UNPKG

traceability

Version:

Traceability tools - middleware and winston logger

44 lines 1.73 kB
"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.RandomIdGenerator = void 0; /* eslint-disable no-bitwise */ /* eslint-disable no-plusplus */ var SPAN_ID_BYTES = 8; var TRACE_ID_BYTES = 16; var SHARED_BUFFER = Buffer.allocUnsafe(TRACE_ID_BYTES); function getIdGenerator(bytes) { return function generateId() { for (var i = 0; i < bytes / 4; i++) { // unsigned right shift drops decimal part of the number // it is required because if a number between 2**32 and 2**32 - 1 is generated, an out of range error is thrown by writeUInt32BE SHARED_BUFFER.writeUInt32BE((Math.random() * Math.pow(2, 32)) >>> 0, i * 4); } // If buffer is all 0, set the last byte to 1 to guarantee a valid w3c id is generated for (var i = 0; i < bytes; i++) { if (SHARED_BUFFER[i] > 0) { break; } else if (i === bytes - 1) { SHARED_BUFFER[bytes - 1] = 1; } } return SHARED_BUFFER.toString('hex', 0, bytes); }; } var RandomIdGenerator = /** @class */ (function () { function RandomIdGenerator() { } /** * Returns a random 16-byte trace ID formatted/encoded as a 32 lowercase hex * characters corresponding to 128 bits. */ RandomIdGenerator.generateTraceId = getIdGenerator(TRACE_ID_BYTES); /** * Returns a random 8-byte span ID formatted/encoded as a 16 lowercase hex * characters corresponding to 64 bits. */ RandomIdGenerator.generateSpanId = getIdGenerator(SPAN_ID_BYTES); return RandomIdGenerator; }()); exports.RandomIdGenerator = RandomIdGenerator; //# sourceMappingURL=idGenerator.js.map