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https://github.com/miolini/datacounter

Golang counters for readers/writers
https://github.com/miolini/datacounter

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Golang counters for readers/writers

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# Datacounter



Golang counters for readers/writers.



[![Build Status](https://travis-ci.org/miolini/datacounter.svg)](https://travis-ci.org/miolini/datacounter) [![GoDoc](https://godoc.org/github.com/miolini/datacounter?status.svg)](http://godoc.org/github.com/miolini/datacounter)



## Examples



### ReaderCounter



```go

buf := bytes.Buffer{}

buf.Write(data)

counter := datacounter.NewReaderCounter(&buf)



io.Copy(ioutil.Discard, counter)

if counter.Count() != dataLen {

	t.Fatalf("count mismatch len of test data: %d != %d", counter.Count(), len(data))

}

```



### WriterCounter



```go

buf := bytes.Buffer{}

counter := datacounter.NewWriterCounter(&buf)



counter.Write(data)

if counter.Count() != dataLen {

	t.Fatalf("count mismatch len of test data: %d != %d", counter.Count(), len(data))

}

```



### http.ResponseWriter Counter



```go

handler := func(w http.ResponseWriter, r *http.Request) {

	w.Write(data)

}



req, err := http.NewRequest("GET", "http://example.com/foo", nil)

if err != nil {

	t.Fatal(err)

}



w := httptest.NewRecorder()

counter := datacounter.NewResponseWriterCounter(w)



handler(counter, req)

if counter.Count() != dataLen {

	t.Fatalf("count mismatch len of test data: %d != %d", counter.Count(), len(data))

}

```