Newer
Older
// Copyright 2019-2021 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any
// person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the
// Software without restriction, including without
// limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice
// shall be included in all copies or substantial portions
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
use crate::server::resource_limiting::{ResourceGuard, ResourceTable, ResourceVec, Resources};
use futures_channel::{mpsc, oneshot};
use futures_util::{future::BoxFuture, FutureExt, StreamExt};
use jsonrpsee_types::to_json_raw_value;
use jsonrpsee_types::v2::error::{invalid_subscription_err, CALL_EXECUTION_FAILED_CODE};
error::{Error, SubscriptionClosedError},
ErrorCode, Id, Params, Request, Response, SubscriptionId as RpcSubscriptionId, SubscriptionPayload,
use parking_lot::Mutex;
use rustc_hash::FxHashMap;
use serde::Serialize;
/// A `MethodCallback` is an RPC endpoint, callable with a standard JSON-RPC request,
/// implemented as a function pointer to a `Fn` function taking four arguments:
/// the `id`, `params`, a channel the function uses to communicate the result (or error)
/// back to `jsonrpsee`, and the connection ID (useful for the websocket transport).
pub type SyncMethod = Arc<dyn Send + Sync + Fn(Id, Params, &MethodSink, ConnectionId) -> bool>;
/// Similar to [`SyncMethod`], but represents an asynchronous handler and takes an additional argument containing a [`ResourceGuard`] if configured.
pub type AsyncMethod<'a> =
Arc<dyn Send + Sync + Fn(Id<'a>, Params<'a>, MethodSink, Option<ResourceGuard>) -> BoxFuture<'a, bool>>;
/// Connection ID, used for stateful protocol such as WebSockets.
/// For stateless protocols such as http it's unused, so feel free to set it some hardcoded value.
pub type ConnectionId = usize;
/// Subscription ID.
pub type SubscriptionId = u64;
/// Raw RPC response.
pub type RawRpcResponse = (String, mpsc::UnboundedReceiver<String>, mpsc::UnboundedSender<String>);
type Subscribers = Arc<Mutex<FxHashMap<SubscriptionKey, (MethodSink, oneshot::Receiver<()>)>>>;
/// Represent a unique subscription entry based on [`SubscriptionId`] and [`ConnectionId`].
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
struct SubscriptionKey {
conn_id: ConnectionId,
sub_id: SubscriptionId,
}
/// Callback wrapper that can be either sync or async.
/// Information about resources the method uses during its execution. Initialized when the the server starts.
#[derive(Clone, Debug)]
enum MethodResources {
/// Uninitialized resource table, mapping string label to units.
Uninitialized(Box<[(&'static str, u16)]>),
/// Initialized resource table containing units for each `ResourceId`.
Initialized(ResourceTable),
}
/// Method callback wrapper that contains a sync or async closure,
/// plus a table with resources it needs to claim to run
#[derive(Clone, Debug)]
pub struct MethodCallback {
callback: MethodKind,
resources: MethodResources,
}
/// Result of a method, either direct value or a future of one.
pub enum MethodResult<T> {
/// Result by value
Sync(T),
/// Future of a value
Async(BoxFuture<'static, T>),
}
impl<T: Debug> Debug for MethodResult<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
MethodResult::Sync(result) => result.fmt(f),
MethodResult::Async(_) => f.write_str("<future>"),
}
}
}
/// Builder for configuring resources used by a method.
#[derive(Debug)]
pub struct MethodResourcesBuilder<'a> {
build: ResourceVec<(&'static str, u16)>,
callback: &'a mut MethodCallback,
}
impl<'a> MethodResourcesBuilder<'a> {
/// Define how many units of a given named resource the method uses during its execution.
pub fn resource(mut self, label: &'static str, units: u16) -> Result<Self, Error> {
self.build.try_push((label, units)).map_err(|_| Error::MaxResourcesReached)?;
Ok(self)
}
}
impl<'a> Drop for MethodResourcesBuilder<'a> {
fn drop(&mut self) {
self.callback.resources = MethodResources::Uninitialized(self.build[..].into());
}
}
fn new_sync(callback: SyncMethod) -> Self {
MethodCallback { callback: MethodKind::Sync(callback), resources: MethodResources::Uninitialized([].into()) }
}
fn new_async(callback: AsyncMethod<'static>) -> Self {
MethodCallback { callback: MethodKind::Async(callback), resources: MethodResources::Uninitialized([].into()) }
}
/// Attempt to claim resources prior to executing a method. On success returns a guard that releases
/// claimed resources when dropped.
pub fn claim(&self, name: &str, resources: &Resources) -> Result<ResourceGuard, Error> {
match self.resources {
MethodResources::Uninitialized(_) => Err(Error::UninitializedMethod(name.into())),
MethodResources::Initialized(units) => resources.claim(units),
}
}
/// Execute the callback, sending the resulting JSON (success or error) to the specified sink.
req: Request<'_>,
conn_id: ConnectionId,
claimed: Option<ResourceGuard>,
let params = Params::new(req.params.map(|params| params.get()));
"[MethodCallback::execute] Executing sync callback, params={:?}, req.id={:?}, conn_id={:?}",
params,
id,
conn_id
);
let result = (callback)(id, params, sink, conn_id);
// Release claimed resources
drop(claimed);
"[MethodCallback::execute] Executing async callback, params={:?}, req.id={:?}, conn_id={:?}",
params,
id,
conn_id
);
MethodResult::Async((callback)(id, params, sink, claimed))
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Async(_) => write!(f, "Async"),
Self::Sync(_) => write!(f, "Sync"),
}
}
}
/// Reference-counted, clone-on-write collection of synchronous and asynchronous methods.
#[derive(Default, Debug, Clone)]
callbacks: Arc<FxHashMap<&'static str, MethodCallback>>,
impl Methods {
/// Creates a new empty [`Methods`].
pub fn new() -> Self {
Self::default()
fn verify_method_name(&mut self, name: &'static str) -> Result<(), Error> {
if self.callbacks.contains_key(name) {
return Err(Error::MethodAlreadyRegistered(name.into()));
}
Ok(())
}
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/// 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.
fn verify_and_insert(
&mut self,
name: &'static str,
callback: MethodCallback,
) -> Result<&mut MethodCallback, Error> {
match self.mut_callbacks().entry(name) {
Entry::Occupied(_) => Err(Error::MethodAlreadyRegistered(name.into())),
Entry::Vacant(vacant) => Ok(vacant.insert(callback)),
}
}
/// Initialize resources for all methods in this collection. This method has no effect if called more than once.
pub fn initialize_resources(mut self, resources: &Resources) -> Result<Self, Error> {
let callbacks = self.mut_callbacks();
for (&method_name, callback) in callbacks.iter_mut() {
if let MethodResources::Uninitialized(uninit) = &callback.resources {
let mut map = resources.defaults;
for &(label, units) in uninit.iter() {
let idx = match resources.labels.iter().position(|&l| l == label) {
Some(idx) => idx,
None => return Err(Error::ResourceNameNotFoundForMethod(label, method_name)),
};
// If resource capacity set to `0`, we ignore the unit value of the method
// and set it to `0` as well, effectively making the resource unlimited.
if resources.capacities[idx] == 0 {
map[idx] = 0;
} else {
map[idx] = units;
}
}
callback.resources = MethodResources::Initialized(map);
}
}
Ok(self)
}
/// Helper for obtaining a mut ref to the callbacks HashMap.
fn mut_callbacks(&mut self) -> &mut FxHashMap<&'static str, MethodCallback> {
Arc::make_mut(&mut self.callbacks)
}
/// Merge two [`Methods`]'s by adding all [`MethodCallback`]s from `other` into `self`.
/// Fails if any of the methods in `other` is present already.
pub fn merge(&mut self, other: impl Into<Methods>) -> Result<(), Error> {
let mut other = other.into();
self.verify_method_name(name)?;
}
let callbacks = self.mut_callbacks();
for (name, callback) in other.mut_callbacks().drain() {
callbacks.insert(name, callback);
/// Returns the method callback.
pub fn method(&self, method_name: &str) -> Option<&MethodCallback> {
self.callbacks.get(method_name)
/// Returns the method callback along with its name. The returned name is same as the
/// `method_name`, but its lifetime bound is `'static`.
pub fn method_with_name(&self, method_name: &str) -> Option<(&'static str, &MethodCallback)> {
self.callbacks.get_key_value(method_name).map(|(k, v)| (*k, v))
}
/// Attempt to execute a callback, sending the resulting JSON (success or error) to the specified sink.
