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response_writer.go
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response_writer.go
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package httpd
import (
"encoding/json"
"io"
"net/http"
)
// ResponseWriter is an interface for writing a response.
type ResponseWriter interface {
// WriteResponse writes a response.
WriteResponse(resp Response) (int, error)
http.ResponseWriter
}
// NewResponseWriter creates a new ResponseWriter based on the Accept header
// in the request that wraps the ResponseWriter.
func NewResponseWriter(w http.ResponseWriter, r *http.Request) ResponseWriter {
pretty := r.URL.Query().Get("pretty") == "true"
rw := &responseWriter{ResponseWriter: w}
switch r.Header.Get("Accept") {
case "application/json":
fallthrough
default:
w.Header().Add("Content-Type", "application/json")
rw.formatter = &jsonFormatter{Pretty: pretty, Writer: w}
}
return rw
}
// WriteError is a convenience function for writing an error response to the ResponseWriter.
func WriteError(w ResponseWriter, err error) (int, error) {
return w.WriteResponse(Response{Err: err})
}
// responseWriter is an implementation of ResponseWriter.
type responseWriter struct {
formatter interface {
WriteResponse(resp Response) (int, error)
}
http.ResponseWriter
}
// WriteResponse writes the response using the formatter.
func (w *responseWriter) WriteResponse(resp Response) (int, error) {
return w.formatter.WriteResponse(resp)
}
// Flush flushes the ResponseWriter if it has a Flush() method.
func (w *responseWriter) Flush() {
if w, ok := w.ResponseWriter.(http.Flusher); ok {
w.Flush()
}
}
// CloseNotify calls CloseNotify on the underlying http.ResponseWriter if it
// exists. Otherwise, it returns a nil channel that will never notify.
func (w *responseWriter) CloseNotify() <-chan bool {
if notifier, ok := w.ResponseWriter.(http.CloseNotifier); ok {
return notifier.CloseNotify()
}
return nil
}
type jsonFormatter struct {
io.Writer
Pretty bool
}
func (w *jsonFormatter) WriteResponse(resp Response) (n int, err error) {
var b []byte
if w.Pretty {
b, err = json.MarshalIndent(resp, "", " ")
} else {
b, err = json.Marshal(resp)
}
if err != nil {
n, err = io.WriteString(w, err.Error())
} else {
n, err = w.Write(b)
}
w.Write([]byte("\n"))
n++
return n, err
}