wip: 🔕 temporary commit

.dockerignore

@@ -5,5 +5,4 @@
 !/cmd
 !/internal
 !/templates
-!/error-pages.yml
 !/go.*

Dockerfile

@@ -48,22 +48,19 @@ WORKDIR /tmp/rootfs
 
 # prepare rootfs for runtime
 RUN --mount=type=bind,source=.,target=/src set -x \
-    && mkdir -p ./etc ./bin ./opt/html \
+    && mkdir -p ./etc ./bin \
     && echo 'appuser:x:10001:10001::/nonexistent:/sbin/nologin' > ./etc/passwd \
-    && echo 'appuser:x:10001:' > ./etc/group \
-    && cp -rv /src/templates ./opt/templates \
-    && rm -v ./opt/templates/*.md \
-    && cp -rv /src/error-pages.yml ./opt/error-pages.yml
+    && echo 'appuser:x:10001:' > ./etc/group
 
 # take the binary from the compile stage
 COPY --from=compile /tmp/error-pages ./bin/error-pages
 
 WORKDIR /tmp/rootfs/opt
 
-# generate static error pages (for usage inside another docker images, for example)
-RUN set -x \
-    && ./../bin/error-pages --verbose build --config-file ./error-pages.yml --index ./html \
-    && ls -l ./html
+## generate static error pages (for usage inside another docker images, for example)
+#RUN set -x \
+#    && ./../bin/error-pages --verbose build --config-file ./error-pages.yml --index ./html \
+#    && ls -l ./html
 
 # -✂- and this is the final stage (an empty filesystem is used) -------------------------------------------------------
 FROM scratch AS runtime
@@ -98,9 +95,9 @@ WORKDIR /opt
 
 # docs: https://docs.docker.com/reference/dockerfile/#healthcheck
 HEALTHCHECK --interval=10s --start-interval=1s --start-period=5s --timeout=2s CMD [\
-  "/bin/error-pages", "--log-json", "healthcheck" \
+  "/bin/error-pages", "--log-format", "json", "healthcheck" \
 ]
 
 ENTRYPOINT ["/bin/error-pages"]
 
-CMD ["--log-json", "serve"]
+CMD ["--log-format", "json", "serve"]

docker-compose.yml

@@ -10,7 +10,7 @@ services:
   web:
     build: {target: runtime}
     ports: ['8080:8080/tcp'] # open http://127.0.0.1:8080
-    command: serve --show-details --proxy-headers=X-Foo,Bar,Baz_blah --catch-all
+    command: --log-level debug serve --show-details --proxy-headers=X-Foo,Bar,Baz_blah
     develop: # available since docker compose v2.22, https://docs.docker.com/compose/file-watch/
       watch: [{action: rebuild, path: .}]
     security_opt: [no-new-privileges:true]

internal/cli/app.go

@@ -9,7 +9,6 @@ import (
 	_ "github.com/urfave/cli-docs/v3" // required for `go generate` to work
 	"github.com/urfave/cli/v3"
 
-	"gh.tarampamp.am/error-pages/internal-old/env"
 	"gh.tarampamp.am/error-pages/internal/appmeta"
 	"gh.tarampamp.am/error-pages/internal/cli/healthcheck"
 	"gh.tarampamp.am/error-pages/internal/cli/serve"
@@ -25,7 +24,7 @@ func NewApp(appName string) *cli.Command { //nolint:funlen
 			Name:     "log-level",
 			Value:    logger.InfoLevel.String(),
 			Usage:    "logging level (" + strings.Join(logger.LevelStrings(), "/") + ")",
-			Sources:  cli.EnvVars(env.LogLevel.String()),
+			Sources:  cli.EnvVars("LOG_LEVEL"),
 			OnlyOnce: true,
 			Config:   cli.StringConfig{TrimSpace: true},
 			Validator: func(s string) error {
@@ -41,7 +40,7 @@ func NewApp(appName string) *cli.Command { //nolint:funlen
 			Name:     "log-format",
 			Value:    logger.ConsoleFormat.String(),
 			Usage:    "logging format (" + strings.Join(logger.FormatStrings(), "/") + ")",
-			Sources:  cli.EnvVars(env.LogFormat.String()),
+			Sources:  cli.EnvVars("LOG_FORMAT"),
 			OnlyOnce: true,
 			Config:   cli.StringConfig{TrimSpace: true},
 			Validator: func(s string) error {

internal/http/handlers/live/handler.go

@@ -4,13 +4,22 @@ import (
 	"net/http"
 )
 
