distribution/docs/client/errors.go

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package client
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"github.com/docker/distribution/registry/api/v2"
)
// UnexpectedHTTPStatusError is returned when an unexpected HTTP status is
// returned when making a registry api call.
type UnexpectedHTTPStatusError struct {
Status string
}
func (e *UnexpectedHTTPStatusError) Error() string {
return fmt.Sprintf("Received unexpected HTTP status: %s", e.Status)
}
// UnexpectedHTTPResponseError is returned when an expected HTTP status code
// is returned, but the content was unexpected and failed to be parsed.
type UnexpectedHTTPResponseError struct {
ParseErr error
Response []byte
}
func (e *UnexpectedHTTPResponseError) Error() string {
return fmt.Sprintf("Error parsing HTTP response: %s: %q", e.ParseErr.Error(), string(e.Response))
}
func parseHTTPErrorResponse(r io.Reader) error {
var errors v2.Errors
body, err := ioutil.ReadAll(r)
if err != nil {
return err
}
if err := json.Unmarshal(body, &errors); err != nil {
return &UnexpectedHTTPResponseError{
ParseErr: err,
Response: body,
}
}
return &errors
}
func handleErrorResponse(resp *http.Response) error {
if resp.StatusCode == 401 {
err := parseHTTPErrorResponse(resp.Body)
if uErr, ok := err.(*UnexpectedHTTPResponseError); ok {
return &v2.Error{
Code: v2.ErrorCodeUnauthorized,
Message: "401 Unauthorized",
Detail: uErr.Response,
}
}
return err
}
if resp.StatusCode >= 400 && resp.StatusCode < 500 {
return parseHTTPErrorResponse(resp.Body)
}
return &UnexpectedHTTPStatusError{Status: resp.Status}
}