ref(backend): Port functionality from Backend to Client (#4911)

port all the functionality from the Backend classes to the Client classes. This includes:

* Backend (interface)
* BaseBackend
* BrowserBackend
* NodeBackend
* TestBackend

Additionally, fix the unit and integration tests in Core to spy on TestClient instead of TestBackend.

packages/browser/src/backend.ts

@@ -8,6 +8,8 @@ import { FetchTransport, makeNewFetchTransport, makeNewXHRTransport, XHRTranspor
 /**
  * Configuration options for the Sentry Browser SDK.
  * @see BrowserClient for more information.
+ *
+ * TODO(v7): move to client
  */
 export interface BrowserOptions extends Options {
   /**

packages/browser/src/client.ts

@@ -1,17 +1,20 @@
-import { BaseClient, Scope, SDK_VERSION } from '@sentry/core';
-import { Event, EventHint } from '@sentry/types';
-import { getGlobalObject, logger } from '@sentry/utils';
+import { BaseClient, getEnvelopeEndpointWithUrlEncodedAuth, initAPIDetails, Scope, SDK_VERSION } from '@sentry/core';
+import { Event, EventHint, Severity, Transport, TransportOptions } from '@sentry/types';
+import { getGlobalObject, logger, supportsFetch } from '@sentry/utils';
 
 import { BrowserBackend, BrowserOptions } from './backend';
+import { eventFromException, eventFromMessage } from './eventbuilder';
 import { IS_DEBUG_BUILD } from './flags';
 import { injectReportDialog, ReportDialogOptions } from './helpers';
 import { Breadcrumbs } from './integrations';
+import { FetchTransport, makeNewFetchTransport, makeNewXHRTransport, XHRTransport } from './transports';
 
 /**
  * The Sentry Browser SDK Client.
  *
  * @see BrowserOptions for documentation on configuration options.
  * @see SentryClient for usage documentation.
+ * TODO(v7): remove BrowserBackend
  */
 export class BrowserClient extends BaseClient<BrowserBackend, BrowserOptions> {
   /**
@@ -32,6 +35,7 @@ export class BrowserClient extends BaseClient<BrowserBackend, BrowserOptions> {
       version: SDK_VERSION,
     };
 
+    // TODO(v7): remove BrowserBackend param
     super(BrowserBackend, options);
   }
 
@@ -58,6 +62,20 @@ export class BrowserClient extends BaseClient<BrowserBackend, BrowserOptions> {
     });
   }
 
+  /**
+   * @inheritDoc
+   */
+  public eventFromException(exception: unknown, hint?: EventHint): PromiseLike<Event> {
+    return eventFromException(exception, hint, this._options.attachStacktrace);
+  }
+
+  /**
+   * @inheritDoc
+   */
+  public eventFromMessage(message: string, level: Severity = Severity.Info, hint?: EventHint): PromiseLike<Event> {
+    return eventFromMessage(message, level, hint, this._options.attachStacktrace);
+  }
+
   /**
    * @inheritDoc
    */
@@ -76,4 +94,40 @@ export class BrowserClient extends BaseClient<BrowserBackend, BrowserOptions> {
     }
     super._sendEvent(event);
   }
+
+  /**
+   * @inheritDoc
+   */
+  protected _setupTransport(): Transport {
+    if (!this._options.dsn) {
+      // We return the noop transport here in case there is no Dsn.
+      return super._setupTransport();
+    }
+
+    const transportOptions: TransportOptions = {
+      ...this._options.transportOptions,
+      dsn: this._options.dsn,
+      tunnel: this._options.tunnel,
+      sendClientReports: this._options.sendClientReports,
+      _metadata: this._options._metadata,
+    };
+
+    const api = initAPIDetails(transportOptions.dsn, transportOptions._metadata, transportOptions.tunnel);
+    const url = getEnvelopeEndpointWithUrlEncodedAuth(api.dsn, api.tunnel);
+
+    if (this._options.transport) {
+      return new this._options.transport(transportOptions);
+    }
+    if (supportsFetch()) {
+      const requestOptions: RequestInit = { ...transportOptions.fetchParameters };
+      this._newTransport = makeNewFetchTransport({ requestOptions, url });
+      return new FetchTransport(transportOptions);
+    }
+
+    this._newTransport = makeNewXHRTransport({
+      url,
+      headers: transportOptions.headers,
+    });
+    return new XHRTransport(transportOptions);
+  }
 }

packages/browser/src/exports.ts

@@ -41,6 +41,7 @@ export {
   withScope,
 } from '@sentry/core';
 
+// TODO(v7): refactor to use client here!
 export { BrowserOptions } from './backend';
 export { BrowserClient } from './client';
 export { injectReportDialog, ReportDialogOptions } from './helpers';

packages/browser/test/unit/backend.test.ts

@@ -2,6 +2,8 @@ import { BrowserBackend } from '../../src/backend';
 
 let backend: BrowserBackend;
 
