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import os
import sys
import yaml
import argparse
def _translate_role(role, master_role, slave_roles):
if not master_role:
return role
if role == master_role:
return role
if role not in slave_roles:
return role
return master_role
def translate_role(role, master_role, slave_roles):
r = _translate_role(role, master_role, slave_roles)
if not isinstance(r, basestring):
raise Exception('%s -> %r' % (role, r))
return r
def resolve_params(item, param, value):
if item == {'Ref': param}:
return value
if isinstance(item, dict):
copy_item = dict(item)
for k, v in iter(copy_item.items()):
item[k] = resolve_params(v, param, value)
elif isinstance(item, list):
copy_item = list(item)
new_item = []
for v in copy_item:
new_item.append(resolve_params(v, param, value))
item = new_item
return item
MERGABLE_TYPES = {'OS::Nova::Server':
{'image': 'image'},
'AWS::EC2::Instance':
{'image': 'ImageId'},
'AWS::AutoScaling::LaunchConfiguration':
{},
}
INCLUDED_TEMPLATE_DIR = os.getcwd()
def resolve_includes(template, params=None):
new_template = {}
if params is None:
params = {}
for key, value in iter(template.items()):
if key == '__include__':
new_params = dict(params) # do not propagate up the stack
if not isinstance(value, dict):
raise ValueError('__include__ must be a mapping')
if 'path' not in value:
raise ValueError('__include__ must have path')
if 'params' in value:
if not isinstance(value['params'], dict):
raise ValueError('__include__ params must be a mapping')
new_params.update(value['params'])
with open(value['path']) as include_file:
sub_template = yaml.safe_load(include_file.read())
if 'subkey' in value:
if ((not isinstance(value['subkey'], int)
and not isinstance(sub_template, dict))):
raise RuntimeError('subkey requires mapping root or'
' integer for list root')
sub_template = sub_template[value['subkey']]
for k, v in iter(new_params.items()):
sub_template = resolve_params(sub_template, k, v)
new_template.update(resolve_includes(sub_template))
else:
if isinstance(value, dict):
new_template[key] = resolve_includes(value)
else:
new_template[key] = value
return new_template
def main(argv=None):
if argv is None:
argv = sys.argv[1:]
parser = argparse.ArgumentParser()
parser.add_argument('templates', nargs='+')
parser.add_argument('--master-role', nargs='?',
help='Translate slave_roles to this')
parser.add_argument('--slave-roles', nargs='*',
help='Translate all of these to master_role')
parser.add_argument('--included-template-dir', nargs='?',
default=INCLUDED_TEMPLATE_DIR,
help='Path for resolving included templates')
args = parser.parse_args(argv)
templates = args.templates
merged_template = merge(templates, args.master_role, args.slave_roles,
args.included_template_dir)
sys.stdout.write(merged_template)
def merge(templates, master_role=None, slave_roles=None,
included_template_dir=INCLUDED_TEMPLATE_DIR):
errors = []
end_template={'HeatTemplateFormatVersion': '2012-12-12',
'Description': []}
resource_changes=[]
for template_path in templates:
template = yaml.safe_load(open(template_path))
# Resolve __include__ tags
template = resolve_includes(template)
end_template['Description'].append(template.get('Description',
template_path))
new_parameters = template.get('Parameters', {})
for p, pbody in sorted(new_parameters.items()):
if p in end_template.get('Parameters', {}):
if pbody != end_template['Parameters'][p]:
errors.append('Parameter %s from %s conflicts.' % (p,
template_path))
continue
if 'Parameters' not in end_template:
end_template['Parameters'] = {}
end_template['Parameters'][p] = pbody
new_outputs = template.get('Outputs', {})
for o, obody in sorted(new_outputs.items()):
if o in end_template.get('Outputs', {}):
if pbody != end_template['Outputs'][p]:
errors.append('Output %s from %s conflicts.' % (o,
template_path))
continue
if 'Outputs' not in end_template:
end_template['Outputs'] = {}
end_template['Outputs'][o] = obody
new_resources = template.get('Resources', {})
for r, rbody in sorted(new_resources.items()):
if rbody['Type'] in MERGABLE_TYPES:
if 'image' in MERGABLE_TYPES[rbody['Type']]:
image_key = MERGABLE_TYPES[rbody['Type']]['image']
# XXX Assuming ImageId is always a Ref
ikey_val = end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
del end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
role = rbody.get('Metadata', {}).get('OpenStack::Role', r)
role = translate_role(role, master_role, slave_roles)
if role != r:
resource_changes.append((r, role))
if role in end_template.get('Resources', {}):
new_metadata = rbody.get('Metadata', {})
for m, mbody in iter(new_metadata.items()):
if m in end_template['Resources'][role].get('Metadata', {}):
if m == 'OpenStack::ImageBuilder::Elements':
end_template['Resources'][role]['Metadata'][m].extend(mbody)
continue
if mbody != end_template['Resources'][role]['Metadata'][m]:
errors.append('Role %s metadata key %s conflicts.' %
(role, m))
continue
end_template['Resources'][role]['Metadata'][m] = mbody
continue
if 'Resources' not in end_template:
end_template['Resources'] = {}
end_template['Resources'][role] = rbody
if 'image' in MERGABLE_TYPES[rbody['Type']]:
ikey = '%sImage' % (role)
end_template['Resources'][role]['Properties'][image_key] = {'Ref': ikey}
end_template['Parameters'][ikey] = ikey_val
elif rbody['Type'] == 'FileInclude':
# we trust os.path.join to DTRT: if FileInclude path isn't
# absolute, join to included_template_dir (./)
with open(os.path.join(included_template_dir, rbody['Path'])) as rfile:
include_content = yaml.safe_load(rfile.read())
subkeys = rbody.get('SubKey','').split('.')
while len(subkeys) and subkeys[0]:
include_content = include_content[subkeys.pop(0)]
for replace_param, replace_value in iter(rbody.get('Parameters',
{}).items()):
include_content = resolve_params(include_content,
replace_param,
replace_value)
end_template['Resources'][r] = include_content
else:
if r in end_template.get('Resources', {}):
if rbody != end_template['Resources'][r]:
errors.append('Resource %s from %s conflicts' % (r,
template_path))
continue
if 'Resources' not in end_template:
end_template['Resources'] = {}
end_template['Resources'][r] = rbody
def fix_ref(item, old, new):
if isinstance(item, dict):
copy_item = dict(item)
for k, v in sorted(copy_item.items()):
if k == 'Ref' and v == old:
item[k] = new
continue
if k == 'DependsOn' and v == old:
item[k] = new
continue
if k == 'Fn::GetAtt' and isinstance(v, list) and v[0] == old:
new_list = list(v)
new_list[0] = new
item[k] = new_list
continue
if k == 'AllowedResources' and isinstance(v, list) and old in v:
while old in v:
pos = v.index(old)
v[pos] = new
continue
fix_ref(v, old, new)
elif isinstance(item, list):
copy_item = list(item)
for v in item:
fix_ref(v, old, new)
for change in resource_changes:
fix_ref(end_template, change[0], change[1])
if errors:
for e in errors:
sys.stderr.write("ERROR: %s\n" % e)
end_template['Description'] = ','.join(end_template['Description'])
return yaml.safe_dump(end_template, default_flow_style=False)
if __name__ == "__main__":
main()
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