feat: add mcpServer in config map (#1953)

Author: Jing-ze

pkg/ingress/kube/configmap/config.go

@@ -40,6 +40,7 @@ type HigressConfig struct {
 	Upstream             *Upstream   `json:"upstream,omitempty"`
 	DisableXEnvoyHeaders bool        `json:"disableXEnvoyHeaders,omitempty"`
 	AddXRealIpHeader     bool        `json:"addXRealIpHeader,omitempty"`
+	McpServer            *McpServer  `json:"mcpServer,omitempty"`
 }
 
 func NewDefaultHigressConfig() *HigressConfig {
@@ -51,6 +52,7 @@ func NewDefaultHigressConfig() *HigressConfig {
 		Upstream:             globalOption.Upstream,
 		DisableXEnvoyHeaders: globalOption.DisableXEnvoyHeaders,
 		AddXRealIpHeader:     globalOption.AddXRealIpHeader,
+		McpServer:            NewDefaultMcpServer(),
 	}
 	return higressConfig
 }

pkg/ingress/kube/configmap/controller.go

@@ -89,6 +89,9 @@ func NewConfigmapMgr(XDSUpdater model.XDSUpdater, namespace string, higressConfi
 	globalOptionController := NewGlobalOptionController(namespace)
 	configmapMgr.AddItemControllers(globalOptionController)
 
+	mcpServerController := NewMcpServerController(namespace)
+	configmapMgr.AddItemControllers(mcpServerController)
+
 	configmapMgr.initEventHandlers()
 
