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giambio
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Formatted code following black style

This commit is contained in:
nocturn9x 2020-07-13 22:02:31 +02:00
parent 84f8ac5728
commit 3e4a87af21
8 changed files with 76 additions and 40 deletions
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10
giambio/__init__.py
View File

@ -21,5 +21,11 @@ from .exceptions import GiambioError, AlreadyJoinedError, CancelledError
from ._traps import sleep
from ._layers import Event
__all__ = ["AsyncScheduler", "GiambioError", "AlreadyJoinedError", "CancelledError", "sleep", "Event"]
__all__ = [
"AsyncScheduler",
"GiambioError",
"AlreadyJoinedError",
"CancelledError",
"sleep",
"Event",
]

72
giambio/_core.py
View File

@ -45,10 +45,14 @@ class AsyncScheduler:
self.tasks = deque() # Tasks that are ready to run
self.selector = DefaultSelector() # Selector object to perform I/O multiplexing
self.current_task = None # This will always point to the currently running coroutine (Task object)
self.joined = {} # Maps child tasks that need to be joined their respective parent task
self.clock = default_timer # Monotonic clock to keep track of elapsed time reliably
self.joined = (
{}
) # Maps child tasks that need to be joined their respective parent task
self.clock = (
default_timer # Monotonic clock to keep track of elapsed time reliably
)
self.paused = TimeQueue(self.clock) # Tasks that are asleep
self.events = {} # All Event objects
self.events = {} # All Event objects
self.event_waiting = defaultdict(list) # Coroutines waiting on event objects
self.sequence = 0
@ -59,10 +63,14 @@ class AsyncScheduler:
give execution control to the loop itself."""
while True:
if not self.selector.get_map() and not any([self.paused, self.tasks, self.event_waiting]): # If there is nothing to do, just exit
if not self.selector.get_map() and not any(
[self.paused, self.tasks, self.event_waiting]
): # If there is nothing to do, just exit
break
if not self.tasks:
if self.paused: # If there are no actively running tasks, we try to schedule the asleep ones
if (
self.paused
): # If there are no actively running tasks, we try to schedule the asleep ones
try:
self.check_sleeping()
except BaseException as error:
@ -74,25 +82,31 @@ class AsyncScheduler:
except BaseException as error:
self.current_task.exc = error
self.reschedule_parent(self.current_task)
while self.tasks: # While there are tasks to run
self.current_task = self.tasks.popleft() # Sets the currently running task
while self.tasks: # While there are tasks to run
self.current_task = (
self.tasks.popleft()
) # Sets the currently running task
try:
if self.current_task.status == "cancel": # Deferred cancellation
self.current_task.cancelled = True
self.current_task.throw(CancelledError(self.current_task))
method, *args = self.current_task.run(self.current_task._notify) # Run a single step with the calculation (and awake event-waiting tasks if any)
method, *args = self.current_task.run(
self.current_task._notify
) # Run a single step with the calculation (and awake event-waiting tasks if any)
self.current_task.status = "run"
getattr(self, method)(*args) # Sneaky method call, thanks to David Beazley for this ;)
getattr(self, method)(
*args
) # Sneaky method call, thanks to David Beazley for this ;)
if self.event_waiting:
self.check_events()
except CancelledError as cancelled:
self.tasks.remove(cancelled.args[0]) # Remove the dead task
self.tasks.remove(cancelled.args[0]) # Remove the dead task
self.tasks.append(self.current_task)
except StopIteration as e: # Coroutine ends
except StopIteration as e: # Coroutine ends
self.current_task.result = e.args[0] if e.args else None
self.current_task.finished = True
self.reschedule_parent(self.current_task)
except BaseException as error: # Coroutine raised
except BaseException as error: # Coroutine raised
self.current_task.exc = error
self.reschedule_parent(self.current_task)
@ -110,8 +124,12 @@ class AsyncScheduler:
def check_sleeping(self):
"""Checks and reschedules sleeping tasks"""
wait(max(0.0, self.paused[0][0] - self.clock())) # Sleep until the closest deadline in order not to waste CPU cycles
while self.paused[0][0] < self.clock(): # Reschedules tasks when their deadline has elapsed
wait(
max(0.0, self.paused[0][0] - self.clock())
) # Sleep until the closest deadline in order not to waste CPU cycles
while (
self.paused[0][0] < self.clock()
): # Reschedules tasks when their deadline has elapsed
self.tasks.append(self.paused.get())
if not self.paused:
break
@ -119,8 +137,12 @@ class AsyncScheduler:
def check_io(self):
"""Checks and schedules task to perform I/O"""
timeout = 0.0 if self.tasks else None # If there are no tasks ready wait indefinitely
io_ready = self.selector.select(timeout) # Get sockets that are ready and schedule their tasks
timeout = (
0.0 if self.tasks else None
) # If there are no tasks ready wait indefinitely
io_ready = self.selector.select(
timeout
) # Get sockets that are ready and schedule their tasks
for key, _ in io_ready:
self.tasks.append(key.data) # Socket ready? Schedule the task
@ -167,7 +189,7 @@ class AsyncScheduler:
self.current_task.status = "I/O"
if self.current_task._last_io:
if self.current_task._last_io == ("READ", sock):
return # Socket is already scheduled!
return # Socket is already scheduled!
else:
self.selector.unregister(sock)
busy = False
@ -185,7 +207,7 @@ class AsyncScheduler:
self.current_task.status = "I/O"
if self.current_task._last_io:
if self.current_task._last_io == ("WRITE", sock):
return # Socket is already scheduled!
return # Socket is already scheduled!
else:
self.selector.unregister(sock) # modify() causes issues
busy = False
@ -205,7 +227,7 @@ class AsyncScheduler:
if child.cancelled: # Task was cancelled and is therefore dead
self.tasks.append(self.current_task)
elif child.exc: # Task raised an error, propagate it!
elif child.exc: # Task raised an error, propagate it!
self.reschedule_parent(child)
raise child.exc
elif child.finished:
@ -214,7 +236,9 @@ class AsyncScheduler:
if child not in self.joined:
self.joined[child] = self.current_task
else:
raise AlreadyJoinedError("Joining the same task multiple times is not allowed!")
raise AlreadyJoinedError(
"Joining the same task multiple times is not allowed!"
)
def sleep(self, seconds: int or float):
"""Puts the caller to sleep for a given amount of seconds"""
@ -250,11 +274,13 @@ class AsyncScheduler:
in order to stop it from executing. The loop continues to execute as tasks
are independent"""
if task.status in ("sleep", "I/O") and not task.cancelled: # It is safe to cancel a task while blocking
if (
task.status in ("sleep", "I/O") and not task.cancelled
): # It is safe to cancel a task while blocking
task.cancelled = True
task.throw(CancelledError(task))
elif task.status == "run":
task.status = "cancel" # Cancellation is deferred
task.status = "cancel" # Cancellation is deferred
def wrap_socket(self, sock):
"""Wraps a standard socket into an AsyncSocket object"""
@ -300,4 +326,4 @@ class AsyncScheduler:
await want_write(sock)
err = sock.getsockopt(SOL_SOCKET, SO_ERROR)
if err != 0:
raise OSError(err, f'Connect call failed: {addr}')
raise OSError(err, f"Connect call failed: {addr}")

