PKZveJ6V dockerctx.py""" A context manager for a docker container. """ from __future__ import division, print_function import socket from contextlib import contextmanager import uuid import logging import time import typing import docker __version__ = '2017.3.1' __all__ = ['new_container'] logger = logging.getLogger('dockerctx') @contextmanager def new_container( image_name, new_container_name=lambda: uuid.uuid4().hex, ports=None, ready_test=None): """Start a docker container, and kill+remove when done. :param new_container_name: The container name. By default, a UUID will be used. If a callable, the result must be a str. :type new_container_name: str | callable :param ports: The list of port mappings to configure on the docker container. The format is the same as that used in the `docker` package, e.g. `ports={'5432/tcp': 60011}` :type ports: typing.Dict[str, int] :param ready_test: A function to run to verify whether the container is "ready" (in some sense) before yielding the container back to the caller. An example of such a test is the `accepting_connections` function in the this module, which will try repeatedly to connect to a socket, until either successfuly, or a max timeout is reached. Use functools.partial to wrap up the args. :type ready_test: typing.Callable[[], bool] """ _ = new_container_name name = str(_() if callable(_) else _) client = docker.from_env() logger.info('New postgres container: %s', name) container = client.containers.run(image_name, name=name, detach=True, ports=ports) try: logger.info('Waiting for postgres to be ready') if ready_test and not ready_test(): raise ConnectionError( 'Container {} not ready fast enough.'.format(name) ) yield container finally: logger.info('Stopping container %s', name) # TODO: container.stop() does not seem to work here (e.g. for postgres) container.kill() logger.info(f'Removing container %s', name) container.remove() def accepting_connections(host, port, timeout=20): """Try to make a socket connection to `(host, port)` I'll try every 200 ms, and eventually give up after `timeout`. :type host: str :type port: int :type timeout: int :return: True for successful connection, False otherwise :rtype: bool """ t0 = time.time() while time.time() - t0 < timeout: try: # s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s = socket.create_connection((host, port)) logger.debug('Connected!') s.close() return True except socket.error as ex: logger.debug("Connection failed with errno %s: %s", ex.errno, ex.strerror) time.sleep(0.2) return False PK!H|&Ub"dockerctx-2017.3.1.dist-info/WHEEL HM K-*ϳR03rOK-J,/RH,Q034 /, (-JLR()*M ILR(4KM̫#DPK!Hvˡ %dockerctx-2017.3.1.dist-info/METADATAVQo6~ׯ+d6芩3 E`I%Pb#*IEݑl'yÐǻ}(GR^'oK` !߼z.9N^G]Nr>8h+4PjbTh>ZIr|$G(!%BPAGh0ud:ΠB];W#dFJ(8ta %B^kt"X}Yfy\Uz#RJgAIb풎$=Z UAEaX>mV(:S։ЙU=?B+[oةNܖem ׍< Vlxd[̉90Z%p):$oRĖ Бl"ռ #6: &sW7g΃YiejC< r~,%͘덂~92:~\wH, &3T>a2'6.N 1zK(>4 ;1t\<3[h d`n9%@cNP*yg &}РP.QnL7۱#X UR+<m=MƵ#(KE}xDa㟎snZ|Ƙ?g$5n CF4d4jt 륍妬69 ,B HG|'&DDͯSnI6"[ڱĥ֤g5=&YmTX@բR; Rٳ~>/|MG _&}%1d7mi/%HГNDKų#j"5w\E ͯ[̸kMG15XL