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handlers.go
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/
handlers.go
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package v2
import (
"fmt"
"math/rand"
"github.com/arobie1992/go-clarinet/v2/connection"
"github.com/arobie1992/go-clarinet/v2/log"
"github.com/arobie1992/go-clarinet/v2/peer"
"github.com/arobie1992/go-clarinet/v2/transport"
)
type connectHandlerAdapter struct {
userHandler transport.ConnectHandler
node *Node
}
func (h *connectHandlerAdapter) Handle(peerID peer.ID, request connection.ConnectRequest) (connection.ConnectResponse, error) {
sender, err := h.node.peerStore.Find(request.Sender)
if err != nil {
return connection.ConnectResponse{
ConnectionID: request.ConnectionID,
Errors: []string{err.Error()},
Accepted: false,
RejectReasons: []string{},
}, nil
}
h.node.log.Trace("Found sender in peerstore: %s", sender)
receiver, err := h.node.peerStore.Find(request.Receiver)
if err != nil {
return connection.ConnectResponse{
ConnectionID: request.ConnectionID,
Errors: []string{err.Error()},
Accepted: false,
RejectReasons: []string{},
}, nil
}
h.node.log.Trace("Found receiver in peerstore: %s", receiver)
if sender.ID() != peerID && receiver.ID() != peerID {
return connection.ConnectResponse{
ConnectionID: request.ConnectionID,
Errors: []string{},
Accepted: false,
RejectReasons: []string{"Will not accept connection from node that is not either the sender or the receiver."},
}, nil
}
h.node.log.Trace("ConnectRequest is from a node that is either going to be the sender or the receiver, so is permitted.")
self, err := h.node.peerStore.Self()
if err != nil {
return connection.ConnectResponse{
ConnectionID: request.ConnectionID,
Errors: []string{err.Error()},
Accepted: false,
RejectReasons: []string{},
}, nil
}
h.node.log.Trace("Got self: %s", self)
if request.Sender != self.ID() && request.Receiver != self.ID() {
return connection.ConnectResponse{
ConnectionID: request.ConnectionID,
Errors: []string{},
Accepted: false,
RejectReasons: []string{"Connection is not to or from this node."},
}, nil
}
h.node.log.Trace("ConnectRequest is for a connection that would either be to or from this node, so is permitted.")
resp, err := h.userHandler.Handle(peerID, request)
if err != nil || len(resp.Errors) > 0 || !resp.Accepted {
h.node.log.Debug("Connection will not be added to peer store")
if h.node.log.Level().AtLeast(log.Trace()) {
h.node.log.Trace("err != nil: %t", err != nil)
h.node.log.Trace("len(resp.Errors): %d", len(resp.Errors))
h.node.log.Trace("!resp.Accepted: %t", !resp.Accepted)
}
return resp, err
}
h.node.log.Trace("Got response from handler: %v", resp)
h.node.log.Debug("Preparing to accept connection %s into peerstore", request.ConnectionID)
if err := h.node.connectionStore.Accept(request.ConnectionID, sender, receiver, connection.AwaitingWitness()); err != nil {
resp.Errors = append(resp.Errors, err.Error())
return resp, nil
}
if (request.Options.WitnessSelector == connection.WitnessSelectorReceiver() && self.ID() == request.Receiver) ||
(request.Options.WitnessSelector == connection.WitnessSelectorSender() && self.ID() == request.Sender) {
go func() {
err := h.node.connectionStore.Update(request.ConnectionID, func(conn connection.Connection) (connection.Connection, error) {
return h.node.handleWitnessSelection(conn, request.Options, h.Options())
})
if err != nil {
h.node.log.Error("Encountered error while attempting to select witness for connection %s: %s", request.ConnectionID, err)
}
}()
}
return resp, nil
}
func (h *connectHandlerAdapter) Options() transport.Options {
return h.userHandler.Options()
}
type witnessHandlerAdapter struct {
userHandler transport.WitnessHandler
node *Node
}
func (h *witnessHandlerAdapter) Handle(peerID peer.ID, request connection.WitnessRequest) (connection.WitnessResponse, error) {
sender, err := h.node.peerStore.Find(request.Sender)
if err != nil {
return connection.WitnessResponse{
ConnectionID: request.ConnectionID,
Errors: []string{err.Error()},
Accepted: false,
RejectReasons: []string{},
}, nil
}
receiver, err := h.node.peerStore.Find(request.Receiver)
if err != nil {
return connection.WitnessResponse{
ConnectionID: request.ConnectionID,
Errors: []string{err.Error()},
Accepted: false,
RejectReasons: []string{},
}, nil
}
if sender.ID() != peerID && receiver.ID() != peerID {
return connection.WitnessResponse{
ConnectionID: request.ConnectionID,
Errors: []string{},
Accepted: false,
RejectReasons: []string{"Will not accept connection from node that is not either the sender or the receiver."},
