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electron.js
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electron.js
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const fs = require('fs')
const os = require("os");
const path = require('path')
const {app, BrowserWindow, ipcMain, dialog, clipboard, nativeImage, shell, Tray, Menu} = require('electron')
const {autoUpdater} = require("electron-updater")
const log = require("electron-log");
const fsProm = require('fs/promises');
const PDFDocument = require('pdf-lib').PDFDocument;
const crc = require('crc');
const zlib = require('zlib');
const utils = require('./utils');
const config = require('./package.json');
let mainWindow = null,
mainTray = null,
subWindow = [],
willQuitApp = false,
devloadUrl = "",
devloadCachePath = path.resolve(__dirname, ".devload");
if (fs.existsSync(devloadCachePath)) {
devloadUrl = fs.readFileSync(devloadCachePath, 'utf8')
}
/**
* 创建主窗口
*/
function createMainWindow() {
mainWindow = new BrowserWindow({
width: 1280,
height: 800,
center: true,
autoHideMenuBar: true,
webPreferences: {
preload: path.join(__dirname, 'electron-preload.js'),
webSecurity: true,
nodeIntegration: true,
contextIsolation: true,
nativeWindowOpen: true
}
})
mainWindow.webContents.setUserAgent(mainWindow.webContents.getUserAgent() + " MainTaskWindow/" + process.platform + "/" + os.arch() + "/1.0");
if (devloadUrl) {
mainWindow.loadURL(devloadUrl).then(_ => {
})
} else {
mainWindow.loadFile('./public/index.html').then(_ => {
})
}
mainWindow.on('page-title-updated', (event, title) => {
if (title == "index.html") {
event.preventDefault()
}
})
mainWindow.on('close', event => {
if (!willQuitApp) {
utils.onBeforeUnload(event).then(() => {
if (process.platform === 'win32') {
mainWindow.hide()
} else if (process.platform === 'darwin') {
app.hide()
} else {
app.quit()
}
})
}
})
}
/**
* 创建子窗口
* @param args {path, hash, title, titleFixed, force, userAgent, config, webPreferences}
*/
function createSubWindow(args) {
if (!args) {
return;
}
if (!utils.isJson(args)) {
args = {path: args, config: {}}
}
let name = args.name || "auto_" + utils.randomString(6);
let item = subWindow.find(item => item.name == name);
let browser = item ? item.browser : null;
if (browser) {
browser.focus();
if (args.force === false) {
return;
}
} else {
let config = args.config || {};
let webPreferences = args.webPreferences || {};
browser = new BrowserWindow(Object.assign({
width: 1280,
height: 800,
center: true,
parent: mainWindow,
autoHideMenuBar: true,
webPreferences: Object.assign({
preload: path.join(__dirname, 'electron-preload.js'),
webSecurity: true,
nodeIntegration: true,
contextIsolation: true,
nativeWindowOpen: true
}, webPreferences),
}, config))
browser.on('page-title-updated', (event, title) => {
if (title == "index.html" || config.titleFixed === true) {
event.preventDefault()
}
})
browser.on('close', event => {
if (!willQuitApp) {
utils.onBeforeUnload(event).then(() => {
event.sender.destroy()
})
}
})
browser.on('closed', () => {
let index = subWindow.findIndex(item => item.name == name);
if (index > -1) {
subWindow.splice(index, 1)
}
})
subWindow.push({ name, browser })
}
browser.webContents.setUserAgent(browser.webContents.getUserAgent() + " SubTaskWindow/" + process.platform + "/" + os.arch() + "/1.0" + (args.userAgent ? (" " + args.userAgent) : ""));
if (devloadUrl) {
browser.loadURL(devloadUrl + '#' + (args.hash || args.path)).then(_ => {
})
} else {
