55 lines
2.9 KiB
Markdown
55 lines
2.9 KiB
Markdown
|
streamroller
|
||
|
|
============
|
||
|
|
|
||
|
|
node.js file streams that roll over when they reach a maximum size, or a date/time.
|
||
|
|
|
||
|
|
npm install streamroller
|
||
|
|
|
||
|
|
## usage
|
||
|
|
|
||
|
|
var rollers = require('streamroller');
|
||
|
|
var stream = new rollers.RollingFileStream('myfile', 1024, 3);
|
||
|
|
stream.write("stuff");
|
||
|
|
stream.end();
|
||
|
|
|
||
|
|
The streams behave the same as standard node.js streams, except that when certain conditions are met they will rename the current file to a backup and start writing to a new file.
|
||
|
|
|
||
|
|
### new RollingFileStream(filename [, maxSize, numBackups, options])
|
||
|
|
* `filename` (String)
|
||
|
|
* `maxSize` - the size in bytes to trigger a rollover, if not provided this defaults to MAX_SAFE_INTEGER and the stream will not roll.
|
||
|
|
* `numBackups` - the number of old files to keep
|
||
|
|
* `options` - Object
|
||
|
|
* `encoding` - defaults to 'utf8'
|
||
|
|
* `mode` - defaults to 0644
|
||
|
|
* `flags` - defaults to 'a'
|
||
|
|
* `compress` - (boolean) defaults to `false` - compress the backup files using gzip (files will have `.gz` extension).
|
||
|
|
|
||
|
|
This returns a `WritableStream`. When the current file being written to (given by `filename`) gets up to or larger than `maxSize`, then the current file will be renamed to `filename.1` and a new file will start being written to. Up to `numBackups` of old files are maintained, so if `numBackups` is 3 then there will be 4 files:
|
||
|
|
<pre>
|
||
|
|
filename
|
||
|
|
filename.1
|
||
|
|
filename.2
|
||
|
|
filename.3
|
||
|
|
</pre>
|
||
|
|
When filename size >= maxSize then:
|
||
|
|
<pre>
|
||
|
|
filename -> filename.1
|
||
|
|
filename.1 -> filename.2
|
||
|
|
filename.2 -> filename.3
|
||
|
|
filename.3 gets overwritten
|
||
|
|
filename is a new file
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
### new DateRollingFileStream(filename, pattern, options)
|
||
|
|
* `filename` (String)
|
||
|
|
* `pattern` (String) - the date pattern to trigger rolling (see below)
|
||
|
|
* `options` - Object
|
||
|
|
* `encoding` - defaults to 'utf8'
|
||
|
|
* `mode` defaults to 0644
|
||
|
|
* `flags` defaults to 'a'
|
||
|
|
* `compress` - (boolean) compress the backup files, defaults to false
|
||
|
|
* `alwaysIncludePattern` - (boolean) extend the initial file with the pattern, defaults to false
|
||
|
|
|
||
|
|
|
||
|
|
This returns a `WritableStream`. When the current time, formatted as `pattern`, changes then the current file will be renamed to `filename.formattedDate` where `formattedDate` is the result of processing the date through the pattern, and a new file will begin to be written. Streamroller uses [date-format](http://github.com/nomiddlename/date-format) to format dates, and the `pattern` should use the date-format format. e.g. with a `pattern` of `"yyyy-MM-dd"`, and assuming today is August 29, 2013 then writing to the stream today will just write to `filename`. At midnight, `filename` will be renamed to `filename.2013-08-29` and a new `filename` will be created. If `options.alwaysIncludePattern` is true, then the initial file will be `filename.2013-08-29` and no renaming will occur at midnight, but a new file will be written to with the name `filename.2013-08-30`.
|