ui/src/controller/adb_socket_controller.ts - third_party/perfetto - Git at Google

 // Copyright (C) 2019 The Android Open Source Project
 //
 // 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
 //
 //      http://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 * as protobuf from 'protobufjs/minimal';
 import {perfetto} from '../gen/protos';
 import {Adb, AdbStream} from './adb_interfaces';
 import {
   isReadBuffersResponse,
   ReadBuffersResponse
 } from './consumer_port_types';
 import {globals} from './globals';
 import {Consumer, RpcConsumerPort} from './record_controller_interfaces';

 enum State {
   DISCONNECTED,
   BINDING_IN_PROGRESS,
   BOUND,
 }

 // See wire_protocol.proto for more details.
 const WIRE_PROTOCOL_HEADER_SIZE = 4;
 const MAX_IPC_BUFFER_SIZE = 128 * 1024;

 const PROTO_LEN_DELIMITED_WIRE_TYPE = 2;
 const TRACE_PACKET_PROTO_ID = 1;
 const TRACE_PACKET_PROTO_TAG =
     (TRACE_PACKET_PROTO_ID << 3) | PROTO_LEN_DELIMITED_WIRE_TYPE;

 declare type Frame = perfetto.ipc.Frame;
 declare type IMethodInfo = perfetto.ipc.Frame.BindServiceReply.IMethodInfo;
 declare type ISlice = perfetto.protos.ReadBuffersResponse.ISlice;

 export class AdbSocketConsumerPort extends RpcConsumerPort {
   private state = State.DISCONNECTED;
   private adb: Adb;
   private socket?: AdbStream;
   private device: USBDevice|undefined = undefined;
   // Wire protocol request ID. After each request it is increased. It is needed
   // to keep track of the type of request, and parse the response correctly.
   private requestId = 1;

   // Buffers received wire protocol data.
   private incomingBuffer = new Uint8Array(MAX_IPC_BUFFER_SIZE);
   private incomingBufferLen = 0;
   private frameToParseLen = 0;

   private availableMethods: IMethodInfo[] = [];
   private serviceId = -1;

   private resolveBindingPromise!: VoidFunction;
   private requestMethods = new Map<number, string>();

   // Needed for ReadBufferResponse: all the trace packets are split into
   // several slices. |partialPacket| is the buffer for them. Once we receive a
   // slice with the flag |lastSliceForPacket|, a new packet is created.
   private partialPacket: ISlice[] = [];
   // Accumulates trace packets into a proto trace file..
   private traceProtoWriter = protobuf.Writer.create();

   constructor(adb: Adb, consumer: Consumer) {
     super(consumer);
     this.adb = adb;
   }

   async handleCommand(method: string, params: Uint8Array) {
     if (this.state === State.BINDING_IN_PROGRESS) return;
     if (this.state === State.DISCONNECTED) {
       this.state = State.BINDING_IN_PROGRESS;
       this.device = await this.findDevice();
       if (!this.device) {
         this.sendErrorMessage(`Device with serial ${
             globals.state.serialAndroidDeviceConnected} not found.`);
         return;
       }
       await this.adb.connect(this.device);
       await this.listenForMessages();
       await this.bind();
       this.traceProtoWriter = protobuf.Writer.create();
       this.state = State.BOUND;
     }

     console.assert(this.state === State.BOUND);
     this.invoke(method, params);
   }

   invoke(method: string, argsProto: Uint8Array) {
     const requestId = this.requestId++;
     const methodId = this.findMethodId(method);
     if (methodId === undefined) {
       this.sendErrorMessage('Calling unsupported method on target.');
       console.error(`Method ${method} not supported by the target`);
       return;
     }
     const frame = new perfetto.ipc.Frame({
       requestId,
       msgInvokeMethod: new perfetto.ipc.Frame.InvokeMethod(
           {serviceId: this.serviceId, methodId, argsProto})
     });
     this.requestMethods.set(requestId, method);
     this.sendFrame(frame);
   }