 	return configmapMgr

pkg/ingress/kube/configmap/mcp_server.go

@@ -0,0 +1,327 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// 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 configmap
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+	"sync/atomic"
+
+	"github.com/alibaba/higress/pkg/ingress/kube/util"
+	. "github.com/alibaba/higress/pkg/ingress/log"
+	networking "istio.io/api/networking/v1alpha3"
+	"istio.io/istio/pkg/config"
+	"istio.io/istio/pkg/config/schema/gvk"
+)
+
+// RedisConfig defines the configuration for Redis connection
+type RedisConfig struct {
+	// The address of Redis server in the format of "host:port"
+	Address string `json:"address,omitempty"`
+	// The username for Redis authentication
+	Username string `json:"username,omitempty"`
+	// The password for Redis authentication
+	Password string `json:"password,omitempty"`
+	// The database index to use
+	DB int `json:"db,omitempty"`
+}
+
+// SSEServer defines the configuration for Server-Sent Events (SSE) server
+type SSEServer struct {
+	// The name of the SSE server
+	Name string `json:"name,omitempty"`
+	// The path where the SSE server will be mounted, the full path is (PATH + SsePathSuffix)
+	Path string `json:"path,omitempty"`
+	// The type of the SSE server
+	Type string `json:"type,omitempty"`
+	// Additional Config parameters for the real MCP server implementation
+	Config map[string]interface{} `json:"config,omitempty"`
+}
+
+// McpServer defines the configuration for MCP (Model Context Protocol) server
+type McpServer struct {
+	// Flag to control whether MCP server is enabled
+	Enable bool `json:"enable,omitempty"`
+	// Redis Config for MCP server
+	Redis *RedisConfig `json:"redis,omitempty"`
+	// The suffix to be appended to SSE paths, default is "/sse"
+	SsePathSuffix string `json:"sse_path_suffix,omitempty"`
+	// List of SSE servers Configs
+	Servers []*SSEServer `json:"servers,omitempty"`
+}
+
+func NewDefaultMcpServer() *McpServer {
+	return &McpServer{Enable: false}
+}
+
+const (
+	higressMcpServerEnvoyFilterName = "higress-config-mcp-server"
+)
+
+func validMcpServer(m *McpServer) error {
+	if m == nil {
+		return nil
+	}
+
+	if m.Enable && m.Redis == nil {
+		return errors.New("redis config cannot be empty when mcp server is enabled")
+	}
+
+	return nil
+}
+
+func compareMcpServer(old *McpServer, new *McpServer) (Result, error) {
+	if old == nil && new == nil {
+		return ResultNothing, nil
+	}
+
+	if new == nil {
+		return ResultDelete, nil
+	}
+
+	if !reflect.DeepEqual(old, new) {
+		return ResultReplace, nil
+	}
+
+	return ResultNothing, nil
+}
+
+func deepCopyMcpServer(mcp *McpServer) (*McpServer, error) {
+	newMcp := NewDefaultMcpServer()
+	newMcp.Enable = mcp.Enable
+
+	if mcp.Redis != nil {
+		newMcp.Redis = &RedisConfig{
+			Address:  mcp.Redis.Address,
+			Username: mcp.Redis.Username,
+			Password: mcp.Redis.Password,
+			DB:       mcp.Redis.DB,
+		}
+	}
+
+	newMcp.SsePathSuffix = mcp.SsePathSuffix
+
+	if len(mcp.Servers) > 0 {
+		newMcp.Servers = make([]*SSEServer, len(mcp.Servers))
+		for i, server := range mcp.Servers {
+			newServer := &SSEServer{
+				Name: server.Name,
+				Path: server.Path,
+				Type: server.Type,
+			}
+			if server.Config != nil {
+				newServer.Config = make(map[string]interface{})
+				for k, v := range server.Config {
+					newServer.Config[k] = v
+				}
+			}
+			newMcp.Servers[i] = newServer
+		}
+	}
+
+	return newMcp, nil
+}
+
+type McpServerController struct {
+	Namespace    string
+	mcpServer    atomic.Value
+	Name         string
+	eventHandler ItemEventHandler
+}
+
+func NewMcpServerController(namespace string) *McpServerController {
+	mcpController := &McpServerController{
+		Namespace: namespace,
+		mcpServer: atomic.Value{},
+		Name:      "mcpServer",
+	}
+	mcpController.SetMcpServer(NewDefaultMcpServer())
+	return mcpController
+}
+
+func (m *McpServerController) GetName() string {
+	return m.Name
+}
+
+func (m *McpServerController) SetMcpServer(mcp *McpServer) {
+	m.mcpServer.Store(mcp)
+}
+
+func (m *McpServerController) GetMcpServer() *McpServer {
+	value := m.mcpServer.Load()
+	if value != nil {
+		if mcp, ok := value.(*McpServer); ok {
+			return mcp
+		}
+	}
+	return nil
+}
+
+func (m *McpServerController) AddOrUpdateHigressConfig(name util.ClusterNamespacedName, old *HigressConfig, new *HigressConfig) error {
