Merge pull request #127 from xiangli-cmu/master

clean error handling

command.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	etcdErr "github.com/coreos/etcd/error"
 	"github.com/coreos/etcd/store"
 	"github.com/coreos/go-raft"
 	"path"
@@ -147,7 +148,8 @@ func (c *JoinCommand) Apply(raftServer *raft.Server) (interface{}, error) {
 	// check machine number in the cluster
 	num := machineNum()
 	if num == maxClusterSize {
-		return []byte("join fail"), fmt.Errorf(errors[103])
+		debug("Reject join request from ", c.Name)
+		return []byte("join fail"), etcdErr.NewError(103, "")
 	}
 
 	addNameToURL(c.Name, c.RaftURL, c.EtcdURL)

error.go → error/error.go

@@ -1,11 +1,14 @@
-package main
+package error
 
 import (
 	"encoding/json"
+	"net/http"
 )
 
 var errors map[int]string
 
+const ()
+
 func init() {
 	errors = make(map[int]string)
 
@@ -33,17 +36,39 @@ func init() {
 
 }
 
-type jsonError struct {
+type Error struct {
 	ErrorCode int    `json:"errorCode"`
 	Message   string `json:"message"`
 	Cause     string `json:"cause,omitempty"`
 }
 
-func newJsonError(errorCode int, cause string) []byte {
-	b, _ := json.Marshal(jsonError{
+func NewError(errorCode int, cause string) Error {
+	return Error{
 		ErrorCode: errorCode,
 		Message:   errors[errorCode],
 		Cause:     cause,
-	})
-	return b
+	}
+}
+
+func Message(code int) string {
+	return errors[code]
+}
+
+// Only for error interface
+func (e Error) Error() string {
+	return e.Message
+}
+
+func (e Error) toJsonString() string {
+	b, _ := json.Marshal(e)
+	return string(b)
+}
+
+func (e Error) Write(w http.ResponseWriter) {
+	// 3xx is reft internal error
+	if e.ErrorCode/100 == 3 {
+		http.Error(w, e.toJsonString(), http.StatusInternalServerError)
+	} else {
+		http.Error(w, e.toJsonString(), http.StatusBadRequest)
+	}
 }

etcd_handlers.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	etcdErr "github.com/coreos/etcd/error"
 	"github.com/coreos/etcd/store"
 	"github.com/coreos/go-raft"
 	"net/http"
@@ -16,29 +17,42 @@ import (
 func NewEtcdMuxer() *http.ServeMux {
 	// external commands
 	etcdMux := http.NewServeMux()
-	etcdMux.HandleFunc("/"+version+"/keys/", Multiplexer)
-	etcdMux.HandleFunc("/"+version+"/watch/", WatchHttpHandler)
-	etcdMux.HandleFunc("/leader", LeaderHttpHandler)
-	etcdMux.HandleFunc("/machines", MachinesHttpHandler)
-	etcdMux.HandleFunc("/version", VersionHttpHandler)
-	etcdMux.HandleFunc("/stats", StatsHttpHandler)
+	etcdMux.Handle("/"+version+"/keys/", errorHandler(Multiplexer))
+	etcdMux.Handle("/"+version+"/watch/", errorHandler(WatchHttpHandler))
+	etcdMux.Handle("/"+version+"/leader", errorHandler(LeaderHttpHandler))
+	etcdMux.Handle("/"+version+"/machines", errorHandler(MachinesHttpHandler))
+	etcdMux.Handle("/"+version+"/stats", errorHandler(StatsHttpHandler))
+	etcdMux.Handle("/version", errorHandler(VersionHttpHandler))
 	etcdMux.HandleFunc("/test/", TestHttpHandler)
 	return etcdMux
 }
 
+type errorHandler func(http.ResponseWriter, *http.Request) error
+
+func (fn errorHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if e := fn(w, r); e != nil {
+		if etcdErr, ok := e.(etcdErr.Error); ok {
+			debug("Return error: ", etcdErr.Error())
+			etcdErr.Write(w)
+		} else {
+			http.Error(w, e.Error(), http.StatusInternalServerError)
+		}
+	}
+}
+
 // Multiplex GET/POST/DELETE request to corresponding handlers
-func Multiplexer(w http.ResponseWriter, req *http.Request) {
+func Multiplexer(w http.ResponseWriter, req *http.Request) error {
 
 	switch req.Method {
 	case "GET":
-		GetHttpHandler(&w, req)
+		return GetHttpHandler(w, req)
 	case "POST":
-		SetHttpHandler(&w, req)
+		return SetHttpHandler(w, req)
 	case "DELETE":
-		DeleteHttpHandler(&w, req)
+		return DeleteHttpHandler(w, req)
 	default:
 		w.WriteHeader(http.StatusMethodNotAllowed)
-		return
+		return nil
 	}
 }
 
