4 files changed, 139 insertions, 0 deletions
diff --git a/src/home/relay/__init__.py b/src/home/relay/__init__.py
new file mode 100644
index 0000000..f1568be
--- /dev/null
+++ b/src/home/relay/__init__.py
@@ -0,0 +1,16 @@
+import importlib
+
+__all__ = ['RelayClient', 'RelayServer']
+
+
+def __getattr__(name):
+    _map = {
+        'RelayClient': '.client',
+        'RelayServer': '.server'
+    }
+
+    if name in __all__:
+        module = importlib.import_module(_map[name], __name__)
+        return getattr(module, name)
+
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
diff --git a/src/home/relay/__init__.pyi b/src/home/relay/__init__.pyi
new file mode 100644
index 0000000..94341f6
--- /dev/null
+++ b/src/home/relay/__init__.pyi
@@ -0,0 +1,2 @@
+from .client import RelayClient as RelayClient
+from .server import RelayServer as RelayServer
diff --git a/src/home/relay/client.py b/src/home/relay/client.py
new file mode 100644
index 0000000..8c8d6c4
--- /dev/null
+++ b/src/home/relay/client.py
@@ -0,0 +1,39 @@
+import socket
+
+
+class RelayClient:
+    def __init__(self, port=8307, host='127.0.0.1'):
+        self._host = host
+        self._port = port
+        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+
+    def __del__(self):
+        self.sock.close()
+
+    def connect(self):
+        self.sock.connect((self._host, self._port))
+
+    def _write(self, line):
+        self.sock.sendall((line+'\r\n').encode())
+
+    def _read(self):
+        buf = bytearray()
+        while True:
+            buf.extend(self.sock.recv(256))
+            if b'\r\n' in buf:
+                break
+
+        response = buf.decode().strip()
+        return response
+
+    def on(self):
+        self._write('on')
+        return self._read()
+
+    def off(self):
+        self._write('off')
+        return self._read()
+
+    def status(self):
+        self._write('get')
+        return self._read()
diff --git a/src/home/relay/server.py b/src/home/relay/server.py
new file mode 100644
index 0000000..1f33969
--- /dev/null
+++ b/src/home/relay/server.py
@@ -0,0 +1,82 @@
+import asyncio
+import logging
+
+from pyA20.gpio import gpio
+from pyA20.gpio import port as gpioport
+from ..util import Addr
+
+logger = logging.getLogger(__name__)
+
+
+class RelayServer:
+    OFF = 1
+    ON = 0
+
+    def __init__(self,
+                 pinname: str,
+                 addr: Addr):
+        if not hasattr(gpioport, pinname):
+            raise ValueError(f'invalid pin {pinname}')
+
+        self.pin = getattr(gpioport, pinname)
+        self.addr = addr
+
+        gpio.init()
+        gpio.setcfg(self.pin, gpio.OUTPUT)
+
+        self.lock = asyncio.Lock()
+
+    def run(self):
+        asyncio.run(self.run_server())
+
+    async def relay_set(self, value):
+        async with self.lock:
+            gpio.output(self.pin, value)
+
+    async def relay_get(self):
+        async with self.lock:
+            return int(gpio.input(self.pin)) == RelayServer.ON
+
+    async def handle_client(self, reader, writer):
+        request = None
+        while request != 'quit':
+            try:
+                request = await reader.read(255)
+                if request == b'\x04':
+                    break
+                request = request.decode('utf-8').strip()
+            except Exception:
+                break
+
+            data = 'unknown'
+            if request == 'on':
+                await self.relay_set(RelayServer.ON)
+                logger.debug('set on')
+                data = 'ok'
+
+            elif request == 'off':
+                await self.relay_set(RelayServer.OFF)
+                logger.debug('set off')
+                data = 'ok'
+
+            elif request == 'get':
+                status = await self.relay_get()
+                data = 'on' if status is True else 'off'
+
+            writer.write((data + '\r\n').encode('utf-8'))
+            try:
+                await writer.drain()
+            except ConnectionError:
+                break
+
+        try:
+            writer.close()
+        except ConnectionError:
+            pass
+
+    async def run_server(self):
+        host, port = self.addr
+        server = await asyncio.start_server(self.handle_client, host, port)
+        async with server:
+            logger.info('Server started.')
+            await server.serve_forever()