author | Mikael Berthe <mikael@lilotux.net> |
Sat, 13 May 2017 11:56:52 +0200 | |
changeset 131 | 6461e0637767 |
parent 112 | 58d30ab47543 |
child 144 | 15ecc49bbb25 |
permissions | -rw-r--r-- |
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// Copyright © 2017 Mikael Berthe <mikael@lilotux.net> |
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// |
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// Licensed under the MIT license. |
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// Please see the LICENSE file is this directory. |
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package cmd |
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import ( |
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"io" |
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"os" |
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"strings" |
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"github.com/pkg/errors" |
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"github.com/spf13/cobra" |
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"github.com/McKael/madon" |
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) |
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var streamOpts struct { |
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command string |
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} |
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// Maximum number of websockets (1 hashtag <=> 1 ws) |
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const maximumHashtagStreamWS = 4 |
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// streamCmd represents the stream command |
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var streamCmd = &cobra.Command{ |
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Use: "stream [user|local|public|:HASHTAG]", |
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Short: "Listen to an event stream", |
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Long: ` |
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The stream command stays connected to the server and listen to a stream of |
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events (user, local or federated). |
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It can also get a hashtag-based stream if the keyword or prefixed with |
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':' or '#'.`, |
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Example: ` madonctl stream # User timeline stream |
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madonctl stream local # Local timeline stream |
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madonctl stream public # Public timeline stream |
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madonctl stream :mastodon # Hashtag |
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madonctl stream #madonctl |
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Several (up to 4) hashtags can be given. |
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Note: madonctl will use 1 websocket per hashtag stream. |
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madonctl stream #madonctl,#mastodon,#golang |
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madonctl stream :madonctl,mastodon,api`, |
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RunE: streamRunE, |
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ValidArgs: []string{"user", "public"}, |
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ArgAliases: []string{"home"}, |
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} |
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func init() { |
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RootCmd.AddCommand(streamCmd) |
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streamCmd.Flags().StringVar(&streamOpts.command, "command", "", "Execute external command") |
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} |
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func streamRunE(cmd *cobra.Command, args []string) error { |
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streamName := "user" |
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tag := "" |
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var hashTagList []string |
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if len(args) > 0 { |
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if len(args) != 1 { |
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return errors.New("too many parameters") |
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} |
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arg := args[0] |
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switch arg { |
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case "", "user": |
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case "public": |
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streamName = arg |
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case "local": |
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streamName = "public:local" |
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default: |
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if arg[0] != ':' && arg[0] != '#' { |
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return errors.New("invalid argument") |
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} |
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streamName = "hashtag" |
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tag = arg[1:] |
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if len(tag) == 0 { |
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return errors.New("empty hashtag") |
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} |
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hashTagList = strings.Split(tag, ",") |
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for i, h := range hashTagList { |
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if h[0] == ':' || h[0] == '#' { |
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hashTagList[i] = h[1:] |
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} |
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if h == "" { |
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return errors.New("empty hashtag") |
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} |
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} |
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if len(hashTagList) > maximumHashtagStreamWS { |
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return errors.Errorf("too many hashtags, maximum is %d", maximumHashtagStreamWS) |
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} |
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} |
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} |
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if err := madonInit(true); err != nil { |
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return err |
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} |
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evChan := make(chan madon.StreamEvent, 10) |
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stop := make(chan bool) |
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done := make(chan bool) |
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var err error |
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if streamName != "hashtag" || len(hashTagList) <= 1 { // Usual case: Only 1 stream |
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err = gClient.StreamListener(streamName, tag, evChan, stop, done) |
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} else { // Several streams |
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n := len(hashTagList) |
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tagEvCh := make([]chan madon.StreamEvent, n) |
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tagDoneCh := make([]chan bool, n) |
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for i, t := range hashTagList { |
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if verbose { |
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errPrint("Launching listener for tag '%s'", t) |
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} |
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tagEvCh[i] = make(chan madon.StreamEvent) |
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tagDoneCh[i] = make(chan bool) |
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e := gClient.StreamListener(streamName, t, tagEvCh[i], stop, tagDoneCh[i]) |
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if e != nil { |
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if i > 0 { // Close previous connections |
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close(stop) |
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} |
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err = e |
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break |
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} |
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// Forward events to main ev channel |
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go func(i int) { |
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for { |
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select { |
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case _, ok := <-tagDoneCh[i]: |
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if !ok { // end of streaming for this tag |
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done <- true |
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return |
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} |
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case ev := <-tagEvCh[i]: |
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evChan <- ev |
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} |
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} |
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}(i) |
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} |
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} |
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if err != nil { |
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errPrint("Error: %s", err.Error()) |
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os.Exit(1) |
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} |
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p, err := getPrinter() |
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148 |
if err != nil { |
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149 |
close(stop) |
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<-done |
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close(evChan) |
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errPrint("Error: %s", err.Error()) |
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os.Exit(1) |
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} |
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// Set up external command |
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p.setCommand(streamOpts.command) |
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LISTEN: |
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for { |
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select { |
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case v, ok := <-done: |
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if !ok || v == true { // done is closed, end of streaming |
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break LISTEN |
165 |
} |
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166 |
case ev := <-evChan: |
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167 |
switch ev.Event { |
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168 |
case "error": |
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169 |
if ev.Error != nil { |
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170 |
if ev.Error == io.ErrUnexpectedEOF { |
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171 |
errPrint("The stream connection was unexpectedly closed") |
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172 |
continue |
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173 |
} |
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174 |
errPrint("Error event: [%s] %s", ev.Event, ev.Error) |
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175 |
continue |
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176 |
} |
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177 |
errPrint("Event: [%s]", ev.Event) |
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178 |
case "update": |
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179 |
s := ev.Data.(madon.Status) |
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if err = p.printObj(&s); err != nil { |
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181 |
break LISTEN |
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182 |
} |
0 | 183 |
continue |
184 |
case "notification": |
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185 |
n := ev.Data.(madon.Notification) |
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if p.printObj(&n); err != nil { |
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187 |
break LISTEN |
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188 |
} |
0 | 189 |
continue |
190 |
case "delete": |
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191 |
// TODO PrintObj ? |
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errPrint("Event: [%s] Status %d was deleted", ev.Event, ev.Data.(int64)) |
0 | 193 |
default: |
194 |
errPrint("Unhandled event: [%s] %T", ev.Event, ev.Data) |
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195 |
} |
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196 |
} |
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197 |
} |
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close(stop) |
0 | 199 |
close(evChan) |
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if err != nil { |
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errPrint("Error: %s", err.Error()) |
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os.Exit(1) |
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} |
0 | 204 |
return nil |
205 |
} |