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BigInt() to convert hex to unsigned 64 int string #124

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BigInt() to convert hex to unsigned 64 int string #124

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90 changes: 4 additions & 86 deletions opentelemetry/node-microservice/logger.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,97 +2,15 @@
// eslint-disable-next-line
const otel = require('@opentelemetry/api');
const winston = require('winston')
const UINT_MAX = 4294967296

// Convert a buffer to a numerical string.
function toNumberString (buffer, radix) {
let high = readInt32(buffer, 0)
let low = readInt32(buffer, 4)
let str = ''

radix = radix || 10

while (1) {
const mod = (high % radix) * UINT_MAX + low

high = Math.floor(high / radix)
low = Math.floor(mod / radix)
str = (mod % radix).toString(radix) + str

if (!high && !low) break
}

return str
}

// Convert a numerical string to a buffer using the specified radix.
function fromString (str, raddix) {
const buffer = new Uint8Array(8)
const len = str.length

let pos = 0
let high = 0
let low = 0

if (str[0] === '-') pos++

const sign = pos

while (pos < len) {
const chr = parseInt(str[pos++], raddix)

if (!(chr >= 0)) break // NaN

low = low * raddix + chr
high = high * raddix + Math.floor(low / UINT_MAX)
low %= UINT_MAX
}

if (sign) {
high = ~high

if (low) {
low = UINT_MAX - low
} else {
high++
}
}

writeUInt32BE(buffer, high, 0)
writeUInt32BE(buffer, low, 4)

return buffer
}

// Write unsigned integer bytes to a buffer.
function writeUInt32BE (buffer, value, offset) {
buffer[3 + offset] = value & 255
value = value >> 8
buffer[2 + offset] = value & 255
value = value >> 8
buffer[1 + offset] = value & 255
value = value >> 8
buffer[0 + offset] = value & 255
}

// Read a buffer to unsigned integer bytes.
function readInt32 (buffer, offset) {
return (buffer[offset + 0] * 16777216) +
(buffer[offset + 1] << 16) +
(buffer[offset + 2] << 8) +
buffer[offset + 3]
}

const tracingFormat = function () {
return winston.format(info => {
const span = otel.getSpan(otel.context.active());
if (span) {
// convert to dd with:
// https://github.com/DataDog/dd-trace-js/blob/master/packages/dd-trace/src/id.js
const context = span.context();
const traceIdEnd = context.traceId.slice(context.traceId.length / 2)
info['dd.trace_id'] = toNumberString(fromString(traceIdEnd,16))
info['dd.span_id'] = toNumberString(fromString(context.spanId,16))
const { spanId, traceId } = span.spanContext();
const traceIdEnd = traceId.slice(traceId.length / 2);
info['dd.trace_id'] = BigInt(`0x${traceIdEnd}`).toString();
info['dd.span_id'] = BigInt(`0x${spanId}`).toString();
}
return info;
})();
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