get database migrations up and running

cmd/serve/main.go

@@ -1,15 +1,80 @@
 package main
 
 import (
-	"fmt"
+	"context"
+	"encoding/json"
 	"io/fs"
+	"log"
 	"net/http"
 
+	"git.yetaga.in/alazyreader/library/book"
+	"git.yetaga.in/alazyreader/library/database"
 	"git.yetaga.in/alazyreader/library/frontend"
 )
 
-// test 3
-func main() {
-	subfs, _ := fs.Sub(frontend.Static, "files")
-	fmt.Println(http.ListenAndServe(":8080", http.FileServer(http.FS(subfs))))
+type Library interface {
+	GetAllBooks(context.Context) ([]book.Book, error)
+}
+
+type Router struct {
+	static fs.FS
+	lib    Library
+}
+
+func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	if req.URL.Path == "/api" {
+		APIHandler(r.lib).ServeHTTP(w, req)
+		return
+	}
+	StaticHandler(r.static).ServeHTTP(w, req)
+	return
+}
+
+func APIHandler(l Library) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		books, err := l.GetAllBooks(r.Context())
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		b, err := json.Marshal(books)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		w.Write(b)
+		w.Write([]byte("\n"))
+	})
+}
+
+func StaticHandler(f fs.FS) http.Handler {
+	return http.FileServer(http.FS(f))
+}
+
+func main() {
+	f, err := frontend.Root()
+	if err != nil {
+		log.Fatalln(err)
+	}
+	lib, err := database.NewMySQLConnection("root", "KigYBNCT9IU5XyB3ehzMLFWyI", "127.0.0.1", "3306", "library")
+	if err != nil {
+		log.Fatalln(err)
+	}
+	err = lib.PrepareDatabase(context.Background())
+	if err != nil {
+		log.Fatalln(err)
+	}
+	latest, run, err := lib.RunMigrations(context.Background())
+	if err != nil {
+		log.Fatalln(err)
+	}
+	log.Printf("latest migration: %d; migrations run: %d", latest, run)
+	r := &Router{
+		static: f,
+		lib:    lib,
+	}
+	log.Println("Listening on http://localhost:8080/")
+	log.Fatalln(http.ListenAndServe(":8080", r))
 }