try fixing deadlock

contrib/backends/srndv2/src/srnd/daemon.go

@@ -874,7 +874,7 @@ func (self *NNTPDaemon) poll(worker int) {
 				// send to frontend
 				if self.frontend != nil {
 					if self.frontend.AllowNewsgroup(group) {
-						self.frontend.PostsChan() <- frontendPost{msgid, ref, group}
+						self.frontend.HandleNewPost(frontendPost{msgid, ref, group})
 					}
 				}
 			}

contrib/backends/srndv2/src/srnd/frontend.go

@@ -25,8 +25,8 @@ func (p frontendPost) Newsgroup() string {
 // frontend interface for any type of frontend
 type Frontend interface {
 
-	// channel that is for the frontend to pool for new posts from the nntpd
-	PostsChan() chan frontendPost
+	// handle new post from nntpd
+	HandleNewPost(p frontendPost)
 
 	// run mainloop
 	Mainloop()
@@ -36,6 +36,7 @@ type Frontend interface {
 
 	// trigger a manual regen of indexes for a root post
 	Regen(msg ArticleEntry)
+
 	// regenerate on mod event
 	RegenOnModEvent(newsgroup, msgid, root string, page int)
 }

contrib/backends/srndv2/src/srnd/frontend_http.go

@@ -171,13 +171,12 @@ func (lc *liveChan) handleMessage(front *httpFrontend, cmd *liveCommand) {
 }
 
 type httpFrontend struct {
-	modui        ModUI
-	httpmux      *mux.Router
-	daemon       *NNTPDaemon
-	cache        CacheInterface
-	recvpostchan chan frontendPost
-	bindaddr     string
-	name         string
+	modui    ModUI
+	httpmux  *mux.Router
+	daemon   *NNTPDaemon
+	cache    CacheInterface
+	bindaddr string
+	name     string
 
 	secret string
 
@@ -222,10 +221,6 @@ func (self httpFrontend) AllowNewsgroup(group string) bool {
 	return newsgroupValidFormat(group) || group == "ctl" && !strings.HasSuffix(group, ".")
 }
 
-func (self httpFrontend) PostsChan() chan frontendPost {
-	return self.recvpostchan
-}
-
 func (self *httpFrontend) Regen(msg ArticleEntry) {
 	self.cache.Regen(msg)
 }
@@ -406,33 +401,33 @@ func (self *httpFrontend) poll() {
 			} else {
 				log.Println("failed to register mod message, file was not opened")
 			}
-		case nntp := <-self.recvpostchan:
-			// get root post and tell frontend to regen that thread
-			msgid := nntp.MessageID()
-			group := nntp.Newsgroup()
-			ref := nntp.Reference()
-			self.informLiveUI(msgid, ref, group)
-			if len(ref) > 0 {
-				msgid = ref
-			}
-			entry := ArticleEntry{msgid, group}
-			// regnerate thread
-			self.regenThreadChan <- entry
-			// regen the newsgroup we're in
-			// TODO: regen only what we need to
-			pages := self.daemon.database.GetGroupPageCount(group)
-			// regen all pages
-			var page int64
-			for ; page < pages; page++ {
-				req := groupRegenRequest{
-					group: group,
-					page:  int(page),
-				}
-				self.regenGroupChan <- req
-			}
 		}
 	}
 }
+func (self *httpFrontend) HandleNewPost(nntp frontendPost) {
+	msgid := nntp.MessageID()
+	group := nntp.Newsgroup()
+	ref := nntp.Reference()
+	go self.informLiveUI(msgid, ref, group)
+	if len(ref) > 0 {
+		msgid = ref
+	}
+	entry := ArticleEntry{msgid, group}
+	// regnerate thread
+	self.regenThreadChan <- entry
+	// regen the newsgroup we're in
+	// TODO: regen only what we need to
+	pages := self.daemon.database.GetGroupPageCount(group)
+	// regen all pages
+	var page int64
+	for ; page < pages; page++ {
+		req := groupRegenRequest{
+			group: group,
+			page:  int(page),
+		}
+		self.regenGroupChan <- req
+	}
+}
 
 // create a new captcha, return as json object
 func (self *httpFrontend) new_captcha_json(wr http.ResponseWriter, r *http.Request) {
@@ -1569,7 +1564,7 @@ func NewHTTPFrontend(daemon *NNTPDaemon, cache CacheInterface, config map[string
 		Path:   front.prefix,
 		MaxAge: 600,
 	}
-	front.recvpostchan = make(chan frontendPost)
+
 	front.regenThreadChan = front.cache.GetThreadChan()
 	front.regenGroupChan = front.cache.GetGroupChan()
 

contrib/backends/srndv2/src/srnd/frontend_multi.go

@@ -7,8 +7,7 @@ package srnd
 
 // muxed frontend for holding many frontends
 type multiFrontend struct {
-	muxedpostchan chan frontendPost
-	frontends     []Frontend
+	frontends []Frontend
 }
 
 func (self multiFrontend) AllowNewsgroup(newsgroup string) bool {
@@ -25,25 +24,12 @@ func (self multiFrontend) Mainloop() {
 	for idx := range self.frontends {
 		go self.frontends[idx].Mainloop()
 	}
-
-	// poll for incoming
-	chnl := self.PostsChan()
-	for {
-		select {
-		case nntp := <-chnl:
-			for _, frontend := range self.frontends {
-				if frontend.AllowNewsgroup(nntp.Newsgroup()) {
-					ch := frontend.PostsChan()
-					ch <- nntp
-				}
-			}
-			break
-		}
-	}
 }
 
-func (self multiFrontend) PostsChan() chan frontendPost {
-	return self.muxedpostchan
+func (self multiFrontend) HandleNewPost(nntp frontendPost) {
+	for idx := range self.frontends {
+		self.frontends[idx].HandleNewPost(nntp)
+	}
 }
 
 func (self multiFrontend) RegenOnModEvent(newsgroup, msgid, root string, page int) {
@@ -54,7 +40,6 @@ func (self multiFrontend) RegenOnModEvent(newsgroup, msgid, root string, page in
 
 func MuxFrontends(fronts ...Frontend) Frontend {
 	var front multiFrontend
-	front.muxedpostchan = make(chan frontendPost, 64)
 	front.frontends = fronts
 	return front
 }