Fixing docker-compose port with scale (#667)

Fixes #667 and Closes #735 (taking over it)

Signed-off-by: Vincent Demeester <[email protected]>

compose/cli/main.py

@@ -170,13 +170,14 @@ class TopLevelCommand(Command):
         Usage: port [options] SERVICE PRIVATE_PORT
 
         Options:
-            --protocol=proto  tcp or udp (defaults to tcp)
+            --protocol=proto  tcp or udp [default: tcp]
             --index=index     index of the container if there are multiple
-                              instances of a service (defaults to 1)
+                              instances of a service [default: 1]
         """
+        index = int(options.get('--index'))
         service = project.get_service(options['SERVICE'])
         try:
-            container = service.get_container(number=options.get('--index') or 1)
+            container = service.get_container(number=index)
         except ValueError as e:
             raise UserError(str(e))
         print(container.get_local_port(

tests/fixtures/ports-composefile-scale/docker-compose.yml

@@ -0,0 +1,6 @@
+
+simple:
+  image: busybox:latest
+  command: /bin/sleep 300
+  ports:
+    - '3000'

tests/integration/cli_test.py

@@ -1,4 +1,5 @@
 from __future__ import absolute_import
+from operator import attrgetter
 import sys
 import os
 import shlex
@@ -436,6 +437,27 @@ class CLITestCase(DockerClientTestCase):
         self.assertEqual(get_port(3001), "0.0.0.0:49152")
         self.assertEqual(get_port(3002), "")
 
+    def test_port_with_scale(self):
+
+        self.command.base_dir = 'tests/fixtures/ports-composefile-scale'
+        self.command.dispatch(['scale', 'simple=2'], None)
+        containers = sorted(
+            self.project.containers(service_names=['simple']),
+            key=attrgetter('name'))
+
+        @patch('sys.stdout', new_callable=StringIO)
+        def get_port(number, mock_stdout, index=None):
+            if index is None:
+                self.command.dispatch(['port', 'simple', str(number)], None)
+            else:
+                self.command.dispatch(['port', '--index=' + str(index), 'simple', str(number)], None)
+            return mock_stdout.getvalue().rstrip()
+
+        self.assertEqual(get_port(3000), containers[0].get_local_port(3000))
+        self.assertEqual(get_port(3000, index=1), containers[0].get_local_port(3000))
+        self.assertEqual(get_port(3000, index=2), containers[1].get_local_port(3000))
+        self.assertEqual(get_port(3002), "")
+
     def test_env_file_relative_to_compose_file(self):
         config_path = os.path.abspath('tests/fixtures/env-file/docker-compose.yml')
         self.command.dispatch(['-f', config_path, 'up', '-d'], None)