mirror of https://github.com/nocturn9x/giambio.git
Initial broken work on a generic streams interface
This commit is contained in:
parent
55868c450e
commit
e37ffdeb06
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@ -16,6 +16,10 @@ rock-solid and structured concurrency framework (I personally recommend trio and
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that most of the content of this document is ~~stolen~~ inspired from its documentation)
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# Disclaimer #2
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This is a toy project. Don't try to use it in production, it *will* explode
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## Goals of this project
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Making yet another async library might sound dumb in an already fragmented ecosystem like Python's.
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@ -15,7 +15,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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import functools
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# Import libraries and internal resources
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from numbers import Number
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from giambio.task import Task
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@ -33,6 +33,7 @@ from giambio.exceptions import (
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ResourceBusy,
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GiambioError,
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TooSlowError,
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ResourceClosed
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)
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@ -433,12 +434,15 @@ class AsyncScheduler:
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task.result = ret.value
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task.finished = True
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self.join(task)
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self.tasks.remove(task)
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except CancelledError as cancel:
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task.status = "cancelled"
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task.cancel_pending = False
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task.cancelled = True
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self.join(task)
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except BaseException as err:
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task.exc = err
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self.join(task)
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if task in self.tasks:
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self.tasks.remove(task)
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def prune_deadlines(self):
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"""
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@ -666,6 +670,8 @@ class AsyncScheduler:
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self.io_release_task(task)
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if task in self.suspended:
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self.suspended.remove(task)
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if task in self.tasks:
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self.tasks.remove(task)
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# If the pool (including any enclosing pools) has finished executing
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# or we're at the first task that kicked the loop, we can safely
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# reschedule the parent(s)
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@ -770,13 +776,25 @@ class AsyncScheduler:
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task.cancelled = True
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task.status = "cancelled"
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self.debugger.after_cancel(task)
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self.tasks.remove(task)
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self.join(task)
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else:
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# If the task ignores our exception, we'll
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# raise it later again
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task.cancel_pending = True
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def notify_closing(self, stream):
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"""
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Implements the notify_closing trap
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"""
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if self.selector.get_map():
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for k in filter(
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lambda o: o.data == self.current_task,
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dict(self.selector.get_map()).values(),
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):
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self.handle_task_exit(k.data,
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functools.partial(k.data.throw(ResourceClosed("stream has been closed"))))
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def register_sock(self, sock, evt_type: str):
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"""
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Registers the given socket inside the
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@ -37,7 +37,7 @@ class InternalError(GiambioError):
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...
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class CancelledError(GiambioError):
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class CancelledError(BaseException):
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"""
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Exception raised by the giambio.objects.Task.cancel() method
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to terminate a child task. This should NOT be caught, or
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246
giambio/io.py
246
giambio/io.py
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@ -15,14 +15,16 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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import socket
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import warnings
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import os
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import giambio
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from giambio.exceptions import ResourceClosed
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from giambio.traps import want_write, want_read, io_release
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from giambio.traps import want_write, want_read, io_release, notify_closing
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try:
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from ssl import SSLWantReadError, SSLWantWriteError
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from ssl import SSLWantReadError, SSLWantWriteError, SSLSocket
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WantRead = (BlockingIOError, InterruptedError, SSLWantReadError)
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WantWrite = (BlockingIOError, InterruptedError, SSLWantWriteError)
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@ -31,16 +33,115 @@ except ImportError:
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WantWrite = (BlockingIOError, InterruptedError)
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class AsyncSocket:
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class AsyncStream:
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"""
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A generic asynchronous stream over
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a file descriptor. Only works on Linux
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& co because windows doesn't like select()
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to be called on non-socket objects
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(Thanks, Microsoft)
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"""
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def __init__(self, fd: int, open_fd: bool = True, close_on_context_exit: bool = True, **kwargs):
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self._fd = fd
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self.stream = None
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if open_fd:
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self.stream = os.fdopen(self._fd, **kwargs)
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os.set_blocking(self._fd, False)
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self.close_on_context_exit = close_on_context_exit
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async def read(self, size: int = -1):
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"""
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Reads up to size bytes from the
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given stream. If size == -1, read
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until EOF is reached
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"""
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while True:
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try:
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return self.stream.read(size)
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except WantRead:
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await want_read(self.stream)
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async def write(self, data):
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"""
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Writes data b to the file.
