start adding method handlers

cmd/serve/api.go

@@ -0,0 +1,196 @@
+package main
+
+import (
+	"encoding/json"
+	"io"
+	"io/fs"
+	"net/http"
+
+	"git.yetaga.in/alazyreader/library/media"
+	"tailscale.com/client/tailscale"
+)
+
+type Router struct {
+	static fs.FS
+	lib    Library
+	rcol   RecordCollection
+}
+
+type AdminRouter struct {
+	static fs.FS
+	lib    Library
+	ts     *tailscale.LocalClient
+}
+
+type handler struct {
+	get    func()
+	post   func()
+	put    func()
+	delete func()
+}
+
+func (h handler) Handle(w http.ResponseWriter, req *http.Request) {
+	if req.Method == http.MethodHead && h.get != nil {
+		h.get()
+	} else if req.Method == http.MethodGet && h.get != nil {
+		h.get()
+	} else if req.Method == http.MethodPost && h.post != nil {
+		h.post()
+	} else if req.Method == http.MethodPut && h.put != nil {
+		h.put()
+	} else if req.Method == http.MethodDelete && h.delete != nil {
+		h.delete()
+	} else {
+		badMethod(w)
+	}
+}
+
+func writeError[T any](t T, err error) func(w http.ResponseWriter) (T, bool) {
+	return func(w http.ResponseWriter) (T, bool) {
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+		}
+		return t, err == nil
+	}
+}
+
+func writeNoBody(w http.ResponseWriter, status int) {
+	w.WriteHeader(status)
+}
+func writeJSON(w http.ResponseWriter, b any, status int) {
+	bytes, err := json.Marshal(b)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(status)
+	w.Write(bytes)
+	w.Write([]byte("\n"))
+}
+
+func (router *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	switch r.URL.Path {
+	case "/api/records":
+		handler{
+			get: func() { getRecords(router.rcol, w, r) },
+		}.Handle(w, r)
+	case "/api/books":
+		handler{
+			get: func() { getBooks(router.lib, w, r) },
+		}.Handle(w, r)
+	default:
+		static(router.static).ServeHTTP(w, r)
+	}
+}
+
+func (router *AdminRouter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	switch r.URL.Path {
+	case "/api/whoami":
+		handler{
+			get: func() { getWhoAmI(router.ts, w, r) },
+		}.Handle(w, r)
+	case "/api/books":
+		handler{
+			get:    func() { getBooks(router.lib, w, r) },
+			post:   func() { addBook(router.lib, w, r) },
+			delete: func() { deleteBook(router.lib, w, r) },
+		}.Handle(w, r)
+	default:
+		static(router.static).ServeHTTP(w, r)
+	}
+}
+
+func badMethod(w http.ResponseWriter) {
+	writeJSON(w,
+		struct{ Error string }{Error: "method not supported"},
+		http.StatusMethodNotAllowed)
+}
+
+func getBooks(l Library, w http.ResponseWriter, r *http.Request) {
+	books, err := l.GetAllBooks(r.Context())
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	writeJSON(w, books, http.StatusOK)
+}
+
+func addBook(l Library, w http.ResponseWriter, r *http.Request) {
+	if r.Body == nil {
+		http.Error(w, "no body provided", http.StatusBadRequest)
+		return
+	}
+	defer r.Body.Close()
+	b, err := io.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, "error reading body", http.StatusBadRequest)
+		return
+	}
+	book := &media.Book{}
+	err = json.Unmarshal(b, book)
+	if err != nil {
+		http.Error(w, "error parsing body", http.StatusBadRequest)
+		return
+	}
+	err = l.AddBook(r.Context(), book)
+	if err != nil {
+		http.Error(w, "error parsing body", http.StatusBadRequest)
+		return
+	}
+	writeNoBody(w, http.StatusAccepted)
+}
+
+func deleteBook(l Library, w http.ResponseWriter, r *http.Request) {
+	if r.Body == nil {
+		http.Error(w, "no body provided", http.StatusBadRequest)
+		return
+	}
+	defer r.Body.Close()
+	b, err := io.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, "error reading body", http.StatusBadRequest)
+		return
+	}
+	book := &media.Book{}
+	err = json.Unmarshal(b, book)
+	if err != nil {
+		http.Error(w, "error parsing body", http.StatusBadRequest)
+		return
+	}
+	err = l.DeleteBook(r.Context(), book)
+	if err != nil {
+		http.Error(w, "error parsing body", http.StatusBadRequest)
+		return
+	}
+	writeNoBody(w, http.StatusAccepted)
+}
+
+func getRecords(l RecordCollection, w http.ResponseWriter, r *http.Request) {
+	records, err := l.GetAllRecords(r.Context())
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	writeJSON(w, records, http.StatusOK)
+}
+
+func getWhoAmI(ts *tailscale.LocalClient, w http.ResponseWriter, r *http.Request) {
+	whois, ok := writeError(ts.WhoIs(r.Context(), r.RemoteAddr))(w)
+	if !ok {
+		return
+	}
+	writeJSON(w, struct {
+		Username      string `json:"Username"`
+		DisplayName   string `json:"DisplayName"`
+		ProfilePicURL string `json:"ProfilePicURL"`
+	}{
+		Username:      whois.UserProfile.LoginName,
+		DisplayName:   whois.UserProfile.DisplayName,
+		ProfilePicURL: whois.UserProfile.ProfilePicURL,
+	}, http.StatusOK)
+}
+
+func static(f fs.FS) http.Handler {
+	return http.FileServer(http.FS(f))
+}

