Add service_logs integration test

Signed-off-by: Joffrey F <joffrey@docker.com>

docker/api/service.py

@@ -167,6 +167,7 @@ class ServiceApiMixin(object):
         return self._result(self._get(url, params=params), True)
 
     @utils.minimum_version('1.25')
+    @utils.check_resource
     def service_logs(self, service, details=False, follow=False, stdout=False,
                      stderr=False, since=0, timestamps=False, tail='all',
                      is_tty=None):
@@ -176,7 +177,7 @@ class ServiceApiMixin(object):
             or ``journald`` logging drivers.
 
             Args:
-                service (str): ID or name of the container
+                service (str): ID or name of the service
                 details (bool): Show extra details provided to logs.
                     Default: ``False``
                 follow (bool): Keep connection open to read logs as they are

tests/helpers.py

@@ -1,3 +1,4 @@
+import functools
 import os
 import os.path
 import random
@@ -53,6 +54,15 @@ def requires_api_version(version):
     )
 
 
+def requires_experimental(f):
+    @functools.wraps(f)
+    def wrapped(self, *args, **kwargs):
+        if not self.client.info()['ExperimentalBuild']:
+            pytest.skip('Feature requires Docker Engine experimental mode')
+        return f(self, *args, **kwargs)
+    return wrapped
+
+
 def wait_on_condition(condition, delay=0.1, timeout=40):
     start_time = time.time()
     while not condition():

tests/integration/api_service_test.py

@@ -5,7 +5,9 @@ import time
 
 import docker
 
-from ..helpers import force_leave_swarm, requires_api_version
+from ..helpers import (
+    force_leave_swarm, requires_api_version, requires_experimental
+)
 from .base import BaseAPIIntegrationTest, BUSYBOX
 
 
@@ -27,13 +29,15 @@ class ServiceTest(BaseAPIIntegrationTest):
     def get_service_name(self):
         return 'dockerpytest_{0:x}'.format(random.getrandbits(64))
 
-    def get_service_container(self, service_name, attempts=20, interval=0.5):
+    def get_service_container(self, service_name, attempts=20, interval=0.5,
+                              include_stopped=False):
         # There is some delay between the service's creation and the creation
         # of the service's containers. This method deals with the uncertainty
         # when trying to retrieve the container associated with a service.
         while True:
             containers = self.client.containers(
-                filters={'name': [service_name]}, quiet=True
+                filters={'name': [service_name]}, quiet=True,
+                all=include_stopped
             )
             if len(containers) > 0:
                 return containers[0]
@@ -97,6 +101,18 @@ class ServiceTest(BaseAPIIntegrationTest):
         assert len(services) == 1
         assert services[0]['ID'] == svc_id['ID']
 
+    @requires_api_version('1.25')
+    @requires_experimental
+    def test_service_logs(self):
+        name, svc_id = self.create_simple_service()
+        assert self.get_service_container(name, include_stopped=True)
+        logs = self.client.service_logs(svc_id, stdout=True, is_tty=False)
+        log_line = next(logs)
+        assert 'hello\n' in log_line
+        assert 'com.docker.swarm.service.id={}'.format(
+            svc_id['ID']
+        ) in log_line
+
     def test_create_service_custom_log_driver(self):
         container_spec = docker.types.ContainerSpec(
             BUSYBOX, ['echo', 'hello']