func main() {
flag.Parse()
// Set up profiling, if requested.
if cpuprofile != "" {
log.Info("Profiling enabled")
f, err := os.Create(cpuprofile)
if err != nil {
log.Errorf("Unable to create path: %s", err.Error())
}
defer closeFile(f)
err = pprof.StartCPUProfile(f)
if err != nil {
log.Errorf("Unable to start CPU Profile: %s", err.Error())
}
defer pprof.StopCPUProfile()
}
// Set logging
log.SetLevel(logLevel)
if logFile != "stdout" {
f := createFile(logFile)
defer closeFile(f)
log.Infof("Redirecting logging to %s", logFile)
log.SetOutput(f)
}
// Set the data directory.
if flag.NArg() == 0 {
flag.Usage()
println("Data path argument required")
log.Error("No data path supplied -- aborting")
os.Exit(1)
}
dataPath := flag.Arg(0)
createDir(dataPath)
s := server.NewServer(dataPath, dbfile, snapAfter, host, port)
go func() {
log.Error(s.ListenAndServe(join).Error())
}()
if !disableReporting {
reportLaunch()
}
terminate := make(chan os.Signal, 1)
signal.Notify(terminate, os.Interrupt)
<-terminate
log.Info("rqlite server stopped")
}
// NewServer creates a new server.
func NewServer(dataDir string, dbfile string, snapAfter int, host string, port int) *Server {
dbPath := path.Join(dataDir, dbfile)
// Raft requires randomness.
rand.Seed(time.Now().UnixNano())
log.Info("Raft random seed initialized")
// Setup commands.
raft.RegisterCommand(&command.ExecuteCommand{})
raft.RegisterCommand(&command.TransactionExecuteCommandSet{})
log.Info("Raft commands registered")
s := &Server{
host: host,
port: port,
path: dataDir,
dbPath: dbPath,
db: db.New(dbPath),
snapConf: &SnapshotConf{snapshotAfter: uint64(snapAfter)},
metrics: NewMetrics(),
diagnostics: NewDiagnostics(),
router: mux.NewRouter(),
}
// Read existing name or generate a new one.
if b, err := ioutil.ReadFile(filepath.Join(dataDir, "name")); err == nil {
s.name = string(b)
} else {
s.name = fmt.Sprintf("%07x", rand.Int())[0:7]
if err = ioutil.WriteFile(filepath.Join(dataDir, "name"), []byte(s.name), 0644); err != nil {
panic(err)
}
}
return s
}
func (s *Server) writeHandler(w http.ResponseWriter, req *http.Request) {
s.mutex.Lock()
defer s.mutex.Unlock()
if s.raftServer.State() != "leader" {
s.leaderRedirect(w, req)
return
}
log.Tracef("writeHandler for URL: %s", req.URL)
s.metrics.executeReceived.Inc(1)
currentIndex := s.raftServer.CommitIndex()
count := currentIndex - s.snapConf.lastIndex
if uint64(count) > s.snapConf.snapshotAfter {
log.Info("Committed log entries snapshot threshold reached, starting snapshot")
err := s.raftServer.TakeSnapshot()
s.logSnapshot(err, currentIndex, count)
s.snapConf.lastIndex = currentIndex
s.metrics.snapshotCreated.Inc(1)
}
// Read the value from the POST body.
b, err := ioutil.ReadAll(req.Body)
if err != nil {
log.Tracef("Bad HTTP request: %s", err.Error())
s.metrics.executeFail.Inc(1)
w.WriteHeader(http.StatusBadRequest)
return
}
stmts := strings.Split(string(b), ";")
if stmts[len(stmts)-1] == "" {
stmts = stmts[:len(stmts)-1]
}
log.Tracef("Execute statement contains %d commands", len(stmts))
if len(stmts) == 0 {
log.Trace("No database execute commands supplied")
s.metrics.executeFail.Inc(1)
w.WriteHeader(http.StatusBadRequest)
return
}
transaction, _ := isTransaction(req)
startTime := time.Now()
failures, err := s.execute(transaction, stmts)
if err != nil {
log.Errorf("Database mutation failed: %s", err.Error())
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
duration := time.Since(startTime)
wr := StmtResponse{Failures: failures}
if e, _ := isExplain(req); e {
wr.Time = duration.String()
}
pretty, _ := isPretty(req)
if pretty {
b, err = json.MarshalIndent(wr, "", " ")
} else {
b, err = json.Marshal(wr)
}
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
} else {
_, err = w.Write([]byte(b))
if err != nil {
log.Errorf("Error writting JSON data: %s", err.Error())
}
}
}
// ListenAndServe starts the server.
func (s *Server) ListenAndServe(leader string) error {
var err error
log.Infof("Initializing Raft Server: %s", s.path)
// Initialize and start Raft server.
transporter := raft.NewHTTPTransporter("/raft", 200*time.Millisecond)
stateMachine := NewDbStateMachine(s.dbPath)
s.raftServer, err = raft.NewServer(s.name, s.path, transporter, stateMachine, s.db, "")
if err != nil {
log.Errorf("Failed to create new Raft server: %s", err.Error())
return err
}
log.Info("Loading latest snapshot, if any, from disk")
if err := s.raftServer.LoadSnapshot(); err != nil && os.IsNotExist(err) {
log.Info("no snapshot found")
} else if err != nil {
log.Errorf("Error loading snapshot: %s", err.Error())
}
transporter.Install(s.raftServer, s)
if err := s.raftServer.Start(); err != nil {
log.Errorf("Error starting raft server: %s", err.Error())
}
if leader != "" {
// Join to leader if specified.
log.Infof("Attempting to join leader at %s", leader)
if !s.raftServer.IsLogEmpty() {
log.Error("Cannot join with an existing log")
return errors.New("Cannot join with an existing log")
}
if err := s.Join(leader); err != nil {
log.Errorf("Failed to join leader: %s", err.Error())
return err
}
} else if s.raftServer.IsLogEmpty() {
// Initialize the server by joining itself.
log.Info("Initializing new cluster")
_, err := s.raftServer.Do(&raft.DefaultJoinCommand{
Name: s.raftServer.Name(),
ConnectionString: s.connectionString(),
})
if err != nil {
log.Errorf("Failed to join to self: %s", err.Error())
}
} else {
log.Info("Recovered from log")
}
log.Info("Initializing HTTP server")
// Initialize and start HTTP server.
s.httpServer = &http.Server{
Addr: fmt.Sprintf(":%d", s.port),
Handler: s.router,
}
s.router.HandleFunc("/statistics", s.serveStatistics).Methods("GET")
s.router.HandleFunc("/diagnostics", s.serveDiagnostics).Methods("GET")
s.router.HandleFunc("/raft", s.serveRaftInfo).Methods("GET")
s.router.HandleFunc("/db", s.readHandler).Methods("GET")
s.router.HandleFunc("/db", s.writeHandler).Methods("POST")
s.router.HandleFunc("/join", s.joinHandler).Methods("POST")
log.Infof("Listening at %s", s.connectionString())
return s.httpServer.ListenAndServe()
}