Struct retina::client::SessionGroup [−][src]
pub struct SessionGroup(_);
Expand description
A grouping of sessions, currently used only to track stale sessions.
Sessions are associated with a group via SessionOptions::session_group
.
This is an experimental API which may change in an upcoming Retina version.
Stale sessions are ones which are no longer active on the client side
(no Session
struct exists) but may still be in state Ready
, Playing
,
or Recording
on the server. The client has neither seen a TEARDOWN
response nor believes they have reached their expiration time. They are
tracked in two cases:
- Dropped
Session
s if theTeardownPolicy
says to do so and a validSETUP
response has been received. - TCP sessions discovered via unexpected RTSP interleaved data packets. These are assumed to be due to a live555 bug in which data continues to be sent on a stale file descriptor after a connection is closed. They may have been started by a process unknown to us and their session id is unknown.
Currently a single TEARDOWN
will be attempted in the background after
a Session
is dropped. SessionGroup::await_teardown
can be used to wait
for it to conclude.
Stale sessions are forgotten either on teardown or expiration. In general, the tracked expiration time is worst-case. The exception is if the sender hasn’t responded to a keepalive request. In that case there’s theoretically no bound on when the server could see the request and extend the session. Retina ignores this possibility.
A SessionGroup can be of any granularity, but a typical use is to ensure there are no stale sessions before starting a fresh session. Groups should be sized to match that idea. If connecting to a live555 server affected by the stale TCP session bug, it might be wise to have one group per server, so that all such sessions can be drained before initiating new connections. Otherwise it might be useful to have one group per describe URL (potentially several per server) and have at most one active session per URL.
Implementations
Returns the status of stale sessions in this group.
Currently this only returns information about sessions which may be in
state Playing
. That is, Retina has sent a PLAY
request, regardless
of whether it has received a response.
The caller might use this in a loop to sleep until there are no such sessions.
Waits for a TEARDOWN
to be attempted on all stale sessions that exist
as of when this method is called, returning an error if any fail.
This has no timeout other than the sessions’ expiration times. The
caller can wrap the call in tokio::time::timeout
for an earlier time.
Currently on Session::drop
, a TEARDOWN
is started in the background.
This method waits for that to conclude. It doesn’t attempt any new
TEARDOWN
requests, even if called repeatedly. This may change.
Ignores the discovered sessions, as it’s impossible to send a TEARDOWN
without knowing the session id. If desired, the caller can learn of the
existence of the sessions through SessionGroup::stale_sessions
and
sleep until they expire.
Trait Implementations
Returns the “default value” for a type. Read more
Auto Trait Implementations
impl RefUnwindSafe for SessionGroup
impl Send for SessionGroup
impl Sync for SessionGroup
impl Unpin for SessionGroup
impl UnwindSafe for SessionGroup
Blanket Implementations
Mutably borrows from an owned value. Read more
fn fmt_binary(self) -> FmtBinary<Self> where
Self: Binary,
fn fmt_binary(self) -> FmtBinary<Self> where
Self: Binary,
Causes self
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-formatted.
fn fmt_display(self) -> FmtDisplay<Self> where
Self: Display,
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Self: Display,
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Self: LowerExp,
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Self: LowerExp,
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fn fmt_lower_hex(self) -> FmtLowerHex<Self> where
Self: LowerHex,
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Self: LowerHex,
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Causes self
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fn fmt_pointer(self) -> FmtPointer<Self> where
Self: Pointer,
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Self: UpperExp,
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Self: UpperExp,
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Self: UpperHex,
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Self: UpperHex,
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func: impl FnOnce(&'a mut B) -> R
) -> R where
Self: BorrowMut<B>,
B: 'a + ?Sized,
R: 'a,
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&'a mut self,
func: impl FnOnce(&'a mut B) -> R
) -> R where
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B: 'a + ?Sized,
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fn pipe_as_ref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> R where
Self: AsRef<T>,
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Self: AsMut<T>,
T: 'a,
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Self: AsMut<T>,
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) -> R where
Self: BorrowMut<T>,
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&'a mut self,
func: impl FnOnce(&'a mut T) -> R
) -> R where
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) -> R where
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F: FnOnce(&mut T) -> R,
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Self: Borrow<T>,
F: FnOnce(&T) -> R,
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F: FnOnce(&T) -> R,
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F: FnOnce(&T) -> R,
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Self: Borrow<T>,
F: FnOnce(&T) -> R,
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Self: BorrowMut<T>,
F: FnOnce(&mut T) -> R,
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F: FnOnce(&mut T) -> R,
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Immutably dereferences self
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Self: Deref,
F: FnOnce(&Self::Target) -> R,
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F: FnOnce(&Self::Target) -> R,
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fn tap_deref_mut<F, R>(self, func: F) -> Self where
Self: DerefMut,
F: FnOnce(&mut Self::Target) -> R,
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Self: DerefMut,
F: FnOnce(&mut Self::Target) -> R,
Mutably dereferences self
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Self: DerefMut,
F: FnOnce(&mut Self::Target) -> R,
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F: FnOnce(&mut Self::Target) -> R,
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