Add dispatcher logic

Signed-off-by: Yogesh Deshpande <[email protected]>

Author: yogeshbdeshpande

vts/trustedservices/dispatcher.go

@@ -2,13 +2,33 @@
 // SPDX-License-Identifier: Apache-2.0
 package trustedservices
 
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
 type clientDetails struct {
-	Type     string
-	Url      string
-	Insecure bool
-	CaCerts  []string
-	Hints    []string
+	Type     string   `json:"type"`
+	Url      string   `json:"url"`
+	Insecure bool     `json:"in-secure"`
+	CaCerts  []string `json:"caCerts"`
+	Hints    []string `json:"hint"`
 }
-type DispatchInfo struct {
+type Dispatcher struct {
 	ClientInfo map[string]clientDetails
 }
+
+var lvDispatcher Dispatcher
+
+// LoadDispatchTable loads the Dispatch Table from the configuration
+func LoadDispatchTable(fp string) error {
+	data, err := os.ReadFile(fp)
+	if err != nil {
+		return fmt.Errorf("error reading dispatch table from %s: %w", fp, err)
+	}
+	if err := json.Unmarshal(data, &lvDispatcher); err != nil {
+		return fmt.Errorf("error unmarshalling dispatch table: %w", err)
+	}
+	return nil
+}

vts/trustedservices/trustedservices_grpc.go

@@ -181,6 +181,12 @@ func (o *GRPC) Init(
 		opts = append(opts, grpc.Creds(creds))
 	}
 
+	if cfg.DispatchTable != "" {
+		if err := LoadDispatchTable(cfg.DispatchTable); err != nil {
+			return err
+		}
+	}
+
 	server := grpc.NewServer(opts...)
 	proto.RegisterVTSServer(server, o)