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The current code causes one mDNS service to be created for each PeerConnection. Due to Bug 1569311, the services persist until shutdown, which can lead to a lot of mDNS threads running on sites which use WebRTC for fingerprinting. This change makes it so we start at most one mDNS service. I've filed Bug 1569955 to look at shutting down the mDNS service after the last hostname is unregistered. As an alternative, if we fix Bug 1569311, we could also use refcounting and stop the mDNS service after the last StunAddrsRequestParent is freed. Differential Revision: https://phabricator.services.mozilla.com/D42151 --HG-- extra : moz-landing-system : lando |
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.. | ||
build | ||
fuzztest | ||
ipc | ||
mdns_service | ||
test | ||
third_party | ||
common.build | ||
dtlsidentity.cpp | ||
dtlsidentity.h | ||
logging.h | ||
m_cpp_utils.h | ||
mediapacket.cpp | ||
mediapacket.h | ||
moz.build | ||
nr_socket_proxy_config.cpp | ||
nr_socket_proxy_config.h | ||
nr_socket_proxy.cpp | ||
nr_socket_proxy.h | ||
nr_socket_prsock.cpp | ||
nr_socket_prsock.h | ||
nr_timer.cpp | ||
nricectx.cpp | ||
nricectx.h | ||
nricemediastream.cpp | ||
nricemediastream.h | ||
nriceresolver.cpp | ||
nriceresolver.h | ||
nriceresolverfake.cpp | ||
nriceresolverfake.h | ||
nricestunaddr.cpp | ||
nricestunaddr.h | ||
nrinterfaceprioritizer.cpp | ||
nrinterfaceprioritizer.h | ||
README | ||
rlogconnector.cpp | ||
rlogconnector.h | ||
runnable_utils.h | ||
sigslot.h | ||
simpletokenbucket.cpp | ||
simpletokenbucket.h | ||
SrtpFlow.cpp | ||
SrtpFlow.h | ||
stun_socket_filter.cpp | ||
stun_socket_filter.h | ||
test_nr_socket.cpp | ||
test_nr_socket.h | ||
transportflow.cpp | ||
transportflow.h | ||
transportlayer.cpp | ||
transportlayer.h | ||
transportlayerdtls.cpp | ||
transportlayerdtls.h | ||
transportlayerice.cpp | ||
transportlayerice.h | ||
transportlayerlog.cpp | ||
transportlayerlog.h | ||
transportlayerloopback.cpp | ||
transportlayerloopback.h | ||
transportlayersrtp.cpp | ||
transportlayersrtp.h | ||
WebrtcProxyChannelWrapper.cpp | ||
WebrtcProxyChannelWrapper.h |
This is a generic media transport system for WebRTC. The basic model is that you have a TransportFlow which contains a series of TransportLayers, each of which gets an opportunity to manipulate data up and down the stack (think SysV STREAMS or a standard networking stack). You can also address individual sublayers to manipulate them or to bypass reading and writing at an upper layer; WebRTC uses this to implement DTLS-SRTP. DATAFLOW MODEL Unlike the existing nsSocket I/O system, this is a push rather than a pull system. Clients of the interface do writes downward with SendPacket() and receive notification of incoming packets via callbacks registed via sigslot.h. It is the responsibility of the bottom layer (or any other layer which needs to reference external events) to arrange for that somehow; typically by using nsITimer or the SocketTansportService. This sort of push model is a much better fit for the demands of WebRTC, expecially because ICE contexts span multiple network transports. THREADING MODEL There are no thread locks. It is the responsibility of the caller to arrange that any given TransportLayer/TransportFlow is only manipulated in one thread at once. One good way to do this is to run everything on the STS thread. Many of the existing layer implementations (TransportLayerIce, TransportLayerLoopback) already run on STS so in those cases you must run on STS, though you can do setup on the main thread and then activate them on the STS. EXISTING TRANSPORT LAYERS The following transport layers are currently implemented: * DTLS -- a wrapper around NSS's DTLS [RFC 6347] stack * ICE -- a wrapper around the nICEr ICE [RFC 5245] stack. * Loopback -- a loopback IO mechanism * Logging -- a passthrough that just logs its data The last two are primarily for debugging.