[−][src]Struct libp2p::wasm_ext::ffi::Connection
Type of the object that represents an open connection with a remote.
Methods
impl Connection
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impl Connection
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pub fn write(&self, data: &[u8]) -> Result<Promise, JsValue>
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Writes data to the connection. Returns a Promise
that resolves when the connection is
ready for writing again.
If the Promise
returns an error, the writing side of the connection is considered
unrecoverable and the connection should be closed as soon as possible.
Guaranteed to only be called after the previous write promise has resolved.
impl Connection
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pub fn shutdown(&self) -> Result<(), JsValue>
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Shuts down the writing side of the connection. After this has been called, the write
method will no longer be called.
impl Connection
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pub fn close(&self)
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Closes the connection. No other method will be called on this connection anymore.
Methods from Deref<Target = JsValue>
pub const NULL: JsValue
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pub const UNDEFINED: JsValue
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pub const TRUE: JsValue
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pub const FALSE: JsValue
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pub fn as_f64(&self) -> Option<f64>
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Returns the f64
value of this JS value if it's an instance of a
number.
If this JS value is not an instance of a number then this returns
None
.
pub fn is_string(&self) -> bool
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Tests whether this JS value is a JS string.
pub fn as_string(&self) -> Option<String>
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If this JS value is a string value, this function copies the JS string
value into wasm linear memory, encoded as UTF-8, and returns it as a
Rust String
.
To avoid the copying and re-encoding, consider the
JsString::try_from()
function from js-sys
instead.
If this JS value is not an instance of a string or if it's not valid
utf-8 then this returns None
.
UTF-16 vs UTF-8
JavaScript strings in general are encoded as UTF-16, but Rust strings
are encoded as UTF-8. This can cause the Rust string to look a bit
different than the JS string sometimes. For more details see the
documentation about the str
type which contains a few
caveats about the encodings.
pub fn as_bool(&self) -> Option<bool>
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Returns the bool
value of this JS value if it's an instance of a
boolean.
If this JS value is not an instance of a boolean then this returns
None
.
pub fn is_null(&self) -> bool
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Tests whether this JS value is null
pub fn is_undefined(&self) -> bool
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Tests whether this JS value is undefined
pub fn is_symbol(&self) -> bool
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Tests whether the type of this JS value is symbol
pub fn is_object(&self) -> bool
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Tests whether typeof self == "object" && self !== null
.
pub fn is_function(&self) -> bool
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Tests whether the type of this JS value is function
.
Trait Implementations
impl AsRef<JsValue> for Connection
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impl AsRef<Connection> for Connection
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fn as_ref(&self) -> &Connection
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impl OptionFromWasmAbi for Connection
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fn is_none(abi: &<Connection as FromWasmAbi>::Abi) -> bool
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impl RefFromWasmAbi for Connection
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type Abi = <JsValue as RefFromWasmAbi>::Abi
The wasm ABI type references to Self
are recovered from.
type Anchor = ManuallyDrop<Connection>
The type that holds the reference to Self
for the duration of the invocation of the function that has an &Self
parameter. This is required to ensure that the lifetimes don't persist beyond one function call, and so that they remain anonymous. Read more
unsafe fn ref_from_abi(
js: <Connection as RefFromWasmAbi>::Abi,
extra: &mut dyn Stack
) -> <Connection as RefFromWasmAbi>::Anchor
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js: <Connection as RefFromWasmAbi>::Abi,
extra: &mut dyn Stack
) -> <Connection as RefFromWasmAbi>::Anchor
impl<'a> OptionIntoWasmAbi for &'a Connection
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fn none() -> <&'a Connection as IntoWasmAbi>::Abi
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impl OptionIntoWasmAbi for Connection
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fn none() -> <Connection as IntoWasmAbi>::Abi
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impl FromWasmAbi for Connection
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type Abi = <JsValue as FromWasmAbi>::Abi
The wasm ABI type that this converts from when coming back out from the ABI boundary. Read more
unsafe fn from_abi(
js: <Connection as FromWasmAbi>::Abi,
extra: &mut dyn Stack
) -> Connection
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js: <Connection as FromWasmAbi>::Abi,
extra: &mut dyn Stack
) -> Connection
impl JsCast for Connection
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fn instanceof(val: &JsValue) -> bool
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fn unchecked_from_js(val: JsValue) -> Connection
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fn unchecked_from_js_ref(val: &JsValue) -> &Connection
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fn has_type<T>(&self) -> bool where
T: JsCast,
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T: JsCast,
Test whether this JS value has a type T
. Read more
fn dyn_into<T>(self) -> Result<T, Self> where
T: JsCast,
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T: JsCast,
Performs a dynamic cast (checked at runtime) of this value into the target type T
. Read more
fn dyn_ref<T>(&self) -> Option<&T> where
T: JsCast,
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T: JsCast,
Performs a dynamic cast (checked at runtime) of this value into the target type T
. Read more
fn unchecked_into<T>(self) -> T where
T: JsCast,
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T: JsCast,
Performs a zero-cost unchecked cast into the specified type. Read more
fn unchecked_ref<T>(&self) -> &T where
T: JsCast,
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T: JsCast,
Performs a zero-cost unchecked cast into a reference to the specified type. Read more
fn is_instance_of<T>(&self) -> bool where
T: JsCast,
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T: JsCast,
Test whether this JS value is an instance of the type T
. Read more
fn is_type_of(val: &JsValue) -> bool
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Performs a dynamic check to see whether the JsValue
provided is a value of this type. Read more
impl<'a> IntoWasmAbi for &'a Connection
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type Abi = <&'a JsValue as IntoWasmAbi>::Abi
The wasm ABI type that this converts into when crossing the ABI boundary. Read more
fn into_abi(self, extra: &mut dyn Stack) -> <&'a Connection as IntoWasmAbi>::Abi
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impl IntoWasmAbi for Connection
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type Abi = <JsValue as IntoWasmAbi>::Abi
The wasm ABI type that this converts into when crossing the ABI boundary. Read more
fn into_abi(self, extra: &mut dyn Stack) -> <Connection as IntoWasmAbi>::Abi
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impl Deref for Connection
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impl From<Connection> for JsValue
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fn from(obj: Connection) -> JsValue
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impl From<JsValue> for Connection
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fn from(obj: JsValue) -> Connection
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Auto Trait Implementations
impl !Send for Connection
impl !Sync for Connection
Blanket Implementations
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Same<T> for T
type Output = T
Should always be Self
impl<T> Erased for T
impl<T> Erased for T
impl<T> ReturnWasmAbi for T where
T: IntoWasmAbi,
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T: IntoWasmAbi,
type Abi = <T as IntoWasmAbi>::Abi
Same as IntoWasmAbi::Abi