/
main.go
86 lines (71 loc) · 1.81 KB
/
main.go
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// Package main represents main entry point for HRD application.
package main
import (
"fmt"
"log"
"net/http"
"net/http/httputil"
"os"
)
const (
// header1 holds ENV header delimiter, just to separate output data.
header1 = "===============[ ENV ]==============="
// header2 holds HTTP header delimiter, just to separate output data.
header2 = "===============[ HTTP REQUEST ]==============="
)
var (
// AppEnv holds application environment name.
AppEnv = ""
// AppPort holds port which use to run application.
AppPort = "8080"
)
func main() {
runApp()
}
// runApp starts application.
func runApp() {
env := os.Getenv("APP_ENV")
if env != "" {
AppEnv = env
}
port := os.Getenv("APP_PORT")
if port != "" {
AppPort = port
}
// Init the only one HTTP handler.
http.HandleFunc("/", dumpHandler)
addr := fmt.Sprintf(":%s", AppPort)
log.Printf("starting server on: %s\n", addr)
err := http.ListenAndServe(addr, nil)
if err != nil {
log.Printf("failed to ListenAndServe, error: %#v\n", err)
}
}
// dumpHandler represents main HTTP handler.
func dumpHandler(w http.ResponseWriter, r *http.Request) {
// Get ENV dump for current environment.
envDump := dumpEnv()
// Get HTTP dump for current request.
httpDump, err := httputil.DumpRequest(r, true)
if err != nil {
http.Error(w, fmt.Sprint(err), http.StatusInternalServerError)
return
}
dump := fmt.Sprintf("%s \n\n %s \n\n %s \n\n %s", header1, envDump, header2, httpDump)
// Log HTTP dump just for local environment.
if AppEnv == "local" {
log.Print(dump)
}
// Print HTTP dump to response.
if _, err := fmt.Fprint(w, dump); err != nil {
log.Printf("failed to print header, error: %#v\n", err)
}
}
// dumpEnv returns ENV dump.
func dumpEnv() string {
dump := ""
for _, e := range os.Environ() {
dump += e + "\n"
}
return dump
}