Return 0 when no pid, do the same for backend pid, and add packages to Dockerfile template

Author: ildus

Dockerfile.tmpl

@@ -2,10 +2,10 @@ FROM postgres:${PG_VERSION}-alpine
 
 ENV PYTHON=python${PYTHON_VERSION}
 RUN if [ "${PYTHON_VERSION}" = "2" ] ; then \
-	apk add --no-cache curl python2 py-virtualenv py-pip; \
+	apk add --no-cache curl python2 python2-dev gcc py-virtualenv py-pip; \
 	fi
 RUN if [ "${PYTHON_VERSION}" = "3" ] ; then \
-	apk add --no-cache curl python3 py-virtualenv; \
+	apk add --no-cache curl python3 python3-dev gcc py-virtualenv; \
 	fi
 ENV LANG=C.UTF-8
 

testgres/connection.py

@@ -34,7 +34,7 @@ def __init__(self, node, dbname=None, username=None, password=None):
         username = username or default_username()
 
         self._node = node
-        self._backend_pid = None
+        self._backend_pid = 0
 
         self._connection = pglib.connect(
             database=dbname,
@@ -55,7 +55,7 @@ def connection(self):
 
     @property
     def backend_pid(self):
-        if self._backend_pid is None:
+        if not self._backend_pid:
             self._backend_pid = self.execute("select pg_backend_pid();")[0][0]
         return self._backend_pid
 

testgres/node.py

@@ -439,7 +439,7 @@ def get_main_pid(self):
                 return int(f.readline())
 
         # for clarity
-        return None
+        return 0
 
     def get_child_processes(self):
         ''' Returns child processes for this node '''

tests/test_simple.py

@@ -205,27 +205,27 @@ def test_status(self):
 
         # check statuses after each operation
         with get_new_node() as node:
-            self.assertIsNone(node.pid)
+            self.assertEqual(node.pid, 0)
             self.assertEqual(node.status(), NodeStatus.Uninitialized)
 
             node.init()
 
-            self.assertIsNone(node.pid)
+            self.assertEqual(node.pid, 0)
             self.assertEqual(node.status(), NodeStatus.Stopped)
 
             node.start()
 
-            self.assertIsNotNone(node.pid)
+            self.assertNotEqual(node.pid, 0)
             self.assertEqual(node.status(), NodeStatus.Running)
 
             node.stop()
 
-            self.assertIsNone(node.pid)
+            self.assertEqual(node.pid, 0)
             self.assertEqual(node.status(), NodeStatus.Stopped)
 
             node.cleanup()
 
-            self.assertIsNone(node.pid)
+            self.assertEqual(node.pid, 0)
             self.assertEqual(node.status(), NodeStatus.Uninitialized)
 
     def test_psql(self):