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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154

use std::marker::PhantomData;
use std::sync::Arc;

use crate::core::futures::IntoFuture;
use crate::core::{self, Error, Metadata, Params, RemoteProcedure, RpcMethod, Value};
use crate::handler::{SubscribeRpcMethod, UnsubscribeRpcMethod};
use crate::subscription::{new_subscription, Subscriber};
use crate::types::{PubSubMetadata, SubscriptionId};

struct DelegateSubscription<T, F> {
	delegate: Arc<T>,
	closure: F,
}

impl<T, M, F> SubscribeRpcMethod<M> for DelegateSubscription<T, F>
where
	M: PubSubMetadata,
	F: Fn(&T, Params, M, Subscriber),
	T: Send + Sync + 'static,
	F: Send + Sync + 'static,
{
	fn call(&self, params: Params, meta: M, subscriber: Subscriber) {
		let closure = &self.closure;
		closure(&self.delegate, params, meta, subscriber)
	}
}

impl<M, T, F, I> UnsubscribeRpcMethod<M> for DelegateSubscription<T, F>
where
	M: PubSubMetadata,
	F: Fn(&T, SubscriptionId, Option<M>) -> I,
	I: IntoFuture<Item = Value, Error = Error>,
	T: Send + Sync + 'static,
	F: Send + Sync + 'static,
	I::Future: Send + 'static,
{
	type Out = I::Future;
	fn call(&self, id: SubscriptionId, meta: Option<M>) -> Self::Out {
		let closure = &self.closure;
		closure(&self.delegate, id, meta).into_future()
	}
}

/// Wire up rpc subscriptions to `delegate` struct
pub struct IoDelegate<T, M = ()>
where
	T: Send + Sync + 'static,
	M: Metadata,
{
	inner: core::IoDelegate<T, M>,
	delegate: Arc<T>,
	_data: PhantomData<M>,
}

impl<T, M> IoDelegate<T, M>
where
	T: Send + Sync + 'static,
	M: PubSubMetadata,
{
	/// Creates new `PubSubIoDelegate`, wrapping the core IoDelegate
	pub fn new(delegate: Arc<T>) -> Self {
		IoDelegate {
			inner: core::IoDelegate::new(delegate.clone()),
			delegate,
			_data: PhantomData,
		}
	}

	/// Adds subscription to the delegate.
	pub fn add_subscription<Sub, Unsub, I>(&mut self, name: &str, subscribe: (&str, Sub), unsubscribe: (&str, Unsub))
	where
		Sub: Fn(&T, Params, M, Subscriber),
		Sub: Send + Sync + 'static,
		Unsub: Fn(&T, SubscriptionId, Option<M>) -> I,
		I: IntoFuture<Item = Value, Error = Error>,
		Unsub: Send + Sync + 'static,
		I::Future: Send + 'static,
	{
		let (sub, unsub) = new_subscription(
			name,
			DelegateSubscription {
				delegate: self.delegate.clone(),
				closure: subscribe.1,
			},
			DelegateSubscription {
				delegate: self.delegate.clone(),
				closure: unsubscribe.1,
			},
		);
		self.inner
			.add_method_with_meta(subscribe.0, move |_, params, meta| sub.call(params, meta));
		self.inner
			.add_method_with_meta(unsubscribe.0, move |_, params, meta| unsub.call(params, meta));
	}

	/// Adds an alias to existing method.
	pub fn add_alias(&mut self, from: &str, to: &str) {
		self.inner.add_alias(from, to)
	}

	/// Adds async method to the delegate.
	pub fn add_method<F, I>(&mut self, name: &str, method: F)
	where
		F: Fn(&T, Params) -> I,
		I: IntoFuture<Item = Value, Error = Error>,
		F: Send + Sync + 'static,
		I::Future: Send + 'static,
	{
		self.inner.add_method(name, method)
	}

	/// Adds async method with metadata to the delegate.
	pub fn add_method_with_meta<F, I>(&mut self, name: &str, method: F)
	where
		F: Fn(&T, Params, M) -> I,
		I: IntoFuture<Item = Value, Error = Error>,
		F: Send + Sync + 'static,
		I::Future: Send + 'static,
	{
		self.inner.add_method_with_meta(name, method)
	}

	/// Adds notification to the delegate.
	pub fn add_notification<F>(&mut self, name: &str, notification: F)
	where
		F: Fn(&T, Params),
		F: Send + Sync + 'static,
	{
		self.inner.add_notification(name, notification)
	}
}

impl<T, M> core::IoHandlerExtension<M> for IoDelegate<T, M>
where
	T: Send + Sync + 'static,
	M: Metadata,
{
	fn augment<S: core::Middleware<M>>(self, handler: &mut core::MetaIoHandler<M, S>) {
		handler.extend_with(self.inner)
	}
}

impl<T, M> IntoIterator for IoDelegate<T, M>
where
	T: Send + Sync + 'static,
	M: Metadata,
{
	type Item = (String, RemoteProcedure<M>);
	type IntoIter = <core::IoDelegate<T, M> as IntoIterator>::IntoIter;

	fn into_iter(self) -> Self::IntoIter {
		self.inner.into_iter()
	}
}