Mercurial > lbo > hg > async-google-apis
view generate/generate.py @ 13:5694ea390f8e
Also support 'any' type
author | Lewin Bormann <lbo@spheniscida.de> |
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date | Sat, 17 Oct 2020 17:37:19 +0200 |
parents | 2a5c8f471c11 |
children | ca993cdce94d |
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#!/usr/bin/env python3 import argparse import chevron import json import re import requests from os import path from templates import * def optionalize(name, optional=True): return 'Option<{}>'.format(name) if optional else name def replace_keywords(name): return { 'type': ('typ', 'type'), }.get(name, name) def capitalize_first(name): return name[0].upper() + name[1:] def snake_case(name): def r(c): if c.islower(): return c return '_' + c.lower() return ''.join([r(c) for c in name]) def type_of_property(name, prop, optional=True): """Translate a JSON schema type into Rust types. Arguments: name: Name of the property. If the property is an object with fixed fields, generate a struct with this name. prop: A JSON object from a discovery document representing a type. Returns: type (string|tuple), structs (list of dicts) where type is a string representing a Rust type, or a tuple where the first element is a Rust type and the second element is a comment detailing the use of the field. The list of dicts returned as structs are any structs that need to be separately implemented and that the generated struct (if it was a struct) depends on. """ typ = '' comment = '' structs = [] try: if '$ref' in prop: return optionalize(prop['$ref'], optional), structs if 'type' in prop and prop['type'] == 'object': if 'properties' in prop: typ = name struct = {'name': name, 'fields': []} for pn, pp in prop['properties'].items(): subtyp, substructs = type_of_property(name + capitalize_first(pn), pp, optional=True) if type(subtyp) is tuple: subtyp, comment = subtyp else: comment = None cleaned_pn = replace_keywords(pn) if type(cleaned_pn) is tuple: jsonname = cleaned_pn[1] cleaned_pn = snake_case(cleaned_pn[0]) else: jsonname = pn cleaned_pn = snake_case(cleaned_pn) struct['fields'].append({ 'name': cleaned_pn, 'attr': '#[serde(rename = "{}")]'.format(jsonname) + '\n #[serde(skip_serializing_if = "Option::is_none")]' if subtyp.startswith('Option') else '', 'typ': subtyp, 'comment': comment }) structs.extend(substructs) structs.append(struct) return (optionalize(typ, optional), prop.get('description', '')), structs if 'additionalProperties' in prop: field, substructs = type_of_property(name, prop['additionalProperties'], optional=False) structs.extend(substructs) if type(field) is tuple: typ = field[0] else: typ = field return (optionalize('HashMap<String,' + typ + '>', optional), prop.get('description', '')), structs if prop['type'] == 'array': typ, substructs = type_of_property(name, prop['items'], optional=False) if type(typ) is tuple: typ = typ[0] return (optionalize('Vec<' + typ + '>', optional), prop.get('description', '')), structs + substructs if prop['type'] == 'string': if 'format' in prop: if prop['format'] == 'int64': return (optionalize('String', optional), 'i64: ' + prop.get('description', '')), structs if prop['format'] == 'int32': return (optionalize('String', optional), 'i32: ' + prop.get('description', '')), structs if prop['format'] == 'double': return (optionalize('String', optional), 'f64: ' + prop.get('description', '')), structs if prop['format'] == 'float': return (optionalize('String', optional), 'f32: ' + prop.get('description', '')), structs if prop['format'] == 'date-time': return (optionalize('DateTime<Utc>', optional), prop.get('description', '')), structs return (optionalize('String', optional), prop.get('description', '')), structs if prop['type'] == 'boolean': return (optionalize('bool', optional), prop.get('description', '')), structs if prop['type'] in ('number', 'integer'): if prop['format'] == 'float': return (optionalize('f32', optional), prop.get('description', '')), structs if prop['format'] == 'double': return (optionalize('f64', optional), prop.get('description', '')), structs if prop['format'] == 'int32': return (optionalize('i32', optional), prop.get('description', '')), structs if prop['format'] == 'int64': return (optionalize('i64', optional), prop.get('description', '')), structs if prop['type'] == 'any': return (optionalize('String', optional), 'ANY data: ' + prop.get('description', '')), structs raise Exception('unimplemented!', name, prop) except KeyError as e: print(name, prop) print(e) raise e def scalar_type(jsont): """Translate a scalar json type (for parameters) into Rust.""" if jsont == 'boolean': return 'bool' elif jsont == 'string': return 'String' elif jsont == 'integer': return 'i64' raise Exception('unknown scalar type:', jsont) def