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Returns the number of bytes
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written
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"""
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while True:
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try:
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return self.stream.write(data)
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except WantWrite:
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await want_write(self.stream)
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async def close(self):
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"""
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Closes the stream asynchronously
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"""
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if self._fd == -1:
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raise ResourceClosed("I/O operation on closed stream")
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self._fd = -1
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await notify_closing(self.stream)
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await io_release(self.stream)
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self.stream.close()
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self.stream = None
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@property
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async def fileno(self):
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"""
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Wrapper socket method
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"""
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return self._fd
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async def __aenter__(self):
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self.stream.__enter__()
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return self
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async def __aexit__(self, *args):
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if self._fd != -1 and self.close_on_context_exit:
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await self.close()
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async def dup(self):
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"""
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Wrapper stream method
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"""
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return type(self)(os.dup(self._fd))
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def __repr__(self):
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return f"AsyncStream({self.stream})"
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def __del__(self):
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"""
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Stream destructor. Do *not* call
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this directly: stuff will break
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"""
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if self._fd != -1:
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try:
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os.set_blocking(self._fd, False)
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os.close(self._fd)
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except OSError as e:
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warnings.warn(f"An exception occurred in __del__ for stream {self} -> {type(e).__name__}: {e}")
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class AsyncSocket(AsyncStream):
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"""
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Abstraction layer for asynchronous sockets
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"""
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def __init__(self, sock, do_handshake_on_connect: bool = True):
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self.sock = sock
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def __init__(self, sock: socket.socket, close_on_context_exit: bool = True, do_handshake_on_connect: bool = True):
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super().__init__(sock.fileno(), open_fd=False, close_on_context_exit=close_on_context_exit)
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self.do_handshake_on_connect = do_handshake_on_connect
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self._fd = sock.fileno()
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self.sock.setblocking(False)
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self.stream = socket.fromfd(self._fd, sock.family, sock.type, sock.proto)
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self.stream.setblocking(False)
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# A socket that isn't connected doesn't
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# need to be closed
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self.needs_closing: bool = False
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async def receive(self, max_size: int, flags: int = 0) -> bytes:
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"""
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raise ResourceClosed("I/O operation on closed socket")
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while True:
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try:
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return self.sock.recv(max_size, flags)
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return self.stream.recv(max_size, flags)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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async def connect(self, address):
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"""
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raise ResourceClosed("I/O operation on closed socket")
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while True:
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try:
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self.sock.connect(address)
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self.stream.connect(address)
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if self.do_handshake_on_connect:
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await self.do_handshake()
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return
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break
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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self.needs_closing = True
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async def close(self):
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"""
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Wrapper socket method
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"""
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if self.needs_closing:
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await super().close()
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async def accept(self):
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"""
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raise ResourceClosed("I/O operation on closed socket")
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while True:
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try:
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remote, addr = self.sock.accept()
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remote, addr = self.stream.accept()
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return type(self)(remote), addr
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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async def send_all(self, data: bytes, flags: int = 0):
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"""
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sent_no = 0
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while data:
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try:
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sent_no = self.sock.send(data, flags)
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sent_no = self.stream.send(data, flags)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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data = data[sent_no:]
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async def close(self):
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"""
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Closes the socket asynchronously
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"""
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if self._fd == -1:
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raise ResourceClosed("I/O operation on closed socket")
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await io_release(self.sock)
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self.sock.close()
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self._fd = -1
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self.sock = None
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async def shutdown(self, how):
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"""
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Wrapper socket method
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"""
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if self.sock:
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self.sock.shutdown(how)
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if self.stream:
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self.stream.shutdown(how)
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await giambio.sleep(0) # Checkpoint
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async def bind(self, addr: tuple):
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if self._fd == -1:
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raise ResourceClosed("I/O operation on closed socket")
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self.sock.bind(addr)
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self.stream.bind(addr)
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async def listen(self, backlog: int):
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"""
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if self._fd == -1:
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raise ResourceClosed("I/O operation on closed socket")
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self.sock.listen(backlog)
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async def __aenter__(self):
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self.sock.__enter__()
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return self
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async def __aexit__(self, *args):
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if self.sock:
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self.sock.__exit__(*args)
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self.stream.listen(backlog)
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# Yes, I stole these from Curio because I could not be
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# arsed to write a bunch of uninteresting simple socket
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# methods from scratch, deal with it.