-// New creates a new handler that always returns "OK" with status code 200.
+// New creates a new handler that returns "OK" for GET and HEAD requests.
 func New() http.Handler {
-	var body = []byte("OK")
+	var body = []byte("OK\n")
 
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.Method {
+		case http.MethodGet:
 			w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 			w.WriteHeader(http.StatusOK)
 			_, _ = w.Write(body)
+
+		case http.MethodHead:
+			w.WriteHeader(http.StatusOK)
+
+		default:
+			http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
+		}
 	})
 }

internal/http/handlers/live/handler_test.go

@@ -13,14 +13,51 @@ import (
 func TestServeHTTP(t *testing.T) {
 	t.Parallel()
 
+	var handler = live.New()
+
+	t.Run("get", func(t *testing.T) {
 		var (
 			req = httptest.NewRequest(http.MethodGet, "http://testing", http.NoBody)
 			rr  = httptest.NewRecorder()
 		)
 
-	live.New().ServeHTTP(rr, req)
+		handler.ServeHTTP(rr, req)
 
 		assert.Equal(t, rr.Header().Get("Content-Type"), "text/plain; charset=utf-8")
 		assert.Equal(t, rr.Code, http.StatusOK)
-	assert.Equal(t, rr.Body.String(), "OK")
+		assert.Equal(t, "OK\n", rr.Body.String())
+	})
+
+	t.Run("head", func(t *testing.T) {
+		var (
+			req = httptest.NewRequest(http.MethodHead, "http://testing", http.NoBody)
+			rr  = httptest.NewRecorder()
+		)
+
+		handler.ServeHTTP(rr, req)
+
+		assert.Equal(t, rr.Code, http.StatusOK)
+		assert.Empty(t, rr.Header().Get("Content-Type"))
+		assert.Empty(t, rr.Body.Bytes())
+	})
+
+	t.Run("method not allowed", func(t *testing.T) {
+		for _, method := range []string{
+			http.MethodDelete,
+			http.MethodPatch,
+			http.MethodPost,
+			http.MethodPut,
+		} {
+			var (
+				req = httptest.NewRequest(method, "http://testing", http.NoBody)
+				rr  = httptest.NewRecorder()
+			)
+
+			handler.ServeHTTP(rr, req)
+
+			assert.Equal(t, rr.Header().Get("Content-Type"), "text/plain; charset=utf-8")
+			assert.Equal(t, rr.Code, http.StatusMethodNotAllowed)
+			assert.Equal(t, "Method Not Allowed\n", rr.Body.String())
+		}
+	})
 }

internal/http/handlers/version/handler.go

@@ -15,8 +15,17 @@ func New(ver string) http.Handler {
 	})
 
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.Method {
+		case http.MethodGet:
 			w.Header().Set("Content-Type", "application/json; charset=utf-8")
 			w.WriteHeader(http.StatusOK)
 			_, _ = w.Write(body)
+
+		case http.MethodHead:
+			w.WriteHeader(http.StatusOK)
+
+		default:
+			http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
+		}
 	})
 }

internal/http/handlers/version/handler_test.go

@@ -13,13 +13,51 @@ import (
 func TestServeHTTP(t *testing.T) {
 	t.Parallel()
 
+	var handler = version.New("\t\n foo@bar ")
+
+	t.Run("get", func(t *testing.T) {
 		var (
 			req = httptest.NewRequest(http.MethodGet, "http://testing", http.NoBody)
 			rr  = httptest.NewRecorder()
 		)
 