   async sendFrame(frame: Frame) {
     console.assert(this.socket !== undefined);
     if (!this.socket) return;
     const frameProto: Uint8Array = perfetto.ipc.Frame.encode(frame).finish();
     const frameLen = frameProto.length;
     const buf = new Uint8Array(WIRE_PROTOCOL_HEADER_SIZE + frameLen);
     const dv = new DataView(buf.buffer);
     dv.setUint32(0, frameProto.length, /* littleEndian */ true);
     for (let i = 0; i < frameLen; i++) {
       dv.setUint8(WIRE_PROTOCOL_HEADER_SIZE + i, frameProto[i]);
     }
     await this.socket.write(buf);
   }

   async listenForMessages() {
     this.socket = await this.adb.socket('/dev/socket/traced_consumer');
     this.socket.onData = (_str, newData) => this.handleReceivedData(newData);
     this.socket.onClose = () => this.state = State.DISCONNECTED;
   }

   private parseMessageSize(buffer: Uint8Array) {
     const dv = new DataView(buffer.buffer, buffer.byteOffset, buffer.length);
     return dv.getUint32(0, true);
   }

   private parseMessage(frameBuffer: Uint8Array) {
     const frame = perfetto.ipc.Frame.decode(frameBuffer);
     this.handleIncomingFrame(frame);
   }

   private incompleteSizeHeader() {
     if (!this.frameToParseLen) {
       console.assert(this.incomingBufferLen < WIRE_PROTOCOL_HEADER_SIZE);
       return true;
     }
     return false;
   }

   private canCompleteSizeHeader(newData: Uint8Array) {
     return newData.length + this.incomingBufferLen > WIRE_PROTOCOL_HEADER_SIZE;
   }

   private canParseFullMessage(newData: Uint8Array) {
     return this.frameToParseLen &&
         this.incomingBufferLen + newData.length >= this.frameToParseLen;
   }

   private appendToIncomingBuffer(array: Uint8Array) {
     this.incomingBuffer.set(array, this.incomingBufferLen);
     this.incomingBufferLen += array.length;
   }

   handleReceivedData(newData: Uint8Array) {
     if (this.incompleteSizeHeader() && this.canCompleteSizeHeader(newData)) {
       const newDataBytesToRead =
           WIRE_PROTOCOL_HEADER_SIZE - this.incomingBufferLen;
       // Add to the incoming buffer the remaining bytes to arrive at
       // WIRE_PROTOCOL_HEADER_SIZE
       this.appendToIncomingBuffer(newData.subarray(0, newDataBytesToRead));
       newData = newData.subarray(newDataBytesToRead);

       this.frameToParseLen = this.parseMessageSize(this.incomingBuffer);
       this.incomingBufferLen = 0;
     }

     // Parse all complete messages in incomingBuffer and newData.
     while (this.canParseFullMessage(newData)) {
       // All the message is in the newData buffer.
       if (this.incomingBufferLen === 0) {
         this.parseMessage(newData.subarray(0, this.frameToParseLen));
         newData = newData.subarray(this.frameToParseLen);
       } else {  // We need to complete the local buffer.
         // Read the remaining part of this message.
         const bytesToCompleteMessage =
             this.frameToParseLen - this.incomingBufferLen;
         this.appendToIncomingBuffer(
             newData.subarray(0, bytesToCompleteMessage));
         this.parseMessage(
             this.incomingBuffer.subarray(0, this.frameToParseLen));
         this.incomingBufferLen = 0;
         // Remove the data just parsed.
         newData = newData.subarray(bytesToCompleteMessage);
       }
       this.frameToParseLen = 0;
       if (!this.canCompleteSizeHeader(newData)) break;

       this.frameToParseLen =
           this.parseMessageSize(newData.subarray(0, WIRE_PROTOCOL_HEADER_SIZE));
       newData = newData.subarray(WIRE_PROTOCOL_HEADER_SIZE);
     }
     // Buffer the remaining data (part of the next header + message).
     this.appendToIncomingBuffer(newData);
   }

   decodeResponse(
       requestId: number, responseProto: Uint8Array, hasMore = false) {
     const method = this.requestMethods.get(requestId);
     if (!method) {
       console.error(`Unknown request id: ${requestId}`);
       this.sendErrorMessage(`Wire protocol error.`);
       return;
     }
     const decoder = decoders.get(method);
     if (decoder === undefined) {
       console.error(`Unable to decode method: ${method}`);
       return;
     }
     const decodedResponse = decoder(responseProto);
     const response = {type: `${method}Response`, ...decodedResponse};

