refactor(api-server): refactor NanotronClientRequest class

Refactor the NanotronClientRequest class in the api-server package.
This commit adds a new property `remoteAddress` to store the remote address of the client.
It also refactors the `getRemoteAddress` method to a private method `getRemoteAddress__` for internal use.

packages/api-server/src/api-client-request.ts

@@ -34,6 +34,8 @@ export class NanotronClientRequest {
 
   protected readonly logger_;
 
+  readonly remoteAddress: string | null;
+
   get headers(): HttpRequestHeaders {
     return this.raw_.headers;
   }
@@ -49,6 +51,9 @@ export class NanotronClientRequest {
     this.url = url;
     this.routeOption = routeOption;
 
+    // Get and store remote address.
+    this.remoteAddress = this.getRemoteAddress__();
+
     // Create logger.
     this.logger_ = createLogger('nt-client-request'); // TODO: add client ip
     this.logger_.logMethodArgs?.('new', url.debugId);
@@ -129,15 +134,7 @@ export class NanotronClientRequest {
     });
   }
 
-  getRemoteAddress(): string {
-    // prettier-ignore
-    return (
-      this.raw_.headers['x-forwarded-for']
-        ?.split(',')
-        .pop()
-        ?.trim() ||
-      this.raw_.socket.remoteAddress ||
-      'unknown'
-    );
+  private getRemoteAddress__(): string | null {
+    return this.raw_.headers['x-forwarded-for']?.split(',').pop()?.trim() || this.raw_.socket.remoteAddress || null;
   }
 }