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clean error handling

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This commit is contained in:
Xiang Li 2013-08-17 15:06:21 -07:00
parent ef4aef950e
commit 8ed67bedbb
3 changed files with 91 additions and 113 deletions
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12
error.go
View File

@ -33,17 +33,21 @@ func init() {
}
type jsonError struct {
type etcdError 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 newEtcdError(errorCode int, cause string) *etcdError {
return &etcdError{
ErrorCode: errorCode,
Message: errors[errorCode],
Cause: cause,
})
}
}
func (e *etcdError) toJson() []byte {
b, _ := json.Marshal(e)
return b
}

190
etcd_handlers.go
View File

@ -16,29 +16,42 @@ 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/", etcdHandler(Multiplexer))
etcdMux.Handle("/"+version+"/watch/", etcdHandler(WatchHttpHandler))
etcdMux.Handle("/leader", etcdHandler(LeaderHttpHandler))
etcdMux.Handle("/machines", etcdHandler(MachinesHttpHandler))
etcdMux.Handle("/version", etcdHandler(VersionHttpHandler))
etcdMux.Handle("/stats", etcdHandler(StatsHttpHandler))
etcdMux.HandleFunc("/test/", TestHttpHandler)
return etcdMux
}
type etcdHandler func(http.ResponseWriter, *http.Request) *etcdError
func (fn etcdHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if e := fn(w, r); e != nil {
// 3xx is reft internal error
if e.ErrorCode/100 == 3 {
http.Error(w, string(e.toJson()), http.StatusInternalServerError)
} else {
http.Error(w, string(e.toJson()), http.StatusBadRequest)
}
}
}
// Multiplex GET/POST/DELETE request to corresponding handlers
func Multiplexer(w http.ResponseWriter, req *http.Request) {
func Multiplexer(w http.ResponseWriter, req *http.Request) *etcdError {
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 +61,11 @@ 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) *etcdError {
key := req.URL.Path[len("/v1/keys/"):]
if store.CheckKeyword(key) {
(*w).WriteHeader(http.StatusBadRequest)
(*w).Write(newJsonError(400, "Set"))
return
return newEtcdError(400, "Set")
}
debugf("[recv] POST %v/v1/keys/%s [%s]", e.url, key, req.RemoteAddr)
@ -64,10 +73,7 @@ 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 newEtcdError(200, "Set")
}
prevValue := req.FormValue("prevValue")
@ -77,11 +83,7 @@ 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 newEtcdError(202, "Set")
}
if len(prevValue) != 0 {
@ -92,7 +94,7 @@ 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 +103,12 @@ 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) *etcdError {
key := req.URL.Path[len("/v1/keys/"):]
debugf("[recv] DELETE %v/v1/keys/%s [%s]", e.url, key, req.RemoteAddr)
@ -116,76 +117,61 @@ 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) *etcdError {
if r.State() == raft.Leader {
if body, err := r.Do(c); err != nil {
// store error
if _, ok := err.(store.NotFoundError); ok {
(*w).WriteHeader(http.StatusNotFound)
(*w).Write(newJsonError(100, err.Error()))
return
return newEtcdError(100, err.Error())
}
if _, ok := err.(store.TestFail); ok {
(*w).WriteHeader(http.StatusBadRequest)
(*w).Write(newJsonError(101, err.Error()))
return
return newEtcdError(101, err.Error())
}
if _, ok := err.(store.NotFile); ok {
(*w).WriteHeader(http.StatusBadRequest)
(*w).Write(newJsonError(102, err.Error()))
return
return newEtcdError(102, err.Error())
}
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
} else {
if body == nil {
(*w).WriteHeader(http.StatusNotFound)
(*w).Write(newJsonError(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)
// join error
if err.Error() == errors[103] {
return newEtcdError(103, "")
}
// raft internal error
return newEtcdError(300, err.Error())
} else {
if body == nil {
return newEtcdError(300, "Empty result from raft")
} else {
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 newEtcdError(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 +180,10 @@ 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 newEtcdError(300, "")
}
//--------------------------------------
@ -210,44 +194,45 @@ 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) *etcdError {
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 newEtcdError(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) *etcdError {
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) *etcdError {
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)
fmt.Fprintf(w, "etcd API %s", version)
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) *etcdError {
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) *etcdError {
key := req.URL.Path[len("/v1/keys/"):]
debugf("[recv] GET %s/v1/keys/%s [%s]", e.url, key, req.RemoteAddr)
@ -259,29 +244,23 @@ 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
return newEtcdError(100, err.Error())
}
(*w).WriteHeader(http.StatusInternalServerError)
(*w).Write(newJsonError(300, ""))
return newEtcdError(300, "")
} 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) *etcdError {
key := req.URL.Path[len("/v1/watch/"):]
command := &WatchCommand{
@ -300,28 +279,23 @@ 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 newEtcdError(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 newEtcdError(500, key)
} else {
w.WriteHeader(http.StatusOK)
body, ok := body.([]byte)
if !ok {
panic("wrong type")
}
body, _ := body.([]byte)
w.Write(body)
return nil
}
}

2
raft_handlers.go
View File

@ -100,7 +100,7 @@ func JoinHttpHandler(w http.ResponseWriter, req *http.Request) {
if err := decodeJsonRequest(req, command); err == nil {
debugf("Receive Join Request from %s", command.Name)
dispatch(command, &w, req, false)
dispatch(command, w, req, false)
} else {
w.WriteHeader(http.StatusInternalServerError)
return