c251304068
golang convention dictates that the individual characters in an abbreviation should all have the same case. Use ID instead of Id. The protobuf generator still generates code that does not meet this convention, but that's a fight for another day.
110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
package main
|
|
|
|
import (
|
|
"flag"
|
|
"fmt"
|
|
"log"
|
|
"net/http"
|
|
"os"
|
|
"path"
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/coreos/etcd/etcdserver"
|
|
"github.com/coreos/etcd/etcdserver/etcdhttp"
|
|
"github.com/coreos/etcd/raft"
|
|
"github.com/coreos/etcd/store"
|
|
"github.com/coreos/etcd/wal"
|
|
)
|
|
|
|
const (
|
|
// the owner can make/remove files inside the directory
|
|
privateDirMode = 0700
|
|
)
|
|
|
|
var (
|
|
fid = flag.String("id", "0x1", "ID of this server")
|
|
timeout = flag.Duration("timeout", 10*time.Second, "Request Timeout")
|
|
laddr = flag.String("l", ":8080", "HTTP service address (e.g., ':8080')")
|
|
dir = flag.String("data-dir", "", "Path to the data directory")
|
|
|
|
peers = &etcdhttp.Peers{}
|
|
)
|
|
|
|
func init() {
|
|
peers.Set("0x1=localhost:8080")
|
|
flag.Var(peers, "peers", "your peers")
|
|
}
|
|
|
|
func main() {
|
|
flag.Parse()
|
|
|
|
id, err := strconv.ParseInt(*fid, 0, 64)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
if peers.Pick(id) == "" {
|
|
log.Fatalf("%#x=<addr> must be specified in peers", id)
|
|
}
|
|
|
|
if *dir == "" {
|
|
*dir = fmt.Sprintf("%v_etcd_data", *fid)
|
|
log.Printf("main: no data-dir is given, using default data-dir ./%s", *dir)
|
|
}
|
|
if err := os.MkdirAll(*dir, privateDirMode); err != nil {
|
|
log.Fatalf("main: cannot create data directory: %v", err)
|
|
}
|
|
|
|
n, w := startRaft(id, peers.IDs(), path.Join(*dir, "wal"))
|
|
|
|
tk := time.NewTicker(100 * time.Millisecond)
|
|
s := &etcdserver.Server{
|
|
Store: store.New(),
|
|
Node: n,
|
|
Save: w.Save,
|
|
Send: etcdhttp.Sender(*peers),
|
|
Ticker: tk.C,
|
|
}
|
|
etcdserver.Start(s)
|
|
h := &etcdhttp.Handler{
|
|
Timeout: *timeout,
|
|
Server: s,
|
|
Peers: *peers,
|
|
}
|
|
http.Handle("/", h)
|
|
log.Fatal(http.ListenAndServe(*laddr, nil))
|
|
}
|
|
|
|
// startRaft starts a raft node from the given wal dir.
|
|
// If the wal dir does not exist, startRaft will start a new raft node.
|
|
// If the wal dir exists, startRaft will restart the previous raft node.
|
|
// startRaft returns the started raft node and the opened wal.
|
|
func startRaft(id int64, peerIDs []int64, waldir string) (raft.Node, *wal.WAL) {
|
|
if !wal.Exist(waldir) {
|
|
w, err := wal.Create(waldir)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
n := raft.Start(id, peerIDs, 10, 1)
|
|
return n, w
|
|
}
|
|
|
|
// restart a node from previous wal
|
|
// TODO(xiangli): check snapshot; not open from zero
|
|
w, err := wal.OpenFromIndex(waldir, 0)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
wid, st, ents, err := w.ReadAll()
|
|
// TODO(xiangli): save/recovery nodeID?
|
|
if wid != 0 {
|
|
log.Fatalf("unexpected nodeid %d: nodeid should always be zero until we save nodeid into wal", wid)
|
|
}
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
n := raft.Restart(id, peerIDs, 10, 1, st, ents)
|
|
return n, w
|
|
}
|