pub fn execute(&self, sink: &MethodSink, req: Request, conn_id: ConnectionId) -> MethodResult<bool> {
tracing::trace!("[Methods::execute] Executing request: {:?}", req);
match self.callbacks.get(&*req.method) {
Some(callback) => callback.execute(sink, req, conn_id, None),
sink.send_error(req.id, ErrorCode::MethodNotFound.into());
MethodResult::Sync(false)
/// Attempt to execute a callback while checking that the call does not exhaust the available resources,
// sending the resulting JSON (success or error) to the specified sink.
pub fn execute_with_resources<'r>(
conn_id: ConnectionId,
resources: &Resources,
) -> Result<(&'static str, MethodResult<bool>), Cow<'r, str>> {
tracing::trace!("[Methods::execute_with_resources] Executing request: {:?}", req);
match self.callbacks.get_key_value(&*req.method) {
Some((&name, callback)) => match callback.claim(&req.method, resources) {
Ok(guard) => Ok((name, callback.execute(sink, req, conn_id, Some(guard)))),
tracing::error!("[Methods::execute_with_resources] failed to lock resources: {:?}", err);
sink.send_error(req.id, ErrorCode::ServerIsBusy.into());
Ok((name, MethodResult::Sync(false)))
sink.send_error(req.id, ErrorCode::MethodNotFound.into());
Err(req.method)
/// Helper to call a method on the `RPC module` without having to spin up a server.
Niklas Adolfsson
committed
///
/// The params must be serializable as JSON array, see [`ToRpcParams`] for further documentation.
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
///
/// Returns the decoded value of the `result field` in JSON-RPC response if succesful.
///
/// # Examples
///
/// ```
/// #[tokio::main]
/// async fn main() {
/// use jsonrpsee::RpcModule;
///
/// let mut module = RpcModule::new(());
/// module.register_method("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);
/// }
/// ```
pub async fn call<Params: ToRpcParams, T: DeserializeOwned>(
&self,
method: &str,
params: Params,
) -> Result<T, Error> {
let params = params.to_rpc_params()?;
let req = Request::new(method.into(), Some(¶ms), Id::Number(0));
tracing::trace!("[Methods::call] Calling method: {:?}, params: {:?}", method, params);
let (resp, _, _) = self.inner_call(req).await;
if let Ok(res) = serde_json::from_str::<Response<T>>(&resp) {
return Ok(res.result);
Err(Error::Request(resp))
/// 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, types::v2::Response};
/// use futures_util::StreamExt;
///
/// let mut module = RpcModule::new(());
/// module.register_subscription("hi", "hi", "goodbye", |_, mut sink, _| {
/// sink.send(&"one answer").unwrap();
/// Ok(())
/// }).unwrap();
/// let (resp, mut stream) = module.raw_json_request(r#"{"jsonrpc":"2.0","method":"hi","id":0}"#).await.unwrap();
/// let resp = serde_json::from_str::<Response<u64>>(&resp).unwrap();
/// let sub_resp = stream.next().await.unwrap();
/// assert_eq!(
/// format!(r#"{{"jsonrpc":"2.0","method":"hi","params":{{"subscription":{},"result":"one answer"}}}}"#, resp.result),
/// sub_resp
/// );
pub async fn raw_json_request(&self, call: &str) -> Result<(String, mpsc::UnboundedReceiver<String>), Error> {
tracing::trace!("[Methods::raw_json_request] {:?}", call);
let req: Request = serde_json::from_str(call)?;
let (resp, rx, _) = self.inner_call(req).await;
Ok((resp, rx))
/// Wrapper over [`Methods::execute`] to execute a callback.
async fn inner_call(&self, req: Request<'_>) -> RawRpcResponse {
if let MethodResult::Async(fut) = self.execute(&sink, req, 0) {
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
let resp = rx.next().await.expect("tx and rx still alive; qed");
(resp, rx, tx)
}
/// 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 succes which can used to get results from the subscriptions.