browser.loadFile('./public/index.html', {
hash: args.hash || args.path
}).then(_ => {
})
}
}
const getTheLock = app.requestSingleInstanceLock()
if (!getTheLock) {
app.quit()
} else {
app.on('second-instance', () => {
utils.setShowWindow(mainWindow)
})
app.on('ready', () => {
// 创建主窗口
createMainWindow()
// 创建托盘
if (['darwin', 'win32'].includes(process.platform) && utils.isJson(config.trayIcon)) {
mainTray = new Tray(path.join(__dirname, config.trayIcon[devloadUrl ? 'dev' : 'prod'][process.platform === 'darwin' ? 'mac' : 'win']));
mainTray.on('click', () => {
utils.setShowWindow(mainWindow)
})
mainTray.setToolTip(config.name)
if (process.platform === 'win32') {
const trayMenu = Menu.buildFromTemplate([{
label: '显示',
click: () => {
utils.setShowWindow(mainWindow)
}
}, {
label: '退出',
click: () => {
app.quit()
}
}])
mainTray.setContextMenu(trayMenu)
}
}
})
}
app.on('activate', () => {
if (BrowserWindow.getAllWindows().length === 0) createMainWindow()
})
app.on('window-all-closed', () => {
if (willQuitApp || process.platform !== 'darwin') {
app.quit()
}
})
app.on('before-quit', () => {
willQuitApp = true
})
/**
* 打开文件
* @param args {path}
*/
ipcMain.on('openFile', (event, args) => {
utils.openFile(args.path)
event.returnValue = "ok"
})
/**
* 退出客户端
*/
ipcMain.on('windowQuit', (event) => {
event.returnValue = "ok"
app.quit();
})
/**
* 创建路由窗口
* @param args {path, ?}
*/
ipcMain.on('windowRouter', (event, args) => {
createSubWindow(args)
event.returnValue = "ok"
})
/**
* 隐藏窗口（mac、win隐藏，其他关闭）
*/
ipcMain.on('windowHidden', (event) => {
if (['darwin', 'win32'].includes(process.platform)) {
app.hide();
} else {
app.quit();
}
event.returnValue = "ok"
})
/**
* 关闭窗口
*/
ipcMain.on('windowClose', (event) => {
const win = BrowserWindow.fromWebContents(event.sender);
win.close()
event.returnValue = "ok"
})
/**
* 销毁窗口
*/
ipcMain.on('windowDestroy', (event) => {
const win = BrowserWindow.fromWebContents(event.sender);
win.destroy()
event.returnValue = "ok"
})
/**
* 关闭所有子窗口
*/
ipcMain.on('subWindowCloseAll', (event) => {
subWindow.some(({browser}) => {
browser && browser.close()
})
event.returnValue = "ok"
})
/**
* 销毁所有子窗口
*/
ipcMain.on('subWindowDestroyAll', (event) => {
subWindow.some(({browser}) => {
browser && browser.destroy()
})
event.returnValue = "ok"
})
/**
* 设置窗口尺寸
* @param args {width, height, autoZoom, minWidth, minHeight, maxWidth, maxHeight}
*/
ipcMain.on('windowSize', (event, args) => {
const win = BrowserWindow.fromWebContents(event.sender);
if (win) {
if (args.width || args.height) {
let [w, h] = win.getSize()
const width = args.width || w
const height = args.height || h
win.setSize(width, height, args.animate === true)
//
if (args.autoZoom === true) {
let move = false
let [x, y] = win.getPosition()
if (Math.abs(width - w) > 10) {
move = true
x -= (width - w) / 2
}
if (Math.abs(height - h) > 10) {
move = true
y -= (height - h) / 2
}
if (move) {
win.setPosition(Math.max(0, Math.floor(x)), Math.max(0, Math.floor(y)))
}
}
}
if (args.minWidth || args.minHeight) {
win.setMinimumSize(args.minWidth || win.getMinimumSize()[0], args.minHeight || win.getMinimumSize()[1])
}
if (args.maxWidth || args.maxHeight) {
win.setMaximumSize(args.maxWidth || win.getMaximumSize()[0], args.maxHeight || win.getMaximumSize()[1])
}
}
event.returnValue = "ok"
})
/**
* 设置窗口最小尺寸
* @param args {minWidth, minHeight}
*/
ipcMain.on('windowMinSize', (event, args) => {
const win = BrowserWindow.fromWebContents(event.sender);
if (win) {