cmd/serve/main.go

@@ -2,11 +2,12 @@ package main
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
-	"io/fs"
 	"log"
+	"net"
 	"net/http"
+	"os"
+	"os/signal"
 	"strings"
 	"time"
 
@@ -16,8 +17,8 @@ import (
 	"git.yetaga.in/alazyreader/library/media"
 	"github.com/kelseyhightower/envconfig"
 	"golang.org/x/sync/errgroup"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/tsnet"
+	"tailscale.com/util/must"
 )
 
 func obscureStr(in string, l int) string {
@@ -26,100 +27,62 @@ func obscureStr(in string, l int) string {
 
 type Library interface {
 	GetAllBooks(context.Context) ([]media.Book, error)
+	AddBook(context.Context, *media.Book) error
+	DeleteBook(context.Context, *media.Book) error
 }
 
 type RecordCollection interface {
 	GetAllRecords(context.Context) ([]media.Record, error)
 }
 
-type Router struct {
-	static fs.FS
-	lib    Library
-	rcol   RecordCollection
-}
-
-type AdminRouter struct {
-	static fs.FS
-	lib    Library
-	ts     *tailscale.LocalClient
-}
-
-func writeJSON(w http.ResponseWriter, b []byte, status int) {
-	w.Header().Set("Content-Type", "application/json; charset=utf-8")
-	w.WriteHeader(status)
-	w.Write(b)
-	w.Write([]byte("\n"))
-}
-
-func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	if req.URL.Path == "/api/records" {
-		RecordsAPIHandler(r.rcol).ServeHTTP(w, req)
-		return
-	}
-	if req.URL.Path == "/api/books" {
-		BooksAPIHandler(r.lib).ServeHTTP(w, req)
-		return
-	}
-	StaticHandler(r.static).ServeHTTP(w, req)
-}
-
-func (r *AdminRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	whois, _ := r.ts.WhoIs(req.Context(), req.RemoteAddr)
-	w.Write([]byte(fmt.Sprintf("%+v", whois.UserProfile.DisplayName)))
-	// StaticHandler(r.static).ServeHTTP(w, req)
-}
-
-func BooksAPIHandler(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
-
-		}
-		writeJSON(w, b, http.StatusOK)
-	})
-}
-
-func RecordsAPIHandler(l RecordCollection) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		books, err := l.GetAllRecords(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
-		}
-		writeJSON(w, b, http.StatusOK)
-	})
-}
-
-func StaticHandler(f fs.FS) http.Handler {
-	return http.FileServer(http.FS(f))
-}
-
 func main() {
 	var c config.Config
-	err := envconfig.Process("library", &c)
-	if err != nil {
-		log.Fatalln(err)
-	}
-	f, err := frontend.Root()
-	if err != nil {
-		log.Fatalln(err)
-	}
+	must.Do(envconfig.Process("library", &c))
+
 	var lib Library
+	var err error
 	if c.DBType == "memory" {
 		lib = &database.Memory{}
 	} else if c.DBType == "sql" {
+		var latest, run int
+		lib, latest, run, err = setupSQL(c)
+		if err != nil {
+			log.Fatalf("err starting sql connection: %v", err)
+		}
+		log.Printf("latest migration: %d; migrations run: %d", latest, run)
+	}
+	discogsCache := must.Get(database.NewDiscogsCache(
+		c.DiscogsToken, time.Hour*24, c.DiscogsUser, c.DiscogsPersist, c.DiscogsCacheFile,
+	))
+
+	frontendRoot := must.Get(frontend.Root())
+	adminRoot := must.Get(frontend.AdminRoot())
+
+	servers := make(chan (*http.Server), 3)
+	errGroup := errgroup.Group{}
+	errGroup.Go(func() error {
+		return start(servers)(
+			publicServer(8080, &Router{
+				static: frontendRoot,
+				lib:    lib,
+				rcol:   discogsCache,
+			}))
+	})
+	errGroup.Go(func() error {
+		return start(servers)(
+			tailscaleListener("library-admin", &AdminRouter{
+				static: adminRoot,
+				lib:    lib,
+			}))
+	})
+	errGroup.Go(func() error {
+		return shutdown(servers)
+	})
+
+	log.Println(errGroup.Wait())
+}
+
+func setupSQL(c config.Config) (Library, int, int, error) {
 	if c.DBUser == "" || c.DBPass == "" || c.DBHost == "" || c.DBPort == "" || c.DBName == "" {
 		if c.DBPass != "" {
 			c.DBPass = obscureStr(c.DBPass, 3)
@@ -127,65 +90,72 @@ func main() {
 		if c.DiscogsToken != "" {
 			c.DiscogsToken = obscureStr(c.DiscogsToken, 3)
 		}
-			log.Fatalf("vars: %+v", c)
+		return nil, 0, 0, fmt.Errorf("invalid config; vars provided: %+v", c)
 	}
 	sql, err := database.NewMySQLConnection(c.DBUser, c.DBPass, c.DBHost, c.DBPort, c.DBName)
 	if err != nil {
-			log.Fatalln(err)
+		return nil, 0, 0, err
 	}
 	err = sql.PrepareDatabase(context.Background())
 	if err != nil {
-			log.Fatalln(err)
+		return nil, 0, 0, err
 	}
 	latest, run, err := sql.RunMigrations(context.Background())
 	if err != nil {
-			log.Fatalln(err)
+		return nil, 0, 0, err
 	}
-		log.Printf("latest migration: %d; migrations run: %d", latest, run)
-		lib = sql
-	}
-	discogsCache, err := database.NewDiscogsCache(c.DiscogsToken, time.Hour*24, c.DiscogsUser, c.DiscogsPersist, c.DiscogsCacheFile)
+	return sql, latest, run, nil
+}
+
+func start(servers chan (*http.Server)) func(*http.Server, net.Listener, error) error {
+	return func(s *http.Server, l net.Listener, err error) error {
 		if err != nil {
-		log.Fatalln(err)
+			return err
+		}
+		servers <- s
+		return s.Serve(l)
 	}
-	errGroup := errgroup.Group{}
-	errGroup.Go(func() error {
-		return publicListener(8080, &Router{
-			static: f,
-			lib:    lib,
-			rcol:   discogsCache,
-		})
-	})
-	errGroup.Go(func() error {
-		f, _ := frontend.AdminRoot()
-		return tailscaleListener("library-admin", &AdminRouter{
-			static: f,
-			lib:    lib,
-		})
-	})
-	log.Println(errGroup.Wait())
 }
 
