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feat: add raft from etcd key value store example
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| # Use goreman to run `go install github.com/mattn/goreman@latest` | ||
| raftexample1: ./raftexample --id 1 --cluster http://127.0.0.1:12379,http://127.0.0.1:22379,http://127.0.0.1:32379 --port 12380 --pedis 127.0.0.1:6379 | ||
| raftexample2: ./raftexample --id 2 --cluster http://127.0.0.1:12379,http://127.0.0.1:22379,http://127.0.0.1:32379 --port 22380 --pedis 127.0.0.1:6389 | ||
| raftexample3: ./raftexample --id 3 --cluster http://127.0.0.1:12379,http://127.0.0.1:22379,http://127.0.0.1:32379 --port 32380 --pedis 127.0.0.1:6399 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,56 +1,52 @@ | ||
| // Copyright 2015 The etcd Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "flag" | ||
| "log" | ||
| "pedis/node" | ||
| "pedis/internal/storage" | ||
| "pedis/praft" | ||
| "strings" | ||
| ) | ||
|
|
||
| var addr string | ||
| var raftAddr string | ||
| var joinAddr string | ||
| var startJoinAddrs string | ||
| var id string | ||
| var membershipAddr string | ||
| var bootstrap bool | ||
|
|
||
| func init() { | ||
| flag.StringVar(&membershipAddr, "serf-addr", "localhost:6359", "the address where the cluster membership server is listening") | ||
| flag.StringVar(&raftAddr, "raft-addr", "localhost:6389", "the address where the raft server is listening") | ||
| flag.StringVar(&addr, "addr", "localhost:6379", "the address where the server will listen") | ||
| flag.StringVar(&id, "id", "primary", "the unique id of the server in the cluster") | ||
| flag.StringVar(&joinAddr, "join-addr", "", "set address of the leader of the cluster") | ||
| flag.StringVar(&startJoinAddrs, "sjoin-addr", "", "set addresses of cluster members to join when starting") | ||
| flag.BoolVar(&bootstrap, "bootstrap", false, "start as bootstrap node") | ||
| } | ||
| "go.etcd.io/etcd/raft/v3/raftpb" | ||
| ) | ||
|
|
||
| func main() { | ||
| cluster := flag.String("cluster", "http://127.0.0.1:9021", "comma separated cluster peers") | ||
| id := flag.Int("id", 1, "node ID") | ||
| kvport := flag.Int("port", 9121, "key-value server port") | ||
| join := flag.Bool("join", false, "join an existing cluster") | ||
| pedis := flag.String("pedis", ":6379", "port where pedis server is running") | ||
| flag.Parse() | ||
|
|
||
| joinAddrs := []string{} | ||
| proposeC := make(chan string) | ||
| defer close(proposeC) | ||
|
|
||
| if startJoinAddrs != "" { | ||
| joinAddrs = strings.Split(startJoinAddrs, ",") | ||
| } | ||
| confChangeC := make(chan raftpb.ConfChange) | ||
| defer close(confChangeC) | ||
|
|
||
| node, err := node.NewNode(node.Config{ | ||
| Bootstrap: bootstrap, | ||
| JoinAddr: joinAddr, | ||
| RaftAddr: raftAddr, | ||
| MembershipAddr: membershipAddr, | ||
| ServerAddr: addr, | ||
| ServerId: id, | ||
| StartJoinAddrs: joinAddrs, | ||
| }) | ||
| storageProposeChan := make(chan storage.StorageData) | ||
| defer close(storageProposeChan) | ||
|
|
||
| if err != nil { | ||
| log.Fatalf("error creating node %v", err) | ||
| } | ||
| // raft provides a commit stream for the proposals from the http api | ||
| var kvs *praft.PedisServer | ||
| getSnapshot := func() ([]byte, error) { return kvs.GetSnapshot() } | ||
| commitC, errorC, snapshotterReady := praft.NewRaftNode(*id, strings.Split(*cluster, ","), *join, getSnapshot, proposeC, confChangeC) | ||
|
|
||
| err = node.Start() | ||
| kvs = praft.NewKVStore(<-snapshotterReady, proposeC, commitC, errorC, storage.NewSimpleStorage(storageProposeChan), *pedis, storageProposeChan) | ||
|
|
||
| if err != nil { | ||
| log.Fatalf("error starting pedis node %v", err) | ||
| } | ||
| // the key-value http handler will propose updates to raft | ||
| praft.ServeHTTPKVAPI(kvs, *kvport, confChangeC, errorC) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,128 @@ | ||