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async def fileno(self):
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"""
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Wrapper socket method
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"""
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return self._fd
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async def settimeout(self, seconds):
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"""
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Wrapper socket method
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@ -188,22 +271,23 @@ class AsyncSocket:
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Wrapper socket method
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"""
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return type(self)(self.sock.dup())
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return type(self)(self.stream.dup(), self.do_handshake_on_connect)
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async def do_handshake(self):
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"""
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Wrapper socket method
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"""
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if not hasattr(self.sock, "do_handshake"):
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if not hasattr(self.stream, "do_handshake"):
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return
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while True:
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try:
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return self.sock.do_handshake()
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self.stream: SSLSocket # Silences pycharm warnings
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return self.stream.do_handshake()
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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async def recvfrom(self, buffersize, flags=0):
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"""
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@ -212,11 +296,11 @@ class AsyncSocket:
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while True:
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try:
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return self.sock.recvfrom(buffersize, flags)
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return self.stream.recvfrom(buffersize, flags)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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async def recvfrom_into(self, buffer, bytes=0, flags=0):
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"""
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@ -225,11 +309,11 @@ class AsyncSocket:
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while True:
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try:
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return self.sock.recvfrom_into(buffer, bytes, flags)
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return self.stream.recvfrom_into(buffer, bytes, flags)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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async def sendto(self, bytes, flags_or_address, address=None):
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"""
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|
@ -243,11 +327,11 @@ class AsyncSocket:
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flags = 0
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while True:
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try:
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return self.sock.sendto(bytes, flags, address)
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return self.stream.sendto(bytes, flags, address)
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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async def getpeername(self):
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"""
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|
@ -256,11 +340,11 @@ class AsyncSocket:
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while True:
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try:
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return self.sock.getpeername()
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return self.stream.getpeername()
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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async def getsockname(self):
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"""
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|
@ -269,11 +353,11 @@ class AsyncSocket:
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while True:
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try:
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return self.sock.getpeername()
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return self.stream.getpeername()
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except WantWrite:
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await want_write(self.sock)
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await want_write(self.stream)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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async def recvmsg(self, bufsize, ancbufsize=0, flags=0):
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"""
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|
@ -282,9 +366,9 @@ class AsyncSocket:
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while True:
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try:
