// dash runs the given method and command on the dashboard.
// If args is non-nil it is encoded as the URL query string.
// If req is non-nil it is JSON-encoded and passed as the body of the HTTP POST.
// If resp is non-nil the server's response is decoded into the value pointed
// to by resp (resp must be a pointer).
func dash(meth, cmd string, args url.Values, req, resp interface{}) error {
var r *http.Response
var err error
if *verbose {
log.Println("dash", meth, cmd, args, req)
}
cmd = "http://" + *dashboard + "/" + cmd
if len(args) > 0 {
cmd += "?" + args.Encode()
}
switch meth {
case "GET":
if req != nil {
log.Panicf("%s to %s with req", meth, cmd)
}
r, err = http.Get(cmd)
case "POST":
var body io.Reader
if req != nil {
b, err := json.Marshal(req)
if err != nil {
return err
}
body = bytes.NewBuffer(b)
}
r, err = http.Post(cmd, "text/json", body)
default:
log.Panicf("%s: invalid method %q", cmd, meth)
panic("invalid method: " + meth)
}
if err != nil {
return err
}
defer r.Body.Close()
body := new(bytes.Buffer)
if _, err := body.ReadFrom(r.Body); err != nil {
return err
}
// Read JSON-encoded Response into provided resp
// and return an error if present.
var result = struct {
Response interface{}
Error string
}{
// Put the provided resp in here as it can be a pointer to
// some value we should unmarshal into.
Response: resp,
}
if err = json.Unmarshal(body.Bytes(), &result); err != nil {
log.Printf("json unmarshal %#q: %s\n", body.Bytes(), err)
return err
}
if result.Error != "" {
return errors.New(result.Error)
}
return nil
}
// dash is copied from the builder binary. It runs the given method and command on the dashboard.
//
// TODO(bradfitz,adg): unify this somewhere?
//
// If args is non-nil it is encoded as the URL query string.
// If req is non-nil it is JSON-encoded and passed as the body of the HTTP POST.
// If resp is non-nil the server's response is decoded into the value pointed
// to by resp (resp must be a pointer).
func dash(meth, cmd string, args url.Values, req, resp interface{}) error {
const builderVersion = 1 // keep in sync with dashboard/app/build/handler.go
argsCopy := url.Values{"version": {fmt.Sprint(builderVersion)}}
for k, v := range args {
if k == "version" {
panic(`dash: reserved args key: "version"`)
}
argsCopy[k] = v
}
var r *http.Response
var err error
cmd = dashBase() + cmd + "?" + argsCopy.Encode()
switch meth {
case "GET":
if req != nil {
log.Panicf("%s to %s with req", meth, cmd)
}
r, err = http.Get(cmd)
case "POST":
var body io.Reader
if req != nil {
b, err := json.Marshal(req)
if err != nil {
return err
}
body = bytes.NewBuffer(b)
}
r, err = http.Post(cmd, "text/json", body)
default:
log.Panicf("%s: invalid method %q", cmd, meth)
panic("invalid method: " + meth)
}
if err != nil {
return err
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
return fmt.Errorf("bad http response: %v", r.Status)
}
body := new(bytes.Buffer)
if _, err := body.ReadFrom(r.Body); err != nil {
return err
}
// Read JSON-encoded Response into provided resp
// and return an error if present.
var result = struct {
Response interface{}
Error string
}{
// Put the provided resp in here as it can be a pointer to
// some value we should unmarshal into.
Response: resp,
}
if err = json.Unmarshal(body.Bytes(), &result); err != nil {
log.Printf("json unmarshal %#q: %s\n", body.Bytes(), err)
return err
}
if result.Error != "" {
return errors.New(result.Error)
}
return nil
}