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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| import uuid from 'uuid/v4'; | ||
| import Promise from 'bluebird'; | ||
| import serializeError from 'serialize-error'; | ||
| import Map from 'es6-map'; | ||
| import { ipcMain } from 'electron'; // eslint-disable-line | ||
|
|
||
| export default class PromiseIpcBase { | ||
| constructor(opts, eventEmitter) { | ||
| if (opts) { | ||
| this.maxTimeoutMs = opts.maxTimeoutMs; | ||
| } | ||
| // either ipcRenderer or ipcMain | ||
| this.eventEmitter = eventEmitter; | ||
| this.listenerMap = new Map(); | ||
| } | ||
|
|
||
| send(route, sender, ...dataArgs) { | ||
| return new Promise((resolve, reject) => { | ||
| const replyChannel = `${route}#${uuid()}`; | ||
| let timeout; | ||
| let didTimeOut = false; | ||
|
|
||
| // ipcRenderer will send a message back to replyChannel when it finishes calculating | ||
| this.eventEmitter.once(replyChannel, (event, status, returnData) => { | ||
| clearTimeout(timeout); | ||
| if (didTimeOut) { | ||
| return null; | ||
| } | ||
| switch (status) { | ||
| case 'success': | ||
| return resolve(returnData); | ||
| case 'failure': | ||
| return reject(returnData); | ||
| default: | ||
| return reject(new Error(`Unexpected IPC call status "${status}" in ${route}`)); | ||
| } | ||
| }); | ||
| sender.send(route, replyChannel, ...dataArgs); | ||
|
|
||
| if (this.maxTimeoutMs) { | ||
| timeout = setTimeout(() => { | ||
| didTimeOut = true; | ||
| reject(new Error(`${route} timed out.`)); | ||
| }, this.maxTimeoutMs); | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| on(route, listener) { | ||
| // If listener has already been added, don't add it again. | ||
| if (this.listenerMap.has(listener)) { | ||
| return this; | ||
| } | ||
| // This function _wraps_ the listener argument. We maintain a map of | ||
| // listener -> wrapped listener in order to implement #off(). | ||
| const wrappedListener = (event, replyChannel, ...dataArgs) => { | ||
| // Chaining off of Promise.resolve() means that listener can return a promise, or return | ||
| // synchronously -- it can even throw. The end result will still be handled promise-like. | ||
| Promise.resolve() | ||
| .then(() => listener(...dataArgs)) | ||
| .then((results) => { | ||
| event.sender.send(replyChannel, 'success', results); | ||
| }) | ||
| .catch((e) => { | ||
| event.sender.send(replyChannel, 'failure', serializeError(e)); | ||
| }); | ||
| }; | ||
| this.listenerMap.set(listener, wrappedListener); | ||
| this.eventEmitter.on(route, wrappedListener); | ||
| return this; | ||
| } | ||
|
|
||
| off(route, listener) { | ||
| const wrappedListener = this.listenerMap.get(listener); | ||
| if (wrappedListener) { | ||
| this.eventEmitter.removeListener(route, wrappedListener); | ||
| this.listenerMap.delete(listener); | ||
| } | ||
| } | ||
| } |
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