+// TODO(v7): remove when deleting Backend
+
 describe('BrowserBackend', () => {
   describe('sendEvent()', () => {
     it('should use NoopTransport', () => {

packages/browser/test/unit/index.test.ts

@@ -246,7 +246,7 @@ describe('SentryBrowser initialization', () => {
     it('should set SDK data when Sentry.init() is called', () => {
       init({ dsn });
 
-      const sdkData = (getCurrentHub().getClient() as any)._backend._transport._api.metadata?.sdk;
+      const sdkData = (getCurrentHub().getClient() as any).getTransport()._api.metadata?.sdk;
 
       expect(sdkData.name).toBe('sentry.javascript.browser');
       expect(sdkData.packages[0].name).toBe('npm:@sentry/browser');
@@ -257,7 +257,7 @@ describe('SentryBrowser initialization', () => {
     it('should set SDK data when instantiating a client directly', () => {
       const client = new BrowserClient({ dsn });
 
-      const sdkData = (client as any)._backend._transport._api.metadata?.sdk;
+      const sdkData = (client as any).getTransport()._api.metadata?.sdk;
 
       expect(sdkData.name).toBe('sentry.javascript.browser');
       expect(sdkData.packages[0].name).toBe('npm:@sentry/browser');
@@ -285,7 +285,7 @@ describe('SentryBrowser initialization', () => {
         },
       });
 
-      const sdkData = (getCurrentHub().getClient() as any)._backend._transport._api.metadata?.sdk;
+      const sdkData = (getCurrentHub().getClient() as any).getTransport()._api.metadata?.sdk;
 
       expect(sdkData.name).toBe('sentry.javascript.angular');
       expect(sdkData.packages[0].name).toBe('npm:@sentry/angular');

packages/browser/test/unit/integrations/linkederrors.test.ts

@@ -34,6 +34,7 @@ describe('LinkedErrors', () => {
       one.cause = two;
 
       const originalException = one;
+      // TODO(v7): refactor to use client here!
       const backend = new BrowserBackend({});
       return backend.eventFromException(originalException).then(event => {
         const result = LinkedErrorsModule._handler('cause', 5, event, {
@@ -65,6 +66,7 @@ describe('LinkedErrors', () => {
 
       const originalException = one;
       const backend = new BrowserBackend({});
+      // TODO(v7): refactor to use client here!
       return backend.eventFromException(originalException).then(event => {
         const result = LinkedErrorsModule._handler('reason', 5, event, {
           originalException,
@@ -92,6 +94,7 @@ describe('LinkedErrors', () => {
 
       const backend = new BrowserBackend({});
       const originalException = one;
+      // TODO(v7): refactor to use client here!
       return backend.eventFromException(originalException).then(event => {
         const result = LinkedErrorsModule._handler('cause', 2, event, {
           originalException,

packages/core/src/baseclient.ts

@@ -28,15 +28,21 @@ import {
   uuid4,
 } from '@sentry/utils';
 
+import { initAPIDetails } from './api';
 import { Backend, BackendClass } from './basebackend';
 import { IS_DEBUG_BUILD } from './flags';
 import { IntegrationIndex, setupIntegrations } from './integration';
+import { createEventEnvelope, createSessionEnvelope } from './request';
+import { NewTransport } from './transports/base';
+import { NoopTransport } from './transports/noop';
 
 const ALREADY_SEEN_ERROR = "Not capturing exception because it's already been captured.";
 
 /**
  * Base implementation for all JavaScript SDK clients.
  *
+ * TODO(v7): refactor doc w.r.t. Backend
+ *
  * Call the constructor with the corresponding backend constructor and options
  * specific to the client subclass. To access these options later, use
  * {@link Client.getOptions}. Also, the Backend instance is available via
@@ -71,6 +77,7 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
    * The backend used to physically interact in the environment. Usually, this
    * will correspond to the client. When composing SDKs, however, the Backend
    * from the root SDK will be used.
+   * TODO(v7): DELETE
    */
   protected readonly _backend: B;
 
@@ -86,19 +93,30 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
   /** Number of calls being processed */
   protected _numProcessing: number = 0;
 
+  /** Cached transport used internally. */
+  protected _transport: Transport;
+
+  /** New v7 Transport that is initialized alongside the old one */
+  protected _newTransport?: NewTransport;
+
   /**
    * Initializes this client instance.
    *
    * @param backendClass A constructor function to create the backend.
    * @param options Options for the client.
    */
   protected constructor(backendClass: BackendClass<B, O>, options: O) {
+    // TODO(v7): Delete
     this._backend = new backendClass(options);
     this._options = options;
 
     if (options.dsn) {
       this._dsn = makeDsn(options.dsn);
+    } else {
+      IS_DEBUG_BUILD && logger.warn('No DSN provided, client will not do anything.');
     }
+
+    this._transport = this._setupTransport();
   }
 
