feat(core): Introduce processEvent hook on Integration

packages/core/src/baseclient.ts

@@ -12,6 +12,7 @@ import type {
   Event,
   EventDropReason,
   EventHint,
+  EventProcessor,
   Integration,
   IntegrationClass,
   Outcome,
@@ -43,6 +44,7 @@ import {
 
 import { getEnvelopeEndpointWithUrlEncodedAuth } from './api';
 import { createEventEnvelope, createSessionEnvelope } from './envelope';
+import { notifyEventProcessors } from './eventProcessors';
 import type { IntegrationIndex } from './integration';
 import { setupIntegration, setupIntegrations } from './integration';
 import type { Scope } from './scope';
@@ -107,6 +109,8 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
   // eslint-disable-next-line @typescript-eslint/ban-types
   private _hooks: Record<string, Function[]>;
 
+  private _eventProcessors: EventProcessor[];
+
   /**
    * Initializes this client instance.
    *
@@ -119,6 +123,7 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
     this._numProcessing = 0;
     this._outcomes = {};
     this._hooks = {};
+    this._eventProcessors = [];
 
     if (options.dsn) {
       this._dsn = makeDsn(options.dsn);
@@ -280,6 +285,11 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
     });
   }
 
+  /** @inheritDoc */
+  public addEventProcessor(eventProcessor: EventProcessor): void {
+    this._eventProcessors.push(eventProcessor);
+  }
+
   /**
    * Sets up the integrations
    */
@@ -545,36 +555,41 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
 
     this.emit('preprocessEvent', event, hint);
 
-    return prepareEvent(options, event, hint, scope).then(evt => {
-      if (evt === null) {
-        return evt;
-      }
+    return prepareEvent(options, event, hint, scope)
+      .then(evt => {
+        // Process client-scoped event processors
+        return notifyEventProcessors(this._eventProcessors, evt, hint);
+      })
+      .then(evt => {
+        if (evt === null) {
+          return evt;
+        }
 
-      // If a trace context is not set on the event, we use the propagationContext set on the event to
-      // generate a trace context. If the propagationContext does not have a dynamic sampling context, we
-      // also generate one for it.
-      const { propagationContext } = evt.sdkProcessingMetadata || {};
-      const trace = evt.contexts && evt.contexts.trace;
-      if (!trace && propagationContext) {
-        const { traceId: trace_id, spanId, parentSpanId, dsc } = propagationContext as PropagationContext;
-        evt.contexts = {
-          trace: {
-            trace_id,
-            span_id: spanId,
-            parent_span_id: parentSpanId,
-          },
-          ...evt.contexts,
-        };
+        // If a trace context is not set on the event, we use the propagationContext set on the event to
+        // generate a trace context. If the propagationContext does not have a dynamic sampling context, we
+        // also generate one for it.
+        const { propagationContext } = evt.sdkProcessingMetadata || {};
+        const trace = evt.contexts && evt.contexts.trace;
+        if (!trace && propagationContext) {
+          const { traceId: trace_id, spanId, parentSpanId, dsc } = propagationContext as PropagationContext;
+          evt.contexts = {
+            trace: {
+              trace_id,
+              span_id: spanId,
+              parent_span_id: parentSpanId,
+            },
+            ...evt.contexts,
+          };
 
-        const dynamicSamplingContext = dsc ? dsc : getDynamicSamplingContextFromClient(trace_id, this, scope);
+          const dynamicSamplingContext = dsc ? dsc : getDynamicSamplingContextFromClient(trace_id, this, scope);
 
-        evt.sdkProcessingMetadata = {
-          dynamicSamplingContext,
-          ...evt.sdkProcessingMetadata,
-        };
-      }
-      return evt;
-    });
+          evt.sdkProcessingMetadata = {
+            dynamicSamplingContext,
+            ...evt.sdkProcessingMetadata,
+          };
+        }
+        return evt;
+      });
   }
 
   /**

packages/core/src/eventProcessors.ts

@@ -0,0 +1,51 @@
+import type { Event, EventHint, EventProcessor } from '@sentry/types';
+import { getGlobalSingleton, isThenable, logger, SyncPromise } from '@sentry/utils';
+
+/**
+ * Returns the global event processors.
+ */
+export function getGlobalEventProcessors(): EventProcessor[] {
+  return getGlobalSingleton<EventProcessor[]>('globalEventProcessors', () => []);
+}
+
+/**
+ * Add a EventProcessor to be kept globally.
+ * @param callback EventProcessor to add
+ */
+export function addGlobalEventProcessor(callback: EventProcessor): void {
+  getGlobalEventProcessors().push(callback);
+}
+
+/**
+ * Process an array of event processors, returning the processed event (or `null` if the event was dropped).
+ */
+export function notifyEventProcessors(
+  processors: EventProcessor[],
+  event: Event | null,
+  hint: EventHint,
+  index: number = 0,
+): PromiseLike<Event | null> {
+  return new SyncPromise<Event | null>((resolve, reject) => {
+    const processor = processors[index];
+    if (event === null || typeof processor !== 'function') {
+      resolve(event);
+    } else {
+      const result = processor({ ...event }, hint) as Event | null;
+
+      __DEBUG_BUILD__ &&
+        processor.id &&
+        result === null &&
+        logger.log(`Event processor "${processor.id}" dropped event`);
+
+      if (isThenable(result)) {
+        void result
+          .then(final => notifyEventProcessors(processors, final, hint, index + 1).then(resolve))
+          .then(null, reject);
+      } else {
+        void notifyEventProcessors(processors, result, hint, index + 1)
+          .then(resolve)
+          .then(null, reject);
+      }
+    }
+  });
+}

packages/core/src/index.ts

@@ -36,7 +36,8 @@ export {
 } from './hub';
 export { makeSession, closeSession, updateSession } from './session';
 export { SessionFlusher } from './sessionflusher';
-export { addGlobalEventProcessor, Scope } from './scope';
+export { Scope } from './scope';
+export { addGlobalEventProcessor } from './eventProcessors';
 export { getEnvelopeEndpointWithUrlEncodedAuth, getReportDialogEndpoint } from './api';
 export { BaseClient } from './baseclient';
 export { ServerRuntimeClient } from './server-runtime-client';

packages/core/src/integration.ts

@@ -1,8 +1,8 @@
-import type { Client, Integration, Options } from '@sentry/types';
+import type { Client, Event, EventHint, Integration, Options } from '@sentry/types';
 import { arrayify, logger } from '@sentry/utils';
 
+import { addGlobalEventProcessor } from './eventProcessors';
 import { getCurrentHub } from './hub';
-import { addGlobalEventProcessor } from './scope';
 
 declare module '@sentry/types' {
   interface Integration {
@@ -107,10 +107,20 @@ export function setupIntegration(client: Client, integration: Integration, integ
   }
 
   if (client.on && typeof integration.preprocessEvent === 'function') {
-    const callback = integration.preprocessEvent.bind(integration);
+    const callback = integration.preprocessEvent.bind(integration) as typeof integration.preprocessEvent;
     client.on('preprocessEvent', (event, hint) => callback(event, hint, client));
   }
 
+  if (client.addEventProcessor && typeof integration.processEvent === 'function') {
+    const callback = integration.processEvent.bind(integration) as typeof integration.processEvent;
+
+    const processor = Object.assign((event: Event, hint: EventHint) => callback(event, hint, client), {
+      id: integration.name,
+    });
+
+    client.addEventProcessor(processor);
+  }
+
   __DEBUG_BUILD__ && logger.log(`Integration installed: ${integration.name}`);
 }
 

packages/core/src/scope.ts

@@ -22,17 +22,9 @@ import type {
   Transaction,
   User,
 } from '@sentry/types';
-import {
-  arrayify,
-  dateTimestampInSeconds,
-  getGlobalSingleton,
-  isPlainObject,
-  isThenable,
-  logger,
-  SyncPromise,
-  uuid4,
-} from '@sentry/utils';
+import { arrayify, dateTimestampInSeconds, isPlainObject, uuid4 } from '@sentry/utils';
 
