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756 lines
27 KiB
Python
756 lines
27 KiB
Python
"""High level functions for working with containers."""
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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import atexit
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import contextlib
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import json
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import random
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import time
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import uuid
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from . import types as t
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from .encoding import (
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Text,
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)
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from .util import (
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ApplicationError,
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SubprocessError,
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display,
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get_host_ip,
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sanitize_host_name,
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)
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from .util_common import (
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named_temporary_file,
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)
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from .config import (
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EnvironmentConfig,
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IntegrationConfig,
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WindowsIntegrationConfig,
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)
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from .docker_util import (
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ContainerNotFoundError,
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DockerInspect,
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docker_exec,
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docker_inspect,
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docker_pull,
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docker_rm,
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docker_run,
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docker_start,
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get_docker_command,
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get_docker_container_id,
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get_docker_host_ip,
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)
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from .ansible_util import (
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run_playbook,
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)
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from .core_ci import (
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SshKey,
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)
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from .target import (
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IntegrationTarget,
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)
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from .ssh import (
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SshConnectionDetail,
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SshProcess,
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create_ssh_port_forwards,
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create_ssh_port_redirects,
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generate_ssh_inventory,
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)
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# information about support containers provisioned by the current ansible-test instance
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support_containers = {} # type: t.Dict[str, ContainerDescriptor]
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class HostType:
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"""Enum representing the types of hosts involved in running tests."""
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origin = 'origin'
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control = 'control'
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managed = 'managed'
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def run_support_container(
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args, # type: EnvironmentConfig
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context, # type: str
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image, # type: str
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name, # type: name
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ports, # type: t.List[int]
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aliases=None, # type: t.Optional[t.List[str]]
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start=True, # type: bool
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allow_existing=False, # type: bool
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cleanup=None, # type: t.Optional[bool]
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cmd=None, # type: t.Optional[t.List[str]]
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env=None, # type: t.Optional[t.Dict[str, str]]
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): # type: (...) -> ContainerDescriptor
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"""
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Start a container used to support tests, but not run them.
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Containers created this way will be accessible from tests.
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"""
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if name in support_containers:
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raise Exception('Container already defined: %s' % name)
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# SSH is required for publishing ports, as well as modifying the hosts file.
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# Initializing the SSH key here makes sure it is available for use after delegation.
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SshKey(args)
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aliases = aliases or [sanitize_host_name(name)]
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current_container_id = get_docker_container_id()
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publish_ports = True
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docker_command = get_docker_command().command
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if docker_command == 'docker':
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if args.docker:
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publish_ports = False # publishing ports is not needed when test hosts are on the docker network
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if current_container_id:
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publish_ports = False # publishing ports is pointless if already running in a docker container
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options = ['--name', name]
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if start:
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options.append('-d')
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if publish_ports:
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for port in ports:
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options.extend(['-p', str(port)])
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if env:
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for key, value in env.items():
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options.extend(['--env', '%s=%s' % (key, value)])
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support_container_id = None
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if allow_existing:
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try:
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container = docker_inspect(args, name)
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except ContainerNotFoundError:
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container = None
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if container:
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support_container_id = container.id
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if not container.running:
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display.info('Ignoring existing "%s" container which is not running.' % name, verbosity=1)
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support_container_id = None
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elif not container.image:
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display.info('Ignoring existing "%s" container which has the wrong image.' % name, verbosity=1)
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support_container_id = None
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elif publish_ports and not all(port and len(port) == 1 for port in [container.get_tcp_port(port) for port in ports]):
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display.info('Ignoring existing "%s" container which does not have the required published ports.' % name, verbosity=1)
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support_container_id = None
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if not support_container_id:
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docker_rm(args, name)
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if support_container_id:
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display.info('Using existing "%s" container.' % name)
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running = True
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existing = True
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else:
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display.info('Starting new "%s" container.' % name)
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docker_pull(args, image)
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support_container_id = docker_run(args, image, options, create_only=not start, cmd=cmd)
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running = start
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existing = False
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if cleanup is None:
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cleanup = not existing
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descriptor = ContainerDescriptor(
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image,
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context,
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name,
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support_container_id,
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ports,
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aliases,
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publish_ports,
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running,
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existing,
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cleanup,
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env,
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)
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if not support_containers:
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atexit.register(cleanup_containers, args)
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support_containers[name] = descriptor
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return descriptor
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def get_container_database(args): # type: (EnvironmentConfig) -> ContainerDatabase
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"""Return the current container database, creating it as needed, or returning the one provided on the command line through delegation."""
