Slight changes to watcher

Configurable scan delay
Test friendliness

README.md

@@ -79,7 +79,7 @@ Configuration files must respect a structure similar to Windows INI file, with
 
 The sample configuration (`config.sample`) looks like this:
 
-```
+```ini
 [base]
 ; A Storm database URI. See the 'schema' folder for schema creation scripts
 ; Default: sqlite:///tmp/supysonic/supysonic.db
@@ -107,6 +107,11 @@ log_level = WARNING
 ;mount_webui = on
 
 [daemon]
+; Delay before triggering scanning operation after a change have been detected
+; This prevents running too many scans when multiple changes are detected for a
+; single file over a short time span. Default: 5
+wait_delay = 5
+
 ; Optional rotating log file for the scanner daemon
 log_file = /var/supysonic/supysonic-daemon.log
 log_level = INFO

config.sample

@@ -25,6 +25,11 @@ log_level = WARNING
 ;mount_webui = on
 
 [daemon]
+; Delay before triggering scanning operation after a change have been detected
+; This prevents running too many scans when multiple changes are detected for a
+; single file over a short time span. Default: 5
+wait_delay = 5
+
 ; Optional rotating log file for the scanner daemon
 log_file = /var/supysonic/supysonic-daemon.log
 log_level = INFO

supysonic/config.py

@@ -32,6 +32,7 @@ class DefaultConfig(object):
         'mount_api': True
     }
     DAEMON = {
+        'wait_delay': 5,
         'log_file': None,
         'log_level': 'WARNING'
     }
@@ -68,12 +69,15 @@ class IniConfig(DefaultConfig):
         try:
             return int(value)
         except ValueError:
-            lv = value.lower()
-            if lv in ('yes', 'true', 'on'):
-                return True
-            elif lv in ('no', 'false', 'off'):
-                return False
-            return value
+            try:
+                return float(value)
+            except ValueError:
+                lv = value.lower()
+                if lv in ('yes', 'true', 'on'):
+                    return True
+                elif lv in ('no', 'false', 'off'):
+                    return False
+                return value
 
     @classmethod
     def from_common_locations(cls):

supysonic/watcher.py

@@ -108,10 +108,11 @@ class Event(object):
         return self.__src
 
 class ScannerProcessingQueue(Thread):
-    def __init__(self, database_uri, logger):
+    def __init__(self, database_uri, delay, logger):
         super(ScannerProcessingQueue, self).__init__()
 
         self.__logger = logger
+        self.__timeout = delay
         self.__database_uri = database_uri
         self.__cond = Condition()
         self.__timer = None
@@ -123,6 +124,7 @@ class ScannerProcessingQueue(Thread):
             self.__run()
         except Exception, e:
             self.__logger.critical(e)
+            raise e
 
     def __run(self):
         while self.__running:
@@ -181,7 +183,7 @@ class ScannerProcessingQueue(Thread):
 
             if self.__timer:
                 self.__timer.cancel()
-            self.__timer = Timer(5, self.__wakeup)
+            self.__timer = Timer(self.__timeout, self.__wakeup)
             self.__timer.start()
 
     def __wakeup(self):
@@ -195,7 +197,7 @@ class ScannerProcessingQueue(Thread):
                 return None
 
             next = min(self.__queue.iteritems(), key = lambda i: i[1].time)
-            if not self.__running or next[1].time + 5 <= time.time():
+            if not self.__running or next[1].time + self.__timeout <= time.time():
                 del self.__queue[next[0]]
                 return next[1]
 
@@ -204,6 +206,7 @@ class ScannerProcessingQueue(Thread):
 class SupysonicWatcher(object):
     def __init__(self, config):
         self.__config = config
+        self.__running = True
 
     def run(self):
         logger = logging.getLogger(__name__)
@@ -231,19 +234,21 @@ class SupysonicWatcher(object):
             store.close()
             return
 
-        queue = ScannerProcessingQueue(self.__config.BASE['database_uri'], logger)
+        queue = ScannerProcessingQueue(self.__config.BASE['database_uri'], self.__config.DAEMON['wait_delay'], logger)
         handler = SupysonicWatcherEventHandler(self.__config.BASE['scanner_extensions'], queue, logger)
         observer = Observer()
 
         for folder in folders:
             logger.info("Starting watcher for %s", folder.path)
             observer.schedule(handler, folder.path, recursive = True)
-
         store.close()
-        signal(SIGTERM, self.__terminate)
-        signal(SIGINT, self.__terminate)
 
-        self.__running = True
+        try:
+            signal(SIGTERM, self.__terminate)
+            signal(SIGINT, self.__terminate)
+        except:
+            logger.warning('Unable to set signal handlers')
+
         queue.start()
         observer.start()
         while self.__running: