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package main
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"os/signal"
"path/filepath"
"syscall"
"time"
"wikiapiserver/api"
"wikiapiserver/db"
)
// Config is loaded from config.json at startup.
type Config struct {
Database struct {
Host string `json:"host"`
Username string `json:"username"`
Password string `json:"password"`
Name string `json:"name"`
} `json:"database"`
Server struct {
Port int `json:"port"`
} `json:"server"`
}
func loadConfig() (*Config, error) {
// Try CWD first (works for go run), then executable dir (works for built binary)
for _, dir := range []string{".", ""} {
if dir == "" {
if exe, err := os.Executable(); err == nil {
dir = filepath.Dir(exe)
} else {
continue
}
}
path := filepath.Join(dir, "config.json")
f, err := os.Open(path)
if err != nil {
continue
}
var cfg Config
if err := json.NewDecoder(f).Decode(&cfg); err != nil {
f.Close()
return nil, fmt.Errorf("decode %s: %w", path, err)
}
f.Close()
return &cfg, nil
}
return nil, fmt.Errorf("config.json not found in . or next to executable")
}
func buildDSN(cfg *Config) string {
return fmt.Sprintf("%s:%s@tcp(%s)/%s?parseTime=true",
cfg.Database.Username,
cfg.Database.Password,
cfg.Database.Host,
cfg.Database.Name,
)
}
func main() {
cfg, err := loadConfig()
if err != nil {
log.Fatalf("config: %v", err)
}
database, err := db.Connect(buildDSN(cfg))
if err != nil {
log.Fatalf("db: %v", err)
}
defer database.Close()
handler := api.NewHandler(database)
mux := http.NewServeMux()
mux.HandleFunc("POST /register", handler.Register)
mux.HandleFunc("POST /login", handler.Login)
mux.HandleFunc("POST /refresh", handler.Refresh)
mux.HandleFunc("GET /health", handler.Health)
mux.HandleFunc("GET /token", handler.GetToken)
mux.HandleFunc("GET /article", handler.GetArticle)
addr := fmt.Sprintf(":%d", cfg.Server.Port)
srv := &http.Server{
Addr: addr,
Handler: mux,
ReadTimeout: 5 * time.Second,
WriteTimeout: 10 * time.Second,
IdleTimeout: 120 * time.Second,
}
// Graceful shutdown on SIGINT / SIGTERM
ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
defer stop()
go func() {
<-ctx.Done()
log.Println("shutting down...")
shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := srv.Shutdown(shutdownCtx); err != nil {
log.Printf("shutdown error: %v", err)
}
}()
log.Printf("listening on %s", addr)
if err := srv.ListenAndServe(); err != http.ErrServerClosed {
log.Fatalf("server: %v", err)
}
log.Println("stopped")
}
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