win.setMinimumSize(args.minWidth || win.getMinimumSize()[0], args.minHeight || win.getMinimumSize()[1])
}
event.returnValue = "ok"
})
/**
* 设置窗口最大尺寸
* @param args {maxWidth, maxHeight}
*/
ipcMain.on('windowMaxSize', (event, args) => {
const win = BrowserWindow.fromWebContents(event.sender);
if (win) {
win.setMaximumSize(args.maxWidth || win.getMaximumSize()[0], args.maxHeight || win.getMaximumSize()[1])
}
event.returnValue = "ok"
})
/**
* 窗口居中
*/
ipcMain.on('windowCenter', (event) => {
const win = BrowserWindow.fromWebContents(event.sender);
if (win) {
win.center();
}
event.returnValue = "ok"
})
/**
* 窗口最大化或恢复
*/
ipcMain.on('windowMax', (event) => {
const win = BrowserWindow.fromWebContents(event.sender);
if (win.isMaximized()) {
win.restore();
} else {
win.maximize();
}
event.returnValue = "ok"
})
/**
* 给主窗口发送信息
* @param args {channel, data}
*/
ipcMain.on('sendForwardMain', (event, args) => {
if (mainWindow) {
mainWindow.webContents.send(args.channel, args.data)
}
event.returnValue = "ok"
})
/**
* 设置Dock标记
* @param args
*/
ipcMain.on('setDockBadge', (event, args) => {
if(process.platform !== 'darwin'){
// Mac only
return;
}
let num = args;
let tray = true;
if (utils.isJson(args)) {
num = args.num
tray = !!args.tray
}
let text = utils.runNum(num) > 0 ? String(num) : ""
app.dock.setBadge(text)
if (tray && mainTray) {
mainTray.setTitle(text)
}
event.returnValue = "ok"
})
//================================================================
// Update
//================================================================
let autoUpdating = 0
autoUpdater.logger = log
autoUpdater.autoDownload = false
autoUpdater.on('update-available', info => {
mainWindow.webContents.send("updateAvailable", info)
})
autoUpdater.on('update-downloaded', info => {
mainWindow.webContents.send("updateDownloaded", info)
})
/**
* 检查更新
*/
ipcMain.on('updateCheckAndDownload', (event, args) => {
event.returnValue = "ok"
if (autoUpdating + 3600 > utils.Time()) {
return // 限制1小时仅执行一次
}
if (args.provider) {
autoUpdater.setFeedURL(args)
}
autoUpdater.checkForUpdates().then(info => {
if (utils.compareVersion(config.version, info.updateInfo.version) >= 0) {
return
}
if (args.apiVersion) {
if (utils.compareVersion(info.updateInfo.version, args.apiVersion) === 0) {
autoUpdating = utils.Time()
autoUpdater.downloadUpdate().then(_ => {}).catch(_ => {})
}
} else {
autoUpdating = utils.Time()
autoUpdater.downloadUpdate().then(_ => {}).catch(_ => {})
}
})
})
/**
* 退出并安装更新
*/
ipcMain.on('updateQuitAndInstall', (event) => {
event.returnValue = "ok"
willQuitApp = true
setTimeout(() => autoUpdater.quitAndInstall(), 1)
})
//================================================================
// Pdf export
//================================================================
const MICRON_TO_PIXEL = 264.58 //264.58 micron = 1 pixel
const PNG_CHUNK_IDAT = 1229209940;
const LARGE_IMAGE_AREA = 30000000;
//NOTE: Key length must not be longer than 79 bytes (not checked)
function writePngWithText(origBuff, key, text, compressed, base64encoded) {
let isDpi = key == 'dpi';
let inOffset = 0;
let outOffset = 0;
let data = text;
let dataLen = isDpi ? 9 : key.length + data.length + 1; //we add 1 zeros with non-compressed data, for pHYs it's 2 of 4-byte-int + 1 byte
//prepare compressed data to get its size
if (compressed) {
data = zlib.deflateRawSync(encodeURIComponent(text));
dataLen = key.length + data.length + 2; //we add 2 zeros with compressed data
}
