121 lines
3.3 KiB
Go
121 lines
3.3 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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"strconv"
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"strings"
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"github.com/coreos/etcd/Godeps/_workspace/src/github.com/spf13/cobra"
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"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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)
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// NewWatchCommand returns the cobra command for "watch".
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func NewWatchCommand() *cobra.Command {
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return &cobra.Command{
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Use: "watch",
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Short: "Watch watches the events happening or happened.",
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Run: watchCommandFunc,
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}
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}
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// watchCommandFunc executes the "watch" command.
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func watchCommandFunc(cmd *cobra.Command, args []string) {
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wStream, err := mustClient(cmd).Watch.Watch(context.TODO())
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if err != nil {
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ExitWithError(ExitBadConnection, 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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ExitWithError(ExitInvalidInput, fmt.Errorf("Error reading watch request line: %v", err))
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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]\", \"watchprefix [prefix]\" or \"cancel [watcher ID]\"\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{
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RequestUnion: &pb.WatchRequest_CreateRequest{
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CreateRequest: &pb.WatchCreateRequest{
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Key: []byte(segs[1])}}}
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case "watchprefix":
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r = &pb.WatchRequest{
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RequestUnion: &pb.WatchRequest_CreateRequest{
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CreateRequest: &pb.WatchCreateRequest{
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Prefix: []byte(segs[1])}}}
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case "cancel":
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id, perr := strconv.ParseInt(segs[1], 10, 64)
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if perr != nil {
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fmt.Fprintf(os.Stderr, "Invalid cancel ID (%v)\n", perr)
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continue
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}
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r = &pb.WatchRequest{
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RequestUnion: &pb.WatchRequest_CancelRequest{
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CancelRequest: &pb.WatchCancelRequest{
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WatchId: id}}}
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default:
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fmt.Fprintf(os.Stderr, "Invalid watch request type: use watch, watchprefix or cancel\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(ExitSuccess)
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}
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if err != nil {
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ExitWithError(ExitError, err)
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}
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switch {
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// TODO: handle canceled/compacted and other control response types
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case resp.Created:
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fmt.Printf("watcher created: id %08x\n", resp.WatchId)
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case resp.Canceled:
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fmt.Printf("watcher canceled: id %08x\n", resp.WatchId)
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default:
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for _, ev := range resp.Events {
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fmt.Printf("%s: %s %s\n", ev.Type, string(ev.Kv.Key), string(ev.Kv.Value))
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}
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}
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}
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}
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