1 # ============LICENSE_START=======================================================
3 # ================================================================================
4 # Copyright (c) 2017 AT&T Intellectual Property. All rights reserved.
5 # ================================================================================
6 # Licensed under the Apache License, Version 2.0 (the "License");
7 # you may not use this file except in compliance with the License.
8 # You may obtain a copy of the License at
10 # http://www.apache.org/licenses/LICENSE-2.0
12 # Unless required by applicable law or agreed to in writing, software
13 # distributed under the License is distributed on an "AS IS" BASIS,
14 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 # See the License for the specific language governing permissions and
16 # limitations under the License.
17 # ============LICENSE_END=========================================================
19 # ECOMP is a trademark and service mark of AT&T Intellectual Property.
21 # -*- coding: utf-8 -*-
23 Provides utilities for Docker components
26 from sys import platform
31 import dockering as doc
32 from dcae_cli.util.logger import get_logger
33 from dcae_cli.util.exc import DcaeException
36 dlog = get_logger('Docker')
38 _reg_img = 'gliderlabs/registrator:latest'
39 # TODO: Source this from app's configuration [ONAP URL TBD]
40 _reg_cmd = '-ip {:} consul://make-me-valid:8500'
42 class DockerError(DcaeException):
45 class DockerConstructionError(DcaeException):
49 # Functions to provide envs to pass into Docker containers
51 def _convert_profile_to_docker_envs(profile):
52 """Convert a profile object to Docker environment variables
60 dict of environemnt variables to be used by docker-py
62 profile = profile._asdict()
63 return dict([(key.upper(), value) for key, value in six.iteritems(profile)])
66 def build_envs(profile, docker_config, instance_name):
67 profile_envs = _convert_profile_to_docker_envs(profile)
68 health_envs = doc.create_envs_healthcheck(docker_config)
69 return doc.create_envs(instance_name, profile_envs, health_envs)
72 # Methods to call Docker engine
74 # TODO: Consolidate these two docker client methods. Need ability to invoke local
75 # vs remote Docker engine
77 def get_docker_client(profile):
78 base_url = "tcp://{0}".format(profile.docker_host)
80 client = docker.Client(base_url=base_url)
84 raise DockerError('Could not connect to the Docker daemon. Is it running?')
86 def _get_docker_client(client_funcs=(docker.Client, docker.from_env)):
87 '''Returns a docker client object'''
88 for func in client_funcs:
90 client = func(version='auto')
95 raise DockerError('Could not connect to the Docker daemon. Is it running?')
98 def image_exists(image):
99 '''Returns True if the image exists locally'''
100 client = _get_docker_client()
101 return True if client.images(image) else False
105 '''Infers the IP address of the host running this tool'''
106 if not platform.startswith('linux'):
107 raise DockerError('Non-linux environment detected. Use the --external-ip flag when running Docker components.')
108 ip = socket.gethostbyname(socket.gethostname())
109 dlog.info("Docker host external IP address inferred to be {:}. If this is incorrect, use the --external-ip flag.".format(ip))
113 def _run_container(client, config, name=None, wait=False):
114 '''Runs a container'''
116 info = six.next(iter(client.containers(all=True, filters={'name': "^/{:}$".format(name)})), None)
118 if info['State'] == 'running':
119 dlog.info("Container '{:}' was detected as already running.".format(name))
122 client.remove_container(info['Id'])
124 cont = doc.create_container_using_config(client, name, config)
126 info = client.inspect_container(cont)
127 name = info['Name'][1:] # remove '/' prefix
128 image = config['Image']
129 dlog.info("Running image '{:}' as '{:}'".format(image, name))
134 cont_log = dlog.getChild(name)
136 for msg in client.logs(cont, stream=True):
137 cont_log.info(msg.decode())
139 dlog.info("Container '{:}' exitted suddenly.".format(name))
140 except (KeyboardInterrupt, SystemExit):
141 dlog.info("Stopping container '{:}' and cleaning up...".format(name))
143 client.remove_container(cont)
146 def _run_registrator(client, external_ip=None):
147 '''Ensures that Registrator is running'''
149 ip = _infer_ip() if external_ip is None else external_ip
150 cmd = _reg_cmd.format(ip).split()
152 binds={'/var/run/docker.sock': {'bind': '/tmp/docker.sock'}}
153 hconf = client.create_host_config(binds=binds, network_mode='host')
154 conf = client.create_container_config(image=_reg_img, command=cmd, host_config=hconf)
156 _run_container(client, conf, name='registrator', wait=False)
159 # TODO: Need to revisit and reimplement _run_registrator(client, external_ip)
165 def deploy_component(profile, image, instance_name, docker_config, should_wait=False):
166 """Deploy Docker component
168 This calls runs a Docker container detached. The assumption is that the Docker
169 host already has registrator running.
171 TODO: Split out the wait functionality
175 Dict that is the result from a Docker inspect call
177 ports = docker_config.get("ports", None)
178 hcp = doc.add_host_config_params_ports(ports=ports)
179 volumes = docker_config.get("volumes", None)
180 hcp = doc.add_host_config_params_volumes(volumes=volumes, host_config_params=hcp)
181 # Thankfully passing in an IP will return back an IP
182 dh = profile.docker_host.split(":")[0]
183 _, _, dhips = socket.gethostbyname_ex(dh)
186 hcp = doc.add_host_config_params_dns(dhips[0], hcp)
188 raise DockerConstructionError("Could not resolve the docker hostname:{0}".format(dh))
190 envs = build_envs(profile, docker_config, instance_name)
191 client = get_docker_client(profile)
193 config = doc.create_container_config(client, image, envs, hcp)
194 return _run_container(client, config, name=instance_name, wait=should_wait)
197 def undeploy_component(client, image, instance_name):
198 """Undeploy Docker component
200 TODO: Handle error scenarios. Look into:
201 * no container found error - docker.errors.NotFound
202 * failure to remove image - docker.errors.APIError: 409 Client Error
203 * retry, check for still running container
207 True if the container and associated image has been removed False otherwise
210 client.remove_container(instance_name, force=True)
211 client.remove_image(image)
213 except Exception as e:
214 dlog.error("Error while undeploying Docker container/image: {0}".format(e))