language
// governing permissions and limitations under the License.
package main
import (
"expvar"
"flag"
"fmt"
"io/ioutil"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"runtime"
"runtime/pprof"
"strings"
"github.com/gorilla/mux"
bleveHttp "github.com/blevesearch/bleve/http"
log "github.com/couchbaselabs/clog"
"github.com/couchbaselabs/go-couchbase"
)
var bindAddr = flag.String("addr", ":8095",
"http listen [address]:port")
var dataDir = flag.String("dataDir", "data",
"directory for index data")
var logFlags = flag.String("logFlags", "",
"comma-separated clog flags, to control logging")
var staticDir = flag.String("staticDir", "static",
"directory for static web UI content")
var staticEtag = flag.String("staticEtag", "",
"static etag value")
var server = flag.String("server", "",
"url to couchbase server, example: http://localhost:8091")
var wanted = flag.Bool("wanted", false,
"force this node to be wanted as part of the cluster")
var cfgProvider = flag.String("cfgProvider", "simple",
"provider/connection to cluster config")
var expvars = expvar.NewMap("stats")
func init() {
expvar.Publish("cbft", expvars)
expvars.Set("indexes", bleveHttp.IndexStats())
}
func main() {
flag.Parse()
go dumpOnSignalForPlatform()
log.Printf("%s started", os.Args[0])
if *logFlags != "" {
log.ParseLogFlag(*logFlags)
}
flag.VisitAll(func(f *flag.Flag) { log.Printf(" -%s=%s\n", f.Name, f.Value) })
log.Printf(" GOMAXPROCS=%d", runtime.GOMAXPROCS(-1))
// TODO: If cfg goes down, should we stop? How do we reconnect?
cfg, err := MainCfg(*cfgProvider, *dataDir)
if err != nil {
log.Fatalf("error: could not start cfg, cfgProvider: %s, err: %v",
*cfgProvider, err)
return
}
uuid, err := MainUUID(*dataDir)
if err != nil {
log.Fatalf(fmt.Sprintf("%v", err))
return
}
router, err := MainStart(cfg, uuid, *bindAddr, *dataDir,
*staticDir, *server, *wanted)
if err != nil {
log.Fatal(err)
}
http.Handle("/", router)
log.Printf("listening on: %v", *bindAddr)
log.Fatal(http.ListenAndServe(*bindAddr, nil))
}
func MainUUID(dataDir string) (string, error) {
uuid := NewUUID()
uuidPath := dataDir + string(os.PathSeparator) + "cbft.uuid"
uuidBuf, err := ioutil.ReadFile(uuidPath)
if err == nil {
uuid = strings.TrimSpace(string(uuidBuf))
if uuid == "" {
return "", fmt.Errorf("error: could not parse uuidPath: %s", uuidPath)
}
log.Printf("manager uuid: %s", uuid)
log.Printf("manager uuid was reloaded")
} else {
log.Printf("manager uuid: %s", uuid)
log.Printf("manager uuid was generated")
}
err = ioutil.WriteFile(uuidPath, []byte(uuid), 0600)
if err != nil {
return "", fmt.Errorf("error: could not write uuidPath: %s", uuidPath)
}
return uuid, nil
}
func MainStart(cfg Cfg, uuid, bindAddr, dataDir, staticDir, server string, wanted bool) (
*mux.Router, error) {
if server == "" {
return nil, fmt.Errorf("error: server URL required (-server)")
}
_, err := couchbase.Connect(server)
if err != nil {
return nil, fmt.Errorf("error: could not connect to server URL: %s, err: %v",
server, err)
}
mgr := NewManager(VERSION, cfg, uuid, bindAddr, dataDir, server, &MainHandlers{})
if err = mgr.Start(wanted); err != nil {
return nil, err
}
return NewManagerRESTRouter(mgr, staticDir)
}
type MainHandlers struct{}
func (meh *MainHandlers) OnRegisterPIndex(pindex *PIndex) {
bleveHttp.RegisterIndexName(pindex.Name, pindex.BIndex)
}
func (meh *MainHandlers) OnUnregisterPIndex(pindex *PIndex) {
bleveHttp.UnregisterIndexByName(pindex.Name)
}
func dumpOnSignal(signals ...os.Signal) {
c := make(chan os.Signal, 1)
signal.Notify(c, signals...)
for _ = range c {
pprof.Lookup("goroutine").WriteTo(os.Stderr, 1)
}
}