///
/// # Examples
///
/// ```
/// #[tokio::main]
/// async fn main() {
/// use jsonrpsee::{RpcModule, types::EmptyParams};
///
/// let mut module = RpcModule::new(());
/// module.register_subscription("hi", "hi", "goodbye", |_, mut sink, _| {
/// sink.send(&"one answer").unwrap();
/// Ok(())
/// }).unwrap();
///
/// let mut sub = module.subscribe("hi", EmptyParams::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");
/// }
/// ```
pub async fn subscribe(&self, sub_method: &str, params: impl ToRpcParams) -> Result<Subscription, Error> {
let params = params.to_rpc_params()?;
let req = Request::new(sub_method.into(), Some(¶ms), Id::Number(0));
tracing::trace!("[Methods::subscribe] Calling subscription method: {:?}, params: {:?}", sub_method, params);
let (response, rx, tx) = self.inner_call(req).await;
let subscription_response = serde_json::from_str::<Response<SubscriptionId>>(&response)?;
let sub_id = subscription_response.result;
Ok(Subscription { sub_id, rx, tx })
/// Returns an `Iterator` with all the method names registered on this server.
pub fn method_names(&self) -> impl Iterator<Item = &'static str> + '_ {
self.callbacks.keys().copied()
}
}
impl<Context> Deref for RpcModule<Context> {
type Target = Methods;
fn deref(&self) -> &Methods {
&self.methods
}
}
impl<Context> DerefMut for RpcModule<Context> {
fn deref_mut(&mut self) -> &mut Methods {
&mut self.methods
}
}
/// Sets of JSON-RPC methods can be organized into a "module"s that are in turn registered on the server or,
/// alternatively, merged with other modules to construct a cohesive API. [`RpcModule`] wraps an additional context
/// argument that can be used to access data during call execution.
pub struct RpcModule<Context> {
ctx: Arc<Context>,
impl<Context> RpcModule<Context> {
/// Create a new module with a given shared `Context`.
pub fn new(ctx: Context) -> Self {
Self { ctx: Arc::new(ctx), methods: Default::default() }
impl<Context> From<RpcModule<Context>> for Methods {
fn from(module: RpcModule<Context>) -> Methods {
module.methods
}
}
impl<Context: Send + Sync + 'static> RpcModule<Context> {
/// Register a new synchronous RPC method, which computes the response with the given callback.
pub fn register_method<R, F>(
&mut self,
method_name: &'static str,
callback: F,
) -> Result<MethodResourcesBuilder, Error>
F: Fn(Params, &Context) -> Result<R, Error> + Send + Sync + 'static,
MethodCallback::new_sync(Arc::new(move |id, params, sink, _| match callback(params, &*ctx) {
Ok(res) => sink.send_response(id, res),
Err(err) => sink.send_call_error(id, err),
Ok(MethodResourcesBuilder { build: ResourceVec::new(), callback })
/// Register a new asynchronous RPC method, which computes the response with the given callback.
pub fn register_async_method<R, Fun, Fut>(
&mut self,
method_name: &'static str,
callback: Fun,
) -> Result<MethodResourcesBuilder, Error>
where
R: Serialize + Send + Sync + 'static,
Fut: Future<Output = Result<R, Error>> + Send,
Fun: (Fn(Params<'static>, Arc<Context>) -> Fut) + Copy + Send + Sync + 'static,
{
let ctx = self.ctx.clone();
MethodCallback::new_async(Arc::new(move |id, params, sink, claimed| {
let ctx = ctx.clone();
let future = async move {
let result = match callback(params, ctx).await {
Ok(res) => sink.send_response(id, res),
Err(err) => sink.send_call_error(id, err),
// Release claimed resources
drop(claimed);
Ok(MethodResourcesBuilder { build: ResourceVec::new(), callback })
/// Register a new **blocking** synchronous RPC method, which computes the response with the given callback.
/// Unlike the regular [`register_method`](RpcModule::register_method), this method can block its thread and perform expensive computations.
pub fn register_blocking_method<R, F>(
&mut self,
method_name: &'static str,
callback: F,
) -> Result<MethodResourcesBuilder, Error>
where
Context: Send + Sync + 'static,
R: Serialize,
F: Fn(Params, Arc<Context>) -> Result<R, Error> + Copy + Send + Sync + 'static,
{
let ctx = self.ctx.clone();
let callback = self.methods.verify_and_insert(
method_name,
MethodCallback::new_async(Arc::new(move |id, params, sink, claimed| {
let ctx = ctx.clone();
tokio::task::spawn_blocking(move || {
let result = match callback(params, ctx) {
Ok(res) => sink.send_response(id, res),
Err(err) => sink.send_call_error(id, err),
};
// Release claimed resources
drop(claimed);
.map(|result| match result {
Ok(r) => r,
Err(err) => {
tracing::error!("Join error for blocking RPC method: {:?}", err);
false
}
})
.boxed()
})),
)?;
Ok(MethodResourcesBuilder { build: ResourceVec::new(), callback })
}
/// Register a new RPC subscription that invokes s callback on every subscription call.
