328 lines
7.5 KiB
Go
328 lines
7.5 KiB
Go
package main
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import (
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"encoding/json"
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"github.com/coreos/go-raft"
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"net/http"
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"strconv"
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"time"
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)
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//--------------------------------------
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// Internal HTTP Handlers via server port
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//--------------------------------------
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// Get all the current logs
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func GetLogHttpHandler(w http.ResponseWriter, req *http.Request) {
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debug("[recv] GET http://%v/log", server.Name())
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(server.LogEntries())
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}
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func VoteHttpHandler(w http.ResponseWriter, req *http.Request) {
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rvreq := &raft.RequestVoteRequest{}
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err := decodeJsonRequest(req, rvreq)
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if err == nil {
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debug("[recv] POST http://%v/vote [%s]", server.Name(), rvreq.CandidateName)
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if resp := server.RequestVote(rvreq); resp != nil {
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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return
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}
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}
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warn("[vote] ERROR: %v", err)
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w.WriteHeader(http.StatusInternalServerError)
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}
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func AppendEntriesHttpHandler(w http.ResponseWriter, req *http.Request) {
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aereq := &raft.AppendEntriesRequest{}
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err := decodeJsonRequest(req, aereq)
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if err == nil {
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debug("[recv] POST http://%s/log/append [%d]", server.Name(), len(aereq.Entries))
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if resp := server.AppendEntries(aereq); resp != nil {
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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if !resp.Success {
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debug("[Append Entry] Step back")
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}
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return
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}
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}
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warn("[append] ERROR: %v", err)
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w.WriteHeader(http.StatusInternalServerError)
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}
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func SnapshotHttpHandler(w http.ResponseWriter, req *http.Request) {
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aereq := &raft.SnapshotRequest{}
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err := decodeJsonRequest(req, aereq)
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if err == nil {
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debug("[recv] POST http://%s/snapshot/ ", server.Name())
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if resp, _ := server.SnapshotRecovery(aereq); resp != nil {
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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return
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}
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}
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warn("[snapshot] ERROR: %v", err)
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w.WriteHeader(http.StatusInternalServerError)
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}
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func clientHttpHandler(w http.ResponseWriter, req *http.Request) {
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debug("[recv] Get http://%v/client/ ", server.Name())
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w.WriteHeader(http.StatusOK)
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client := address + ":" + strconv.Itoa(clientPort)
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w.Write([]byte(client))
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}
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func JoinHttpHandler(w http.ResponseWriter, req *http.Request) {
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command := &JoinCommand{}
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if err := decodeJsonRequest(req, command); err == nil {
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debug("Receive Join Request from %s", command.Name)
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excute(command, &w, req)
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} else {
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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}
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//--------------------------------------
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// external HTTP Handlers via client port
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//--------------------------------------
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func Multiplexer(w http.ResponseWriter, req *http.Request) {
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if req.Method == "GET" {
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GetHttpHandler(&w, req)
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} else if req.Method == "POST" {
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SetHttpHandler(&w, req)
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} else if req.Method == "DELETE" {
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DeleteHttpHandler(&w, req)
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} else {
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w.WriteHeader(http.StatusMethodNotAllowed)
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return
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}
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}
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func SetHttpHandler(w *http.ResponseWriter, req *http.Request) {
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key := req.URL.Path[len("/v1/keys/"):]
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debug("[recv] POST http://%v/v1/keys/%s", server.Name(), key)
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command := &SetCommand{}
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command.Key = key
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command.Value = req.FormValue("value")
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strDuration := req.FormValue("ttl")
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if strDuration != "" {
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duration, err := strconv.Atoi(strDuration)
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if err != nil {
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warn("raftd: Bad duration: %v", err)
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(*w).WriteHeader(http.StatusInternalServerError)
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return
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}
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command.ExpireTime = time.Now().Add(time.Second * (time.Duration)(duration))
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} else {
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command.ExpireTime = time.Unix(0, 0)
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}
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excute(command, w, req)
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}
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func TestAndSetHttpHandler(w http.ResponseWriter, req *http.Request) {
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key := req.URL.Path[len("/v1/testAndSet/"):]
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debug("[recv] POST http://%v/v1/testAndSet/%s", server.Name(), key)
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command := &TestAndSetCommand{}
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command.Key = key
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command.PrevValue = req.FormValue("prevValue")
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command.Value = req.FormValue("value")
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strDuration := req.FormValue("ttl")
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if strDuration != "" {
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duration, err := strconv.Atoi(strDuration)
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if err != nil {
