// Package backend includes types to send information to server backends.
// TODO(calavera): This package is pending of extraction to engine-api
// when the server package is clean of daemon dependencies.
package backend

import (
	"io"

	"github.com/docker/engine-api/types"
)

// ContainerAttachConfig holds the streams to use when connecting to a container to view logs.
type ContainerAttachConfig struct {
	GetStreams func() (io.ReadCloser, io.Writer, io.Writer, error)
	UseStdin   bool
	UseStdout  bool
	UseStderr  bool
	Logs       bool
	Stream     bool
	DetachKeys []byte

	// Used to signify that streams are multiplexed and therefore need a StdWriter to encode stdout/sderr messages accordingly.
	// TODO @cpuguy83: This shouldn't be needed. It was only added so that http and websocket endpoints can use the same function, and the websocket function was not using a stdwriter prior to this change...
	// HOWEVER, the websocket endpoint is using a single stream and SHOULD be encoded with stdout/stderr as is done for HTTP since it is still just a single stream.
	// Since such a change is an API change unrelated to the current changeset we'll keep it as is here and change separately.
	MuxStreams bool
}

// ContainerLogsConfig holds configs for logging operations. Exists
// for users of the backend to to pass it a logging configuration.
type ContainerLogsConfig struct {
	types.ContainerLogsOptions
	OutStream io.Writer
	Stop      <-chan bool
}

// ContainerStatsConfig holds information for configuring the runtime
// behavior of a backend.ContainerStats() call.
type ContainerStatsConfig struct {
	Stream    bool
	OutStream io.Writer
	Stop      <-chan bool
	Version   string
}