[bitbake-devel,v3,02/22] hashserv: Add websocket connection implementation

diff --git a/lib/bb/asyncrpc/client.py b/lib/bb/asyncrpc/client.py
index 7f33099b..802c07df 100644
--- a/lib/bb/asyncrpc/client.py
+++ b/lib/bb/asyncrpc/client.py
@@ -10,7 +10,7 @@  import json
 import os
 import socket
 import sys
-from .connection import StreamConnection, DEFAULT_MAX_CHUNK
+from .connection import StreamConnection, WebsocketConnection, DEFAULT_MAX_CHUNK
 from .exceptions import ConnectionClosedError
 
 
@@ -47,6 +47,15 @@  class AsyncClient(object):
 
         self._connect_sock = connect_sock
 
+    async def connect_websocket(self, uri):
+        import websockets
+
+        async def connect_sock():
+            websocket = await websockets.connect(uri, ping_interval=None)
+            return WebsocketConnection(websocket, self.timeout)
+
+        self._connect_sock = connect_sock
+
     async def setup_connection(self):
         # Send headers
         await self.socket.send("%s %s" % (self.proto_name, self.proto_version))
diff --git a/lib/bb/asyncrpc/connection.py b/lib/bb/asyncrpc/connection.py
index c4fd2475..a10628f7 100644
--- a/lib/bb/asyncrpc/connection.py
+++ b/lib/bb/asyncrpc/connection.py
@@ -93,3 +93,47 @@  class StreamConnection(object):
         if self.writer is not None:
             self.writer.close()
             self.writer = None
+
+
+class WebsocketConnection(object):
+    def __init__(self, socket, timeout):
+        self.socket = socket
+        self.timeout = timeout
+
+    @property
+    def address(self):
+        return ":".join(str(s) for s in self.socket.remote_address)
+
+    async def send_message(self, msg):
+        await self.send(json.dumps(msg))
+
+    async def recv_message(self):
+        m = await self.recv()
+        return json.loads(m)
+
+    async def send(self, msg):
+        import websockets.exceptions
+
+        try:
+            await self.socket.send(msg)
+        except websockets.exceptions.ConnectionClosed:
+            raise ConnectionClosedError("Connection closed")
+
+    async def recv(self):
+        import websockets.exceptions
+
+        try:
+            if self.timeout < 0:
+                return await self.socket.recv()
+
+            try:
+                return await asyncio.wait_for(self.socket.recv(), self.timeout)
+            except asyncio.TimeoutError:
+                raise ConnectionError("Timed out waiting for data")
+        except websockets.exceptions.ConnectionClosed:
+            raise ConnectionClosedError("Connection closed")
+
+    async def close(self):
+        if self.socket is not None:
+            await self.socket.close()
+            self.socket = None
diff --git a/lib/bb/asyncrpc/serv.py b/lib/bb/asyncrpc/serv.py
index 8d4da1e2..3040ac91 100644
--- a/lib/bb/asyncrpc/serv.py
+++ b/lib/bb/asyncrpc/serv.py
@@ -12,7 +12,7 @@  import signal
 import socket
 import sys
 import multiprocessing
-from .connection import StreamConnection
+from .connection import StreamConnection, WebsocketConnection
 from .exceptions import ClientError, ServerError, ConnectionClosedError
 
 
@@ -172,6 +172,54 @@  class UnixStreamServer(StreamServer):
         os.unlink(self.path)
 
 
+class WebsocketsServer(object):
+    def __init__(self, host, port, handler, logger):
+        self.host = host
+        self.port = port
+        self.handler = handler
+        self.logger = logger
+
+    def start(self, loop):
+        import websockets.server
+
+        self.server = loop.run_until_complete(
+            websockets.server.serve(
+                self.client_handler,
+                self.host,
+                self.port,
+                ping_interval=None,
+            )
+        )
+
+        for s in self.server.sockets:
+            self.logger.debug("Listening on %r" % (s.getsockname(),))
+
+            # Enable keep alives. This prevents broken client connections
+            # from persisting on the server for long periods of time.
+            s.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
+            s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 30)
+            s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 15)
+            s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 4)
+
+        name = self.server.sockets[0].getsockname()
+        if self.server.sockets[0].family == socket.AF_INET6:
+            self.address = "ws://[%s]:%d" % (name[0], name[1])
+        else:
+            self.address = "ws://%s:%d" % (name[0], name[1])
+
+        return [self.server.wait_closed()]
+
+    async def stop(self):
+        self.server.close()
+
+    def cleanup(self):
+        pass
+
+    async def client_handler(self, websocket):
+        socket = WebsocketConnection(websocket, -1)
+        await self.handler(socket)
+
+
 class AsyncServer(object):
     def __init__(self, logger):
         self.logger = logger
@@ -184,6 +232,9 @@  class AsyncServer(object):
     def start_unix_server(self, path):
         self.server = UnixStreamServer(path, self._client_handler, self.logger)
 
