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119 lines
3.4 KiB
Go
119 lines
3.4 KiB
Go
package slack
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import (
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"encoding/json"
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"errors"
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"sync"
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"time"
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"github.com/gorilla/websocket"
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)
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const (
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// MaxMessageTextLength is the current maximum message length in number of characters as defined here
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// https://api.slack.com/rtm#limits
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MaxMessageTextLength = 4000
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)
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// RTM represents a managed websocket connection. It also supports
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// all the methods of the `Client` type.
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//
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// Create this element with Client's NewRTM() or NewRTMWithOptions(*RTMOptions)
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type RTM struct {
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idGen IDGenerator
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pingInterval time.Duration
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pingDeadman *time.Timer
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// Connection life-cycle
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conn *websocket.Conn
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IncomingEvents chan RTMEvent
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outgoingMessages chan OutgoingMessage
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killChannel chan bool
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disconnected chan struct{} // disconnected is closed when Disconnect is invoked, regardless of connection state. Allows for ManagedConnection to not leak.
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forcePing chan bool
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rawEvents chan json.RawMessage
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wasIntentional bool
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isConnected bool
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// Client is the main API, embedded
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Client
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websocketURL string
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// UserDetails upon connection
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info *Info
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// useRTMStart should be set to true if you want to use
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// rtm.start to connect to Slack, otherwise it will use
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// rtm.connect
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useRTMStart bool
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// dialer is a gorilla/websocket Dialer. If nil, use the default
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// Dialer.
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dialer *websocket.Dialer
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// mu is mutex used to prevent RTM connection race conditions
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mu *sync.Mutex
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}
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// RTMOptions allows configuration of various options available for RTM messaging
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//
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// This structure will evolve in time so please make sure you are always using the
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// named keys for every entry available as per Go 1 compatibility promise adding fields
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// to this structure should not be considered a breaking change.
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type RTMOptions struct {
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// UseRTMStart set to true in order to use rtm.start or false to use rtm.connect
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// As of 11th July 2017 you should prefer setting this to false, see:
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// https://api.slack.com/changelog/2017-04-start-using-rtm-connect-and-stop-using-rtm-start
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UseRTMStart bool
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}
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// Disconnect and wait, blocking until a successful disconnection.
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func (rtm *RTM) Disconnect() error {
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// avoid RTM disconnect race conditions
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rtm.mu.Lock()
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defer rtm.mu.Unlock()
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// always push into the disconnected channel when invoked,
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// this lets the ManagedConnection() function properly clean up.
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// if the buffer is full then just continue on.
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select {
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case rtm.disconnected <- struct{}{}:
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default:
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}
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if !rtm.isConnected {
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return errors.New("Invalid call to Disconnect - Slack API is already disconnected")
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}
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rtm.killChannel <- true
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return nil
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}
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// GetInfo returns the info structure received when calling
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// "startrtm", holding all channels, groups and other metadata needed
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// to implement a full chat client. It will be non-nil after a call to
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// StartRTM().
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func (rtm *RTM) GetInfo() *Info {
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return rtm.info
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}
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// SendMessage submits a simple message through the websocket. For
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// more complicated messages, use `rtm.PostMessage` with a complete
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// struct describing your attachments and all.
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func (rtm *RTM) SendMessage(msg *OutgoingMessage) {
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if msg == nil {
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rtm.Debugln("Error: Attempted to SendMessage(nil)")
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return
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}
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rtm.outgoingMessages <- *msg
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}
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func (rtm *RTM) resetDeadman() {
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timerReset(rtm.pingDeadman, deadmanDuration(rtm.pingInterval))
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}
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func deadmanDuration(d time.Duration) time.Duration {
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return d * 4
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}
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