jsonrpc-derive 14.0.2

High level, typed wrapper for jsonrpc_core.

Enables creation of "Service" objects grouping a set of RPC methods together in a typed manner.

Example

use jsonrpc_derive::rpc;
use jsonrpc_core::{IoHandler, Error, Result};
use jsonrpc_core::futures::future::{self, FutureResult};

#[rpc(server)]
pub trait Rpc {
#[rpc(name = "protocolVersion")]
fn protocol_version(&self) -> Result<String>;

#[rpc(name = "add")]
fn add(&self, a: u64, b: u64) -> Result<u64>;

#[rpc(name = "callAsync")]
fn call(&self, a: u64) -> FutureResult<String, Error>;
}

struct RpcImpl;
impl Rpc for RpcImpl {
fn protocol_version(&self) -> Result<String> {
Ok("version1".into())
}

fn add(&self, a: u64, b: u64) -> Result<u64> {
Ok(a + b)
}

fn call(&self, _: u64) -> FutureResult<String, Error> {
future::ok("OK".to_owned()).into()
}
}

fn main() {
let mut io = IoHandler::new();
let rpc = RpcImpl;

io.extend_with(rpc.to_delegate());
}

Pub/Sub Example

Each subscription must have subscribe and unsubscribe methods. They can have any name but must be annotated with subscribe or unsubscribe and have a matching unique subscription name.

use std::thread;
use std::sync::{atomic, Arc, RwLock};
use std::collections::HashMap;

use jsonrpc_core::{Error, ErrorCode, Result};
use jsonrpc_core::futures::Future;
use jsonrpc_derive::rpc;
use jsonrpc_pubsub::{Session, PubSubHandler, SubscriptionId, typed::{Subscriber, Sink}};

#[rpc]
pub trait Rpc {
type Metadata;

/// Hello subscription
#[pubsub(
subscription = "hello",
subscribe,
name = "hello_subscribe",
alias("hello_sub")
)]
fn subscribe(&self, _: Self::Metadata, _: Subscriber<String>, param: u64);

/// Unsubscribe from hello subscription.
#[pubsub(
subscription = "hello",
unsubscribe,
name = "hello_unsubscribe"
)]
fn unsubscribe(&self, _: Option<Self::Metadata>, _: SubscriptionId) -> Result<bool>;
}


#[derive(Default)]
struct RpcImpl {
uid: atomic::AtomicUsize,
active: Arc<RwLock<HashMap<SubscriptionId, Sink<String>>>>,
}
impl Rpc for RpcImpl {
type Metadata = Arc<Session>;

fn subscribe(&self, _meta: Self::Metadata, subscriber: Subscriber<String>, param: u64) {
if param != 10 {
subscriber.reject(Error {
code: ErrorCode::InvalidParams,
message: "Rejecting subscription - invalid parameters provided.".into(),
data: None,
}).unwrap();
return;
}

let id = self.uid.fetch_add(1, atomic::Ordering::SeqCst);
let sub_id = SubscriptionId::Number(id as u64);
let sink = subscriber.assign_id(sub_id.clone()).unwrap();
self.active.write().unwrap().insert(sub_id, sink);
}

fn unsubscribe(&self, _meta: Option<Self::Metadata>, id: SubscriptionId) -> Result<bool> {
let removed = self.active.write().unwrap().remove(&id);
if removed.is_some() {
Ok(true)
} else {
Err(Error {
code: ErrorCode::InvalidParams,
message: "Invalid subscription.".into(),
data: None,
})
}
}
}

# fn main() {}

Client Example

use jsonrpc_core_client::transports::local;
use jsonrpc_core::futures::future::{self, Future, FutureResult};
use jsonrpc_core::{Error, IoHandler, Result};
use jsonrpc_derive::rpc;

/// Rpc trait
#[rpc]
pub trait Rpc {
/// Returns a protocol version
#[rpc(name = "protocolVersion")]
fn protocol_version(&self) -> Result<String>;

/// Adds two numbers and returns a result
#[rpc(name = "add", alias("callAsyncMetaAlias"))]
fn add(&self, a: u64, b: u64) -> Result<u64>;

/// Performs asynchronous operation
#[rpc(name = "callAsync")]
fn call(&self, a: u64) -> FutureResult<String, Error>;
}

struct RpcImpl;

impl Rpc for RpcImpl {
fn protocol_version(&self) -> Result<String> {
Ok("version1".into())
}

fn add(&self, a: u64, b: u64) -> Result<u64> {
Ok(a + b)
}

fn call(&self, _: u64) -> FutureResult<String, Error> {
future::ok("OK".to_owned())
}
}

fn main() {
let mut io = IoHandler::new();
io.extend_with(RpcImpl.to_delegate());

let fut = {
let (client, server) = local::connect::<gen_client::Client, _, _>(io);
client.add(5, 6).map(|res| println!("5 + 6 = {}", res)).join(server)
};
fut.wait().unwrap();
}