let outBuff = Buffer.allocUnsafe(origBuff.length + dataLen + 4); //4 is the header size "zTXt", "tEXt" or "pHYs"
try {
let magic1 = origBuff.readUInt32BE(inOffset);
inOffset += 4;
let magic2 = origBuff.readUInt32BE(inOffset);
inOffset += 4;
if (magic1 != 0x89504e47 && magic2 != 0x0d0a1a0a) {
throw new Error("PNGImageDecoder0");
}
outBuff.writeUInt32BE(magic1, outOffset);
outOffset += 4;
outBuff.writeUInt32BE(magic2, outOffset);
outOffset += 4;
} catch (e) {
log.error(e.message, {stack: e.stack});
throw new Error("PNGImageDecoder1");
}
try {
while (inOffset < origBuff.length) {
let length = origBuff.readInt32BE(inOffset);
inOffset += 4;
let type = origBuff.readInt32BE(inOffset)
inOffset += 4;
if (type == PNG_CHUNK_IDAT) {
// Insert zTXt chunk before IDAT chunk
outBuff.writeInt32BE(dataLen, outOffset);
outOffset += 4;
let typeSignature = isDpi ? 'pHYs' : (compressed ? "zTXt" : "tEXt");
outBuff.write(typeSignature, outOffset);
outOffset += 4;
if (isDpi) {
let dpm = Math.round(parseInt(text) / 0.0254) || 3937; //One inch is equal to exactly 0.0254 meters. 3937 is 100dpi
outBuff.writeInt32BE(dpm, outOffset);
outBuff.writeInt32BE(dpm, outOffset + 4);
outBuff.writeInt8(1, outOffset + 8);
outOffset += 9;
data = Buffer.allocUnsafe(9);
data.writeInt32BE(dpm, 0);
data.writeInt32BE(dpm, 4);
data.writeInt8(1, 8);
} else {
outBuff.write(key, outOffset);
outOffset += key.length;
outBuff.writeInt8(0, outOffset);
outOffset++;
if (compressed) {
outBuff.writeInt8(0, outOffset);
outOffset++;
data.copy(outBuff, outOffset);
} else {
outBuff.write(data, outOffset);
}
outOffset += data.length;
}
let crcVal = 0xffffffff;
crcVal = crc.crcjam(typeSignature, crcVal);
crcVal = crc.crcjam(data, crcVal);
// CRC
outBuff.writeInt32BE(crcVal ^ 0xffffffff, outOffset);
outOffset += 4;
// Writes the IDAT chunk after the zTXt
outBuff.writeInt32BE(length, outOffset);
outOffset += 4;
outBuff.writeInt32BE(type, outOffset);
outOffset += 4;
origBuff.copy(outBuff, outOffset, inOffset);
// Encodes the buffer using base64 if requested
return base64encoded ? outBuff.toString('base64') : outBuff;
}
outBuff.writeInt32BE(length, outOffset);
outOffset += 4;
outBuff.writeInt32BE(type, outOffset);
outOffset += 4;
origBuff.copy(outBuff, outOffset, inOffset, inOffset + length + 4);// +4 to move past the crc
inOffset += length + 4;
outOffset += length + 4;
}
} catch (e) {
log.error(e.message, {stack: e.stack});
throw e;
}
}
//TODO Create a lightweight html file similar to export3.html for exporting to vsdx
function exportVsdx(event, args, directFinalize) {
let win = new BrowserWindow({
width: 1280,
height: 800,
show: false,
webPreferences: {
preload: path.join(__dirname, 'electron-preload.js'),
webSecurity: true,
nodeIntegration: true,
contextIsolation: true,
nativeWindowOpen: true
},
})
let loadEvtCount = 0;
function loadFinished() {
loadEvtCount++;
if (loadEvtCount == 2) {
win.webContents.send('export-vsdx', args);
ipcMain.once('export-vsdx-finished', (evt, data) => {
let hasError = false;
if (data == null) {
hasError = true;
}
//Set finalize here since it is call in the reply below
function finalize() {
win.destroy();
}
if (directFinalize === true) {
event.finalize = finalize;
} else {
//Destroy the window after response being received by caller
ipcMain.once('export-finalize', finalize);
}
if (hasError) {
event.reply('export-error');
} else {
event.reply('export-success', data);
}
});
}
}
//Order of these two events is not guaranteed, so wait for them async.