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if not args.containers:
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args.containers = create_container_database(args)
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elif isinstance(args.containers, (str, bytes, Text)):
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args.containers = ContainerDatabase.from_dict(json.loads(args.containers))
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display.info('>>> Container Database\n%s' % json.dumps(args.containers.to_dict(), indent=4, sort_keys=True), verbosity=3)
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return args.containers
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class ContainerAccess:
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"""Information needed for one test host to access a single container supporting tests."""
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def __init__(self, host_ip, names, ports, forwards): # type: (str, t.List[str], t.Optional[t.List[int]], t.Optional[t.Dict[int, int]]) -> None
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# if forwards is set
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# this is where forwards are sent (it is the host that provides an indirect connection to the containers on alternate ports)
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# /etc/hosts uses 127.0.0.1 (since port redirection will be used)
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# else
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# this is what goes into /etc/hosts (it is the container's direct IP)
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self.host_ip = host_ip
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# primary name + any aliases -- these go into the hosts file and reference the appropriate ip for the origin/control/managed host
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self.names = names
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# ports available (set if forwards is not set)
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self.ports = ports
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# port redirections to create through host_ip -- if not set, no port redirections will be used
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self.forwards = forwards
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def port_map(self): # type: () -> t.List[t.Tuple[int, int]]
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"""Return a port map for accessing this container."""
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if self.forwards:
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ports = list(self.forwards.items())
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else:
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ports = [(port, port) for port in self.ports]
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return ports
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@staticmethod
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def from_dict(data): # type: (t.Dict[str, t.Any]) -> ContainerAccess
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"""Return a ContainerAccess instance from the given dict."""
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forwards = data.get('forwards')
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if forwards:
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forwards = dict((int(key), value) for key, value in forwards.items())
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return ContainerAccess(
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host_ip=data['host_ip'],
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names=data['names'],
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ports=data.get('ports'),
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forwards=forwards,
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)
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def to_dict(self): # type: () -> t.Dict[str, t.Any]
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"""Return a dict of the current instance."""
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value = dict(
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host_ip=self.host_ip,
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names=self.names,
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)
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if self.ports:
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value.update(ports=self.ports)
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if self.forwards:
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value.update(forwards=self.forwards)
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return value
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class ContainerDatabase:
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"""Database of running containers used to support tests."""
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def __init__(self, data): # type: (t.Dict[str, t.Dict[str, t.Dict[str, ContainerAccess]]]) -> None
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self.data = data
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@staticmethod
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def from_dict(data): # type: (t.Dict[str, t.Any]) -> ContainerDatabase
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"""Return a ContainerDatabase instance from the given dict."""
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return ContainerDatabase(dict((access_name,
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dict((context_name,
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dict((container_name, ContainerAccess.from_dict(container))
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for container_name, container in containers.items()))
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for context_name, containers in contexts.items()))
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for access_name, contexts in data.items()))
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def to_dict(self): # type: () -> t.Dict[str, t.Any]
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"""Return a dict of the current instance."""
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return dict((access_name,
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dict((context_name,
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dict((container_name, container.to_dict())
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for container_name, container in containers.items()))
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for context_name, containers in contexts.items()))
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for access_name, contexts in self.data.items())
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def local_ssh(args): # type: (EnvironmentConfig) -> SshConnectionDetail
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"""Return SSH connection details for localhost, connecting as root to the default SSH port."""
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return SshConnectionDetail('localhost', 'localhost', None, 'root', SshKey(args).key, args.python_executable)
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def create_container_database(args): # type: (EnvironmentConfig) -> ContainerDatabase
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"""Create and return a container database with information necessary for all test hosts to make use of relevant support containers."""
