From 493ad1a723f9ade3bd049b156f0dc4d194f8fd3e Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Thu, 8 Sep 2022 01:14:20 +0800
Subject: Completely fix timing of goroutines. Implement graceful shutdown
 correctly.

---
 common/retry.go | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

(limited to 'common')

diff --git a/common/retry.go b/common/retry.go
index 6b97ff3..435d407 100644
--- a/common/retry.go
+++ b/common/retry.go
@@ -1,6 +1,7 @@
 package common
 
 import (
+	"context"
 	"log"
 	"time"
 )
@@ -10,6 +11,7 @@ import (
 // the last error will be returned.
 // If logger is not nil, retry information will be printed to it.
 func AutoRetry[T any](
+	ctx context.Context,
 	supplier func() (T, error),
 	maxRetryTimes int,
 	retryInterval time.Duration,
@@ -22,8 +24,16 @@ func AutoRetry[T any](
 				logger.Printf("Try %v/%v (sleep %vs): %v\n",
 					i, maxRetryTimes, retryInterval, err)
 			}
-			time.Sleep(retryInterval)
-			continue
+			timer := time.NewTimer(retryInterval)
+			select {
+			case <-timer.C:
+				// time to have the next try
+				continue
+			case <-ctx.Done():
+				// context is cancelled
+				var zero T
+				return zero, ctx.Err()
+			}
 		}
 		// success
 		return ret, nil
@@ -31,5 +41,6 @@ func AutoRetry[T any](
 	if logger != nil {
 		logger.Printf("Max retry times reached, but it still fails. Last error: %v", err)
 	}
-	return *new(T), err
+	var zero T
+	return zero, err
 }
-- 
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