///
/// This method ensures that the `subscription_method_name` and `unsubscription_method_name` are unique.
/// The `notif_method_name` argument sets the content of the `method` field in the JSON document that
/// the server sends back to the client. The uniqueness of this value is not machine checked and it's up to
/// the user to ensure it is not used in any other [`RpcModule`] used in the server.
///
/// # Arguments
///
/// * `subscription_method_name` - name of the method to call to initiate a subscription
/// * `notif_method_name` - name of method to be used in the subscription payload (technically a JSON-RPC notification)
/// * `unsubscription_method` - name of the method to call to terminate a subscription
/// * `callback` - A callback to invoke on each subscription; it takes three parameters:
/// - [`Params`]: JSON-RPC parameters in the subscription call.
/// - [`SubscriptionSink`]: A sink to send messages to the subscriber.
/// - Context: Any type that can be embedded into the [`RpcModule`].
///
/// # Examples
///
/// ```no_run
///
/// use jsonrpsee_utils::server::rpc_module::RpcModule;
///
/// ctx.register_subscription("sub", "notif_name", "unsub", |params, mut sink, ctx| {
/// std::thread::spawn(move || {
/// });
/// Ok(())
/// });
/// ```
pub fn register_subscription<F>(
&mut self,
subscribe_method_name: &'static str,
notif_method_name: &'static str,
unsubscribe_method_name: &'static str,
callback: F,
) -> Result<(), Error>
where
F: Fn(Params, SubscriptionSink, Arc<Context>) -> Result<(), Error> + Send + Sync + 'static,
if subscribe_method_name == unsubscribe_method_name {
return Err(Error::SubscriptionNameConflict(subscribe_method_name.into()));
}
self.methods.verify_method_name(subscribe_method_name)?;
self.methods.verify_method_name(unsubscribe_method_name)?;
let subscribers = Subscribers::default();
let subscribers = subscribers.clone();
self.methods.mut_callbacks().insert(
MethodCallback::new_sync(Arc::new(move |id, params, method_sink, conn_id| {
let (conn_tx, conn_rx) = oneshot::channel::<()>();
let sub_id = {
const JS_NUM_MASK: SubscriptionId = !0 >> 11;
let sub_id = rand::random::<SubscriptionId>() & JS_NUM_MASK;
let uniq_sub = SubscriptionKey { conn_id, sub_id };
subscribers.lock().insert(uniq_sub, (method_sink.clone(), conn_rx));
method_sink.send_response(id.clone(), sub_id);
let sink = SubscriptionSink {
inner: method_sink.clone(),
method: notif_method_name,
subscribers: subscribers.clone(),
uniq_sub: SubscriptionKey { conn_id, sub_id },
is_connected: Some(conn_tx),
if let Err(err) = callback(params, sink, ctx.clone()) {
"subscribe call '{}' failed: {:?}, request id={:?}",
subscribe_method_name,
err,
id
);
method_sink.send_error(id, ErrorCode::ServerError(CALL_EXECUTION_FAILED_CODE).into())
} else {
true
self.methods.mut_callbacks().insert(
MethodCallback::new_sync(Arc::new(move |id, params, sink, conn_id| {
let sub_id = match params.one() {
Ok(sub_id) => sub_id,
Err(_) => {
"unsubscribe call '{}' failed: couldn't parse subscription id={:?} request id={:?}",
let err = to_json_raw_value(&"Invalid subscription ID type, must be integer").ok();
return sink.send_error(id, invalid_subscription_err(err.as_deref()));
if subscribers.lock().remove(&SubscriptionKey { conn_id, sub_id }).is_some() {
} else {
let err = to_json_raw_value(&format!("Invalid subscription ID={}", sub_id)).ok();
sink.send_error(id, invalid_subscription_err(err.as_deref()))
/// Register an alias for an existing_method. Alias uniqueness is enforced.
pub fn register_alias(&mut self, alias: &'static str, existing_method: &'static str) -> Result<(), Error> {
self.methods.verify_method_name(alias)?;
let callback = match self.methods.callbacks.get(existing_method) {
Some(callback) => callback.clone(),
None => return Err(Error::MethodNotFound(existing_method.into())),
};
self.methods.mut_callbacks().insert(alias, callback);
/// Represents a single subscription.
