package main import ( "fmt" "io" "os" "path" "time" "github.com/go-irc/irc" "github.com/pkg/errors" log "github.com/sirupsen/logrus" "gopkg.in/yaml.v2" ) type configFile struct { AutoMessages []*autoMessage `yaml:"auto_messages"` Channels []string `yaml:"channels"` PermitAllowModerator bool `yaml:"permit_allow_moderator"` PermitTimeout time.Duration `yaml:"permit_timeout"` RawLog string `yaml:"raw_log"` Rules []*Rule `yaml:"rules"` Variables map[string]interface{} `yaml:"variables"` rawLogWriter io.WriteCloser } func newConfigFile() *configFile { return &configFile{ PermitTimeout: time.Minute, } } func loadConfig(filename string) error { var ( err error tmpConfig *configFile ) switch path.Ext(filename) { case ".yaml", ".yml": tmpConfig, err = parseConfigFromYAML(filename) default: return errors.Errorf("Unknown config format %q", path.Ext(filename)) } if err != nil { return errors.Wrap(err, "parsing config") } if len(tmpConfig.Channels) == 0 { log.Warn("Loaded config with empty channel list") } if len(tmpConfig.Rules) == 0 { log.Warn("Loaded config with empty ruleset") } configLock.Lock() defer configLock.Unlock() tmpConfig.updateAutoMessagesFromConfig(config) tmpConfig.fixDurations() switch { case config != nil && config.RawLog == tmpConfig.RawLog: tmpConfig.rawLogWriter = config.rawLogWriter case tmpConfig.RawLog == "": if err = config.CloseRawMessageWriter(); err != nil { return errors.Wrap(err, "closing old raw log writer") } tmpConfig.rawLogWriter = writeNoOpCloser{io.Discard} default: if err = config.CloseRawMessageWriter(); err != nil { return errors.Wrap(err, "closing old raw log writer") } if err = os.MkdirAll(path.Dir(tmpConfig.RawLog), 0o755); err != nil { //nolint:gomnd // This is a common directory permission return errors.Wrap(err, "creating directories for raw log") } if tmpConfig.rawLogWriter, err = os.OpenFile(tmpConfig.RawLog, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644); err != nil { //nolint:gomnd // This is a common file permission return errors.Wrap(err, "opening raw log for appending") } } config = tmpConfig log.WithFields(log.Fields{ "auto_messages": len(config.AutoMessages), "rules": len(config.Rules), "channels": len(config.Channels), }).Info("Config file (re)loaded") return nil } func parseConfigFromYAML(filename string) (*configFile, error) { f, err := os.Open(filename) if err != nil { return nil, errors.Wrap(err, "open config file") } defer f.Close() var ( decoder = yaml.NewDecoder(f) tmpConfig = newConfigFile() ) decoder.SetStrict(true) if err = decoder.Decode(&tmpConfig); err != nil { return nil, errors.Wrap(err, "decode config file") } return tmpConfig, nil } func (c *configFile) CloseRawMessageWriter() error { if c == nil || c.rawLogWriter == nil { return nil } return c.rawLogWriter.Close() } func (c configFile) GetMatchingRules(m *irc.Message, event *string) []*Rule { configLock.RLock() defer configLock.RUnlock() var out []*Rule for _, r := range c.Rules { if r.matches(m, event) { out = append(out, r) } } return out } func (c configFile) LogRawMessage(m *irc.Message) error { _, err := fmt.Fprintln(c.rawLogWriter, m.String()) return errors.Wrap(err, "writing raw log message") } func (c *configFile) fixDurations() { // General fields c.PermitTimeout = c.fixedDuration(c.PermitTimeout) // Fix rules for _, r := range c.Rules { r.Cooldown = c.fixedDurationPtr(r.Cooldown) } // Fix auto-messages for _, a := range c.AutoMessages { a.TimeInterval = c.fixedDuration(a.TimeInterval) } } func (configFile) fixedDuration(d time.Duration) time.Duration { if d > time.Second { return d } return d * time.Second } func (configFile) fixedDurationPtr(d *time.Duration) *time.Duration { if d == nil || *d > time.Second { return d } fd := *d * time.Second return &fd } func (c *configFile) updateAutoMessagesFromConfig(old *configFile) { for idx, nam := range c.AutoMessages { // By default assume last message to be sent now // in order not to spam messages at startup nam.lastMessageSent = time.Now() if !nam.IsValid() { log.WithField("index", idx).Warn("Auto-Message configuration is invalid and therefore disabled") } if old == nil { // Initial config load, do not update timers continue } for _, oam := range old.AutoMessages { if nam.ID() != oam.ID() { continue } // We disable the old message as executing it would // mess up the constraints of the new message oam.lock.Lock() oam.disabled = true nam.lastMessageSent = oam.lastMessageSent nam.linesSinceLastMessage = oam.linesSinceLastMessage oam.lock.Unlock() } } }