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transport.go
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transport.go
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package requests
import (
"bufio"
"fmt"
"io"
"net/http"
"regexp"
"strings"
"time"
)
// Transport is an alias of http.RoundTripper for documentation purposes.
type Transport = http.RoundTripper
// RoundTripFunc is an adaptor to use a function as an http.RoundTripper.
type RoundTripFunc func(req *http.Request) (res *http.Response, err error)
// RoundTrip implements http.RoundTripper.
func (rtf RoundTripFunc) RoundTrip(r *http.Request) (*http.Response, error) {
return rtf(r)
}
var _ Transport = RoundTripFunc(nil)
// ReplayString returns an http.RoundTripper that always responds with a
// request built from rawResponse. It is intended for use in one-off tests.
func ReplayString(rawResponse string) Transport {
return RoundTripFunc(func(req *http.Request) (res *http.Response, err error) {
r := bufio.NewReader(strings.NewReader(rawResponse))
res, err = http.ReadResponse(r, req)
return
})
}
// UserAgentTransport returns a wrapped http.RoundTripper that sets the User-Agent header on requests to s.
func UserAgentTransport(rt http.RoundTripper, s string) Transport {
if rt == nil {
rt = http.DefaultTransport
}
return RoundTripFunc(func(req *http.Request) (res *http.Response, err error) {
r2 := *req
r2.Header = r2.Header.Clone()
r2.Header.Set("User-Agent", s)
return rt.RoundTrip(&r2)
})
}
// PermitURLTransport returns a wrapped http.RoundTripper that rejects any requests whose URL doesn't match the provided regular expression string.
//
// PermitURLTransport will panic if the regexp does not compile.
func PermitURLTransport(rt http.RoundTripper, regex string) Transport {
if rt == nil {
rt = http.DefaultTransport
}
re := regexp.MustCompile(regex)
reErr := fmt.Errorf("requested URL not permitted by regexp: %s", regex)
return RoundTripFunc(func(req *http.Request) (res *http.Response, err error) {
if u := req.URL.String(); !re.MatchString(u) {
return nil, reErr
}
return rt.RoundTrip(req)
})
}
// LogTransport returns a wrapped http.RoundTripper
// that calls fn with details when a response has finished.
// A response is considered finished
// when the wrapper http.RoundTripper returns an error
// or the Response.Body is closed,
// whichever comes first.
// To simplify logging code,
// a nil *http.Response is replaced with a new http.Response.
func LogTransport(rt http.RoundTripper, fn func(req *http.Request, res *http.Response, err error, duration time.Duration)) Transport {
if rt == nil {
rt = http.DefaultTransport
}
return RoundTripFunc(func(req *http.Request) (res *http.Response, err error) {
start := time.Now()
res, err = rt.RoundTrip(req)
if err != nil {
res2 := res
if res == nil {
res2 = new(http.Response)
}
fn(req, res2, err, time.Since(start))
return
}
res.Body = closeLogger{res.Body, func() {
fn(req, res, err, time.Since(start))
}}
return
})
}
type closeLogger struct {
io.ReadCloser
fn func()
}
func (cl closeLogger) Close() error {
cl.fn()
return cl.ReadCloser.Close()
}
// DoerTransport converts a Doer into a Transport.
// It exists for compatibility with other libraries.
// A Doer is an interface with a Do method.
// Users should prefer Transport,
// because Do is the interface of http.Client
// which has higher level concerns.
func DoerTransport(cl interface {
Do(req *http.Request) (*http.Response, error)
}) Transport {
return RoundTripFunc(cl.Do)
}