From d1bffce0242f721a4bd3a61e88aaff6f6fa49248 Mon Sep 17 00:00:00 2001
From: Elena ``of Valhalla'' Grandi <valhalla@trueelena.org>
Date: Wed, 1 May 2019 17:59:33 +0200
Subject: Start listening for future commands on a socket.

---
 pyapd/app.py                |  3 ++-
 pyapd/ctl.py                | 40 ++++++++++++++++++++++++++++++++++++++++
 pyapd_config.yaml           |  2 ++
 tests/data/test_config.yaml |  1 +
 tests/test_ctl.py           | 18 ++++++++++++++++++
 5 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 pyapd/ctl.py
 create mode 100644 tests/test_ctl.py

diff --git a/pyapd/app.py b/pyapd/app.py
index ec8d523..39948ee 100644
--- a/pyapd/app.py
+++ b/pyapd/app.py
@@ -1,7 +1,7 @@
 import tornado.web
 from tornado.routing import URLSpec
 
-from . import stores
+from . import stores, ctl
 
 
 class RootHandler(tornado.web.RequestHandler):
@@ -25,6 +25,7 @@ class App(tornado.web.Application):
     def __init__(self, config, *args, **kw):
         self.config = config
         self.store = getattr(stores, self.config.backend).Store()
+        self.ctl = ctl.CtlServer(config)
         urls = [
             (r'/', RootHandler),
             URLSpec(r'/object/(.*)', handler=ObjectHandler),
diff --git a/pyapd/ctl.py b/pyapd/ctl.py
new file mode 100644
index 0000000..d134e08
--- /dev/null
+++ b/pyapd/ctl.py
@@ -0,0 +1,40 @@
+import errno
+import functools
+import socket
+
+import tornado.netutil
+import tornado.ioloop
+import tornado.iostream
+
+
+class CtlServer():
+    def __init__(self, config):
+        self.config = config
+        self.ctl_socket = tornado.netutil.bind_unix_socket(
+            self.config.ctl_socket,
+            )
+        io_loop = tornado.ioloop.IOLoop.current()
+        io_loop.add_handler(
+            self.ctl_socket.fileno(),
+            functools.partial(self.connection_ready, self.ctl_socket),
+            io_loop.READ,
+            )
+
+    def connection_ready(self, sock, fd, events):
+        try:
+            connection, address = sock.accept()
+        except socket.error as e:
+            if e.args[0] not in (errno.EWOULDBLOCK, errno.EAGAIN):
+                raise
+            return
+        connection.setblocking(0)
+        io_loop = tornado.ioloop.IOLoop.current()
+        io_loop.spawn_callback(self.handle_connection, connection, address)
+
+    async def handle_connection(self, conn, addr):
+        stream = tornado.iostream.IOStream(conn)
+        message = await stream.read_until_close()
+        await self.get_command(message)
+
+    async def get_command(self, message):
+        print("got command: ", message)
diff --git a/pyapd_config.yaml b/pyapd_config.yaml
index 4a485ff..dbfca28 100644
--- a/pyapd_config.yaml
+++ b/pyapd_config.yaml
@@ -1 +1,3 @@
 backend: memory
+#ctl_socket: /var/run/pyapd.sock
+ctl_socket: ./pyapd.sock
diff --git a/tests/data/test_config.yaml b/tests/data/test_config.yaml
index 4a485ff..c85a935 100644
--- a/tests/data/test_config.yaml
+++ b/tests/data/test_config.yaml
@@ -1 +1,2 @@
 backend: memory
+ctl_socket: tempfile
diff --git a/tests/test_ctl.py b/tests/test_ctl.py
new file mode 100644
index 0000000..404a430
--- /dev/null
+++ b/tests/test_ctl.py
@@ -0,0 +1,18 @@
+import os
+import tempfile
+
+from tornado.testing import AsyncTestCase
+
+from pyapd import ctl, config
+
+
+class TestCtlServer(AsyncTestCase):
+    def setUp(self):
+        super().setUp()
+        self.tempdir = tempfile.TemporaryDirectory()
+        conf = config.Config('tests/data/test_config.yaml')
+        conf.ctl_socket = os.path.join(self.tempdir.name, 'pyapd.sock')
+        self.ctl_server = ctl.CtlServer(conf)
+
+    def test_nothing(self):
+        pass
-- 
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