forked from etcd-io/etcd
/
main.go
136 lines (116 loc) · 3.03 KB
/
main.go
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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/proxy"
"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")
proxyMode = flag.Bool("proxy-mode", false, "Forward HTTP requests to peers, do not participate in raft.")
peers = &etcdhttp.Peers{}
)
func init() {
peers.Set("0x1=localhost:8080")
flag.Var(peers, "peers", "your peers")
}
func main() {
flag.Parse()
var h http.Handler
if *proxyMode {
h = startProxy()
} else {
h = startEtcd()
}
http.Handle("/", h)
log.Fatal(http.ListenAndServe(*laddr, nil))
}
func startEtcd() http.Handler {
id, err := strconv.ParseInt(*fid, 0, 64)
if err != nil {
log.Fatal(err)
}
if id == raft.None {
log.Fatalf("etcd: cannot use None(%d) as etcdserver id", raft.None)
}
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,
}
return &h
}
// 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 one
w, err := wal.OpenAtIndex(waldir, 1)
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
}
func startProxy() http.Handler {
h, err := proxy.NewHandler((*peers).Endpoints())
if err != nil {
log.Fatal(err)
}
return h
}