pub enum Version {
    V1,
    V1Lazy,
}
Expand description

Supported multistream-select versions.

Variants§

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V1

Version 1 of the multistream-select protocol. See 1 and 2.

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V1Lazy

A “lazy” variant of version 1 that is identical on the wire but whereby the dialer delays flushing protocol negotiation data in order to combine it with initial application data, thus performing 0-RTT negotiation.

This strategy is only applicable for the node with the role of “dialer” in the negotiation and only if the dialer supports just a single application protocol. In that case the dialer immedidately “settles” on that protocol, buffering the negotiation messages to be sent with the first round of application protocol data (or an attempt is made to read from the Negotiated I/O stream).

A listener will behave identically to V1. This ensures interoperability with V1. Notably, it will immediately send the multistream header as well as the protocol confirmation, resulting in multiple frames being sent on the underlying transport. Nevertheless, if the listener supports the protocol that the dialer optimistically settled on, it can be a 0-RTT negotiation.

Note: V1Lazy is specific to rust-libp2p. The wire protocol is identical to V1 and generally interoperable with peers only supporting V1. Nevertheless, there is a pitfall that is rarely encountered: When nesting multiple protocol negotiations, the listener should either be known to support all of the dialer’s optimistically chosen protocols or there is must be no intermediate protocol without a payload and none of the protocol payloads must have the potential for being mistaken for a multistream-select protocol message. This avoids rare edge-cases whereby the listener may not recognize upgrade boundaries and erroneously process a request despite not supporting one of the intermediate protocols that the dialer committed to. See 1 and 2.

Trait Implementations§

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impl Clone for Version

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fn clone(&self) -> Version

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Version

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Default for Version

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fn default() -> Version

Returns the “default value” for a type. Read more
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impl PartialEq for Version

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fn eq(&self, other: &Version) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for Version

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impl Eq for Version

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impl StructuralEq for Version

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impl StructuralPartialEq for Version

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more