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packages.go
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packages.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package packages
import (
"context"
"fmt"
"time"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"go.thethings.network/lorawan-stack/v3/pkg/applicationserver/io"
"go.thethings.network/lorawan-stack/v3/pkg/log"
"go.thethings.network/lorawan-stack/v3/pkg/rpcserver"
"go.thethings.network/lorawan-stack/v3/pkg/ttnpb"
"go.thethings.network/lorawan-stack/v3/pkg/web"
"go.thethings.network/lorawan-stack/v3/pkg/workerpool"
"google.golang.org/grpc"
)
const namespace = "applicationserver/io/packages"
type server struct {
ttnpb.UnimplementedApplicationPackageRegistryServer
ctx context.Context
server io.Server
registry Registry
handlers map[string]ApplicationPackageHandler
pools map[string]workerpool.WorkerPool[*associatedApplicationUp]
}
// Server is an application packages frontend.
type Server interface {
rpcserver.ServiceRegisterer
web.Registerer
}
func createPackagePoolHandler(
name string, handler ApplicationPackageHandler, timeout time.Duration,
) workerpool.Handler[*associatedApplicationUp] {
h := func(ctx context.Context, associatedUp *associatedApplicationUp) {
pair, up := associatedUp.pair, associatedUp.up
ctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
if err := handler.HandleUp(ctx, pair.defaultAssociation, pair.association, up); err != nil {
log.FromContext(ctx).WithError(err).Warn("Failed to handle message")
registerMessageFailed(ctx, name, err)
return
}
registerMessageProcessed(ctx, name)
}
return h
}
// New returns an application packages server wrapping the given registries and handlers.
func New(ctx context.Context, as io.Server, registry Registry, handlers map[string]ApplicationPackageHandler, workers int, timeout time.Duration) (Server, error) {
ctx = log.NewContextWithField(ctx, "namespace", namespace)
s := &server{
ctx: ctx,
server: as,
registry: registry,
handlers: handlers,
pools: make(map[string]workerpool.WorkerPool[*associatedApplicationUp]),
}
for name, handler := range handlers {
s.pools[name] = workerpool.NewWorkerPool(workerpool.Config[*associatedApplicationUp]{
Component: as,
Context: ctx,
Name: fmt.Sprintf("application_packages_%v", name),
Handler: createPackagePoolHandler(name, handler, timeout),
MaxWorkers: workers,
})
}
sub, err := as.Subscribe(ctx, "applicationpackages", nil, false)
if err != nil {
return nil, err
}
wp := workerpool.NewWorkerPool(workerpool.Config[*ttnpb.ApplicationUp]{
Component: as,
Context: ctx,
Name: "application_packages_fanout",
Handler: workerpool.HandlerFromUplinkHandler(s.handleUp),
})
sub.Pipe(ctx, as, "application_packages", wp.Publish)
return s, nil
}
type associationsPair struct {
defaultAssociation *ttnpb.ApplicationPackageDefaultAssociation
association *ttnpb.ApplicationPackageAssociation
}
type associatedApplicationUp struct {
pair *associationsPair
up *ttnpb.ApplicationUp
}
type associationsMap map[string]*associationsPair
func (s *server) findAssociations(ctx context.Context, ids *ttnpb.EndDeviceIdentifiers) (associationsMap, error) {
paths := []string{
"data",
"ids",
"package_name",
}
associations, err := s.registry.ListAssociations(ctx, ids, paths)
if err != nil {
return nil, err
}
defaults, err := s.registry.ListDefaultAssociations(ctx, ids.ApplicationIds, paths)
if err != nil {
return nil, err
}
m := make(associationsMap)
for _, association := range associations {
m[association.PackageName] = &associationsPair{
association: association,
}
}
for _, defaultAssociation := range defaults {
if pair, ok := m[defaultAssociation.PackageName]; ok {
pair.defaultAssociation = defaultAssociation
} else {
m[defaultAssociation.PackageName] = &associationsPair{
defaultAssociation: defaultAssociation,
}
}
}
return m, nil
}
func (s *server) handleUp(ctx context.Context, msg *ttnpb.ApplicationUp) error {
ctx = log.NewContextWithField(ctx, "namespace", namespace)
associations, err := s.findAssociations(ctx, msg.EndDeviceIds)
if err != nil {
return err
}
for name, pair := range associations {
pool, ok := s.pools[name]
if !ok {
continue
}
ctx := log.NewContextWithField(ctx, "package", name)
if err := pool.Publish(ctx, &associatedApplicationUp{
pair: pair,
up: msg,
}); err != nil {
log.FromContext(ctx).WithError(err).Warn("Failed to handle message")
registerMessageFailed(ctx, name, err)
}
}
return nil
}
// RegisterServices implements the rpcserver.ServiceRegisterer interface.
func (s *server) RegisterServices(gs *grpc.Server) {
ttnpb.RegisterApplicationPackageRegistryServer(gs, s)
for _, subsystem := range s.handlers {
if subsystem, ok := subsystem.(rpcserver.ServiceRegisterer); ok {
subsystem.RegisterServices(gs)
}
}
}
// RegisterHandlers implements the rpcserver.ServiceRegisterer interface.
func (s *server) RegisterHandlers(rs *runtime.ServeMux, conn *grpc.ClientConn) {
ttnpb.RegisterApplicationPackageRegistryHandler(s.ctx, rs, conn)
for _, subsystem := range s.handlers {
if subsystem, ok := subsystem.(rpcserver.ServiceRegisterer); ok {
subsystem.RegisterHandlers(rs, conn)
}
}
}
// RegisterRoutes implements the web.Registerer interface.
func (s *server) RegisterRoutes(ws *web.Server) {
for _, subsystem := range s.handlers {
if subsystem, ok := subsystem.(web.Registerer); ok {
subsystem.RegisterRoutes(ws)
}
}
}