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package p2p
import (
"github.com/tendermint/tendermint/libs/service"
"github.com/tendermint/tendermint/p2p/conn"
)
// Reactor is responsible for handling incoming messages on one or more
// Channel. Switch calls GetChannels when reactor is added to it. When a new
// peer joins our node, InitPeer and AddPeer are called. RemovePeer is called
// when the peer is stopped. Receive is called when a message is received on a
// channel associated with this reactor.
//
// Peer#Send or Peer#TrySend should be used to send the message to a peer.
type Reactor interface {
service.Service // Start, Stop
// SetSwitch allows setting a switch.
SetSwitch(*Switch)
// GetChannels returns the list of MConnection.ChannelDescriptor. Make sure
// that each ID is unique across all the reactors added to the switch.
GetChannels() []*conn.ChannelDescriptor
// InitPeer is called by the switch before the peer is started. Use it to
// initialize data for the peer (e.g. peer state).
//
// NOTE: The switch won't call AddPeer nor RemovePeer if it fails to start
// the peer. Do not store any data associated with the peer in the reactor
// itself unless you don't want to have a state, which is never cleaned up.
InitPeer(peer Peer) Peer
// AddPeer is called by the switch after the peer is added and successfully
// started. Use it to start goroutines communicating with the peer.
AddPeer(peer Peer)
// RemovePeer is called by the switch when the peer is stopped (due to error
// or other reason).
RemovePeer(peer Peer, reason interface{})
// Receive is called by the switch when msgBytes is received from the peer.
//
// NOTE reactor can not keep msgBytes around after Receive completes without
// copying.
//
// CONTRACT: msgBytes are not nil.
//
// XXX: do not call any methods that can block or incur heavy processing.
// https://github.com/tendermint/tendermint/issues/2888
Receive(chID byte, peer Peer, msgBytes []byte)
}
//--------------------------------------
type BaseReactor struct {
service.BaseService // Provides Start, Stop, .Quit
Switch *Switch
}
func NewBaseReactor(name string, impl Reactor) *BaseReactor {
return &BaseReactor{
BaseService: *service.NewBaseService(nil, name, impl),
Switch: nil,
}
}
func (br *BaseReactor) SetSwitch(sw *Switch) {
br.Switch = sw
}
func (*BaseReactor) GetChannels() []*conn.ChannelDescriptor { return nil }
func (*BaseReactor) AddPeer(peer Peer) {}
func (*BaseReactor) RemovePeer(peer Peer, reason interface{}) {}
func (*BaseReactor) Receive(chID byte, peer Peer, msgBytes []byte) {}
func (*BaseReactor) InitPeer(peer Peer) Peer { return peer }