This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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129 lines
3.8 KiB
129 lines
3.8 KiB
'use strict' |
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module.exports = writeFile |
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module.exports.sync = writeFileSync |
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module.exports._getTmpname = getTmpname // for testing |
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var fs = require('graceful-fs') |
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var chain = require('slide').chain |
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var MurmurHash3 = require('imurmurhash') |
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var extend = Object.assign || require('util')._extend |
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var invocations = 0 |
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function getTmpname (filename) { |
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return filename + '.' + |
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MurmurHash3(__filename) |
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.hash(String(process.pid)) |
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.hash(String(++invocations)) |
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.result() |
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} |
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function writeFile (filename, data, options, callback) { |
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if (options instanceof Function) { |
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callback = options |
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options = null |
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} |
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if (!options) options = {} |
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fs.realpath(filename, function (_, realname) { |
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_writeFile(realname || filename, data, options, callback) |
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}) |
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} |
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function _writeFile (filename, data, options, callback) { |
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var tmpfile = getTmpname(filename) |
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if (options.mode && options.chown) { |
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return thenWriteFile() |
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} else { |
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// Either mode or chown is not explicitly set |
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// Default behavior is to copy it from original file |
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return fs.stat(filename, function (err, stats) { |
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if (err || !stats) return thenWriteFile() |
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options = extend({}, options) |
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if (!options.mode) { |
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options.mode = stats.mode |
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} |
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if (!options.chown && process.getuid) { |
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options.chown = { uid: stats.uid, gid: stats.gid } |
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} |
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return thenWriteFile() |
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}) |
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} |
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function thenWriteFile () { |
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chain([ |
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[writeFileAsync, tmpfile, data, options.mode, options.encoding || 'utf8'], |
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options.chown && [fs, fs.chown, tmpfile, options.chown.uid, options.chown.gid], |
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options.mode && [fs, fs.chmod, tmpfile, options.mode], |
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[fs, fs.rename, tmpfile, filename] |
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], function (err) { |
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err ? fs.unlink(tmpfile, function () { callback(err) }) |
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: callback() |
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}) |
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} |
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// doing this instead of `fs.writeFile` in order to get the ability to |
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// call `fsync`. |
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function writeFileAsync (file, data, mode, encoding, cb) { |
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fs.open(file, 'w', options.mode, function (err, fd) { |
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if (err) return cb(err) |
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if (Buffer.isBuffer(data)) { |
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return fs.write(fd, data, 0, data.length, 0, syncAndClose) |
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} else if (data != null) { |
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return fs.write(fd, String(data), 0, String(encoding), syncAndClose) |
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} else { |
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return syncAndClose() |
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} |
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function syncAndClose (err) { |
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if (err) return cb(err) |
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fs.fsync(fd, function (err) { |
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if (err) return cb(err) |
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fs.close(fd, cb) |
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}) |
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} |
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}) |
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} |
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} |
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function writeFileSync (filename, data, options) { |
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if (!options) options = {} |
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try { |
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filename = fs.realpathSync(filename) |
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} catch (ex) { |
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// it's ok, it'll happen on a not yet existing file |
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} |
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var tmpfile = getTmpname(filename) |
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try { |
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if (!options.mode || !options.chown) { |
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// Either mode or chown is not explicitly set |
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// Default behavior is to copy it from original file |
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try { |
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var stats = fs.statSync(filename) |
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options = extend({}, options) |
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if (!options.mode) { |
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options.mode = stats.mode |
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} |
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if (!options.chown && process.getuid) { |
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options.chown = { uid: stats.uid, gid: stats.gid } |
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} |
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} catch (ex) { |
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// ignore stat errors |
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} |
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} |
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var fd = fs.openSync(tmpfile, 'w', options.mode) |
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if (Buffer.isBuffer(data)) { |
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fs.writeSync(fd, data, 0, data.length, 0) |
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} else if (data != null) { |
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fs.writeSync(fd, String(data), 0, String(options.encoding || 'utf8')) |
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} |
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fs.fsyncSync(fd) |
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fs.closeSync(fd) |
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if (options.chown) fs.chownSync(tmpfile, options.chown.uid, options.chown.gid) |
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if (options.mode) fs.chmodSync(tmpfile, options.mode) |
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fs.renameSync(tmpfile, filename) |
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} catch (err) { |
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try { fs.unlinkSync(tmpfile) } catch (e) {} |
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throw err |
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} |
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}
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