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origin = {} # type: t.Dict[str, t.Dict[str, ContainerAccess]]
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control = {} # type: t.Dict[str, t.Dict[str, ContainerAccess]]
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managed = {} # type: t.Dict[str, t.Dict[str, ContainerAccess]]
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for name, container in support_containers.items():
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if container.details.published_ports:
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published_access = ContainerAccess(
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host_ip=get_docker_host_ip(),
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names=container.aliases,
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ports=None,
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forwards=dict((port, published_port) for port, published_port in container.details.published_ports.items()),
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)
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else:
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published_access = None # no published access without published ports (ports are only published if needed)
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if container.details.container_ip:
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# docker containers, and rootfull podman containers should have a container IP address
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container_access = ContainerAccess(
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host_ip=container.details.container_ip,
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names=container.aliases,
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ports=container.ports,
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forwards=None,
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)
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elif get_docker_command().command == 'podman':
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# published ports for rootless podman containers should be accessible from the host's IP
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container_access = ContainerAccess(
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host_ip=get_host_ip(),
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names=container.aliases,
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ports=None,
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forwards=dict((port, published_port) for port, published_port in container.details.published_ports.items()),
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)
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else:
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container_access = None # no container access without an IP address
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if get_docker_container_id():
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if not container_access:
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raise Exception('Missing IP address for container: %s' % name)
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origin_context = origin.setdefault(container.context, {})
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origin_context[name] = container_access
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elif not published_access:
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pass # origin does not have network access to the containers
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else:
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origin_context = origin.setdefault(container.context, {})
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origin_context[name] = published_access
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if args.remote:
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pass # SSH forwarding required
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elif args.docker or get_docker_container_id():
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if container_access:
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control_context = control.setdefault(container.context, {})
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control_context[name] = container_access
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else:
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raise Exception('Missing IP address for container: %s' % name)
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else:
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if not published_access:
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raise Exception('Missing published ports for container: %s' % name)
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control_context = control.setdefault(container.context, {})
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control_context[name] = published_access
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data = {
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HostType.origin: origin,
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HostType.control: control,
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HostType.managed: managed,
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}
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data = dict((key, value) for key, value in data.items() if value)
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return ContainerDatabase(data)
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class SupportContainerContext:
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"""Context object for tracking information relating to access of support containers."""
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def __init__(self, containers, process): # type: (ContainerDatabase, t.Optional[SshProcess]) -> None
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self.containers = containers
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self.process = process
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def close(self): # type: () -> None
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"""Close the process maintaining the port forwards."""
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if not self.process:
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return # forwarding not in use
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self.process.terminate()
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display.info('Waiting for the session SSH port forwarding process to terminate.', verbosity=1)
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self.process.wait()
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@contextlib.contextmanager
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def support_container_context(
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args, # type: EnvironmentConfig
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ssh, # type: t.Optional[SshConnectionDetail]
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): # type: (...) -> t.Optional[ContainerDatabase]
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"""Create a context manager for integration tests that use support containers."""
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if not isinstance(args, IntegrationConfig):
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yield None # containers are only used for integration tests
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return
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containers = get_container_database(args)
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if not containers.data:
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yield ContainerDatabase({}) # no containers are being used, return an empty database
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return
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context = create_support_container_context(args, ssh, containers)
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try:
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yield context.containers
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finally:
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context.close()
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def create_support_container_context(
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args, # type: EnvironmentConfig
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ssh, # type: t.Optional[SshConnectionDetail]
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containers, # type: ContainerDatabase
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): # type: (...) -> SupportContainerContext
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"""Context manager that provides SSH port forwards. Returns updated container metadata."""
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host_type = HostType.control
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revised = ContainerDatabase(containers.data.copy())
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source = revised.data.pop(HostType.origin, None)
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container_map = {} # type: t.Dict[t.Tuple[str, int], t.Tuple[str, str, int]]
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if host_type not in revised.data:
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if not source:
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raise Exception('Missing origin container details.')