//TOOD There is still a chance we catch another window 'app-load-finished' if user created multiple windows quickly
ipcMain.once('app-load-finished', loadFinished);
win.webContents.on('did-finish-load', loadFinished);
}
async function mergePdfs(pdfFiles, xml) {
//Pass throgh single files
if (pdfFiles.length == 1 && xml == null) {
return pdfFiles[0];
}
try {
const pdfDoc = await PDFDocument.create();
pdfDoc.setCreator(config.name);
if (xml != null) {
//Embed diagram XML as file attachment
await pdfDoc.attach(Buffer.from(xml).toString('base64'), config.name + '.xml', {
mimeType: 'application/vnd.jgraph.mxfile',
description: config.name + ' Content'
});
}
for (let i = 0; i < pdfFiles.length; i++) {
const pdfFile = await PDFDocument.load(pdfFiles[i].buffer);
const pages = await pdfDoc.copyPages(pdfFile, pdfFile.getPageIndices());
pages.forEach(p => pdfDoc.addPage(p));
}
const pdfBytes = await pdfDoc.save();
return Buffer.from(pdfBytes);
} catch (e) {
throw new Error('Error during PDF combination: ' + e.message);
}
}
//TODO Use canvas to export images if math is not used to speedup export (no capturePage). Requires change to export3.html also
function exportDiagram(event, args, directFinalize) {
if (args.format == 'vsdx') {
exportVsdx(event, args, directFinalize);
return;
}
let browser = null;
try {
browser = new BrowserWindow({
webPreferences: {
preload: path.join(__dirname, 'electron-preload.js'),
backgroundThrottling: false,
contextIsolation: true,
nativeWindowOpen: true
},
show: false,
frame: false,
enableLargerThanScreen: true,
transparent: args.format == 'png' && (args.bg == null || args.bg == 'none'),
});
browser.loadURL(`file://${__dirname}/export3.html`);
const contents = browser.webContents;
let pageByPage = (args.format == 'pdf' && !args.print), from, to, pdfs;
if (pageByPage) {
from = args.allPages ? 0 : parseInt(args.from || 0);
to = args.allPages ? 1000 : parseInt(args.to || 1000) + 1; //The 'to' will be corrected later
pdfs = [];
args.from = from;
args.to = from;
args.allPages = false;
}
contents.on('did-finish-load', function () {
//Set finalize here since it is call in the reply below
function finalize() {
browser.destroy();
}
if (directFinalize === true) {
event.finalize = finalize;
} else {
//Destroy the window after response being received by caller
ipcMain.once('export-finalize', finalize);
}
function renderingFinishHandler(evt, renderInfo) {
if (renderInfo == null) {
event.reply('export-error');
return;
}
let pageCount = renderInfo.pageCount, bounds = null;
//For some reason, Electron 9 doesn't send this object as is without stringifying. Usually when variable is external to function own scope
try {
bounds = JSON.parse(renderInfo.bounds);
} catch (e) {
bounds = null;
}
let pdfOptions = {pageSize: 'A4'};
let hasError = false;
if (bounds == null || bounds.width < 5 || bounds.height < 5) //very small page size never return from printToPDF
{
//A workaround to detect errors in the input file or being empty file
hasError = true;
} else {
//Chrome generates Pdf files larger than requested pixels size and requires scaling
let fixingScale = 0.959;
let w = Math.ceil(bounds.width * fixingScale);
// +0.1 fixes cases where adding 1px below is not enough
