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component.go
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component.go
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// Copyright © 2021 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 component contains the methods and structures common to all components.
package component
import (
"context"
"fmt"
"net/http"
"os"
"os/signal"
"sort"
"strings"
"sync"
"syscall"
"github.com/heptiolabs/healthcheck"
"go.thethings.network/lorawan-stack/v3/pkg/auth/rights"
"go.thethings.network/lorawan-stack/v3/pkg/cluster"
"go.thethings.network/lorawan-stack/v3/pkg/config"
"go.thethings.network/lorawan-stack/v3/pkg/crypto"
"go.thethings.network/lorawan-stack/v3/pkg/fillcontext"
"go.thethings.network/lorawan-stack/v3/pkg/frequencyplans"
"go.thethings.network/lorawan-stack/v3/pkg/interop"
"go.thethings.network/lorawan-stack/v3/pkg/log"
"go.thethings.network/lorawan-stack/v3/pkg/ratelimit"
"go.thethings.network/lorawan-stack/v3/pkg/rpcserver"
"go.thethings.network/lorawan-stack/v3/pkg/ttnpb"
"go.thethings.network/lorawan-stack/v3/pkg/web"
"golang.org/x/crypto/acme/autocert"
"google.golang.org/grpc"
)
// Config is the type of configuration for Components
type Config struct {
config.ServiceBase `name:",squash" yaml:",inline"`
}
// Component is a base component for The Things Network cluster
type Component struct {
ctx context.Context
cancelCtx context.CancelFunc
terminationSignals chan os.Signal
config *Config
getBaseConfig func(ctx context.Context) config.ServiceBase
acme *autocert.Manager
logger log.Stack
cluster cluster.Cluster
clusterNew func(ctx context.Context, config *cluster.Config, options ...cluster.Option) (cluster.Cluster, error)
grpc *rpcserver.Server
grpcLogger log.Interface
grpcSubsystems []rpcserver.Registerer
web *web.Server
webSubsystems []web.Registerer
interop *interop.Server
interopSubsystems []interop.Registerer
healthHandler healthcheck.Handler
loopback *grpc.ClientConn
tcpListeners map[string]*listener
tcpListenersMu sync.Mutex
fillers []fillcontext.Filler
FrequencyPlans *frequencyplans.Store
KeyVault crypto.KeyVault
rightsFetcher rights.Fetcher
taskStarter TaskStarter
taskConfigs []*TaskConfig
limiter ratelimit.Interface
}
// Option allows extending the component when it is instantiated with New.
type Option func(*Component)
// WithClusterNew returns an option that overrides the component's function for
// setting up the cluster.
// This allows extending the cluster configuration with custom logic based on
// information in the context.
func WithClusterNew(f func(ctx context.Context, config *cluster.Config, options ...cluster.Option) (cluster.Cluster, error)) Option {
return func(c *Component) {
c.clusterNew = f
}
}
// WithGRPCLogger returns an option that overrides the component's gRPC logger.
func WithGRPCLogger(l log.Interface) Option {
return func(c *Component) {
c.grpcLogger = l
}
}
// WithTaskStarter returns an option that overrides the component's TaskStarter for
// starting tasks.
func WithTaskStarter(s TaskStarter) Option {
return func(c *Component) {
c.taskStarter = s
}
}
// WithBaseConfigGetter returns an option that overrides the component's function
// for getting the base config.
// This allows overriding the configuration with information in the context.
func WithBaseConfigGetter(f func(ctx context.Context) config.ServiceBase) Option {
return func(c *Component) {
c.getBaseConfig = f
}
}
// New returns a new component.
func New(logger log.Stack, config *Config, opts ...Option) (c *Component, err error) {
ctx, cancel := context.WithCancel(context.Background())
defer func() {
if err != nil {
cancel()
}
}()
ctx = log.NewContext(ctx, logger)
keyVault, err := config.KeyVault.KeyVault()
if err != nil {
return nil, err
}
c = &Component{
ctx: ctx,
cancelCtx: cancel,
terminationSignals: make(chan os.Signal),
config: config,
logger: logger,
healthHandler: healthcheck.NewHandler(),
tcpListeners: make(map[string]*listener),
KeyVault: keyVault,
taskStarter: StartTaskFunc(DefaultStartTask),
}
c.limiter, err = config.RateLimiting.New(ctx)
if err != nil {
return nil, err
}
for _, opt := range opts {
opt(c)
}
fpsFetcher, err := config.FrequencyPlansFetcher(ctx)
if err != nil {
return nil, err
}
c.FrequencyPlans = frequencyplans.NewStore(fpsFetcher)
if c.clusterNew == nil {
c.clusterNew = cluster.New
}
if err = c.initWeb(); err != nil {
return nil, err
}
if err := c.initACME(); err != nil {
return nil, err
}
config.Interop.SenderClientCA.BlobConfig = config.Blob
c.interop, err = interop.NewServer(c, c.FillContext, config.Interop)
if err != nil {
return nil, err
}
c.initRights()
c.initGRPC()
return c, nil
}
// MustNew calls New and returns a new component or panics on an error.