#[derive(Debug)]
pub struct SubscriptionSink {
/// Sink.
/// Unique subscription.
uniq_sub: SubscriptionKey,
/// Shared Mutex of subscriptions for this method.
subscribers: Subscribers,
/// A type to track whether the subscription is active (the subscriber is connected).
///
/// None - implies that the subscription as been closed.
is_connected: Option<oneshot::Sender<()>>,
}
impl SubscriptionSink {
pub fn send<T: Serialize>(&mut self, result: &T) -> Result<(), Error> {
let msg = self.build_message(result)?;
self.inner_send(msg).map_err(Into::into)
fn build_message<T: Serialize>(&self, result: &T) -> Result<String, Error> {
serde_json::to_string(&SubscriptionResponse::new(
self.method.into(),
SubscriptionPayload { subscription: RpcSubscriptionId::Num(self.uniq_sub.sub_id), result },
))
.map_err(Into::into)
fn inner_send(&mut self, msg: String) -> Result<(), Error> {
let res = match self.is_connected.as_ref() {
Some(conn) if !conn.is_canceled() => {
// unbounded send only fails if the receiver has been dropped.
Some(SubscriptionClosedError::new("Closed by the client (connection reset)", self.uniq_sub.sub_id))
})
Some(_) => Err(Some(SubscriptionClosedError::new("Closed by unsubscribe call", self.uniq_sub.sub_id))),
// NOTE(niklasad1): this should be unreachble, after the first error is detected the subscription is closed.
None => Err(None),
if let Err(Some(e)) = &res {
self.inner_close(e);
res.map_err(|e| {
let err = e.unwrap_or_else(|| SubscriptionClosedError::new("Close reason unknown", self.uniq_sub.sub_id));
Error::SubscriptionClosed(err)
})
/// Close the subscription sink with a customized error message.
pub fn close(&mut self, msg: &str) {
let err = SubscriptionClosedError::new(msg, self.uniq_sub.sub_id);
self.inner_close(&err);
}
fn inner_close(&mut self, err: &SubscriptionClosedError) {
self.is_connected.take();
if let Some((sink, _)) = self.subscribers.lock().remove(&self.uniq_sub) {
tracing::debug!("Closing subscription: {:?}", self.uniq_sub.sub_id);
let msg = self.build_message(err).expect("valid json infallible; qed");
impl Drop for SubscriptionSink {
fn drop(&mut self) {
let err = SubscriptionClosedError::new("Closed by the server", self.uniq_sub.sub_id);
self.inner_close(&err);
/// Wrapper struct that maintains a subscription "mainly" for testing.
pub struct Subscription {
tx: mpsc::UnboundedSender<String>,
rx: mpsc::UnboundedReceiver<String>,
sub_id: u64,
}
impl Subscription {
/// Close the subscription channel.
pub fn close(&mut self) {
self.tx.close_channel();
}
/// Get the subscription ID
pub fn subscription_id(&self) -> u64 {
self.sub_id
}
Niklas Adolfsson
committed
/// Returns `Some((val, sub_id))` for the next element of type T from the underlying stream,
/// otherwise `None` if the subscription was closed.
Niklas Adolfsson
committed
/// # Panics
///
/// If the decoding the value as `T` fails.
