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Viewing file:     getChunkedStream.js (4.53 KB)      -rw-r--r--

import { __asyncGenerator, __await, __generator } from "tslib";
export function getChunkedStream(source) {
    var _a;
    var currentMessageTotalLength = 0;
    var currentMessagePendingLength = 0;
    var currentMessage = null;
    var messageLengthBuffer = null;
    var allocateMessage = function (size) {
        if (typeof size !== "number") {
            throw new Error("Attempted to allocate an event message where size was not a number: " + size);
        }
        currentMessageTotalLength = size;
        currentMessagePendingLength = 4;
        currentMessage = new Uint8Array(size);
        var currentMessageView = new DataView(currentMessage.buffer);
        currentMessageView.setUint32(0, size, false);
    };
    var iterator = function () {
        return __asyncGenerator(this, arguments, function () {
            var sourceIterator, _a, value, done, chunkLength, currentOffset, bytesRemaining, numBytesForTotal, numBytesToWrite;
            return __generator(this, function (_b) {
                switch (_b.label) {
                    case 0:
                        sourceIterator = source[Symbol.asyncIterator]();
                        _b.label = 1;
                    case 1:
                        if (!true) return [3, 16];
                        return [4, __await(sourceIterator.next())];
                    case 2:
                        _a = _b.sent(), value = _a.value, done = _a.done;
                        if (!done) return [3, 10];
                        if (!!currentMessageTotalLength) return [3, 4];
                        return [4, __await(void 0)];
                    case 3: return [2, _b.sent()];
                    case 4:
                        if (!(currentMessageTotalLength === currentMessagePendingLength)) return [3, 7];
                        return [4, __await(currentMessage)];
                    case 5: return [4, _b.sent()];
                    case 6:
                        _b.sent();
                        return [3, 8];
                    case 7: throw new Error("Truncated event message received.");
                    case 8: return [4, __await(void 0)];
                    case 9: return [2, _b.sent()];
                    case 10:
                        chunkLength = value.length;
                        currentOffset = 0;
                        _b.label = 11;
                    case 11:
                        if (!(currentOffset < chunkLength)) return [3, 15];
                        if (!currentMessage) {
                            bytesRemaining = chunkLength - currentOffset;
                            if (!messageLengthBuffer) {
                                messageLengthBuffer = new Uint8Array(4);
                            }
                            numBytesForTotal = Math.min(4 - currentMessagePendingLength, bytesRemaining);
                            messageLengthBuffer.set(value.slice(currentOffset, currentOffset + numBytesForTotal), currentMessagePendingLength);
                            currentMessagePendingLength += numBytesForTotal;
                            currentOffset += numBytesForTotal;
                            if (currentMessagePendingLength < 4) {
                                return [3, 15];
                            }
                            allocateMessage(new DataView(messageLengthBuffer.buffer).getUint32(0, false));
                            messageLengthBuffer = null;
                        }
                        numBytesToWrite = Math.min(currentMessageTotalLength - currentMessagePendingLength, chunkLength - currentOffset);
                        currentMessage.set(value.slice(currentOffset, currentOffset + numBytesToWrite), currentMessagePendingLength);
                        currentMessagePendingLength += numBytesToWrite;
                        currentOffset += numBytesToWrite;
                        if (!(currentMessageTotalLength && currentMessageTotalLength === currentMessagePendingLength)) return [3, 14];
                        return [4, __await(currentMessage)];
                    case 12: return [4, _b.sent()];
                    case 13:
                        _b.sent();
                        currentMessage = null;
                        currentMessageTotalLength = 0;
                        currentMessagePendingLength = 0;
                        _b.label = 14;
                    case 14: return [3, 11];
                    case 15: return [3, 1];
                    case 16: return [2];
                }
            });
        });
    };
    return _a = {},
        _a[Symbol.asyncIterator] = iterator,
        _a;
}