Watch existing extrinsics RPC (#3873)

* Transaction pool watch intristics.

* Track extrinsic rpc methods.

* Test for pool watcher.

* Track extrinsic rpc test.

* Fix rpc naming.

* review fixes

* Update jsonrpc and use une subcription.

* Naming and dependencies.

substrate/core/rpc/api/Cargo.toml

@@ -8,10 +8,10 @@ edition = "2018"
 codec = { package = "parity-scale-codec", version = "1.0.0" }
 derive_more = "0.15.0"
 futures03 = { package = "futures-preview", version = "0.3.0-alpha.19", features = ["compat"] }
-jsonrpc-core = "13.2.0"
-jsonrpc-core-client = "13.2.0"
-jsonrpc-derive = "13.2.0"
-jsonrpc-pubsub = "13.2.0"
+jsonrpc-core = "14.0"
+jsonrpc-core-client = "14.0"
+jsonrpc-derive = "14.0"
+jsonrpc-pubsub = "14.0"
 log = "0.4.8"
 parking_lot = "0.9.0"
 primitives = { package = "substrate-primitives", path = "../../primitives" }

substrate/core/rpc/api/src/author/mod.rs

@@ -67,7 +67,7 @@ pub trait AuthorApi<Hash, BlockHash> {
 		subscribe,
 		name = "author_submitAndWatchExtrinsic"
 	)]
-	fn watch_extrinsic(&self,
+	fn submit_and_watch_extrinsic(&self,
 		metadata: Self::Metadata,
 		subscriber: Subscriber<Status<Hash, BlockHash>>,
 		bytes: Bytes
@@ -83,4 +83,16 @@ pub trait AuthorApi<Hash, BlockHash> {
 		metadata: Option<Self::Metadata>,
 		id: SubscriptionId
 	) -> Result<bool>;
+
+	/// Watch multiple extrinsics (own or from network)
+	#[pubsub(
+		subscription = "author_extrinsicUpdate",
+		subscribe,
+		name = "author_watchExtrinsic"
+	)]
+	fn watch_extrinsic(&self,
+    	metadata: Self::Metadata,
+		subscriber: Subscriber<Status<Hash, BlockHash>>,
+	    hash: Hash,
+	);
 }