     // TODO(nicomazz): Fix this.
     // We assemble all the trace and then send it back to the main controller.
     // This is a temporary solution, that will be changed in a following CL,
     // because now both the chrome consumer port and the other adb consumer port
     // send back the entire trace, while the correct behavior should be to send
     // back the slices, that are assembled by the main record controller.
     if (isReadBuffersResponse(response)) {
       if (response.slices) this.handleSlices(response.slices);
       if (!hasMore) this.sendReadBufferResponse();
       return;
     }
     this.sendMessage(response);
   }

   handleSlices(slices: ISlice[]) {
     for (const slice of slices) {
       this.partialPacket.push(slice);
       if (slice.lastSliceForPacket) {
         const tracePacket = this.generateTracePacket(this.partialPacket);
         this.traceProtoWriter.uint32(TRACE_PACKET_PROTO_TAG);
         this.traceProtoWriter.bytes(tracePacket);
         this.partialPacket = [];
       }
     }
   }

   generateTracePacket(slices: ISlice[]): Uint8Array {
     let bufferSize = 0;
     for (const slice of slices) bufferSize += slice.data!.length;
     const fullBuffer = new Uint8Array(bufferSize);
     let written = 0;
     for (const slice of slices) {
       const data = slice.data!;
       fullBuffer.set(data, written);
       written += data.length;
     }
     return fullBuffer;
   }

   sendReadBufferResponse() {
     const readBufferResponse: ReadBuffersResponse = {
       type: 'ReadBuffersResponse',
       slices: [{data: this.traceProtoWriter.finish(), lastSliceForPacket: true}]
     };

     this.sendMessage(readBufferResponse);
   }

   bind() {
     console.assert(this.socket !== undefined);
     const requestId = this.requestId++;
     const frame = new perfetto.ipc.Frame({
       requestId,
       msgBindService:
           new perfetto.ipc.Frame.BindService({serviceName: 'ConsumerPort'})
     });
     return new Promise((resolve, _) => {
       this.resolveBindingPromise = resolve;
       this.sendFrame(frame);
     });
   }

   findMethodId(method: string): number|undefined {
     const methodObject = this.availableMethods.find((m) => m.name === method);
     if (methodObject && methodObject.id) return methodObject.id;
     return undefined;
   }

   async findDevice() {
     if (!globals.state.androidDeviceConnected) return undefined;
     const targetSerial = globals.state.androidDeviceConnected.serial;
     const devices = await navigator.usb.getDevices();
     return devices.find(d => d.serialNumber === targetSerial);
   }

   handleIncomingFrame(frame: perfetto.ipc.Frame) {
     const requestId = frame.requestId as number;
     switch (frame.msg) {
       case 'msgBindServiceReply': {
         const msgBindServiceReply = frame.msgBindServiceReply;
         if (msgBindServiceReply && msgBindServiceReply.methods &&
             msgBindServiceReply.serviceId) {
           console.assert(msgBindServiceReply.success);
           this.availableMethods = msgBindServiceReply.methods;
           this.serviceId = msgBindServiceReply.serviceId;
           this.resolveBindingPromise();
           this.resolveBindingPromise = () => {};
         }
         return;
       }
       case 'msgInvokeMethodReply': {
         const msgInvokeMethodReply = frame.msgInvokeMethodReply;
         if (msgInvokeMethodReply && msgInvokeMethodReply.replyProto) {
           console.assert(msgInvokeMethodReply.success);
           this.decodeResponse(
               requestId,
               msgInvokeMethodReply.replyProto,
               msgInvokeMethodReply.hasMore === true);
         }
         return;
       }
       default:
         console.error(`not recognized frame message: ${frame.msg}`);
     }
   }
 }

