Use environment variables with default for DaprClient

Signed-off-by: Shubham Sharma <[email protected]>

Author: shubham1172

src/implementation/Client/DaprClient.ts

@@ -33,6 +33,7 @@ import HTTPClient from './HTTPClient/HTTPClient';
 
 import CommunicationProtocolEnum from '../../enum/CommunicationProtocol.enum';
 import { DaprClientOptions } from '../../types/DaprClientOptions';
+import { Settings } from '../../utils/Settings.util';
 
 export default class DaprClient {
   readonly daprHost: string;
@@ -52,15 +53,15 @@ export default class DaprClient {
   readonly actor: IClientActorBuilder;
 
   constructor(
-    daprHost: string
-    , daprPort: string
+    daprHost?: string
+    , daprPort?: string
     , communicationProtocol: CommunicationProtocolEnum = CommunicationProtocolEnum.HTTP
     , options: DaprClientOptions = {
       isKeepAlive: true
     }
   ) {
-    this.daprHost = daprHost;
-    this.daprPort = daprPort;
+    this.daprHost = daprHost ?? Settings.getDefaultHost();
+    this.daprPort = daprPort ?? Settings.getDefaultPort(communicationProtocol);
     this.communicationProtocol = communicationProtocol;
     this.options = options;
 

src/utils/Settings.util.ts

@@ -0,0 +1,28 @@
+import CommunicationProtocolEnum from "../enum/CommunicationProtocol.enum";
+
+export class Settings {
+    private static readonly defaultHost: string = "127.0.0.1";
+    private static readonly defaultHttpPort: string = "3500";
+    private static readonly defaultGrpcPort: string = "50001";
+
+    static getDefaultHost(): string {
+        return Settings.defaultHost;
+    }
+
+    static getDefaultHttpPort(): string {
+        return process.env.DAPR_HTTP_PORT ?? Settings.defaultHttpPort;
+    }
+
+    static getDefaultGrpcPort(): string {
+        return process.env.DAPR_GRPC_PORT ?? Settings.defaultGrpcPort;
+    }
+
+    static getDefaultPort(communicationProtocolEnum: CommunicationProtocolEnum): string {
+        switch (communicationProtocolEnum) {
+            case CommunicationProtocolEnum.GRPC:
+                return this.getDefaultGrpcPort();
+            default:
+                return this.getDefaultHttpPort();
+        }
+    }
+}