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Merge pull request #21 from vektorlab/add-streaming
Add streaming
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "sync" | ||
| ) | ||
|
|
||
| type StreamQ struct { | ||
| queue []string | ||
| lock sync.RWMutex | ||
| } | ||
|
|
||
| func newStreamQ() *StreamQ { | ||
| return &StreamQ{ | ||
| queue: []string{}, | ||
| lock: sync.RWMutex{}, | ||
| } | ||
| } | ||
|
|
||
| func (q *StreamQ) add(line string) { | ||
| q.lock.Lock() | ||
| q.queue = append(q.queue, line) | ||
| q.lock.Unlock() | ||
| } | ||
|
|
||
| func (q *StreamQ) isEmpty() bool { | ||
| return (len(q.queue) < 1) | ||
| } | ||
|
|
||
| func (q *StreamQ) flush() []string { | ||
| q.lock.Lock() | ||
| items := q.queue | ||
| q.queue = []string{} | ||
| q.lock.Unlock() | ||
| return items | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "os/signal" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/bluele/slack" | ||
| ) | ||
|
|
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| type SlackCat struct { | ||
| api *slack.Slack | ||
| opts *slack.ChatPostMessageOpt | ||
| queue *StreamQ | ||
| shutdown chan os.Signal | ||
| channelName string | ||
| channelId string | ||
| } | ||
|
|
||
| func newSlackCat(token, channelName string) (*SlackCat, error) { | ||
| sc := &SlackCat{ | ||
| api: slack.New(token), | ||
| opts: &slack.ChatPostMessageOpt{AsUser: true}, | ||
| queue: newStreamQ(), | ||
| shutdown: make(chan os.Signal, 1), | ||
| channelName: channelName, | ||
| } | ||
| err := sc.lookupSlackId() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| signal.Notify(sc.shutdown, os.Interrupt) | ||
| return sc, nil | ||
| } | ||
|
|
||
| func (sc *SlackCat) trap() { | ||
| sigcount := 0 | ||
| for sig := range sc.shutdown { | ||
| if sigcount > 0 { | ||
| exitErr(fmt.Errorf("aborted")) | ||
| } | ||
| output(fmt.Sprintf("got signal: %s", sig.String())) | ||
| output("press ctrl+c again to exit immediately") | ||
| sigcount++ | ||
| go sc.exit() | ||
| } | ||
| } | ||
|
|
||
| func (sc *SlackCat) exit() { | ||
| for { | ||
| if sc.queue.isEmpty() { | ||
| os.Exit(0) | ||
| } else { | ||
| output("flushing remaining messages to Slack...") | ||
| time.Sleep(3 * time.Second) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| //Lookup Slack id for channel, group, or im | ||
| func (sc *SlackCat) lookupSlackId() error { | ||
| api := sc.api | ||
| channel, err := api.FindChannelByName(sc.channelName) | ||
| if err == nil { | ||
| sc.channelId = channel.Id | ||
| return nil | ||
| } | ||
| group, err := api.FindGroupByName(sc.channelName) | ||
| if err == nil { | ||
| sc.channelId = group.Id | ||
| return nil | ||
| } | ||
| im, err := api.FindImByName(sc.channelName) | ||
| if err == nil { | ||
| sc.channelId = im.Id | ||
| return nil | ||
| } | ||
| fmt.Println(err) | ||
| return fmt.Errorf("No such channel, group, or im") | ||
| } | ||
|
|
||
| func (sc *SlackCat) addToStreamQ(lines chan string) { | ||
| for line := range lines { | ||
| sc.queue.add(line) | ||
| } | ||
| sc.exit() | ||
| } | ||
|
|
||
| //TODO: handle messages with length exceeding maximum for Slack chat | ||
| func (sc *SlackCat) processStreamQ(noop bool) { | ||
| if !(sc.queue.isEmpty()) { | ||
| msglines := sc.queue.flush() | ||
| if noop { | ||
| output(fmt.Sprintf("skipped posting of %s message lines to %s", strconv.Itoa(len(msglines)), sc.channelName)) | ||
| } else { | ||
| sc.postMsg(msglines) | ||
| } | ||
| } | ||
| time.Sleep(3 * time.Second) | ||
| sc.processStreamQ(noop) | ||
| } | ||
|
|
||
| func (sc *SlackCat) postMsg(msglines []string) { | ||
| msg := fmt.Sprintf("```%s```", strings.Join(msglines, "\n")) | ||
| err := sc.api.ChatPostMessage(sc.channelId, msg, sc.opts) | ||
| failOnError(err, "", true) | ||
| output(fmt.Sprintf("posted %s message lines to %s", strconv.Itoa(len(msglines)), sc.channelName)) | ||
| } | ||
|
|
||
| func (sc *SlackCat) postFile(filePath, fileName string, noop bool) { | ||
| //default to timestamp for filename | ||
| if fileName == "" { | ||
| fileName = strconv.FormatInt(time.Now().Unix(), 10) | ||
| } | ||
|
|
||
| if noop { | ||
| output(fmt.Sprintf("skipping upload of file %s to %s", fileName, sc.channelName)) | ||
| } | ||
|
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| start := time.Now() | ||
| err := sc.api.FilesUpload(&slack.FilesUploadOpt{ | ||
| Filepath: filePath, | ||
| Filename: fileName, | ||
| Title: fileName, | ||
| Channels: []string{sc.channelId}, | ||
| }) | ||
| failOnError(err, "error uploading file to Slack", true) | ||
| duration := strconv.FormatFloat(time.Since(start).Seconds(), 'f', 3, 64) | ||
| output(fmt.Sprintf("file %s uploaded to %s (%ss)", fileName, sc.channelName, duration)) | ||
| os.Exit(0) | ||
| } |