log the exact reason why a path is closed

internal/core/path.go

@@ -275,7 +275,6 @@ func newPath(
 
 func (pa *path) close() {
 	pa.ctxCancel()
-	pa.log(logger.Info, "closed")
 }
 
 // Log is the main logging function.
@@ -317,7 +316,7 @@ func (pa *path) run() {
 		})
 	}
 
-outer:
+	err := func() error {
 		for {
 			select {
 			case <-pa.onDemandReadyTimer.C:
@@ -333,15 +332,15 @@ outer:
 
 				pa.onDemandCloseSource()
 
-			if pa.conf.Regexp != nil {
+				if pa.shouldClose() {
-				break outer
+					return fmt.Errorf("not in use")
 				}
 
 			case <-pa.onDemandCloseTimer.C:
 				pa.onDemandCloseSource()
 
-			if pa.conf.Regexp != nil {
+				if pa.shouldClose() {
-				break outer
+					return fmt.Errorf("not in use")
 				}
 
 			case req := <-pa.sourceStaticSetReady:
@@ -362,26 +361,22 @@ outer:
 				}
 				close(req.Res)
 
-			if pa.source == nil && pa.conf.Regexp != nil {
+				if pa.shouldClose() {
-				break outer
+					return fmt.Errorf("not in use")
 				}
 
 			case req := <-pa.describe:
 				pa.handleDescribe(req)
 
-			if pa.conf.Regexp != nil &&
+				if pa.shouldClose() {
-				pa.source == nil &&
+					return fmt.Errorf("not in use")
-				len(pa.readers) == 0 &&
-				len(pa.describeRequests) == 0 &&
-				len(pa.setupPlayRequests) == 0 {
-				break outer
 				}
 
 			case req := <-pa.publisherRemove:
 				pa.handlePublisherRemove(req)
 
-			if pa.source == nil && pa.conf.Regexp != nil {
+				if pa.shouldClose() {
-				break outer
+					return fmt.Errorf("not in use")
 				}
 
 			case req := <-pa.publisherAnnounce:
@@ -393,8 +388,8 @@ outer:
 			case req := <-pa.publisherPause:
 				pa.handlePublisherPause(req)
 
-			if pa.source == nil && pa.conf.Regexp != nil {
+				if pa.shouldClose() {
-				break outer
+					return fmt.Errorf("not in use")
 				}
 
 			case req := <-pa.readerRemove:
@@ -403,12 +398,8 @@ outer:
 			case req := <-pa.readerSetupPlay:
 				pa.handleReaderSetupPlay(req)
 
-			if pa.conf.Regexp != nil &&
+				if pa.shouldClose() {
-				pa.source == nil &&
+					return fmt.Errorf("not in use")
-				len(pa.readers) == 0 &&
-				len(pa.describeRequests) == 0 &&
-				len(pa.setupPlayRequests) == 0 {
-				break outer
 				}
 
 			case req := <-pa.readerPlay:
@@ -421,9 +412,10 @@ outer:
 				pa.handleAPIPathsList(req)
 
 			case <-pa.ctx.Done():
-			break outer
+				return fmt.Errorf("terminated")
 			}
 		}
+	}()
 
 	pa.ctxCancel()
 
@@ -470,9 +462,19 @@ outer:
 		pa.log(logger.Info, "runOnDemand command stopped")
 	}
 
+	pa.log(logger.Info, "closed (%v)", err)
+
 	pa.parent.onPathClose(pa)
 }
 
+func (pa *path) shouldClose() bool {
+	return pa.conf.Regexp != nil &&
+		pa.source == nil &&
+		len(pa.readers) == 0 &&
+		len(pa.describeRequests) == 0 &&
+		len(pa.setupPlayRequests) == 0
+}
+
 func (pa *path) hasStaticSource() bool {
 	return strings.HasPrefix(pa.conf.Source, "rtsp://") ||
 		strings.HasPrefix(pa.conf.Source, "rtsps://") ||