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for context_name, context in source.items():
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for container_name, container in context.items():
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for port, access_port in container.port_map():
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container_map[(container.host_ip, access_port)] = (context_name, container_name, port)
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if not container_map:
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return SupportContainerContext(revised, None)
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if not ssh:
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raise Exception('The %s host was not pre-configured for container access and SSH forwarding is not available.' % host_type)
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forwards = list(container_map.keys())
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process = create_ssh_port_forwards(args, ssh, forwards)
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result = SupportContainerContext(revised, process)
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try:
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port_forwards = process.collect_port_forwards()
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contexts = {}
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for forward, forwarded_port in port_forwards.items():
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access_host, access_port = forward
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context_name, container_name, container_port = container_map[(access_host, access_port)]
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container = source[context_name][container_name]
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context = contexts.setdefault(context_name, {})
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forwarded_container = context.setdefault(container_name, ContainerAccess('127.0.0.1', container.names, None, {}))
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forwarded_container.forwards[container_port] = forwarded_port
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display.info('Container "%s" port %d available at %s:%d is forwarded over SSH as port %d.' % (
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container_name, container_port, access_host, access_port, forwarded_port,
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), verbosity=1)
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revised.data[host_type] = contexts
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return result
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except Exception:
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result.close()
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raise
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class ContainerDescriptor:
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"""Information about a support container."""
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def __init__(self,
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image, # type: str
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context, # type: str
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name, # type: str
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container_id, # type: str
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ports, # type: t.List[int]
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aliases, # type: t.List[str]
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publish_ports, # type: bool
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running, # type: bool
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existing, # type: bool
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cleanup, # type: bool
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env, # type: t.Optional[t.Dict[str, str]]
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): # type: (...) -> None
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self.image = image
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self.context = context
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self.name = name
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self.container_id = container_id
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self.ports = ports
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self.aliases = aliases
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self.publish_ports = publish_ports
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self.running = running
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self.existing = existing
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self.cleanup = cleanup
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self.env = env
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self.details = None # type: t.Optional[SupportContainer]
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def start(self, args): # type: (EnvironmentConfig) -> None
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"""Start the container. Used for containers which are created, but not started."""
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docker_start(args, self.name)
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def register(self, args): # type: (EnvironmentConfig) -> SupportContainer
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"""Record the container's runtime details. Must be used after the container has been started."""
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if self.details:
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raise Exception('Container already registered: %s' % self.name)
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try:
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container = docker_inspect(args, self.container_id)
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except ContainerNotFoundError:
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if not args.explain:
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raise
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# provide enough mock data to keep --explain working
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container = DockerInspect(args, dict(
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Id=self.container_id,
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NetworkSettings=dict(
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IPAddress='127.0.0.1',
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Ports=dict(('%d/tcp' % port, [dict(HostPort=random.randint(30000, 40000) if self.publish_ports else port)]) for port in self.ports),
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),
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Config=dict(
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Env=['%s=%s' % (key, value) for key, value in self.env.items()] if self.env else [],
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),
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))
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support_container_ip = container.get_ip_address()
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if self.publish_ports:
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# inspect the support container to locate the published ports
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tcp_ports = dict((port, container.get_tcp_port(port)) for port in self.ports)
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if any(not config or len(set(conf['HostPort'] for conf in config)) != 1 for config in tcp_ports.values()):
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raise ApplicationError('Unexpected `docker inspect` results for published TCP ports:\n%s' % json.dumps(tcp_ports, indent=4, sort_keys=True))
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published_ports = dict((port, int(config[0]['HostPort'])) for port, config in tcp_ports.items())
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else:
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|
published_ports = {}
|
|
|
|
self.details = SupportContainer(
|
|
container,
|
|
support_container_ip,
|
|
published_ports,
|
|
)
|
|
|
|
return self.details
|
|
|
|
|
|
class SupportContainer:
|
|
"""Information about a running support container available for use by tests."""
|
|
def __init__(self,
|
|
container, # type: DockerInspect
|
|
container_ip, # type: str
|
|
published_ports, # type: t.Dict[int, int]
|
|
): # type: (...) -> None
|
|
self.container = container
|
|
self.container_ip = container_ip
|
|
self.published_ports = published_ports
|
|
|
|
|
|
def wait_for_file(args, # type: EnvironmentConfig
|
|
container_name, # type: str
|
|
path, # type: str
|
|
sleep, # type: int
|
|
tries, # type: int
|
|
check=None, # type: t.Optional[t.Callable[[str], bool]]
|
|
): # type: (...) -> str
|
|
"""Wait for the specified file to become available in the requested container and return its contents."""
