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main.go
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main.go
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package main
import (
"compress/gzip"
"context"
"database/sql"
"embed"
"fmt"
"log"
"net/http"
"os"
"strconv"
"strings"
_ "github.com/denisenkom/go-mssqldb"
"github.com/go-chi/chi"
"github.com/go-chi/chi/middleware"
"github.com/lukewilliamboswell/go-web-starter/src/user"
)
//go:embed public/*
var staticFiles embed.FS
type ContextKey string
// Constants
const DB_KEY ContextKey = "db"
// Version is changed at build time
var version string = ""
// These variables read from environment variables
var (
secret string
db *sql.DB
dbServer string
dbPort int
dbUser string
password string
database string
)
func main() {
var err error
// Check version variable has been set at build time
if version == "" {
log.Fatalf("Error version not set at build time\n")
}
// Get server details from environment variables
dbServer = os.Getenv("DB_SERVER")
portStr := os.Getenv("DB_PORT")
dbUser = os.Getenv("DB_USER")
password = os.Getenv("DB_PASSWORD")
database = os.Getenv("DB_NAME")
secret = os.Getenv("APP_SECRET")
// Check secret environment variable has been set
if secret == "" {
log.Fatalf("Error secret not set\n")
}
// Convert port string to integer
dbPort, err = strconv.Atoi(portStr)
if err != nil {
log.Fatalf("Error converting port string to integer: %s\n", err.Error())
}
// Build connection string
connString := fmt.Sprintf("server=%s;user id=%s;password=%s;port=%d;database=%s;",
dbServer, dbUser, password, dbPort, database)
// Create connection pool
db, err = sql.Open("sqlserver", connString)
if err != nil {
log.Fatalf("Error creating connection pool: %s\n", err.Error())
}
// Ping server to verify connection
ctx := context.Background()
err = db.PingContext(ctx)
if err != nil {
log.Fatal(err.Error())
}
log.Printf("Connected to DB %s:%d as %s\n", dbServer, dbPort, dbUser)
// Create repositories
userRepository := user.NewRepository(db)
// Create controllers
userController := user.NewController(userRepository)
// Create router
router := chi.NewRouter()
// Add middleware
router.Use(middleware.Logger)
// If this is a development build, add middleware to set the user header
if version == "dev" {
router.Use(devMiddlewareSetUserHeader)
}
// Add middleware to authenticate user, except for the following routes
exceptions := []string{
"/health",
"/registered.html",
"/styles.css",
"/favicon.ico",
}
router.Use(userController.UserAuthenticationMiddleware(version, exceptions))
// Add database handle to request context
router.Use(middleware.WithValue(DB_KEY, db))
// Register handlers
router.Get("/headers", handleGetHeaders) // TODO remove
router.Get("/health", handleGetHealth(checkDBHealth(db)))
// Create a API router
api := chi.NewRouter()
// Register API routes
userController.RegisterRoutes(api)
// Mount API router
router.Mount("/api", api)
// Serve static files
router.HandleFunc("/*", func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = "/public" + r.URL.Path
if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
w.Header().Set("Content-Encoding", "gzip")
gz := gzip.NewWriter(w)
defer gz.Close()
gzw := gzipResponseWriter{ResponseWriter: w, Writer: gz}
http.FileServer(http.FS(staticFiles)).ServeHTTP(gzw, r)
} else {
http.FileServer(http.FS(staticFiles)).ServeHTTP(w, r)
}
})
// Start server
log.Printf("Starting server on port 8080\n")
err = http.ListenAndServe(":8080", router)
if err != nil {
log.Fatalf("Fatal error starting server: %s\n", err.Error())
}
}
type gzipResponseWriter struct {
http.ResponseWriter
*gzip.Writer
}
func (w gzipResponseWriter) Header() http.Header {
return w.ResponseWriter.Header()
}
func (w gzipResponseWriter) Write(b []byte) (int, error) {
return w.Writer.Write(b)
}
func (w gzipResponseWriter) WriteHeader(statusCode int) {
w.ResponseWriter.WriteHeader(statusCode)
}
// Set the X-Ms-Client-Principal-Id for development builds
func devMiddlewareSetUserHeader(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.Header.Set("X-Ms-Client-Principal-Id", "bdd00b62-f7b6-40b4-b78f-d4b30f9dfe15")
next.ServeHTTP(w, r)
})
}