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package client
import (
"context"
"errors"
"fmt"
"net/http"
cerrdefs "github.com/containerd/errdefs"
"github.com/containerd/errdefs/pkg/errhttp"
"github.com/docker/docker/api/types/versions"
)
// errConnectionFailed implements an error returned when connection failed.
type errConnectionFailed struct {
error
}
// Error returns a string representation of an errConnectionFailed
func (e errConnectionFailed) Error() string {
return e.error.Error()
}
func (e errConnectionFailed) Unwrap() error {
return e.error
}
// IsErrConnectionFailed returns true if the error is caused by connection failed.
func IsErrConnectionFailed(err error) bool {
return errors.As(err, &errConnectionFailed{})
}
// ErrorConnectionFailed returns an error with host in the error message when connection to docker daemon failed.
//
// Deprecated: this function was only used internally, and will be removed in the next release.
func ErrorConnectionFailed(host string) error {
return connectionFailed(host)
}
// connectionFailed returns an error with host in the error message when connection
// to docker daemon failed.
func connectionFailed(host string) error {
var err error
if host == "" {
err = errors.New("Cannot connect to the Docker daemon. Is the docker daemon running on this host?")
} else {
err = fmt.Errorf("Cannot connect to the Docker daemon at %s. Is the docker daemon running?", host)
}
return errConnectionFailed{error: err}
}
// IsErrNotFound returns true if the error is a NotFound error, which is returned
// by the API when some object is not found. It is an alias for [cerrdefs.IsNotFound].
//
// Deprecated: use [cerrdefs.IsNotFound] instead.
func IsErrNotFound(err error) bool {
return cerrdefs.IsNotFound(err)
}
type objectNotFoundError struct {
object string
id string
}
func (e objectNotFoundError) NotFound() {}
func (e objectNotFoundError) Error() string {
return fmt.Sprintf("Error: No such %s: %s", e.object, e.id)
}
// NewVersionError returns an error if the APIVersion required is less than the
// current supported version.
//
// It performs API-version negotiation if the Client is configured with this
// option, otherwise it assumes the latest API version is used.
func (cli *Client) NewVersionError(ctx context.Context, APIrequired, feature string) error {
// Make sure we negotiated (if the client is configured to do so),
// as code below contains API-version specific handling of options.
//
// Normally, version-negotiation (if enabled) would not happen until
// the API request is made.
if err := cli.checkVersion(ctx); err != nil {
return err
}
if cli.version != "" && versions.LessThan(cli.version, APIrequired) {
return fmt.Errorf("%q requires API version %s, but the Docker daemon API version is %s", feature, APIrequired, cli.version)
}
return nil
}
type httpError struct {
err error
errdef error
}
func (e *httpError) Error() string {
return e.err.Error()
}
func (e *httpError) Unwrap() error {
return e.err
}
func (e *httpError) Is(target error) bool {
return errors.Is(e.errdef, target)
}
// httpErrorFromStatusCode creates an errdef error, based on the provided HTTP status-code
func httpErrorFromStatusCode(err error, statusCode int) error {
if err == nil {
return nil
}
base := errhttp.ToNative(statusCode)
if base != nil {
return &httpError{err: err, errdef: base}
}
switch {
case statusCode >= http.StatusOK && statusCode < http.StatusBadRequest:
// it's a client error
return err
case statusCode >= http.StatusBadRequest && statusCode < http.StatusInternalServerError:
return &httpError{err: err, errdef: cerrdefs.ErrInvalidArgument}
case statusCode >= http.StatusInternalServerError && statusCode < 600:
return &httpError{err: err, errdef: cerrdefs.ErrInternal}
default:
return &httpError{err: err, errdef: cerrdefs.ErrUnknown}
}
}
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