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# 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 collections
import hashlib
from cliff.formatters import base
class ResourceDotInfo(object):
def __init__(self, res):
self.resource = res
links = {l['rel']: l['href'] for l in res.links}
self.nested_dot_id = self.dot_id(links.get('nested'), 'stack')
self.stack_dot_id = self.dot_id(links.get('stack'), 'stack')
self.res_dot_id = self.dot_id(links.get('self'))
@staticmethod
def dot_id(url, prefix=None):
"""Build an id with a prefix and a truncated hash of the URL"""
if not url:
return None
if not prefix:
prefix = 'r'
hash_object = hashlib.sha256(url.encode('utf-8'))
return '%s_%s' % (prefix, hash_object.hexdigest()[:20])
class ResourceDotFormatter(base.ListFormatter):
def add_argument_group(self, parser):
pass
def emit_list(self, column_names, data, stdout, parsed_args):
writer = ResourceDotWriter(data, stdout)
writer.write()
class ResourceDotWriter(object):
def __init__(self, data, stdout):
self.resources_by_stack = collections.defaultdict(
collections.OrderedDict)
self.resources_by_dot_id = collections.OrderedDict()
self.nested_stack_ids = []
self.stdout = stdout
for r in data:
rinfo = ResourceDotInfo(r)
if rinfo.stack_dot_id:
self.resources_by_stack[
rinfo.stack_dot_id][r.resource_name] = rinfo
if rinfo.res_dot_id:
self.resources_by_dot_id[rinfo.res_dot_id] = rinfo
if rinfo.nested_dot_id:
self.nested_stack_ids.append(rinfo.nested_dot_id)
def write(self):
stdout = self.stdout
stdout.write('digraph G {\n')
stdout.write(' graph [\n'
' fontsize=10 fontname="Verdana" '
'compound=true rankdir=LR\n'
' ]\n')
self.write_root_nodes()
self.write_subgraphs()
self.write_nested_stack_edges()
self.write_required_by_edges()
stdout.write('}\n')
def write_root_nodes(self):
for stack_dot_id in set(self.resources_by_stack.keys()).difference(
self.nested_stack_ids):
resources = self.resources_by_stack[stack_dot_id]
self.write_nodes(resources, 2)
def write_subgraphs(self):
for dot_id, rinfo in self.resources_by_dot_id.items():
if rinfo.nested_dot_id:
resources = self.resources_by_stack[rinfo.nested_dot_id]
if resources:
self.write_subgraph(resources, rinfo)
def write_nodes(self, resources, indent):
stdout = self.stdout
spaces = ' ' * indent
for rinfo in resources.values():
r = rinfo.resource
dot_id = rinfo.res_dot_id
if r.resource_status.endswith('FAILED'):
style = 'style=filled color=red'
else:
style = ''
stdout.write('%s%s [label="%s\n%s" %s];\n'
% (spaces, dot_id, r.resource_name,
r.resource_type, style))
stdout.write('\n')
def write_subgraph(self, resources, nested_resource):
stdout = self.stdout
stack_dot_id = nested_resource.nested_dot_id
nested_name = nested_resource.resource.resource_name
stdout.write(' subgraph cluster_%s {\n' % stack_dot_id)
stdout.write(' label="%s";\n' % nested_name)
self.write_nodes(resources, 4)
stdout.write(' }\n\n')
def write_required_by_edges(self):
stdout = self.stdout
for dot_id, rinfo in self.resources_by_dot_id.items():
r = rinfo.resource
required_by = r.required_by
stack_dot_id = rinfo.stack_dot_id
if not required_by or not stack_dot_id:
continue
stack_resources = self.resources_by_stack.get(stack_dot_id, {})
for req in required_by:
other_rinfo = stack_resources.get(req)
if other_rinfo:
stdout.write(' %s -> %s;\n'
% (rinfo.res_dot_id, other_rinfo.res_dot_id))
stdout.write('\n')
def write_nested_stack_edges(self):
stdout = self.stdout
for dot_id, rinfo in self.resources_by_dot_id.items():
if rinfo.nested_dot_id:
nested_resources = self.resources_by_stack[rinfo.nested_dot_id]
if nested_resources:
first_resource = list(nested_resources.values())[0]
stdout.write(
' %s -> %s [\n color=dimgray lhead=cluster_%s '
'arrowhead=none\n ];\n'
% (dot_id, first_resource.res_dot_id,
rinfo.nested_dot_id))
stdout.write('\n')
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