Function _processEvent

packages/core/src/client.ts:1424–1529

* Processes an event (either error or message) and sends it to Sentry. * * This also adds breadcrumbs and context information to the event. However, * platform specific meta data (such as the User's IP address) must be added * by the SDK implementor. * * * @param event The event

(
    event: Event,
    hint: EventHint,
    currentScope: Scope,
    isolationScope: Scope,
  )

   * @returns A SyncPromise that resolves with the event or rejects in case event was/will not be send.
   */
  protected _processEvent(
    event: Event,
    hint: EventHint,
    currentScope: Scope,
    isolationScope: Scope,
  ): PromiseLike<Event> {
    const options = this.getOptions();
    const { sampleRate } = options;

    const isTransaction = isTransactionEvent(event);
    const isError = isErrorEvent(event);
    const eventType = event.type || 'error';
    const beforeSendLabel = `before send for type \`${eventType}\``;

    // 1.0 === 100% events are sent
    // 0.0 === 0% events are sent
    // Sampling for transaction happens somewhere else
    const parsedSampleRate = typeof sampleRate === 'undefined' ? undefined : parseSampleRate(sampleRate);
    if (isError && typeof parsedSampleRate === 'number' && safeMathRandom() > parsedSampleRate) {
      this.recordDroppedEvent('sample_rate', 'error');
      return rejectedSyncPromise(
        _makeDoNotSendEventError(
          `Discarding event because it's not included in the random sample (sampling rate = ${sampleRate})`,
        ),
      );
    }

    const dataCategory = getDataCategoryByType(event.type);

    return this._prepareEvent(event, hint, currentScope, isolationScope)
      .then(prepared => {
        if (prepared === null) {
          this.recordDroppedEvent('event_processor', dataCategory);
          throw _makeDoNotSendEventError('An event processor returned `null`, will not send event.');
        }

        const isInternalException = (hint.data as { __sentry__: boolean })?.__sentry__ === true;
        if (isInternalException) {
          return prepared;
        }

        const result = processBeforeSend(this, options, prepared, hint);
        return _validateBeforeSendResult(result, beforeSendLabel);
      })
      .then(processedEvent => {
        if (processedEvent === null) {
          this.recordDroppedEvent('before_send', dataCategory);
          if (isTransaction) {
            const spans = event.spans || [];
            // the transaction itself counts as one span, plus all the child spans that are added
            const spanCount = 1 + spans.length;
            this.recordDroppedEvent('before_send', 'span', spanCount);
          }
          throw _makeDoNotSendEventError(`${beforeSendLabel} returned \`null\`, will not send event.`);
        }

        const session = currentScope.getSession() || isolationScope.getSession();
        if (isError && session) {