generate_parameter_types(resources): """Generate parameter structs from the resources list. Returns a list of source code strings. """ structs = [] for resourcename, resource in resources.items(): for methodname, method in resource['methods'].items(): print("processed:", resourcename, methodname) struct = {'name': capitalize_first(resourcename) + capitalize_first(methodname) + 'Params', 'fields': []} if 'parameters' in method: for paramname, param in method['parameters'].items(): struct['fields'].append({ 'name': snake_case(paramname), 'typ': optionalize(scalar_type(param['type']), not param.get('required', False)), 'comment': param.get('description', ''), 'attr': '#[serde(rename = "{}")]'.format(paramname), }) structs.append(struct) return [chevron.render(ResourceStructTmpl, s) for s in structs] def resolve_parameters(string, paramsname='params', suffix=''): """Returns a Rust syntax for formatting the given string with API parameters, and a list of (snake-case) API parameters that are used. """ pat = re.compile('\{(\w+)\}') params = re.findall(pat, string) snakeparams = [snake_case(p) for p in params] format_params = ','.join(['{}={}.{}{}'.format(p, paramsname, sp, suffix) for (p, sp) in zip(params, snakeparams)]) return 'format!("{}", {})'.format(string, format_params), snakeparams def generate_service(resource, methods, discdoc): """Generate the code for all methods in a resource. Returns a rendered string with source code. """ service = capitalize_first(resource) parts = [] method_fragments = [] # Generate individual methods. for methodname, method in methods['methods'].items(): params_name = service + capitalize_first(methodname) + 'Params' parameters = {p: snake_case(p) for p, pp in method.get('parameters', {}).items() if 'required' not in pp} in_type = method['request']['$ref'] if 'request' in method else '()' out_type = method['response']['$ref'] if 'response' in method else '()' is_upload = 'mediaUpload' in method media_upload = method.get('mediaUpload', None) if media_upload and 'simple' in media_upload['protocols']: upload_path = media_upload['protocols']['simple']['path'] else: upload_path = '' http_method = method['httpMethod'] formatted_path, required_params = resolve_parameters(method['path']) data_normal = { 'name': methodname, 'param_type': params_name, 'in_type': in_type, 'out_type': out_type, 'base_path': discdoc['baseUrl'], 'rel_path_expr': formatted_path, 'params': [{ 'param': p, 'snake_param': sp } for (p, sp) in parameters.items()], 'http_method': http_method } method_fragments.append(chevron.render(NormalMethodTmpl, data_normal)) if is_upload: data_upload = { 'name': snake_case(methodname), 'param_type': params_name, 'in_type': in_type, 'out_type': out_type, 'base_path': discdoc['rootUrl'], 'rel_path_expr': '"' + upload_path.lstrip('/') + '"', 'params': [{ 'param': p, 'snake_param': sp } for (p, sp) in parameters.items()], 'http_method': http_method } method_fragments.append(chevron.render(UploadMethodTmpl, data_upload)) return chevron.render(ServiceImplementationTmpl, { 'service': service, 'methods': [{ 'text': t } for t in method_fragments] }) def generate_structs(discdoc): schemas = discdoc['schemas'] resources = discdoc['resources'] structs = [] services = [] # Generate parameter types. parameter_types = generate_parameter_types(resources) for resource, methods in resources.items(): services.append(generate_service(resource, methods, discdoc)) for name, desc in schemas.items(): typ, substructs = type_of_property(name, desc) structs.extend(substructs) modname = (discdoc['id'] + '_types').replace(':', '_') with open(path.join('gen', modname + '.rs'), 'w') as f: f.write(RustHeader) for s in structs: for field in s['fields']: if field.get('comment', None): field['comment'] = field['comment'].replace('\n', ' ') f.write(chevron.render(ResourceStructTmpl, s)) for pt in parameter_types: f.write(pt) for s in services: f.write(s) def fetch_discovery_base(url, apis): '''Fetch the discovery base document from `url`. Return api documents for APIs with IDs in `apis`. Returns: List of API JSON documents. ''' doc = json.loads(requests.get(url).text) return [it for it in doc['items'] if it['id'] in apis] def fetch_discovery_doc(api_doc): url = api_doc['discoveryRestUrl'] return json.loads(requests.get(url).text) def main(): p = argparse.ArgumentParser(description='Generate Rust code for asynchronous REST Google APIs.') p.add_argument('--discovery_base', default='https://www.googleapis.com/discovery/v1/apis', help='Base Discovery document.') p.add_argument('--only_apis', default='drive:v3', help='Only process APIs with these IDs (comma-separated)') args = p.parse_args() docs = fetch_discovery_base(args.discovery_base, args.only_apis) for doc in docs: discdoc = fetch_discovery_doc(doc) generate_structs(discdoc) if __name__ == '__main__': main()