// In most cases, you should just use New.
func MustNew(logger log.Stack, config *Config, opts ...Option) *Component {
c, err := New(logger, config, opts...)
if err != nil {
panic(err)
}
return c
}
// Logger returns the logger of the component.
func (c *Component) Logger() log.Stack {
return c.logger
}
// LogDebug returns whether the component should log debug messages.
func (c *Component) LogDebug() bool {
return c.config.Log.Level == log.DebugLevel
}
// Context returns the context of the component.
func (c *Component) Context() context.Context {
return c.ctx
}
// GetBaseConfig gets the base config of the component.
func (c *Component) GetBaseConfig(ctx context.Context) config.ServiceBase {
if c.getBaseConfig != nil {
return c.getBaseConfig(ctx)
}
return c.config.ServiceBase
}
// FillContext fills the context.
// This method should only be used for request contexts.
func (c *Component) FillContext(ctx context.Context) context.Context {
for _, filler := range c.fillers {
ctx = filler(ctx)
}
return ctx
}
// AddContextFiller adds the specified filler.
func (c *Component) AddContextFiller(f fillcontext.Filler) {
c.fillers = append(c.fillers, f)
}
// FromRequestContext returns a derived context from the component context with key values from the request context.
// This can be used to decouple the lifetime from the request context while keeping security information.
func (c *Component) FromRequestContext(ctx context.Context) context.Context {
return &crossContext{
valueCtx: ctx,
cancelCtx: c.ctx,
}
}
// Start starts the component.
func (c *Component) Start() (err error) {
if c.grpc != nil {
c.logger.Debug("Initializing gRPC server...")
if err = c.setupGRPC(); err != nil {
return err
}
serviceInfo := c.grpc.Server.GetServiceInfo()
services := make([]string, 0, len(serviceInfo))
for service := range serviceInfo {
services = append(services, service)
}
sort.Strings(services)
c.logger.WithFields(log.Fields(
"namespace", "grpc",
"services", services,
)).Debug("Exposed services")
}
c.logger.Debug("Initializing cluster...")
if err := c.initCluster(); err != nil {
return err
}
c.logger.Debug("Initializing web server...")
for _, sub := range c.webSubsystems {
sub.RegisterRoutes(c.web)
}
c.web.RootRouter().PathPrefix("/").Handler(c.web.Router())
c.logger.Debug("Initializing interop server...")
for _, sub := range c.interopSubsystems {
sub.RegisterInterop(c.interop)
}
if c.grpc != nil {
c.logger.Debug("Starting gRPC server...")
if err = c.listenGRPC(); err != nil {
c.logger.WithError(err).Error("Could not start gRPC server")
return err
}
c.web.Prefix(ttnpb.HTTPAPIPrefix + "/").Handler(http.StripPrefix(ttnpb.HTTPAPIPrefix, c.grpc))
c.logger.Debug("Started gRPC server")
}
c.logger.Debug("Starting web server...")
if err = c.listenWeb(); err != nil {
c.logger.WithError(err).Error("Could not start web server")
return err
}
c.logger.Debug("Started web server")
c.logger.Debug("Starting interop server")
if err = c.listenInterop(); err != nil {
c.logger.WithError(err).Error("Could not start interop server")
return err
}
c.logger.Debug("Started interop server")
c.logger.Debug("Joining cluster...")
if err := c.cluster.Join(); err != nil {
c.logger.WithError(err).Error("Could not join cluster")
return err
}
c.logger.Debug("Joined cluster")
c.logger.Debug("Starting tasks")
c.startTasks()
c.logger.Debug("Started tasks")
return nil
}
// Run starts the component, and returns when a stop signal has been received by the process.
func (c *Component) Run() error {
defer c.Close()
if err := c.Start(); err != nil {
return err
}
defer func() {
c.logger.Debug("Leaving cluster...")
if err := c.cluster.Leave(); err != nil {
c.logger.WithError(err).Error("Could not leave cluster")
}
c.logger.Debug("Left cluster")
}()
signal.Notify(c.terminationSignals, os.Interrupt, os.Kill, syscall.SIGTERM)
for {
select {
case sig := <-c.terminationSignals:
fmt.Println()
c.logger.WithField("signal", sig).Info("Received signal, exiting...")
return nil
}
}
}
// Close closes the server.
func (c *Component) Close() {
c.cancelCtx()
c.tcpListenersMu.Lock()
defer c.tcpListenersMu.Unlock()
for _, l := range c.tcpListeners {
err := l.Close()
if err != nil && c.ctx.Err() == nil {
c.logger.WithError(err).Errorf("Error while stopping to listen on %s", l.Addr())
continue
}
c.logger.Debugf("Stopped listening on %s", l.Addr())
}
if c.grpc != nil {
c.logger.Debug("Stopping gRPC server...")
c.grpc.Stop()
c.logger.Debug("Stopped gRPC server")
}
}
// AllowInsecureForCredentials returns `true` if the component was configured to allow transmission of credentials
// over insecure transports.
func (c *Component) AllowInsecureForCredentials() bool {
return c.config.GRPC.AllowInsecureForCredentials
}
// ServeHTTP serves an HTTP request.
// If the Content-Type is application/grpc, the request is routed to gRPC.
// Otherwise, the request is routed to the default web server.
func (c *Component) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.ProtoMajor == 2 && strings.Contains(r.Header.Get("Content-Type"), "application/grpc") {
c.grpc.Server.ServeHTTP(w, r)
} else {
c.web.ServeHTTP(w, r)
}
}