@@ -48,15 +62,11 @@ func Multiplexer(w http.ResponseWriter, req *http.Request) {
 //--------------------------------------
 
 // Set Command Handler
-func SetHttpHandler(w *http.ResponseWriter, req *http.Request) {
+func SetHttpHandler(w http.ResponseWriter, req *http.Request) error {
 	key := req.URL.Path[len("/v1/keys/"):]
 
 	if store.CheckKeyword(key) {
-
-		(*w).WriteHeader(http.StatusBadRequest)
-
-		(*w).Write(newJsonError(400, "Set"))
-		return
+		return etcdErr.NewError(400, "Set")
 	}
 
 	debugf("[recv] POST %v/v1/keys/%s [%s]", e.url, key, req.RemoteAddr)
@@ -64,10 +74,7 @@ func SetHttpHandler(w *http.ResponseWriter, req *http.Request) {
 	value := req.FormValue("value")
 
 	if len(value) == 0 {
-		(*w).WriteHeader(http.StatusBadRequest)
-
-		(*w).Write(newJsonError(200, "Set"))
-		return
+		return etcdErr.NewError(200, "Set")
 	}
 
 	prevValue := req.FormValue("prevValue")
@@ -77,11 +84,7 @@ func SetHttpHandler(w *http.ResponseWriter, req *http.Request) {
 	expireTime, err := durationToExpireTime(strDuration)
 
 	if err != nil {
-
-		(*w).WriteHeader(http.StatusBadRequest)
-
-		(*w).Write(newJsonError(202, "Set"))
-		return
+		return etcdErr.NewError(202, "Set")
 	}
 
 	if len(prevValue) != 0 {
@@ -92,7 +95,7 @@ func SetHttpHandler(w *http.ResponseWriter, req *http.Request) {
 			ExpireTime: expireTime,
 		}
 
-		dispatch(command, w, req, true)
+		return dispatch(command, w, req, true)
 
 	} else {
 		command := &SetCommand{
@@ -101,13 +104,12 @@ func SetHttpHandler(w *http.ResponseWriter, req *http.Request) {
 			ExpireTime: expireTime,
 		}
 
-		dispatch(command, w, req, true)
+		return dispatch(command, w, req, true)
 	}
-
 }
 
 // Delete Handler
-func DeleteHttpHandler(w *http.ResponseWriter, req *http.Request) {
+func DeleteHttpHandler(w http.ResponseWriter, req *http.Request) error {
 	key := req.URL.Path[len("/v1/keys/"):]
 
 	debugf("[recv] DELETE %v/v1/keys/%s [%s]", e.url, key, req.RemoteAddr)
@@ -116,76 +118,40 @@ func DeleteHttpHandler(w *http.ResponseWriter, req *http.Request) {
 		Key: key,
 	}
 
-	dispatch(command, w, req, true)
+	return dispatch(command, w, req, true)
 }
 
 // Dispatch the command to leader
-func dispatch(c Command, w *http.ResponseWriter, req *http.Request, etcd bool) {
+func dispatch(c Command, w http.ResponseWriter, req *http.Request, etcd bool) error {
 
