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http-lambda.go
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http-lambda.go
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package main
import (
"context"
"github.com/alecthomas/kingpin"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"github.com/nextmetaphor/http-lambda/controller"
"github.com/nextmetaphor/http-lambda/log"
"net/http"
"os"
"os/signal"
"syscall"
"time"
)
const (
logInsecureServerStarting = "http-lambda server starting on address [%s] and port [%s] with a insecure configuration"
logSecureServerStarting = "http-lambda server starting on address [%s] and port [%s] with a secure configuration: cert[%s] key[%s]"
logSignalReceived = "Signal [%s] received, shutting down server"
cfgDefaultListenAddress = ""
cfgDefaultListenPort = "18080"
cfgDefaultLogLevel = log.LevelWarn
cfgDefaultCertificateFile = "http-lambda.crt"
cfgDefaultKeyFile = "http-lambda.key"
)
func main() {
app := kingpin.New("http-lambda", "Simple golang-based utility which enables AWS Lambda functions to be invoked from an HTTP endpoint")
appHost := app.Flag("hostname", "hostname to bind to").Short('h').Default(cfgDefaultListenAddress).String()
appPort := app.Flag("port", "port to bind to").Short('p').Default(cfgDefaultListenPort).String()
appCertFile := app.Flag("certFile", "TLS certificate file").Short('c').Default(cfgDefaultCertificateFile).String()
appKeyFile := app.Flag("keyFile", "TLS key file").Short('k').Default(cfgDefaultKeyFile).String()
appSecure := app.Flag("secure", "whether to use secure TLS connection").Short('s').Default("false").Bool()
appLogLevel := app.Flag("logLevel", "log level: debug, info, warn or error").Short('l').Default(cfgDefaultLogLevel).String()
kingpin.MustParse(app.Parse(os.Args[1:]))
ctx := controller.Context{Log: log.Get(*appLogLevel), Router: mux.NewRouter()}
ctx.RegisterHealthHandlers()
ctx.RegisterLambdaHandlers()
server := &http.Server{
Addr: *appHost + ":" + *appPort,
Handler: handlers.LoggingHandler(os.Stdout, ctx.Router),
}
// See https://en.wikipedia.org/wiki/Signal_(IPC)
signalChannel := make(chan os.Signal, 1)
signal.Notify(signalChannel, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
go func() {
s := <-signalChannel
ctx.Log.Infof(logSignalReceived, s)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
server.Shutdown(ctx)
}()
if *appSecure {
ctx.Log.Infof(logSecureServerStarting, *appHost, *appPort, *appCertFile, *appKeyFile)
ctx.Log.Info(server.ListenAndServeTLS(*appCertFile, *appKeyFile))
} else {
ctx.Log.Infof(logInsecureServerStarting, *appHost, *appPort)
ctx.Log.Info(server.ListenAndServe())
}
}