-	version.New("\t\n foo@bar ").ServeHTTP(rr, req)
+		handler.ServeHTTP(rr, req)
 
+		assert.Equal(t, rr.Header().Get("Content-Type"), "application/json; charset=utf-8")
 		assert.Equal(t, rr.Code, http.StatusOK)
 		assert.Equal(t, rr.Body.String(), `{"version":"foo@bar"}`)
+	})
+
+	t.Run("head", func(t *testing.T) {
+		var (
+			req = httptest.NewRequest(http.MethodHead, "http://testing", http.NoBody)
+			rr  = httptest.NewRecorder()
+		)
+
+		handler.ServeHTTP(rr, req)
+
+		assert.Equal(t, rr.Code, http.StatusOK)
+		assert.Empty(t, rr.Header().Get("Content-Type"))
+		assert.Empty(t, rr.Body.Bytes())
+	})
+
+	t.Run("method not allowed", func(t *testing.T) {
+		for _, method := range []string{
+			http.MethodDelete,
+			http.MethodPatch,
+			http.MethodPost,
+			http.MethodPut,
+		} {
+			var (
+				req = httptest.NewRequest(method, "http://testing", http.NoBody)
+				rr  = httptest.NewRecorder()
+			)
+
+			handler.ServeHTTP(rr, req)
+
+			assert.Equal(t, rr.Header().Get("Content-Type"), "text/plain; charset=utf-8")
+			assert.Equal(t, rr.Code, http.StatusMethodNotAllowed)
+			assert.Equal(t, "Method Not Allowed\n", rr.Body.String())
+		}
+	})
 }

internal/http/server.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"net"
 	"net/http"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -22,7 +23,6 @@ import (
 type Server struct {
 	log    *zap.Logger
 	server *http.Server
-	mux    *http.ServeMux
 }
 
 // NewServer creates a new HTTP server.
@@ -33,45 +33,65 @@ func NewServer(baseCtx context.Context, log *zap.Logger) Server {
 		maxHeaderBytes = (1 << 20) * 5                //nolint:mnd // 5 MB
 	)
 
-	var (
-		mux = http.NewServeMux()
-		srv = &http.Server{
-			Handler:           mux,
+	return Server{
+		log: log,
+		server: &http.Server{
 			ReadTimeout:       readTimeout,
 			WriteTimeout:      writeTimeout,
 			ReadHeaderTimeout: readTimeout,
 			MaxHeaderBytes:    maxHeaderBytes,
 			ErrorLog:          zap.NewStdLog(log),
 			BaseContext:       func(net.Listener) context.Context { return baseCtx },
+		},
 	}
-	)
-
-	return Server{log: log, server: srv, mux: mux}
 }
 
 // Register server handlers, middlewares, etc.
 func (s *Server) Register(cfg *config.Config) error {
-	// register middleware
+	var (
+		liveHandler       = live.New()
+		versionHandler    = version.New(appmeta.Version())
+		errorPagesHandler = error_page.New()
+
+		errorPageRegex = regexp.MustCompile(`^/(\d{3})(?:\.html|\.htm)?$`) // TODO: rewrite to function
+	)
+
+	s.server.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var url, method = r.URL.Path, r.Method
+
+		switch {
+		// live endpoints
+		case url == "/health/live" || url == "/health" || url == "/healthz" || url == "/live":
+			liveHandler.ServeHTTP(w, r)
+		// version endpoint
+		case url == "/version":
+			versionHandler.ServeHTTP(w, r)
+		// error pages endpoints:
+		//	- /
+		//	-	/{code}.html
+		//	- /{code}.htm
+		//	- /{code}
+		case method == http.MethodGet && (url == "/" || errorPageRegex.MatchString(url)):
+			errorPagesHandler.ServeHTTP(w, r)
+		// wrong requests handling
+		default:
+			switch {
+			case method == http.MethodHead:
+				w.WriteHeader(http.StatusNotFound)
+			case method == http.MethodGet:
+				http.NotFound(w, r)
+			default:
+				http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
+			}
+		}
+	})
+
+	// apply middleware
 	s.server.Handler = logreq.New(s.log, func(r *http.Request) bool {
 		// skip logging healthcheck requests
 		return strings.Contains(strings.ToLower(r.UserAgent()), "healthcheck")
 	})(s.server.Handler)
 
