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server.go
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server.go
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// Copyright 2012-2014 Apcera Inc. All rights reserved.
package server
import (
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"os/signal"
"strconv"
"sync"
"time"
// Allow dynamic profiling.
_ "net/http/pprof"
"github.com/apcera/gnatsd/sublist"
)
// Info is the information sent to clients to help them understand information
// about this server.
type Info struct {
ID string `json:"server_id"`
Version string `json:"version"`
Host string `json:"host"`
Port int `json:"port"`
AuthRequired bool `json:"auth_required"`
SslRequired bool `json:"ssl_required"`
MaxPayload int `json:"max_payload"`
}
// Server is our main struct.
type Server struct {
mu sync.Mutex
info Info
infoJSON []byte
sl *sublist.Sublist
gcid uint64
opts *Options
trace bool
debug bool
running bool
listener net.Listener
clients map[uint64]*client
routes map[uint64]*client
remotes map[string]*client
done chan bool
start time.Time
http net.Listener
stats
routeListener net.Listener
grid uint64
routeInfo Info
routeInfoJSON []byte
rcQuit chan bool
}
type stats struct {
inMsgs int64
outMsgs int64
inBytes int64
outBytes int64
}
// New will setup a new server struct after parsing the options.
func New(opts *Options) *Server {
processOptions(opts)
info := Info{
ID: genID(),
Version: VERSION,
Host: opts.Host,
Port: opts.Port,
AuthRequired: false,
SslRequired: false,
MaxPayload: MAX_PAYLOAD_SIZE,
}
// Check for Auth items
if opts.Username != "" || opts.Authorization != "" {
info.AuthRequired = true
}
s := &Server{
info: info,
sl: sublist.New(),
opts: opts,
debug: opts.Debug,
trace: opts.Trace,
done: make(chan bool, 1),
start: time.Now(),
}
s.mu.Lock()
defer s.mu.Unlock()
// Setup logging with flags
s.LogInit()
// For tracking clients
s.clients = make(map[uint64]*client)
// For tracking routes and their remote ids
s.routes = make(map[uint64]*client)
s.remotes = make(map[string]*client)
// Used to kick out all of the route
// connect Go routines.
s.rcQuit = make(chan bool)
// Generate the info json
b, err := json.Marshal(s.info)
if err != nil {
Fatalf("Error marshalling INFO JSON: %+v\n", err)
}
s.infoJSON = []byte(fmt.Sprintf("INFO %s %s", b, CR_LF))
s.handleSignals()
Logf("Starting gnatsd version %s", VERSION)
s.running = true
return s
}
// PrintAndDie is exported for access in other packages.
func PrintAndDie(msg string) {
fmt.Fprintf(os.Stderr, "%s\n", msg)
os.Exit(1)
}
// PrintServerAndExit will print our version and exit.
func PrintServerAndExit() {
fmt.Printf("gnatsd version %s\n", VERSION)
os.Exit(0)
}
// Signal Handling
func (s *Server) handleSignals() {
if s.opts.NoSigs {
return
}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
Debugf("Trapped Signal; %v", sig)
// FIXME, trip running?
Log("Server Exiting..")
os.Exit(0)
}
}()
}
// Protected check on running state
func (s *Server) isRunning() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.running
}
func (s *Server) logPid() {
pidStr := strconv.Itoa(os.Getpid())
err := ioutil.WriteFile(s.opts.PidFile, []byte(pidStr), 0660)
if err != nil {
PrintAndDie(fmt.Sprintf("Could not write pidfile: %v\n", err))
}
}
// Start up the server, this will block.