+    def start_websocket_server(self, host, port):
+        self.server = WebsocketsServer(host, port, self._client_handler, self.logger)
+
     async def _client_handler(self, socket):
         try:
             client = self.accept_client(socket)
diff --git a/lib/hashserv/__init__.py b/lib/hashserv/__init__.py
index 3a401835..56b9c6bc 100644
--- a/lib/hashserv/__init__.py
+++ b/lib/hashserv/__init__.py
@@ -9,11 +9,15 @@  import re
 import sqlite3
 import itertools
 import json
+from urllib.parse import urlparse
 
 UNIX_PREFIX = "unix://"
+WS_PREFIX = "ws://"
+WSS_PREFIX = "wss://"
 
 ADDR_TYPE_UNIX = 0
 ADDR_TYPE_TCP = 1
+ADDR_TYPE_WS = 2
 
 UNIHASH_TABLE_DEFINITION = (
     ("method", "TEXT NOT NULL", "UNIQUE"),
@@ -84,6 +88,8 @@  def setup_database(database, sync=True):
 def parse_address(addr):
     if addr.startswith(UNIX_PREFIX):
         return (ADDR_TYPE_UNIX, (addr[len(UNIX_PREFIX):],))
+    elif addr.startswith(WS_PREFIX) or addr.startswith(WSS_PREFIX):
+        return (ADDR_TYPE_WS, (addr,))
     else:
         m = re.match(r'\[(?P<host>[^\]]*)\]:(?P<port>\d+)$', addr)
         if m is not None:
@@ -103,6 +109,9 @@  def create_server(addr, dbname, *, sync=True, upstream=None, read_only=False):
     (typ, a) = parse_address(addr)
     if typ == ADDR_TYPE_UNIX:
         s.start_unix_server(*a)
+    elif typ == ADDR_TYPE_WS:
+        url = urlparse(a[0])
+        s.start_websocket_server(url.hostname, url.port)
     else:
         s.start_tcp_server(*a)
 
@@ -116,6 +125,8 @@  def create_client(addr):
     (typ, a) = parse_address(addr)
     if typ == ADDR_TYPE_UNIX:
         c.connect_unix(*a)
+    elif typ == ADDR_TYPE_WS:
+        c.connect_websocket(*a)
     else:
         c.connect_tcp(*a)
 
@@ -128,6 +139,8 @@  async def create_async_client(addr):
     (typ, a) = parse_address(addr)
     if typ == ADDR_TYPE_UNIX:
         await c.connect_unix(*a)
+    elif typ == ADDR_TYPE_WS:
+        await c.connect_websocket(*a)
     else:
         await c.connect_tcp(*a)
 
diff --git a/lib/hashserv/client.py b/lib/hashserv/client.py
index b3eabda6..61c72cc9 100644
--- a/lib/hashserv/client.py
+++ b/lib/hashserv/client.py
@@ -119,6 +119,7 @@  class Client(bb.asyncrpc.Client):
         super().__init__()
         self._add_methods(
             "connect_tcp",
+            "connect_websocket",
             "get_unihash",
             "report_unihash",
             "report_unihash_equiv",
diff --git a/lib/hashserv/tests.py b/lib/hashserv/tests.py
index f343c586..01ffd52c 100644
--- a/lib/hashserv/tests.py
+++ b/lib/hashserv/tests.py
@@ -483,3 +483,20 @@  class TestHashEquivalenceTCPServer(HashEquivalenceTestSetup, HashEquivalenceComm
         # If IPv6 is enabled, it should be safe to use localhost directly, in general
         # case it is more reliable to resolve the IP address explicitly.
         return socket.gethostbyname("localhost") + ":0"
+
+
+class TestHashEquivalenceWebsocketServer(HashEquivalenceTestSetup, HashEquivalenceCommonTests, unittest.TestCase):
+    def setUp(self):
+        try:
+            import websockets
+        except ImportError as e:
+            self.skipTest(str(e))
+
+        super().setUp()
+
+    def get_server_addr(self, server_idx):
+        # Some hosts cause asyncio module to misbehave, when IPv6 is not enabled.
+        # If IPv6 is enabled, it should be safe to use localhost directly, in general
+        # case it is more reliable to resolve the IP address explicitly.
+        host = socket.gethostbyname("localhost")
+        return "ws://%s:0" % host