@opentelemetry/sdk-trace-base
Version:
51 lines • 1.46 kB
JavaScript
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
const TRACE_ID_BYTES = 16;
const SPAN_ID_BYTES = 8;
const TRACE_BUFFER = new Uint8Array(TRACE_ID_BYTES);
const SPAN_BUFFER = new Uint8Array(SPAN_ID_BYTES);
// Byte-to-hex lookup is faster than toString(16) in browsers
const HEX = Array.from({ length: 256 }, (_, i) => i.toString(16).padStart(2, '0'));
/**
* Fills buffer with random bytes, ensuring at least one is non-zero
* per W3C Trace Context spec.
*/
function randomFill(buf) {
for (let i = 0; i < buf.length; i++) {
buf[i] = (Math.random() * 256) >>> 0;
}
// Ensure non-zero
for (let i = 0; i < buf.length; i++) {
if (buf[i] > 0)
return;
}
buf[buf.length - 1] = 1;
}
function toHex(buf) {
let hex = '';
for (let i = 0; i < buf.length; i++) {
hex += HEX[buf[i]];
}
return hex;
}
export class RandomIdGenerator {
/**
* Returns a random 16-byte trace ID formatted/encoded as a 32 lowercase hex
* characters corresponding to 128 bits.
*/
generateTraceId() {
randomFill(TRACE_BUFFER);
return toHex(TRACE_BUFFER);
}
/**
* Returns a random 8-byte span ID formatted/encoded as a 16 lowercase hex
* characters corresponding to 64 bits.
*/
generateSpanId() {
randomFill(SPAN_BUFFER);
return toHex(SPAN_BUFFER);
}
}
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