 	if r.State() == raft.Leader {
 		if body, err := r.Do(c); err != nil {
-
-			if _, ok := err.(store.NotFoundError); ok {
-				(*w).WriteHeader(http.StatusNotFound)
-				(*w).Write(newJsonError(100, err.Error()))
-				return
-			}
-
-			if _, ok := err.(store.TestFail); ok {
-				(*w).WriteHeader(http.StatusBadRequest)
-				(*w).Write(newJsonError(101, err.Error()))
-				return
-			}
-
-			if _, ok := err.(store.NotFile); ok {
-				(*w).WriteHeader(http.StatusBadRequest)
-				(*w).Write(newJsonError(102, err.Error()))
-				return
-			}
-			if err.Error() == errors[103] {
-				(*w).WriteHeader(http.StatusBadRequest)
-				(*w).Write(newJsonError(103, ""))
-				return
-			}
-			(*w).WriteHeader(http.StatusInternalServerError)
-			(*w).Write(newJsonError(300, err.Error()))
-			return
+			return err
 		} else {
-
 			if body == nil {
-				(*w).WriteHeader(http.StatusNotFound)
-				(*w).Write(newJsonError(300, "Empty result from raft"))
+				return etcdErr.NewError(300, "Empty result from raft")
 			} else {
-				body, ok := body.([]byte)
-				// this should not happen
-				if !ok {
-					panic("wrong type")
-				}
-				(*w).WriteHeader(http.StatusOK)
-				(*w).Write(body)
+				body, _ := body.([]byte)
+				w.WriteHeader(http.StatusOK)
+				w.Write(body)
+				return nil
 			}
-			return
 		}
+
 	} else {
 		leader := r.Leader()
 		// current no leader
 		if leader == "" {
-			(*w).WriteHeader(http.StatusInternalServerError)
-			(*w).Write(newJsonError(300, ""))
-			return
+			return etcdErr.NewError(300, "")
 		}
 
 		// tell the client where is the leader
-
 		path := req.URL.Path
 
 		var url string
 
 		if etcd {
 			etcdAddr, _ := nameToEtcdURL(leader)
-			if etcdAddr == "" {
-				panic(leader)
-			}
 			url = etcdAddr + path
 		} else {
 			raftAddr, _ := nameToRaftURL(leader)
@@ -194,12 +160,10 @@ func dispatch(c Command, w *http.ResponseWriter, req *http.Request, etcd bool) {
 
 		debugf("Redirect to %s", url)
 
-		http.Redirect(*w, req, url, http.StatusTemporaryRedirect)
-		return
+		http.Redirect(w, req, url, http.StatusTemporaryRedirect)
+		return nil
 	}
-	(*w).WriteHeader(http.StatusInternalServerError)
-	(*w).Write(newJsonError(300, ""))
-	return
+	return etcdErr.NewError(300, "")
 }
 
 //--------------------------------------
@@ -210,44 +174,44 @@ func dispatch(c Command, w *http.ResponseWriter, req *http.Request, etcd bool) {
 //--------------------------------------
 
 // Handler to return the current leader's raft address
-func LeaderHttpHandler(w http.ResponseWriter, req *http.Request) {
+func LeaderHttpHandler(w http.ResponseWriter, req *http.Request) error {
 	leader := r.Leader()
 
 	if leader != "" {
 		w.WriteHeader(http.StatusOK)
 		raftURL, _ := nameToRaftURL(leader)
 		w.Write([]byte(raftURL))
+		return nil
 	} else {
-
-		// not likely, but it may happen
-		w.WriteHeader(http.StatusInternalServerError)
-		w.Write(newJsonError(301, ""))
+		return etcdErr.NewError(301, "")
 	}
 }
 
 // Handler to return all the known machines in the current cluster
-func MachinesHttpHandler(w http.ResponseWriter, req *http.Request) {
+func MachinesHttpHandler(w http.ResponseWriter, req *http.Request) error {
 	machines := getMachines()
 
 	w.WriteHeader(http.StatusOK)
 	w.Write([]byte(strings.Join(machines, ", ")))
+	return nil
 }
 
 // Handler to return the current version of etcd
-func VersionHttpHandler(w http.ResponseWriter, req *http.Request) {
+func VersionHttpHandler(w http.ResponseWriter, req *http.Request) error {
 	w.WriteHeader(http.StatusOK)
-	w.Write([]byte(fmt.Sprintf("etcd %s", releaseVersion)))
-	w.Write([]byte(fmt.Sprintf("etcd API %s", version)))
+	fmt.Fprintf(w, "etcd %s", releaseVersion)
+	return nil
 }
 
 // Handler to return the basic stats of etcd
-func StatsHttpHandler(w http.ResponseWriter, req *http.Request) {
+func StatsHttpHandler(w http.ResponseWriter, req *http.Request) error {
 	w.WriteHeader(http.StatusOK)
 	w.Write(etcdStore.Stats())
+	return nil
 }
 