-func publicListener(port int, handler http.Handler) error {
-	log.Printf("Listening on http://0.0.0.0:%d/", port)
-	return http.ListenAndServe(fmt.Sprintf(":%d", port), handler)
+func shutdown(servers chan (*http.Server)) error {
+	sigint := make(chan os.Signal, 1)
+	signal.Notify(sigint, os.Interrupt)
+	<-sigint
+	close(servers)
+	var err error
+	for server := range servers {
+		ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+		if shutdownerr := server.Shutdown(ctx); shutdownerr != nil {
+			err = shutdownerr
+		}
+		cancel()
+	}
+	return err
 }
 
-func tailscaleListener(hostname string, handler *AdminRouter) error {
+func publicServer(port int, handler http.Handler) (*http.Server, net.Listener, error) {
+	server := &http.Server{Handler: handler}
+	ln, err := net.Listen("tcp", fmt.Sprintf(":%d", 8080))
+	if err != nil {
+		return nil, nil, err
+	}
+	log.Println("starting public server")
+	return server, ln, nil
+}
+
+func tailscaleListener(hostname string, handler *AdminRouter) (*http.Server, net.Listener, error) {
 	s := &tsnet.Server{
 		Dir:      ".config/" + hostname,
 		Hostname: hostname,
 	}
-	defer s.Close()
-
 	ln, err := s.Listen("tcp", ":80")
 	if err != nil {
-		fmt.Printf("%+v\n", err)
-		return nil
+		return nil, nil, err
 	}
 	handler.ts, err = s.LocalClient()
 	if err != nil {
-		return err
+		return nil, nil, err
 	}
-	return (&http.Server{Handler: handler}).Serve(ln)
+	server := &http.Server{Handler: handler}
+	return server, ln, nil
 }

database/mysql.go

@@ -153,9 +153,8 @@ func (m *MySQL) GetAllBooks(ctx context.Context) ([]media.Book, error) {
 	}
 
