feat: h2c support for http client

go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/stretchr/testify v1.8.4
 	go.uber.org/mock v0.3.0
 	golang.org/x/exp v0.0.0-20231219160207-73b9e39aefca
+	golang.org/x/net v0.20.0
 )
 
 require (
@@ -29,8 +30,8 @@ require (
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.26.0 // indirect
 	golang.org/x/arch v0.6.0 // indirect
-	golang.org/x/net v0.19.0 // indirect
-	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -79,8 +79,8 @@ golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
-golang.org/x/net v0.19.0 h1:zTwKpTd2XuCqf8huc7Fo2iSy+4RHPd10s4KzeTnVr1c=
-golang.org/x/net v0.19.0/go.mod h1:CfAk/cbD4CthTvqiEl8NpboMuiuOYsAr/7NOjZJtv1U=
+golang.org/x/net v0.20.0 h1:aCL9BSgETF1k+blQaYUBx9hJ9LOGP3gAVemcZlf1Kpo=
+golang.org/x/net v0.20.0/go.mod h1:z8BVo6PvndSri0LbOE3hAn0apkU+1YvI6E70E9jsnvY=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -93,8 +93,8 @@ golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
-golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
+golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
@@ -106,6 +106,8 @@ golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/time v0.3.0 h1:rg5rLMjNzMS1RkNLzCG38eapWhnYLFYXDXj2gOlr8j4=
 golang.org/x/time v0.3.0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

http.go

@@ -3,11 +3,14 @@ package kutils
 import (
 	"bytes"
 	"context"
+	"crypto/tls"
+	"net"
 	"net/http"
 	"time"
 
 	"github.com/go-resty/resty/v2"
 	"github.com/hashicorp/go-retryablehttp"
+	"golang.org/x/net/http2"
 
 	"github.com/KyberNetwork/kutils/internal/json"
 )
@@ -21,6 +24,7 @@ type HttpCfg struct {
 	MaxIdleConns        int           // max idle connections for all hosts, default 100
 	MaxIdleConnsPerHost int           // max idle connections per host, default GOMAXPROCS+1
 	MaxConnsPerHost     int           // max total connections per host, default 0 (unlimited)
+	UseH2c              bool          // whether to use http2 h2c, default false
 	RetryCount          int           // retry count (exponential backoff), default 0
 	RetryWaitTime       time.Duration // first exponential backoff, default 100ms
 	RetryMaxWaitTime    time.Duration // max exponential backoff, default 2s
@@ -52,6 +56,18 @@ func (h *HttpCfg) NewRestyClient() (client *resty.Client) {
 			transport.MaxConnsPerHost = h.MaxConnsPerHost
 		}
 		client.SetTransport(transport)
+		if h.UseH2c {
+			if h2cTransport, err := http2.ConfigureTransports(transport); err == nil {
+				h2cTransport.AllowHTTP = true
+			}
+			client.SetTransport(&http2.Transport{
+				AllowHTTP: true,
+				DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
+					var d net.Dialer
+					return d.DialContext(ctx, network, addr)
+				},
+			})
+		}
 	}
 
 	client.SetBaseURL(h.BaseUrl).

http_test.go

@@ -1,16 +1,20 @@
 package kutils
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
+	"net"
 	"net/http"
 	"net/url"
 	"testing"
 	"time"
 
 	"github.com/go-resty/resty/v2"
 	"github.com/stretchr/testify/assert"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
 )
 
 func TestHttpCfg_NewRestyClient(t *testing.T) {
@@ -160,3 +164,87 @@ func Test_retryableHttpError(t *testing.T) {
 		})
 	}
 }
+
+func Test_h2c(t *testing.T) {
+	body := "hello"
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_, _ = w.Write([]byte(body))
+		assert.Nil(t, r.TLS, nil)
+	})
+	h2s := &http2.Server{}
+	h2cHandler := h2c.NewHandler(handler, h2s)
+	tests := []struct {
+		name          string
+		serverHandler http.Handler
+		clientCfg     *HttpCfg
+		wantErr       assert.ErrorAssertionFunc
+		expects       func(*testing.T, *resty.Response)
+	}{
+		{
+			"h1 server, h1 client",
+			handler,
+			&HttpCfg{},
+			assert.NoError,
+			func(t *testing.T, resp *resty.Response) {
+				assert.Equal(t, "HTTP/1.1", resp.Proto())
+				assert.Equal(t, http.StatusOK, resp.StatusCode())
+				assert.Equal(t, body, resp.String())
+			},
+		},
+		{
+			"h1 server, h2c client",
+			handler,
+			&HttpCfg{UseH2c: true},
+			assert.Error,
+			nil,
+		},
+		{
+			"h2 server, h1 client",
+			h2cHandler,
+			&HttpCfg{},
+			assert.NoError,
+			func(t *testing.T, resp *resty.Response) {
+				assert.Equal(t, "HTTP/1.1", resp.Proto())
+				assert.Equal(t, http.StatusOK, resp.StatusCode())
+				assert.Equal(t, body, resp.String())
+			},
+		},
+		{
+			"h2 server, h2c client",
+			h2cHandler,
+			&HttpCfg{UseH2c: true},
+			assert.NoError,
+			func(t *testing.T, resp *resty.Response) {
+				assert.Equal(t, "HTTP/2.0", resp.Proto())
+				assert.Equal(t, http.StatusOK, resp.StatusCode())
+				assert.Equal(t, body, resp.String())
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ln, err := net.Listen("tcp", "127.0.0.1:")
+			assert.NoError(t, err)
+			srv := &http.Server{
+				Addr:    ln.Addr().String(),
+				Handler: tt.serverHandler,
+			}
+
+			go func() {
+				_ = srv.Serve(ln)
+			}()
+			defer func(srv *http.Server, ctx context.Context) {
+				_ = srv.Shutdown(ctx)
+			}(srv, context.Background())
+
+			client := tt.clientCfg.NewRestyClient()
+			resp, err := client.R().EnableTrace().Get("http://" + srv.Addr)
+
+			tt.wantErr(t, err)
+			if tt.expects != nil {
+				tt.expects(t, resp)
+			}
+		})
+	}
+}