[spotify] Trigger scan after retrieving a valid access token from the

webinterface

Library now offers the function "library_exec_async". This allows
library sources to offer functions that will be executed in
the library thread. Useful to allow partial scans of only one source.

src/library.c

@@ -689,6 +689,21 @@ library_is_exiting()
   return scan_exit;
 }
 
+/*
+ * Execute the function 'func' with the given argument 'arg' in the library thread.
+ *
+ * The pointer passed as argument is freed in the library thread after func returned.
+ *
+ * @param func The function to be executed
+ * @param arg Argument passed to func
+ * @return 0 if triggering the function execution succeeded, -1 on failure.
+ */
+int
+library_exec_async(command_function func, void *arg)
+{
+  return commands_exec_async(cmdbase, func, arg);
+}
+
 static void *
 library(void *arg)
 {

src/library.h

@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <time.h>
 
+#include "commands.h"
 #include "db.h"
 
 /*
@@ -88,6 +89,9 @@ library_set_scanning(bool is_scanning);
 bool
 library_is_exiting();
 
+int
+library_exec_async(command_function func, void *arg);
+
 int
 library_init();
 

src/spotify.c

@@ -413,6 +413,9 @@ fptr_assign_all()
 // End of ugly part
 
 
+static enum command_state
+scan_webapi(void *arg, int *ret);
+
 /* ------------------------------- MISC HELPERS ---------------------------- */
 
 static int
@@ -1993,7 +1996,8 @@ spotify_oauth_callback(struct evbuffer *evbuf, struct evkeyvalq *param, const ch
   // Received a valid access token
   spotify_access_token_valid = true;
 
-  // TODO Trigger init-scan after successful access to spotifywebapi
+  // Trigger scan after successful access to spotifywebapi
+  library_exec_async(scan_webapi, NULL);
 
   evbuffer_add_printf(evbuf, "ok, all done</p>\n");
 
@@ -2312,6 +2316,14 @@ fullrescan()
   return 0;
 }
 
+/* Thread: httpd */
+static enum command_state
+scan_webapi(void *arg, int *ret)
+{
+  *ret = rescan();
+  return COMMAND_END;
+}
+
 /* Thread: main */
 int
 spotify_init(void)