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workercmd.go
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workercmd.go
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//
// Copyright (c) SAS Institute Inc.
//
// 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 workercmd
import (
"context"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"sync"
"syscall"
"github.com/sassoftware/relic/cmdline/shared"
"github.com/sassoftware/relic/internal/activation"
"github.com/sassoftware/relic/internal/activation/activatecmd"
"github.com/sassoftware/relic/token/open"
"github.com/spf13/cobra"
)
func init() {
AddWorkerCommand(shared.RootCmd)
}
func AddWorkerCommand(parent *cobra.Command) {
wc := &cobra.Command{
Use: "worker",
Run: worker,
Hidden: true,
}
parent.AddCommand(wc)
}
func worker(cmd *cobra.Command, args []string) {
log.SetFlags(0)
if len(args) != 2 {
log.Fatalln("invalid argument")
}
shared.ArgConfig = args[0]
tokenName := args[1]
if err := runWorker(tokenName); err != nil {
log.Fatalf("error: worker for token \"%s\": %+v", tokenName, err)
}
}
func runWorker(tokenName string) error {
if err := shared.InitConfig(); err != nil {
return err
}
cookie, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return err
}
lis, err := activation.GetListener(0, "tcp", "")
if err != nil {
return err
}
tok, err := open.Token(shared.CurrentConfig, tokenName, nil)
if err != nil {
return err
}
handler := &handler{
token: tok,
cookie: cookie,
}
srv := &http.Server{Handler: handler}
wg := new(sync.WaitGroup)
handler.shutdown = func() {
// keep the main goroutine from exiting until all requests are served
wg.Add(1)
// notify parent that this process is doomed and to start another one
activatecmd.DaemonStopping()
// stop accepting requests and wait for ongoing ones to finish
srv.Shutdown(context.Background())
wg.Done()
}
go handler.watchSignals()
go handler.healthCheck()
activation.DaemonReady()
err = srv.Serve(lis)
if err == http.ErrServerClosed {
err = nil
}
wg.Wait() // wait for shutdown to finish
return err
}
func (h *handler) watchSignals() {
ch := make(chan os.Signal, 1)
signal.Notify(ch,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT,
)
<-ch
signal.Stop(ch)
h.shutdown()
}