handler/meter: add HTTPHandlerFunc method

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

README.md

@@ -1,5 +1,5 @@
 # HTTP Server
-![Coverage](https://img.shields.io/badge/Coverage-3.5%25-red)
+![Coverage](https://img.shields.io/badge/Coverage-5.1%25-red)
 
 The HTTP Server is a go-micro.Server. It's a partial implementation which strips out codecs, transports, etc but enables you 
 to create a HTTP Server that could potentially be used for REST based API services.

handler.go

@@ -9,7 +9,6 @@ import (
 	"slices"
 	"strconv"
 	"strings"
-	"sync"
 	"time"
 
 	"go.unistack.org/micro/v4/errors"
@@ -46,7 +45,6 @@ type httpHandler struct {
 	handlers *rhttp.Trie
 	name     string
 	sopts    server.Options
-	sync.RWMutex
 }
 
 func (h *httpHandler) Name() string {

handler/meter/meter.go

@@ -4,7 +4,9 @@ import (
 	"bytes"
 	"compress/gzip"
 	"context"
+	"fmt"
 	"io"
+	http "net/http"
 	"strings"
 	"sync"
 
@@ -85,20 +87,10 @@ func NewHandler(opts ...Option) *Handler {
 	return &Handler{Options: options}
 }
 
-func (h *Handler) Metrics(ctx context.Context, req *codecpb.Frame, rsp *codecpb.Frame) error {
-	log, ok := logger.FromContext(ctx)
-	if !ok {
-		log = logger.DefaultLogger
-	}
-
-	buf := bufPool.Get().(*bytes.Buffer)
-	defer bufPool.Put(buf)
-	buf.Reset()
-
-	w := io.Writer(buf)
-
-	if md, ok := metadata.FromIncomingContext(ctx); ok && gzipAccepted(md) && !h.Options.DisableCompress {
-		httpsrv.AppendResponseMetadata(ctx, metadata.Pairs(contentEncodingHeader, "gzip"))
+func (h *Handler) HTTPHandlerFunc(w http.ResponseWriter, r *http.Request) {
+	var wr io.Writer
+	if v := r.Header.Get(acceptEncodingHeader); strings.Contains(v, "gzip") && !h.Options.DisableCompress {
+		w.Header().Add(contentEncodingHeader, "gzip")
 
 		gz := gzipPool.Get().(*gzip.Writer)
 		defer gzipPool.Put(gz)
@@ -106,18 +98,75 @@ func (h *Handler) Metrics(ctx context.Context, req *codecpb.Frame, rsp *codecpb.
 		gz.Reset(w)
 		defer gz.Close()
 
-		w = gz
+		wr = gz
+	} else {
+		wr = w
 	}
 
-	if err := h.Options.Meter.Write(w, h.Options.MeterOptions...); err != nil {
-		log.Error(ctx, "http/meter write failed", err)
-		return nil
+	if err := h.Options.Meter.Write(wr, h.Options.MeterOptions...); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		return
 	}
 
