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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"net/http"
"os"
"os/signal"
"path/filepath"
"syscall"
"time"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
log "github.com/sirupsen/logrus"
"github.com/spf13/afero"
)
const ShutdownTimeout = "30s"
func main() {
var cfgPath string
flag.StringVar(&cfgPath, "config", "", "location of config file (default: .)")
flag.Parse()
logger := log.New()
var appFs = afero.NewOsFs()
var cfgFile string
if cfgPath == "" {
cfgFile = DefaultConfigurationFileName
} else {
cfgFile = filepath.Join(cfgPath, DefaultConfigurationFileName)
}
if err := run(appFs, cfgPath, cfgFile, logger); err != nil {
log.WithField("fn", "main").Error(err)
os.Exit(1)
}
}
func run(fs afero.Fs, path string, cfgFile string, log *log.Logger) error {
firstRun, err := isFirstRun(fs, cfgFile)
if err != nil {
return err
}
if firstRun {
err = configureFirstRun(fs, cfgFile)
if err != nil {
return err
}
}
configFile, err := loadConfig(fs, cfgFile)
if err != nil {
return err
}
//Config CORS
router := mux.NewRouter()
cors := handlers.CORS(
handlers.AllowedHeaders([]string{"content-type"}),
handlers.AllowedOrigins([]string{"*"}),
handlers.AllowCredentials(),
)
router.Use(cors)
//Set handlers
for _, response := range configFile.Responses {
closure := response
log.Info("[", closure.Method, "] ", closure.Path, " -> ", closure.Status, " with body -> ", closure.JsonBody)
router.HandleFunc(closure.Path, newHandleFunc(fs, path, closure)).Methods(closure.Method)
}
http.Handle("/", router)
server := http.Server{
Addr: configFile.Addr,
Handler: router,
}
// Make a channel to listen for errors coming from the listener. Use a
// buffered channel so the goroutine can exit if we don't collect this error.
serverErrors := make(chan error, 1)
go func() {
log.Printf("API listening on %s\n", server.Addr)
serverErrors <- server.ListenAndServe()
}()
// Make a channel to listen for an interrupt or terminate signal from the OS.
// Use a buffered channel because the signal package requires it.
shutdown := make(chan os.Signal, 1)
signal.Notify(shutdown, os.Interrupt, syscall.SIGTERM)
// Blocking main and waiting for shutdown.
select {
case err := <-serverErrors:
log.Fatal(err)
case sig := <-shutdown:
log.Printf("main: %v : Start shutdown\n", sig)
// Give outstanding requests a deadline for completion.
duration, err := time.ParseDuration(ShutdownTimeout)
if err != nil {
log.Fatal(err)
}
ctx, cancel := context.WithTimeout(context.Background(), duration)
defer cancel()
// Asking listener to shutdown and shed load.
if err := server.Shutdown(ctx); err != nil {
server.Close()
return fmt.Errorf("could not stop server gracefully: %w", err)
}
}
log.Fatal(server.ListenAndServe())
return nil
}