 const decoders =
     new Map<string, Function>()
         .set('EnableTracing', perfetto.protos.EnableTracingResponse.decode)
         .set('FreeBuffers', perfetto.protos.FreeBuffersResponse.decode)
         .set('ReadBuffers', perfetto.protos.ReadBuffersResponse.decode)
         .set('DisableTracing', perfetto.protos.DisableTracingResponse.decode)
         .set('GetTraceStats', perfetto.protos.GetTraceStatsResponse.decode);
	// Copyright (C) 2019 The Android Open Source Project
	//
	// 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
	//
	// http://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 * as protobuf from 'protobufjs/minimal';
	import {perfetto} from '../gen/protos';
	import {Adb, AdbStream} from './adb_interfaces';
	import {
	isReadBuffersResponse,
	ReadBuffersResponse
	} from './consumer_port_types';
	import {globals} from './globals';
	import {Consumer, RpcConsumerPort} from './record_controller_interfaces';

	enum State {
	DISCONNECTED,
	BINDING_IN_PROGRESS,
	BOUND,
	}

	// See wire_protocol.proto for more details.
	const WIRE_PROTOCOL_HEADER_SIZE = 4;
	const MAX_IPC_BUFFER_SIZE = 128 * 1024;

	const PROTO_LEN_DELIMITED_WIRE_TYPE = 2;
	const TRACE_PACKET_PROTO_ID = 1;
	const TRACE_PACKET_PROTO_TAG =
	(TRACE_PACKET_PROTO_ID << 3) \| PROTO_LEN_DELIMITED_WIRE_TYPE;

	declare type Frame = perfetto.ipc.Frame;
	declare type IMethodInfo = perfetto.ipc.Frame.BindServiceReply.IMethodInfo;
	declare type ISlice = perfetto.protos.ReadBuffersResponse.ISlice;

	export class AdbSocketConsumerPort extends RpcConsumerPort {
	private state = State.DISCONNECTED;
	private adb: Adb;
	private socket?: AdbStream;
	private device: USBDevice\|undefined = undefined;
	// Wire protocol request ID. After each request it is increased. It is needed
	// to keep track of the type of request, and parse the response correctly.
	private requestId = 1;

	// Buffers received wire protocol data.
	private incomingBuffer = new Uint8Array(MAX_IPC_BUFFER_SIZE);
	private incomingBufferLen = 0;
	private frameToParseLen = 0;

	private availableMethods: IMethodInfo[] = [];
	private serviceId = -1;

	private resolveBindingPromise!: VoidFunction;
	private requestMethods = new Map<number, string>();

	// Needed for ReadBufferResponse: all the trace packets are split into
	// several slices. \|partialPacket\| is the buffer for them. Once we receive a
	// slice with the flag \|lastSliceForPacket\|, a new packet is created.
	private partialPacket: ISlice[] = [];
	// Accumulates trace packets into a proto trace file..
	private traceProtoWriter = protobuf.Writer.create();

	constructor(adb: Adb, consumer: Consumer) {
	super(consumer);
	this.adb = adb;
	}

	async handleCommand(method: string, params: Uint8Array) {
	if (this.state === State.BINDING_IN_PROGRESS) return;
	if (this.state === State.DISCONNECTED) {
	this.state = State.BINDING_IN_PROGRESS;
	this.device = await this.findDevice();
	if (!this.device) {
	this.sendErrorMessage(`Device with serial ${
	globals.state.serialAndroidDeviceConnected} not found.`);
	return;
	}
	await this.adb.connect(this.device);
	await this.listenForMessages();
	await this.bind();
	this.traceProtoWriter = protobuf.Writer.create();
	this.state = State.BOUND;
	}

	console.assert(this.state === State.BOUND);
	this.invoke(method, params);
	}

	invoke(method: string, argsProto: Uint8Array) {
	const requestId = this.requestId++;
	const methodId = this.findMethodId(method);
	if (methodId === undefined) {
	this.sendErrorMessage('Calling unsupported method on target.');
	console.error(`Method ${method} not supported by the target`);
	return;
	}
	const frame = new perfetto.ipc.Frame({
	requestId,
	msgInvokeMethod: new perfetto.ipc.Frame.InvokeMethod(
	{serviceId: this.serviceId, methodId, argsProto})
	});
	this.requestMethods.set(requestId, method);
	this.sendFrame(frame);
	}

