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diff --git a/netwerk/protocol/http/nsIHttpActivityObserver.idl b/netwerk/protocol/http/nsIHttpActivityObserver.idl
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+/* 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 "nsISupports.idl"
+
+/**
+ * nsIHttpActivityObserver
+ *
+ * This interface provides a way for http activities to be reported
+ * to observers.
+ */
+[scriptable, uuid(412880C8-6C36-48d8-BF8F-84F91F892503)]
+interface nsIHttpActivityObserver : nsISupports
+{
+ /**
+ * observe activity from the http transport
+ *
+ * @param aHttpChannel
+ * nsISupports interface for the the http channel that
+ * generated this activity
+ * @param aActivityType
+ * The value of this aActivityType will be one of
+ * ACTIVITY_TYPE_SOCKET_TRANSPORT or
+ * ACTIVITY_TYPE_HTTP_TRANSACTION
+ * @param aActivitySubtype
+ * The value of this aActivitySubtype, will be depend
+ * on the value of aActivityType. When aActivityType
+ * is ACTIVITY_TYPE_SOCKET_TRANSPORT
+ * aActivitySubtype will be one of the
+ * nsISocketTransport::STATUS_???? values defined in
+ * nsISocketTransport.idl
+ * OR when aActivityType
+ * is ACTIVITY_TYPE_HTTP_TRANSACTION
+ * aActivitySubtype will be one of the
+ * nsIHttpActivityObserver::ACTIVITY_SUBTYPE_???? values
+ * defined below
+ * @param aTimestamp
+ * microseconds past the epoch of Jan 1, 1970
+ * @param aExtraSizeData
+ * Any extra size data optionally available with
+ * this activity
+ * @param aExtraStringData
+ * Any extra string data optionally available with
+ * this activity
+ */
+ void observeActivity(in nsISupports aHttpChannel,
+ in uint32_t aActivityType,
+ in uint32_t aActivitySubtype,
+ in PRTime aTimestamp,
+ in uint64_t aExtraSizeData,
+ in ACString aExtraStringData);
+
+ /**
+ * This attribute is true when this interface is active and should
+ * observe http activities. When false, observeActivity() should not
+ * be called. It is present for compatibility reasons and should be
+ * implemented only by nsHttpActivityDistributor.
+ */
+ readonly attribute boolean isActive;
+
+ const unsigned long ACTIVITY_TYPE_SOCKET_TRANSPORT = 0x0001;
+ const unsigned long ACTIVITY_TYPE_HTTP_TRANSACTION = 0x0002;
+
+ const unsigned long ACTIVITY_SUBTYPE_REQUEST_HEADER = 0x5001;
+ const unsigned long ACTIVITY_SUBTYPE_REQUEST_BODY_SENT = 0x5002;
+ const unsigned long ACTIVITY_SUBTYPE_RESPONSE_START = 0x5003;
+ const unsigned long ACTIVITY_SUBTYPE_RESPONSE_HEADER = 0x5004;
+ const unsigned long ACTIVITY_SUBTYPE_RESPONSE_COMPLETE = 0x5005;
+ const unsigned long ACTIVITY_SUBTYPE_TRANSACTION_CLOSE = 0x5006;
+
+ /**
+ * When aActivityType is ACTIVITY_TYPE_SOCKET_TRANSPORT
+ * and aActivitySubtype is STATUS_SENDING_TO
+ * aExtraSizeData will contain the count of bytes sent
+ * There may be more than one of these activities reported
+ * for a single http transaction, each aExtraSizeData
+ * represents only that portion of the total bytes sent
+ *
+ * When aActivityType is ACTIVITY_TYPE_HTTP_TRANSACTION
+ * and aActivitySubtype is ACTIVITY_SUBTYPE_REQUEST_HEADER
+ * aExtraStringData will contain the text of the header
+ *
+ * When aActivityType is ACTIVITY_TYPE_HTTP_TRANSACTION
+ * and aActivitySubtype is ACTIVITY_SUBTYPE_RESPONSE_HEADER
+ * aExtraStringData will contain the text of the header
+ *
+ * When aActivityType is ACTIVITY_TYPE_HTTP_TRANSACTION
+ * and aActivitySubtype is ACTIVITY_SUBTYPE_RESPONSE_COMPLETE
+ * aExtraSizeData will contain the count of total bytes received
+ */
+};
+
+%{C++
+
+#define NS_HTTP_ACTIVITY_TYPE_SOCKET_TRANSPORT \
+ nsIHttpActivityObserver::ACTIVITY_TYPE_SOCKET_TRANSPORT
+#define NS_HTTP_ACTIVITY_TYPE_HTTP_TRANSACTION \
+ nsIHttpActivityObserver::ACTIVITY_TYPE_HTTP_TRANSACTION
+
+#define NS_HTTP_ACTIVITY_SUBTYPE_REQUEST_HEADER \
+ nsIHttpActivityObserver::ACTIVITY_SUBTYPE_REQUEST_HEADER
+#define NS_HTTP_ACTIVITY_SUBTYPE_REQUEST_BODY_SENT \
+ nsIHttpActivityObserver::ACTIVITY_SUBTYPE_REQUEST_BODY_SENT
+#define NS_HTTP_ACTIVITY_SUBTYPE_RESPONSE_START \
+ nsIHttpActivityObserver::ACTIVITY_SUBTYPE_RESPONSE_START
+#define NS_HTTP_ACTIVITY_SUBTYPE_RESPONSE_HEADER \
+ nsIHttpActivityObserver::ACTIVITY_SUBTYPE_RESPONSE_HEADER
+#define NS_HTTP_ACTIVITY_SUBTYPE_RESPONSE_COMPLETE \
+ nsIHttpActivityObserver::ACTIVITY_SUBTYPE_RESPONSE_COMPLETE
+#define NS_HTTP_ACTIVITY_SUBTYPE_TRANSACTION_CLOSE \
+ nsIHttpActivityObserver::ACTIVITY_SUBTYPE_TRANSACTION_CLOSE
+
+%}
+
+/**
+ * nsIHttpActivityDistributor
+ *
+ * This interface provides a way to register and unregister observers to the
+ * http activities.
+ */
+[scriptable, uuid(7C512CB8-582A-4625-B5B6-8639755271B5)]
+interface nsIHttpActivityDistributor : nsIHttpActivityObserver
+{
+ void addObserver(in nsIHttpActivityObserver aObserver);
+ void removeObserver(in nsIHttpActivityObserver aObserver);
+};