// Increase this if more cropped PDFs have extra empty pages
let h = Math.ceil(bounds.height * fixingScale + 0.1);
pdfOptions = {
printBackground: true,
pageSize: {
width: w * MICRON_TO_PIXEL,
height: (h + 2) * MICRON_TO_PIXEL //the extra 2 pixels to prevent adding an extra empty page
},
marginsType: 1 // no margin
}
}
let base64encoded = args.base64 == '1';
if (hasError) {
event.reply('export-error');
} else if (args.format == 'png' || args.format == 'jpg' || args.format == 'jpeg') {
//Adds an extra pixel to prevent scrollbars from showing
let newBounds = {
width: Math.ceil(bounds.width + bounds.x) + 1,
height: Math.ceil(bounds.height + bounds.y) + 1
};
browser.setBounds(newBounds);
//TODO The browser takes sometime to show the graph (also after resize it takes some time to render)
// 1 sec is most probably enough (for small images, 5 for large ones) BUT not a stable solution
setTimeout(function () {
browser.capturePage().then(function (img) {
//Image is double the given bounds, so resize is needed!
let tScale = 1;
//If user defined width and/or height, enforce it precisely here. Height override width
if (args.h) {
tScale = args.h / newBounds.height;
} else if (args.w) {
tScale = args.w / newBounds.width;
}
newBounds.width *= tScale;
newBounds.height *= tScale;
img = img.resize(newBounds);
let data = args.format == 'png' ? img.toPNG() : img.toJPEG(args.jpegQuality || 90);
if (args.dpi != null && args.format == 'png') {
data = writePngWithText(data, 'dpi', args.dpi);
}
if (args.embedXml == "1" && args.format == 'png') {
data = writePngWithText(data, "mxGraphModel", args.xml, true,
base64encoded);
} else {
if (base64encoded) {
data = data.toString('base64');
}
}
event.reply('export-success', data);
});
}, bounds.width * bounds.height < LARGE_IMAGE_AREA ? 1000 : 5000);
} else if (args.format == 'pdf') {
if (args.print) {
pdfOptions = {
scaleFactor: args.pageScale,
printBackground: true,
pageSize: {
width: args.pageWidth * MICRON_TO_PIXEL,
//This height adjustment fixes the output. TODO Test more cases
height: (args.pageHeight * 1.025) * MICRON_TO_PIXEL
},
marginsType: 1 // no margin
};
contents.print(pdfOptions, (success, errorType) => {
//Consider all as success
event.reply('export-success', {});
});
} else {
contents.printToPDF(pdfOptions).then(async (data) => {
pdfs.push(data);
to = to > pageCount ? pageCount : to;
from++;
if (from < to) {
args.from = from;
args.to = from;
ipcMain.once('render-finished', renderingFinishHandler);
contents.send('render', args);
} else {
data = await mergePdfs(pdfs, args.embedXml == '1' ? args.xml : null);
event.reply('export-success', data);
}
})
.catch((error) => {
event.reply('export-error', error);
});
}
} else if (args.format == 'svg') {
contents.send('get-svg-data');
ipcMain.once('svg-data', (evt, data) => {
event.reply('export-success', data);
});
} else {
event.reply('export-error', 'Error: Unsupported format');
}
}
ipcMain.once('render-finished', renderingFinishHandler);
if (args.format == 'xml') {
ipcMain.once('xml-data', (evt, data) => {
event.reply('export-success', data);
});
ipcMain.once('xml-data-error', () => {
event.reply('export-error');
});
}
args.border = args.border || 0;
args.scale = args.scale || 1;
contents.send('render', args);
});