	async sendFrame(frame: Frame) {
	console.assert(this.socket !== undefined);
	if (!this.socket) return;
	const frameProto: Uint8Array = perfetto.ipc.Frame.encode(frame).finish();
	const frameLen = frameProto.length;
	const buf = new Uint8Array(WIRE_PROTOCOL_HEADER_SIZE + frameLen);
	const dv = new DataView(buf.buffer);
	dv.setUint32(0, frameProto.length, /* littleEndian */ true);
	for (let i = 0; i < frameLen; i++) {
	dv.setUint8(WIRE_PROTOCOL_HEADER_SIZE + i, frameProto[i]);
	}
	await this.socket.write(buf);
	}

	async listenForMessages() {
	this.socket = await this.adb.socket('/dev/socket/traced_consumer');
	this.socket.onData = (_str, newData) => this.handleReceivedData(newData);
	this.socket.onClose = () => this.state = State.DISCONNECTED;
	}

	private parseMessageSize(buffer: Uint8Array) {
	const dv = new DataView(buffer.buffer, buffer.byteOffset, buffer.length);
	return dv.getUint32(0, true);
	}

	private parseMessage(frameBuffer: Uint8Array) {
	const frame = perfetto.ipc.Frame.decode(frameBuffer);
	this.handleIncomingFrame(frame);
	}

	private incompleteSizeHeader() {
	if (!this.frameToParseLen) {
	console.assert(this.incomingBufferLen < WIRE_PROTOCOL_HEADER_SIZE);
	return true;
	}
	return false;
	}

	private canCompleteSizeHeader(newData: Uint8Array) {
	return newData.length + this.incomingBufferLen > WIRE_PROTOCOL_HEADER_SIZE;
	}

	private canParseFullMessage(newData: Uint8Array) {
	return this.frameToParseLen &&
	this.incomingBufferLen + newData.length >= this.frameToParseLen;
	}

	private appendToIncomingBuffer(array: Uint8Array) {
	this.incomingBuffer.set(array, this.incomingBufferLen);
	this.incomingBufferLen += array.length;
	}

	handleReceivedData(newData: Uint8Array) {
	if (this.incompleteSizeHeader() && this.canCompleteSizeHeader(newData)) {
	const newDataBytesToRead =
	WIRE_PROTOCOL_HEADER_SIZE - this.incomingBufferLen;
	// Add to the incoming buffer the remaining bytes to arrive at
	// WIRE_PROTOCOL_HEADER_SIZE
	this.appendToIncomingBuffer(newData.subarray(0, newDataBytesToRead));
	newData = newData.subarray(newDataBytesToRead);

	this.frameToParseLen = this.parseMessageSize(this.incomingBuffer);
	this.incomingBufferLen = 0;
	}

	// Parse all complete messages in incomingBuffer and newData.
	while (this.canParseFullMessage(newData)) {
	// All the message is in the newData buffer.
	if (this.incomingBufferLen === 0) {
	this.parseMessage(newData.subarray(0, this.frameToParseLen));
	newData = newData.subarray(this.frameToParseLen);
	} else { // We need to complete the local buffer.
	// Read the remaining part of this message.
	const bytesToCompleteMessage =
	this.frameToParseLen - this.incomingBufferLen;
	this.appendToIncomingBuffer(
	newData.subarray(0, bytesToCompleteMessage));
	this.parseMessage(
	this.incomingBuffer.subarray(0, this.frameToParseLen));
	this.incomingBufferLen = 0;
	// Remove the data just parsed.
	newData = newData.subarray(bytesToCompleteMessage);
	}
	this.frameToParseLen = 0;
	if (!this.canCompleteSizeHeader(newData)) break;

	this.frameToParseLen =
	this.parseMessageSize(newData.subarray(0, WIRE_PROTOCOL_HEADER_SIZE));
	newData = newData.subarray(WIRE_PROTOCOL_HEADER_SIZE);
	}
	// Buffer the remaining data (part of the next header + message).
	this.appendToIncomingBuffer(newData);
	}

	decodeResponse(
	requestId: number, responseProto: Uint8Array, hasMore = false) {
	const method = this.requestMethods.get(requestId);
	if (!method) {
	console.error(`Unknown request id: ${requestId}`);
	this.sendErrorMessage(`Wire protocol error.`);
	return;
	}
	const decoder = decoders.get(method);
	if (decoder === undefined) {
	console.error(`Unable to decode method: ${method}`);
	return;
	}
	const decodedResponse = decoder(responseProto);
	const response = {type: `${method}Response`, ...decodedResponse};

