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server.go
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server.go
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package server
import (
"crypto/tls"
"encoding/json"
"fmt"
"net"
"net/http"
"net/url"
"strings"
"time"
etcdErr "github.com/coreos/etcd/error"
"github.com/coreos/etcd/log"
"github.com/coreos/etcd/mod"
"github.com/coreos/etcd/server/v1"
"github.com/coreos/etcd/server/v2"
"github.com/coreos/etcd/store"
_ "github.com/coreos/etcd/store/v2"
"github.com/coreos/go-raft"
"github.com/gorilla/mux"
)
// This is the default implementation of the Server interface.
type Server struct {
http.Server
peerServer *PeerServer
registry *Registry
listener net.Listener
store store.Store
name string
url string
tlsConf *TLSConfig
tlsInfo *TLSInfo
corsOrigins map[string]bool
}
// Creates a new Server.
func New(name string, urlStr string, listenHost string, tlsConf *TLSConfig, tlsInfo *TLSInfo, peerServer *PeerServer, registry *Registry, store store.Store) *Server {
s := &Server{
Server: http.Server{
Handler: mux.NewRouter(),
TLSConfig: &tlsConf.Server,
Addr: listenHost,
},
name: name,
store: store,
registry: registry,
url: urlStr,
tlsConf: tlsConf,
tlsInfo: tlsInfo,
peerServer: peerServer,
}
// Install the routes.
s.handleFunc("/version", s.GetVersionHandler).Methods("GET")
s.installV1()
s.installV2()
s.installMod()
return s
}
// The current state of the server in the cluster.
func (s *Server) State() string {
return s.peerServer.RaftServer().State()
}
// The node name of the leader in the cluster.
func (s *Server) Leader() string {
return s.peerServer.RaftServer().Leader()
}
// The current Raft committed index.
func (s *Server) CommitIndex() uint64 {
return s.peerServer.RaftServer().CommitIndex()
}
// The current Raft term.
func (s *Server) Term() uint64 {
return s.peerServer.RaftServer().Term()
}
// The server URL.
func (s *Server) URL() string {
return s.url
}
// Retrives the Peer URL for a given node name.
func (s *Server) PeerURL(name string) (string, bool) {
return s.registry.PeerURL(name)
}
// Returns a reference to the Store.
func (s *Server) Store() store.Store {
return s.store
}
func (s *Server) installV1() {
s.handleFuncV1("/v1/keys/{key:.*}", v1.GetKeyHandler).Methods("GET")
s.handleFuncV1("/v1/keys/{key:.*}", v1.SetKeyHandler).Methods("POST", "PUT")
s.handleFuncV1("/v1/keys/{key:.*}", v1.DeleteKeyHandler).Methods("DELETE")
s.handleFuncV1("/v1/watch/{key:.*}", v1.WatchKeyHandler).Methods("GET", "POST")
s.handleFunc("/v1/leader", s.GetLeaderHandler).Methods("GET")
s.handleFunc("/v1/machines", s.GetMachinesHandler).Methods("GET")
s.handleFunc("/v1/stats/self", s.GetStatsHandler).Methods("GET")
s.handleFunc("/v1/stats/leader", s.GetLeaderStatsHandler).Methods("GET")
s.handleFunc("/v1/stats/store", s.GetStoreStatsHandler).Methods("GET")
}
func (s *Server) installV2() {
s.handleFuncV2("/v2/keys/{key:.*}", v2.GetHandler).Methods("GET")
s.handleFuncV2("/v2/keys/{key:.*}", v2.PostHandler).Methods("POST")
s.handleFuncV2("/v2/keys/{key:.*}", v2.PutHandler).Methods("PUT")
s.handleFuncV2("/v2/keys/{key:.*}", v2.DeleteHandler).Methods("DELETE")
s.handleFunc("/v2/leader", s.GetLeaderHandler).Methods("GET")
s.handleFunc("/v2/machines", s.GetMachinesHandler).Methods("GET")
s.handleFunc("/v2/stats/self", s.GetStatsHandler).Methods("GET")
s.handleFunc("/v2/stats/leader", s.GetLeaderStatsHandler).Methods("GET")
s.handleFunc("/v2/stats/store", s.GetStoreStatsHandler).Methods("GET")
s.handleFunc("/v2/speedTest", s.SpeedTestHandler).Methods("GET")
}
func (s *Server) installMod() {
r := s.Handler.(*mux.Router)
r.PathPrefix("/mod").Handler(http.StripPrefix("/mod", mod.HttpHandler()))
}
// Adds a v1 server handler to the router.
