@akala/core
Version:
86 lines • 2.65 kB
JavaScript
import { process, convertToErrorMiddleware, isStandardMiddleware, isErrorMiddleware } from './shared.js';
/**
* MiddlewareIndexed class that implements Middleware.
* @template T
* @template TMiddleware
* @template TSpecialNextParam
*/
export class MiddlewareIndexed {
getIndexKey;
name;
_delegate;
/**
* Constructor for MiddlewareIndexed.
* @param {function} getIndexKey - Function to get the index key.
* @param {string} [name] - Optional name for the middleware.
*/
constructor(getIndexKey, name) {
this.getIndexKey = getIndexKey;
this.name = name;
}
/**
* Get the keys from the index.
* @returns {string[]} Array of keys.
*/
getKeys() {
return Object.keys(this.index).filter(v => v !== '');
}
index = {};
useMiddleware(key, middleware) {
if (key === null)
this._delegate = middleware;
else
this.index[key] = middleware;
return this;
}
/**
* Use an error handler.
* @param {function} handler - The error handler function.
* @returns {this} The current instance.
*/
useError(handler) {
return this.useMiddleware('', convertToErrorMiddleware(handler));
}
/**
* Process the request.
* @template X
* @param {...T} req - The request parameters.
* @returns {X} The result of the process.
*/
process(...req) {
return process(this, ...req);
}
/**
* Handle an error.
* @param {Error|OptionsResponse} error - The error to handle.
* @param {...T} req - The request parameters.
* @returns {MiddlewareResult<TSpecialNextParam>} The result of the error handling.
*/
handleError(error, ...req) {
if (isErrorMiddleware(this.index['']))
return this.index[''].handleError(error, ...req);
return error;
}
/**
* Handle the request.
* @param {...T} req - The request parameters.
* @returns {MiddlewareResult<TSpecialNextParam>} The result of the handling.
*/
handle(...req) {
var key = this.getIndexKey(...req);
if (!key || !this.index[key])
if (this._delegate)
return this._delegate.handle(...req);
else
return;
const middleware = this.index[key];
if (isStandardMiddleware(middleware)) {
const e = middleware.handle(...req);
if (typeof e === 'undefined' && this._delegate)
return this._delegate.handle(...req);
return e;
}
return;
}
}
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