@financialforcedev/orizuru
Version:
Streamlined communication between Heroku dynos / other worker processes
122 lines • 12.4 kB
JavaScript
;
/*
* Copyright (c) 2017-2019, FinancialForce.com, inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the FinancialForce.com, inc nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
Object.defineProperty(exports, "__esModule", { value: true });
/**
* @module handler
*/
const events_1 = require("events");
const lodash_1 = require("lodash");
const messageHandler_1 = require("./handler/messageHandler");
const handler_1 = require("./validator/handler");
const handlerFunction_1 = require("./validator/handlerFunction");
/**
* The Handler for consuming messages in a worker dyno created by {@link Server}.
* @extends EventEmitter
*/
class Handler extends events_1.EventEmitter {
/**
* Constructs a new 'Handler'.
*/
constructor(options) {
super();
this.options = options;
try {
// Validate the config
new handler_1.HandlerValidator(options);
// Define the transport
this.transport = options.transport;
// Define the handler function validator
this.validator = new handlerFunction_1.HandlerFunctionValidator();
}
catch (err) {
this.error(err);
throw err;
}
}
/**
* Initializes the handler.
*/
async init() {
await this.transport.connect();
}
/**
* Handles an incoming message from the transport layer.
*
* @param options The handle function options.
*
* @example
* ```typescript
*
* handler.handle({ schema, handler: ({ message, context }) => {
* console.log(message);
* console.log(context);
* }});
* ```
*/
async handle(options) {
try {
this.validator.validate(options);
}
catch (err) {
this.error(err);
throw err;
}
const eventName = lodash_1.get(options, 'subscribeOptions.eventName') || lodash_1.get(options, 'schema.name');
const handler = messageHandler_1.messageHandler(this, options);
const subscribeOptions = options.subscribeOptions || {
eventName
};
this.info(`Installing handler for ${eventName} events.`);
return this.transport.subscribe(handler, subscribeOptions);
}
/**
* Emit an error event.
*
* @param event The error event.
*/
error(event) {
this.emit(Handler.ERROR, event);
}
/**
* Emit an info event.
*
* @param event The info event.
*/
info(event) {
this.emit(Handler.INFO, event);
}
}
/**
* The error event name.
*/
Handler.ERROR = Symbol();
/**
* The info event name.
*/
Handler.INFO = Symbol();
exports.Handler = Handler;
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IN NO EVENT SHALL\n *  THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,\n *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\n *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY\n *  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\n *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n */\n\n/**\n * @module handler\n */\n\nimport { EventEmitter } from 'events';\nimport { get } from 'lodash';\n\nimport { ITransport, Options } from '..';\nimport { messageHandler } from './handler/messageHandler';\nimport { HandlerValidator } from './validator/handler';\nimport { HandlerFunctionValidator } from './validator/handlerFunction';\n\n/**\n * The Handler for consuming messages in a worker dyno created by {@link Server}.\n * @extends EventEmitter\n */\nexport class Handler extends EventEmitter {\n\n\t/**\n\t * The error event name.\n\t */\n\tpublic static readonly ERROR = Symbol();\n\n\t/**\n\t * The info event name.\n\t */\n\tpublic static readonly INFO = Symbol();\n\n\t/**\n\t * The Orizuru Handler Options.\n\t */\n\tpublic readonly options: Options.IHandler;\n\n\t/**\n\t * The transport layer for the handler.\n\t */\n\tprivate readonly transport: ITransport;\n\n\t/**\n\t * Validates Handler function options.\n\t */\n\tprivate readonly validator: HandlerFunctionValidator;\n\n\t/**\n\t * Constructs a new 'Handler'.\n\t */\n\tconstructor(options: Options.IHandler) {\n\n\t\tsuper();\n\n\t\tthis.options = options;\n\n\t\ttry {\n\n\t\t\t// Validate the config\n\t\t\tnew HandlerValidator(options);\n\n\t\t\t// Define the transport\n\t\t\tthis.transport = options.transport;\n\n\t\t\t// Define the handler function validator\n\t\t\tthis.validator = new HandlerFunctionValidator();\n\n\t\t} catch (err) {\n\t\t\tthis.error(err);\n\t\t\tthrow err;\n\t\t}\n\n\t}\n\n\t/**\n\t * Initializes the handler.\n\t */\n\tpublic async init() {\n\t\tawait this.transport.connect();\n\t}\n\n\t/**\n\t * Handles an incoming message from the transport layer.\n\t *\n\t * @param options The handle function options.\n\t *\n\t * @example\n\t * ```typescript\n\t *\n\t * handler.handle({ schema, handler: ({ message, context }) => {\n\t * \tconsole.log(message);\n\t * \tconsole.log(context);\n\t * }});\n\t * ```\n\t */\n\tpublic async handle<C extends Orizuru.Context, M extends Orizuru.Message>(options: Options.IHandlerFunction<C, M>) {\n\n\t\ttry {\n\t\t\tthis.validator.validate(options);\n\t\t} catch (err) {\n\t\t\tthis.error(err);\n\t\t\tthrow err;\n\t\t}\n\n\t\tconst eventName = get(options, 'subscribeOptions.eventName') || get(options, 'schema.name');\n\t\tconst handler = messageHandler(this, options);\n\t\tconst subscribeOptions = options.subscribeOptions || {\n\t\t\teventName\n\t\t};\n\n\t\tthis.info(`Installing handler for ${eventName} events.`);\n\n\t\treturn this.transport.subscribe(handler, subscribeOptions);\n\n\t}\n\n\t/**\n\t * Emit an error event.\n\t *\n\t * @param event The error event.\n\t */\n\tpublic error(event: any) {\n\t\tthis.emit(Handler.ERROR, event);\n\t}\n\n\t/**\n\t * Emit an info event.\n\t *\n\t * @param event The info event.\n\t */\n\tpublic info(event: any) {\n\t\tthis.emit(Handler.INFO, event);\n\t}\n\n}\n"]}