Add file validator for *.json.j2 file

All json file in Kolla are json.j2 file, it shold be render as jinja
template, then validate by using json.

Change-Id: Ibabbe435116fd255d68347e00407156db76fedfe
Closes-Bug: #1634447

tools/validate-all-file.py

@@ -12,18 +12,26 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import collections
 import fnmatch
+import json
 import logging
 import os
 import re
 import sys
 
+import jinja2
+
 
 PROJECT_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
 
 NEWLINE_EOF_INCLUDE_PATTERNS = ['*.j2', '*.yml', '*.py', '*.sh']
 NEWLINE_EOF_EXCLUDE_PATTERNS = ['.tox', '.testrepository', '.git']
 
+# Render json file by using jinja2 template is OK
+JSON_J2_INCLUDE_PATTERNS = ['*.json.j2', '*.json']
+JSON_J2_EXCLUDE_PATTERNS = ['.tox', '.testrepository', '.git']
+
 logging.basicConfig()
 LOG = logging.getLogger(__name__)
 
@@ -52,9 +60,54 @@ def check_newline_eof():
     return return_code
 
 
-def main():
+def check_json_j2():
-    return sum([check_newline_eof()])
+    includes = r'|'.join([fnmatch.translate(x)
+                          for x in JSON_J2_INCLUDE_PATTERNS])
+    excludes = r'|'.join([fnmatch.translate(x)
+                          for x in JSON_J2_EXCLUDE_PATTERNS])
+    return_code = 0
 
+    def bool_filter(value):
+        return True
+
+    # Mock ansible hostvars variable, which is a nested dict
+    def hostvars():
+        return collections.defaultdict(hostvars)
+
+    def validate_json_j2(root, filename):
+        env = jinja2.Environment(  # nosec: not used to render HTML
+            loader=jinja2.FileSystemLoader(root))
+        env.filters['bool'] = bool_filter
+        template = env.get_template(filename)
+        # Mock ansible variables.
+        context = {
+            'hostvars': hostvars(),
+            'cluster_interface': 'cluster_interface',
+            'storage_interface': 'storage_interface',
+            'inventory_hostname': 'hostname'
+        }
+        data = template.render(**context)
+        json.loads(data)
+    for root, dirs, files in os.walk(PROJECT_ROOT):
+        dirs[:] = [d for d in dirs if not re.match(excludes, d)]
+        for filename in files:
+            if not re.match(excludes, filename) and \
+                    re.match(includes, filename):
+                fullpath = os.path.join(root, filename)
+                try:
+                    validate_json_j2(root, filename)
+                except (ValueError, jinja2.exceptions.TemplateError):
+                    return_code = 1
+                    LOG.exception('%s file error', fullpath)
+    return return_code
+
+
+def main():
+    checks = (
+        check_newline_eof,
+        check_json_j2
+    )
+    return sum([check() for check in checks])
 
 if __name__ == "__main__":
     sys.exit(main())

tools/validate-all-json.sh

@@ -1,7 +0,0 @@
-#!/bin/bash
-
-REAL_PATH=$(python -c "import os,sys;print os.path.realpath('$0')")
-cd "$(dirname "$REAL_PATH")/.."
-
-find . -path ./.tox -prune -name '*.json' -print0 |
-    xargs -0 python tools/validate-json.py || exit 1

tools/validate-json.py

@@ -1,44 +0,0 @@
-#!/usr/bin/python
-
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import argparse
-import json
-import logging
-import sys
-
-
-def parse_args():
-    p = argparse.ArgumentParser()
-    p.add_argument('input', nargs='*')
-    return p.parse_args()
-
-
-def main():
-    args = parse_args()
-    logging.basicConfig()
-    res = 0
-
-    for filename in args.input:
-        with open(filename) as fd:
-            try:
-                json.load(fd)
-            except ValueError as error:
-                res = 1
-                logging.error('%s failed validation: %s',
-                              filename, error)
-
-    sys.exit(res)
-
-if __name__ == '__main__':
-    main()

tox.ini

@@ -25,10 +25,8 @@ commands = oslo_debug_helper {posargs}
 commands =
   {toxinidir}/tools/run-bashate.sh
   flake8 {posargs}
-  {toxinidir}/tools/validate-all-json.sh
-  {toxinidir}/tools/validate-all-yaml.sh
   {toxinidir}/tools/validate-all-dockerfiles.sh
-  {toxinidir}/tools/validate-all-file.py
+  python {toxinidir}/tools/validate-all-file.py
   bandit -r ansible/library docker kolla tests tools
 
 [testenv:bandit]