 // Get Handler
-func GetHttpHandler(w *http.ResponseWriter, req *http.Request) {
+func GetHttpHandler(w http.ResponseWriter, req *http.Request) error {
 	key := req.URL.Path[len("/v1/keys/"):]
 
 	debugf("[recv] GET %s/v1/keys/%s [%s]", e.url, key, req.RemoteAddr)
@@ -257,31 +221,19 @@ func GetHttpHandler(w *http.ResponseWriter, req *http.Request) {
 	}
 
 	if body, err := command.Apply(r.Server); err != nil {
-
-		if _, ok := err.(store.NotFoundError); ok {
-			(*w).WriteHeader(http.StatusNotFound)
-			(*w).Write(newJsonError(100, err.Error()))
-			return
-		}
-
-		(*w).WriteHeader(http.StatusInternalServerError)
-		(*w).Write(newJsonError(300, ""))
-
+		return err
 	} else {
-		body, ok := body.([]byte)
-		if !ok {
-			panic("wrong type")
-		}
-
-		(*w).WriteHeader(http.StatusOK)
-		(*w).Write(body)
+		body, _ := body.([]byte)
+		w.WriteHeader(http.StatusOK)
+		w.Write(body)
 
+		return nil
 	}
 
 }
 
 // Watch handler
-func WatchHttpHandler(w http.ResponseWriter, req *http.Request) {
+func WatchHttpHandler(w http.ResponseWriter, req *http.Request) error {
 	key := req.URL.Path[len("/v1/watch/"):]
 
 	command := &WatchCommand{
@@ -300,28 +252,23 @@ func WatchHttpHandler(w http.ResponseWriter, req *http.Request) {
 
 		sinceIndex, err := strconv.ParseUint(string(content), 10, 64)
 		if err != nil {
-			w.WriteHeader(http.StatusBadRequest)
-			w.Write(newJsonError(203, "Watch From Index"))
+			return etcdErr.NewError(203, "Watch From Index")
 		}
 		command.SinceIndex = sinceIndex
 
 	} else {
 		w.WriteHeader(http.StatusMethodNotAllowed)
-		return
+		return nil
 	}
 
 	if body, err := command.Apply(r.Server); err != nil {
-		w.WriteHeader(http.StatusInternalServerError)
-		w.Write(newJsonError(500, key))
+		return etcdErr.NewError(500, key)
 	} else {
 		w.WriteHeader(http.StatusOK)
 
-		body, ok := body.([]byte)
-		if !ok {
-			panic("wrong type")
-		}
-
+		body, _ := body.([]byte)
 		w.Write(body)
+		return nil
 	}
 
 }

raft_handlers.go

@@ -94,16 +94,16 @@ func EtcdURLHttpHandler(w http.ResponseWriter, req *http.Request) {
 }
 
 // Response to the join request
-func JoinHttpHandler(w http.ResponseWriter, req *http.Request) {
+func JoinHttpHandler(w http.ResponseWriter, req *http.Request) error {
 
 	command := &JoinCommand{}
 
 	if err := decodeJsonRequest(req, command); err == nil {
 		debugf("Receive Join Request from %s", command.Name)
-		dispatch(command, &w, req, false)
+		return dispatch(command, w, req, false)
 	} else {
 		w.WriteHeader(http.StatusInternalServerError)
-		return
+		return nil
 	}
 }
 

raft_server.go

@@ -5,11 +5,11 @@ import (
 	"crypto/tls"
 	"encoding/json"
 	"fmt"
+	etcdErr "github.com/coreos/etcd/error"
+	"github.com/coreos/go-raft"
 	"net/http"
 	"net/url"
 	"time"
-
-	"github.com/coreos/go-raft"
 )
 
 type raftServer struct {
@@ -67,55 +67,10 @@ func (r *raftServer) ListenAndServe() {
 
 		// start as a leader in a new cluster
 		if len(cluster) == 0 {
+			startAsLeader()
 
-			time.Sleep(time.Millisecond * 20)
-
-			// leader need to join self as a peer
-			for {
-				_, err := r.Do(newJoinCommand())
-				if err == nil {
-					break
-				}
-			}
-			debugf("%s start as a leader", r.name)
-
-			// start as a follower in a existing cluster
 		} else {
-
-			time.Sleep(time.Millisecond * 20)
-
-			var err error
-
-			for i := 0; i < retryTimes; i++ {
-
-				success := false
-				for _, machine := range cluster {
-					if len(machine) == 0 {
-						continue
-					}
-					err = joinCluster(r.Server, machine, r.tlsConf.Scheme)
-					if err != nil {
-						if err.Error() == errors[103] {
-							fatal(err)
-						}
-						debugf("cannot join to cluster via machine %s %s", machine, err)
-					} else {
-						success = true
-						break
-					}
-				}
-
-				if success {
-					break
-				}
-
-				warnf("cannot join to cluster via given machines, retry in %d seconds", RetryInterval)
-				time.Sleep(time.Second * RetryInterval)
-			}
-			if err != nil {
-				fatalf("Cannot join the cluster via given machines after %x retries", retryTimes)
-			}
-			debugf("%s success join to the cluster", r.name)
+			startAsFollower()
 		}
 