-	{ // register handlers (https://go.dev/blog/routing-enhancements)
-		var errorPageHandler = error_page.New()
-
-		s.mux.Handle("/", errorPageHandler)
-		s.mux.Handle("/{any}", errorPageHandler)
-
-		var liveHandler = live.New()
-
-		s.mux.Handle("GET /health/live", liveHandler)
-		s.mux.Handle("GET /healthz", liveHandler)
-		s.mux.Handle("GET /live", liveHandler)
-
-		s.mux.Handle("GET /version", version.New(appmeta.Version()))
-	}
-
 	return nil
 }
 

internal/http/server_test.go

@@ -0,0 +1,221 @@
+package http_test
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap"
+
+	"gh.tarampamp.am/error-pages/internal/config"
+	appHttp "gh.tarampamp.am/error-pages/internal/http"
+)
+
+func TestRouting(t *testing.T) {
+	var (
+		srv = appHttp.NewServer(context.Background(), zap.NewNop())
+		cfg = config.New()
+	)
+
+	require.NoError(t, srv.Register(&cfg))
+
+	var baseUrl, stopServer = startServer(t, &srv)
+
+	defer stopServer()
+
+	t.Run("health", func(t *testing.T) {
+		var routes = []string{"/health/live", "/health", "/healthz", "/live"}
+
+		t.Run("success (get)", func(t *testing.T) {
+			for _, route := range routes {
+				status, body, headers := sendRequest(t, http.MethodGet, baseUrl+route)
+
+				assert.Equal(t, http.StatusOK, status)
+				assert.NotEmpty(t, body)
+				assert.Contains(t, headers.Get("Content-Type"), "text/plain")
+			}
+		})
+
+		t.Run("success (head)", func(t *testing.T) {
+			for _, route := range routes {
+				status, body, headers := sendRequest(t, http.MethodHead, baseUrl+route)
+
+				assert.Equal(t, http.StatusOK, status)
+				assert.Empty(t, body)
+				assert.Empty(t, headers.Get("Content-Type"))
+			}
+		})
+
+		t.Run("method not allowed", func(t *testing.T) {
+			for _, route := range routes {
+				var url = baseUrl + route
+
+				for _, method := range []string{http.MethodDelete, http.MethodPatch, http.MethodPost, http.MethodPut} {
+					status, body, headers := sendRequest(t, method, url)
+
+					assert.Equal(t, http.StatusMethodNotAllowed, status)
+					assert.NotEmpty(t, body)
+					assert.Contains(t, headers.Get("Content-Type"), "text/plain")
+				}
+			}
+		})
+	})
+
+	t.Run("version", func(t *testing.T) {
+		var url = baseUrl + "/version"
+
+		t.Run("success (get)", func(t *testing.T) {
+			status, body, headers := sendRequest(t, http.MethodGet, url)
+
+			assert.Equal(t, http.StatusOK, status)
+			assert.NotEmpty(t, body)
+			assert.Contains(t, headers.Get("Content-Type"), "application/json")
+		})
+
+		t.Run("success (head)", func(t *testing.T) {
+			status, body, headers := sendRequest(t, http.MethodHead, url)
+
+			assert.Equal(t, http.StatusOK, status)
+			assert.Empty(t, body)
+			assert.Empty(t, headers.Get("Content-Type"))
+		})
+
+		t.Run("method not allowed", func(t *testing.T) {
+			for _, method := range []string{http.MethodDelete, http.MethodPatch, http.MethodPost, http.MethodPut} {
+				status, body, headers := sendRequest(t, method, url)
+
+				assert.Equal(t, http.StatusMethodNotAllowed, status)
+				assert.NotEmpty(t, body)
+				assert.Contains(t, headers.Get("Content-Type"), "text/plain")
+			}
+		})
+	})
+
+	t.Run("error page", func(t *testing.T) {
+		t.Skip("not implemented")
