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1 line
18 KiB
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{"ast":null,"code":"import { getGlobalObject } from './global.js';\nimport { dynamicRequire, isNodeEnv } from './node.js';\n\n/**\n * An object that can return the current timestamp in seconds since the UNIX epoch.\n */\n\n/**\n * A TimestampSource implementation for environments that do not support the Performance Web API natively.\n *\n * Note that this TimestampSource does not use a monotonic clock. A call to `nowSeconds` may return a timestamp earlier\n * than a previously returned value. We do not try to emulate a monotonic behavior in order to facilitate debugging. It\n * is more obvious to explain \"why does my span have negative duration\" than \"why my spans have zero duration\".\n */\nvar dateTimestampSource = {\n nowSeconds: () => Date.now() / 1000\n};\n\n/**\n * A partial definition of the [Performance Web API]{@link https://developer.mozilla.org/en-US/docs/Web/API/Performance}\n * for accessing a high-resolution monotonic clock.\n */\n\n/**\n * Returns a wrapper around the native Performance API browser implementation, or undefined for browsers that do not\n * support the API.\n *\n * Wrapping the native API works around differences in behavior from different browsers.\n */\nfunction getBrowserPerformance() {\n const {\n performance\n } = getGlobalObject();\n if (!performance || !performance.now) {\n return undefined;\n }\n\n // Replace performance.timeOrigin with our own timeOrigin based on Date.now().\n //\n // This is a partial workaround for browsers reporting performance.timeOrigin such that performance.timeOrigin +\n // performance.now() gives a date arbitrarily in the past.\n //\n // Additionally, computing timeOrigin in this way fills the gap for browsers where performance.timeOrigin is\n // undefined.\n //\n // The assumption that performance.timeOrigin + performance.now() ~= Date.now() is flawed, but we depend on it to\n // interact with data coming out of performance entries.\n //\n // Note that despite recommendations against it in the spec, browsers implement the Performance API with a clock that\n // might stop when the computer is asleep (and perhaps under other circumstances). Such behavior causes\n // performance.timeOrigin + performance.now() to have an arbitrary skew over Date.now(). In laptop computers, we have\n // observed skews that can be as long as days, weeks or months.\n //\n // See https://github.com/getsentry/sentry-javascript/issues/2590.\n //\n // BUG: despite our best intentions, this workaround has its limitations. It mostly addresses timings of pageload\n // transactions, but ignores the skew built up over time that can aversely affect timestamps of navigation\n // transactions of long-lived web pages.\n var timeOrigin = Date.now() - performance.now();\n return {\n now: () => performance.now(),\n timeOrigin\n };\n}\n\n/**\n * Returns the native Performance API implementation from Node.js. Returns undefined in old Node.js versions that don't\n * implement the API.\n */\nfunction getNodePerformance() {\n try {\n var perfHooks = dynamicRequire(module, 'perf_hooks');\n return perfHooks.performance;\n } catch (_) {\n return undefined;\n }\n}\n\n/**\n * The Performance API implementation for the current platform, if available.\n */\nvar platformPerformance = isNodeEnv() ? getNodePerformance() : getBrowserPerformance();\nvar timestampSource = platformPerformance === undefined ? dateTimestampSource : {\n nowSeconds: () => (platformPerformance.timeOrigin + platformPerformance.now()) / 1000\n};\n\n/**\n * Returns a timestamp in seconds since the UNIX epoch using the Date API.\n */\nvar dateTimestampInSeconds = dateTimestampSource.nowSeconds.bind(dateTimestampSource);\n\n/**\n * Returns a timestamp in seconds since the UNIX epoch using either the Performance or Date APIs, depending on the\n * availability of the Performance API.\n *\n * See `usingPerformanceAPI` to test whether the Performance API is used.\n *\n * BUG: Note that because of how browsers implement the Performance API, the clock might stop when the computer is\n * asl
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