/
main.go
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/
main.go
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// Copyright 2020 Anapaya Systems
//
// 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 main
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
_ "net/http/pprof"
"github.com/go-chi/chi/v5"
"github.com/go-chi/cors"
"golang.org/x/sync/errgroup"
"github.com/scionproto/scion/pkg/log"
"github.com/scionproto/scion/pkg/private/serrors"
"github.com/scionproto/scion/private/app"
"github.com/scionproto/scion/private/app/launcher"
"github.com/scionproto/scion/private/service"
"github.com/scionproto/scion/private/topology"
"github.com/scionproto/scion/router"
"github.com/scionproto/scion/router/config"
"github.com/scionproto/scion/router/control"
api "github.com/scionproto/scion/router/mgmtapi"
)
var globalCfg config.Config
func main() {
application := launcher.Application{
TOMLConfig: &globalCfg,
ShortName: "SCION Router",
Main: realMain,
}
application.Run()
}
func realMain(ctx context.Context) error {
controlConfig, err := loadControlConfig()
if err != nil {
return err
}
g, errCtx := errgroup.WithContext(ctx)
metrics := router.NewMetrics()
dp := &router.Connector{
DataPlane: router.DataPlane{
Metrics: metrics,
ExperimentalSCMPAuthentication: globalCfg.Features.ExperimentalSCMPAuthentication,
},
ReceiveBufferSize: globalCfg.Router.ReceiveBufferSize,
SendBufferSize: globalCfg.Router.SendBufferSize,
}
iaCtx := &control.IACtx{
Config: controlConfig,
DP: dp,
}
if err := iaCtx.Configure(); err != nil {
return serrors.WrapStr("configuring dataplane", err)
}
statusPages := service.StatusPages{
"info": service.NewInfoStatusPage(),
"config": service.NewConfigStatusPage(globalCfg),
"log/level": service.NewLogLevelStatusPage(),
"topology": topologyHandler(iaCtx.Config.Topo),
}
if err := statusPages.Register(http.DefaultServeMux, globalCfg.General.ID); err != nil {
return err
}
var cleanup app.Cleanup
g.Go(func() error {
defer log.HandlePanic()
<-errCtx.Done()
return cleanup.Do()
})
// Initialize and start service management API.
if globalCfg.API.Addr != "" {
r := chi.NewRouter()
r.Use(cors.Handler(cors.Options{
AllowedOrigins: []string{"*"},
}))
r.Get("/", api.ServeSpecInteractive)
r.Get("/openapi.json", api.ServeSpecJSON)
server := api.Server{
Config: service.NewConfigStatusPage(globalCfg).Handler,
Info: service.NewInfoStatusPage().Handler,
LogLevel: service.NewLogLevelStatusPage().Handler,
Dataplane: dp,
}
log.Info("Exposing API", "addr", globalCfg.API.Addr)
h := api.HandlerFromMuxWithBaseURL(&server, r, "/api/v1")
mgmtServer := &http.Server{
Addr: globalCfg.API.Addr,
Handler: h,
}
cleanup.Add(mgmtServer.Close)
g.Go(func() error {
defer log.HandlePanic()
err := mgmtServer.ListenAndServe()
if err != nil && !errors.Is(err, http.ErrServerClosed) {
return serrors.WrapStr("serving service management API", err)
}
return nil
})
}
g.Go(func() error {
defer log.HandlePanic()
return globalCfg.Metrics.ServePrometheus(errCtx)
})
g.Go(func() error {
defer log.HandlePanic()
runConfig := &router.RunConfig{
NumProcessors: globalCfg.Router.NumProcessors,
NumSlowPathProcessors: globalCfg.Router.NumSlowPathProcessors,
BatchSize: globalCfg.Router.BatchSize,
}
if err := dp.DataPlane.Run(errCtx, runConfig); err != nil {
return serrors.WrapStr("running dataplane", err)
}
return nil
})
return g.Wait()
}
func loadControlConfig() (*control.Config, error) {
newConf, err := control.LoadConfig(globalCfg.General.ID, globalCfg.General.ConfigDir)
if err != nil {
return nil, serrors.WrapStr("loading topology", err)
}
return newConf, nil
}
func topologyHandler(topo topology.Topology) service.StatusPage {
handler := func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
bytes, err := json.MarshalIndent(topo, "", " ")
if err != nil {
http.Error(w, "Unable to marshal topology", http.StatusInternalServerError)
return
}
fmt.Fprint(w, string(bytes)+"\n")
}
return service.StatusPage{
Info: "SCION topology",
Handler: handler,
}
}