// Start via a Go routine if needed.
func (s *Server) Start() {
// Log the pid to a file
if s.opts.PidFile != _EMPTY_ {
s.logPid()
}
// Start up the http server if needed.
if s.opts.HTTPPort != 0 {
s.StartHTTPMonitoring()
}
// Start up routing as well if needed.
if s.opts.ClusterPort != 0 {
s.StartRouting()
}
// Pprof http endpoint for the profiler.
if s.opts.ProfPort != 0 {
s.StartProfiler()
}
// Wait for clients.
s.AcceptLoop()
}
// Shutdown will shutdown the server instance by kicking out the AcceptLoop
// and closing all associated clients.
func (s *Server) Shutdown() {
s.mu.Lock()
// Prevent issues with multiple calls.
if !s.running {
s.mu.Unlock()
return
}
s.running = false
conns := make(map[uint64]*client)
// Copy off the clients
for i, c := range s.clients {
conns[i] = c
}
// Copy off the routes
for i, r := range s.routes {
conns[i] = r
}
// Number of done channel responses we expect.
doneExpected := 0
// Kick client AcceptLoop()
if s.listener != nil {
doneExpected++
s.listener.Close()
s.listener = nil
}
// Kick route AcceptLoop()
if s.routeListener != nil {
doneExpected++
s.routeListener.Close()
s.routeListener = nil
}
// Kick HTTP monitoring if its running
if s.http != nil {
doneExpected++
s.http.Close()
s.http = nil
}
// Release the solicited routes connect go routines.
close(s.rcQuit)
s.mu.Unlock()
// Close client and route connections
for _, c := range conns {
c.closeConnection()
}
// Block until the accept loops exit
for doneExpected > 0 {
<-s.done
doneExpected--
}
}
// AcceptLoop is exported for easier testing.
func (s *Server) AcceptLoop() {
hp := fmt.Sprintf("%s:%d", s.opts.Host, s.opts.Port)
Logf("Listening for client connections on %s", hp)
l, e := net.Listen("tcp", hp)
if e != nil {
Fatalf("Error listening on port: %d - %v", s.opts.Port, e)
return
}
Logf("gnatsd is ready")
// Setup state that can enable shutdown
s.mu.Lock()
s.listener = l
s.mu.Unlock()
// Write resolved port back to options.
_, port, err := net.SplitHostPort(l.Addr().String())
if err != nil {
Fatalf("Error parsing server address (%s): %s", l.Addr().String(), e)
return
}
portNum, err := strconv.Atoi(port)
if err != nil {
Fatalf("Error parsing server address (%s): %s", l.Addr().String(), e)
return
}
s.opts.Port = portNum
tmpDelay := ACCEPT_MIN_SLEEP
for s.isRunning() {
conn, err := l.Accept()
if err != nil {
if ne, ok := err.(net.Error); ok && ne.Temporary() {
Debug("Temporary Client Accept Error(%v), sleeping %dms",
ne, tmpDelay/time.Millisecond)
time.Sleep(tmpDelay)
tmpDelay *= 2
if tmpDelay > ACCEPT_MAX_SLEEP {
tmpDelay = ACCEPT_MAX_SLEEP
}
} else if s.isRunning() {
Logf("Accept error: %v", err)
}
continue
}
tmpDelay = ACCEPT_MIN_SLEEP
s.createClient(conn)
}
Log("Server Exiting..")
s.done <- true
}
// StartProfiler is called to enable dynamic profiling.
func (s *Server) StartProfiler() {
Logf("Starting profiling on http port %d", s.opts.ProfPort)
hp := fmt.Sprintf("%s:%d", s.opts.Host, s.opts.ProfPort)
go func() {
Log(http.ListenAndServe(hp, nil))
}()
}
// StartHTTPMonitoring will enable the HTTP monitoring port.
