storj/pkg/kademlia/endpoint.go

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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package kademlia
import (
"context"
"sync/atomic"
"github.com/zeebo/errs"
"go.uber.org/zap"
"storj.io/storj/pkg/pb"
)
// EndpointError defines errors class for Endpoint
var EndpointError = errs.Class("kademlia endpoint error")
// Endpoint implements the kademlia Endpoints
type Endpoint struct {
log *zap.Logger
service *Kademlia
routingTable *RoutingTable
connected int32
}
// NewEndpoint returns a new kademlia endpoint
func NewEndpoint(log *zap.Logger, service *Kademlia, routingTable *RoutingTable) *Endpoint {
return &Endpoint{
service: service,
routingTable: routingTable,
log: log,
}
}
// Query is a node to node communication query
func (endpoint *Endpoint) Query(ctx context.Context, req *pb.QueryRequest) (*pb.QueryResponse, error) {
if req.GetPingback() {
endpoint.pingback(ctx, req.Sender)
}
nodes, err := endpoint.routingTable.FindNear(req.Target.Id, int(req.Limit))
if err != nil {
return &pb.QueryResponse{}, EndpointError.New("could not find near endpoint: %v", err)
}
return &pb.QueryResponse{Sender: req.Sender, Response: nodes}, nil
}
// pingback implements pingback for queries
func (endpoint *Endpoint) pingback(ctx context.Context, target *pb.Node) {
_, err := endpoint.service.Ping(ctx, *target)
if err != nil {
endpoint.log.Debug("connection to node failed", zap.Error(err), zap.String("nodeID", target.Id.String()))
err = endpoint.routingTable.ConnectionFailed(target)
if err != nil {
endpoint.log.Error("could not respond to connection failed", zap.Error(err))
}
} else {
err = endpoint.routingTable.ConnectionSuccess(target)
if err != nil {
endpoint.log.Error("could not respond to connection success", zap.Error(err))
} else {
count := atomic.AddInt32(&endpoint.connected, 1)
if count == 1 {
endpoint.log.Sugar().Debugf("Successfully connected with %s", target.Address.Address)
} else if count%100 == 0 {
endpoint.log.Sugar().Debugf("Successfully connected with %s %dx times", target.Address.Address, count)
}
}
}
}
// Ping provides an easy way to verify a node is online and accepting requests
func (endpoint *Endpoint) Ping(ctx context.Context, req *pb.PingRequest) (*pb.PingResponse, error) {
//TODO
return &pb.PingResponse{}, nil
}