 	// gz.Flush() must be called after writing metrics to ensure buffered data is written to the underlying writer.
-	if gz, ok := w.(*gzip.Writer); ok {
+	if gz, ok := wr.(*gzip.Writer); ok {
 		gz.Flush()
 	}
+}
+
+func (h *Handler) Metrics(ctx context.Context, req *codecpb.Frame, rsp *codecpb.Frame) error {
+	log, ok := logger.FromContext(ctx)
+	if !ok {
+		log = logger.DefaultLogger
+	}
+
+	var err error
+
+	if md, ok := metadata.FromIncomingContext(ctx); ok && gzipAccepted(md) && !h.Options.DisableCompress {
+		err = h.writeMetricsGzip(ctx, rsp)
+	} else {
+		err = h.writeMetricsPlain(ctx, rsp)
+	}
+
+	if err != nil {
+		log.Error(ctx, "http/meter write failed", err)
+	}
+
+	return nil
+}
+
+func (h *Handler) writeMetricsGzip(ctx context.Context, rsp *codecpb.Frame) error {
+	httpsrv.AppendResponseMetadata(ctx, metadata.Pairs(contentEncodingHeader, "gzip"))
+
+	buf := bufPool.Get().(*bytes.Buffer)
+	defer bufPool.Put(buf)
+	buf.Reset()
+
+	gz := gzipPool.Get().(*gzip.Writer)
+	defer gzipPool.Put(gz)
+	gz.Reset(buf)
+
+	if err := h.Options.Meter.Write(gz, h.Options.MeterOptions...); err != nil {
+		return fmt.Errorf("meter write: %w", err)
+	}
+
+	if err := gz.Close(); err != nil {
+		return fmt.Errorf("gzip close: %w", err)
+	}
+
+	rsp.Data = buf.Bytes()
+
+	return nil
+}
+
+func (h *Handler) writeMetricsPlain(_ context.Context, rsp *codecpb.Frame) error {
+	buf := bufPool.Get().(*bytes.Buffer)
+	defer bufPool.Put(buf)
+	buf.Reset()
+
+	if err := h.Options.Meter.Write(buf, h.Options.MeterOptions...); err != nil {
+		return fmt.Errorf("meter write: %w", err)
+	}
 
 	rsp.Data = buf.Bytes()
 

http.go

@@ -36,18 +36,18 @@ type Server struct {
 	stateReady   *atomic.Uint32
 	stateHealth  *atomic.Uint32
 	registerRPC  bool
-	sync.RWMutex
-	registered bool
-	init       bool
+	mu           sync.RWMutex
+	registered   bool
+	init         bool
 }
 
 func (h *Server) newCodec(ct string) (codec.Codec, error) {
 	if idx := strings.IndexRune(ct, ';'); idx >= 0 {
 		ct = ct[:idx]
 	}
-	h.RLock()
+	h.mu.RLock()
 	cf, ok := h.opts.Codecs[ct]
-	h.RUnlock()
+	h.mu.RUnlock()
 	if ok {
 		return cf, nil
 	}
@@ -55,9 +55,9 @@ func (h *Server) newCodec(ct string) (codec.Codec, error) {
 }
 
 func (h *Server) Options() server.Options {
-	h.Lock()
+	h.mu.Lock()
 	opts := h.opts
-	h.Unlock()
+	h.mu.Unlock()
 	return opts
 }
 
@@ -66,7 +66,7 @@ func (h *Server) Init(opts ...server.Option) error {
 		return nil
 	}
 
-	h.Lock()
+	h.mu.Lock()
 
 	for _, o := range opts {
 		o(&h.opts)
@@ -89,41 +89,41 @@ func (h *Server) Init(opts ...server.Option) error {
 		for pm, ps := range phs.h {
 			for pp, ph := range ps {
 				if err := h.pathHandlers.Insert([]string{pm}, pp, ph); err != nil {
-					h.Unlock()
+					h.mu.Unlock()
 					return err
 				}
 			}
 		}
 	}
-	h.Unlock()
+	h.mu.Unlock()
 
-	h.RLock()
+	h.mu.RLock()
 	if err := h.opts.Register.Init(); err != nil {
-		h.RUnlock()
+		h.mu.RUnlock()
 		return err
 	}
 	if err := h.opts.Broker.Init(); err != nil {
-		h.RUnlock()
+		h.mu.RUnlock()
 		return err
 	}
 	if err := h.opts.Tracer.Init(); err != nil {
-		h.RUnlock()
+		h.mu.RUnlock()
 		return err
 	}
 	if err := h.opts.Logger.Init(); err != nil {
-		h.RUnlock()
+		h.mu.RUnlock()
 		return err
 	}
 	if err := h.opts.Meter.Init(); err != nil {
-		h.RUnlock()
+		h.mu.RUnlock()
 		return err
 	}
 
