98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
package ipc
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import (
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"reflect"
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"github.com/docker/libchan"
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)
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// Request defines a remote method call request
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// A return value struct is to be sent over the ResponseChannel
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type Request struct {
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Type string
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Parameters map[string]interface{}
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ResponseChannel libchan.Sender
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}
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// noWriteReadWriteCloser is a simple wrapper around an io.ReadCloser that implements the
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// io.ReadWriteCloser interface
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// Calls to Write are disallowed and will return an error
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type noWriteReadWriteCloser struct {
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io.ReadCloser
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}
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func (r noWriteReadWriteCloser) Write(p []byte) (n int, err error) {
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return 0, errors.New("Write unsupported")
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}
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// WrapReader wraps an io.Reader as an io.ReadWriteCloser with a nop Close and unsupported Write
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// Has no effect when an io.ReadWriteCloser is passed in
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func WrapReader(reader io.Reader) io.ReadWriteCloser {
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if readWriteCloser, ok := reader.(io.ReadWriteCloser); ok {
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return readWriteCloser
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} else if readCloser, ok := reader.(io.ReadCloser); ok {
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return noWriteReadWriteCloser{readCloser}
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} else {
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return noWriteReadWriteCloser{ioutil.NopCloser(reader)}
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}
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}
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type responseError struct {
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Type string
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Message string
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}
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// ResponseError wraps an error in a serializable struct containing the error's type and message
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func ResponseError(err error) *responseError {
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if err == nil {
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return nil
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}
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return &responseError{
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Type: reflect.TypeOf(err).String(),
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Message: err.Error(),
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}
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}
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func (err *responseError) Error() string {
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return fmt.Sprintf("%s: %s", err.Type, err.Message)
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}
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// IPC method call response object definitions
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// ReadStreamResponse is a response for a ReadStream request
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type ReadStreamResponse struct {
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Reader io.ReadWriteCloser
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Error *responseError
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}
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// WriteStreamResponse is a response for a WriteStream request
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type WriteStreamResponse struct {
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Error *responseError
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}
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// ResumeWritePositionResponse is a response for a ResumeWritePosition request
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type ResumeWritePositionResponse struct {
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Position uint64
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Error *responseError
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}
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// ListResponse is a response for a List request
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type ListResponse struct {
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Keys []string
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Error *responseError
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}
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// MoveResponse is a response for a Move request
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type MoveResponse struct {
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Error *responseError
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}
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// DeleteResponse is a response for a Delete request
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type DeleteResponse struct {
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Error *responseError
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}
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