+	})
+
+	t.Run("errors handling", func(t *testing.T) {
+		var missingRoutes = []string{"/not-found", "/not-found/", "/not-found.html"}
+
+		t.Run("not found (get)", func(t *testing.T) {
+			for _, path := range missingRoutes {
+				status, body, headers := sendRequest(t, http.MethodGet, baseUrl+path)
+
+				assert.Equal(t, http.StatusNotFound, status)
+				assert.NotEmpty(t, body)
+				assert.Contains(t, headers.Get("Content-Type"), "text/plain")
+			}
+		})
+
+		t.Run("not found (head)", func(t *testing.T) {
+			for _, path := range missingRoutes {
+				status, body, headers := sendRequest(t, http.MethodHead, baseUrl+path)
+
+				assert.Equal(t, http.StatusNotFound, status)
+				assert.Empty(t, body)
+				assert.Empty(t, headers.Get("Content-Type"))
+			}
+		})
+
+		t.Run("methods not allowed", func(t *testing.T) {
+			for _, path := range missingRoutes {
+				for _, method := range []string{http.MethodDelete, http.MethodPatch, http.MethodPost, http.MethodPut} {
+					status, body, headers := sendRequest(t, method, baseUrl+path)
+
+					assert.Equal(t, http.StatusMethodNotAllowed, status)
+					assert.NotEmpty(t, body)
+					assert.Contains(t, headers.Get("Content-Type"), "text/plain")
+				}
+			}
+		})
+	})
+}
+
+// sendRequest is a helper function to send an HTTP request and return its status code, body, and headers.
+func sendRequest(t *testing.T, method, url string, headers ...map[string]string) (
+	status int,
+	body []byte,
+	_ http.Header,
+) {
+	t.Helper()
+
+	req, reqErr := http.NewRequest(method, url, nil)
+
+	require.NoError(t, reqErr)
+
+	if len(headers) > 0 {
+		for key, value := range headers[0] {
+			req.Header.Add(key, value)
+		}
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	require.NoError(t, err)
+
+	body, _ = io.ReadAll(resp.Body)
+
+	require.NoError(t, resp.Body.Close())
+
+	return resp.StatusCode, body, resp.Header
+}
+
+// startServer is a helper function to start an HTTP server and return its base URL and a stop function.
+func startServer(t *testing.T, srv *appHttp.Server) (_ string, stop func()) {
+	t.Helper()
+
+	var (
+		port     = getFreeTcpPort(t)
+		hostPort = fmt.Sprintf("%s:%d", "127.0.0.1", port)
+	)
+
+	go func() {
+		if err := srv.Start("127.0.0.1", port); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			assert.NoError(t, err)
+		}
+	}()
+
+	// wait until the server starts
+	for {
+		if conn, err := net.DialTimeout("tcp", hostPort, time.Second); err == nil {
+			require.NoError(t, conn.Close())
+
+			break
+		}
+
+		<-time.After(5 * time.Millisecond)
+	}
+
+	return fmt.Sprintf("http://%s", hostPort), func() { assert.NoError(t, srv.Stop(10*time.Millisecond)) }
+}
+
+// getFreeTcpPort is a helper function to get a free TCP port number.
+func getFreeTcpPort(t *testing.T) uint16 {
+	t.Helper()
+
+	l, lErr := net.Listen("tcp", "127.0.0.1:0")
+	require.NoError(t, lErr)
+
+	port := l.Addr().(*net.TCPAddr).Port
+	require.NoError(t, l.Close())
+
+	// make sure port is closed
+	for {
+		conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", port))
+		if err != nil {
+			break
+		}
+
+		require.NoError(t, conn.Close())
+		<-time.After(5 * time.Millisecond)
+	}
+
+	return uint16(port)
+}