feat: Support adding a proxy server in between when forwarding requests to upstream (#2710)

Co-authored-by: 澄潭 <zty98751@alibaba-inc.com>

pkg/ingress/kube/common/controller.go

@@ -16,9 +16,8 @@ package common
 
 import (
 	"strings"
+	"time"
 
-	"github.com/alibaba/higress/pkg/cert"
-	"github.com/alibaba/higress/pkg/ingress/kube/annotations"
 	networking "istio.io/api/networking/v1alpha3"
 	"istio.io/istio/pilot/pkg/model"
 	"istio.io/istio/pkg/cluster"
@@ -26,6 +25,10 @@ import (
 	gatewaytool "istio.io/istio/pkg/config/gateway"
 	listerv1 "k8s.io/client-go/listers/core/v1"
 	"k8s.io/client-go/tools/cache"
+
+	"github.com/alibaba/higress/pkg/cert"
+	"github.com/alibaba/higress/pkg/common"
+	"github.com/alibaba/higress/pkg/ingress/kube/annotations"
 )
 
 type ServiceKey struct {
@@ -120,6 +123,68 @@ type WrapperDestinationRule struct {
 	ServiceKey      ServiceKey
 }
 
+type ServiceProxyConfig struct {
+	ProxyName        string
+	UpstreamProtocol common.Protocol
+	UpstreamSni      string
+}
+
+type ServiceWrapper struct {
+	ServiceName            string
+	ServiceEntry           *networking.ServiceEntry
+	DestinationRuleWrapper *WrapperDestinationRule
+	Suffix                 string
+	RegistryType           string
+	RegistryName           string
+	ProxyConfig            *ServiceProxyConfig
+	createTime             time.Time
+}
+
+func (sew *ServiceWrapper) DeepCopy() *ServiceWrapper {
+	res := &ServiceWrapper{}
+	*res = *sew
+	res.ServiceEntry = sew.ServiceEntry.DeepCopy()
+
+	if sew.DestinationRuleWrapper != nil {
+		res.DestinationRuleWrapper = sew.DestinationRuleWrapper
+		res.DestinationRuleWrapper.DestinationRule = sew.DestinationRuleWrapper.DestinationRule.DeepCopy()
+	}
+	return res
+}
+
+func (sew *ServiceWrapper) SetCreateTime(createTime time.Time) {
+	sew.createTime = createTime
+}
+
+func (sew *ServiceWrapper) GetCreateTime() time.Time {
+	return sew.createTime
+}
+
+type ProxyWrapper struct {
+	ProxyName    string
+	ListenerPort uint32
+	EnvoyFilter  *networking.EnvoyFilter
+	createTime   time.Time
+}
+
+func (pw *ProxyWrapper) DeepCopy() *ProxyWrapper {
+	res := &ProxyWrapper{}
+	*res = *pw
+
+	if pw.EnvoyFilter != nil {
+		res.EnvoyFilter = pw.EnvoyFilter.DeepCopy()
+	}
+	return res
+}
+
+func (pw *ProxyWrapper) SetCreateTime(createTime time.Time) {
+	pw.createTime = createTime
+}
+
+func (pw *ProxyWrapper) GetCreateTime() time.Time {
+	return pw.createTime
+}
+
 type IngressController interface {
 	// RegisterEventHandler adds a handler to receive config update events for a
 	// configuration type

pkg/ingress/kube/common/model.go

@@ -169,6 +169,10 @@ type ConvertOptions struct {
 
 	Service2TrafficPolicy map[ServiceKey]*WrapperTrafficPolicy
 
+	ServiceWrappers map[string]*ServiceWrapper
+
+	ProxyWrappers map[string]*ProxyWrapper
+
 	HasDefaultBackend bool
 }