etcdctl: add migratesnap command

etcdctl/command/import_snap_command.go

@@ -0,0 +1,113 @@
+package command
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+	"sync"
+
+	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/codegangsta/cli"
+	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/go-etcd/etcd"
+	"github.com/coreos/etcd/store"
+)
+
+type set struct {
+	key   string
+	value string
+	ttl   int64
+}
+
+func NewImportSnapCommand() cli.Command {
+	return cli.Command{
+		Name:  "import",
+		Usage: "import a snapshot to a cluster",
+		Flags: []cli.Flag{
+			cli.StringFlag{Name: "snap", Value: "", Usage: "Path to the vaild etcd 0.4.x snapshot."},
+			cli.IntFlag{Name: "c", Value: 10, Usage: "Number of concurrent clients to import the data"},
+		},
+		Action: handleImportSnap,
+	}
+}
+
+func handleImportSnap(c *cli.Context) {
+	d, err := ioutil.ReadFile(c.String("snap"))
+	if err != nil {
+		fmt.Printf("cannot read snapshot file %s\n", c.String("snap"))
+		os.Exit(1)
+	}
+
+	st := store.New()
+	err = st.Recovery(d)
+	if err != nil {
+		fmt.Printf("cannot recover the snapshot file: %v\n", err)
+		os.Exit(1)
+	}
+
+	endpoints, err := getEndpoints(c)
+	if err != nil {
+		handleError(ErrorFromEtcd, err)
+	}
+	tr, err := getTransport(c)
+	if err != nil {
+		handleError(ErrorFromEtcd, err)
+	}
+
+	wg := &sync.WaitGroup{}
+	setc := make(chan set)
+	concurrent := c.Int("c")
+	fmt.Printf("starting to import snapshot %s with %d clients\n", c.String("snap"), concurrent)
+	for i := 0; i < concurrent; i++ {
+		client := etcd.NewClient(endpoints)
+		client.SetTransport(tr)
+
+		if c.GlobalBool("debug") {
+			go dumpCURL(client)
+		}
+
+		if ok := client.SyncCluster(); !ok {
+			handleError(FailedToConnectToHost, errors.New("cannot sync with the cluster using endpoints "+strings.Join(endpoints, ", ")))
+		}
+		wg.Add(1)
+		go runSet(client, setc, wg)
+	}
+
+	all, err := st.Get("/", true, true)
+	if err != nil {
+		handleError(ErrorFromEtcd, err)
+	}
+	n := copyKeys(all.Node, setc)
+	close(setc)
+	fmt.Printf("finished importing %d keys\n", n)
+}
+
+func copyKeys(n *store.NodeExtern, setc chan set) int {
+	num := 0
+	if !n.Dir {
+		setc <- set{n.Key, *n.Value, n.TTL}
+		return 1
+	}
+	log.Println("entrying dir:", n.Key)
+	for _, nn := range n.Nodes {
+		sub := copyKeys(nn, setc)
+		num += sub
+	}
+	return num
+}
+
+func runSet(c *etcd.Client, setc chan set, wg *sync.WaitGroup) {
+	for s := range setc {
+		log.Println("copying key:", s.key)
+		if s.ttl != 0 && s.ttl < 300 {
+			log.Printf("extending key %s's ttl to 300 seconds", s.key)
+			s.ttl = 5 * 60
+		}
+		_, err := c.Set(s.key, s.value, uint64(s.ttl))
+		if err != nil {
+			log.Fatalf("failed to copy key: %v\n", err)
+		}
+	}
+	wg.Done()
+}

etcdctl/main.go

@@ -52,6 +52,7 @@ func main() {
 		command.NewWatchCommand(),
 		command.NewExecWatchCommand(),
 		command.NewMemberCommand(),
+		command.NewImportSnapCommand(),
 	}
 
 	app.Run(os.Args)