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slack.go
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slack.go
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package main
import (
"context"
"fmt"
"log"
"strconv"
"strings"
"sync"
"time"
"github.com/nlopes/slack"
"github.com/pkg/errors"
"github.com/satori/go.uuid"
)
type QuestionResponse struct {
msg slack.Msg
err error
}
type Slack struct {
apiClient *slack.Client
imChannelCache map[string]string
messageEventHandlers map[string]func(event *slack.MessageEvent)
messageEventHandlersLock sync.Mutex
BaseMessageParams slack.PostMessageParameters
}
func (s *Slack) StartRealTimeMessagingListener(ctx context.Context) {
rtm := s.apiClient.NewRTM()
go rtm.ManageConnection()
go func(rtm *slack.RTM) {
select {
case <-ctx.Done():
if err := rtm.Disconnect(); err != nil {
log.Printf("Error disconnecting from RTM channel: %v", err)
}
}
}(rtm)
for msg := range rtm.IncomingEvents {
switch event := msg.Data.(type) {
case *slack.MessageEvent:
go func() {
for _, handler := range s.messageEventHandlers {
go handler(event)
}
}()
case *slack.RTMError:
log.Printf("Error received on RTM channel: %v", event.Error())
case *slack.DisconnectedEvent:
log.Print("Disconnected from RTM channel")
return
}
}
}
// returns a uuid identifying the event handler that can be used with RemoveMessageEventHandler
func (s *Slack) AddMessageEventHandler(handler func(event *slack.MessageEvent)) (string, error) {
s.messageEventHandlersLock.Lock()
defer s.messageEventHandlersLock.Unlock()
uuid, err := uuid.NewV4()
if err != nil {
return "", errors.Wrap(err, "error creating uuid")
}
s.messageEventHandlers[uuid.String()] = handler
return uuid.String(), nil
}
func (s *Slack) RemoveMessageEventHandler(uuid string) {
s.messageEventHandlersLock.Lock()
defer s.messageEventHandlersLock.Unlock()
delete(s.messageEventHandlers, uuid)
}
func (s *Slack) GetChannelMembers(channelId string) (map[string]*slack.User, error) {
members := make(map[string]*slack.User)
channel, err := s.apiClient.GetChannelInfo(channelId)
if err != nil {
return members, fmt.Errorf("Error fetching channel info: %v", err)
}
for _, member := range channel.Members {
memberInfo, err := s.apiClient.GetUserInfo(member)
if err != nil {
return members, fmt.Errorf("Error getting member info for %s: %v", member, err)
}
members[member] = memberInfo
}
return members, nil
}
func (s *Slack) AskQuestion(member string, question string, ctx context.Context) QuestionResponse {
respChan := make(chan QuestionResponse, 0)
questionTs, err := s.SendMessage(member, question)
if err != nil {
return QuestionResponse{err: err}
}
handlerUuid, err := s.AddMessageEventHandler(func(event *slack.MessageEvent) {
eventTs, err := parseTimestamp(event.Timestamp)
if err != nil {
respChan <- QuestionResponse{err: err}
return
}
channel, err := s.GetChannelForMemberIm(member)
if err != nil {
respChan <- QuestionResponse{err: err}
}
// due to Slack's timestamp precision, it's possible for time.After to return false if the messages are
// sent close together enough, thus !time.Before is used.
if event.Channel == *channel && event.User == member && !eventTs.Before(*questionTs) {
respChan <- QuestionResponse{msg: event.Msg}
}
})
if err != nil {
return QuestionResponse{err: err}
}
select {
case resp := <-respChan:
s.RemoveMessageEventHandler(handlerUuid)
return resp
case <-ctx.Done():
s.RemoveMessageEventHandler(handlerUuid)
return QuestionResponse{err: fmt.Errorf("Context cancelled: %v", ctx.Err())}
}
}
func (s *Slack) GetChannelForMemberIm(member string) (*string, error) {
if channelId, ok := s.imChannelCache[member]; ok {
return &channelId, nil
}
_, _, channelId, err := s.apiClient.OpenIMChannel(member)
if err != nil {
return nil, fmt.Errorf("Error opening IM channel with user %s: %v", member, err)
}
s.imChannelCache[member] = channelId
return &channelId, nil
}
func (s *Slack) GetChannelIdForChannel(channelName string) (*string, error) {
channels, err := s.apiClient.GetChannels(true)
if err != nil {
return nil, fmt.Errorf("Error getting channel list: %v", err)
}
for _, channel := range channels {
if channel.Name == channelName {
return &channel.ID, nil
}
}
return nil, errors.New("Channel not found")
}
func (s *Slack) SendMessage(member string, msg string) (*time.Time, error) {
channel, err := s.GetChannelForMemberIm(member)
if err != nil {
return nil, fmt.Errorf("Error getting direct message channel for user %s: %v", member, err)
}
_, ts, err := s.apiClient.PostMessage(*channel, msg, s.BaseMessageParams)
if err != nil {
return nil, fmt.Errorf("Error sending message to user %s: %v", member, err)
}
return parseTimestamp(ts)
}
func parseTimestamp(timestamp string) (*time.Time, error) {
tsParts := strings.Split(timestamp, ".")
if len(tsParts) != 2 {
return nil, fmt.Errorf("Malformed unix timestamp: %s", timestamp)
}
secs, err := strconv.ParseInt(tsParts[0], 10, 64)
if err != nil {
return nil, fmt.Errorf("Malformed unix timestamp: %s", timestamp)
}
nanos, err := strconv.ParseInt(tsParts[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("Malformed unix timestamp: %s", timestamp)
}
ts := time.Unix(secs, nanos)
return &ts, nil
}