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Edit File : README.md \| Size : 2.76 KB
write-file-atomic ----------------- This is an extension for node's `fs.writeFile` that makes its operation atomic and allows you set ownership (uid/gid of the file). ### var writeFileAtomic = require('write-file-atomic')<br>writeFileAtomic(filename, data, [options], callback) * filename String * data String \| Buffer * options Object \| String * chown Object default, uid & gid of existing file, if any * uid Number * gid Number * encoding String \| Null default = 'utf8' * fsync Boolean default = true * mode Number default, from existing file, if any * Promise Object default = native Promise object * callback Function Atomically and asynchronously writes data to a file, replacing the file if it already exists. data can be a string or a buffer. The file is initially named `filename + "." + murmurhex(__filename, process.pid, ++invocations)`. Note that `require('worker_threads').threadId` is used in addition to `process.pid` if running inside of a worker thread. If writeFile completes successfully then, if passed the chown option it will change the ownership of the file. Finally it renames the file back to the filename you specified. If it encounters errors at any of these steps it will attempt to unlink the temporary file and then pass the error back to the caller. If multiple writes are concurrently issued to the same file, the write operations are put into a queue and serialized in the order they were called, using Promises. Native promises are used by default, but you can inject your own promise-like object with the Promise option. Writes to different files are still executed in parallel. If provided, the chown option requires both uid and gid properties or else you'll get an error. If chown is not specified it will default to using the owner of the previous file. To prevent chown from being ran you can also pass `false`, in which case the file will be created with the current user's credentials. If mode is not specified, it will default to using the permissions from an existing file, if any. Expicitly setting this to `false` remove this default, resulting in a file created with the system default permissions. If options is a String, it's assumed to be the encoding option. The encoding option is ignored if data is a buffer. It defaults to 'utf8'. If the fsync option is false, writeFile will skip the final fsync call. Example: ```javascript writeFileAtomic('message.txt', 'Hello Node', {chown:{uid:100,gid:50}}, function (err) { if (err) throw err; console.log('It\'s saved!'); }); ``` ### var writeFileAtomicSync = require('write-file-atomic').sync<br>writeFileAtomicSync(filename, data, [options]) The synchronous version of writeFileAtomic. Back

Edit File : README.md | Size : 2.76 KB

write-file-atomic
-----------------

This is an extension for node's `fs.writeFile` that makes its operation
atomic and allows you set ownership (uid/gid of the file).

### var writeFileAtomic = require('write-file-atomic')<br>writeFileAtomic(filename, data, [options], callback)

* filename **String**
* data **String** | **Buffer**
* options **Object** | **String**
  * chown **Object** default, uid & gid of existing file, if any
    * uid **Number**
    * gid **Number**
  * encoding **String** | **Null** default = 'utf8'
  * fsync **Boolean** default = true
  * mode **Number** default, from existing file, if any
  * Promise **Object** default = native Promise object
* callback **Function**

Atomically and asynchronously writes data to a file, replacing the file if it already
exists.  data can be a string or a buffer.

The file is initially named `filename + "." + murmurhex(__filename, process.pid, ++invocations)`.
Note that `require('worker_threads').threadId` is used in addition to `process.pid` if running inside of a worker thread.
If writeFile completes successfully then, if passed the **chown** option it will change
the ownership of the file. Finally it renames the file back to the filename you specified. If
it encounters errors at any of these steps it will attempt to unlink the temporary file and then
pass the error back to the caller.
If multiple writes are concurrently issued to the same file, the write operations are put into a queue and serialized in the order they were called, using Promises. Native promises are used by default, but you can inject your own promise-like object with the **Promise** option. Writes to different files are still executed in parallel.

If provided, the **chown** option requires both **uid** and **gid** properties or else
you'll get an error.  If **chown** is not specified it will default to using
the owner of the previous file.  To prevent chown from being ran you can
also pass `false`, in which case the file will be created with the current user's credentials.

If **mode** is not specified, it will default to using the permissions from
an existing file, if any.  Expicitly setting this to `false` remove this default, resulting
in a file created with the system default permissions.

If options is a String, it's assumed to be the **encoding** option. The **encoding** option is ignored if **data** is a buffer. It defaults to 'utf8'.

If the **fsync** option is **false**, writeFile will skip the final fsync call.

Example:

```javascript
writeFileAtomic('message.txt', 'Hello Node', {chown:{uid:100,gid:50}}, function (err) {
  if (err) throw err;
  console.log('It\'s saved!');
});
```

### var writeFileAtomicSync = require('write-file-atomic').sync<br>writeFileAtomicSync(filename, data, [options])

The synchronous version of **writeFileAtomic**.

Back