ref(core): Rename Hub to AsyncContextStack & remove unneeded methods (#11630)

Should save some bundle size...! I also moved stuff around a bit so we
don't have so much somewhat unrelated stuff packed into the former
`hub.ts` file - needed some work to avoid circular dependencies, but I
think it's fine now.

I left the stuff we actually need in, and renamed it for clarity so this
is not confusing anymore.

closes #11482

Author: mydea

packages/core/src/asyncContext.ts

@@ -0,0 +1,31 @@
+import type { Carrier } from './../carrier';
+import { getMainCarrier, getSentryCarrier } from './../carrier';
+import { getStackAsyncContextStrategy } from './stackStrategy';
+import type { AsyncContextStrategy } from './types';
+
+/**
+ * @private Private API with no semver guarantees!
+ *
+ * Sets the global async context strategy
+ */
+export function setAsyncContextStrategy(strategy: AsyncContextStrategy | undefined): void {
+  // Get main carrier (global for every environment)
+  const registry = getMainCarrier();
+  const sentry = getSentryCarrier(registry);
+  sentry.acs = strategy;
+}
+
+/**
+ * Get the current async context strategy.
+ * If none has been setup, the default will be used.
+ */
+export function getAsyncContextStrategy(carrier: Carrier): AsyncContextStrategy {
+  const sentry = getSentryCarrier(carrier);
+
+  if (sentry.acs) {
+    return sentry.acs;
+  }
+
+  // Otherwise, use the default one (stack)
+  return getStackAsyncContextStrategy();
+}

packages/core/src/asyncContext/index.ts

@@ -0,0 +1,178 @@
+import type { Client, Scope as ScopeInterface } from '@sentry/types';
+import { isThenable } from '@sentry/utils';
+import { getDefaultCurrentScope, getDefaultIsolationScope } from '../currentScopes';
+import { Scope } from '../scope';
+
+import { getMainCarrier, getSentryCarrier } from './../carrier';
+import type { AsyncContextStrategy } from './types';
+
+interface Layer {
+  client?: Client;
+  scope: ScopeInterface;
+}
+
+/**
+ * This is an object that holds a stack of scopes.
+ */
+export class AsyncContextStack {
+  private readonly _stack: Layer[];
+  private _isolationScope: ScopeInterface;
+
+  public constructor(scope?: ScopeInterface, isolationScope?: ScopeInterface) {
+    let assignedScope;
+    if (!scope) {
+      assignedScope = new Scope();
+    } else {
+      assignedScope = scope;
+    }
+
+    let assignedIsolationScope;
+    if (!isolationScope) {
+      assignedIsolationScope = new Scope();
+    } else {
+      assignedIsolationScope = isolationScope;
+    }
+
+    this._stack = [{ scope: assignedScope }];
+    this._isolationScope = assignedIsolationScope;
+  }
+
+  /**
+   * Fork a scope for the stack.
+   */
+  public withScope<T>(callback: (scope: ScopeInterface) => T): T {
+    const scope = this._pushScope();
+
+    let maybePromiseResult: T;
+    try {
+      maybePromiseResult = callback(scope);
+    } catch (e) {
+      this._popScope();
+      throw e;
+    }
+
+    if (isThenable(maybePromiseResult)) {
+      // @ts-expect-error - isThenable returns the wrong type
+      return maybePromiseResult.then(
+        res => {
+          this._popScope();
+          return res;
+        },
+        e => {
+          this._popScope();
+          throw e;
+        },
+      );
+    }
+
+    this._popScope();
+    return maybePromiseResult;
+  }
+
+  /**
+   * Get the client of the stack.
+   */
+  public getClient<C extends Client>(): C | undefined {
+    return this.getStackTop().client as C;
+  }
+
+  /**
+   * Returns the scope of the top stack.
+   */
+  public getScope(): ScopeInterface {
+    return this.getStackTop().scope;
+  }
+
+  /**
+   * Get the isolation scope for the stack.
+   */
+  public getIsolationScope(): ScopeInterface {
+    return this._isolationScope;
+  }
+
+  /**
+   * Returns the scope stack for domains or the process.
+   */
+  public getStack(): Layer[] {
+    return this._stack;
+  }
+
+  /**
+   * Returns the topmost scope layer in the order domain > local > process.
+   */
+  public getStackTop(): Layer {
+    return this._stack[this._stack.length - 1];
+  }
+
+  /**
+   * Push a scope to the stack.
+   */
+  private _pushScope(): ScopeInterface {
+    // We want to clone the content of prev scope
+    const scope = this.getScope().clone();
+    this.getStack().push({
+      client: this.getClient(),
+      scope,
+    });
+    return scope;
+  }
+
+  /**
+   * Pop a scope from the stack.
+   */
+  private _popScope(): boolean {
+    if (this.getStack().length <= 1) return false;
+    return !!this.getStack().pop();
+  }
+}
+
+/**
+ * Get the global async context stack.
+ * This will be removed during the v8 cycle and is only here to make migration easier.
+ */
+function getAsyncContextStack(): AsyncContextStack {
+  const registry = getMainCarrier();
+  const sentry = getSentryCarrier(registry) as { hub?: AsyncContextStack };
+
+  // If there's no hub, or its an old API, assign a new one
+  if (sentry.hub) {
+    return sentry.hub;
+  }
+
+  sentry.hub = new AsyncContextStack(getDefaultCurrentScope(), getDefaultIsolationScope());
+  return sentry.hub;
+}
+
+function withScope<T>(callback: (scope: ScopeInterface) => T): T {
+  return getAsyncContextStack().withScope(callback);
+}
+
+function withSetScope<T>(scope: ScopeInterface, callback: (scope: ScopeInterface) => T): T {
+  const hub = getAsyncContextStack() as AsyncContextStack;
+  return hub.withScope(() => {
+    hub.getStackTop().scope = scope;
+    return callback(scope);
+  });
+}
+
+function withIsolationScope<T>(callback: (isolationScope: ScopeInterface) => T): T {
+  return getAsyncContextStack().withScope(() => {
+    return callback(getAsyncContextStack().getIsolationScope());
+  });
+}
+
+/**
+ * Get the stack-based async context strategy.
+ */
+export function getStackAsyncContextStrategy(): AsyncContextStrategy {
+  return {
+    withIsolationScope,
+    withScope,
+    withSetScope,
+    withSetIsolationScope: <T>(_isolationScope: ScopeInterface, callback: (isolationScope: ScopeInterface) => T) => {
+      return withIsolationScope(callback);
+    },
+    getCurrentScope: () => getAsyncContextStack().getScope(),
+    getIsolationScope: () => getAsyncContextStack().getIsolationScope(),
+  };
+}