+	if err := validMcpServer(new.McpServer); err != nil {
+		IngressLog.Errorf("data:%+v convert to mcp server, error: %+v", new.McpServer, err)
+		return nil
+	}
+
+	result, _ := compareMcpServer(old.McpServer, new.McpServer)
+
+	switch result {
+	case ResultReplace:
+		if newMcp, err := deepCopyMcpServer(new.McpServer); err != nil {
+			IngressLog.Infof("mcp server deepcopy error:%v", err)
+		} else {
+			m.SetMcpServer(newMcp)
+			IngressLog.Infof("AddOrUpdate Higress config mcp server")
+			m.eventHandler(higressMcpServerEnvoyFilterName)
+			IngressLog.Infof("send event with filter name:%s", higressMcpServerEnvoyFilterName)
+		}
+	case ResultDelete:
+		m.SetMcpServer(NewDefaultMcpServer())
+		IngressLog.Infof("Delete Higress config mcp server")
+		m.eventHandler(higressMcpServerEnvoyFilterName)
+		IngressLog.Infof("send event with filter name:%s", higressMcpServerEnvoyFilterName)
+	}
+
+	return nil
+}
+
+func (m *McpServerController) ValidHigressConfig(higressConfig *HigressConfig) error {
+	if higressConfig == nil {
+		return nil
+	}
+	if higressConfig.McpServer == nil {
+		return nil
+	}
+
+	return validMcpServer(higressConfig.McpServer)
+}
+
+func (m *McpServerController) RegisterItemEventHandler(eventHandler ItemEventHandler) {
+	m.eventHandler = eventHandler
+}
+
+func (m *McpServerController) ConstructEnvoyFilters() ([]*config.Config, error) {
+	configs := make([]*config.Config, 0)
+	mcpServer := m.GetMcpServer()
+	namespace := m.Namespace
+
+	if mcpServer == nil || !mcpServer.Enable {
+		return configs, nil
+	}
+
+	mcpStruct := m.constructMcpServerStruct(mcpServer)
+	if mcpStruct == "" {
+		return configs, nil
+	}
+
+	config := &config.Config{
+		Meta: config.Meta{
+			GroupVersionKind: gvk.EnvoyFilter,
+			Name:             higressMcpServerEnvoyFilterName,
+			Namespace:        namespace,
+		},
+		Spec: &networking.EnvoyFilter{
+			ConfigPatches: []*networking.EnvoyFilter_EnvoyConfigObjectPatch{
+				{
+					ApplyTo: networking.EnvoyFilter_HTTP_FILTER,
+					Match: &networking.EnvoyFilter_EnvoyConfigObjectMatch{
+						Context: networking.EnvoyFilter_GATEWAY,
+						ObjectTypes: &networking.EnvoyFilter_EnvoyConfigObjectMatch_Listener{
+							Listener: &networking.EnvoyFilter_ListenerMatch{
+								FilterChain: &networking.EnvoyFilter_ListenerMatch_FilterChainMatch{
+									Filter: &networking.EnvoyFilter_ListenerMatch_FilterMatch{
+										Name: "envoy.filters.network.http_connection_manager",
+										SubFilter: &networking.EnvoyFilter_ListenerMatch_SubFilterMatch{
+											Name: "envoy.filters.http.cors",
+										},
+									},
+								},
+							},
+						},
+					},
+					Patch: &networking.EnvoyFilter_Patch{
+						Operation: networking.EnvoyFilter_Patch_INSERT_AFTER,
+						Value:     util.BuildPatchStruct(mcpStruct),
+					},
+				},
+			},
+		},
+	}
+
+	configs = append(configs, config)
+	return configs, nil
+}
+
+func (m *McpServerController) constructMcpServerStruct(mcp *McpServer) string {
+	// 构建 servers 配置
+	servers := "[]"
+	if len(mcp.Servers) > 0 {
+		serverConfigs := make([]string, len(mcp.Servers))
+		for i, server := range mcp.Servers {
+			serverConfig := fmt.Sprintf(`{
+				"name": "%s",
+				"path": "%s",
+				"type": "%s"`,
+				server.Name, server.Path, server.Type)
+
+			if len(server.Config) > 0 {
+				config, _ := json.Marshal(server.Config)
+				serverConfig += fmt.Sprintf(`,
+				"config": %s`, string(config))
+			}
+
+			serverConfig += "}"
+			serverConfigs[i] = serverConfig
+		}
+		servers = fmt.Sprintf("[%s]", strings.Join(serverConfigs, ","))
+	}
+
+	// 构建完整的配置结构
+	structFmt := `{
+		"name": "envoy.filters.http.golang",
+		"typed_config": {
+			"@type": "type.googleapis.com/envoy.extensions.filters.http.golang.v3alpha.Config",
+			"value": {
+				"library_id": "mcp-server",
+				"library_path": "/var/lib/istio/envoy/mcp-server.so",
+				"plugin_name": "mcp-server",
+				"plugin_config": {
+					"@type": "type.googleapis.com/xds.type.v3.TypedStruct",
+					"value": {
+						"redis": {
+							"address": "%s",
+							"username": "%s",
+							"password": "%s",
+							"db": %d
+						},
+						"sse_path_suffix": "%s",
+						"servers": %s
+					}
+				}
+			}
+		}
+	}`
+
+	return fmt.Sprintf(structFmt,
+		mcp.Redis.Address,
+		mcp.Redis.Username,
+		mcp.Redis.Password,
+		mcp.Redis.DB,
+		mcp.SsePathSuffix,
+		servers)
+}