1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103

use crate::types::{Error, Params, Value};
use crate::BoxFuture;
use futures::{Future, IntoFuture};
use std::fmt;
use std::sync::Arc;

/// Metadata trait
pub trait Metadata: Clone + Send + 'static {}
impl Metadata for () {}
impl<T: Metadata> Metadata for Option<T> {}
impl<T: Metadata> Metadata for Box<T> {}
impl<T: Sync + Send + 'static> Metadata for Arc<T> {}

/// Asynchronous Method
pub trait RpcMethodSimple: Send + Sync + 'static {
	/// Output future
	type Out: Future<Item = Value, Error = Error> + Send;
	/// Call method
	fn call(&self, params: Params) -> Self::Out;
}

/// Asynchronous Method with Metadata
pub trait RpcMethod<T: Metadata>: Send + Sync + 'static {
	/// Call method
	fn call(&self, params: Params, meta: T) -> BoxFuture<Value>;
}

/// Notification
pub trait RpcNotificationSimple: Send + Sync + 'static {
	/// Execute notification
	fn execute(&self, params: Params);
}

/// Notification with Metadata
pub trait RpcNotification<T: Metadata>: Send + Sync + 'static {
	/// Execute notification
	fn execute(&self, params: Params, meta: T);
}

/// Possible Remote Procedures with Metadata
#[derive(Clone)]
pub enum RemoteProcedure<T: Metadata> {
	/// A method call
	Method(Arc<dyn RpcMethod<T>>),
	/// A notification
	Notification(Arc<dyn RpcNotification<T>>),
	/// An alias to other method,
	Alias(String),
}

impl<T: Metadata> fmt::Debug for RemoteProcedure<T> {
	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
		use self::RemoteProcedure::*;
		match *self {
			Method(..) => write!(fmt, "<method>"),
			Notification(..) => write!(fmt, "<notification>"),
			Alias(ref alias) => write!(fmt, "alias => {:?}", alias),
		}
	}
}

impl<F: Send + Sync + 'static, X: Send + 'static, I> RpcMethodSimple for F
where
	F: Fn(Params) -> I,
	X: Future<Item = Value, Error = Error>,
	I: IntoFuture<Item = Value, Error = Error, Future = X>,
{
	type Out = X;
	fn call(&self, params: Params) -> Self::Out {
		self(params).into_future()
	}
}

impl<F: Send + Sync + 'static> RpcNotificationSimple for F
where
	F: Fn(Params),
{
	fn execute(&self, params: Params) {
		self(params)
	}
}

impl<F: Send + Sync + 'static, X: Send + 'static, T, I> RpcMethod<T> for F
where
	T: Metadata,
	F: Fn(Params, T) -> I,
	I: IntoFuture<Item = Value, Error = Error, Future = X>,
	X: Future<Item = Value, Error = Error>,
{
	fn call(&self, params: Params, meta: T) -> BoxFuture<Value> {
		Box::new(self(params, meta).into_future())
	}
}

impl<F: Send + Sync + 'static, T> RpcNotification<T> for F
where
	T: Metadata,
	F: Fn(Params, T),
{
	fn execute(&self, params: Params, meta: T) {
		self(params, meta)
	}
}