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kondunite.py
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kondunite.py
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import glob
from collections import defaultdict
from io import StringIO
from pathlib import Path
import click
import ruamel.yaml
from toposort import toposort_flatten
yaml = ruamel.yaml.YAML()
yaml.indent(mapping=2, sequence=4, offset=2)
yaml.width = 4096 # or some other big enough value to prevent line-wrap
allowed_low_level_nodes = ['replicas']
def fix_replica_templates(manifest):
"""
Remove quotes from `replicas` value (allow templating in replicas)
"""
fixed_manifest = []
for s in manifest.split('\n'):
fixed_line = s
if 'replicas:' in s:
key, val = s.split(':')
fixed_line = "{}:{}".format(key, val.replace('"', '').replace("'", ''))
fixed_manifest.append(fixed_line)
return "\n".join(fixed_manifest)
def is_allowed_node(node_name):
return '-' not in node_name or node_name.split('-')[0] in allowed_low_level_nodes
def yaml_contents(path):
with open(path, 'r') as f:
content = f.read()
resources = content.split('---')
for resource in resources:
resource = resource.strip()
resource_content = yaml.load(StringIO(resource))
yield resource_content
def iterate_yaml_tree(node, callback):
for name, sub_node in node.copy().items():
callback(node, name, sub_node)
if isinstance(sub_node, dict):
iterate_yaml_tree(sub_node, callback)
elif isinstance(sub_node, list):
for item in sub_node:
if isinstance(item, dict):
iterate_yaml_tree(item, callback)
def modify_targeted_nodes(node, target):
def callback(parent, node_name, node_content):
if not isinstance(node_content, dict) and not isinstance(node_content, list):
if not is_allowed_node(node_name):
# we don't support this feature on low levels nodes
return
if '-' in node_name:
node_target = node_name.split('-')[-1]
del parent[node_name]
if node_target == target:
parent['-'.join(node_name.split('-')[:-1])] = node_content
iterate_yaml_tree(node, callback)
def collect_and_set_images(node, tags_by_image):
collected_images = set()
def callback(parent, node_name, node_content):
if node_name == 'image':
image_name = node_content.split(":")[0]
if image_name in tags_by_image:
parent[node_name] = f"{image_name}:{tags_by_image[image_name]}"
collected_images.add(parent[node_name])
iterate_yaml_tree(node, callback)
return collected_images
def build_repl_images_section(collected_images, repl_registries):
result = "\nimages:\n"
for image in collected_images:
image_parts = image.split(":")
image_name = image_parts[0]
tag = image_parts[1] if len(image_parts) > 1 else "latest"
source = "public"
name = image_name
for registry in repl_registries:
if image_name.startswith(registry):
endpoint = registry.split("/")[0]
source = registry.split("/")[1]
name = image_name.split(f"{endpoint}/")[1]
break
result = f"{result}\n - name: {name}\n source: {source}\n tag: \"{tag}\"\n"
return result
@click.command()
@click.option('--no-recurse', is_flag=True, required=False, help="Do not recurse manifests directory", default=False)
@click.option('--target', '-t', required=True, help="Conditional target for unification", type=str)
@click.option('--img', '-i', multiple=True, required=False, help="One or more tag to specific images, provide values in the forms of 'image-name:tag', i.e gcr.io/company/server:1.0", type=str)
@click.option('--repl-base', '-b', required=False, help="Base replicated yaml definition (for '#kind: replicated' section), defaults to <directory>/replicated_base.yaml", type=str, default='')
@click.option('--output', '-o', required=False, help="File to write the unified yaml to, defaults to <target>.yaml", type=str, default='')
@click.option('--repl', '-r', is_flag=True, required=False, help="Plot output for a replicated release (with '# kind: scheduler-kubernetes' annotations)", default=False)
@click.option('--repl-registry', multiple=True, required=False, help="One or more docker registries defined in your Replicated settings in the form of endpoint:name, i.e gcr.io/company", type=str)
@click.argument('directory', type=str)
def cli(no_recurse, target, img, repl_base, output, repl, repl_registry, directory):
manifests_contents = defaultdict(list)
collected_images = set()
manifests_deps = defaultdict(set)
tags_by_image = {image.split(":")[0]: image.split(":")[1] for image in img}
is_repl = repl
repl_registries = repl_registry
if not output:
output = f"{target}.yaml"
if not repl_base:
repl_base = f"{directory}/replicated_base.yaml"
recursive = not no_recurse
manifests = glob.glob(f"{directory}/**/*.yaml" if recursive else f"{directory}/*.yaml", recursive=True)
for manifest_file in manifests:
if manifest_file == repl_base:
continue
print(f"Discovered file {manifest_file}")
filename = Path(manifest_file).name
manifests_deps[filename] # just to verify there is an entry for every filename
for manifest_content in yaml_contents(manifest_file):
if not manifest_content:
print(f"A manifest at {manifest_file} is an invalid yaml. Skipping.")
continue
if 'targetsOnly' in manifest_content:
if manifest_content['targetsOnly'] != target:
continue
del manifest_content['targetsOnly']
if 'dependencies' in manifest_content:
for dependent_on in manifest_content['dependencies']:
manifests_deps[filename].add(dependent_on)
del manifest_content['dependencies']
if 'replKind' in manifest_content:
replKind = manifest_content['replKind']
del manifest_content['replKind']
else:
replKind = "scheduler-kubernetes"
modify_targeted_nodes(manifest_content, target)
for image in collect_and_set_images(manifest_content, tags_by_image):
collected_images.add(image)
stream = StringIO()
yaml.dump(manifest_content, stream)
manifests_contents[filename].append(f"---\n# kind: {replKind}\n")
manifests_contents[filename].append(fix_replica_templates(stream.getvalue()))
final_collection = []
print(manifests_deps)
for manifest_file in toposort_flatten(manifests_deps):
if manifest_file in manifests_contents:
for content in manifests_contents[manifest_file]:
final_collection.append(content.strip())
print(f"Writing output to {output}")
with(open(output, 'w')) as f:
if not is_repl:
f.write(f"\n".join(final_collection))
else:
with open(repl_base, 'r') as base_f:
f.write(base_f.read())
f.write(build_repl_images_section(collected_images, repl_registries))
final_collection = [""] + final_collection
f.write("\n".join(final_collection))
if __name__ == '__main__':
pass