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https://github.com/aaronvb/logrequest

Go HTTP request middleware that logs started and completed info, inspired by Ruby on Rails logging.
https://github.com/aaronvb/logrequest

benchmark go golang http logging logrequest middleware rails-log requests

Last synced: 27 days ago
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Go HTTP request middleware that logs started and completed info, inspired by Ruby on Rails logging.

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# logrequest
[![go.dev Reference](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat)](https://pkg.go.dev/github.com/aaronvb/logrequest) [![GitHub Workflow Status (with event)](https://img.shields.io/github/actions/workflow/status/aaronvb/logrequest/go.yml?label=tests)](https://github.com/aaronvb/logrequest/actions/workflows/go.yml)

This is a Go middleware log output inspired by the Ruby on Rails log output for requests. Example output:

```sh
Started GET "/" 127.0.0.1:12345 HTTP/1.1
Completed 200 in 3.7455ms
```

## Install
```sh
go get -u github.com/aaronvb/logrequest
```

## Using logrequest
The three ways you can have logrequest return request data:

- `ToLogger(logger *log.Logger)` directly sends to a `log.Logger`.
- `ToString()` returns a `map[string]string` with the key `started` and `completed`.
- `ToFields()` returns a `RequestFields` struct that contains the fields in the request. (See below)
```go
type RequestFields struct {
Method string
Url string
RemoteAddress string
Protocol string
Time time.Time
Duration time.Duration
StatusCode int
}
```

## Options
There are two optional options you can pass to the `LogRequest` struct:

#### `NewLine` (integer) - This will append N lines at the end of the log output. Note: This only works with logger output.

Example:
```go
lr := logrequest.LogRequest{Request: r, Writer: w, Handler: next, NewLine: 2}
```
```
Started GET "/" 127.0.0.1:12345 HTTP/1.1
Completed 200 in 3.7455ms

Started GET "/home" 127.0.0.1:12345 HTTP/1.1
Completed 200 in 1.891ms
```

#### `Timestamp` (boolean) - This will add a timestamp at the beginning of the request.

Example:
```go
lr := logrequest.LogRequest{Request: r, Writer: w, Handler: next, Timestamp: true}
```
```
Started GET "/home" 1.1.1.1:1234 HTTP/1.1 at 2020-05-13 02:25:33
```

#### `HideDuration` (boolean) - This will hide the duration at the end of the request.

Example:
```go
lr := logrequest.LogRequest{Request: r, Writer: w, Handler: next, Timestamp: true, HideDuration: true}
```
```
Started GET "/home" 127.0.0.1:12345 HTTP/1.1
Completed 200
```

## Middleware Example (using [gorilla/mux](https://github.com/gorilla/mux))
```go
package main

import (
"fmt"
"log"
"net/http"
"os"
"time"

"github.com/aaronvb/logrequest"

"github.com/gorilla/mux"
)

type application struct {
errorLog *log.Logger
infoLog *log.Logger
}

func main() {
infoLog := log.New(os.Stdout, "INFO\t", log.Ldate|log.Ltime)
errorLog := log.New(os.Stderr, "ERROR\t", log.Ldate|log.Ltime|log.Lshortfile)

app := &application{
errorLog: errorLog,
infoLog: infoLog,
}

srv := &http.Server{
Addr: ":8080",
ErrorLog: errorLog,
Handler: app.routes(),
}

infoLog.Printf("Starting server on %s", ":8080")
err := srv.ListenAndServe()
errorLog.Fatal(err)
}

func (app *application) routes() http.Handler {
r := mux.NewRouter()
r.HandleFunc("/foobar", app.foobar).Methods("GET")

// Middleware
r.Use(app.logRequest)

return r
}

func (app *application) foobar(w http.ResponseWriter, r *http.Request) {
time.Sleep(300 * time.Millisecond)
fmt.Fprintln(w, "Hello world")
}

// Middleware

func (app *application) logRequest(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
lr := logrequest.LogRequest{Request: r, Writer: w, Handler: next}
lr.ToLogger(app.infoLog)
})
}
```

```sh
> go run main.go
INFO 2020/03/31 22:40:09 Starting server on :8080
INFO 2020/03/31 22:40:13 Started GET "/foobar" [::1]:55044 HTTP/1.1
INFO 2020/03/31 22:40:13 Completed 200 in 300.131639ms
INFO 2020/03/31 22:40:18 Started GET "/foobar" [::1]:55044 HTTP/1.1
INFO 2020/03/31 22:40:18 Completed 200 in 302.047625ms
```

## Showing Parameters
```sh
INFO 2020/03/31 22:40:13 Started GET "/foobar" [::1]:55044 HTTP/1.1
INFO 2020/03/31 22:40:13 Parameters: {"foo" => "bar"}
INFO 2020/03/31 22:40:13 Completed 200 in 300.131639ms
```
Check out my other middleware package to output incoming parameters, which is also influenced by the Ruby on Rails logger: [https://github.com/aaronvb/logparams](https://github.com/aaronvb/logparams)