improve logs

builder/amazon/common/ssm_driver.go

@@ -70,22 +70,17 @@ func (d *SSMDriver) StartSession(ctx context.Context, input ssm.StartSessionInpu
 	d.retryConnection = make(chan bool, 1)
 	// Starts go routine that will keep listening to a retry channel and retry the session creation when needed.
 	// The log loop will add data to the retry channel whenever a retryable error happens to session.
-	// TODO @sylviamoss add max retry attempts
-	// TODO @sylviamoss zero retry times
 	go func(ctx context.Context, driver *SSMDriver, input ssm.StartSessionInput) {
-		retryTimes := 0
 		for {
 			select {
 			case <-ctx.Done():
 				return
 			case <-driver.retryConnection:
-				if retryTimes <= 11 {
-					retryTimes++
-					d.wg.Wait()
-					_, err := driver.StartSession(ctx, input)
-					if err != nil {
-						return
-					}
+				d.wg.Wait()
+				log.Printf("[DEBUG] Retrying to establish SSM connection")
+				_, err := driver.StartSession(ctx, input)
+				if err != nil {
+					return
 				}
 			}
 		}
@@ -148,9 +143,11 @@ func (d *SSMDriver) openTunnelForSession(ctx context.Context) error {
 				}
 
 				if output != "" {
-					log.Printf("[ERROR] %s: %s", prefix, output)
 					if isRetryableError(output) {
+						log.Printf("[ERROR] Retryable error - %s: %s", prefix, output)
 						d.retryConnection <- true
+					} else {
+						log.Printf("[ERROR] %s: %s", prefix, output)
 					}
 				}
 			case output, ok := <-stdoutCh:
@@ -186,9 +183,8 @@ func (d *SSMDriver) openTunnelForSession(ctx context.Context) error {
 
 func isRetryableError(output string) bool {
 	retryableError := []string{
-		"Unable to connect to specified port",
+		"connection refused",
 	}
-
 	for _, err := range retryableError {
 		if strings.Contains(output, err) {
 			return true