117 lines
3.9 KiB
TypeScript
117 lines
3.9 KiB
TypeScript
import * as fs from 'fs';
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import * as path from 'path';
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import { spawn, ChildProcessWithoutNullStreams } from 'child_process';
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// i.e. my-app/app-0.1.13/
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const appFolder = path.dirname(process.execPath);
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// i.e. my-app/Update.exe
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const updateExe = path.resolve(appFolder, '..', 'Update.exe');
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const exeName = path.basename(process.execPath);
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let spawnedArgs: string[] = [];
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let spawnedProcess: ChildProcessWithoutNullStreams | undefined;
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const isSameArgs = (args: string[]) => args.length === spawnedArgs.length && args.every((e, i) => e === spawnedArgs[i]);
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// Spawn a command and invoke the callback when it completes with an error
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// and the output from standard out.
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const spawnUpdate = function (args: string[], detached: boolean, callback: Function) {
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let error: Error, errorEmitted: boolean, stderr: string, stdout: string;
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try {
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// Ensure we don't spawn multiple squirrel processes
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// Process spawned, same args: Attach events to alread running process
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// Process spawned, different args: Return with error
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// No process spawned: Spawn new process
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if (spawnedProcess && !isSameArgs(args)) {
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// Disabled for backwards compatibility:
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// eslint-disable-next-line standard/no-callback-literal
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return callback(`AutoUpdater process with arguments ${args} is already running`);
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} else if (!spawnedProcess) {
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spawnedProcess = spawn(updateExe, args, {
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detached: detached,
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windowsHide: true
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});
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spawnedArgs = args || [];
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}
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} catch (error1) {
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error = error1;
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// Shouldn't happen, but still guard it.
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process.nextTick(function () {
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return callback(error);
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});
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return;
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}
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stdout = '';
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stderr = '';
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spawnedProcess.stdout.on('data', (data) => { stdout += data; });
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spawnedProcess.stderr.on('data', (data) => { stderr += data; });
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errorEmitted = false;
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spawnedProcess.on('error', (error) => {
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errorEmitted = true;
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callback(error);
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});
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return spawnedProcess.on('exit', function (code, signal) {
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spawnedProcess = undefined;
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spawnedArgs = [];
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// We may have already emitted an error.
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if (errorEmitted) {
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return;
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}
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// Process terminated with error.
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if (code !== 0) {
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// Disabled for backwards compatibility:
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// eslint-disable-next-line standard/no-callback-literal
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return callback(`Command failed: ${signal != null ? signal : code}\n${stderr}`);
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}
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// Success.
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callback(null, stdout);
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});
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};
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// Start an instance of the installed app.
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export function processStart () {
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return spawnUpdate(['--processStartAndWait', exeName], true, function () {});
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}
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// Download the releases specified by the URL and write new results to stdout.
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export function checkForUpdate (updateURL: string, callback: (error: Error | null, update?: any) => void) {
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return spawnUpdate(['--checkForUpdate', updateURL], false, function (error: Error, stdout: string) {
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let ref, ref1, update;
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if (error != null) {
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return callback(error);
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}
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try {
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// Last line of output is the JSON details about the releases
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const json = stdout.trim().split('\n').pop();
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update = (ref = JSON.parse(json!)) != null ? (ref1 = ref.releasesToApply) != null ? typeof ref1.pop === 'function' ? ref1.pop() : undefined : undefined : undefined;
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} catch {
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// Disabled for backwards compatibility:
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// eslint-disable-next-line standard/no-callback-literal
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return callback(new Error(`Invalid result:\n${stdout}`));
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}
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return callback(null, update);
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});
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}
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// Update the application to the latest remote version specified by URL.
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export function update (updateURL: string, callback: (error: Error) => void) {
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return spawnUpdate(['--update', updateURL], false, callback);
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}
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// Is the Update.exe installed with the current application?
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export function supported () {
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try {
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fs.accessSync(updateExe, fs.constants.R_OK);
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return true;
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} catch {
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return false;
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}
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}
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