	// TODO(nicomazz): Fix this.
	// We assemble all the trace and then send it back to the main controller.
	// This is a temporary solution, that will be changed in a following CL,
	// because now both the chrome consumer port and the other adb consumer port
	// send back the entire trace, while the correct behavior should be to send
	// back the slices, that are assembled by the main record controller.
	if (isReadBuffersResponse(response)) {
	if (response.slices) this.handleSlices(response.slices);
	if (!hasMore) this.sendReadBufferResponse();
	return;
	}
	this.sendMessage(response);
	}

	handleSlices(slices: ISlice[]) {
	for (const slice of slices) {
	this.partialPacket.push(slice);
	if (slice.lastSliceForPacket) {
	const tracePacket = this.generateTracePacket(this.partialPacket);
	this.traceProtoWriter.uint32(TRACE_PACKET_PROTO_TAG);
	this.traceProtoWriter.bytes(tracePacket);
	this.partialPacket = [];
	}
	}
	}

	generateTracePacket(slices: ISlice[]): Uint8Array {
	let bufferSize = 0;
	for (const slice of slices) bufferSize += slice.data!.length;
	const fullBuffer = new Uint8Array(bufferSize);
	let written = 0;
	for (const slice of slices) {
	const data = slice.data!;
	fullBuffer.set(data, written);
	written += data.length;
	}
	return fullBuffer;
	}

	sendReadBufferResponse() {
	const readBufferResponse: ReadBuffersResponse = {
	type: 'ReadBuffersResponse',
	slices: [{data: this.traceProtoWriter.finish(), lastSliceForPacket: true}]
	};

	this.sendMessage(readBufferResponse);
	}

	bind() {
	console.assert(this.socket !== undefined);
	const requestId = this.requestId++;
	const frame = new perfetto.ipc.Frame({
	requestId,
	msgBindService:
	new perfetto.ipc.Frame.BindService({serviceName: 'ConsumerPort'})
	});
	return new Promise((resolve, _) => {
	this.resolveBindingPromise = resolve;
	this.sendFrame(frame);
	});
	}

	findMethodId(method: string): number\|undefined {
	const methodObject = this.availableMethods.find((m) => m.name === method);
	if (methodObject && methodObject.id) return methodObject.id;
	return undefined;
	}

	async findDevice() {
	if (!globals.state.androidDeviceConnected) return undefined;
	const targetSerial = globals.state.androidDeviceConnected.serial;
	const devices = await navigator.usb.getDevices();
	return devices.find(d => d.serialNumber === targetSerial);
	}

	handleIncomingFrame(frame: perfetto.ipc.Frame) {
	const requestId = frame.requestId as number;
	switch (frame.msg) {
	case 'msgBindServiceReply': {
	const msgBindServiceReply = frame.msgBindServiceReply;
	if (msgBindServiceReply && msgBindServiceReply.methods &&
	msgBindServiceReply.serviceId) {
	console.assert(msgBindServiceReply.success);
	this.availableMethods = msgBindServiceReply.methods;
	this.serviceId = msgBindServiceReply.serviceId;
	this.resolveBindingPromise();
	this.resolveBindingPromise = () => {};
	}
	return;
	}
	case 'msgInvokeMethodReply': {
	const msgInvokeMethodReply = frame.msgInvokeMethodReply;
	if (msgInvokeMethodReply && msgInvokeMethodReply.replyProto) {
	console.assert(msgInvokeMethodReply.success);
	this.decodeResponse(
	requestId,
	msgInvokeMethodReply.replyProto,
	msgInvokeMethodReply.hasMore === true);
	}
	return;
	}
	default:
	console.error(`not recognized frame message: ${frame.msg}`);
	}
	}
	}

	const decoders =
	new Map<string, Function>()
	.set('EnableTracing', perfetto.protos.EnableTracingResponse.decode)
	.set('FreeBuffers', perfetto.protos.FreeBuffersResponse.decode)
	.set('ReadBuffers', perfetto.protos.ReadBuffersResponse.decode)
	.set('DisableTracing', perfetto.protos.DisableTracingResponse.decode)
	.set('GetTraceStats', perfetto.protos.GetTraceStatsResponse.decode);