func (s *Server) handleFuncV1(path string, f func(http.ResponseWriter, *http.Request, v1.Server) error) *mux.Route {
return s.handleFunc(path, func(w http.ResponseWriter, req *http.Request) error {
return f(w, req, s)
})
}
// Adds a v2 server handler to the router.
func (s *Server) handleFuncV2(path string, f func(http.ResponseWriter, *http.Request, v2.Server) error) *mux.Route {
return s.handleFunc(path, func(w http.ResponseWriter, req *http.Request) error {
return f(w, req, s)
})
}
// Adds a server handler to the router.
func (s *Server) handleFunc(path string, f func(http.ResponseWriter, *http.Request) error) *mux.Route {
r := s.Handler.(*mux.Router)
// Wrap the standard HandleFunc interface to pass in the server reference.
return r.HandleFunc(path, func(w http.ResponseWriter, req *http.Request) {
// Log request.
log.Debugf("[recv] %s %s %s [%s]", req.Method, s.url, req.URL.Path, req.RemoteAddr)
// Write CORS header.
if s.OriginAllowed("*") {
w.Header().Add("Access-Control-Allow-Origin", "*")
} else if origin := req.Header.Get("Origin"); s.OriginAllowed(origin) {
w.Header().Add("Access-Control-Allow-Origin", origin)
}
// Execute handler function and return error if necessary.
if err := f(w, req); err != nil {
if etcdErr, ok := err.(*etcdErr.Error); ok {
log.Debug("Return error: ", (*etcdErr).Error())
etcdErr.Write(w)
} else {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
})
}
// Start to listen and response etcd client command
func (s *Server) ListenAndServe() error {
log.Infof("etcd server [name %s, listen on %s, advertised url %s]", s.name, s.Server.Addr, s.url)
if s.tlsConf.Scheme == "http" {
return s.listenAndServe()
} else {
return s.listenAndServeTLS(s.tlsInfo.CertFile, s.tlsInfo.KeyFile)
}
}
// Overridden version of net/http added so we can manage the listener.
func (s *Server) listenAndServe() error {
addr := s.Server.Addr
if addr == "" {
addr = ":http"
}
l, e := net.Listen("tcp", addr)
if e != nil {
return e
}
s.listener = l
return s.Server.Serve(l)
}
// Overridden version of net/http added so we can manage the listener.
func (s *Server) listenAndServeTLS(certFile, keyFile string) error {
addr := s.Server.Addr
if addr == "" {
addr = ":https"
}
config := &tls.Config{}
if s.Server.TLSConfig != nil {
*config = *s.Server.TLSConfig
}
if config.NextProtos == nil {
config.NextProtos = []string{"http/1.1"}
}
var err error
config.Certificates = make([]tls.Certificate, 1)
config.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return err
}
conn, err := net.Listen("tcp", addr)
if err != nil {
return err
}
tlsListener := tls.NewListener(conn, config)
s.listener = tlsListener
return s.Server.Serve(tlsListener)
}
// Stops the server.
func (s *Server) Close() {
if s.listener != nil {
s.listener.Close()
s.listener = nil
}
}
// Dispatch command to the current leader
func (s *Server) Dispatch(c raft.Command, w http.ResponseWriter, req *http.Request) error {
ps := s.peerServer
if ps.raftServer.State() == raft.Leader {
result, err := ps.raftServer.Do(c)
if err != nil {
return err
}
if result == nil {
return etcdErr.NewError(300, "Empty result from raft", s.Store().Index())
}
// response for raft related commands[join/remove]
if b, ok := result.([]byte); ok {
w.WriteHeader(http.StatusOK)
w.Write(b)
return nil
}
var b []byte
if strings.HasPrefix(req.URL.Path, "/v1") {
b, _ = json.Marshal(result.(*store.Event).Response())
w.WriteHeader(http.StatusOK)
} else {
e, _ := result.(*store.Event)
b, _ = json.Marshal(e)
// etcd index should be the same as the event index
// which is also the last modified index of the node
w.Header().Add("X-Etcd-Index", fmt.Sprint(e.Index))
w.Header().Add("X-Raft-Index", fmt.Sprint(s.CommitIndex()))
w.Header().Add("X-Raft-Term", fmt.Sprint(s.Term()))
if e.IsCreated() {
w.WriteHeader(http.StatusCreated)
} else {
w.WriteHeader(http.StatusOK)
}
}
w.Write(b)
return nil
} else {
leader := ps.raftServer.Leader()
// No leader available.
