1 files changed, 218 insertions, 0 deletions

diff --git a/bitbake/lib/bb/asyncrpc/serv.py b/bitbake/lib/bb/asyncrpc/serv.py
new file mode 100644
index 0000000000..cb3384639d
--- /dev/null
+++ b/bitbake/lib/bb/asyncrpc/serv.py
@@ -0,0 +1,218 @@
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+
+import abc
+import asyncio
+import json
+import os
+import signal
+import socket
+import sys
+from . import chunkify, DEFAULT_MAX_CHUNK
+
+
+class ClientError(Exception):
+    pass
+
+
+class ServerError(Exception):
+    pass
+
+
+class AsyncServerConnection(object):
+    def __init__(self, reader, writer, proto_name, logger):
+        self.reader = reader
+        self.writer = writer
+        self.proto_name = proto_name
+        self.max_chunk = DEFAULT_MAX_CHUNK
+        self.handlers = {
+            'chunk-stream': self.handle_chunk,
+        }
+        self.logger = logger
+
+    async def process_requests(self):
+        try:
+            self.addr = self.writer.get_extra_info('peername')
+            self.logger.debug('Client %r connected' % (self.addr,))
+
+            # Read protocol and version
+            client_protocol = await self.reader.readline()
+            if client_protocol is None:
+                return
+
+            (client_proto_name, client_proto_version) = client_protocol.decode('utf-8').rstrip().split()
+            if client_proto_name != self.proto_name:
+                self.logger.debug('Rejecting invalid protocol %s' % (self.proto_name))
+                return
+
+            self.proto_version = tuple(int(v) for v in client_proto_version.split('.'))
+            if not self.validate_proto_version():
+                self.logger.debug('Rejecting invalid protocol version %s' % (client_proto_version))
+                return
+
+            # Read headers. Currently, no headers are implemented, so look for
+            # an empty line to signal the end of the headers
+            while True:
+                line = await self.reader.readline()
+                if line is None:
+                    return
+
+                line = line.decode('utf-8').rstrip()
+                if not line:
+                    break
+
+            # Handle messages
+            while True:
+                d = await self.read_message()
+                if d is None:
+                    break
+                await self.dispatch_message(d)
+                await self.writer.drain()
+        except ClientError as e:
+            self.logger.error(str(e))
+        finally:
+            self.writer.close()
+
+    async def dispatch_message(self, msg):
+        for k in self.handlers.keys():
+            if k in msg:
+                self.logger.debug('Handling %s' % k)
+                await self.handlers[k](msg[k])
+                return
+
+        raise ClientError("Unrecognized command %r" % msg)
+
+    def write_message(self, msg):
+        for c in chunkify(json.dumps(msg), self.max_chunk):
+            self.writer.write(c.encode('utf-8'))
+
+    async def read_message(self):
+        l = await self.reader.readline()
+        if not l:
+            return None
+
+        try:
+            message = l.decode('utf-8')
+
+            if not message.endswith('\n'):
+                return None
+
+            return json.loads(message)
+        except (json.JSONDecodeError, UnicodeDecodeError) as e:
+            self.logger.error('Bad message from client: %r' % message)
+            raise e
+
+    async def handle_chunk(self, request):
+        lines = []
+        try:
+            while True:
+                l = await self.reader.readline()
+                l = l.rstrip(b"\n").decode("utf-8")
+                if not l:
+                    break
+                lines.append(l)
+
+            msg = json.loads(''.join(lines))
+        except (json.JSONDecodeError, UnicodeDecodeError) as e:
+            self.logger.error('Bad message from client: %r' % lines)
+            raise e
+
+        if 'chunk-stream' in msg:
+            raise ClientError("Nested chunks are not allowed")
+
+        await self.dispatch_message(msg)
+
+
+class AsyncServer(object):
+    def __init__(self, logger, loop=None):
+        if loop is None:
+            self.loop = asyncio.new_event_loop()
+            self.close_loop = True
+        else:
+            self.loop = loop
+            self.close_loop = False
+
+        self._cleanup_socket = None
+        self.logger = logger
+
+    def start_tcp_server(self, host, port):
+        self.server = self.loop.run_until_complete(
+            asyncio.start_server(self.handle_client, host, port, loop=self.loop)
+        )
+
+        for s in self.server.sockets:
+            self.logger.info('Listening on %r' % (s.getsockname(),))
+            # Newer python does this automatically. Do it manually here for
+            # maximum compatibility
+            s.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
+            s.setsockopt(socket.SOL_TCP, socket.TCP_QUICKACK, 1)
+
+        name = self.server.sockets[0].getsockname()
+        if self.server.sockets[0].family == socket.AF_INET6:
+            self.address = "[%s]:%d" % (name[0], name[1])
+        else:
+            self.address = "%s:%d" % (name[0], name[1])
+
+    def start_unix_server(self, path):
+        def cleanup():
+            os.unlink(path)
+
+        cwd = os.getcwd()
+        try:
+            # Work around path length limits in AF_UNIX
+            os.chdir(os.path.dirname(path))
+            self.server = self.loop.run_until_complete(
+                asyncio.start_unix_server(self.handle_client, os.path.basename(path), loop=self.loop)
+            )
+        finally:
+            os.chdir(cwd)
+
+        self.logger.info('Listening on %r' % path)
+
+        self._cleanup_socket = cleanup
+        self.address = "unix://%s" % os.path.abspath(path)
+
+    @abc.abstractmethod
+    def accept_client(self, reader, writer):
+        pass
+
+    async def handle_client(self, reader, writer):
+        # writer.transport.set_write_buffer_limits(0)
+        try:
+            client = self.accept_client(reader, writer)
+            await client.process_requests()
+        except Exception as e:
+            import traceback
+            self.logger.error('Error from client: %s' % str(e), exc_info=True)
+            traceback.print_exc()
+            writer.close()
+        self.logger.info('Client disconnected')
+
+    def run_loop_forever(self):
+        try:
+            self.loop.run_forever()
+        except KeyboardInterrupt:
+            pass
+
+    def signal_handler(self):
+        self.loop.stop()
+
+    def serve_forever(self):
+        asyncio.set_event_loop(self.loop)
+        try:
+            self.loop.add_signal_handler(signal.SIGTERM, self.signal_handler)
+
+            self.run_loop_forever()
+            self.server.close()
+
+            self.loop.run_until_complete(self.server.wait_closed())
+            self.logger.info('Server shutting down')
+        finally:
+            if self.close_loop:
+                if sys.version_info >= (3, 6):
+                    self.loop.run_until_complete(self.loop.shutdown_asyncgens())
+                self.loop.close()
+
+            if self._cleanup_socket is not None:
+                self._cleanup_socket()