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warn("raftd: Bad duration: %v", err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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command.ExpireTime = time.Now().Add(time.Second * (time.Duration)(duration))
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} else {
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command.ExpireTime = time.Unix(0, 0)
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}
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excute(command, &w, req)
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}
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func DeleteHttpHandler(w *http.ResponseWriter, req *http.Request) {
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key := req.URL.Path[len("/v1/keys/"):]
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debug("[recv] DELETE http://%v/v1/keys/%s", server.Name(), key)
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command := &DeleteCommand{}
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command.Key = key
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excute(command, w, req)
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}
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func excute(c Command, w *http.ResponseWriter, req *http.Request) {
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if server.State() == "leader" {
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if body, err := server.Do(c); err != nil {
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warn("Commit failed %v", err)
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(*w).WriteHeader(http.StatusInternalServerError)
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return
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} else {
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(*w).WriteHeader(http.StatusOK)
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if body == nil {
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return
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}
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body, ok := body.([]byte)
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if !ok {
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panic("wrong type")
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}
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(*w).Write(body)
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return
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}
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} else {
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// current no leader
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if server.Leader() == "" {
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(*w).WriteHeader(http.StatusInternalServerError)
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return
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}
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// tell the client where is the leader
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debug("Redirect to the leader %s", server.Leader())
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path := req.URL.Path
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var scheme string
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if scheme = req.URL.Scheme; scheme == "" {
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scheme = "http://"
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}
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url := scheme + leaderClient() + path
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debug("redirect to %s", url)
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http.Redirect(*w, req, url, http.StatusTemporaryRedirect)
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return
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}
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(*w).WriteHeader(http.StatusInternalServerError)
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return
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}
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func MasterHttpHandler(w http.ResponseWriter, req *http.Request) {
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w.WriteHeader(http.StatusOK)
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w.Write([]byte(server.Leader()))
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}
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func GetHttpHandler(w *http.ResponseWriter, req *http.Request) {
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key := req.URL.Path[len("/v1/keys/"):]
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debug("[recv] GET http://%v/v1/keys/%s", server.Name(), key)
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command := &GetCommand{}
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command.Key = key
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if body, err := command.Apply(server); err != nil {
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warn("raftd: Unable to write file: %v", err)
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(*w).WriteHeader(http.StatusInternalServerError)
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return
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} else {
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(*w).WriteHeader(http.StatusOK)
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body, ok := body.([]byte)
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if !ok {
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panic("wrong type")
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}
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(*w).Write(body)
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return
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}
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}
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func ListHttpHandler(w http.ResponseWriter, req *http.Request) {
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prefix := req.URL.Path[len("/v1/list/"):]
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debug("[recv] GET http://%v/v1/list/%s", server.Name(), prefix)
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command := &ListCommand{}
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command.Prefix = prefix
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if body, err := command.Apply(server); err != nil {
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warn("raftd: Unable to write file: %v", err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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} else {
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w.WriteHeader(http.StatusOK)
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body, ok := body.([]byte)
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if !ok {
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panic("wrong type")
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}
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w.Write(body)
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return
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}
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}
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func WatchHttpHandler(w http.ResponseWriter, req *http.Request) {
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key := req.URL.Path[len("/v1/watch/"):]
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command := &WatchCommand{}
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command.Key = key
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if req.Method == "GET" {
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debug("[recv] GET http://%v/watch/%s", server.Name(), key)
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command.SinceIndex = 0
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} else if req.Method == "POST" {
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debug("[recv] POST http://%v/watch/%s", server.Name(), key)
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content := req.FormValue("index")
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sinceIndex, err := strconv.ParseUint(string(content), 10, 64)
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if err != nil {
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w.WriteHeader(http.StatusBadRequest)
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}
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command.SinceIndex = sinceIndex
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} else {
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w.WriteHeader(http.StatusMethodNotAllowed)
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return
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}
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if body, err := command.Apply(server); err != nil {
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warn("raftd: Unable to write file: %v", err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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} else {
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w.WriteHeader(http.StatusOK)
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body, ok := body.([]byte)
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if !ok {
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panic("wrong type")
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}
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w.Write(body)
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return
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}
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}
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