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// Copyright 2022 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 objectPath from 'object-path';
import {Decoder, Encoder} from 'pigweedjs/pw_hdlc';
import {
Client,
Channel,
ServiceClient,
UnaryMethodStub,
MethodStub,
ServerStreamingMethodStub
} from 'pigweedjs/pw_rpc';
import {WebSerialTransport} from '../transport/web_serial_transport';
import {ProtoCollection} from 'pigweedjs/pw_protobuf_compiler';
function protoFieldToMethodName(string) {
return string.split("_").map(titleCase).join("");
}
function titleCase(string) {
return string.charAt(0).toUpperCase() + string.slice(1);
}
export class Device {
private protoCollection: ProtoCollection;
private transport: WebSerialTransport;
private decoder: Decoder;
private encoder: Encoder;
private rpcAddress: number;
private nameToMethodArgumentsMap: any;
client: Client;
rpcs: any
constructor(
protoCollection: ProtoCollection,
transport: WebSerialTransport = new WebSerialTransport(),
rpcAddress: number = 82) {
this.transport = transport;
this.rpcAddress = rpcAddress;
this.protoCollection = protoCollection;
this.decoder = new Decoder();
this.encoder = new Encoder();
this.nameToMethodArgumentsMap = {};
const channels = [
new Channel(1, (bytes) => {
const hdlcBytes = this.encoder.uiFrame(this.rpcAddress, bytes);
this.transport.sendChunk(hdlcBytes);
})];
this.client =
Client.fromProtoSet(channels, this.protoCollection);
this.setupRpcs();
}
async connect() {
await this.transport.connect();
this.transport.chunks.subscribe((item) => {
const decoded = this.decoder.process(item);
for (const frame of decoded) {
if (frame.address === this.rpcAddress) {
this.client.processPacket(frame.data);
}
}
});
}
getMethodArguments(fullPath) {
return this.nameToMethodArgumentsMap[fullPath];
}
private setupRpcs() {
let rpcMap = {};
let channel = this.client.channel();
let servicesKeys = Array.from(channel.services.keys());
servicesKeys.forEach((serviceKey) => {
objectPath.set(rpcMap, serviceKey,
this.mapServiceMethods(channel.services.get(serviceKey))
);
});
this.rpcs = rpcMap;
}
private mapServiceMethods(service: ServiceClient) {
let methodMap = {};
let methodKeys = Array.from(service.methodsByName.keys());
methodKeys
.filter((method: any) =>
service.methodsByName.get(method) instanceof UnaryMethodStub
|| service.methodsByName.get(method) instanceof ServerStreamingMethodStub)
.forEach(key => {
let fn = this.createMethodWrapper(
service.methodsByName.get(key),
key,
`${service.name}.${key}`
);
methodMap[key] = fn;
});
return methodMap;
}
private createMethodWrapper(
realMethod: MethodStub,
methodName: string,
fullMethodPath: string) {
if (realMethod instanceof UnaryMethodStub) {
return this.createUnaryMethodWrapper(
realMethod,
methodName,
fullMethodPath);
}
else if (realMethod instanceof ServerStreamingMethodStub) {
return this.createServerStreamingMethodWrapper(
realMethod,
methodName,
fullMethodPath);
}
}
private createUnaryMethodWrapper(
realMethod: UnaryMethodStub,
methodName: string,
fullMethodPath: string) {
const requestType =
realMethod.method.descriptor.getInputType().replace(/^\./, '');
const requestProtoDescriptor =
this.protoCollection.getDescriptorProto(requestType);
const requestFields = requestProtoDescriptor.getFieldList();
const functionArguments = requestFields
.map(field => field.getName())
.concat(
'return this(arguments);'
);
// We store field names so REPL can show hints in autocomplete using these.
this.nameToMethodArgumentsMap[fullMethodPath] = requestFields
.map(field => field.getName());
// We create a new JS function dynamically here that takes
// proto message fields as arguments and calls the actual RPC method.
let fn = new Function(...functionArguments).bind((args) => {
const request = new realMethod.method.requestType();
requestFields.forEach((field, index) => {
request[`set${titleCase(field.getName())}`](args[index]);
})
return realMethod.call(request);
});
return fn;
}
private createServerStreamingMethodWrapper(
realMethod: ServerStreamingMethodStub,
methodName: string,
fullMethodPath: string) {
const requestType = realMethod.method.descriptor.getInputType().replace(/^\./, '');
const requestProtoDescriptor =
this.protoCollection.getDescriptorProto(requestType);
const requestFields = requestProtoDescriptor.getFieldList();
const functionArguments = requestFields
.map(field => field.getName())
.concat(
[
'onNext',
'onComplete',
'onError',
'return this(arguments);'
]
);
// We store field names so REPL can show hints in autocomplete using these.
this.nameToMethodArgumentsMap[fullMethodPath] = requestFields
.map(field => field.getName());
// We create a new JS function dynamically here that takes
// proto message fields as arguments and calls the actual RPC method.
let fn = new Function(...functionArguments).bind((args) => {
const request = new realMethod.method.requestType();
requestFields.forEach((field, index) => {
request[`set${protoFieldToMethodName(field.getName())}`](args[index]);
})
const callbacks = Array.from(args).slice(requestFields.length);
// @ts-ignore
return realMethod.invoke(request, callbacks[0], callbacks[1], callbacks[2]);
});
return fn;
}
}
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