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{ Event, EventProcessor, Exception, Hub, Integration, StackFrame } from '@sentry/types';\nimport { logger } from '@sentry/utils';\n\nimport { IS_DEBUG_BUILD } from '../flags';\n\n/** Deduplication filter */\nexport class Dedupe implements Integration {\n /**\n * @inheritDoc\n */\n public static id: string = 'Dedupe';\n\n /**\n * @inheritDoc\n */\n public name: string = Dedupe.id;\n\n /**\n * @inheritDoc\n */\n private _previousEvent?: Event;\n\n /**\n * @inheritDoc\n */\n public setupOnce(addGlobalEventProcessor: (callback: EventProcessor) => void, getCurrentHub: () => Hub): void {\n addGlobalEventProcessor((currentEvent: Event) => {\n const self = getCurrentHub().getIntegration(Dedupe);\n if (self) {\n // Juuust in case something goes wrong\n try {\n if (_shouldDropEvent(currentEvent, self._previousEvent)) {\n IS_DEBUG_BUILD && logger.warn('Event dropped due to being a duplicate of previously captured event.');\n return null;\n }\n } catch (_oO) {\n return (self._previousEvent = currentEvent);\n }\n\n return (self._previousEvent = currentEvent);\n }\n return currentEvent;\n });\n }\n}\n\n/** JSDoc */\nfunction _shouldDropEvent(currentEvent: Event, previousEvent?: Event): boolean {\n if (!previousEvent) {\n return false;\n }\n\n if (_isSameMessageEvent(currentEvent, previousEvent)) {\n return true;\n }\n\n if (_isSameExceptionEvent(currentEvent, previousEvent)) {\n return true;\n }\n\n return false;\n}\n\n/** JSDoc */\nfunction _isSameMessageEvent(currentEvent: Event, previousEvent: Event): boolean {\n const currentMessage = currentEvent.message;\n const previousMessage = previousEvent.message;\n\n // If neither event has a message property, they were both exceptions, so bail out\n if (!currentMessage && !previousMessage) {\n return false;\n }\n\n // If only one event has a stacktrace, but not the other one, they are not the same\n if ((currentMessage && !previousMessage) || (!currentMessage && previousMessage)) {\n return false;\n }\n\n if (currentMessage !== previousMessage) {\n return false;\n }\n\n if (!_isSameFingerprint(currentEvent, previousEvent)) {\n return false;\n }\n\n if (!_isSameStacktrace(currentEvent, previousEvent)) {\n return false;\n }\n\n return true;\n}\n\n/** JSDoc */\nfunction _isSameExceptionEvent(currentEvent: Event, previousEvent: Event): boolean {\n const previousException = _getExceptionFromEvent(previousEvent);\n const currentException = _getExceptionFromEvent(currentEvent);\n\n if (!previousException || !currentException) {\n return false;\n }\n\n if (previousException.type !== currentException.type || previousException.value !== currentException.value) {\n return false;\n }\n\n if (!_isSameFingerprint(currentEvent, previousEvent)) {\n return false;\n }\n\n if (!_isSameStacktrace(currentEvent, previousEvent)) {\n return false;\n }\n\n return true;\n}\n\n/** JSDoc */\nfunction _isSameStacktrace(currentEvent: Event, previousEvent: Event): boolean {\n let currentFrames = _getFramesFromEvent(currentEvent);\n let previousFrames = _getFramesFromEvent(previousEvent);\n\n // If neither event has a stacktrace, they are assumed to be the same\n if (!currentFrames && !previousFrames) {\n return true;\n }\n\n // If only one event has a stacktrace, but not the other one, they are not the same\n if ((currentFrames && !previousFrames) || (!currentFrames && previousFrames)) {\n return false;\n }\n\n currentFrames = currentFrames as StackFrame[];\n previousFrames = previousFrames as StackFrame[];\n\n // If number of frames differ, they are not the same\n if (previousFrames.length !== currentFrames.length) {\n return false;\n }\n\n // Otherwise, compare the two\n for (let i = 0; i < previousFrames.length; i++) {\n const frameA = previousFrames[i];\n const frameB = currentFrames[i];\n\n if (\n frameA.filename !== frameB.filename ||\n frameA.lineno !== frameB.lineno ||\n frameA.colno !== frameB.colno ||\n frameA.function !== frameB.function\n ) {\n return false;\n }\n }\n\n return true;\n}\n\n/** JSDoc */\nfunction _isSameFingerprint(currentEvent: Event, previousEvent: Event): boolean {\n let currentFingerprint = currentEvent.fingerprint;\n let previousFingerprint = previousEvent.fingerprint;\n\n // If neither event has a fingerprint, they are assumed to be the same\n if (!currentFingerprint && !previousFingerprint) {\n return true;\n }\n\n // If only one event has a fingerprint, but not the other one, they are not the same\n if ((currentFingerprint && !previousFingerprint) || (!currentFingerprint && previousFingerprint)) {\n return false;\n }\n\n currentFingerprint = currentFingerprint as string[];\n previousFingerprint = previousFingerprint as string[];\n\n // Otherwise, compare the two\n try {\n return !!(currentFingerprint.join('') === previousFingerprint.join(''));\n } catch (_oO) {\n return false;\n }\n}\n\n/** JSDoc */\nfunction _getExceptionFromEvent(event: Event): Exception | undefined {\n return event.exception && event.exception.values && event.exception.values[0];\n}\n\n/** JSDoc */\nfunction _getFramesFromEvent(event: Event): StackFrame[] | undefined {\n const exception = event.exception;\n\n if (exception) {\n try {\n // @ts-ignore Object could be undefined\n return exception.values[0].stacktrace.frames;\n } catch (_oO) {\n return undefined;\n }\n } else if (event.stacktrace) {\n return event.stacktrace.frames;\n }\n return undefined;\n}\n"]} |