https://github.com/rosbit/reader-logger

a utility to output the reader content and process it simultaneously.
https://github.com/rosbit/reader-logger

Last synced: about 6 hours ago
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a utility to output the reader content and process it simultaneously.

• Host: GitHub
• URL: https://github.com/rosbit/reader-logger
• Owner: rosbit
• License: mit
• Created: 2022-12-16T00:21:04.000Z (almost 2 years ago)
• Default Branch: master
• Last Pushed: 2023-10-29T02:43:15.000Z (about 1 year ago)
• Last Synced: 2023-10-29T03:23:18.957Z (about 1 year ago)
• Language: Go
• Size: 2.93 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# reader-logger, a utility to output the reader content and process it simultaneously.

## usage

```go

import (

	logr "github.com/rosbit/reader-logger"

	"encoding/json"

	"bytes"

	"os"

	"io"

	"fmt"

)

func main() {

	// a reader for testing

	reader := bytes.NewBufferString(`{"name":"rosbit", "age": 10}`)

	// j to store the result

	var j struct {

		Name string `json:"name"`

		Age int `json:"age"`

	}

	if err := parseJSON(reader, &j); err != nil {

		fmt.Printf("err: %v\n", err)

		return

	}

	fmt.Printf("result: %v\n", j)

}

// print the content in reader and parse it.

func parseJSON(reader io.Reader, j interface{}) error {

	r, deferFunc := logr.ReaderLogger(reader, os.Stderr, "data in reader") // create a new reader

	defer deferFunc()

	return json.NewDecoder(r).Decode(j) // parse JSON in the new reader

}

```

## result

run `go test`, the result is as following:

```

--- data in reader begin ---

{"name":"rosbit", "age": 10}

--- data in reader end ---

result: {rosbit 10}

PASS

ok  	github.com/rosbit/reader-logger	0.685s

```

you can output the content of reader in any io.Writer other than os.Stderr as in the sample, of course.