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server.go
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server.go
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// Copyright © 2017 The Things Network
// Use of this source code is governed by the MIT license that can be found in the LICENSE file.
package broker
import (
"time"
pb "github.com/TheThingsNetwork/api/broker"
"github.com/TheThingsNetwork/api/broker/brokerclient"
"github.com/TheThingsNetwork/ttn/api/ratelimit"
"github.com/TheThingsNetwork/ttn/utils/errors"
"golang.org/x/net/context" // See https://github.com/grpc/grpc-go/issues/711"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
)
type brokerRPC struct {
broker *broker
brokerclient.BrokerStreamServer
routerUpRate *ratelimit.Registry
handlerDownRate *ratelimit.Registry
}
func (b *brokerRPC) associateRouter(md metadata.MD) (chan *pb.UplinkMessage, <-chan *pb.DownlinkMessage, func(), error) {
ctx := metadata.NewIncomingContext(context.Background(), md)
router, err := b.broker.ValidateNetworkContext(ctx)
if err != nil {
return nil, nil, nil, err
}
down, err := b.broker.ActivateRouter(router.ID)
if err != nil {
return nil, nil, nil, err
}
up := make(chan *pb.UplinkMessage, 1)
cancel := func() {
b.broker.DeactivateRouter(router.ID)
}
go func() {
for message := range up {
if waitTime := b.routerUpRate.Wait(router.ID); waitTime != 0 {
b.broker.Ctx.WithField("RouterID", router.ID).WithField("Wait", waitTime).Warn("Router reached uplink rate limit")
time.Sleep(waitTime)
}
go b.broker.HandleUplink(message)
}
}()
return up, down, cancel, nil
}
func (b *brokerRPC) getHandlerSubscribe(md metadata.MD) (<-chan *pb.DeduplicatedUplinkMessage, func(), error) {
ctx := metadata.NewIncomingContext(context.Background(), md)
handler, err := b.broker.ValidateNetworkContext(ctx)
if err != nil {
return nil, nil, err
}
ch, err := b.broker.ActivateHandlerUplink(handler.ID)
if err != nil {
return nil, nil, err
}
cancel := func() {
b.broker.DeactivateHandlerUplink(handler.ID)
}
return ch, cancel, nil
}
func (b *brokerRPC) getHandlerPublish(md metadata.MD) (chan *pb.DownlinkMessage, error) {
ctx := metadata.NewIncomingContext(context.Background(), md)
handler, err := b.broker.ValidateNetworkContext(ctx)
if err != nil {
return nil, err
}
ch := make(chan *pb.DownlinkMessage, 1)
go func() {
for message := range ch {
go func(downlink *pb.DownlinkMessage) {
// Get latest Handler metadata
handler, err := b.broker.Component.Discover("handler", handler.ID)
if err != nil {
return
}
for _, announcedID := range handler.AppIDs() {
if announcedID == downlink.AppID {
if waitTime := b.handlerDownRate.Wait(handler.ID); waitTime != 0 {
b.broker.Ctx.WithField("HandlerID", handler.ID).WithField("Wait", waitTime).Warn("Handler reached downlink rate limit")
time.Sleep(waitTime)
}
b.broker.HandleDownlink(downlink)
return
}
}
}(message)
}
}()
return ch, nil
}
func (b *brokerRPC) Activate(ctx context.Context, req *pb.DeviceActivationRequest) (res *pb.DeviceActivationResponse, err error) {
_, err = b.broker.ValidateNetworkContext(ctx)
if err != nil {
return nil, err
}
if err := req.Validate(); err != nil {
return nil, errors.Wrap(err, "Invalid Activation Request")
}
res, err = b.broker.HandleActivation(req)
if err == errDuplicateActivation {
return nil, grpc.Errorf(codes.OutOfRange, err.Error())
}
if err != nil {
return nil, err
}
return
}
func (b *broker) RegisterRPC(s *grpc.Server) {
server := &brokerRPC{broker: b}
server.SetLogger(b.Ctx)
server.RouterAssociateChanFunc = server.associateRouter
server.HandlerPublishChanFunc = server.getHandlerPublish
server.HandlerSubscribeChanFunc = server.getHandlerSubscribe
// TODO: Monitor actual rates and configure sensible limits
server.routerUpRate = ratelimit.NewRegistry(1000, time.Second)
server.handlerDownRate = ratelimit.NewRegistry(125, time.Second) // one eight of uplink
pb.RegisterBrokerServer(s, server)
}