Initial checkin of gRPC to third_party/

third_party/grpc/tools/buildgen/mako_renderer.py

Index: third_party/grpc/tools/buildgen/mako_renderer.py
diff --git a/third_party/grpc/tools/buildgen/mako_renderer.py b/third_party/grpc/tools/buildgen/mako_renderer.py
new file mode 100755
index 0000000000000000000000000000000000000000..5f23f123c2df11b39c15fe4f16e37d8e58701c24
--- /dev/null
+++ b/third_party/grpc/tools/buildgen/mako_renderer.py
@@ -0,0 +1,192 @@
+#!/usr/bin/env python2.7
+# Copyright 2015-2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+"""Simple Mako renderer.
+
+Just a wrapper around the mako rendering library.
+
+"""
+
+import getopt
+import imp
+import os
+import cPickle as pickle
+import shutil
+import sys
+
+
+from mako.lookup import TemplateLookup
+from mako.runtime import Context
+from mako.template import Template
+import bunch
+import yaml
+
+
+# Imports a plugin
+def import_plugin(name):
+  _, base_ex = os.path.split(name)
+  base, _ = os.path.splitext(base_ex)
+
+  with open(name, 'r') as plugin_file:
+    plugin_code = plugin_file.read()
+  plugin_module = imp.new_module(base)
+  exec plugin_code in plugin_module.__dict__
+  return plugin_module
+
+
+def out(msg):
+  print >> sys.stderr, msg
+
+
+def showhelp():
+  out('mako-renderer.py [-o out] [-m cache] [-P preprocessed_input] [-d dict] [-d dict...]'
+      ' [-t template] [-w preprocessed_output]')
+
+
+def main(argv):
+  got_input = False
+  module_directory = None
+  preprocessed_output = None
+  dictionary = {}
+  json_dict = {}
+  got_output = False
+  plugins = []
+  output_name = None
+  got_preprocessed_input = False
+
+  try:
+    opts, args = getopt.getopt(argv, 'hm:d:o:p:t:P:w:')
+  except getopt.GetoptError:
+    out('Unknown option')
+    showhelp()
+    sys.exit(2)
+
+  for opt, arg in opts:
+    if opt == '-h':
+      out('Displaying showhelp')
+      showhelp()
+      sys.exit()
+    elif opt == '-o':
+      if got_output:
+        out('Got more than one output')
+        showhelp()
+        sys.exit(3)
+      got_output = True
+      output_name = arg
+    elif opt == '-m':
+      if module_directory is not None:
+        out('Got more than one cache directory')
+        showhelp()
+        sys.exit(4)
+      module_directory = arg
+    elif opt == '-P':
+      assert not got_preprocessed_input
+      assert json_dict == {}
+      sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), 'plugins')))
+      with open(arg, 'r') as dict_file:
+        dictionary = pickle.load(dict_file)
+      got_preprocessed_input = True
+    elif opt == '-d':
+      assert not got_preprocessed_input
+      with open(arg, 'r') as dict_file:
+        bunch.merge_json(json_dict, yaml.load(dict_file.read()))
+    elif opt == '-p':
+      plugins.append(import_plugin(arg))
+    elif opt == '-w':
+      preprocessed_output = arg
+
+  if not got_preprocessed_input:
+    for plugin in plugins:
+      plugin.mako_plugin(json_dict)
+    for k, v in json_dict.items():
+      dictionary[k] = bunch.to_bunch(v)
+
+  if preprocessed_output:
+    with open(preprocessed_output, 'w') as dict_file:
+      pickle.dump(dictionary, dict_file)
+
+  cleared_dir = False
+  for arg in args:
+    got_input = True
+    with open(arg) as f:
+      srcs = list(yaml.load_all(f.read()))
+    for src in srcs:
+      if isinstance(src, basestring):
+        assert len(srcs) == 1
+        template = Template(src,
+                            filename=arg,
+                            module_directory=module_directory,
+                            lookup=TemplateLookup(directories=['.']))
+        with open(output_name, 'w') as output_file:
+          template.render_context(Context(output_file, **dictionary))
+      else:
+        # we have optional control data: this template represents
+        # a directory
+        if not cleared_dir:
+          if not os.path.exists(output_name):
+            pass
+          elif os.path.isfile(output_name):
+            os.unlink(output_name)
+          else:
+            shutil.rmtree(output_name, ignore_errors=True)
+          cleared_dir = True
+        items = []
+        if 'foreach' in src:
+          for el in dictionary[src['foreach']]:
+            if 'cond' in src:
+              args = dict(dictionary)
+              args['selected'] = el
+              if not eval(src['cond'], {}, args):
+                continue
+            items.append(el)
+          assert items
+        else:
+          items = [None]
+        for item in items:
+          args = dict(dictionary)
+          args['selected'] = item
+          item_output_name = os.path.join(
+              output_name, Template(src['output_name']).render(**args))
+          if not os.path.exists(os.path.dirname(item_output_name)):
+            os.makedirs(os.path.dirname(item_output_name))
+          template = Template(src['template'],
+                              filename=arg,
+                              module_directory=module_directory,
+                              lookup=TemplateLookup(directories=['.']))
+          with open(item_output_name, 'w') as output_file:
+            template.render_context(Context(output_file, **args))
+
+  if not got_input and not preprocessed_output:
+    out('Got nothing to do')
+    showhelp()
+
+if __name__ == '__main__':
+  main(sys.argv[1:])