Struct jsonrpsee::Methods

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pub struct Methods { /* private fields */ }
Expand description

Reference-counted, clone-on-write collection of synchronous and asynchronous methods.

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impl Methods

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pub fn new() -> Methods

Creates a new empty Methods.

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pub fn verify_method_name( &mut self, name: &'static str, ) -> Result<(), RegisterMethodError>

Verifies that the method name is not already taken, and returns an error if it is.

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pub fn verify_and_insert( &mut self, name: &'static str, callback: MethodCallback, ) -> Result<&mut MethodCallback, RegisterMethodError>

Inserts the method callback for a given name, or returns an error if the name was already taken. On success it returns a mut reference to the MethodCallback just inserted.

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pub fn merge( &mut self, other: impl Into<Methods>, ) -> Result<(), RegisterMethodError>

Merge two Methods’s by adding all MethodCallbacks from other into self. Fails if any of the methods in other is present already.

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pub fn method(&self, method_name: &str) -> Option<&MethodCallback>

Returns the method callback.

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pub fn method_with_name( &self, method_name: &str, ) -> Option<(&'static str, &MethodCallback)>

Returns the method callback along with its name. The returned name is same as the method_name, but its lifetime bound is 'static.

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pub async fn call<Params, T>( &self, method: &str, params: Params, ) -> Result<T, MethodsError>
where Params: ToRpcParams, T: DeserializeOwned + Clone,

Helper to call a method on the RPC module without having to spin up a server.

The params must be serializable as JSON array, see ToRpcParams for further documentation.

Returns the decoded value of the result field in JSON-RPC response if successful.

§Examples
#[tokio::main]
async fn main() {
    use jsonrpsee::{RpcModule, IntoResponse};
    use jsonrpsee::core::RpcResult;

    let mut module = RpcModule::new(());
    module.register_method::<RpcResult<u64>, _>("echo_call", |params, _, _| {
        params.one::<u64>().map_err(Into::into)
    }).unwrap();

    let echo: u64 = module.call("echo_call", [1_u64]).await.unwrap();
    assert_eq!(echo, 1);
}
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pub async fn raw_json_request( &self, request: &str, buf_size: usize, ) -> Result<(String, Receiver<String>), Error>

Make a request (JSON-RPC method call or subscription) by using raw JSON.

Returns the raw JSON response to the call and a stream to receive notifications if the call was a subscription.

§Examples
#[tokio::main]
async fn main() {
    use jsonrpsee::{RpcModule, SubscriptionMessage};
    use jsonrpsee::types::{response::Success, Response};
    use futures_util::StreamExt;

    let mut module = RpcModule::new(());
    module.register_subscription("hi", "hi", "goodbye", |_, pending, _, _| async {
        let sink = pending.accept().await?;

        // see comment above.
        sink.send("one answer".into()).await?;

        Ok(())
    }).unwrap();
    let (resp, mut stream) = module.raw_json_request(r#"{"jsonrpc":"2.0","method":"hi","id":0}"#, 1).await.unwrap();
    // If the response is an error converting it to `Success` will fail.
    let resp: Success<u64> = serde_json::from_str::<Response<u64>>(&resp).unwrap().try_into().unwrap();
    let sub_resp = stream.recv().await.unwrap();
    assert_eq!(
        format!(r#"{{"jsonrpc":"2.0","method":"hi","params":{{"subscription":{},"result":"one answer"}}}}"#, resp.result),
        sub_resp
    );
}
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pub async fn subscribe_unbounded( &self, sub_method: &str, params: impl ToRpcParams, ) -> Result<Subscription, MethodsError>

Helper to create a subscription on the RPC module without having to spin up a server.

The params must be serializable as JSON array, see ToRpcParams for further documentation.

Returns Subscription on success which can used to get results from the subscription.

§Examples
#[tokio::main]
async fn main() {
    use jsonrpsee::{RpcModule, SubscriptionMessage};
    use jsonrpsee::core::{EmptyServerParams, RpcResult};

    let mut module = RpcModule::new(());
    module.register_subscription("hi", "hi", "goodbye", |_, pending, _, _| async move {
        let sink = pending.accept().await?;
        sink.send("one answer".into()).await?;
        Ok(())
    }).unwrap();

    let mut sub = module.subscribe_unbounded("hi", EmptyServerParams::new()).await.unwrap();
    // In this case we ignore the subscription ID,
    let (sub_resp, _sub_id) = sub.next::<String>().await.unwrap().unwrap();
    assert_eq!(&sub_resp, "one answer");
}
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pub async fn subscribe( &self, sub_method: &str, params: impl ToRpcParams, buf_size: usize, ) -> Result<Subscription, MethodsError>

Similar to Methods::subscribe_unbounded but it’s using a bounded channel and the buffer capacity must be provided.

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pub fn method_names(&self) -> impl Iterator<Item = &'static str>

Returns an Iterator with all the method names registered on this server.

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pub fn extensions(&mut self) -> &Extensions

Similar to Methods::extensions_mut but it’s immutable.

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pub fn extensions_mut(&mut self) -> &mut Extensions

Get a mutable reference to the extensions to add or remove data from the extensions.

This only affects direct calls to the methods and subscriptions and can be used for example to unit test the API without a server.

§Examples
#[tokio::main]
async fn main() {
    use jsonrpsee::{RpcModule, IntoResponse, Extensions};
    use jsonrpsee::core::RpcResult;

    let mut module = RpcModule::new(());
    module.register_method::<RpcResult<u64>, _>("magic_multiply", |params, _, ext| {
        let magic = ext.get::<u64>().copied().unwrap();
        let val = params.one::<u64>()?;
        Ok(val * magic)
    }).unwrap();

    // inject arbitrary data into the extensions.
    module.extensions_mut().insert(33_u64);

    let magic: u64 = module.call("magic_multiply", [1_u64]).await.unwrap();
    assert_eq!(magic, 33);
}

Trait Implementations§

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impl Clone for Methods

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fn clone(&self) -> Methods

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 Methods

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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 Methods

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fn default() -> Methods

Returns the “default value” for a type. Read more
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impl<Context> From<RpcModule<Context>> for Methods

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fn from(module: RpcModule<Context>) -> Methods

Converts to this type from the input type.

Auto Trait Implementations§

Blanket 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> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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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Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> MaybeSend for T
where T: Send,