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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"log"
"net"
"net/http"
"os"
"os/signal"
"strings"
"sync"
"github.com/spuf/mockable-server/control"
"github.com/spuf/mockable-server/middleware"
"github.com/spuf/mockable-server/mock"
"github.com/spuf/mockable-server/storage"
)
var (
Application = "mockable-server"
Version string
mockAddr string
controlAddr string
)
func main() {
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s (%s):\n", Application, Version)
flag.PrintDefaults()
}
flag.StringVar(&mockAddr, "mock-addr", ":8010", "Mock server address")
flag.StringVar(&controlAddr, "control-addr", ":8020", "Control server address")
flag.VisitAll(func(f *flag.Flag) {
envName := strings.ReplaceAll(strings.ToUpper(f.Name), "-", "_")
if envVal, ok := os.LookupEnv(envName); ok {
if err := flag.Set(f.Name, envVal); err != nil {
panic(err)
}
}
f.Usage = fmt.Sprintf("%s [%s]", f.Usage, envName)
})
flag.Parse()
logFlags := log.LstdFlags | log.Lmsgprefix
if Version == "" {
logFlags = logFlags | log.Lshortfile
}
controlLogger := log.New(os.Stdout, "[control] ", logFlags)
mockLogger := log.New(os.Stdout, "[mock] ", logFlags)
queues := storage.NewQueues()
servers := [...]*http.Server{
{
Addr: controlAddr,
Handler: middleware.NewServerHandler(fmt.Sprintf("%s %s (control)", Application, Version),
middleware.NewLoggerHandler(controlLogger,
control.NewHandler(queues))),
ErrorLog: controlLogger,
},
{
Addr: mockAddr,
Handler: middleware.NewServerHandler(fmt.Sprintf("%s %s", Application, Version),
middleware.NewLoggerHandler(mockLogger,
mock.NewHandler(queues))),
ErrorLog: mockLogger,
},
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
serverErrors := make(chan error, len(servers))
quitSignal := make(chan os.Signal, 1)
signal.Notify(quitSignal, os.Interrupt)
go func() {
defer cancel()
<-quitSignal
}()
wg := new(sync.WaitGroup)
for _, srv := range servers {
wg.Add(1)
go func(srv *http.Server) {
defer wg.Done()
srv.RegisterOnShutdown(func() {
if srv.ErrorLog != nil {
srv.ErrorLog.Printf("Shutting down server")
}
})
onListen := func(addr net.Addr) {
if srv.ErrorLog != nil {
srv.ErrorLog.Printf("Server is listening on %s", addr.String())
}
}
if err := middleware.ListenAndServeWithGracefulShutdown(ctx, srv, onListen); err != nil {
defer cancel()
serverErrors <- err
if srv.ErrorLog != nil {
srv.ErrorLog.Printf("failed: %v", err)
}
}
}(srv)
}
wg.Wait()
select {
case err := <-serverErrors:
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
default:
close(serverErrors)
}
}