[Asterisk-code-review] media_cache: Don't lock when curl the remote file (asterisk[master])

[Andre Barbosa]

Andre Barbosa has uploaded this change for review. ( https://gerrit.asterisk.org/c/asterisk/+/16233 )


Change subject: media_cache: Don't lock when curl the remote file
......................................................................

media_cache: Don't lock when curl the remote file

When playing a remote sound file, which is not in cache, first we need to download
it with ast_bucket_file_retrieve.

This can take a while if the remote host is slow. The current CURL timeout is
180secs, so in extreme situations, it can take 3 minutes to return.

Because ast_media_cache_retrieve has a lock on all function, while we are waiting
for the delayed download, Asterisk is not able to play any more files, even the
files already cached locally.

ASTERISK-29544 #close

Change-Id: I8d4142b463ae4a1d4c41bff2bf63324821567408
---
M main/media_cache.c
1 file changed, 18 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/33/16233/1

diff --git a/main/media_cache.c b/main/media_cache.c
index 1899fb4..5a6986e 100644
--- a/main/media_cache.c
+++ b/main/media_cache.c
@@ -158,12 +158,13 @@
 {
 	struct ast_bucket_file *bucket_file;
 	char *ext;
-	SCOPED_AO2LOCK(media_lock, media_cache);
-
 	if (ast_strlen_zero(uri)) {
 		return -1;
 	}
 
+	ao2_lock(media_cache);
+	ast_debug(5, "Looking for media at local cache, file: %s\n", uri);
+
 	/* First, retrieve from the ao2 cache here. If we find a bucket_file
 	 * matching the requested URI, ask the appropriate backend if it is
 	 * stale. If not; return it.
@@ -179,6 +180,7 @@
 			ao2_ref(bucket_file, -1);
 
 			ast_debug(5, "Returning media at local file: %s\n", file_path);
+			ao2_unlock(media_cache);
 			return 0;
 		}
 
@@ -187,6 +189,8 @@
 		ast_bucket_file_delete(bucket_file);
 		ao2_ref(bucket_file, -1);
 	}
+	// we unlock to curl the file
+	ao2_unlock(media_cache);
 
 	/* Either this is new or the resource is stale; do a full retrieve
 	 * from the appropriate bucket_file backend
@@ -197,6 +201,17 @@
 		return -1;
 	}
 
+	//we lock again, before updating cache
+	ao2_lock(media_cache);
+
+	/* We can have duplicated buckets here, we check if already exists
+	 * before saving
+	 */
+	if (ast_media_cache_exists(uri)) {
+		ao2_unlock(media_cache);
+		return 0;
+	}
+
 	/* We can manipulate the 'immutable' bucket_file here, as we haven't
 	 * let anyone know of its existence yet
 	 */
@@ -210,6 +225,7 @@
 	ao2_ref(bucket_file, -1);
 
 	ast_debug(5, "Returning media at local file: %s\n", file_path);
+	ao2_unlock(media_cache);
 
 	return 0;
 }

-- 
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Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Change-Id: I8d4142b463ae4a1d4c41bff2bf63324821567408
Gerrit-Change-Number: 16233
Gerrit-PatchSet: 1
Gerrit-Owner: Andre Barbosa <andre.emanuel.barbosa at gmail.com>
Gerrit-MessageType: newchange
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