4
giambio/_layers.py
View File

@ -26,7 +26,7 @@ class Task:
def __init__(self, coroutine: types.coroutine):
self.coroutine = coroutine
self.cancelled = False # True if the task gets cancelled
self.cancelled = False # True if the task gets cancelled
self.exc = None
self.result = None
self.finished = False
@ -117,5 +117,3 @@ class TimeQueue:
def get(self):
return heappop(self.container)[2]

5
giambio/exceptions.py
View File

@ -14,8 +14,10 @@ See the License for the specific language governing permissions and
limitations under the License.
"""
class GiambioError(Exception):
"""Base class for gaimbio exceptions"""
pass
@ -33,14 +35,17 @@ class CancelledError(BaseException):
class ResourceBusy(GiambioError):
"""Exception that is raised when a resource is accessed by more than
one task at a time"""
pass
class BrokenPipeError(GiambioError):
"""Wrapper around the broken pipe socket.error"""
pass
class ResourceClosed(GiambioError):
"""Raised when I/O is attempted on a closed fd"""
pass

5
giambio/socket.py
View File

@ -21,8 +21,10 @@ limitations under the License.
import socket
from .exceptions import ResourceClosed
from ._traps import sleep
try:
from ssl import SSLWantReadError, SSLWantWriteError
WantRead = (BlockingIOError, InterruptedError, SSLWantReadError)
WantWrite = (BlockingIOError, InterruptedError, SSLWantWriteError)
except ImportError:
@ -67,7 +69,7 @@ class AsyncSocket(object):
if self._closed:
raise ResourceClosed("I/O operation on closed socket")
await sleep(0) # Give the scheduler the time to unregister the socket first
await sleep(0) # Give the scheduler the time to unregister the socket first
await self.loop.close_sock(self.sock)
self._closed = True
@ -86,4 +88,3 @@ class AsyncSocket(object):
def __repr__(self):
return f"giambio.socket.AsyncSocket({self.sock}, {self.loop})"

4
setup.py
View File

@ -16,7 +16,7 @@ setuptools.setup(
classifiers=[
"Programming Language :: Python :: 3",
"Operating System :: OS Independent",
"License :: OSI Approved :: Apache License 2.0"
"License :: OSI Approved :: Apache License 2.0",
],
python_requires='>=3.6'
python_requires=">=3.6",
)

3
tests/count.py
View File

@ -9,6 +9,7 @@ async def countdown(n: int):
print("Countdown over")
return 0
async def countup(stop: int, step: int = 1):
x = 0
while x < stop:
@ -32,7 +33,7 @@ async def main():
print(f"Countup returned: {up}\nCountdown returned: {down}")
print("Task execution complete")
if __name__ == "__main__":
scheduler = giambio.AsyncScheduler()
scheduler.start(main())

13
tests/server.py
View File

@ -5,9 +5,9 @@ import logging
sched = giambio.AsyncScheduler()
logging.basicConfig(level=20,
format="[%(levelname)s] %(asctime)s %(message)s",
datefmt='%d/%m/%Y %p')
logging.basicConfig(
level=20, format="[%(levelname)s] %(asctime)s %(message)s", datefmt="%d/%m/%Y %p"
)
async def server(address: tuple):
@ -31,7 +31,7 @@ async def echo_handler(sock: AsyncSocket, addr: tuple):
if not data:
break
to_send_back = data
data = data.decode("utf-8").encode('unicode_escape')
data = data.decode("utf-8").encode("unicode_escape")
logging.info(f"Got: '{data.decode('utf-8')}' from {addr}")
await sock.send_all(b"Got: " + to_send_back)
logging.info(f"Echoed back '{data.decode('utf-8')}' to {addr}")
@ -40,7 +40,6 @@ async def echo_handler(sock: AsyncSocket, addr: tuple):
if __name__ == "__main__":
try:
sched.start(server(('', 25001)))
except KeyboardInterrupt: # Exceptions propagate!
sched.start(server(("", 25001)))
except KeyboardInterrupt: # Exceptions propagate!
print("Exiting...")