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watch_command.go
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watch_command.go
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// Copyright 2015 CoreOS, Inc.
//
// 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 command
import (
"bufio"
"fmt"
"io"
"os"
"strings"
"github.com/coreos/etcd/Godeps/_workspace/src/github.com/spf13/cobra"
"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
"github.com/coreos/etcd/Godeps/_workspace/src/google.golang.org/grpc"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
)
// NewWatchCommand returns the cobra command for "watch".
func NewWatchCommand() *cobra.Command {
return &cobra.Command{
Use: "watch",
Short: "Watch watches the events happening or happened.",
Run: watchCommandFunc,
}
}
// watchCommandFunc executes the "watch" command.
func watchCommandFunc(cmd *cobra.Command, args []string) {
endpoint, err := cmd.Flags().GetString("endpoint")
if err != nil {
ExitWithError(ExitInvalidInput, err)
}
conn, err := grpc.Dial(endpoint)
if err != nil {
ExitWithError(ExitBadConnection, err)
}
wAPI := pb.NewWatchClient(conn)
wStream, err := wAPI.Watch(context.TODO())
if err != nil {
ExitWithError(ExitBadConnection, err)
}
go recvLoop(wStream)
reader := bufio.NewReader(os.Stdin)
for {
l, err := reader.ReadString('\n')
if err != nil {
ExitWithError(ExitInvalidInput, fmt.Errorf("Error reading watch request line: %v", err))
}
l = strings.TrimSuffix(l, "\n")
// TODO: support start and end revision
segs := strings.Split(l, " ")
if len(segs) != 2 {
fmt.Fprintf(os.Stderr, "Invalid watch request format: use watch key or watchprefix prefix\n")
continue
}
var r *pb.WatchRequest
switch segs[0] {
case "watch":
r = &pb.WatchRequest{Key: []byte(segs[1])}
case "watchprefix":
r = &pb.WatchRequest{Prefix: []byte(segs[1])}
default:
fmt.Fprintf(os.Stderr, "Invalid watch request format: use watch key or watchprefix prefix\n")
continue
}
err = wStream.Send(r)
if err != nil {
fmt.Fprintf(os.Stderr, "Error sending request to server: %v\n", err)
}
}
}
func recvLoop(wStream pb.Watch_WatchClient) {
for {
resp, err := wStream.Recv()
if err == io.EOF {
os.Exit(ExitSuccess)
}
if err != nil {
ExitWithError(ExitError, err)
}
fmt.Printf("%s: %s %s\n", resp.Event.Type, string(resp.Event.Kv.Key), string(resp.Event.Kv.Value))
}
}