func (c *client) Send(req cmds.Request) (cmds.Response, error) {
if req.Context() == nil {
log.Warningf("no context set in request")
if err := req.SetRootContext(context.TODO()); err != nil {
return nil, err
}
}
// save user-provided encoding
previousUserProvidedEncoding, found, err := req.Option(cmds.EncShort).String()
if err != nil {
return nil, err
}
// override with json to send to server
req.SetOption(cmds.EncShort, cmds.JSON)
// stream channel output
req.SetOption(cmds.ChanOpt, "true")
query, err := getQuery(req)
if err != nil {
return nil, err
}
var fileReader *MultiFileReader
var reader io.Reader
if req.Files() != nil {
fileReader = NewMultiFileReader(req.Files(), true)
reader = fileReader
} else {
// if we have no file data, use an empty Reader
// (http.NewRequest panics when a nil Reader is used)
reader = strings.NewReader("")
}
path := strings.Join(req.Path(), "/")
url := fmt.Sprintf(ApiUrlFormat, c.serverAddress, ApiPath, path, query)
httpReq, err := http.NewRequest("POST", url, reader)
if err != nil {
return nil, err
}
// TODO extract string consts?
if fileReader != nil {
httpReq.Header.Set(contentTypeHeader, "multipart/form-data; boundary="+fileReader.Boundary())
httpReq.Header.Set(contentDispHeader, "form-data: name=\"files\"")
} else {
httpReq.Header.Set(contentTypeHeader, applicationOctetStream)
}
version := config.CurrentVersionNumber
httpReq.Header.Set(uaHeader, fmt.Sprintf("/go-ipfs/%s/", version))
ec := make(chan error, 1)
rc := make(chan cmds.Response, 1)
dc := req.Context().Done()
go func() {
httpRes, err := c.httpClient.Do(httpReq)
if err != nil {
ec <- err
return
}
// using the overridden JSON encoding in request
res, err := getResponse(httpRes, req)
if err != nil {
ec <- err
return
}
rc <- res
}()
for {
select {
case <-dc:
log.Debug("Context cancelled, cancelling HTTP request...")
tr := http.DefaultTransport.(*http.Transport)
tr.CancelRequest(httpReq)
dc = nil // Wait for ec or rc
case err := <-ec:
return nil, err
case res := <-rc:
if found && len(previousUserProvidedEncoding) > 0 {
// reset to user provided encoding after sending request
// NB: if user has provided an encoding but it is the empty string,
// still leave it as JSON.
req.SetOption(cmds.EncShort, previousUserProvidedEncoding)
}
return res, nil
}
}
}