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https://github.com/satyrius/gonx

Nginx access log parser for Golang
https://github.com/satyrius/gonx

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Nginx access log parser for Golang

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# gonx [![Build Status](https://travis-ci.org/satyrius/gonx.svg)](https://travis-ci.org/satyrius/gonx) [![Go Report Card](https://goreportcard.com/badge/github.com/satyrius/gonx)](https://goreportcard.com/report/github.com/satyrius/gonx)



`gonx` is Nginx access log reader library for `Go`. In fact you can use it for any format.



## New owner needed 🙌

 

I am not using golang as often as I used to, which makes the maintenance of this library an issue. I'll gladly share the ownership with anyone eager to maintain and evolve it.



## Usage



The library provides `Reader` type and two constructors for it.



Common constructor `NewReader` gets opened file (any `io.Reader` in fact) and log format of type `string` as argumets.

[Format](#format) is in form os nginx `log_format` string.



```go

reader := gonx.NewReader(file, format)

```



`NewNginxReader` provides more magic. It gets log file `io.Reader`, nginx config file `io.Reader`

and `log_format` name `string` as a third. The actual format for `Parser` will be extracted from

given nginx config.



```go

reader := gonx.NewNginxReader(file, nginxConfig, format_name)

```



`Reader` implements `io.Reader`. Here is example usage



```go

for {

	rec, err := reader.Read()

	if err == io.EOF {

		break

	}

	// Process the record... e.g.

}

```



See more examples in `example/*.go` sources.



## Performance



NOTE All benchmarks was made on my old *11" MacBook Air 2011*, so you should get the better results for your brand new hardware ;-)



I have a few benchmarks for parsing `string` log record into `Entry` using `gonx.Parser`



	BenchmarkParseSimpleLogRecord      100000            19457 ns/op

	BenchmarkParseLogRecord             20000            84425 ns/op



And here is some real wold stats. I got ~300Mb log file with ~700K records and process with [simple scripts](https://github.com/satyrius/gonx/tree/master/benchmarks).



* Reading whole file line by line with `bufio.Scanner` without any other processing takes a *one second*.

* Read in the same manner plus parsing with `gonx.Parser` takes *about 80 seconds*

* But for reading this file with `gonx.Reader` which parses records using separate goroutines it takes *about 45 seconds* (but I want to make it faster)



## Format



As I said above this library is primary for nginx access log parsing, but it can be configured to parse any

other format. `NewReader` accepts `format` argument, it will be transformed to regular expression and used

for log line by line parsing. Format is nginx-like, here is example



	`$remote_addr [$time_local] "$request"`



It should contain variables in form `$name`. The regular expression will be created using this string

format representation



	`^(?P[^ ]+) \[(?P[^]]+)\] "(?P[^"]+)"$`



`Reader.Read` returns a record of type `Entry` (which is customized `map[string][string]`). For this example

the returned record map will contain `remote_addr`, `time_local` and `request` keys filled with parsed values.



## Stability



This library API and internal representation can be changed at any moment, but I guarantee that backward

capability will be supported for the following public interfaces.



* `func NewReader(logFile io.Reader, format string) *Reader`

* `func NewNginxReader(logFile io.Reader, nginxConf io.Reader, formatName string) (reader *Reader, err error)`

* `func (r *Reader) Read() (record Entry, err error)`



## Changelog



All major changes will be noticed in [release notes](https://github.com/satyrius/gonx/releases).



## Roadmap



I have no roadmap for this project at the moment for a few reasons. At the first, it is a simple library and I want to keep it. At the second, there is no feature requests, and for me, this library do its job. A few things may happen: the default binary, to use this not only as a library, and performance improvements if they will be needed.



## Contributing



Fork the repo, create a feature branch then send me pull request. Feel free to create new issues or contact me using email.