[VOL-785,VOL-786,VOL-1315,VOL-1316]
Initial commit of the affinity router's data plane
Change-Id: Iccc93b5526d5d2468b33eff7d8847e22fb88ef2d
diff --git a/afrouter/afrouter/round-robin-router.go b/afrouter/afrouter/round-robin-router.go
new file mode 100644
index 0000000..2ab8421
--- /dev/null
+++ b/afrouter/afrouter/round-robin-router.go
@@ -0,0 +1,131 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * 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.
+ */
+// gRPC affinity router with active/active backends
+
+package afrouter
+
+import (
+ "fmt"
+ "errors"
+ "google.golang.org/grpc"
+ "github.com/opencord/voltha-go/common/log"
+)
+
+type RoundRobinRouter struct {
+ name string
+ routerType int // TODO: Likely not needed.
+ grpcService string
+ bkndClstr *backendCluster
+ curBknd **backend
+}
+
+func NewRoundRobinRouter(rconf *RouterConfig, config *RouteConfig) (Router, error) {
+ var err error = nil
+ var rtrn_err bool = false
+ // Validate the configuration
+
+ log.Debug("Creating a new round robin router")
+ // A name must exist
+ if config.Name == "" {
+ log.Error("A router 'name' must be specified")
+ rtrn_err = true
+ }
+
+ if rconf.ProtoPackage == "" {
+ log.Error("A 'package' must be specified")
+ rtrn_err = true
+ }
+
+ if rconf.ProtoService == "" {
+ log.Error("A 'service' must be specified")
+ rtrn_err = true
+ }
+
+ var bptr *backend
+ bptr = nil
+ rr := RoundRobinRouter{
+ name:config.Name,
+ grpcService:rconf.ProtoService,
+ curBknd:&bptr,
+ }
+
+ // This has already been validated bfore this function
+ // is called so just use it.
+ for idx := range(rTypeNames) {
+ if config.Type == rTypeNames[idx] {
+ rr.routerType = idx
+ break
+ }
+ }
+
+ // Create the backend cluster or link to an existing one
+ ok := true
+ if rr.bkndClstr, ok = bClusters[config.backendCluster.Name]; ok == false {
+ if rr.bkndClstr, err = NewBackendCluster(config.backendCluster); err != nil {
+ log.Errorf("Could not create a backend for router %s", config.Name)
+ rtrn_err = true
+ }
+ }
+
+ if rtrn_err {
+ return rr,errors.New(fmt.Sprintf("Failed to create a new router '%s'",rr.name))
+ }
+
+ return rr,nil
+}
+
+func (rr RoundRobinRouter) GetMetaKeyVal(serverStream grpc.ServerStream) (string,string,error) {
+ return "","",nil
+}
+
+func (rr RoundRobinRouter) BackendCluster(s string, mk string) (*backendCluster,error) {
+ return rr.bkndClstr, nil
+}
+
+func (rr RoundRobinRouter) Name() (string) {
+ return rr.name
+}
+
+func(rr RoundRobinRouter) Route(sel interface{}) (*backend) {
+ var err error
+ switch sl := sel.(type) {
+ case *nbFrame:
+ // Since this is a round robin router just get the next backend
+ if *rr.curBknd, err = rr.bkndClstr.nextBackend(*rr.curBknd,BE_SEQ_RR); err == nil {
+ return *rr.curBknd
+ } else {
+ sl.err = err
+ return nil
+ }
+ default:
+ log.Errorf("Internal: invalid data type in Route call %v", sel);
+ return nil
+ }
+ log.Errorf("Round robin error %v", err);
+ return nil
+}
+
+func (rr RoundRobinRouter) Service() (string) {
+ return rr.grpcService
+}
+
+func (rr RoundRobinRouter) FindBackendCluster(string) (*backendCluster) {
+ return rr.bkndClstr
+}
+
+func (rr RoundRobinRouter) ReplyHandler(sel interface{}) error { // This is a no-op
+ return nil
+}