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https://github.com/thib8956/nginx-proxy
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TESTS: add support for resolving containers IP address from domain names in the form *.<container name>.container.docker
This commit is contained in:
Thomas LEVEIL
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743d9801e9
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a533ff6aff
@ -17,6 +17,10 @@ Prepare the nginx-proxy test image
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docker build -t jwilder/nginx-proxy:test ..
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or if you want to test the alpine flavor:
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docker build -t jwilder/nginx-proxy:test -f Dockerfile.alpine ..
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make sure to tag that test image exactly `jwilder/nginx-proxy:test` or the test suite won't work.
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@ -44,17 +48,6 @@ This test suite uses [pytest](http://doc.pytest.org/en/latest/). The [conftest.p
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- docker_compose
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- nginxproxy
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Also _conftest.py_ alters the way the python interpreter resolves domain names to IP addresses in such a way that any domain name containing the substring `nginx-proxy` will resolve to the IP address of the container that was created from the `jwilder/nginx-proxy:test` image.
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So all the following domain names will resolve to the nginx-proxy container in tests:
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- `nginx-proxy`
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- `nginx-proxy.com`
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- `www.nginx-proxy.com`
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- `www.nginx-proxy.test`
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- `www.nginx-proxy`
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- `whatever.nginx-proxyooooooo`
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- ...
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### docker_compose fixture
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@ -68,6 +61,26 @@ The fixture will run the _docker-compose_ command with the `-f` option to load t
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In the case you are running pytest from within a docker container, the `docker_compose` fixture will make sure the container running pytest is attached to all docker networks. That way, your test will be able to reach any of them.
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In your tests, you can use the `docker_compose` variable to query and command the docker daemon as it provides you with a [client from the docker python module](https://docker-py.readthedocs.io/en/2.0.2/client.html#client-reference).
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Also this fixture alters the way the python interpreter resolves domain names to IP addresses in the following ways:
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Any domain name containing the substring `nginx-proxy` will resolve to the IP address of the container that was created from the `jwilder/nginx-proxy:test` image. So all the following domain names will resolve to the nginx-proxy container in tests:
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- `nginx-proxy`
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- `nginx-proxy.com`
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- `www.nginx-proxy.com`
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- `www.nginx-proxy.test`
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- `www.nginx-proxy`
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- `whatever.nginx-proxyooooooo`
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- ...
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Any domain name ending with `XXX.container.docker` will resolve to the IP address of the XXX container.
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- `web1.container.docker` will resolve to the IP address of the `web1` container
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- `f00.web1.container.docker` will resolve to the IP address of the `web1` container
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- `anything.whatever.web2.container.docker` will resolve to the IP address of the `web2` container
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Otherwise, domain names are resoved as usual using your system DNS resolver.
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### nginxproxy fixture
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@ -6,6 +6,7 @@ import shlex
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import socket
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import subprocess
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import time
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import re
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import backoff
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import docker
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@ -14,7 +15,7 @@ import requests
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logging.basicConfig(level=logging.INFO)
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logging.getLogger('backoff').setLevel(logging.INFO)
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logging.getLogger('patched DNS').setLevel(logging.INFO)
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logging.getLogger('DNS').setLevel(logging.INFO)
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logging.getLogger('requests.packages.urllib3.connectionpool').setLevel(logging.WARN)
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CA_ROOT_CERTIFICATE = os.path.join(os.path.dirname(__file__), 'certs/ca-root.crt')
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@ -92,33 +93,90 @@ class requests_for_docker(object):
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return getattr(requests, name)
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def container_ip(container):
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"""
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return the IP address of a container
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"""
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net_info = container.attrs["NetworkSettings"]["Networks"]
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if "bridge" in net_info:
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return net_info["bridge"]["IPAddress"]
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# not default bridge network, fallback on first network defined
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network_name = net_info.keys()[0]
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return net_info[network_name]["IPAddress"]
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def nginx_proxy_dns_resolver(domain_name):
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"""
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if "nginx-proxy" if found in domain_name, return the ip address of the docker container
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issued from the docker image jwilder/nginx-proxy:test.
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:return: IP or None
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"""
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log = logging.getLogger('DNS')
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log.debug("nginx_proxy_dns_resolver(%r)" % domain_name)
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if 'nginx-proxy' in domain_name:
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nginxproxy_containers = docker_client.containers.list(filters={"status": "running", "ancestor": "jwilder/nginx-proxy:test"})
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if len(nginxproxy_containers) == 0:
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log.warn("no container found from image jwilder/nginx-proxy:test while resolving %r", domain_name)
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return
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nginxproxy_container = nginxproxy_containers[0]
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ip = container_ip(nginxproxy_container)
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log.info("resolving domain name %r as IP address %s of nginx-proxy container %s" % (domain_name, ip, nginxproxy_container.name))
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return ip
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def docker_container_dns_resolver(domain_name):
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"""
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if domain name is of the form "XXX.container.docker" or "anything.XXX.container.docker", return the ip address of the docker container
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named XXX.