   /**
@@ -115,8 +133,7 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
     let eventId: string | undefined = hint && hint.event_id;
 
     this._process(
-      this._getBackend()
-        .eventFromException(exception, hint)
+      this.eventFromException(exception, hint)
         .then(event => this._captureEvent(event, hint, scope))
         .then(result => {
           eventId = result;
@@ -133,8 +150,8 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
     let eventId: string | undefined = hint && hint.event_id;
 
     const promisedEvent = isPrimitive(message)
-      ? this._getBackend().eventFromMessage(String(message), level, hint)
-      : this._getBackend().eventFromException(message, hint);
+      ? this.eventFromMessage(String(message), level, hint)
+      : this.eventFromException(message, hint);
 
     this._process(
       promisedEvent
@@ -204,7 +221,7 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
    * @inheritDoc
    */
   public getTransport(): Transport {
-    return this._getBackend().getTransport();
+    return this._transport;
   }
 
   /**
@@ -249,6 +266,57 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
     }
   }
 
+  /**
+   * @inheritDoc
+   */
+  public sendEvent(event: Event): void {
+    // TODO(v7): Remove the if-else
+    if (
+      this._newTransport &&
+      this._options.dsn &&
+      this._options._experiments &&
+      this._options._experiments.newTransport
+    ) {
+      const api = initAPIDetails(this._options.dsn, this._options._metadata, this._options.tunnel);
+      const env = createEventEnvelope(event, api);
+      void this._newTransport.send(env).then(null, reason => {
+        IS_DEBUG_BUILD && logger.error('Error while sending event:', reason);
+      });
+    } else {
+      void this._transport.sendEvent(event).then(null, reason => {
+        IS_DEBUG_BUILD && logger.error('Error while sending event:', reason);
+      });
+    }
+  }
+
+  /**
+   * @inheritDoc
+   */
+  public sendSession(session: Session): void {
+    if (!this._transport.sendSession) {
+      IS_DEBUG_BUILD && logger.warn("Dropping session because custom transport doesn't implement sendSession");
+      return;
+    }
+
+    // TODO(v7): Remove the if-else
+    if (
+      this._newTransport &&
+      this._options.dsn &&
+      this._options._experiments &&
+      this._options._experiments.newTransport
+    ) {
+      const api = initAPIDetails(this._options.dsn, this._options._metadata, this._options.tunnel);
+      const [env] = createSessionEnvelope(session, api);
+      void this._newTransport.send(env).then(null, reason => {
+        IS_DEBUG_BUILD && logger.error('Error while sending session:', reason);
+      });
+    } else {
+      void this._transport.sendSession(session).then(null, reason => {
+        IS_DEBUG_BUILD && logger.error('Error while sending session:', reason);
+      });
+    }
+  }
+
   /** Updates existing session based on the provided event */
   protected _updateSessionFromEvent(session: Session, event: Event): void {
     let crashed = false;
@@ -283,8 +351,9 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
   }
 
   /** Deliver captured session to Sentry */
+  // TODO(v7): should this be deleted?
   protected _sendSession(session: Session): void {
-    this._getBackend().sendSession(session);
+    this.sendSession(session);
   }
 
   /**
@@ -317,7 +386,9 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
     });
   }
 
-  /** Returns the current backend. */
+  /** Returns the current backend.
+   * TODO(v7): DELETE
+   */
   protected _getBackend(): B {
     return this._backend;
   }
@@ -490,8 +561,9 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
    * Tells the backend to send this event
    * @param event The Sentry event to send
    */
+  // TODO(v7): refactor: get rid of method?
   protected _sendEvent(event: Event): void {
-    this._getBackend().sendEvent(event);
+    this.sendEvent(event);
   }
 
   /**
@@ -618,6 +690,24 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
       },
     );
   }
+
+  /**
+   * Sets up the transport so it can be used later to send requests.
+   */
+  protected _setupTransport(): Transport {
+    return new NoopTransport();
+  }
+
+  /**
+   * @inheritDoc
+   */
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/explicit-module-boundary-types
+  public abstract eventFromException(_exception: any, _hint?: EventHint): PromiseLike<Event>;
+
+  /**
+   * @inheritDoc
+   */
+  public abstract eventFromMessage(_message: string, _level?: Severity, _hint?: EventHint): PromiseLike<Event>;
 }
 
 /**

packages/core/src/index.ts

@@ -23,6 +23,7 @@ export {
   getReportDialogEndpoint,
 } from './api';
 export { BaseClient } from './baseclient';
+// TODO(v7): Delete!
 export { BackendClass, BaseBackend } from './basebackend';
 export { eventToSentryRequest, sessionToSentryRequest } from './request';
 export { initAndBind, ClientClass } from './sdk';