| // Copyright 2015 The etcd Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package praft | ||
|
|
||
| import ( | ||
| "io" | ||
| "log" | ||
| "net/http" | ||
| "strconv" | ||
|
|
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| "go.etcd.io/etcd/raft/v3/raftpb" | ||
| ) | ||
|
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| // Handler for a http based key-value store backed by raft | ||
| type httpKVAPI struct { | ||
| store *PedisServer | ||
| confChangeC chan<- raftpb.ConfChange | ||
| } | ||
|
|
||
| func (h *httpKVAPI) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| key := r.RequestURI | ||
| defer r.Body.Close() | ||
| switch r.Method { | ||
| case http.MethodPut: | ||
| v, err := io.ReadAll(r.Body) | ||
| if err != nil { | ||
| log.Printf("Failed to read on PUT (%v)\n", err) | ||
| http.Error(w, "Failed on PUT", http.StatusBadRequest) | ||
| return | ||
| } | ||
|
|
||
| log.Printf("command change (%v)\n", v) | ||
| // h.store.Propose(key, string(v)) | ||
|
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||
| // Optimistic-- no waiting for ack from raft. Value is not yet | ||
| // committed so a subsequent GET on the key may return old value | ||
| w.WriteHeader(http.StatusNoContent) | ||
| case http.MethodGet: | ||
| if v, ok := h.store.Lookup(key); ok { | ||
| w.Write([]byte(v)) | ||
| } else { | ||
| http.Error(w, "Failed to GET", http.StatusNotFound) | ||
| } | ||
| case http.MethodPost: | ||
| url, err := io.ReadAll(r.Body) | ||
| if err != nil { | ||
| log.Printf("Failed to read on POST (%v)\n", err) | ||
| http.Error(w, "Failed on POST", http.StatusBadRequest) | ||
| return | ||
| } | ||
|
|
||
| nodeID, err := strconv.ParseUint(key[1:], 0, 64) | ||
| if err != nil { | ||
| log.Printf("Failed to convert ID for conf change (%v)\n", err) | ||
| http.Error(w, "Failed on POST", http.StatusBadRequest) | ||
| return | ||
| } | ||
|
|
||
| cc := raftpb.ConfChange{ | ||
| Type: raftpb.ConfChangeAddNode, | ||
| NodeID: nodeID, | ||
| Context: url, | ||
| } | ||
| h.confChangeC <- cc | ||
| // As above, optimistic that raft will apply the conf change | ||
| w.WriteHeader(http.StatusNoContent) | ||
| case http.MethodDelete: | ||
| nodeID, err := strconv.ParseUint(key[1:], 0, 64) | ||
| if err != nil { | ||
| log.Printf("Failed to convert ID for conf change (%v)\n", err) | ||
| http.Error(w, "Failed on DELETE", http.StatusBadRequest) | ||
| return | ||
| } | ||
|
|
||
| cc := raftpb.ConfChange{ | ||
| Type: raftpb.ConfChangeRemoveNode, | ||
| NodeID: nodeID, | ||
| } | ||
| h.confChangeC <- cc | ||
|
|
||
| // As above, optimistic that raft will apply the conf change | ||
| w.WriteHeader(http.StatusNoContent) | ||
| default: | ||
| w.Header().Set("Allow", http.MethodPut) | ||
| w.Header().Add("Allow", http.MethodGet) | ||
| w.Header().Add("Allow", http.MethodPost) | ||
| w.Header().Add("Allow", http.MethodDelete) | ||
| http.Error(w, "Method not allowed", http.StatusMethodNotAllowed) | ||
| } | ||
| } | ||
|
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||
| // serveHTTPKVAPI starts a key-value server with a GET/PUT API and listens. | ||
| func ServeHTTPKVAPI(kv *PedisServer, port int, confChangeC chan<- raftpb.ConfChange, errorC <-chan error) { | ||
| srv := http.Server{ | ||
| Addr: ":" + strconv.Itoa(port), | ||
| Handler: &httpKVAPI{ | ||
| store: kv, | ||
| confChangeC: confChangeC, | ||
| }, | ||
| } | ||
| go func() { | ||
| if err := srv.ListenAndServe(); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| }() | ||
|
|
||
| go func() { | ||
| if err := kv.StartPedis(); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| }() | ||
| // exit when raft goes down | ||
| if err, ok := <-errorC; ok { | ||
| log.Fatal(err) | ||
| } | ||
| } |
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