[功能] 添加OpenRestyResolvers支持，优化DNS解析器配置和验证逻辑

openflare_agent/internal/config/config.go

@@ -33,6 +33,7 @@ type Config struct {
 	AgentVersion               string              `json:"-"`
 	NginxVersion               string              `json:"-"`
 	OpenrestyPath              string              `json:"openresty_path"`
+	OpenrestyResolvers         []string            `json:"openresty_resolvers,omitempty"`
 	OpenrestyContainerName     string              `json:"openresty_container_name"`
 	OpenrestyDockerImage       string              `json:"openresty_docker_image"`
 	DockerBinary               string              `json:"docker_binary"`
@@ -59,6 +60,7 @@ type configFile struct {
 	NodeName                   string              `json:"node_name"`
 	NodeIP                     string              `json:"node_ip"`
 	OpenrestyPath              string              `json:"openresty_path"`
+	OpenrestyResolvers         []string            `json:"openresty_resolvers"`
 	OpenrestyContainerName     string              `json:"openresty_container_name"`
 	OpenrestyDockerImage       string              `json:"openresty_docker_image"`
 	DockerBinary               string              `json:"docker_binary"`
@@ -93,6 +95,7 @@ func Load(path string) (*Config, error) {
 		NodeName:                   file.NodeName,
 		NodeIP:                     file.NodeIP,
 		OpenrestyPath:              file.OpenrestyPath,
+		OpenrestyResolvers:         append([]string{}, file.OpenrestyResolvers...),
 		OpenrestyContainerName:     file.OpenrestyContainerName,
 		OpenrestyDockerImage:       file.OpenrestyDockerImage,
 		DockerBinary:               file.DockerBinary,
@@ -121,6 +124,7 @@ func Load(path string) (*Config, error) {
 func applyDefaults(cfg *Config, baseDir string) {
 	baseDir = filepath.Clean(baseDir)
 	cfg.AgentVersion = AgentVersion
+	cfg.OpenrestyResolvers = normalizeResolverList(cfg.OpenrestyResolvers)
 	if cfg.OpenrestyContainerName == "" {
 		cfg.OpenrestyContainerName = "openflare-openresty"
 	}
@@ -290,6 +294,29 @@ func detectHostname() string {
 	return strings.TrimSpace(host)
 }
 
+func normalizeResolverList(values []string) []string {
+	if len(values) == 0 {
+		return nil
+	}
+	result := make([]string, 0, len(values))
+	seen := make(map[string]struct{}, len(values))
+	for _, value := range values {
+		trimmed := strings.TrimSpace(value)
+		if trimmed == "" {
+			continue
+		}
+		if _, ok := seen[trimmed]; ok {
+			continue
+		}
+		seen[trimmed] = struct{}{}
+		result = append(result, trimmed)
+	}
+	if len(result) == 0 {
+		return nil
+	}
+	return result
+}
+
 func firstNonEmpty(values ...string) string {
 	for _, value := range values {
 		if strings.TrimSpace(value) != "" {

openflare_agent/internal/config/config_test.go

@@ -120,6 +120,40 @@ func TestLoadPathModeKeepsExplicitPaths(t *testing.T) {
 	}
 }
 
+func TestLoadNormalizesExplicitResolvers(t *testing.T) {
+	dir := t.TempDir()
+	configPath := filepath.Join(dir, "agent.json")
+	payload := map[string]any{
+		"server_url":          "http://127.0.0.1:3000",
+		"agent_token":         "token",
+		"node_name":           "edge-01",
+		"node_ip":             "10.0.0.8",
+		"openresty_resolvers": []string{" 10.0.0.2 ", "10.0.0.2", "", "1.1.1.1"},
+	}
+	data, err := json.Marshal(payload)
+	if err != nil {
+		t.Fatalf("failed to marshal config: %v", err)
+	}
+	if err = os.WriteFile(configPath, data, 0o644); err != nil {
+		t.Fatalf("failed to write config: %v", err)
+	}
+
+	cfg, err := Load(configPath)
+	if err != nil {
+		t.Fatalf("Load failed: %v", err)
+	}
+
+	expected := []string{"10.0.0.2", "1.1.1.1"}
+	if len(cfg.OpenrestyResolvers) != len(expected) {
+		t.Fatalf("unexpected resolver count: %#v", cfg.OpenrestyResolvers)
+	}
+	for index, value := range expected {
+		if cfg.OpenrestyResolvers[index] != value {
+			t.Fatalf("unexpected resolver at %d: got %q want %q", index, cfg.OpenrestyResolvers[index], value)
+		}
+	}
+}
+
 func TestLoadUsesCustomDataDirForGeneratedFiles(t *testing.T) {
 	dir := t.TempDir()
 	configPath := filepath.Join(dir, "agent.json")
@@ -209,6 +243,7 @@ func TestSavePersistsMillisecondsAndOmitsRuntimeVersions(t *testing.T) {
 	cfg.NginxVersion = "1.27.1.2"
 	cfg.HeartbeatInterval = MillisecondDuration(5 * time.Second)
 	cfg.RequestTimeout = MillisecondDuration(7 * time.Second)
+	cfg.OpenrestyResolvers = []string{"10.0.0.2", "1.1.1.1"}
 
 	if err = cfg.Save(); err != nil {
 		t.Fatalf("Save failed: %v", err)
@@ -234,6 +269,10 @@ func TestSavePersistsMillisecondsAndOmitsRuntimeVersions(t *testing.T) {
 	if decoded["request_timeout"] != float64(7000) {
 		t.Fatalf("unexpected request timeout: %#v", decoded["request_timeout"])
 	}
+	resolvers, ok := decoded["openresty_resolvers"].([]any)
+	if !ok || len(resolvers) != 2 || resolvers[0] != "10.0.0.2" || resolvers[1] != "1.1.1.1" {
+		t.Fatalf("unexpected resolvers: %#v", decoded["openresty_resolvers"])
+	}
 	if decoded["openresty_observability_port"] != float64(defaultOpenRestyObservabilityPort) {
 		t.Fatalf("unexpected observability port: %#v", decoded["openresty_observability_port"])
 	}