Added --retry-wait option.

This option was once existed in aria2 but erased on 2009-09-20.  Now
it is resurrected once again.  We choose 2 as default value, but there
is no good theory behind it.  Now we retry HTTP download when remote
server returns 503 Service Unavailable if --retry-wait > 0. We also
added error code 29: HTTP_SERVICE_UNAVAILABLE.

1 files changed, 17 insertions, 3 deletions

diff --git a/src/FileEntry.cc b/src/FileEntry.cc
index 9fe560e9..262ae890 100644
--- a/src/FileEntry.cc
+++ b/src/FileEntry.cc
@@ -170,9 +170,23 @@ FileEntry::getRequest
         break;
       }
     }
-  } else {    
-    req = requestPool_.front();
-    requestPool_.pop_front();
+  } else {
+    // Skip Request object if it is still
+    // sleeping(Request::getWakeTime() < global::wallclock).  If all
+    // pooled objects are sleeping, return first one.  Caller should
+    // inspect returned object's getWakeTime().
+    std::deque<SharedHandle<Request> >::iterator i = requestPool_.begin();
+    std::deque<SharedHandle<Request> >::iterator eoi = requestPool_.end();
+    for(; i != eoi; ++i) {
+      if((*i)->getWakeTime() <= global::wallclock) {
+        break;
+      }
+    }
+    if(i == eoi) {
+      i = requestPool_.begin();
+    }
+    req = *i;
+    requestPool_.erase(i);
     inFlightRequests_.push_back(req);
     A2_LOG_DEBUG(fmt("Picked up from pool: %s", req->getUri().c_str()));
   }