From 1ec6ff8ec85ea4597b4897f1d2f1a89ec5e1abb1 Mon Sep 17 00:00:00 2001
From: Grail Finder <wohilas@gmail.com>
Date: Sat, 18 Feb 2023 21:10:50 +0600
Subject: Feat: close channel before iterating

---
 main.go    | 12 +++++++++---
 workers.go | 15 +++++++++++----
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/main.go b/main.go
index 5f738aa..aa90be3 100644
--- a/main.go
+++ b/main.go
@@ -188,6 +188,7 @@ func main() {
 	// === concurrent ===
 	queue := make(chan *Utterance, len(utterances))
 	geshaft := make(chan *Utterance, len(utterances))
+	done := make(chan bool, 1)
 
 	for _, ut := range utterances {
 		if _, err := os.Stat(ut.OutPath); os.IsNotExist(err) {
@@ -204,23 +205,28 @@ func main() {
 
 	workers := 100
 	for i := 0; i < workers; i++ {
-		go worker(queue, i, geshaft)
+		go worker(queue, done, i, geshaft)
 	}
 
 	for {
 		if len(queue) == 0 {
+			fmt.Println("empty queue: sending true to done")
+			done <- true
 			// give time for workers to finish
-			time.Sleep(3 * time.Second)
+			fmt.Println("sleeping for few seconds")
+			time.Sleep(5 * time.Second)
+			fmt.Println("closing queue")
 			close(queue)
+			fmt.Println("breaking from the loop")
 			break
 		}
 		time.Sleep(1 * time.Second)
 	}
 
+	close(geshaft)
 	for ut := range geshaft {
 		filteredUtterances = append(filteredUtterances, ut)
 	}
-	close(geshaft)
 	newMeta := utterancesToFileTextMap(filteredUtterances)
 	writeCSV(mapToCSV(newMeta))
 }
diff --git a/workers.go b/workers.go
index 6fa4835..03c9072 100644
--- a/workers.go
+++ b/workers.go
@@ -2,15 +2,22 @@ package main
 
 import "fmt"
 
-func worker(queue chan *Utterance, worknumber int, geshaft chan *Utterance) {
+func worker(queue chan *Utterance, done chan bool, worknumber int, geshaft chan *Utterance) {
 	for {
 		if len(queue) == 0 {
 			fmt.Println("empty queue, number", worknumber)
 			return
 		}
-		ut := <-queue
-		if err := cutoutClipAndTranscode(ut); err == nil {
-			geshaft <- ut
+		select {
+
+		case ut := <-queue:
+			if err := cutoutClipAndTranscode(ut); err == nil {
+				geshaft <- ut
+			}
+
+		case <-done:
+			fmt.Println("done signal, number", worknumber)
+			return
 		}
 	}
 }
-- 
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