 	allBooksQuery := fmt.Sprintf(`SELECT
-		id, title, authors, sortauthor, isbn10, isbn13, format,
-		genre, publisher, series, volume, year, signed,
-		description, notes, coverurl, childrens
+		id, title, authors, sortauthor, isbn10, isbn13, format, genre, publisher,
+		series, volume, year, signed, description, notes, coverurl, childrens
 	FROM %s`, m.tableName)
 
 	books := []media.Book{}
@@ -169,12 +168,8 @@ func (m *MySQL) GetAllBooks(ctx context.Context) ([]media.Book, error) {
 		b := media.Book{}
 		var authors string
 		err := rows.Scan(
-			&b.ID, &b.Title, &authors,
-			&b.SortAuthor, &b.ISBN10, &b.ISBN13,
-			&b.Format, &b.Genre, &b.Publisher,
-			&b.Series, &b.Volume, &b.Year,
-			&b.Signed, &b.Description, &b.Notes,
-			&b.CoverURL, &b.Childrens)
+			&b.ID, &b.Title, &authors, &b.SortAuthor, &b.ISBN10, &b.ISBN13, &b.Format, &b.Genre, &b.Publisher,
+			&b.Series, &b.Volume, &b.Year, &b.Signed, &b.Description, &b.Notes, &b.CoverURL, &b.Childrens)
 		if err != nil {
 			return nil, err
 		}
@@ -193,25 +188,14 @@ func (m *MySQL) AddBook(ctx context.Context, b *media.Book) error {
 
 	res, err := m.connection.ExecContext(ctx, `
 		INSERT INTO `+m.tableName+`
-		(title, authors, sortauthor, isbn10, isbn13, format, genre, publisher, series, volume, year, signed, description, notes, coverurl, childrens)
+		(
+			title, authors, sortauthor, isbn10, isbn13, format, genre, publisher, series,
+			volume, year, signed, description, notes, coverurl, childrens
+		)
 		VALUES
 		(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
-		b.Title,
-		strings.Join(b.Authors, ";"),
-		b.SortAuthor,
-		b.ISBN10,
-		b.ISBN13,
-		b.Format,
-		b.Genre,
-		b.Publisher,
-		b.Series,
-		b.Volume,
-		b.Year,
-		b.Signed,
-		b.Description,
-		b.Notes,
-		b.CoverURL,
-		b.Childrens,
+		b.Title, strings.Join(b.Authors, ";"), b.SortAuthor, b.ISBN10, b.ISBN13, b.Format, b.Genre, b.Publisher, b.Series,
+		b.Volume, b.Year, b.Signed, b.Description, b.Notes, b.CoverURL, b.Childrens,
 	)
 	if err != nil {
 		return err
@@ -236,41 +220,13 @@ func (m *MySQL) UpdateBook(ctx context.Context, old, new *media.Book) error {
 
 	res, err := m.connection.ExecContext(ctx, `
 		UPDATE `+m.tableName+`
-		SET id=?
-			title=?
-			authors=?
-			sortauthor=?
-			isbn10=?
-			isbn13=?
-			format=?
-			genre=?
-			publisher=?
-			series=?
-			volume=?
-			year=?
-			signed=?
-			description=?
-			notes=?
-			coverurl=?
-			childrens=?
+		SET
+			id=? title=? authors=? sortauthor=? isbn10=? isbn13=? format=? genre=? publisher=?
+			series=? volume=? year=? signed=? description=? notes=? coverurl=? childrens=?
 		WHERE id=?`,
-		new.Title,
-		strings.Join(new.Authors, ";"),
-		new.SortAuthor,
-		new.ISBN10,
-		new.ISBN13,
-		new.Format,
-		new.Genre,
-		new.Publisher,
-		new.Series,
-		new.Volume,
-		new.Year,
-		new.Signed,
-		new.Description,
-		new.Notes,
-		new.CoverURL,
-		new.Childrens,
-		old.ID)
+		new.Title, strings.Join(new.Authors, ";"), new.SortAuthor, new.ISBN10, new.ISBN13, new.Format, new.Genre, new.Publisher,
+		new.Series, new.Volume, new.Year, new.Signed, new.Description, new.Notes, new.CoverURL, new.Childrens, old.ID,
+	)
 	if err != nil {
 		return err
 	}
@@ -284,6 +240,10 @@ func (m *MySQL) UpdateBook(ctx context.Context, old, new *media.Book) error {
 	return nil
 }
 
+func (m *MySQL) DeleteBook(_ context.Context, b *media.Book) error {
+	return nil
+}
+
 func parseMigrationFileName(filename string) (int, string, error) {
 	sp := strings.SplitN(filename, "-", 2)
 	i, err := strconv.Atoi(sp[0])