linter: check AutoSyncInterval for etcd config (#44081)

build/BUILD.bazel

@@ -123,6 +123,7 @@ nogo(
                "//build/linter/asciicheck:asciicheck",
                "//build/linter/bodyclose:bodyclose",
                "//build/linter/durationcheck:durationcheck",
+               "//build/linter/etcdconfig:etcdconfig",
                "//build/linter/exportloopref:exportloopref",
                "//build/linter/forcetypeassert:forcetypeassert",
                "//build/linter/gofmt:gofmt",

build/linter/etcdconfig/BUILD.bazel

@@ -0,0 +1,12 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "etcdconfig",
+    srcs = ["analyzer.go"],
+    importpath = "github.com/pingcap/tidb/build/linter/etcdconfig",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@org_golang_x_tools//go/analysis",
+        "@org_golang_x_tools//go/analysis/passes/inspect",
+    ],
+)

build/linter/etcdconfig/analyzer.go

@@ -0,0 +1,100 @@
+// Copyright 2022 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package etcdconfig
+
+import (
+	"go/ast"
+
+	"golang.org/x/tools/go/analysis"
+	"golang.org/x/tools/go/analysis/passes/inspect"
+)
+
+// Analyzer is the analyzer struct of unconvert.
+var Analyzer = &analysis.Analyzer{
+	Name:     "etcdconfig",
+	Doc:      "Check necessary fields of etcd config",
+	Requires: []*analysis.Analyzer{inspect.Analyzer},
+	Run:      run,
+}
+
+const (
+	configPackagePath = "go.etcd.io/etcd/client/v3"
+	configPackageName = "clientv3"
+	configStructName  = "Config"
+)
+
+// Adapted from https://github.com/mdempsky/unconvert/blob/beb68d938016d2dec1d1b078054f4d3db25f97be/unconvert.go#L371-L414.
+func run(pass *analysis.Pass) (interface{}, error) {
+	for _, file := range pass.Files {
+		packageName := ""
+		for _, spec := range file.Imports {
+			if spec.Path.Value != "\""+configPackagePath+"\"" {
+				continue
+			}
+			if spec.Name != nil {
+				packageName = spec.Name.Name
+			} else {
+				packageName = configPackageName
+			}
+		}
+		if packageName == "" {
+			continue
+		}
+
+		for _, decl := range file.Decls {
+			ast.Inspect(decl, func(n ast.Node) bool {
+				lit, ok := n.(*ast.CompositeLit)
+				if !ok {
+					return true
+				}
+				tp, ok := lit.Type.(*ast.SelectorExpr)
+				if !ok {
+					return true
+				}
+				litPackage, ok := tp.X.(*ast.Ident)
+				if !ok {
+					return true
+				}
+				if litPackage.Name != packageName {
+					return true
+				}
+				if tp.Sel.Name != configStructName {
+					return true
+				}
+
+				found := false
+				for _, field := range lit.Elts {
+					kv, ok := field.(*ast.KeyValueExpr)
+					if !ok {
+						continue
+					}
+					key, ok := kv.Key.(*ast.Ident)
+					if !ok {
+						continue
+					}
+					if key.Name == "AutoSyncInterval" {
+						found = true
+						break
+					}
+				}
+				if !found {
+					pass.Reportf(lit.Pos(), "missing field AutoSyncInterval")
+				}
+				return true
+			})
+		}
+	}
+	return nil, nil
+}

build/nogo_config.json

@@ -916,5 +916,12 @@
       "/external/": "no need to vet third party code",
       ".*_generated\\.go$": "ignore generated code"
     }
+  },
+  "etcdconfig": {
+    "exclude_files": {
+      "parser/parser.go": "parser/parser.go code",
+      ".*_test.go": "ignore test code",
+      "external/": "no need to vet third party code"
+    }
   }
 }

dumpling/export/util.go

@@ -35,8 +35,9 @@ func getPdDDLIDs(pCtx context.Context, cli *clientv3.Client) ([]string, error) {
 
 func checkSameCluster(tctx *tcontext.Context, db *sql.DB, pdAddrs []string) (bool, error) {
 	cli, err := clientv3.New(clientv3.Config{
-		Endpoints:   pdAddrs,
-		DialTimeout: defaultEtcdDialTimeOut,
+		Endpoints:        pdAddrs,
+		DialTimeout:      defaultEtcdDialTimeOut,
+		AutoSyncInterval: 30 * time.Second,
 	})
 	if err != nil {
 		return false, errors.Trace(err)

util/etcd/etcd.go

@@ -78,9 +78,10 @@ func NewClient(cli *clientv3.Client, root string) *Client {
 // NewClientFromCfg returns a wrapped etcd client
 func NewClientFromCfg(endpoints []string, dialTimeout time.Duration, root string, security *tls.Config) (*Client, error) {
 	cli, err := clientv3.New(clientv3.Config{
-		Endpoints:   endpoints,
-		DialTimeout: dialTimeout,
-		TLS:         security,
+		Endpoints:        endpoints,
+		DialTimeout:      dialTimeout,
+		TLS:              security,
+		AutoSyncInterval: 30 * time.Second,
 	})
 	if err != nil {
 		return nil, errors.Trace(err)