InputStream: add static method OpenReady()

Merge some duplicate code.

src/InputStream.cxx

@@ -57,6 +57,28 @@ InputStream::Open(const char *url,
 	return nullptr;
 }
 
+InputStream *
+InputStream::OpenReady(const char *uri,
+		       Mutex &mutex, Cond &cond,
+		       Error &error)
+{
+	InputStream *is = Open(uri, mutex, cond, error);
+	if (is == nullptr)
+		return nullptr;
+
+	mutex.lock();
+	is->WaitReady();
+	bool success = is->Check(error);
+	mutex.unlock();
+
+	if (!success) {
+		is->Close();
+		is = nullptr;
+	}
+
+	return is;
+}
+
 bool
 InputStream::Check(Error &error)
 {

src/InputStream.hxx

@@ -118,6 +118,15 @@ struct InputStream {
 	static InputStream *Open(const char *uri, Mutex &mutex, Cond &cond,
 				 Error &error);
 
+	/**
+	 * Just like Open(), but waits for the stream to become ready.
+	 * It is a wrapper for Open(), WaitReady() and Check().
+	 */
+	gcc_malloc gcc_nonnull_all
+	static InputStream *OpenReady(const char *uri,
+				      Mutex &mutex, Cond &cond,
+				      Error &error);
+
 	/**
 	 * Close the input stream and free resources.
 	 *

src/PlaylistAny.cxx

@@ -41,7 +41,7 @@ playlist_open_remote(const char *uri, Mutex &mutex, Cond &cond,
 	}
 
 	Error error;
-	InputStream *is = InputStream::Open(uri, mutex, cond, error);
+	InputStream *is = InputStream::OpenReady(uri, mutex, cond, error);
 	if (is == nullptr) {
 		if (error.IsDefined())
 			FormatError(error, "Failed to open %s", uri);

src/PlaylistRegistry.cxx

@@ -269,9 +269,7 @@ playlist_list_open_stream_suffix(InputStream &is, const char *suffix)
 SongEnumerator *
 playlist_list_open_stream(InputStream &is, const char *uri)
 {
-	const char *suffix;
-
-	is.LockWaitReady();
+	assert(is.ready);
 
 	const char *const mime = is.GetMimeType();
 	if (mime != nullptr) {
@@ -280,7 +278,7 @@ playlist_list_open_stream(InputStream &is, const char *uri)
 			return playlist;
 	}
 
-	suffix = uri != nullptr ? uri_get_suffix(uri) : nullptr;
+	const char *suffix = uri != nullptr ? uri_get_suffix(uri) : nullptr;
 	if (suffix != nullptr) {
 		auto playlist = playlist_list_open_stream_suffix(is, suffix);
 		if (playlist != nullptr)
@@ -317,7 +315,7 @@ playlist_list_open_path(const char *path_fs, Mutex &mutex, Cond &cond,
 		return nullptr;
 
 	Error error;
-	InputStream *is = InputStream::Open(path_fs, mutex, cond, error);
+	InputStream *is = InputStream::OpenReady(path_fs, mutex, cond, error);
 	if (is == nullptr) {
 		if (error.IsDefined())
 			LogError(error);
@@ -325,8 +323,6 @@ playlist_list_open_path(const char *path_fs, Mutex &mutex, Cond &cond,
 		return nullptr;
 	}
 
-	is->LockWaitReady();
-
 	auto playlist = playlist_list_open_stream_suffix(*is, suffix);
 	if (playlist != nullptr)
 		*is_r = is;

src/TagFile.cxx

@@ -62,9 +62,9 @@ public:
 
 		/* open the InputStream (if not already open) */
 		if (is == nullptr) {
-			is = InputStream::Open(path_fs.c_str(),
-					       mutex, cond,
-					       IgnoreError());
+			is = InputStream::OpenReady(path_fs.c_str(),
+						    mutex, cond,
+						    IgnoreError());
 			if (is == nullptr)
 				return false;
 		} else

src/archive/Bzip2ArchivePlugin.cxx

@@ -146,7 +146,7 @@ bz2_open(const char *pathname, Error &error)
 {
 	static Mutex mutex;
 	static Cond cond;
-	InputStream *is = InputStream::Open(pathname, mutex, cond, error);
+	InputStream *is = InputStream::OpenReady(pathname, mutex, cond, error);
 	if (is == nullptr)
 		return nullptr;
 

src/playlist/SoundCloudPlaylistPlugin.cxx

@@ -254,8 +254,8 @@ soundcloud_parse_json(const char *url, yajl_handle hand,
 		      Mutex &mutex, Cond &cond)
 {
 	Error error;
-	InputStream *input_stream = InputStream::Open(url, mutex, cond,
-						      error);
+	InputStream *input_stream = InputStream::OpenReady(url, mutex, cond,
+							   error);
 	if (input_stream == nullptr) {
 		if (error.IsDefined())
 			LogError(error);
@@ -263,7 +263,6 @@ soundcloud_parse_json(const char *url, yajl_handle hand,
 	}
 
 	mutex.lock();
-	input_stream->WaitReady();
 
 	yajl_status stat;
 	int done = 0;