gistfile1.txt

#!/bin/env python3

import yaml
import sys
import argparse
import re
swagger = yaml.load(sys.stdin.read(), Loader=yaml.SafeLoader)

http_api_spec = {
    'apiVersion': 'config.istio.io/v1alpha2',
    'kind': 'HTTPAPISpec',
    'metadata': {
        'name': '{{ .Chart.Name }}',
        'labels': {}},
    'spec': {
        'attributes': {'attributes': {
            'api.service': {
                'stringValue': '{{ .Chart.Name }}'},
            'api.version': {
                'stringValue': swagger["info"]["version"]}}},
        'patterns': [{
                'attributes': {'attributes': {
                    'api.operation': {'stringValue': f"{m.upper()} {s}"}}},
                'httpMethod': m.upper(),
                'uriTemplate': s,
             }
             for (s, k) in [(re.sub('/:([a-zA-Z0-9_]+)', '/{\\1}', k), k)
                            for k in swagger["paths"].keys()]
             for m in swagger["paths"][k].keys()]}}

http_api_spec_binding = {
    'apiVersion': 'config.istio.io/v1alpha2',
    'kind': 'HTTPAPISpecBinding',
    'metadata': {
        'name': '{{ .Chart.Name }}',
        'labels': {}},
    'spec': {}}

parser = argparse.ArgumentParser(description='Generate http api spec')
parser.add_argument('-a --all', action='store_true',
                    help='generatre all', dest="gen_all")
parser.add_argument('-b --binding', action='store_true',
                    help='generatre binding', dest="binding")
parser.add_argument('-n --name', help='service name', dest="name")
parser.add_argument('-v --version', help='service version', dest="version")
args = parser.parse_args()

if args.name:
    http_api_spec['metadata']['name'] = args.name
    http_api_spec['spec']['attributes']['attributes']['api.service']['stringValue'] = args.name

    http_api_spec_binding['metadata']['name'] = args.name

    http_api_spec_binding['spec'] = {
        'services': [{
            'name': args.name,
            'namespace': 'default'
        }],
        'api_specs': [{
            'name': args.name,
            'namespace': 'default'
        }]}
else:
    http_api_spec['metadata']['labels']['app'] = "{{ .Chart.Name }}"
    http_api_spec['metadata']['labels']['version'] = \
        "{{ .Values.deploymentVersion }}"

    http_api_spec_binding['metadata']['labels']['app'] = "{{ .Chart.Name }}"
    http_api_spec_binding['metadata']['labels']['version'] = \
        "{{ .Values.deploymentVersion }}"

    http_api_spec_binding['spec'] = {
        'services': [{
            'name': '{{ .Chart.Name }}',
            'namespace': 'default'
        }],
        'api_specs': [{
            'name': '{{ .Chart.Name }}',
            'namespace': 'default'
        }]}

if args.version and args.name:
    http_api_spec['metadata']['labels']['app'] = args.name 
    http_api_spec['metadata']['labels']['version'] = args.version

    http_api_spec_binding['metadata']['labels']['app'] = args.name 
    http_api_spec_binding['metadata']['labels']['version'] = args.version

if not args.binding or args.gen_all:
    print(yaml.dump(http_api_spec))

if args.gen_all:
    print("---")

if args.binding or args.gen_all:
    print(yaml.dump(http_api_spec_binding))