1 files changed, 50 insertions, 0 deletions
diff --git a/netwerk/base/nsIStreamListenerTee.idl b/netwerk/base/nsIStreamListenerTee.idl
new file mode 100644
index 0000000000..d51bdf3c46
--- /dev/null
+++ b/netwerk/base/nsIStreamListenerTee.idl
@@ -0,0 +1,50 @@
+/* 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/. */
+
+#include "nsIStreamListener.idl"
+
+interface nsIOutputStream;
+interface nsIRequestObserver;
+interface nsIEventTarget;
+
+/**
+ * As data "flows" into a stream listener tee, it is copied to the output stream
+ * and then forwarded to the real listener.
+ */
+[scriptable, uuid(62b27fc1-6e8c-4225-8ad0-b9d44252973a)]
+interface nsIStreamListenerTee : nsIStreamListener
+{
+    /**
+     * Initalize the tee.
+     *
+     * @param listener
+     *    the original listener the tee will propagate onStartRequest,
+     *    onDataAvailable and onStopRequest notifications to, exceptions from
+     *    the listener will be propagated back to the channel
+     * @param sink
+     *    the stream the data coming from the channel will be written to,
+     *    should be blocking
+     * @param requestObserver
+     *    optional parameter, listener that gets only onStartRequest and
+     *    onStopRequest notifications; exceptions threw within this optional
+     *    observer are also propagated to the channel, but exceptions from
+     *    the original listener (listener parameter) are privileged
+     */
+    void init(in nsIStreamListener listener,
+              in nsIOutputStream sink,
+              [optional] in nsIRequestObserver requestObserver);
+
+    /**
+     * Initalize the tee like above, but with the extra parameter to make it
+     * possible to copy the output asynchronously
+     * @param anEventTarget
+     *    if set, this event-target is used to copy data to the output stream,
+     *    giving an asynchronous tee
+    */
+    void initAsync(in nsIStreamListener listener,
+                   in nsIEventTarget eventTarget,
+                   in nsIOutputStream sink,
+                   [optional] in nsIRequestObserver requestObserver);
+
+};