filter internal services

compose_plantuml/__init__.py

@@ -26,11 +26,14 @@ def boundaries(self, compose):
 
         result += 'cloud system {\n'
         for component in sorted(self.components(compose)):
-            result += '  [{0}]\n'.format(component)
+            if self.has_service_external_ports(compose, component) or self.has_service_volumes(compose, component):
+                result += '  [{0}]\n'.format(component)
         result += '}\n'
         volume_registry = {}
 
         for volume in sorted(self.volumes(compose)):
+            if not self.is_volume_used(compose, volume):
+                continue
             result += 'database {0}'.format(volume) + ' {\n'
             for path in sorted(self.volume_usage(compose, volume)):
                 id = self.volume_identifier(volume, path)
@@ -56,6 +59,57 @@ def boundaries(self, compose):
                 result += '[{0}] --> {1}\n'.format(service, name)
         return result.strip()
 
+    @staticmethod
+    def is_volume_used(compose, volume):
+        components = compose if 'version' not in compose else compose.get('services', {})
+
+        for _, component in components.items():
+            for volume_name in component.get('volumes', {}):
+                if volume_name.startswith('{0}:'.format(volume)):
+                    return True
+        return False
+
+    @staticmethod
+    def is_service_used(compose, service):
+        components = compose if 'version' not in compose else compose.get('services', {})
+
+        for _, component in components.items():
+            for link in component.get('links', []):
+                link = link if ':' not in link else link.split(':')[0]
+                if link == service:
+                    return True
+
+            for dependency in component.get('depends_on', []):
+                if dependency == service:
+                    return True
+        return False
+
+    @staticmethod
+    def has_service_external_ports(compose, service):
+        components = compose if 'version' not in compose else compose.get('services', {})
+
+        for name, component in components.items():
+            if service != name:
+                continue
+            return 'ports' in component
+        return False
+
+    @staticmethod
+    def has_service_volumes(compose, service):
+        components = compose if 'version' not in compose else compose.get('services', {})
+
+        for name, component in components.items():
+            if service != name:
+                continue
+            if 'volumes' not in component:
+                return False
+            for volume in component['volumes']:
+                if volume.startswith('/'):
+                    continue
+                if ':' in volume:
+                    return True
+        return False
+
     @staticmethod
     def volume_identifier(volume, path):
         return '{0}.{1}'.format(volume, path)

features/boundaries.feature

@@ -68,6 +68,33 @@ Feature: Boundaries
 
       """
 
+  Scenario: Filter internal services
+    Given a file named "compose.yml" with:
+      """
+      version: "2"
+      services:
+        service:
+          volumes:
+            - service_log:/log
+        unused_service: {}
+      volumes:
+        service_log: {}
+        unused_volume: {}
+      """
+    When I run `bin/compose_plantuml --boundaries compose.yml`
+    Then it should pass with exactly:
+      """
+      skinparam componentStyle uml2
+      cloud system {
+        [service]
+      }
+      database service_log {
+        [/log] as volume_1
+      }
+      [service] --> volume_1
+
+      """
+
   Scenario: Suppport for legacy docker-compose format
     Given a file named "compose.yml" with:
       """

setup.py

@@ -7,7 +7,7 @@ def readme():
 
 setup(
     name='compose_plantuml',
-    version='0.0.7',
+    version='0.0.8',
     description='converts docker-compose into plantuml',
     long_description=readme(),
     url='http://github.com/funkwerk/compose_plantuml',