@foxglove/ws-protocol-examples/dist/esm/ws-protocol/src/parse.js

Foxglove WebSocket protocol examples

import { BinaryOpcode, ClientBinaryOpcode, FetchAssetStatus, } from "./types";
const textDecoder = new TextDecoder();
export function parseServerMessage(buffer) {
    const view = buffer instanceof ArrayBuffer
        ? new DataView(buffer)
        : buffer instanceof DataView
            ? buffer
            : new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength);
    let offset = 0;
    const op = view.getUint8(offset);
    offset += 1;
    switch (op) {
        case BinaryOpcode.MESSAGE_DATA: {
            const subscriptionId = view.getUint32(offset, true);
            offset += 4;
            const timestamp = view.getBigUint64(offset, true);
            offset += 8;
            const data = new DataView(view.buffer, view.byteOffset + offset, view.byteLength - offset);
            return { op, subscriptionId, timestamp, data };
        }
        case BinaryOpcode.TIME: {
            const timestamp = view.getBigUint64(offset, true);
            return { op, timestamp };
        }
        case BinaryOpcode.SERVICE_CALL_RESPONSE: {
            const serviceId = view.getUint32(offset, true);
            offset += 4;
            const callId = view.getUint32(offset, true);
            offset += 4;
            const encodingLength = view.getUint32(offset, true);
            offset += 4;
            const encodingBytes = new DataView(view.buffer, view.byteOffset + offset, encodingLength);
            const encoding = textDecoder.decode(encodingBytes);
            offset += encodingLength;
            const data = new Uint8Array(view.buffer, view.byteOffset + offset, view.byteLength - offset);
            return { op, serviceId, callId, encoding, data };
        }
        case BinaryOpcode.FETCH_ASSET_RESPONSE: {
            const requestId = view.getUint32(offset, true);
            offset += 4;
            const status = view.getUint8(offset);
            offset += 1;
            const errorMsgLength = view.getUint32(offset, true);
            offset += 4;
            const error = textDecoder.decode(new DataView(view.buffer, view.byteOffset + offset, errorMsgLength));
            offset += errorMsgLength;
            switch (status) {
                case FetchAssetStatus.SUCCESS: {
                    const data = new DataView(view.buffer, view.byteOffset + offset, view.byteLength - offset);
                    return { op, requestId, status, data };
                }
                case FetchAssetStatus.ERROR:
                    return { op, requestId, status, error };
                default:
                    throw new Error(`Unrecognized fetch asset status: ${status}`);
            }
        }
    }
    throw new Error(`Unrecognized server opcode in binary message: ${op.toString(16)}`);
}
export function parseClientMessage(buffer) {
    const view = buffer instanceof ArrayBuffer
        ? new DataView(buffer)
        : buffer instanceof DataView
            ? buffer
            : new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength);
    let offset = 0;
    const op = view.getUint8(offset);
    offset += 1;
    switch (op) {
        case ClientBinaryOpcode.MESSAGE_DATA: {
            const channelId = view.getUint32(offset, true);
            offset += 4;
            const data = new Uint8Array(view.buffer, view.byteOffset + offset, view.byteLength - offset);
            return { op, channelId, data };
        }
        case ClientBinaryOpcode.SERVICE_CALL_REQUEST: {
            const serviceId = view.getUint32(offset, true);
            offset += 4;
            const callId = view.getUint32(offset, true);
            offset += 4;
            const encodingLength = view.getUint32(offset, true);
            offset += 4;
            const encodingBytes = new DataView(view.buffer, view.byteOffset + offset, encodingLength);
            const encoding = textDecoder.decode(encodingBytes);
            offset += encodingLength;
            const data = new Uint8Array(view.buffer, view.byteOffset + offset, view.byteLength - offset);
            return { op, serviceId, callId, encoding, data };
        }
    }
    throw new Error(`Unrecognized client opcode in binary message: ${op.toString(16)}`);
}
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