feat: expose version identity in Go SDK

sdk/go/client.go

@@ -27,6 +27,18 @@ type Health struct {
 	Scope  string `json:"scope,omitempty"`
 }
 
+// VersionInfo 描述服务构建身份和当前协议版本，不包含主机、数据库或租户信息。
+type VersionInfo struct {
+	Version               string `json:"version"`                 // Version 发布版本或本地开发标识。
+	Revision              string `json:"revision"`                // Revision 不可变源码提交标识。
+	BuiltAt               string `json:"built_at"`                // BuiltAt 构建时间。
+	GoVersion             string `json:"go_version"`              // GoVersion 编译器版本。
+	HTTPProtocolVersion   string `json:"http_protocol_version"`   // HTTPProtocolVersion HTTP接口主版本。
+	WorkerProtocolVersion string `json:"worker_protocol_version"` // WorkerProtocolVersion Worker WebSocket子协议版本。
+	EventProtocolVersion  string `json:"event_protocol_version"`  // EventProtocolVersion Event WebSocket子协议版本。
+	WorkflowSchemaVersion int    `json:"workflow_schema_version"` // WorkflowSchemaVersion 流程定义结构版本。
+}
+
 // HTTPError exposes the status code without including sensitive response bodies.
 type HTTPError struct{ StatusCode int }
 
@@ -53,6 +65,40 @@ func (c *Client) Liveness(ctx context.Context) (Health, error) { return c.health
 func (c *Client) Readiness(ctx context.Context) (Health, error) {
 	return c.health(ctx, "/health/ready")
 }
+
+// Version returns build and protocol identity from the unauthenticated version endpoint.
+func (c *Client) Version(ctx context.Context) (VersionInfo, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.baseURL+"/version", nil)
+	if err != nil {
+		return VersionInfo{}, err
+	}
+	req.Header.Set("Accept", "application/json")
+	response, err := c.http.Do(req)
+	if err != nil {
+		return VersionInfo{}, err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return VersionInfo{}, &HTTPError{StatusCode: response.StatusCode}
+	}
+	const maxBody = 16 << 10
+	body, err := io.ReadAll(io.LimitReader(response.Body, maxBody+1))
+	if err != nil {
+		return VersionInfo{}, err
+	}
+	if len(body) > maxBody {
+		return VersionInfo{}, errors.New("Orbit version response exceeds limit")
+	}
+	var info VersionInfo
+	if err := json.Unmarshal(body, &info); err != nil {
+		return VersionInfo{}, fmt.Errorf("decode Orbit version response: %w", err)
+	}
+	if info.Version == "" || info.HTTPProtocolVersion == "" || info.WorkerProtocolVersion == "" || info.EventProtocolVersion == "" || info.WorkflowSchemaVersion == 0 {
+		return VersionInfo{}, errors.New("Orbit version response is missing identity")
+	}
+	return info, nil
+}
+
 func (c *Client) health(ctx context.Context, path string) (Health, error) {
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.baseURL+path, nil)
 	if err != nil {

sdk/go/client_test.go

@@ -15,6 +15,10 @@ func TestHealthContract(t *testing.T) {
 		if r.Method != "GET" || r.Header.Get("Accept") != "application/json" {
 			t.Error("incorrect request")
 		}
+		if r.URL.Path == "/version" {
+			_, _ = w.Write([]byte(`{"version":"1.2.3","revision":"abc","built_at":"now","go_version":"go1.27.1","http_protocol_version":"1","worker_protocol_version":"1","event_protocol_version":"1","workflow_schema_version":1}`))
+			return
+		}
 		if r.URL.Path == "/health/live" {
 			_, _ = w.Write([]byte(`{"status":"alive"}`))
 			return
@@ -31,6 +35,10 @@ func TestHealthContract(t *testing.T) {
 	if err != nil || live.Status != "alive" {
 		t.Fatalf("%+v %v", live, err)
 	}
+	info, err := client.Version(context.Background())
+	if err != nil || info.Version != "1.2.3" || info.Revision != "abc" || info.WorkflowSchemaVersion != 1 {
+		t.Fatalf("version=%+v err=%v", info, err)
+	}
 	_, err = client.Readiness(context.Background())
 	var status *orbit.HTTPError
 	if !errors.As(err, &status) || status.StatusCode != 503 || strings.Contains(err.Error(), "secret") {

sdk/go/examples/health/main.go

@@ -29,5 +29,9 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	fmt.Printf("liveness=%s readiness=%s scope=%s\n", live.Status, ready.Status, ready.Scope)
+	version, err := client.Version(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("liveness=%s readiness=%s scope=%s version=%s revision=%s\n", live.Status, ready.Status, ready.Scope, version.Version, version.Revision)
 }