| 1 | 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* Copyright The OpenTelemetry Authors\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * https://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as api from '@opentelemetry/api';\nimport { otperformance as performance } from '../platform';\nimport { TimeOriginLegacy } from './types';\n\nconst NANOSECOND_DIGITS = 9;\nconst NANOSECOND_DIGITS_IN_MILLIS = 6;\nconst MILLISECONDS_TO_NANOSECONDS = Math.pow(10, NANOSECOND_DIGITS_IN_MILLIS);\nconst SECOND_TO_NANOSECONDS = Math.pow(10, NANOSECOND_DIGITS);\n\n/**\n * Converts a number of milliseconds from epoch to HrTime([seconds, remainder in nanoseconds]).\n * @param epochMillis\n */\nexport function millisToHrTime(epochMillis: number): api.HrTime {\n const epochSeconds = epochMillis / 1000;\n // Decimals only.\n const seconds = Math.trunc(epochSeconds);\n // Round sub-nanosecond accuracy to nanosecond.\n const nanos = Math.round((epochMillis % 1000) * MILLISECONDS_TO_NANOSECONDS);\n return [seconds, nanos];\n}\n\nexport function getTimeOrigin(): number {\n let timeOrigin = performance.timeOrigin;\n if (typeof timeOrigin !== 'number') {\n const perf: TimeOriginLegacy = performance as unknown as TimeOriginLegacy;\n timeOrigin = perf.timing && perf.timing.fetchStart;\n }\n return timeOrigin;\n}\n\n/**\n * Returns an hrtime calculated via performance component.\n * @param performanceNow\n */\nexport function hrTime(performanceNow?: number): api.HrTime {\n const timeOrigin = millisToHrTime(getTimeOrigin());\n const now = millisToHrTime(\n typeof performanceNow === 'number' ? performanceNow : performance.now()\n );\n\n return addHrTimes(timeOrigin, now);\n}\n\n/**\n *\n * Converts a TimeInput to an HrTime, defaults to _hrtime().\n * @param time\n */\nexport function timeInputToHrTime(time: api.TimeInput): api.HrTime {\n // process.hrtime\n if (isTimeInputHrTime(time)) {\n return time as api.HrTime;\n } else if (typeof time === 'number') {\n // Must be a performance.now() if it's smaller than process start time.\n if (time < getTimeOrigin()) {\n return hrTime(time);\n } else {\n // epoch milliseconds or performance.timeOrigin\n return millisToHrTime(time);\n }\n } else if (time instanceof Date) {\n return millisToHrTime(time.getTime());\n } else {\n throw TypeError('Invalid input type');\n }\n}\n\n/**\n * Returns a duration of two hrTime.\n * @param startTime\n * @param endTime\n */\nexport function hrTimeDuration(\n startTime: api.HrTime,\n endTime: api.HrTime\n): api.HrTime {\n let seconds = endTime[0] - startTime[0];\n let nanos = endTime[1] - startTime[1];\n\n // overflow\n if (nanos < 0) {\n seconds -= 1;\n // negate\n nanos += SECOND_TO_NANOSECONDS;\n }\n\n return [seconds, nanos];\n}\n\n/**\n * Convert hrTime to timestamp, for example \"2019-05-14T17:00:00.000123456Z\"\n * @param time\n */\nexport function hrTimeToTimeStamp(time: api.HrTime): string {\n const precision = NANOSECOND_DIGITS;\n const tmp = `${'0'.repeat(precision)}${time[1]}Z`;\n const nanoString = tmp.substr(tmp.length - precision - 1);\n const date = new Date(time[0] * 1000).toISOString();\n return date.replace('000Z', nanoString);\n}\n\n/**\n * Convert hrTime to nanoseconds.\n * @param time\n */\nexport function hrTimeToNanoseconds(time: api.HrTime): number {\n return time[0] * SECOND_TO_NANOSECONDS + time[1];\n}\n\n/**\n * Convert hrTime to milliseconds.\n * @param time\n */\nexport function hrTimeToMilliseconds(time: api.HrTime): number {\n return time[0] * 1e3 + time[1] / 1e6;\n}\n\n/**\n * Convert hrTime to microseconds.\n * @param time\n */\nexport function hrTimeToMicroseconds(time: api.HrTime): number {\n return time[0] * 1e6 + time[1] / 1e3;\n}\n\n/**\n * check if time is HrTime\n * @param value\n */\nexport function isTimeInputHrTime(value: unknown): value is api.HrTime {\n return (\n Array.isArray(value) &&\n value.length === 2 &&\n typeof value[0] === 'number' &&\n typeof value[1] === 'number'\n );\n}\n\n/**\n * check if input value is a correct types.TimeInput\n * @param value\n */\nexport function isTimeInput(\n value: unknown\n): value is api.HrTime | number | Date {\n return (\n isTimeInputHrTime(value) ||\n typeof value === 'number' ||\n value instanceof Date\n );\n}\n\n/**\n * Given 2 HrTime formatted times, return their sum as an HrTime.\n */\nexport function addHrTimes(time1: api.HrTime, time2: api.HrTime): api.HrTime {\n const out = [time1[0] + time2[0], time1[1] + time2[1]] as api.HrTime;\n\n // Nanoseconds\n if (out[1] >= SECOND_TO_NANOSECONDS) {\n out[1] -= SECOND_TO_NANOSECONDS;\n out[0] += 1;\n }\n\n return out;\n}\n"]} |