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stream.go
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stream.go
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package main
import (
"github.com/lyobzik/go-utils"
"github.com/lyobzik/leska/storage"
"github.com/op/go-logging"
"github.com/pkg/errors"
"net/http"
)
type Streamer struct {
logger *logging.Logger
storer *storage.Storer
handler http.Handler
}
func NewStreamer(logger *logging.Logger, storer *storage.Storer, handler http.Handler) *Streamer {
return &Streamer{
logger: logger,
storer: storer,
handler: handler,
}
}
func (s *Streamer) ServeHTTP(inResponse http.ResponseWriter, inRequest *http.Request) {
// TODO: возможно inRequest можно скопировать после неудачной попытке отправки.
request, response, err := s.copyRequestResponse(inRequest)
if err != nil {
s.responseError(inResponse, err)
return
}
repeateRequest := false
defer func() {
utils.CloseOnFail(repeateRequest, request)
response.Close()
}()
s.handler.ServeHTTP(response, &request.httpRequest)
if response.IsFailed() {
s.writeResponse(inResponse, http.StatusAccepted)
s.storer.Add(request)
repeateRequest = true
return
}
if err := response.Copy(inResponse); err != nil {
s.responseError(inResponse, err)
return
}
}
func (s *Streamer) copyRequestResponse(inRequest *http.Request) (*Request, *Response, error) {
request, err := NewRequest(inRequest, 1024*1024, 1024*1024)
if err != nil {
return nil, nil, errors.Wrapf(err, "cannot copy request")
}
success := false
defer func() {
utils.CloseOnFail(success, request)
}()
response, err := NewResponse()
if err != nil {
return nil, nil, errors.Wrapf(err, "cannot create response")
}
success = true
return request, response, nil
}
func (s *Streamer) writeResponse(response http.ResponseWriter, statusCode int) {
response.WriteHeader(statusCode)
response.Write([]byte(http.StatusText(statusCode)))
}
func (s *Streamer) responseError(response http.ResponseWriter, err error) {
// TODO: подумать нужно ли логировать содержимое запроса (тело может быть большим), поэтому если
// TODO: и логировать, то только какие-то заголовки.
s.logger.Errorf("cannot handle request: %v")
s.writeResponse(response, http.StatusInternalServerError)
}