Marc Mintel
5397309103
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50 lines
1.9 KiB
Plaintext
50 lines
1.9 KiB
Plaintext
/*
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* Copyright The OpenTelemetry Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const SPAN_ID_BYTES = 8;
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const TRACE_ID_BYTES = 16;
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export class RandomIdGenerator {
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/**
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* Returns a random 16-byte trace ID formatted/encoded as a 32 lowercase hex
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* characters corresponding to 128 bits.
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*/
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generateTraceId = getIdGenerator(TRACE_ID_BYTES);
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/**
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* Returns a random 8-byte span ID formatted/encoded as a 16 lowercase hex
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* characters corresponding to 64 bits.
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*/
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generateSpanId = getIdGenerator(SPAN_ID_BYTES);
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}
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const SHARED_BUFFER = Buffer.allocUnsafe(TRACE_ID_BYTES);
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function getIdGenerator(bytes) {
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return function generateId() {
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for (let i = 0; i < bytes / 4; i++) {
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// unsigned right shift drops decimal part of the number
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// 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
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SHARED_BUFFER.writeUInt32BE((Math.random() * 2 ** 32) >>> 0, i * 4);
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}
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// If buffer is all 0, set the last byte to 1 to guarantee a valid w3c id is generated
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for (let i = 0; i < bytes; i++) {
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if (SHARED_BUFFER[i] > 0) {
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break;
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}
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else if (i === bytes - 1) {
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SHARED_BUFFER[bytes - 1] = 1;
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}
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}
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return SHARED_BUFFER.toString('hex', 0, bytes);
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};
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}
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//# sourceMappingURL=RandomIdGenerator.js.map |