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return self.sock.recvmsg(bufsize, ancbufsize, flags)
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return self.stream.recvmsg(bufsize, ancbufsize, flags)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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async def recvmsg_into(self, buffers, ancbufsize=0, flags=0):
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"""
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|
@ -293,9 +377,9 @@ class AsyncSocket:
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while True:
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try:
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return self.sock.recvmsg_into(buffers, ancbufsize, flags)
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return self.stream.recvmsg_into(buffers, ancbufsize, flags)
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except WantRead:
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await want_read(self.sock)
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await want_read(self.stream)
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async def sendmsg(self, buffers, ancdata=(), flags=0, address=None):
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"""
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|
@ -304,17 +388,13 @@ class AsyncSocket:
|
|||
|
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while True:
|
||||
try:
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return self.sock.sendmsg(buffers, ancdata, flags, address)
|
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return self.stream.sendmsg(buffers, ancdata, flags, address)
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except WantRead:
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await want_write(self.sock)
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await want_write(self.stream)
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def __repr__(self):
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return f"AsyncSocket({self.sock})"
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return f"AsyncSocket({self.stream})"
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||||
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||||
def __del__(self):
|
||||
"""
|
||||
Socket destructor
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||||
"""
|
||||
|
||||
if not self._fd != -1:
|
||||
warnings.warn(f"socket '{self}' was destroyed, but was not closed, leading to a potential resource leak")
|
||||
if self.needs_closing:
|
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super().__del__()
|
||||
|
|
|
@ -178,6 +178,19 @@ async def want_write(stream):
|
|||
await create_trap("register_sock", stream, "write")
|
||||
|
||||
|
||||
async def notify_closing(stream):
|
||||
"""
|
||||
Notifies the event loop that a given
|
||||
stream needs to be closed. This makes
|
||||
all callers waiting on want_read or
|
||||
want_write crash with a ResourceClosed
|
||||
exception, but it doesn't actually close
|
||||
the socket object itself
|
||||
"""
|
||||
|
||||
await create_trap("notify_closing", stream)
|
||||
|
||||
|
||||
async def schedule_tasks(tasks: Iterable[Task]):
|
||||
"""
|
||||
Schedules a list of tasks for execution. Usuaully
|
||||
|
|
|
@ -1,44 +1,49 @@
|
|||
import sys
|
||||
from typing import Tuple
|
||||
import giambio
|
||||
import logging
|
||||
|
||||
from debugger import Debugger
|
||||
|
||||
async def sender(sock: giambio.socket.AsyncSocket, q: giambio.Queue):
|
||||
|
||||
async def reader(q: giambio.Queue, prompt: str = ""):
|
||||
in_stream = giambio.io.AsyncStream(sys.stdin.fileno(), close_on_context_exit=False, mode="r")
|
||||
out_stream = giambio.io.AsyncStream(sys.stdout.fileno(), close_on_context_exit=False, mode="w")
|
||||
while True:
|
||||
await sock.send_all(b"yo")
|
||||
await q.put((0, ""))
|
||||
await giambio.sleep(1)
|
||||
await out_stream.write(prompt)
|
||||
await q.put((0, await in_stream.read()))
|
||||
|
||||
|
||||
async def receiver(sock: giambio.socket.AsyncSocket, q: giambio.Queue):
|
||||
data = b""
|
||||
while True:
|
||||
while not data.endswith(b"\n"):
|
||||
data += await sock.receive(1024)
|
||||
temp = await sock.receive(1024)
|
||||
if not temp:
|
||||
raise EOFError("end of file")
|
||||
data += temp
|
||||
data, rest = data.split(b"\n", maxsplit=2)
|
||||
buffer = b"".join(rest)
|
||||
await q.put((1, data.decode()))
|
||||
data = buffer
|
||||
|
||||
|
||||
async def main(host: Tuple[str, int]):
|
||||
async def main(host: tuple[str, int]):
|
||||
"""
|
||||
Main client entry point
|
||||
"""
|
||||
|
||||
queue = giambio.Queue()
|
||||
out_stream = giambio.io.AsyncStream(sys.stdout.fileno(), close_on_context_exit=False, mode="w")
|
||||
async with giambio.create_pool() as pool:
|
||||
async with giambio.socket.socket() as sock:
|
||||
await sock.connect(host)
|
||||
await pool.spawn(sender, sock, queue)
|
||||
await out_stream.write("Connection successful\n")
|
||||
await pool.spawn(receiver, sock, queue)
|
||||
await pool.spawn(reader, queue, "> ")
|
||||
while True:
|
||||
op, data = await queue.get()
|
||||
if op == 0:
|
||||
print(f"Sent.")
|
||||
else:
|
||||
print(f"Received: {data}")
|
||||
if op == 1:
|
||||
await out_stream.write(data)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
|
@ -49,7 +54,7 @@ if __name__ == "__main__":
|
|||
datefmt="%d/%m/%Y %p",
|
||||
)
|
||||
try:
|
||||
giambio.run(main, ("localhost", port))
|
||||
giambio.run(main, ("localhost", port), debugger=Debugger())
|
||||
except (Exception, KeyboardInterrupt) as error: # Exceptions propagate!
