forked from vmware-archive/atc
/
hijack_streamer.go
111 lines (88 loc) · 2.72 KB
/
hijack_streamer.go
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package transport
// WorkerHijackStreamer implements Stream that is using our httpClient,
import (
"bufio"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"code.cloudfoundry.org/garden"
"github.com/concourse/atc/db"
"github.com/concourse/retryhttp"
"github.com/tedsuo/rata"
)
//go:generate counterfeiter . TransportDB
type TransportDB interface {
GetWorker(name string) (db.Worker, bool, error)
}
//go:generate counterfeiter . ReadCloser
type ReadCloser interface {
Read(p []byte) (n int, err error)
Close() error
}
//go:generate counterfeiter . RequestGenerator
type RequestGenerator interface {
CreateRequest(name string, params rata.Params, body io.Reader) (*http.Request, error)
}
// instead of httpClient defined in default Garden HijackStreamer
type WorkerHijackStreamer struct {
HttpClient *http.Client
HijackableClient retryhttp.HijackableClient
Req RequestGenerator
}
func (h *WorkerHijackStreamer) Stream(handler string, body io.Reader, params rata.Params, query url.Values, contentType string) (io.ReadCloser, error) {
request, err := h.Req.CreateRequest(handler, params, body)
if err != nil {
return nil, err
}
if contentType != "" {
request.Header.Set("Content-Type", contentType)
}
if query != nil {
request.URL.RawQuery = query.Encode()
}
httpResp, err := h.HttpClient.Do(request)
if err != nil {
return nil, err
}
if httpResp.StatusCode < 200 || httpResp.StatusCode > 299 {
defer httpResp.Body.Close()
var result garden.Error
err := json.NewDecoder(httpResp.Body).Decode(&result)
if err != nil {
return nil, fmt.Errorf("bad response: %s", err)
}
return nil, result.Err
}
return httpResp.Body, nil
}
func (h *WorkerHijackStreamer) Hijack(handler string, body io.Reader, params rata.Params, query url.Values, contentType string) (net.Conn, *bufio.Reader, error) {
request, err := h.Req.CreateRequest(handler, params, body)
if err != nil {
return nil, nil, err
}
if contentType != "" {
request.Header.Set("Content-Type", contentType)
}
if query != nil {
request.URL.RawQuery = query.Encode()
}
httpResp, hijackCloser, err := h.HijackableClient.Do(request)
if err != nil {
return nil, nil, err
}
if httpResp.StatusCode < 200 || httpResp.StatusCode > 299 {
defer hijackCloser.Close()
defer httpResp.Body.Close()
errRespBytes, err := ioutil.ReadAll(httpResp.Body)
if err != nil {
return nil, nil, fmt.Errorf("Backend error: Exit status: %d, error reading response body: %s", httpResp.StatusCode, err)
}
return nil, nil, fmt.Errorf("Backend error: Exit status: %d, message: %s", httpResp.StatusCode, errRespBytes)
}
hijackedConn, hijackedResponseReader := hijackCloser.Hijack()
return hijackedConn, hijackedResponseReader, nil
}