 	} else {
@@ -133,6 +88,47 @@ func (r *raftServer) ListenAndServe() {
 
 }
 
+func startAsLeader() {
+	// leader need to join self as a peer
+	for {
+		_, err := r.Do(newJoinCommand())
+		if err == nil {
+			break
+		}
+	}
+	debugf("%s start as a leader", r.name)
+}
+
+func startAsFollower() {
+	// start as a follower in a existing cluster
+	for i := 0; i < retryTimes; i++ {
+
+		for _, machine := range cluster {
+
+			if len(machine) == 0 {
+				continue
+			}
+
+			err := joinCluster(r.Server, machine, r.tlsConf.Scheme)
+			if err == nil {
+				debugf("%s success join to the cluster via machine %s", r.name, machine)
+				return
+
+			} else {
+				if _, ok := err.(etcdErr.Error); ok {
+					fatal(err)
+				}
+				debugf("cannot join to cluster via machine %s %s", machine, err)
+			}
+		}
+
+		warnf("cannot join to cluster via given machines, retry in %d seconds", RetryInterval)
+		time.Sleep(time.Second * RetryInterval)
+	}
+
+	fatalf("Cannot join the cluster via given machines after %x retries", retryTimes)
+}
+
 // Start to listen and response raft command
 func (r *raftServer) startTransport(scheme string, tlsConf tls.Config) {
 	u, _ := url.Parse(r.url)
@@ -148,7 +144,7 @@ func (r *raftServer) startTransport(scheme string, tlsConf tls.Config) {
 
 	// internal commands
 	raftMux.HandleFunc("/name", NameHttpHandler)
-	raftMux.HandleFunc("/join", JoinHttpHandler)
+	raftMux.Handle("/join", errorHandler(JoinHttpHandler))
 	raftMux.HandleFunc("/vote", VoteHttpHandler)
 	raftMux.HandleFunc("/log", GetLogHttpHandler)
 	raftMux.HandleFunc("/log/append", AppendEntriesHttpHandler)
@@ -171,11 +167,7 @@ func joinCluster(s *raft.Server, raftURL string, scheme string) error {
 	json.NewEncoder(&b).Encode(newJoinCommand())
 
 	// t must be ok
-	t, ok := r.Transporter().(transporter)
-
-	if !ok {
-		panic("wrong type")
-	}
+	t, _ := r.Transporter().(transporter)
 
 	joinURL := url.URL{Host: raftURL, Scheme: scheme, Path: "/join"}
 
@@ -203,7 +195,10 @@ func joinCluster(s *raft.Server, raftURL string, scheme string) error {
 
 			} else if resp.StatusCode == http.StatusBadRequest {
 				debug("Reach max number machines in the cluster")
-				return fmt.Errorf(errors[103])
+				decoder := json.NewDecoder(resp.Body)
+				err := &etcdErr.Error{}
+				decoder.Decode(err)
+				return *err
 			} else {
 				return fmt.Errorf("Unable to join")
 			}

store/error.go

@@ -1,25 +0,0 @@
-package store
-
-type NotFoundError string
-
-func (e NotFoundError) Error() string {
-	return string(e)
-}
-
-type NotFile string
-
-func (e NotFile) Error() string {
-	return string(e)
-}
-
-type TestFail string
-
-func (e TestFail) Error() string {
-	return string(e)
-}
-
-type Keyword string
-
-func (e Keyword) Error() string {
-	return string(e)
-}

store/store.go

@@ -3,6 +3,7 @@ package store
 import (
 	"encoding/json"
 	"fmt"
+	etcdErr "github.com/coreos/etcd/error"
 	"path"
 	"strconv"
 	"sync"
@@ -239,8 +240,7 @@ func (s *Store) internalSet(key string, value string, expireTime time.Time, inde
 		ok := s.Tree.set(key, Node{value, expireTime, update})
 
 		if !ok {
-			err := NotFile(key)
-			return nil, err
+			return nil, etcdErr.NewError(102, "set: "+key)
 		}
 
 		if isExpire {
@@ -393,8 +393,7 @@ func (s *Store) RawGet(key string) ([]*Response, error) {
 		return resps, nil
 	}
 