if leader == "" {
return etcdErr.NewError(300, "", s.Store().Index())
}
var url string
switch c.(type) {
case *JoinCommand, *RemoveCommand:
url, _ = ps.registry.PeerURL(leader)
default:
url, _ = ps.registry.ClientURL(leader)
}
redirect(url, w, req)
return nil
}
}
// Sets a comma-delimited list of origins that are allowed.
func (s *Server) AllowOrigins(origins []string) error {
// Construct a lookup of all origins.
m := make(map[string]bool)
for _, v := range origins {
if v != "*" {
if _, err := url.Parse(v); err != nil {
return fmt.Errorf("Invalid CORS origin: %s", err)
}
}
m[v] = true
}
s.corsOrigins = m
return nil
}
// Determines whether the server will allow a given CORS origin.
func (s *Server) OriginAllowed(origin string) bool {
return s.corsOrigins["*"] || s.corsOrigins[origin]
}
// Handler to return the current version of etcd.
func (s *Server) GetVersionHandler(w http.ResponseWriter, req *http.Request) error {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "etcd %s", ReleaseVersion)
return nil
}
// Handler to return the current leader's raft address
func (s *Server) GetLeaderHandler(w http.ResponseWriter, req *http.Request) error {
leader := s.peerServer.RaftServer().Leader()
if leader == "" {
return etcdErr.NewError(etcdErr.EcodeLeaderElect, "", s.Store().Index())
}
w.WriteHeader(http.StatusOK)
url, _ := s.registry.PeerURL(leader)
w.Write([]byte(url))
return nil
}
// Handler to return all the known machines in the current cluster.
func (s *Server) GetMachinesHandler(w http.ResponseWriter, req *http.Request) error {
machines := s.registry.ClientURLs(s.peerServer.RaftServer().Leader(), s.name)
w.WriteHeader(http.StatusOK)
w.Write([]byte(strings.Join(machines, ", ")))
return nil
}
// Retrieves stats on the Raft server.
func (s *Server) GetStatsHandler(w http.ResponseWriter, req *http.Request) error {
w.Write(s.peerServer.Stats())
return nil
}
// Retrieves stats on the leader.
func (s *Server) GetLeaderStatsHandler(w http.ResponseWriter, req *http.Request) error {
if s.peerServer.RaftServer().State() == raft.Leader {
w.Write(s.peerServer.PeerStats())
return nil
}
leader := s.peerServer.RaftServer().Leader()
if leader == "" {
return etcdErr.NewError(300, "", s.Store().Index())
}
hostname, _ := s.registry.ClientURL(leader)
redirect(hostname, w, req)
return nil
}
// Retrieves stats on the leader.
func (s *Server) GetStoreStatsHandler(w http.ResponseWriter, req *http.Request) error {
w.Write(s.store.JsonStats())
return nil
}
// Executes a speed test to evaluate the performance of update replication.
func (s *Server) SpeedTestHandler(w http.ResponseWriter, req *http.Request) error {
count := 1000
c := make(chan bool, count)
for i := 0; i < count; i++ {
go func() {
for j := 0; j < 10; j++ {
c := s.Store().CommandFactory().CreateSetCommand("foo", "bar", time.Unix(0, 0))
s.peerServer.RaftServer().Do(c)
}
c <- true
}()
}
for i := 0; i < count; i++ {
<-c
}
w.WriteHeader(http.StatusOK)
w.Write([]byte("speed test success"))
return nil
}