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:return: IP or None
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"""
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log = logging.getLogger('DNS')
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log.debug("docker_container_dns_resolver(%r)" % domain_name)
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match = re.search('(^|.+\.)(?P<container>[^.]+)\.container\.docker$', domain_name)
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if not match:
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log.debug("%r does not match" % domain_name)
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return
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container_name = match.group('container')
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log.debug("looking for container %r" % container_name)
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try:
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container = docker_client.containers.get(container_name)
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except docker.errors.NotFound:
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log.warn("container named %r not found while resolving %r" % (container_name, domain_name))
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return
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log.debug("container %r found (%s)" % (container.name, container.short_id))
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ip = container_ip(container)
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log.info("resolving domain name %r as IP address %s of container %s" % (domain_name, ip, container.name))
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return ip
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def monkey_patch_urllib_dns_resolver():
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"""
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Alter the behavior of the urllib DNS resolver so that any domain name
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containing substring 'nginx-proxy' will resolve to the IP address
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of the container created from image 'jwilder/nginx-proxy:test'.
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"""
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log = logging.getLogger("patched DNS")
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prv_getaddrinfo = socket.getaddrinfo
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dns_cache = {}
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def new_getaddrinfo(*args):
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log.debug("resolving domain name %s" % repr(args))
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if 'nginx-proxy' in args[0]:
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nginxproxy_container = docker_client.containers.list(filters={"status": "running", "ancestor": "jwilder/nginx-proxy:test"})[0]
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net_info = nginxproxy_container.attrs["NetworkSettings"]["Networks"]
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if "bridge" in net_info:
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ip = net_info["bridge"]["IPAddress"]
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else:
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# not default bridge network, fallback on first network defined
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network_name = net_info.keys()[0]
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ip = net_info[network_name]["IPAddress"]
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log.info("resolving domain name %r as IP address is %s" % (args[0], ip))
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logging.getLogger('DNS').debug("resolving domain name %s" % repr(args))
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# custom DNS resolvers
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ip = nginx_proxy_dns_resolver(args[0])
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if ip is None:
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ip = docker_container_dns_resolver(args[0])
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if ip is not None:
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return [
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(socket.AF_INET, socket.SOCK_STREAM, 6, '', (ip, args[1])),
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(socket.AF_INET, socket.SOCK_DGRAM, 17, '', (ip, args[1])),
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(socket.AF_INET, socket.SOCK_RAW, 0, '', (ip, args[1]))
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]
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# fallback on original DNS resolver
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try:
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return dns_cache[args]
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except KeyError:
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@ -179,7 +237,6 @@ def wait_for_nginxproxy_to_be_ready():
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container = containers[0]
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for line in container.logs(stream=True):
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if "Watching docker events" in line:
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time.sleep(1) # give time to docker-gen to produce the new nginx config and reload nginx
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logging.debug("nginx-proxy ready")
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break
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@ -223,7 +280,11 @@ def connect_to_network(network):
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:return: the name of the network we were connected to, or None
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"""
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if I_AM_RUNNING_INSIDE_A_DOCKER_CONTAINER:
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my_container = docker_client.containers.get(socket.gethostname())
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try:
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my_container = docker_client.containers.get(socket.gethostname())
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except docker.errors.NotFound:
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logging.warn("container %r not found" % socket.gethostname())
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return
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# figure out our container networks
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my_networks = my_container.attrs["NetworkSettings"]["Networks"].keys()
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@ -242,7 +303,11 @@ def disconnect_from_network(network=None):
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:param network: name of a docker network to disconnect from
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"""
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if I_AM_RUNNING_INSIDE_A_DOCKER_CONTAINER and network is not None:
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my_container = docker_client.containers.get(socket.gethostname())
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try:
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my_container = docker_client.containers.get(socket.gethostname())
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except docker.errors.NotFound:
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logging.warn("container %r not found" % socket.gethostname())
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return
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# figure out our container networks
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my_networks_names = my_container.attrs["NetworkSettings"]["Networks"].keys()
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@ -289,7 +354,8 @@ def docker_compose(request):
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docker_compose_up(docker_compose_file)
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networks = connect_to_all_networks()
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wait_for_nginxproxy_to_be_ready()
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yield
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time.sleep(3) # give time to containers to be ready
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yield docker_client
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for network in networks:
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disconnect_from_network(network)
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docker_compose_down(docker_compose_file)
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