-	err := NotFoundError(key)
-	return nil, err
+	return nil, etcdErr.NewError(100, "get: "+key)
 }
 
 func (s *Store) Delete(key string, index uint64) ([]byte, error) {
@@ -451,8 +450,7 @@ func (s *Store) internalDelete(key string, index uint64) ([]byte, error) {
 		return msg, err
 
 	} else {
-		err := NotFoundError(key)
-		return nil, err
+		return nil, etcdErr.NewError(100, "delete: "+key)
 	}
 }
 
@@ -467,8 +465,7 @@ func (s *Store) TestAndSet(key string, prevValue string, value string, expireTim
 	resp := s.internalGet(key)
 
 	if resp == nil {
-		err := NotFoundError(key)
-		return nil, err
+		return nil, etcdErr.NewError(100, "testandset: "+key)
 	}
 
 	if resp.Value == prevValue {
@@ -478,8 +475,8 @@ func (s *Store) TestAndSet(key string, prevValue string, value string, expireTim
 	} else {
 
 		// If fails, return err
-		err := TestFail(fmt.Sprintf("TestAndSet: %s!=%s", resp.Value, prevValue))
-		return nil, err
+		return nil, etcdErr.NewError(101, fmt.Sprintf("TestAndSet: %s!=%s",
+			resp.Value, prevValue))
 	}
 
 }

test/test.go

@@ -176,7 +176,7 @@ func Monitor(size int, allowDeadNum int, leaderChan chan string, all chan bool,
 
 func getLeader(addr string) (string, error) {
 
-	resp, err := client.Get(addr + "/leader")
+	resp, err := client.Get(addr + "/v1/leader")
 
 	if err != nil {
 		return "", err

third_party/github.com/coreos/go-etcd/etcd/client.go

@@ -116,7 +116,7 @@ func (c *Client) SyncCluster() bool {
 // sync cluster information by providing machine list
 func (c *Client) internalSyncCluster(machines []string) bool {
 	for _, machine := range machines {
-		httpPath := c.createHttpPath(machine, "machines")
+		httpPath := c.createHttpPath(machine, "v1/machines")
 		resp, err := c.httpClient.Get(httpPath)
 		if err != nil {
 			// try another machine in the cluster

third_party/github.com/coreos/go-etcd/examples/mutex/mutex.go

@@ -17,7 +17,6 @@ func main() {
 	c := etcd.NewClient()
 	c.Set("lock", "unlock", 0)
 
-
 	for i := 0; i < 10; i++ {
 		go t(i, ch, etcd.NewClient())
 	}

third_party/github.com/coreos/go-etcd/examples/speed/speed.go

@@ -1,8 +1,8 @@
-package main 
+package main
 
 import (
-	"github.com/coreos/go-etcd/etcd"
 	"fmt"
+	"github.com/coreos/go-etcd/etcd"
 	"time"
 )
 
@@ -11,21 +11,21 @@ var count = 0
 func main() {
 	ch := make(chan bool, 10)
 	// set up a lock
-	for i:=0; i < 100; i++ {
+	for i := 0; i < 100; i++ {
 		go t(i, ch, etcd.NewClient())
 	}
 	start := time.Now()
-	for i:=0; i< 100; i++ {
+	for i := 0; i < 100; i++ {
 		<-ch
 	}
-	fmt.Println(time.Now().Sub(start), ": ", 100 * 50, "commands")
+	fmt.Println(time.Now().Sub(start), ": ", 100*50, "commands")
 }
 
 func t(num int, ch chan bool, c *etcd.Client) {
 	c.SyncCluster()
 	for i := 0; i < 50; i++ {
-		str := fmt.Sprintf("foo_%d",num * i)
+		str := fmt.Sprintf("foo_%d", num*i)
 		c.Set(str, "10", 0)
 	}
-	ch<-true
+	ch <- true
 }

web/web.go

@@ -29,12 +29,12 @@ func Start(raftServer *raft.Server, webURL string) {
 	webMux := http.NewServeMux()
 
 	server := &http.Server{
-		Handler:   webMux,
-		Addr:      u.Host,
+		Handler: webMux,
+		Addr:    u.Host,
 	}
 
 	mainPage = &MainPage{
-		Leader: raftServer.Leader(),
+		Leader:  raftServer.Leader(),
 		Address: u.Host,
 	}