-	h.RUnlock()
+	h.mu.RUnlock()
 
-	h.Lock()
+	h.mu.Lock()
 	h.init = true
-	h.Unlock()
+	h.mu.Unlock()
 
 	return nil
 }
@@ -132,27 +132,27 @@ func (h *Server) Handle(handler server.Handler) error {
 	// passed unknown handler
 	hdlr, ok := handler.(*httpHandler)
 	if !ok {
-		h.Lock()
+		h.mu.Lock()
 		h.hd = handler
-		h.Unlock()
+		h.mu.Unlock()
 		return nil
 	}
 
 	// passed http.Handler like some muxer
 	if _, ok := hdlr.hd.(http.Handler); ok {
-		h.Lock()
+		h.mu.Lock()
 		h.hd = handler
-		h.Unlock()
+		h.mu.Unlock()
 		return nil
 	}
 
 	// passed micro compat handler
-	h.Lock()
+	h.mu.Lock()
 	if h.handlers == nil {
 		h.handlers = make(map[string]server.Handler)
 	}
 	h.handlers[handler.Name()] = handler
-	h.Unlock()
+	h.mu.Unlock()
 
 	return nil
 }
@@ -294,10 +294,10 @@ func (h *Server) NewHandler(handler interface{}, opts ...server.HandlerOption) s
 }
 
 func (h *Server) Register() error {
-	h.RLock()
+	h.mu.RLock()
 	rsvc := h.rsvc
 	config := h.opts
-	h.RUnlock()
+	h.mu.RUnlock()
 
 	// if service already filled, reuse it and return early
 	if rsvc != nil {
@@ -312,9 +312,9 @@ func (h *Server) Register() error {
 		return err
 	}
 
-	h.RLock()
+	h.mu.RLock()
 	registered := h.registered
-	h.RUnlock()
+	h.mu.RUnlock()
 
 	if !registered {
 		if config.Logger.V(logger.InfoLevel) {
@@ -332,19 +332,19 @@ func (h *Server) Register() error {
 		return nil
 	}
 
-	h.Lock()
+	h.mu.Lock()
 
 	h.registered = true
 	h.rsvc = service
-	h.Unlock()
+	h.mu.Unlock()
 
 	return nil
 }
 
 func (h *Server) Deregister() error {
-	h.RLock()
+	h.mu.RLock()
 	config := h.opts
-	h.RUnlock()
+	h.mu.RUnlock()
 
 	service, err := server.NewRegisterService(h)
 	if err != nil {
@@ -359,24 +359,24 @@ func (h *Server) Deregister() error {
 		return err
 	}
 
-	h.Lock()
+	h.mu.Lock()
 	h.rsvc = nil
 
 	if !h.registered {
-		h.Unlock()
+		h.mu.Unlock()
 		return nil
 	}
 
 	h.registered = false
 
-	h.Unlock()
+	h.mu.Unlock()
 	return nil
 }
 
 func (h *Server) Start() error {
-	h.RLock()
+	h.mu.RLock()
 	config := h.opts
-	h.RUnlock()
+	h.mu.RUnlock()
 
 	// micro: config.Transport.Listen(config.Address)
 	var ts net.Listener
@@ -406,9 +406,9 @@ func (h *Server) Start() error {
 		config.Logger.Info(config.Context, "Listening on "+ts.Addr().String())
 	}
 
-	h.Lock()
+	h.mu.Lock()
 	h.opts.Address = ts.Addr().String()
-	h.Unlock()
+	h.mu.Unlock()
 
 	var handler http.Handler
 
@@ -499,9 +499,9 @@ func (h *Server) Start() error {
 			select {
 			// register self on interval
 			case <-t.C:
-				h.RLock()
+				h.mu.RLock()
 				registered := h.registered
-				h.RUnlock()
+				h.mu.RUnlock()
 				rerr := config.RegisterCheck(h.opts.Context)
 				// nolint: nestif
 				if rerr != nil && registered {