Plain asio API

[python-musicpdaio.git] / musicpdasio.py

diff --git a/musicpdasio.py b/musicpdasio.py
index b52a3e3de301a32bb423b40e9790673769a39656..8bd1ba447ed96c2ed6dee96d1603437a9fec9c1b 100644 (file)
--- a/musicpdasio.py
+++ b/musicpdasio.py
@@ -19,9 +19,15 @@
 try:
     import asyncio
 except ImportError:
+    import sys
     print('Failed to import asyncio, need python >= 3.4')
+    sys.exit(1)
 
-import sys
+import logging
+
+from os import environ
+if 'DEBUG' in environ or 'PYTHONASYNCIODEBUG' in environ:
+    logging.basicConfig(level=logging.DEBUG)
 
 HELLO_PREFIX = "OK MPD "
 ERROR_PREFIX = "ACK "
@@ -56,16 +62,15 @@ class Response:
     def __init__(self):
         self.version = None
         self.resp = ''
-        self.err = None
 
     def __repr__(self):
-        return 'err:{0}, "{1}…" ({2})'.format(
-                self.err,
+        return '"{0}…" ({1})'.format(
                 ' '.join(self.resp.split('\n')[:2]),
                 self.version)
 
 class MPDProto(asyncio.Protocol):
-    def __init__(self, future, payload):
+    def __init__(self, future, payload, cred):
+        self.transport = None
         self.future = future
         self.payload = payload
         self.sess = Response()
@@ -74,42 +79,50 @@ class MPDProto(asyncio.Protocol):
         self.transport = transport
         self.transport.write(bytes('{}\n'.format(self.payload), 'utf-8'))
 
-    def data_received(self, data):
-        rcv = data.decode('utf-8')
-        if '\n' not in rcv:
-            self.sess.err = ConnectionError('Connection lost while reading line')
-            self.future.set_result(self.sess)
-            raise ConnectionError('Connection lost while reading line')
-
-        rcv = rcv.strip('\n')
-
-        if rcv.startswith(HELLO_PREFIX):
-            self.sess.version = rcv[len(HELLO_PREFIX):]
-            return
+    def eof_received(self):
         self.transport.close()
+        err = ConnectionError('Connection lost while reading line')
+        self.future.set_exception(err)
+
+    def data_received(self, data):
+        #logging.debug(data.decode('utf-8'))
+        rcv = self._hello(data.decode('utf-8'))
 
-        # set the result on the Future so that the coroutine can
-        # resume
         if rcv.startswith(ERROR_PREFIX):
-            self.sess.err = rcv[len(ERROR_PREFIX):].strip()
-            self.future.set_result(self.sess)
-            return
-        else:
-            self.sess.resp = rcv
+            err = rcv[len(ERROR_PREFIX):].strip()
+            self.future.set_exception(CommandError(err))
+
+        self.sess.resp += rcv
+        if rcv.endswith(SUCCESS+'\n'):
+            logging.debug('set future result')
+            self.transport.close()
             self.future.set_result(self.sess)
 
+    def _hello(self, rcv):
+        """Consume HELLO_PREFIX"""
+        if rcv.startswith(HELLO_PREFIX):
+            logging.debug('consumed hello prefix')
+            self.sess.version = rcv.split('\n')[0][len(HELLO_PREFIX):]
+            return rcv[rcv.find('\n')+1:]
+        return rcv
+
 class MPDClient:
-    loop = asyncio.get_event_loop()
 
-    def __init__(self, host='localhost', port=6600):
+    def __init__(self, host='localhost', port=6600, cred=None):
+        self.eloop = asyncio.get_event_loop()
+        self.asio = False
+        self.futures = []
         self._host = host
         self._port = port
+        self._cred = cred
         self._commands = {
                 'currentsong',
                 'stats',
+                'playlistinfo',
         }
 
     def __getattr__(self, attr):
+        #logging.debug(attr)
         command = attr
         wrapper = self._command
         if command not in self._commands:
@@ -119,16 +132,37 @@ class MPDClient:
                                      (self.__class__.__name__, attr))
         return lambda *args: wrapper(command, args)
 
+    @asyncio.coroutine
+    def _connect(self, proto):
+        # coroutine allowing Exception handling
+        # src: http://comments.gmane.org/gmane.comp.python.tulip/1401
+        try:
+            yield from self.eloop.create_connection(lambda: proto,
+                    host=self._host,
+                    port=self._port)
+        except Exception as err:
+            proto.future.set_exception(ConnectionError(err))
+
     def _command(self, command, args):
-        # TODO: deal with encoding
-        payload = '{} {}'.format(command ,''.join(args))
+        payload = '{} {}'.format(command, ''.join(args))
         future = asyncio.Future()
-        # kick off a task to create the connection to MPD.
-        asyncio.async(MPDClient.loop.create_connection(
-                                    lambda: MPDProto(future, payload),
-                                    host=self._host,
-                                    port=self._port))
-        MPDClient.loop.run_until_complete(future)
-        # return the future once completed.
-        return future.result()
-
+        # kick off a task to create the connection to MPD
+        coro = self._connect(MPDProto(future, payload, self._cred))
+        asyncio.async(coro)
+        self.futures.append(future)
+        if not self.asio:
+            # return once completed.
+            self.eloop.run_until_complete(future)
+        return future
+        # alternative w/ callback
+        #if not self.asio:
+        #    future.add_done_callback(lambda ftr: MPDClient.loop.stop())
+        #    self.eloop.run_forever()
+        #return future
+
+    def run(self):
+        if self.futures:
+           self.eloop.run_until_complete(asyncio.gather(*self.futures))
+           self.futures = []
+        else:
+            logging.info('No task found in queue, need to set self.asio?')