Let Docker decide container ports

.travis.yml

@@ -11,6 +11,9 @@ python:
 before_install:
   - docker run -d --name=dynalite -p 8000:8000 rajatvig/dynalite-alpine:latest
   - docker run -d --name=s3 -p 4567:4567 verespej/fake-s3:latest
+env:
+  DYNAMODB_ENDPOINT: http://localhost:8000
+  S3_ENDPOINT: http://localhost:4567
 install:
   - pip install -r requires/testing.txt
 script: nosetests

bootstrap

+#!/bin/sh
+#
+# NAME
+#    bootstrap -- initialize/update docker environment
+#
+# SYNOPSIS
+#    bootstrap
+#    bootstrap shellinit
+#
+# DESCRIPTION
+#    Execute this script without parameters to build the local docker
+#    environment.  Once bootstrapped, dependent services are running
+#    via docker-compose and the environment variables are written to
+#    *build/test-environment* for future use.
+#
+#    Running this script with the _shellinit_ command line parameter
+#    causes it to simply interrogate the running docker environment,
+#    update *build/test-environment*, and print the environment to
+#    the standard output stream in a shell executable manner.  This
+#    makes the following pattern for setting environment variables
+#    in the current shell work.
+#
+#        prompt% $(./bootstrap shellinit)
+#
+# vim: set ts=2 sts=2 sw=2 et:
+if test -e /var/run/docker.sock
+then
+  DOCKER_IP=127.0.0.1
+else
+  echo "Failed to initialize docker environment"
+  exit 2
+fi
+
+get_exposed_port() {
+  docker-compose port $1 $2 | cut -d: -f2
+}
+
+build_env_file() {
+cat > $1<<EOF
+export DYNAMODB_ENDPOINT=http://${DOCKER_IP}:$(get_exposed_port dynalite 8000)
+export S3_ENDPOINT=http://${DOCKER_IP}:$(get_exposed_port s3 4567)
+EOF
+}
+
+set -e
+
+mkdir -p build
+
+if test "$1" = 'shellinit'
+then
+  # just build the environment file from docker containers
+  build_env_file build/test-environment
+else
+  docker-compose down --volumes --remove-orphans
+  docker-compose up -d
+  build_env_file build/test-environment
+fi
+cat build/test-environment

docker-compose.yml

 dynalite:
   image: rajatvig/dynalite-alpine:latest
   ports:
-    - 8000:8000
+    - 8000
 s3:
   image: verespej/fake-s3:latest
   ports:
-    - 4567:4567
+    - 4567

tests/integration_tests.py

@@ -24,6 +24,9 @@ CREATE_BUCKET_BODY = """\
 </CreateBucketConfiguration>
 """
+DYNAMODB_ENDPOINT = os.environ['DYNAMODB_ENDPOINT']
+S3_ENDPOINT = os.environ['S3_ENDPOINT']
+
 class DynamoDBTestCase(testing.AsyncTestCase):
@@ -84,7 +87,7 @@ class DynamoDBTestCase(testing.AsyncTestCase):
         os.environ['AWS_SECRET_ACCESS_KEY'] = str(uuid.uuid4())
         os.environ['AWS_DEFAULT_REGION'] = 'local'
         self.client = tornado_aws.AsyncAWSClient(
-            'dynamodb', endpoint='http://localhost:8000')
+            'dynamodb', endpoint=DYNAMODB_ENDPOINT)
     @testing.gen_test
     def test_create_table(self):
@@ -111,7 +114,7 @@ class UseCurlDynamoDBTestCase(DynamoDBTestCase):
         os.environ['AWS_SECRET_ACCESS_KEY'] = str(uuid.uuid4())
         os.environ['AWS_DEFAULT_REGION'] = 'local'
         self.client = tornado_aws.AsyncAWSClient(
-            'dynamodb', endpoint='http://localhost:8000', use_curl=True)
+            'dynamodb', endpoint=DYNAMODB_ENDPOINT, use_curl=True)
     @unittest.skipIf(curl_httpclient is None, 'pycurl not installed')
     def test_create_table(self):
@@ -141,7 +144,7 @@ class S3TestCase(testing.AsyncTestCase):
         os.environ['AWS_SECRET_ACCESS_KEY'] = str(uuid.uuid4())
         os.environ['AWS_DEFAULT_REGION'] = 'local'
         self.client = tornado_aws.AsyncAWSClient(
-            's3', endpoint='http://localhost:4567')
+            's3', endpoint=S3_ENDPOINT)
         self.bucket = uuid.uuid4().hex
         self.headers = {'Host': '{}.s3.amazonaws.com'.format(self.bucket)}