+import { getGlobalEventProcessors, notifyEventProcessors } from './eventProcessors';
 import { updateSession } from './session';
 
 /**
@@ -525,7 +517,7 @@ export class Scope implements ScopeInterface {
       propagationContext: this._propagationContext,
     };
 
-    return this._notifyEventProcessors([...getGlobalEventProcessors(), ...this._eventProcessors], event, hint);
+    return notifyEventProcessors([...getGlobalEventProcessors(), ...this._eventProcessors], event, hint);
   }
 
   /**
@@ -559,40 +551,6 @@ export class Scope implements ScopeInterface {
     return this._breadcrumbs;
   }
 
-  /**
-   * This will be called after {@link applyToEvent} is finished.
-   */
-  protected _notifyEventProcessors(
-    processors: EventProcessor[],
-    event: Event | null,
-    hint: EventHint,
-    index: number = 0,
-  ): PromiseLike<Event | null> {
-    return new SyncPromise<Event | null>((resolve, reject) => {
-      const processor = processors[index];
-      if (event === null || typeof processor !== 'function') {
-        resolve(event);
-      } else {
-        const result = processor({ ...event }, hint) as Event | null;
-
-        __DEBUG_BUILD__ &&
-          processor.id &&
-          result === null &&
-          logger.log(`Event processor "${processor.id}" dropped event`);
-
-        if (isThenable(result)) {
-          void result
-            .then(final => this._notifyEventProcessors(processors, final, hint, index + 1).then(resolve))
-            .then(null, reject);
-        } else {
-          void this._notifyEventProcessors(processors, result, hint, index + 1)
-            .then(resolve)
-            .then(null, reject);
-        }
-      }
-    });
-  }
-
   /**
    * This will be called on every set call.
    */
@@ -629,21 +587,6 @@ export class Scope implements ScopeInterface {
   }
 }
 
-/**
- * Returns the global event processors.
- */
-function getGlobalEventProcessors(): EventProcessor[] {
-  return getGlobalSingleton<EventProcessor[]>('globalEventProcessors', () => []);
-}
-
-/**
- * Add a EventProcessor to be kept globally.
- * @param callback EventProcessor to add
- */
-export function addGlobalEventProcessor(callback: EventProcessor): void {
-  getGlobalEventProcessors().push(callback);
-}
-
 function generatePropagationContext(): PropagationContext {
   return {
     traceId: uuid4(),

packages/types/src/client.ts

@@ -5,6 +5,7 @@ import type { DataCategory } from './datacategory';
 import type { DsnComponents } from './dsn';
 import type { DynamicSamplingContext, Envelope } from './envelope';
 import type { Event, EventHint } from './event';
+import type { EventProcessor } from './eventprocessor';
 import type { Integration, IntegrationClass } from './integration';
 import type { ClientOptions } from './options';
 import type { Scope } from './scope';
@@ -120,6 +121,13 @@ export interface Client<O extends ClientOptions = ClientOptions> {
    */
   flush(timeout?: number): PromiseLike<boolean>;
 
+  /**
+   * Adds an event processor that applies to any event processed by this client.
+   *
+   * TODO (v8): Make this a required method.
+   */
+  addEventProcessor?(eventProcessor: EventProcessor): void;
+
   /** Returns the client's instance of the given integration class, it any. */
   getIntegration<T extends Integration>(integration: IntegrationClass<T>): T | null;
 

packages/types/src/integration.ts

@@ -30,4 +30,10 @@ export interface Integration {
    * An optional hook that allows to preprocess an event _before_ it is passed to all other event processors.
    */
   preprocessEvent?(event: Event, hint: EventHint | undefined, client: Client): void;
+
+  /**
+   * An optional hook that allows to process an event.
+   * Return `null` to drop the event, or mutate the event & return it.
+   */
+  processEvent?(event: Event, hint: EventHint | undefined, client: Client): Event | null | PromiseLike<Event | null>;
 }