func (s *Server) StartHTTPMonitoring() {
Logf("Starting http monitor on port %d", s.opts.HTTPPort)
hp := fmt.Sprintf("%s:%d", s.opts.Host, s.opts.HTTPPort)
l, err := net.Listen("tcp", hp)
if err != nil {
Fatalf("Can't listen to the monitor port: %v", err)
}
mux := http.NewServeMux()
// Varz
mux.HandleFunc("/varz", s.HandleVarz)
// Connz
mux.HandleFunc("/connz", s.HandleConnz)
srv := &http.Server{
Addr: hp,
Handler: mux,
ReadTimeout: 2 * time.Second,
WriteTimeout: 2 * time.Second,
MaxHeaderBytes: 1 << 20,
}
s.http = l
go func() {
srv.Serve(s.http)
srv.Handler = nil
s.done <- true
}()
}
func (s *Server) createClient(conn net.Conn) *client {
c := &client{srv: s, nc: conn, opts: defaultOpts}
// Grab lock
c.mu.Lock()
// Initialize
c.initClient()
Debug("Client connection created", clientConnStr(c.nc), c.cid)
// Send our information.
s.sendInfo(c)
// Check for Auth
if s.info.AuthRequired {
ttl := secondsToDuration(s.opts.AuthTimeout)
c.setAuthTimer(ttl)
}
// Unlock to register
c.mu.Unlock()
// Register with the server.
s.mu.Lock()
s.clients[c.cid] = c
s.mu.Unlock()
return c
}
// Assume the lock is held upon entry.
func (s *Server) sendInfo(c *client) {
switch c.typ {
case CLIENT:
c.nc.Write(s.infoJSON)
case ROUTER:
c.nc.Write(s.routeInfoJSON)
}
}
func (s *Server) checkClientAuth(c *client) bool {
if !s.info.AuthRequired {
return true
}
// We require auth here, check the client
// Authorization tokens trump username/password
if s.opts.Authorization != "" {
return s.opts.Authorization == c.opts.Authorization
} else if s.opts.Username != c.opts.Username ||
s.opts.Password != c.opts.Password {
return false
}
return true
}
func (s *Server) checkRouterAuth(c *client) bool {
if !s.routeInfo.AuthRequired {
return true
}
if s.opts.ClusterUsername != c.opts.Username ||
s.opts.ClusterPassword != c.opts.Password {
return false
}
return true
}
// Check auth and return boolean indicating if client is ok
func (s *Server) checkAuth(c *client) bool {
switch c.typ {
case CLIENT:
return s.checkClientAuth(c)
case ROUTER:
return s.checkRouterAuth(c)
default:
return false
}
}
// Remove a client or route from our internal accounting.
func (s *Server) removeClient(c *client) {
c.mu.Lock()
cid := c.cid
typ := c.typ
c.mu.Unlock()
s.mu.Lock()
switch typ {
case CLIENT:
delete(s.clients, cid)
case ROUTER:
delete(s.routes, cid)
if c.route != nil {
rc, ok := s.remotes[c.route.remoteID]
// Only delete it if it is us..
if ok && c == rc {
delete(s.remotes, c.route.remoteID)
}
}
}
s.mu.Unlock()
}
/////////////////////////////////////////////////////////////////
// These are some helpers for accounting in functional tests.
/////////////////////////////////////////////////////////////////
// NumRoutes will report the number of registered routes.
func (s *Server) NumRoutes() int {
s.mu.Lock()
defer s.mu.Unlock()
return len(s.routes)
}
// NumRemotes will report number of registered remotes.
func (s *Server) NumRemotes() int {
s.mu.Lock()
defer s.mu.Unlock()
return len(s.remotes)
}
// NumClients will report the number of registered clients.
func (s *Server) NumClients() int {
s.mu.Lock()
defer s.mu.Unlock()
return len(s.clients)
}
// NumSubscriptions will report how many subscriptions are active.
func (s *Server) NumSubscriptions() uint32 {
s.mu.Lock()
defer s.mu.Unlock()
stats := s.sl.Stats()
return stats.NumSubs
}
// Addr will return the net.Addr object for the current listener.
func (s *Server) Addr() net.Addr {
s.mu.Lock()
defer s.mu.Unlock()
if s.listener == nil {
return nil
}
return s.listener.Addr()
}