1 files changed, 84 insertions, 0 deletions
diff --git a/netwerk/protocol/http/NullHttpTransaction.h b/netwerk/protocol/http/NullHttpTransaction.h
new file mode 100644
index 0000000000..04f80a9b3f
--- /dev/null
+++ b/netwerk/protocol/http/NullHttpTransaction.h
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_net_NullHttpTransaction_h
+#define mozilla_net_NullHttpTransaction_h
+
+#include "nsAHttpTransaction.h"
+#include "mozilla/Attributes.h"
+
+// This is the minimal nsAHttpTransaction implementation. A NullHttpTransaction
+// can be used to drive connection level semantics (such as SSL handshakes
+// tunnels) so that a nsHttpConnection becomes fully established in
+// anticipation of a real transaction needing to use it soon.
+
+class nsIHttpActivityObserver;
+
+namespace mozilla { namespace net {
+
+class nsAHttpConnection;
+class nsHttpConnectionInfo;
+class nsHttpRequestHead;
+
+// 6c445340-3b82-4345-8efa-4902c3b8805a
+#define NS_NULLHTTPTRANSACTION_IID \
+{ 0x6c445340, 0x3b82, 0x4345, {0x8e, 0xfa, 0x49, 0x02, 0xc3, 0xb8, 0x80, 0x5a }}
+
+class NullHttpTransaction : public nsAHttpTransaction
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_NULLHTTPTRANSACTION_IID)
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSAHTTPTRANSACTION
+
+  NullHttpTransaction(nsHttpConnectionInfo *ci,
+                      nsIInterfaceRequestor *callbacks,
+                      uint32_t caps);
+
+  bool Claim();
+
+  // Overload of nsAHttpTransaction methods
+  bool IsNullTransaction() override final { return true; }
+  NullHttpTransaction *QueryNullTransaction() override final { return this; }
+  bool ResponseTimeoutEnabled() const override final {return true; }
+  PRIntervalTime ResponseTimeout() override final
+  {
+    return PR_SecondsToInterval(15);
+  }
+
+protected:
+  virtual ~NullHttpTransaction();
+
+private:
+  nsresult mStatus;
+protected:
+  uint32_t mCaps;
+  nsHttpRequestHead *mRequestHead;
+private:
+  // mCapsToClear holds flags that should be cleared in mCaps, e.g. unset
+  // NS_HTTP_REFRESH_DNS when DNS refresh request has completed to avoid
+  // redundant requests on the network. The member itself is atomic, but
+  // access to it from the networking thread may happen either before or
+  // after the main thread modifies it. To deal with raciness, only unsetting
+  // bitfields should be allowed: 'lost races' will thus err on the
+  // conservative side, e.g. by going ahead with a 2nd DNS refresh.
+  Atomic<uint32_t> mCapsToClear;
+  bool mIsDone;
+  bool mClaimed;
+
+protected:
+  RefPtr<nsAHttpConnection> mConnection;
+  nsCOMPtr<nsIInterfaceRequestor> mCallbacks;
+  RefPtr<nsHttpConnectionInfo> mConnectionInfo;
+  nsCOMPtr<nsIHttpActivityObserver> mActivityDistributor;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(NullHttpTransaction, NS_NULLHTTPTRANSACTION_IID)
+
+} // namespace net
+} // namespace mozilla
+
+#endif // mozilla_net_NullHttpTransaction_h