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netutils.go
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netutils.go
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package utils
import (
"bufio"
"fmt"
"io"
"net"
"net/http"
"net/url"
"reflect"
)
// ProxyWriter calls recorder, used to debug logs.
type ProxyWriter struct {
w http.ResponseWriter
code int
length int64
log Logger
}
// NewProxyWriter creates a new ProxyWriter.
func NewProxyWriter(w http.ResponseWriter) *ProxyWriter {
return NewProxyWriterWithLogger(w, &NoopLogger{})
}
// NewProxyWriterWithLogger creates a new ProxyWriter.
func NewProxyWriterWithLogger(w http.ResponseWriter, l Logger) *ProxyWriter {
return &ProxyWriter{
w: w,
log: l,
}
}
// StatusCode gets status code.
func (p *ProxyWriter) StatusCode() int {
if p.code == 0 {
// per contract standard lib will set this to http.StatusOK if not set
// by user, here we avoid the confusion by mirroring this logic
return http.StatusOK
}
return p.code
}
// GetLength gets content length.
func (p *ProxyWriter) GetLength() int64 {
return p.length
}
// Header gets response header.
func (p *ProxyWriter) Header() http.Header {
return p.w.Header()
}
func (p *ProxyWriter) Write(buf []byte) (int, error) {
p.length += int64(len(buf))
return p.w.Write(buf)
}
// WriteHeader writes status code.
func (p *ProxyWriter) WriteHeader(code int) {
p.code = code
p.w.WriteHeader(code)
}
// Flush flush the writer.
func (p *ProxyWriter) Flush() {
if f, ok := p.w.(http.Flusher); ok {
f.Flush()
}
}
// CloseNotify returns a channel that receives at most a single value (true)
// when the client connection has gone away.
func (p *ProxyWriter) CloseNotify() <-chan bool {
if cn, ok := p.w.(http.CloseNotifier); ok {
return cn.CloseNotify()
}
p.log.Debug("Upstream ResponseWriter of type %v does not implement http.CloseNotifier. Returning dummy channel.", reflect.TypeOf(p.w))
return make(<-chan bool)
}
// Hijack lets the caller take over the connection.
func (p *ProxyWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
if hi, ok := p.w.(http.Hijacker); ok {
return hi.Hijack()
}
p.log.Debug("Upstream ResponseWriter of type %v does not implement http.Hijacker. Returning dummy channel.", reflect.TypeOf(p.w))
return nil, nil, fmt.Errorf("the response writer that was wrapped in this proxy, does not implement http.Hijacker. It is of type: %v", reflect.TypeOf(p.w))
}
// NewBufferWriter creates a new BufferWriter.
func NewBufferWriter(w io.WriteCloser, l Logger) *BufferWriter {
return &BufferWriter{
W: w,
H: make(http.Header),
log: l,
}
}
// BufferWriter buffer writer.
type BufferWriter struct {
H http.Header
Code int
W io.WriteCloser
log Logger
}
// Close close the writer.
func (b *BufferWriter) Close() error {
return b.W.Close()
}
// Header gets response header.
func (b *BufferWriter) Header() http.Header {
return b.H
}
func (b *BufferWriter) Write(buf []byte) (int, error) {
return b.W.Write(buf)
}
// WriteHeader writes status code.
func (b *BufferWriter) WriteHeader(code int) {
b.Code = code
}
// CloseNotify returns a channel that receives at most a single value (true)
// when the client connection has gone away.
func (b *BufferWriter) CloseNotify() <-chan bool {
if cn, ok := b.W.(http.CloseNotifier); ok {
return cn.CloseNotify()
}
b.log.Warn("Upstream ResponseWriter of type %v does not implement http.CloseNotifier. Returning dummy channel.", reflect.TypeOf(b.W))
return make(<-chan bool)
}
// Hijack lets the caller take over the connection.
func (b *BufferWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
if hi, ok := b.W.(http.Hijacker); ok {
return hi.Hijack()
}
b.log.Debug("Upstream ResponseWriter of type %v does not implement http.Hijacker. Returning dummy channel.", reflect.TypeOf(b.W))
return nil, nil, fmt.Errorf("the response writer that was wrapped in this proxy, does not implement http.Hijacker. It is of type: %v", reflect.TypeOf(b.W))
}
type nopWriteCloser struct {
io.Writer
}
func (*nopWriteCloser) Close() error { return nil }
// NopWriteCloser returns a WriteCloser with a no-op Close method wrapping
// the provided Writer w.
func NopWriteCloser(w io.Writer) io.WriteCloser {
return &nopWriteCloser{Writer: w}
}
// CopyURL provides update safe copy by avoiding shallow copying User field.
func CopyURL(i *url.URL) *url.URL {
out := *i
if i.User != nil {
u := *i.User
out.User = &u
}
return &out
}
// CopyHeaders copies http headers from source to destination, it
// does not override, but adds multiple headers.
func CopyHeaders(dst http.Header, src http.Header) {
for k, vv := range src {
dst[k] = append(dst[k], vv...)
}
}
// HasHeaders determines whether any of the header names is present in the http headers.
func HasHeaders(names []string, headers http.Header) bool {
for _, h := range names {
if headers.Get(h) != "" {
return true
}
}
return false
}
// RemoveHeaders removes the header with the given names from the headers map.
func RemoveHeaders(headers http.Header, names ...string) {
for _, h := range names {
headers.Del(h)
}
}