*: support proxy-protocol (#96)

.github/ISSUE_TEMPLATE/bug-report.md

@@ -18,7 +18,7 @@ Please answer these questions before submitting your issue. Thanks!
 
 ### 4. What is your version? (Required)
 
-<!-- Paste the output of weirproxy -V -->
-<!-- Paste the output of weirctl -V if related -->
+<!-- Paste the output of tiproxy version -->
+<!-- Paste the output of tiproxyctl version if related -->
 <!-- Paste the output of SELECT tidb_version()  if related -->
 

.github/pull_request_template.md

@@ -39,7 +39,7 @@ Notable changes
 
 - [ ] Has configuration change
 - [ ] Has HTTP API interfaces change (Don't forget to [add the declarative for API](https://github.com/tikv/pd/blob/master/docs/development.md#updating-api-documentation))
-- [ ] Has weirctl change
+- [ ] Has tiproxyctl change
 - [ ] Other user behavior changes
 
 ### Release note

Makefile

@@ -22,9 +22,10 @@ ifneq ($(RELEASE), "")
 endif
 BUILD_TAGS ?=
 LDFLAGS ?= 
+DEBUG ?=
 BUILDFLAGS := $(BUILDFLAGS) -gcflags '$(GCFLAGS)' -ldflags '$(LDFLAGS)' -tags '${BUILD_TAGS}'
 ifeq ("$(WITH_RACE)", "1")
-	BUILDFLAGS = $(BUILDFLAGS) -race
+	BUILDFLAGS += -race
 endif
 IMAGE_TAG ?= latest
 EXECUTABLE_TARGETS := $(patsubst cmd/%,cmd_%,$(wildcard cmd/*))

conf/namespace/example.yaml

@@ -1,4 +1,4 @@
-namespace: "example"
+namespace: "default"
 frontend:
   security:
 backend:

conf/proxy.yaml

@@ -4,6 +4,7 @@ proxy:
   tcp-keep-alive: true
   max-connections: 1000
   pd-addrs: "127.0.0.1:2379"
+  # proxy-protocol: "v2"
 metrics:
 api:
   addr: "0.0.0.0:3080"

lib/config/proxy.go

@@ -19,9 +19,14 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/pingcap/TiProxy/lib/util/errors"
 	"gopkg.in/yaml.v3"
 )
 
+var (
+	ErrUnsupportedProxyProtocolVersion = errors.New("unsupported proxy protocol version")
+)
+
 type Config struct {
 	Proxy    ProxyServer `yaml:"proxy,omitempty" toml:"proxy,omitempty" json:"proxy,omitempty"`
 	API      API         `yaml:"api,omitempty" toml:"api,omitempty" json:"api,omitempty"`
@@ -40,13 +45,13 @@ type Metrics struct {
 type ProxyServerOnline struct {
 	MaxConnections uint64 `yaml:"max-connections,omitempty" toml:"max-connections,omitempty" json:"max-connections,omitempty"`
 	TCPKeepAlive   bool   `yaml:"tcp-keep-alive,omitempty" toml:"tcp-keep-alive,omitempty" json:"tcp-keep-alive,omitempty"`
+	ProxyProtocol  string `yaml:"proxy-protocol,omitempty" toml:"proxy-protocol,omitempty" json:"proxy-protocol,omitempty"`
 }
 
 type ProxyServer struct {
-	Addr          string `yaml:"addr,omitempty" toml:"addr,omitempty" json:"addr,omitempty"`
-	PDAddrs       string `yaml:"pd-addrs,omitempty" toml:"pd-addrs,omitempty" json:"pd-addrs,omitempty"`
-	ProxyProtocol string `yaml:"proxy-protocol,omitempty" toml:"proxy-protocol,omitempty" json:"proxy-protocol,omitempty"`
-	ProxyServerOnline
+	Addr              string `yaml:"addr,omitempty" toml:"addr,omitempty" json:"addr,omitempty"`
+	PDAddrs           string `yaml:"pd-addrs,omitempty" toml:"pd-addrs,omitempty" json:"pd-addrs,omitempty"`
+	ProxyServerOnline `yaml:",inline" toml:",inline" json:",inline"`
 }
 
 type API struct {
@@ -123,6 +128,12 @@ func (cfg *Config) Check() error {
 		}
 		cfg.Workdir = filepath.Clean(d)
 	}
+	switch cfg.Proxy.ProxyProtocol {
+	case "v2":
+	case "":
+	default:
+		return errors.Wrapf(ErrUnsupportedProxyProtocolVersion, "%s", cfg.Proxy.ProxyProtocol)
+	}
 	return nil
 }
 

lib/config/proxy_test.go

@@ -15,6 +15,8 @@
 package config
 
 import (
+	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -33,6 +35,7 @@ var testProxyConfig = Config{
 		ProxyServerOnline: ProxyServerOnline{
 			MaxConnections: 1,
 			TCPKeepAlive:   true,
+			ProxyProtocol:  "v2",
 		},
 	},
 	API: API{
@@ -95,3 +98,38 @@ func TestProxyConfig(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, data1, data2)
 }
+
+func TestProxyCheck(t *testing.T) {
+	testcases := []struct {
+		pre  func(*testing.T, *Config)
+		post func(*testing.T, *Config)
+		err  error
+	}{
+		{
+			pre: func(t *testing.T, c *Config) {
+				c.Workdir = ""
+			},
+			post: func(t *testing.T, c *Config) {
+				cwd, err := os.Getwd()
+				require.NoError(t, err)
+				require.Equal(t, filepath.Clean(cwd), c.Workdir)
+			},
+		},
+		{
+			pre: func(t *testing.T, c *Config) {
+				c.Proxy.ProxyProtocol = "v1"
+			},
+			err: ErrUnsupportedProxyProtocolVersion,
+		},
+	}
+	for _, tc := range testcases {
+		cfg := testProxyConfig
+		tc.pre(t, &cfg)
+		if tc.err != nil {
+			require.ErrorIs(t, cfg.Check(), tc.err)
+			continue
+		}
+		require.NoError(t, cfg.Check())
+		tc.post(t, &cfg)
+	}
+}

pkg/manager/router/router.go

@@ -134,7 +134,7 @@ func NewScoreBasedRouter(logger *zap.Logger, cfg *config.BackendNamespace, clien
 	router.wg.Run(func() {
 		router.rebalanceLoop(childCtx)
 	})
-	return router, err
+	return router, nil
 }
 
 // Route implements Router.Route interface.