/
logRoundTrip.go
61 lines (49 loc) · 1.49 KB
/
logRoundTrip.go
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package http
import (
"fmt"
"io"
"net/http"
"net/http/httputil"
"github.com/pkg/errors"
)
type (
// LogRoundTripper is a drop-in for the Transport of a http.Client
// which then will log requests and responses to the given writer
// (os.Stdout / os.Stderr / logrus writer / ...)
LogRoundTripper struct {
next http.RoundTripper
output io.Writer
}
)
var _ http.RoundTripper = LogRoundTripper{}
// NewLogRoundTripper creates a new LogRoundTripper with the given
// next transport and output writer. If no next transport is given
// (next == nil) the http.DefaultTransport is used. If no writer
// is given the io.Discard writer is used.
func NewLogRoundTripper(next http.RoundTripper, out io.Writer) LogRoundTripper {
if next == nil {
next = http.DefaultTransport
}
if out == nil {
// Makes no sense but ensures we don't fail writing to nil
out = io.Discard
}
return LogRoundTripper{next, out}
}
// RoundTrip implements http.RoundTripper interface
func (l LogRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
dump, err := httputil.DumpRequest(req, true)
if err != nil {
return nil, errors.Wrap(err, "dumping request")
}
fmt.Fprintf(l.output, "---- 8< REQ >8 ----\n%s", dump)
resp, err := l.next.RoundTrip(req)
if err != nil {
return resp, err
}
if dump, err = httputil.DumpResponse(resp, true); err != nil {
return nil, errors.Wrap(err, "dumping response")
}
fmt.Fprintf(l.output, "---- 8< RES >8 ----\n%s---- 8< END >8 ----\n", dump)
return resp, err
}