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from txaio._version import __version__
from txaio.interfaces import IFailedFuture, ILogger
version = __version__
# This is the API
# see tx.py for Twisted implementation
# see aio.py for asyncio implementation
class _Config(object):
"""
This holds all valid configuration options, accessed as
class-level variables. For example, if you were using asyncio:
.. sourcecode:: python
txaio.config.loop = asyncio.get_event_loop()
``loop`` is populated automatically (while importing one of the
framework-specific libraries) but can be changed before any call
into this library. Currently, it's only used by :meth:`call_later`
If using asyncio, you must set this to an event-loop (by default,
we use asyncio.get_event_loop). If using Twisted, set this to a
reactor instance (by default we "from twisted.internet import
reactor" on the first call to call_later)
"""
#: the event-loop object to use
loop = None
__all__ = (
'with_config', # allow mutliple custom configurations at once
'using_twisted', # True if we're using Twisted
'using_asyncio', # True if we're using asyncio
'use_twisted', # sets the library to use Twisted, or exception
'use_asyncio', # sets the library to use asyncio, or exception
'config', # the config instance, access via attributes
'create_future', # create a Future (can be already resolved/errored)
'create_future_success',
'create_future_error',
'create_failure', # return an object implementing IFailedFuture
'as_future', # call a method, and always return a Future
'is_future', # True for Deferreds in tx and Futures, @coroutines in asyncio
'reject', # errback a Future
'resolve', # callback a Future
'cancel', # cancel a Future
'add_callbacks', # add callback and/or errback
'gather', # return a Future waiting for several other Futures
'is_called', # True if the Future has a result
'call_later', # call the callback after the given delay seconds
'failure_message', # a printable error-message from a IFailedFuture
'failure_traceback', # returns a traceback instance from an IFailedFuture
'failure_format_traceback', # a string, the formatted traceback
'make_batched_timer', # create BatchedTimer/IBatchedTimer instances
'make_logger', # creates an object implementing ILogger
'start_logging', # initializes logging (may grab stdin at this point)
'set_global_log_level', # Set the global log level
'get_global_log_level', # Get the global log level
'add_log_categories',
'IFailedFuture', # describes API for arg to errback()s
'ILogger', # API for logging
'sleep', # little helper for inline sleeping
'time_ns', # helper: current time (UTC) in ns
'perf_counter_ns', # helper: current performance counter in ns
)
_explicit_framework = None
[docs]def use_twisted():
global _explicit_framework
if _explicit_framework is not None and _explicit_framework != 'twisted':
raise RuntimeError("Explicitly using '{}' already".format(_explicit_framework))
_explicit_framework = 'twisted'
from txaio import tx
_use_framework(tx)
import txaio
txaio.using_twisted = True
txaio.using_asyncio = False
[docs]def use_asyncio():
global _explicit_framework
if _explicit_framework is not None and _explicit_framework != 'asyncio':
raise RuntimeError("Explicitly using '{}' already".format(_explicit_framework))
_explicit_framework = 'asyncio'
from txaio import aio
_use_framework(aio)
import txaio
txaio.using_twisted = False
txaio.using_asyncio = True
def _use_framework(module):
"""
Internal helper, to set this modules methods to a specified
framework helper-methods.
"""
import txaio
for method_name in __all__:
if method_name in ['use_twisted', 'use_asyncio']:
continue
setattr(txaio, method_name, getattr(module, method_name))
# use the "un-framework", which is neither asyncio nor twisted and
# just throws an exception -- this forces you to call .use_twisted()
# or .use_asyncio() to use the library.
from txaio import _unframework # noqa
_use_framework(_unframework)