Implement journal replay

Add addprocess event for addtional processes

Add more api process information

containerd/journal.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/codegangsta/cli"
+	"github.com/crosbymichael/containerd"
+)
+
+var JournalCommand = cli.Command{
+	Name:  "journal",
+	Usage: "interact with the containerd journal",
+	Subcommands: []cli.Command{
+		JournalReplyCommand,
+	},
+}
+
+var JournalReplyCommand = cli.Command{
+	Name:  "replay",
+	Usage: "replay a journal to get containerd's state syncronized after a crash",
+	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name:  "addr",
+			Value: "localhost:8888",
+			Usage: "address of the containerd daemon",
+		},
+	},
+	Action: func(context *cli.Context) {
+		if err := replay(context.Args().First(), context.String("addr")); err != nil {
+			logrus.Fatal(err)
+		}
+	},
+}
+
+func replay(path, addr string) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	dec := json.NewDecoder(f)
+	var events []*containerd.Event
+	type entry struct {
+		Event *containerd.Event `json:"event"`
+	}
+	for dec.More() {
+		var e entry
+		if err := dec.Decode(&e); err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+		events = append(events, e.Event)
+	}
+	c := &http.Client{}
+	for _, e := range events {
+		switch e.Type {
+		case containerd.ExitEventType, containerd.DeleteEventType:
+			// ignore these types of events
+			continue
+		}
+		data, err := json.Marshal(e)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("sending %q event\n", e.Type)
+		r, err := c.Post("http://"+filepath.Join(addr, "event"), "application/json", bytes.NewBuffer(data))
+		if err != nil {
+			return err
+		}
+		if r.Body != nil {
+			io.Copy(os.Stdout, r.Body)
+			r.Body.Close()
+		}
+	}
+	return nil
+}

containerd/main.go

@@ -25,6 +25,7 @@ func main() {
 	}
 	app.Commands = []cli.Command{
 		DaemonCommand,
+		JournalCommand,
 	}
 	app.Flags = []cli.Flag{
 		cli.BoolFlag{Name: "debug", Usage: "enable debug output in the logs"},