/
function_registry.ts
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/
function_registry.ts
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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import {HttpFunction, CloudEventFunction, HandlerFunction} from './functions';
import {SignatureType} from './types';
interface RegisteredFunction {
signatureType: SignatureType;
userFunction: HandlerFunction;
}
/**
* Singleton map to hold the registered functions
*/
const registrationContainer = new Map<string, RegisteredFunction>();
/**
* Helper method to store a registered function in the registration container
*/
const register = (
functionName: string,
signatureType: SignatureType,
userFunction: HandlerFunction
): void => {
registrationContainer.set(functionName, {
signatureType,
userFunction,
});
};
/**
* Get a declaratively registered function
* @param functionName the name with which the function was registered
* @returns the registered function and signature type or undefined no function matching
* the provided name has been registered.
*/
export const getRegisteredFunction = (
functionName: string
): RegisteredFunction | undefined => {
return registrationContainer.get(functionName);
};
/**
* Register a function that responds to HTTP requests.
* @param functionName the name of the function
* @param handler the function to invoke when handling HTTP requests
*/
export const http = (functionName: string, handler: HttpFunction): void => {
register(functionName, 'http', handler);
};
/**
* Register a function that handles CloudEvents.
* @param functionName the name of the function
* @param handler the function to trigger when handling cloudevents
*/
export const cloudevent = (
functionName: string,
handler: CloudEventFunction
): void => {
register(functionName, 'cloudevent', handler);
};