mirror of
https://github.com/google/alertmanager-irc-relay.git
synced 2024-11-05 11:19:21 +01:00
110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
// Copyright 2021 Google LLC
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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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// https://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 main
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import (
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"context"
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"log"
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"sync"
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"time"
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irc "github.com/fluffle/goirc/client"
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)
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type channelState struct {
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Channel IRCChannel
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BackoffCounter Delayer
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}
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type ChannelReconciler struct {
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preJoinChannels []IRCChannel
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client *irc.Conn
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delayerMaker DelayerMaker
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channels map[string]*channelState
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stopCtx context.Context
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stopCtxCancel context.CancelFunc
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stopWg sync.WaitGroup
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mu sync.Mutex
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}
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func NewChannelReconciler(config *Config, client *irc.Conn, delayerMaker DelayerMaker) *ChannelReconciler {
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reconciler := &ChannelReconciler{
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preJoinChannels: config.IRCChannels,
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client: client,
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delayerMaker: delayerMaker,
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channels: make(map[string]*channelState),
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}
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reconciler.registerHandlers()
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return reconciler
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}
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func (r *ChannelReconciler) registerHandlers() {
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r.client.HandleFunc(irc.KICK,
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func(_ *irc.Conn, line *irc.Line) {
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r.HandleKick(line.Args[1], line.Args[0])
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})
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}
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func (r *ChannelReconciler) HandleKick(nick string, channel string) {
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if nick != r.client.Me().Nick {
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// received kick info for somebody else
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return
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}
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state, ok := r.channels[channel]
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if !ok {
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log.Printf("Being kicked out of non-joined channel (%s), ignoring", channel)
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return
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}
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log.Printf("Being kicked out of %s, re-joining", channel)
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go func() {
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if ok := state.BackoffCounter.DelayContext(r.stopCtx); !ok {
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return
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}
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r.client.Join(state.Channel.Name, state.Channel.Password)
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}()
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}
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func (r *ChannelReconciler) CleanupChannels() {
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log.Printf("Deregistering all channels.")
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r.channels = make(map[string]*channelState)
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}
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func (r *ChannelReconciler) JoinChannel(channel *IRCChannel) {
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if _, joined := r.channels[channel.Name]; joined {
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return
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}
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log.Printf("Joining %s", channel.Name)
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r.client.Join(channel.Name, channel.Password)
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state := &channelState{
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Channel: *channel,
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BackoffCounter: r.delayerMaker.NewDelayer(
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ircConnectMaxBackoffSecs, ircConnectBackoffResetSecs,
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time.Second),
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}
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r.channels[channel.Name] = state
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}
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func (r *ChannelReconciler) JoinChannels() {
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for _, channel := range r.preJoinChannels {
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r.JoinChannel(&channel)
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}
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}
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