packages/core/src/asyncContext/stackStrategy.ts

@@ -0,0 +1,67 @@
+import type { Scope } from '@sentry/types';
+import type {
+  startInactiveSpan,
+  startSpan,
+  startSpanManual,
+  suppressTracing,
+  withActiveSpan,
+} from './../tracing/trace';
+import type { getActiveSpan } from './../utils/spanUtils';
+
+/**
+ * @private Private API with no semver guarantees!
+ *
+ * Strategy used to track async context.
+ */
+export interface AsyncContextStrategy {
+  /**
+   * Fork the isolation scope inside of the provided callback.
+   */
+  withIsolationScope: <T>(callback: (isolationScope: Scope) => T) => T;
+
+  /**
+   * Fork the current scope inside of the provided callback.
+   */
+  withScope: <T>(callback: (isolationScope: Scope) => T) => T;
+
+  /**
+   * Set the provided scope as the current scope inside of the provided callback.
+   */
+  withSetScope: <T>(scope: Scope, callback: (scope: Scope) => T) => T;
+
+  /**
+   * Set the provided isolation as the current isolation scope inside of the provided callback.
+   */
+  withSetIsolationScope: <T>(isolationScope: Scope, callback: (isolationScope: Scope) => T) => T;
+
+  /**
+   * Get the currently active scope.
+   */
+  getCurrentScope: () => Scope;
+
+  /**
+   * Get the currently active isolation scope.
+   */
+  getIsolationScope: () => Scope;
+
+  // OPTIONAL: Custom tracing methods
+  // These are used so that we can provide OTEL-based implementations
+
+  /** Start an active span. */
+  startSpan?: typeof startSpan;
+
+  /** Start an inactive span. */
+  startInactiveSpan?: typeof startInactiveSpan;
+
+  /** Start an active manual span. */
+  startSpanManual?: typeof startSpanManual;
+
+  /** Get the currently active span. */
+  getActiveSpan?: typeof getActiveSpan;
+
+  /** Make a span the active span in the context of the callback. */
+  withActiveSpan?: typeof withActiveSpan;
+
+  /** Suppress tracing in the given callback, ensuring no spans are generated inside of it.  */
+  suppressTracing?: typeof suppressTracing;
+}