RP: use persistent per-thread Request object

source/net/request_pool.d

@@ -23,10 +23,17 @@ class RequestPool {
   private int m_totalWorkers;
   private TaskPool m_taskPool;
   private Logger _l;
+  private Request[] m_requests;
 
   this(int totalWorkers = 4) {
     this.m_totalWorkers = totalWorkers;
     this._l = getLogger();
+
+    for (int i = 0; i < totalWorkers + 1; i++) {
+      Request rq = Request();
+      // TODO: add custom fields (such as user agent)
+      this.m_requests ~= rq;
+    }
   }
 
   void startBackground() {
@@ -49,10 +56,10 @@ class RequestPool {
   }
 
   Response m_run(PRequest request) {
-    Request rq = Request();
+    Request rq = this.m_requests[this.m_taskPool.workerIndex];
     rq.addHeaders(request.headers);
 
-    _l.debugF!"[%s] %s"(request.method, request.url);
+    _l.debugF!"[%d][%s] %s"(this.m_taskPool.workerIndex, request.method, request.url);
 
     Response rs;
 
@@ -70,7 +77,8 @@ class RequestPool {
       return null;
     }
 
-    _l.debugF!"[%s] %s result code: %d"(request.method, request.url, rs.code);
+    _l.debugF!"[%d][%s] %s result code: %d"(this.m_taskPool.workerIndex, request.method, request.url, rs
+        .code);
     return rs;
   }
 }