|
|
display.info('Waiting for container "%s" to provide file: %s' % (container_name, path))
|
|
|
|
for _iteration in range(1, tries):
|
|
if _iteration > 1:
|
|
time.sleep(sleep)
|
|
|
|
try:
|
|
stdout = docker_exec(args, container_name, ['dd', 'if=%s' % path], capture=True)[0]
|
|
except SubprocessError:
|
|
continue
|
|
|
|
if not check or check(stdout):
|
|
return stdout
|
|
|
|
raise ApplicationError('Timeout waiting for container "%s" to provide file: %s' % (container_name, path))
|
|
|
|
|
|
def cleanup_containers(args): # type: (EnvironmentConfig) -> None
|
|
"""Clean up containers."""
|
|
for container in support_containers.values():
|
|
if container.cleanup:
|
|
docker_rm(args, container.container_id)
|
|
else:
|
|
display.notice('Remember to run `docker rm -f %s` when finished testing.' % container.name)
|
|
|
|
|
|
def create_hosts_entries(context): # type: (t.Dict[str, ContainerAccess]) -> t.List[str]
|
|
"""Return hosts entries for the specified context."""
|
|
entries = []
|
|
unique_id = uuid.uuid4()
|
|
|
|
for container in context.values():
|
|
# forwards require port redirection through localhost
|
|
if container.forwards:
|
|
host_ip = '127.0.0.1'
|
|
else:
|
|
host_ip = container.host_ip
|
|
|
|
entries.append('%s %s # ansible-test %s' % (host_ip, ' '.join(container.names), unique_id))
|
|
|
|
return entries
|
|
|
|
|
|
def create_container_hooks(
|
|
args, # type: IntegrationConfig
|
|
managed_connections, # type: t.Optional[t.List[SshConnectionDetail]]
|
|
): # type: (...) -> t.Tuple[t.Optional[t.Callable[[IntegrationTarget], None]], t.Optional[t.Callable[[IntegrationTarget], None]]]
|
|
"""Return pre and post target callbacks for enabling and disabling container access for each test target."""
|
|
containers = get_container_database(args)
|
|
|
|
control_contexts = containers.data.get(HostType.control)
|
|
|
|
if control_contexts:
|
|
managed_contexts = containers.data.get(HostType.managed)
|
|
|
|
if not managed_contexts:
|
|
managed_contexts = create_managed_contexts(control_contexts)
|
|
|
|
control_type = 'posix'
|
|
|
|
if isinstance(args, WindowsIntegrationConfig):
|
|
managed_type = 'windows'
|
|
else:
|
|
managed_type = 'posix'
|
|
|
|
control_state = {}
|
|
managed_state = {}
|
|
|
|
control_connections = [local_ssh(args)]
|
|
|
|
def pre_target(target):
|
|
forward_ssh_ports(args, control_connections, '%s_hosts_prepare.yml' % control_type, control_state, target, HostType.control, control_contexts)
|
|
forward_ssh_ports(args, managed_connections, '%s_hosts_prepare.yml' % managed_type, managed_state, target, HostType.managed, managed_contexts)
|
|
|
|
def post_target(target):
|
|
cleanup_ssh_ports(args, control_connections, '%s_hosts_restore.yml' % control_type, control_state, target, HostType.control)
|
|
cleanup_ssh_ports(args, managed_connections, '%s_hosts_restore.yml' % managed_type, managed_state, target, HostType.managed)
|
|
else:
|
|
pre_target, post_target = None, None
|
|
|
|
return pre_target, post_target
|
|
|
|
|
|
def create_managed_contexts(control_contexts): # type: (t.Dict[str, t.Dict[str, ContainerAccess]]) -> t.Dict[str, t.Dict[str, ContainerAccess]]
|
|
"""Create managed contexts from the given control contexts."""