|
||||
if isinstance(error, KeyboardInterrupt):
|
||||
logging.info("Ctrl+C detected, exiting")
|
||||
|
|
|
@ -1,4 +1,3 @@
|
|||
from typing import List
|
||||
import giambio
|
||||
from giambio.socket import AsyncSocket
|
||||
import logging
|
||||
|
@ -6,7 +5,8 @@ import sys
|
|||
|
||||
# An asynchronous chatroom
|
||||
|
||||
clients: List[giambio.socket.AsyncSocket] = []
|
||||
clients: dict[AsyncSocket, list[str, str]] = {}
|
||||
names: set[str] = set()
|
||||
|
||||
|
||||
async def serve(bind_address: tuple):
|
||||
|
@ -26,39 +26,52 @@ async def serve(bind_address: tuple):
|
|||
while True:
|
||||
try:
|
||||
conn, address_tuple = await sock.accept()
|
||||
clients.append(conn)
|
||||
clients[conn] = ["", f"{address_tuple[0]}:{address_tuple[1]}"]
|
||||
logging.info(f"{address_tuple[0]}:{address_tuple[1]} connected")
|
||||
await pool.spawn(handler, conn, address_tuple)
|
||||
await pool.spawn(handler, conn)
|
||||
except Exception as err:
|
||||
# Because exceptions just *work*
|
||||
logging.info(f"{address_tuple[0]}:{address_tuple[1]} has raised {type(err).__name__}: {err}")
|
||||
|
||||
|
||||
async def handler(sock: AsyncSocket, client_address: tuple):
|
||||
async def handler(sock: AsyncSocket):
|
||||
"""
|
||||
Handles a single client connection
|
||||
|
||||
:param sock: The AsyncSocket object connected to the client
|
||||
:param client_address: The client's address represented as a tuple
|
||||
(address, port) where address is a string and port is an integer
|
||||
:type client_address: tuple
|
||||
"""
|
||||
|
||||
address = f"{client_address[0]}:{client_address[1]}"
|
||||
address = clients[sock][1]
|
||||
name = ""
|
||||
async with sock: # Closes the socket automatically
|
||||
await sock.send_all(b"Welcome to the chatroom pal, start typing and press enter!\n")
|
||||
await sock.send_all(b"Welcome to the chatroom pal, may you tell me your name?\n> ")
|
||||
while True:
|
||||
while not name.endswith("\n"):
|
||||
name = (await sock.receive(64)).decode()
|
||||
name = name[:-1]
|
||||
if name not in names:
|
||||
names.add(name)
|
||||
clients[sock][0] = name
|
||||
break
|
||||
else:
|
||||
await sock.send_all(b"Sorry, but that name is already taken. Try again!\n> ")
|
||||
await sock.send_all(f"Okay {name}, welcome to the chatroom!\n".encode())
|
||||
logging.info(f"{name} has joined the chatroom ({address}), informing clients")
|
||||
for i, client_sock in enumerate(clients):
|
||||
if client_sock != sock and clients[client_sock][0]:
|
||||
await client_sock.send_all(f"{name} joins the chatroom!\n> ".encode())
|
||||
while True:
|
||||
await sock.send_all(b"> ")
|
||||
data = await sock.receive(1024)
|
||||
if not data:
|
||||
break
|
||||
elif data == b"exit\n":
|
||||
await sock.send_all(b"I'm dead dude\n")
|
||||
raise TypeError("Oh, no, I'm gonna die!")
|
||||
logging.info(f"Got: {data!r} from {address}")
|
||||
for i, client_sock in enumerate(clients):
|
||||
if client_sock != sock and clients[client_sock][0]:
|
||||
logging.info(f"Sending {data!r} to {':'.join(map(str, await client_sock.getpeername()))}")
|
||||
if client_sock != sock:
|
||||
await client_sock.send_all(data)
|
||||
if not data.endswith(b"\n"):
|
||||
data += b"\n"
|
||||
await client_sock.send_all(f"[{name}] ({address}): {data.decode()}> ".encode())
|
||||
logging.info(f"Sent {data!r} to {i} clients")
|
||||
logging.info(f"Connection from {address} closed")
|
||||
clients.remove(sock)
|
||||
|
|
|
@ -63,7 +63,7 @@ if __name__ == "__main__":
|
|||
logging.basicConfig(
|
||||
level=20,
|
||||
format="[%(levelname)s] %(asctime)s %(message)s",
|
||||
datefmt="%d/%m/%Y %p",
|
||||
datefmt="%d/%m/%Y %H:%M:%S %p",
|
||||
)
|
||||
try:
|
||||
giambio.run(serve, ("localhost", port), debugger=())
|
||||
|
|
Loading…
Reference in New Issue