fix: polaris get service name (#2615)

contrib/polaris/polaris.go

@@ -16,6 +16,7 @@ type Polaris struct {
 	registry  polaris.ProviderAPI
 	discovery polaris.ConsumerAPI
 	namespace string
+	service   string
 }
 
 // Option is polaris option.
@@ -28,6 +29,13 @@ func WithNamespace(ns string) Option {
 	}
 }
 
+// WithService set the current service name
+func WithService(service string) Option {
+	return func(o *Polaris) {
+		o.service = service
+	}
+}
+
 // New polaris Service governance.
 func New(sdk api.SDKContext, opts ...Option) Polaris {
 	op := Polaris{
@@ -78,14 +86,15 @@ func (p *Polaris) Registry(opts ...RegistryOption) (r *Registry) {
 	}
 }
 
-func (p *Polaris) Limiter(opts ...LimiterOption) (r *Limiter) {
+func (p *Polaris) Limiter(opts ...LimiterOption) (r Limiter) {
 	op := limiterOptions{
 		namespace: p.namespace,
+		service:   p.service,
 	}
 	for _, option := range opts {
 		option(&op)
 	}
-	return &Limiter{
+	return Limiter{
 		limitAPI: p.limit,
 		opts:     op,
 	}

contrib/polaris/ratelimit.go

@@ -19,7 +19,7 @@ var (
 	ErrLimitExceed = errors.New(429, "RATELIMIT", "service unavailable due to rate limit exceeded")
 )
 
-// Ratelimit ratelimiter middleware
+// Ratelimit Request rate limit middleware
 func Ratelimit(l Limiter) middleware.Middleware {
 	return func(handler middleware.Handler) middleware.Handler {
 		return func(ctx context.Context, req interface{}) (reply interface{}, err error) {
@@ -47,7 +47,7 @@ func Ratelimit(l Limiter) middleware.Middleware {
 				done(ratelimit.DoneInfo{Err: err})
 				return
 			}
-			return nil, errors.New(400, "Error with transport.FromServerContext", "Error with transport.FromServerContext")
+			return reply, nil
 		}
 	}
 }

contrib/polaris/router.go

@@ -21,71 +21,89 @@ import (
 	"github.com/go-kratos/kratos/v2/transport/http"
 )
 
+type router struct {
+	service string
+}
+
+type RouterOption func(o *router)
+
+// WithRouterService set the caller service name used by the route
+func WithRouterService(service string) RouterOption {
+	return func(o *router) {
+		o.service = service
+	}
+}
+
 // NodeFilter polaris dynamic router selector
-func (p *Polaris) NodeFilter() selector.NodeFilter {
+func (p *Polaris) NodeFilter(opts ...RouterOption) selector.NodeFilter {
+	o := router{service: p.service}
+	for _, opt := range opts {
+		opt(&o)
+	}
 	return func(ctx context.Context, nodes []selector.Node) []selector.Node {
 		if len(nodes) == 0 {
 			return nodes
 		}
+		req := &polaris.ProcessRoutersRequest{
+			ProcessRoutersRequest: model.ProcessRoutersRequest{
+				SourceService: model.ServiceInfo{Namespace: p.namespace, Service: o.service},
+				DstInstances:  buildPolarisInstance(p.namespace, nodes),
+			},
+		}
 		if appInfo, ok := kratos.FromContext(ctx); ok {
-			req := &polaris.ProcessRoutersRequest{
-				ProcessRoutersRequest: model.ProcessRoutersRequest{
-					SourceService: model.ServiceInfo{
-						Service:   appInfo.Name(),
-						Namespace: p.namespace,
-					},
-					DstInstances: buildPolarisInstance(p.namespace, nodes),
-				},
-			}
-			req.AddArguments(model.BuildCallerServiceArgument(p.namespace, appInfo.Name()))
+			req.SourceService.Service = appInfo.Name()
+		}
 
-			// process transport
-			if tr, ok := transport.FromServerContext(ctx); ok {
-				req.AddArguments(model.BuildMethodArgument(tr.Operation()))
-				req.AddArguments(model.BuildPathArgument(tr.Operation()))
+		req.AddArguments(model.BuildCallerServiceArgument(p.namespace, req.ProcessRoutersRequest.SourceService.Service))
 
-				for _, key := range tr.RequestHeader().Keys() {
-					req.AddArguments(model.BuildHeaderArgument(key, tr.RequestHeader().Get(key)))
-				}
+		// process transport
+		if tr, ok := transport.FromClientContext(ctx); ok {
+			req.AddArguments(model.BuildMethodArgument(tr.Operation()))
+			req.AddArguments(model.BuildPathArgument(tr.Operation()))
+
+			for _, key := range tr.RequestHeader().Keys() {
+				req.AddArguments(model.BuildHeaderArgument(strings.ToLower(key), tr.RequestHeader().Get(key)))
+			}
 
-				// http
-				if ht, ok := tr.(http.Transporter); ok {
-					req.AddArguments(model.BuildPathArgument(ht.Request().URL.Path))
-					req.AddArguments(model.BuildCallerIPArgument(ht.Request().RemoteAddr))
+			// http
+			if ht, ok := tr.(http.Transporter); ok {
+				req.AddArguments(model.BuildPathArgument(ht.Request().URL.Path))
+				req.AddArguments(model.BuildCallerIPArgument(ht.Request().RemoteAddr))
 
-					// cookie
-					for _, cookie := range ht.Request().Cookies() {
-						req.AddArguments(model.BuildCookieArgument(cookie.Name, cookie.Value))
-					}
+				// cookie
+				for _, cookie := range ht.Request().Cookies() {
+					req.AddArguments(model.BuildCookieArgument(cookie.Name, cookie.Value))
+				}
 
-					// url query
-					for key, values := range ht.Request().URL.Query() {
-						req.AddArguments(model.BuildQueryArgument(key, strings.Join(values, ",")))
-					}
+				// url query
+				for key, values := range ht.Request().URL.Query() {
+					req.AddArguments(model.BuildQueryArgument(key, strings.Join(values, ",")))
 				}
 			}
+		}
 
-			n := make(map[string]selector.Node, len(nodes))
+		n := make(map[string]selector.Node, len(nodes))
 
-			for _, node := range nodes {
-				n[node.Address()] = node
-			}
+		for _, node := range nodes {
+			n[node.Address()] = node
+		}
 
-			m, err := p.router.ProcessRouters(req)
-			if err != nil {
-				log.Errorf("polaris process routers failed, err=%v", err)
-				return nodes
-			}
+		m, err := p.router.ProcessRouters(req)
+		if err != nil {
+			log.Errorf("polaris process routers failed, err=%v", err)
+			return nodes
+		}
 
-			newNode := make([]selector.Node, 0, len(m.Instances))
-			for _, ins := range m.GetInstances() {
-				if v, ok := n[fmt.Sprintf("%s:%d", ins.GetHost(), ins.GetPort())]; ok {
-					newNode = append(newNode, v)
-				}
+		newNode := make([]selector.Node, 0, len(m.Instances))
+		for _, ins := range m.GetInstances() {
+			if v, ok := n[fmt.Sprintf("%s:%d", ins.GetHost(), ins.GetPort())]; ok {
+				newNode = append(newNode, v)
 			}
-			return newNode
 		}
-		return nodes
+		if len(newNode) == 0 {
+			return nodes
+		}
+		return newNode
 	}
 }