pub async fn next<T: DeserializeOwned>(
&mut self,
) -> Option<Result<(T, jsonrpsee_types::v2::SubscriptionId<'static>), Error>> {
Niklas Adolfsson
committed
let raw = self.rx.next().await?;
let res = serde_json::from_str::<SubscriptionResponse<T>>(&raw)
.map(|v| (v.params.result, v.params.subscription.into_owned()))
.map_err(Into::into);
Some(res)
impl Drop for Subscription {
fn drop(&mut self) {
self.close();
}
}
#[cfg(test)]
mod tests {
use super::*;
use jsonrpsee_types::{v2, EmptyParams};
use serde::Deserialize;
use std::collections::HashMap;
Niklas Adolfsson
committed
fn rpc_modules_with_different_contexts_can_be_merged() {
mod1.register_method("bla with Vec context", |_: Params, _| Ok(())).unwrap();
mod2.register_method("bla with String context", |_: Params, _| Ok(())).unwrap();
assert!(mod1.method("bla with Vec context").is_some());
assert!(mod1.method("bla with String context").is_some());
}
#[test]
fn rpc_context_modules_can_register_subscriptions() {
let cx = ();
let _subscription = cxmodule.register_subscription("hi", "hi", "goodbye", |_, _, _| Ok(()));
assert!(cxmodule.method("hi").is_some());
assert!(cxmodule.method("goodbye").is_some());
#[test]
fn rpc_register_alias() {
let mut module = RpcModule::new(());
module.register_method("hello_world", |_: Params, _| Ok(())).unwrap();
module.register_alias("hello_foobar", "hello_world").unwrap();
assert!(module.method("hello_world").is_some());
assert!(module.method("hello_foobar").is_some());
Niklas Adolfsson
committed
#[tokio::test]
async fn calling_method_without_server() {
// Call sync method with no params
let mut module = RpcModule::new(());
module.register_method("boo", |_: Params, _| Ok(String::from("boo!"))).unwrap();
let res: String = module.call("boo", EmptyParams::new()).await.unwrap();
assert_eq!(&res, "boo!");
Niklas Adolfsson
committed
// Call sync method with params
module
.register_method("foo", |params, _| {
Niklas Adolfsson
committed
Ok(n * 2)
})
.unwrap();
let res: u64 = module.call("foo", [3_u64]).await.unwrap();
assert_eq!(res, 6);
// Call sync method with bad param
let err = module.call::<_, ()>("foo", (false,)).await.unwrap_err();
assert!(
matches!(err, Error::Request(err) if err == r#"{"jsonrpc":"2.0","error":{"code":-32602,"message":"invalid type: boolean `false`, expected u16 at line 1 column 6"},"id":0}"#)
Niklas Adolfsson
committed
// Call async method with params and context
struct MyContext;
impl MyContext {
fn roo(&self, things: Vec<u8>) -> u16 {
things.iter().sum::<u8>().into()
}
}
let mut module = RpcModule::new(MyContext);
module
.register_async_method("roo", |params, ctx| {
let ns: Vec<u8> = params.parse().expect("valid params please");
Niklas Adolfsson
committed
})
.unwrap();
let res: u64 = module.call("roo", [12, 13]).await.unwrap();
assert_eq!(res, 25);
Niklas Adolfsson
committed
#[tokio::test]
async fn calling_method_without_server_using_proc_macro() {
use jsonrpsee::{proc_macros::rpc, types::async_trait};
// Setup
#[derive(Debug, Deserialize, Serialize)]
#[allow(unreachable_pub)]
pub struct Gun {
shoots: bool,
}
Niklas Adolfsson
committed
#[derive(Debug, Deserialize, Serialize)]
#[allow(unreachable_pub)]
pub struct Beverage {
ice: bool,
}
Niklas Adolfsson
committed
#[rpc(server)]
pub trait Cool {
/// Sync method, no params.
#[method(name = "rebel_without_cause")]
fn rebel_without_cause(&self) -> Result<bool, Error>;
Niklas Adolfsson
committed
/// Sync method.
#[method(name = "rebel")]
fn rebel(&self, gun: Gun, map: HashMap<u8, u8>) -> Result<String, Error>;
/// Async method.
#[method(name = "revolution")]
async fn can_have_any_name(&self, beverage: Beverage, some_bytes: Vec<u8>) -> Result<String, Error>;
}
Niklas Adolfsson
committed
Niklas Adolfsson
committed
#[async_trait]
impl CoolServer for CoolServerImpl {
fn rebel_without_cause(&self) -> Result<bool, Error> {
Ok(false)
}
fn rebel(&self, gun: Gun, map: HashMap<u8, u8>) -> Result<String, Error> {
Ok(format!("{} {:?}", map.values().len(), gun))
}
Niklas Adolfsson
committed
async fn can_have_any_name(&self, beverage: Beverage, some_bytes: Vec<u8>) -> Result<String, Error> {
Ok(format!("drink: {:?}, phases: {:?}", beverage, some_bytes))