|
|
managed_contexts = {}
|
|
|
|
for context_name, control_context in control_contexts.items():
|
|
managed_context = managed_contexts[context_name] = {}
|
|
|
|
for container_name, control_container in control_context.items():
|
|
managed_context[container_name] = ContainerAccess(control_container.host_ip, control_container.names, None, dict(control_container.port_map()))
|
|
|
|
return managed_contexts
|
|
|
|
|
|
def forward_ssh_ports(
|
|
args, # type: IntegrationConfig
|
|
ssh_connections, # type: t.Optional[t.List[SshConnectionDetail]]
|
|
playbook, # type: str
|
|
target_state, # type: t.Dict[str, t.Tuple[t.List[str], t.List[SshProcess]]]
|
|
target, # type: IntegrationTarget
|
|
host_type, # type: str
|
|
contexts, # type: t.Dict[str, t.Dict[str, ContainerAccess]]
|
|
): # type: (...) -> None
|
|
"""Configure port forwarding using SSH and write hosts file entries."""
|
|
if ssh_connections is None:
|
|
return
|
|
|
|
test_context = None
|
|
|
|
for context_name, context in contexts.items():
|
|
context_alias = 'cloud/%s/' % context_name
|
|
|
|
if context_alias in target.aliases:
|
|
test_context = context
|
|
break
|
|
|
|
if not test_context:
|
|
return
|
|
|
|
if not ssh_connections:
|
|
raise Exception('The %s host was not pre-configured for container access and SSH forwarding is not available.' % host_type)
|
|
|
|
redirects = [] # type: t.List[t.Tuple[int, str, int]]
|
|
messages = []
|
|
|
|
for container_name, container in test_context.items():
|
|
explain = []
|
|
|
|
for container_port, access_port in container.port_map():
|
|
if container.forwards:
|
|
redirects.append((container_port, container.host_ip, access_port))
|
|
|
|
explain.append('%d -> %s:%d' % (container_port, container.host_ip, access_port))
|
|
else:
|
|
explain.append('%s:%d' % (container.host_ip, container_port))
|
|
|
|
if explain:
|
|
if container.forwards:
|
|
message = 'Port forwards for the "%s" container have been established on the %s host' % (container_name, host_type)
|
|
else:
|
|
message = 'Ports for the "%s" container are available on the %s host as' % (container_name, host_type)
|
|
|
|
messages.append('%s:\n%s' % (message, '\n'.join(explain)))
|
|
|
|
hosts_entries = create_hosts_entries(test_context)
|
|
inventory = generate_ssh_inventory(ssh_connections)
|
|
|
|
with named_temporary_file(args, 'ssh-inventory-', '.json', None, inventory) as inventory_path:
|
|
run_playbook(args, inventory_path, playbook, dict(hosts_entries=hosts_entries))
|
|
|
|
ssh_processes = [] # type: t.List[SshProcess]
|
|
|
|
if redirects:
|
|
for ssh in ssh_connections:
|
|
ssh_processes.append(create_ssh_port_redirects(args, ssh, redirects))
|
|
|
|
target_state[target.name] = (hosts_entries, ssh_processes)
|
|
|
|
for message in messages:
|
|
display.info(message, verbosity=1)
|
|
|
|
|
|
def cleanup_ssh_ports(
|
|
args, # type: IntegrationConfig
|
|
ssh_connections, # type: t.List[SshConnectionDetail]
|
|
playbook, # type: str
|
|
target_state, # type: t.Dict[str, t.Tuple[t.List[str], t.List[SshProcess]]]
|
|
target, # type: IntegrationTarget
|
|
host_type, # type: str
|
|
): # type: (...) -> None
|
|
"""Stop previously configured SSH port forwarding and remove previously written hosts file entries."""
|
|
state = target_state.pop(target.name, None)
|
|
|
|
if not state:
|
|
return
|
|
|
|
(hosts_entries, ssh_processes) = state
|
|
|
|
inventory = generate_ssh_inventory(ssh_connections)
|
|
|
|
with named_temporary_file(args, 'ssh-inventory-', '.json', None, inventory) as inventory_path:
|
|
run_playbook(args, inventory_path, playbook, dict(hosts_entries=hosts_entries))
|
|
|
|
if ssh_processes:
|
|
for process in ssh_processes:
|
|
process.terminate()
|
|
|
|
display.info('Waiting for the %s host SSH port forwarding processs(es) to terminate.' % host_type, verbosity=1)
|
|
|
|
for process in ssh_processes:
|
|
process.wait()
|