add getExecutionId() back as req.executionId is not accessible to event driven functions.

Author: liuyunnnn

docs/generated/api.md

@@ -58,6 +58,9 @@ export interface EventFunctionWithCallback {
     (data: {}, context: Context, callback: Function): any;
 }
 
+// @public
+export const getExecutionId: () => string | undefined;
+
 // @public
 export type HandlerFunction<T = unknown, U = unknown> = HttpFunction | EventFunction | EventFunctionWithCallback | CloudEventFunction<T> | CloudEventFunctionWithCallback<T> | TypedFunction<T, U>;
 

src/async_local_storage.ts

@@ -46,3 +46,7 @@ export function getCurrentContext(): ExecutionContext | undefined {
   }
   return asyncLocalStorage.getStore();
 }
+
+export const getCurrentExecutionId = (): string | undefined => {
+  return getCurrentContext()?.executionId;
+};

src/function_registry.ts

@@ -20,6 +20,7 @@ import {
   JsonInvocationFormat,
 } from './functions';
 import {SignatureType} from './types';
+import {getCurrentExecutionId} from './async_local_storage';
 
 interface RegisteredFunction<T, U> {
   signatureType: SignatureType;
@@ -65,6 +66,14 @@ export const isValidFunctionName = (functionName: string): boolean => {
   return regex.test(functionName);
 };
 
+/**
+ * Gets the request-specific execution id
+ * @public
+ */
+export const getExecutionId = (): string | undefined => {
+  return getCurrentExecutionId();
+};
+
 /**
  * Get a declaratively registered function
  * @param functionName the name with which the function was registered

src/functions.ts

@@ -32,6 +32,9 @@ export interface Request extends ExpressRequest {
    * A buffer which provides access to the request's raw HTTP body.
    */
   rawBody?: Buffer;
+  /**
+   * Request-specified execution id.
+   */
   executionId?: string;
   traceId?: string;
   spanId?: string;

src/index.ts

@@ -20,4 +20,4 @@ export * from './functions';
 /**
  * @public
  */
-export {http, cloudEvent, typed} from './function_registry';
+export {http, cloudEvent, typed, getExecutionId} from './function_registry';