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// Copyright 2021 The Pigweed Authors
//
// 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
//
// https://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 {ProtoCollection} from 'pigweedjs/pw_protobuf_compiler';
import {
MethodDescriptorProto,
ServiceDescriptorProto,
} from 'google-protobuf/google/protobuf/descriptor_pb';
import {hash} from './hash';
interface ChannelOutput {
(data: Uint8Array): void;
}
export class Channel {
readonly id: number;
private output: ChannelOutput;
constructor(id: number, output: ChannelOutput = () => {}) {
this.id = id;
this.output = output;
}
send(data: Uint8Array) {
this.output(data);
}
}
/** Describes an RPC service. */
export class Service {
readonly name: string;
readonly id: number;
readonly methods = new Map<number, Method>();
readonly methodsByName = new Map<string, Method>();
constructor(
descriptor: ServiceDescriptorProto,
protoCollection: ProtoCollection,
packageName: string
) {
this.name = packageName + '.' + descriptor.getName()!;
this.id = hash(this.name);
descriptor
.getMethodList()
.forEach((methodDescriptor: MethodDescriptorProto) => {
const method = new Method(methodDescriptor, protoCollection, this);
this.methods.set(method.id, method);
this.methodsByName.set(method.name, method);
});
}
}
export enum MethodType {
UNARY,
SERVER_STREAMING,
CLIENT_STREAMING,
BIDIRECTIONAL_STREAMING,
}
/** Describes an RPC method. */
export class Method {
readonly service: Service;
readonly name: string;
readonly id: number;
readonly clientStreaming: boolean;
readonly serverStreaming: boolean;
readonly requestType: any;
readonly responseType: any;
readonly descriptor: MethodDescriptorProto;
constructor(
descriptor: MethodDescriptorProto,
protoCollection: ProtoCollection,
service: Service
) {
this.name = descriptor.getName()!;
this.id = hash(this.name);
this.service = service;
this.descriptor = descriptor;
this.serverStreaming = descriptor.getServerStreaming()!;
this.clientStreaming = descriptor.getClientStreaming()!;
const requestTypePath = descriptor.getInputType()!;
const responseTypePath = descriptor.getOutputType()!;
// Remove leading period if it exists.
this.requestType = protoCollection.getMessageCreator(
requestTypePath.replace(/^\./, '')
)!;
this.responseType = protoCollection.getMessageCreator(
responseTypePath.replace(/^\./, '')
)!;
}
get type(): MethodType {
if (this.clientStreaming && this.serverStreaming) {
return MethodType.BIDIRECTIONAL_STREAMING;
} else if (this.clientStreaming && !this.serverStreaming) {
return MethodType.CLIENT_STREAMING;
} else if (!this.clientStreaming && this.serverStreaming) {
return MethodType.SERVER_STREAMING;
} else if (!this.clientStreaming && !this.serverStreaming) {
return MethodType.UNARY;
}
throw Error('Unhandled streaming condition');
}
}
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