feat: Add a minimal QUIC to TCP/UNIX proxy written in Go

.editorconfig

@@ -7,7 +7,7 @@ insert_final_newline = true
 [*.go]
 max_line_length = 88
 indent_style = tab
-indent_size = 4
+indent_size = 2
 
 [*.py]
 max_line_length = 88
@@ -16,6 +16,9 @@ max_line_length = 88
 indent_style = space
 indent_size = 4
 
+[*.md]
+trim_trailing_whitespace = false
+
 [.travis.yml]
 indent_style = space
 indent_size = 2

.gitignore

@@ -165,3 +165,6 @@ cython_debug/
 # IDEs
 .vscode/
 .vim/
+
+# Go binary
+/src/qedis-proxy/proxy

src/qedis-proxy/cmd/root.go

@@ -5,14 +5,17 @@ import (
 	"os"
 
 	"github.com/spf13/cobra"
+	"qedis/proxy/internal/proxy"
 )
 
 var rootCmd = &cobra.Command{
-	// TODO: add commands
+	Run: proxy.RunProxy,
 }
 
 func init() {
-	// TODO: add command options
+	rootCmd.PersistentFlags().StringP("listenAddr", "l", "127.0.0.1:6379", "The listening address (UDP)")
+	rootCmd.PersistentFlags().StringP("remoteAddr", "r", "127.0.0.1:6379", "The upstream (remote) address (TCP or socket path)")
+	rootCmd.PersistentFlags().StringP("remoteProto", "u", "tcp", "The upstream protocol either tcp or unix")
 }
 
 func Execute() {

src/qedis-proxy/go.mod

@@ -2,9 +2,24 @@ module qedis/proxy
 
 go 1.20
 
-require github.com/spf13/cobra v1.6.1
+require (
+	github.com/quic-go/quic-go v0.33.0
+	github.com/spf13/cobra v1.6.1
+)
 
 require (
+	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
+	github.com/golang/mock v1.6.0 // indirect
+	github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
 	github.com/inconshreveable/mousetrap v1.0.1 // indirect
+	github.com/onsi/ginkgo/v2 v2.2.0 // indirect
+	github.com/quic-go/qtls-go1-19 v0.2.1 // indirect
+	github.com/quic-go/qtls-go1-20 v0.1.1 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	golang.org/x/crypto v0.4.0 // indirect
+	golang.org/x/exp v0.0.0-20221205204356-47842c84f3db // indirect
+	golang.org/x/mod v0.6.0 // indirect
+	golang.org/x/net v0.4.0 // indirect
+	golang.org/x/sys v0.3.0 // indirect
+	golang.org/x/tools v0.2.0 // indirect
 )

src/qedis-proxy/go.sum

@@ -1,10 +1,80 @@
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+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
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src/qedis-proxy/internal/proxy/proxy.go

@@ -0,0 +1,53 @@
+package proxy
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/quic-go/quic-go"
+	"github.com/spf13/cobra"
+	"qedis/proxy/internal/tlsconfig"
+)
+
+func RunProxy(cmd *cobra.Command, args []string) {
+	listenProto := "quic"
+	listenAddr, _ := cmd.Flags().GetString("listenAddr")
+	remoteProto, _ := cmd.Flags().GetString("remoteProto")
+	remoteAddr, _ := cmd.Flags().GetString("remoteAddr")
+	fmt.Printf("Listening on: %s %s\nProxying to: %s %s\n\n", listenProto, listenAddr, remoteProto, remoteAddr)
+
+	tlsConfig, err := tlsconfig.GenerateTLSConfig()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	quicConfig := &quic.Config{
+		KeepAlivePeriod: time.Duration(10) * time.Second,
+	}
+	listener, err := quic.ListenAddr(listenAddr, tlsConfig, quicConfig)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer listener.Close()
+	ctx := context.Background()
+
+	for {
+		quicSession, err := listener.Accept(ctx)
+		if err != nil {
+			log.Println("Error accepting QUIC session:", err)
+			continue
+		}
+		go func() {
+			for {
+				quicStream, err := quicSession.AcceptStream(ctx)
+				if err != nil {
+					log.Println("Error accepting QUIC stream:", err)
+					return
+				}
+				go doProxy(quicStream, remoteProto, remoteAddr)
+			}
+		}()
+	}
+}

src/qedis-proxy/internal/proxy/quic.go

@@ -0,0 +1,37 @@
+package proxy
+
+import (
+	"io"
+	"log"
+	"net"
+
+	"github.com/quic-go/quic-go"
+)
+
+func doProxy(quicStream quic.Stream, remoteProto string, remoteAddr string) {
+	defer quicStream.Close()
+
+	conn, err := net.Dial(remoteProto, remoteAddr)
+	if err != nil {
+		log.Println("Error dialing remote", remoteProto, "address:", err)
+		return
+	}
+	defer conn.Close()
+	transferData(quicStream, conn)
+}
+
+func transferData(a, b io.ReadWriteCloser) {
+	done := make(chan bool)
+
+	go func() {
+		io.Copy(a, b)
+		done <- true
+	}()
+
+	go func() {
+		io.Copy(b, a)
+		done <- true
+	}()
+
+	<-done
+}

src/qedis-proxy/internal/tlsconfig/tlsconfig.go

@@ -0,0 +1,35 @@
+package tlsconfig
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/pem"
+	"math/big"
+)
+
+// GenerateTLSConfig generates a TLS config with a self-signed certificate.
+
+func GenerateTLSConfig() (*tls.Config, error) {
+	key, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		return nil, err
+	}
+	template := x509.Certificate{SerialNumber: big.NewInt(1)}
+	certDER, err := x509.CreateCertificate(rand.Reader, &template, &template, &key.PublicKey, key)
+	if err != nil {
+		return nil, err
+	}
+	keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)})
+	certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
+	tlsCert, err := tls.X509KeyPair(certPEM, keyPEM)
+	if err != nil {
+		return nil, err
+	}
+	return &tls.Config{
+		InsecureSkipVerify: true,
+		Certificates:       []tls.Certificate{tlsCert},
+		NextProtos:         []string{"proto"},
+	}, nil
+}