// TODO: change etcdserver to raft interface when we have it.
// add test for healthHeadler when we have the interface ready.
func healthHandler(server *etcdserver.EtcdServer) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if !allowMethod(w, r.Method, "GET") {
return
}
if uint64(server.Leader()) == raft.None {
http.Error(w, `{"health": "false"}`, http.StatusServiceUnavailable)
return
}
// wait for raft's progress
index := server.Index()
for i := 0; i < 3; i++ {
time.Sleep(250 * time.Millisecond)
if server.Index() > index {
w.WriteHeader(http.StatusOK)
w.Write([]byte(`{"health": "true"}`))
return
}
}
http.Error(w, `{"health": "false"}`, http.StatusServiceUnavailable)
return
}
}
// startEtcd launches the etcd server and HTTP handlers for client/server communication.
func startEtcd(cfg *config) (<-chan struct{}, error) {
cls, err := setupCluster(cfg)
if err != nil {
return nil, fmt.Errorf("error setting up initial cluster: %v", err)
}
pt, err := transport.NewTimeoutTransport(cfg.peerTLSInfo, rafthttp.DialTimeout, rafthttp.ConnReadTimeout, rafthttp.ConnWriteTimeout)
if err != nil {
return nil, err
}
if !cfg.peerTLSInfo.Empty() {
log.Printf("etcd: peerTLS: %s", cfg.peerTLSInfo)
}
plns := make([]net.Listener, 0)
for _, u := range cfg.lpurls {
var l net.Listener
l, err = transport.NewTimeoutListener(u.Host, u.Scheme, cfg.peerTLSInfo, rafthttp.ConnReadTimeout, rafthttp.ConnWriteTimeout)
if err != nil {
return nil, err
}
urlStr := u.String()
log.Print("etcd: listening for peers on ", urlStr)
defer func() {
if err != nil {
l.Close()
log.Print("etcd: stopping listening for peers on ", urlStr)
}
}()
plns = append(plns, l)
}
if !cfg.clientTLSInfo.Empty() {
log.Printf("etcd: clientTLS: %s", cfg.clientTLSInfo)
}
clns := make([]net.Listener, 0)
for _, u := range cfg.lcurls {
var l net.Listener
l, err = transport.NewKeepAliveListener(u.Host, u.Scheme, cfg.clientTLSInfo)
if err != nil {
return nil, err
}
urlStr := u.String()
log.Print("etcd: listening for client requests on ", urlStr)
defer func() {
if err != nil {
l.Close()
log.Print("etcd: stopping listening for client requests on ", urlStr)
}
}()
clns = append(clns, l)
}
srvcfg := &etcdserver.ServerConfig{
Name: cfg.name,
ClientURLs: cfg.acurls,
PeerURLs: cfg.apurls,
DataDir: cfg.dir,
SnapCount: cfg.snapCount,
MaxSnapFiles: cfg.maxSnapFiles,
MaxWALFiles: cfg.maxWalFiles,
Cluster: cls,
DiscoveryURL: cfg.durl,
DiscoveryProxy: cfg.dproxy,
NewCluster: cfg.isNewCluster(),
ForceNewCluster: cfg.forceNewCluster,
Transport: pt,
TickMs: cfg.TickMs,
ElectionTicks: cfg.electionTicks(),
}
var s *etcdserver.EtcdServer
s, err = etcdserver.NewServer(srvcfg)
if err != nil {
return nil, err
}
s.Start()
osutil.RegisterInterruptHandler(s.Stop)
if cfg.corsInfo.String() != "" {
log.Printf("etcd: cors = %s", cfg.corsInfo)
}
ch := &cors.CORSHandler{
Handler: etcdhttp.NewClientHandler(s),
Info: cfg.corsInfo,
}
ph := etcdhttp.NewPeerHandler(s.Cluster, etcdserver.RaftTimer(s), s.RaftHandler())
// Start the peer server in a goroutine
for _, l := range plns {
go func(l net.Listener) {
log.Fatal(serveHTTP(l, ph, 5*time.Minute))
}(l)
}
// Start a client server goroutine for each listen address
for _, l := range clns {
go func(l net.Listener) {
// read timeout does not work with http close notify
// TODO: https://github.com/golang/go/issues/9524
log.Fatal(serveHTTP(l, ch, 0))
}(l)
}
return s.StopNotify(), nil
}