} catch (e) {
if (browser != null) {
browser.destroy();
}
event.reply('export-error', e);
console.log('export-error', e);
}
}
ipcMain.on('export', exportDiagram);
//================================================================
// Renderer Helper functions
//================================================================
const {COPYFILE_EXCL} = fs.constants;
const DRAFT_PREFEX = '~$';
const DRAFT_EXT = '.dtmp';
const BKP_PREFEX = '~$';
const BKP_EXT = '.bkp';
function isConflict(origStat, stat) {
return stat != null && origStat != null && stat.mtimeMs != origStat.mtimeMs;
}
function getDraftFileName(fileObject) {
let filePath = fileObject.path;
let draftFileName = '', counter = 1, uniquePart = '';
do {
draftFileName = path.join(path.dirname(filePath), DRAFT_PREFEX + path.basename(filePath) + uniquePart + DRAFT_EXT);
uniquePart = '_' + counter++;
} while (fs.existsSync(draftFileName));
return draftFileName;
}
async function getFileDrafts(fileObject) {
let filePath = fileObject.path;
let draftsPaths = [], drafts = [], draftFileName, counter = 1, uniquePart = '';
do {
draftsPaths.push(draftFileName);
draftFileName = path.join(path.dirname(filePath), DRAFT_PREFEX + path.basename(filePath) + uniquePart + DRAFT_EXT);
uniquePart = '_' + counter++;
} while (fs.existsSync(draftFileName)); //TODO this assume continuous drafts names
for (let i = 1; i < draftsPaths.length; i++) {
try {
let stat = await fsProm.lstat(draftsPaths[i]);
drafts.push({
data: await fsProm.readFile(draftsPaths[i], 'utf8'),
created: stat.ctimeMs,
modified: stat.mtimeMs,
path: draftsPaths[i]
});
} catch (e) {
} // Ignore
}
return drafts;
}
async function saveDraft(fileObject, data) {
if (data == null || data.length == 0) {
throw new Error('empty data');
} else {
let draftFileName = fileObject.draftFileName || getDraftFileName(fileObject);
await fsProm.writeFile(draftFileName, data, 'utf8');
return draftFileName;
}
}
async function saveFile(fileObject, data, origStat, overwrite, defEnc) {
let retryCount = 0;
let backupCreated = false;
let bkpPath = path.join(path.dirname(fileObject.path), BKP_PREFEX + path.basename(fileObject.path) + BKP_EXT);
let writeFile = async function () {
if (data == null || data.length == 0) {
throw new Error('empty data');
} else {
let writeEnc = defEnc || fileObject.encoding;
await fsProm.writeFile(fileObject.path, data, writeEnc);
let stat2 = await fsProm.stat(fileObject.path);
let writtenData = await fsProm.readFile(fileObject.path, writeEnc);
if (data != writtenData) {
retryCount++;
if (retryCount < 3) {
return await writeFile();
} else {
throw new Error('all saving trials failed');
}
} else {
if (backupCreated) {
fs.unlink(bkpPath, (err) => {
}); //Ignore errors!
}
return stat2;
}
}
};
async function doSaveFile() {
try {
await fsProm.copyFile(fileObject.path, bkpPath, COPYFILE_EXCL);
backupCreated = true;
} catch (e) {
} //Ignore
return await writeFile();
}
if (overwrite) {
return await doSaveFile();
} else {
let stat = fs.existsSync(fileObject.path) ?
await fsProm.stat(fileObject.path) : null;
if (stat && isConflict(origStat, stat)) {
new Error('conflict');
} else {
return await doSaveFile();
}
}
}
async function writeFile(path, data, enc) {
return await fsProm.writeFile(path, data, enc);