mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package command
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/codegangsta/cli"
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"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
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"github.com/coreos/etcd/Godeps/_workspace/src/google.golang.org/grpc"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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)
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// NewWatchCommand returns the CLI command for "watch".
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func NewWatchCommand() cli.Command {
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return cli.Command{
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Name: "watch",
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Action: func(c *cli.Context) {
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watchCommandFunc(c)
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},
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}
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}
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// watchCommandFunc executes the "watch" command.
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func watchCommandFunc(c *cli.Context) {
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conn, err := grpc.Dial(c.GlobalString("endpoint"))
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if err != nil {
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panic(err)
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}
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wAPI := pb.NewWatchClient(conn)
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wStream, err := wAPI.Watch(context.TODO())
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if err != nil {
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panic(err)
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}
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go recvLoop(wStream)
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reader := bufio.NewReader(os.Stdin)
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for {
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l, err := reader.ReadString('\n')
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error reading watch request line: %v", err)
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os.Exit(1)
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}
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l = strings.TrimSuffix(l, "\n")
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// TODO: support start and end revision
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segs := strings.Split(l, " ")
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if len(segs) != 2 {
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fmt.Fprintf(os.Stderr, "Invalid watch request format: use watch key or watchprefix prefix\n")
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continue
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}
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var r *pb.WatchRequest
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switch segs[0] {
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case "watch":
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r = &pb.WatchRequest{Key: []byte(segs[1])}
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case "watchprefix":
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r = &pb.WatchRequest{Prefix: []byte(segs[1])}
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default:
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fmt.Fprintf(os.Stderr, "Invalid watch request format: use watch key or watchprefix prefix\n")
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continue
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}
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err = wStream.Send(r)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error sending request to server: %v\n", err)
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}
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}
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}
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func recvLoop(wStream pb.Watch_WatchClient) {
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for {
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resp, err := wStream.Recv()
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if err == io.EOF {
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os.Exit(0)
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}
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if err != nil {
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panic(err)
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}
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fmt.Printf("%s: %s %s\n", resp.Event.Type, string(resp.Event.Kv.Key), string(resp.Event.Kv.Value))
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}
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}
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