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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package request // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/request"
import (
"io"
"sync"
)
var _ io.ReadCloser = &BodyWrapper{}
// BodyWrapper wraps a http.Request.Body (an io.ReadCloser) to track the number
// of bytes read and the last error.
type BodyWrapper struct {
io.ReadCloser
OnRead func(n int64) // must not be nil
mu sync.Mutex
read int64
err error
}
// NewBodyWrapper creates a new BodyWrapper.
//
// The onRead attribute is a callback that will be called every time the data
// is read, with the number of bytes being read.
func NewBodyWrapper(body io.ReadCloser, onRead func(int64)) *BodyWrapper {
return &BodyWrapper{
ReadCloser: body,
OnRead: onRead,
}
}
// Read reads the data from the io.ReadCloser, and stores the number of bytes
// read and the error.
func (w *BodyWrapper) Read(b []byte) (int, error) {
n, err := w.ReadCloser.Read(b)
n1 := int64(n)
w.updateReadData(n1, err)
w.OnRead(n1)
return n, err
}
func (w *BodyWrapper) updateReadData(n int64, err error) {
w.mu.Lock()
defer w.mu.Unlock()
w.read += n
if err != nil {
w.err = err
}
}
// Closes closes the io.ReadCloser.
func (w *BodyWrapper) Close() error {
return w.ReadCloser.Close()
}
// BytesRead returns the number of bytes read up to this point.
func (w *BodyWrapper) BytesRead() int64 {
w.mu.Lock()
defer w.mu.Unlock()
return w.read
}
// Error returns the last error.
func (w *BodyWrapper) Error() error {
w.mu.Lock()
defer w.mu.Unlock()
return w.err
}
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