118 lines
3.3 KiB
TypeScript
118 lines
3.3 KiB
TypeScript
// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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import {ProtoCollection} from '@pigweed/pw_protobuf_compiler';
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import {
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MethodDescriptorProto,
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ServiceDescriptorProto,
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} from 'google-protobuf/google/protobuf/descriptor_pb';
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import {hash} from './hash';
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interface ChannelOutput {
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(data: Uint8Array): void;
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}
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export class Channel {
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readonly id: number;
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private output: ChannelOutput;
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constructor(id: number, output: ChannelOutput = () => {}) {
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this.id = id;
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this.output = output;
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}
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send(data: Uint8Array) {
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this.output(data);
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}
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}
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/** Describes an RPC service. */
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export class Service {
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readonly name: string;
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readonly id: number;
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readonly methods = new Map<number, Method>();
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readonly methodsByName = new Map<string, Method>();
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constructor(
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descriptor: ServiceDescriptorProto,
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protoCollection: ProtoCollection,
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packageName: string
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) {
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this.name = packageName + '.' + descriptor.getName()!;
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this.id = hash(this.name);
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descriptor
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.getMethodList()
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.forEach((methodDescriptor: MethodDescriptorProto) => {
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const method = new Method(methodDescriptor, protoCollection, this);
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this.methods.set(method.id, method);
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this.methodsByName.set(method.name, method);
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});
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}
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}
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export enum MethodType {
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UNARY,
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SERVER_STREAMING,
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CLIENT_STREAMING,
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BIDIRECTIONAL_STREAMING,
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}
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/** Describes an RPC method. */
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export class Method {
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readonly service: Service;
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readonly name: string;
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readonly id: number;
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readonly clientStreaming: boolean;
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readonly serverStreaming: boolean;
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readonly requestType: any;
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readonly responseType: any;
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constructor(
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descriptor: MethodDescriptorProto,
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protoCollection: ProtoCollection,
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service: Service
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) {
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this.name = descriptor.getName()!;
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this.id = hash(this.name);
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this.service = service;
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this.serverStreaming = descriptor.getServerStreaming()!;
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this.clientStreaming = descriptor.getClientStreaming()!;
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const requestTypePath = descriptor.getInputType()!;
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const responseTypePath = descriptor.getOutputType()!;
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// Remove leading period if it exists.
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this.requestType = protoCollection.getMessageCreator(
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requestTypePath.replace(/^\./, '')
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)!;
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this.responseType = protoCollection.getMessageCreator(
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responseTypePath.replace(/^\./, '')
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)!;
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}
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get type(): MethodType {
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if (this.clientStreaming && this.serverStreaming) {
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return MethodType.BIDIRECTIONAL_STREAMING;
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} else if (this.clientStreaming && !this.serverStreaming) {
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return MethodType.CLIENT_STREAMING;
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} else if (!this.clientStreaming && this.serverStreaming) {
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return MethodType.SERVER_STREAMING;
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} else if (!this.clientStreaming && !this.serverStreaming) {
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return MethodType.UNARY;
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}
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throw Error('Unhandled streaming condition');
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}
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}
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