}, nil
}
self, err := h.node.Self()
if err != nil {
return connection.WitnessResponse{
ConnectionID: request.ConnectionID,
Errors: []string{err.Error()},
Accepted: false,
RejectReasons: []string{},
}, nil
}
if sender.ID() == self.ID() || receiver.ID() == self.ID() {
return connection.WitnessResponse{
ConnectionID: request.ConnectionID,
Errors: []string{},
Accepted: false,
RejectReasons: []string{"Cannot witness request in self is sender or receiver in."},
}, nil
}
resp, err := h.userHandler.Handle(peerID, request)
if err != nil || len(resp.Errors) > 0 || !resp.Accepted {
return resp, err
}
if err := h.node.connectionStore.Accept(request.ConnectionID, sender, receiver, connection.Open()); err != nil {
resp.Errors = append(resp.Errors, err.Error())
return resp, nil
}
err = h.node.connectionStore.Update(request.ConnectionID, func(conn connection.Connection) (connection.Connection, error) {
self, err := h.node.Self()
if err != nil {
return nil, err
}
return conn.SetWitness(self.ID())
})
if err != nil {
return connection.WitnessResponse{
ConnectionID: request.ConnectionID,
Errors: []string{err.Error()},
Accepted: false,
RejectReasons: []string{},
}, nil
}
return resp, nil
}
func (h *witnessHandlerAdapter) Options() transport.Options {
return h.userHandler.Options()
}
type witnessNotificationHandlerAdapter struct {
userHandler transport.WitnessNotificationHandler
node *Node
}
func (h *witnessNotificationHandlerAdapter) Handle(peerID peer.ID, notification connection.WitnessNotification) error {
return h.node.connectionStore.Update(notification.ConnectionID, func(conn connection.Connection) (connection.Connection, error) {
if conn.Status() != connection.AwaitingWitness() {
return nil, fmt.Errorf(
"Received witness notification from peer %s for connection %s that is not awaiting witness notification.",
peerID,
conn.ID(),
)
}
h.node.log.Trace("Connection %s is in %s so will update", conn.ID(), connection.AwaitingWitness())
self, err := h.node.peerStore.Self()
if err != nil {
return nil, err
}
h.node.log.Trace("Successfully got self")
expectedPeer := conn.Sender()
if expectedPeer == self.ID() {
expectedPeer = conn.Receiver()
}
h.node.log.Debug("Expecting witness notification from: %s", expectedPeer)
if peerID != expectedPeer {
return nil, fmt.Errorf(
"Received witness notification from unexpected peer for connection %s. Expected: %s, Got: %s",
conn.ID(),
expectedPeer,
peerID,
)
}
h.node.log.Trace("Witness notification came from expected peer")
if err := h.userHandler.Handle(peerID, notification); err != nil {
return nil, err
}
conn, err = conn.SetWitness(notification.Witness)
if err != nil {
return conn, err
}
return conn.SetStatus(connection.Open())
})
}
func (h *witnessNotificationHandlerAdapter) Options() transport.Options {
return h.userHandler.Options()
}
type closeHandlerAdapter struct {
userHandler transport.CloseHandler
node *Node
}
func (h *closeHandlerAdapter) Handle(peerID peer.ID, request connection.CloseRequest) error {
return h.node.connectionStore.Update(request.ConnectionID, func(conn connection.Connection) (connection.Connection, error) {
if conn.Status() == connection.Closed() {
return nil, nil
}
if err := h.userHandler.Handle(peerID, request); err != nil {
conn, err2 := conn.SetStatus(connection.Closing())
if err2 != nil {
h.node.log.Error("Encountered error while attempting to set connection %s status to %s: %s", conn.ID(), connection.Closing(), err)
return nil, err
}
return conn, err
}
return conn.SetStatus(connection.Closed())
})
}
func (h *closeHandlerAdapter) Options() transport.Options {
return h.userHandler.Options()
}
type peerRequestHandlerAdapter struct {
userHandler transport.PeerRequestHandler
node *Node
}
func (h *peerRequestHandlerAdapter) Handle(peerID peer.ID, request peer.PeersRequest) (*peer.PeersResponse, error) {
resp, err := h.userHandler.Handle(peerID, request)
if err != nil {
return nil, err
}
if resp != nil {
return resp, nil
}
peers, err := h.node.Peers()
if err != nil {
return nil, err
}
self, err := h.node.Self()
if err != nil {
return nil, err
}
resp = &peer.PeersResponse{}
for i := 0; i < request.Num && len(peers) > 0; i += 1 {
ind := rand.Intn(len(peers))
p := peers[ind]
peers = append(peers[:ind], peers[ind+1:]...)
if p.ID() == self.ID() {
ind := rand.Intn(len(peers))
p = peers[ind]
peers = append(peers[:ind], peers[ind+1:]...)
}
resp.Peers = append(resp.Peers, p)
}
return resp, nil
}
func (h *peerRequestHandlerAdapter) Options() transport.Options {
return h.userHandler.Options()
}