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Fix file caching issue (slack). #572 (#575)

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This commit is contained in:
Patrick Connolly 2018-11-15 04:00:21 +08:00 committed by Wim
parent 16d5aeac7c
commit 09713d40ba
2 changed files with 24 additions and 13 deletions
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29
bridge/slack/handlers.go
View File

@ -132,7 +132,16 @@ func (b *Bslack) skipMessageEvent(ev *slack.MessageEvent) bool {
ev.SubMessage.Edited == nil {
return true
}
return false
return b.filesCached(ev.Files)
}
func (b *Bslack) filesCached(files []slack.File) bool {
for i := range files {
if !b.fileCached(&files[i]) {
return false
}
}
return true
}
// handleMessageEvent handles the message events. Together with any called sub-methods,
@ -248,10 +257,9 @@ func (b *Bslack) handleTypingEvent(ev *slack.UserTypingEvent) (*config.Message,
// handleDownloadFile handles file download
func (b *Bslack) handleDownloadFile(rmsg *config.Message, file *slack.File) error {
if b.fileIsAvailable(file) {
if b.fileCached(file) {
return nil
}
// Check that the file is neither too large nor blacklisted.
if err := helper.HandleDownloadSize(b.Log, rmsg, file.Name, int64(file.Size), b.General); err != nil {
b.Log.WithError(err).Infof("Skipping download of incoming file.")
@ -273,11 +281,18 @@ func (b *Bslack) handleDownloadFile(rmsg *config.Message, file *slack.File) erro
return nil
}
func (b *Bslack) fileIsAvailable(file *slack.File) bool {
// Only download a file if it is not in the cache or if it has been entered more than a minute ago.
if ts, ok := b.cache.Get("file" + file.ID); ok && time.Since(ts.(time.Time)) > time.Minute {
// fileCached implements Matterbridge's caching logic for files
// shared via Slack.
//
// We consider that a file was cached if its ID was added in the last minute or
// it's name was registered in the last 10 seconds. This ensures that an
// identically named file but with different content will be uploaded correctly
// (the assumption is that such name collisions will not occur within the given
// timeframes).
func (b *Bslack) fileCached(file *slack.File) bool {
if ts, ok := b.cache.Get("file" + file.ID); ok && time.Since(ts.(time.Time)) < time.Minute {
return true
} else if ts, ok = b.cache.Get("filename" + file.Name); ok && time.Since(ts.(time.Time)) > 10*time.Second {
} else if ts, ok = b.cache.Get("filename" + file.Name); ok && time.Since(ts.(time.Time)) < 10*time.Second {
return true
}
return false

8
bridge/slack/slack.go
View File

@ -384,9 +384,7 @@ func (b *Bslack) uploadFile(msg *config.Message, channelID string) {
// we can't match on the file ID yet, so we have to match on the filename too.
ts := time.Now()
b.Log.Debugf("Adding file %s to cache at %s with timestamp", fi.Name, ts.String())
if !b.cache.Add("filename"+fi.Name, ts) {
b.Log.Warnf("Failed to add file %s to cache at %s with timestamp", fi.Name, ts.String())
}
b.cache.Add("filename"+fi.Name, ts)
res, err := b.sc.UploadFile(slack.FileUploadParameters{
Reader: bytes.NewReader(*fi.Data),
Filename: fi.Name,
@ -399,9 +397,7 @@ func (b *Bslack) uploadFile(msg *config.Message, channelID string) {
}
if res.ID != "" {
b.Log.Debugf("Adding file ID %s to cache with timestamp %s", res.ID, ts.String())
if !b.cache.Add("file"+res.ID, ts) {
b.Log.Warnf("Failed to add file ID %s to cache with timestamp %s", res.ID, ts.String())
}
b.cache.Add("file"+res.ID, ts)
}
}
}