Use monasca/python for monasca/api-python (#221)

monasca/python provides a foundation for the Python
monasca components and several features & fixes that
concern and affects all Python applications.

!push monasca-api-python

monasca-api-python/Dockerfile

@@ -1,7 +1,11 @@
-FROM alpine:3.5
+ARG TIMESTAMP_SLUG
+# monasca-api cannot run under Python3
+# enforcing Python2
+FROM monasca/python:2-${TIMESTAMP_SLUG}
 
 ARG API_REPO=https://github.com/openstack/monasca-api.git
 ARG API_BRANCH=master
+ARG CONSTRAINTS_BRANCH=master
 
 # To force a rebuild, pass --build-arg REBUILD="$(DATE)" when running
 # `docker build`
@@ -34,20 +38,10 @@ ENV CONFIG_TEMPLATE=true \
   ACCESS_LOG_FORMAT="%(asctime)s [%(process)d] gunicorn.access [%(levelname)s] %(message)s" \
   ACCESS_LOG_FIELDS='%(h)s %(l)s %(u)s %(t)s %(r)s %(s)s %(b)s "%(f)s" "%(a)s" %(L)s'
 
-RUN apk add --no-cache python py2-pip py2-jinja2 curl mysql-client && \
-  apk add --no-cache --virtual build-dep \
-    python-dev git make g++ linux-headers && \
-  mkdir /monasca-api && cd /monasca-api && \
-  git init && \
-  git remote add origin $API_REPO && \
-  git fetch origin $API_BRANCH && \
-  git reset --hard FETCH_HEAD && \
-  pip install --no-cache-dir gunicorn influxdb \
-    python-memcached -r requirements.txt && \
-  python setup.py install && \
-  cd / && \
-  rm -rf /monasca-api && \
-  apk del build-dep
+COPY apk_install.sh /apk.sh
+RUN /build.sh -r ${API_REPO} -b ${API_BRANCH} \
+  -q ${CONSTRAINTS_BRANCH} -d "gunicorn influxdb python-memcached Jinja2" && \
+  rm -rf /build.sh
 
 COPY api-* /etc/monasca/
 COPY template.py start.sh health-check.sh kafka_wait_for_topics.py /

monasca-api-python/apk_install.sh

@@ -0,0 +1,4 @@
+install_apk_deps() {
+    apk add --no-cache curl mysql-client
+    apk add --no-cache --virtual build-dep git make g++ linux-headers
+}

monasca-api-python/build.yml

@@ -5,3 +5,5 @@ variants:
       - :master-{date}-{time}
     args:
       API_BRANCH: refs/changes/63/417163/10
+      CONSTRAINTS_BRANCH: master
+      TIMESTAMP_SLUG: 20170809-155207