Allow Poll Lifetime to be configured via CLI (#8885)

... rather than it being a hard-coded constant. fixes #5484 .

rpc/src/v1/impls/eth.rs

@@ -65,6 +65,8 @@ pub struct EthClientOptions {
 	pub send_block_number_in_get_work: bool,
 	/// Gas Price Percentile used as default gas price.
 	pub gas_price_percentile: usize,
+	/// Set the timeout for the internal poll manager
+	pub poll_lifetime: u32
 }
 
 impl EthClientOptions {
@@ -83,6 +85,7 @@ impl Default for EthClientOptions {
 			pending_nonce_from_queue: false,
 			allow_pending_receipt_query: true,
 			send_block_number_in_get_work: true,
+			poll_lifetime: 60u32,
 			gas_price_percentile: 50,
 		}
 	}

rpc/src/v1/impls/eth_filter.rs

@@ -66,11 +66,11 @@ pub struct EthFilterClient<C, M> {
 
 impl<C, M> EthFilterClient<C, M> {
 	/// Creates new Eth filter client.
-	pub fn new(client: Arc<C>, miner: Arc<M>) -> Self {
+	pub fn new(client: Arc<C>, miner: Arc<M>, poll_lifetime: u32) -> Self {
 		EthFilterClient {
 			client: client,
 			miner: miner,
-			polls: Mutex::new(PollManager::new()),
+			polls: Mutex::new(PollManager::new(poll_lifetime)),
 		}
 	}
 }

rpc/src/v1/impls/light/eth.rs

@@ -62,6 +62,7 @@ pub struct EthClient<T> {
 	accounts: Arc<AccountProvider>,
 	cache: Arc<Mutex<LightDataCache>>,
 	polls: Mutex<PollManager<PollFilter>>,
+	poll_lifetime: u32,
 	gas_price_percentile: usize,
 }
 
@@ -92,7 +93,8 @@ impl<T> Clone for EthClient<T> {
 			transaction_queue: self.transaction_queue.clone(),
 			accounts: self.accounts.clone(),
 			cache: self.cache.clone(),
-			polls: Mutex::new(PollManager::new()),
+			polls: Mutex::new(PollManager::new(self.poll_lifetime)),
+			poll_lifetime: self.poll_lifetime,
 			gas_price_percentile: self.gas_price_percentile,
 		}
 	}
@@ -109,6 +111,7 @@ impl<T: LightChainClient + 'static> EthClient<T> {
 		accounts: Arc<AccountProvider>,
 		cache: Arc<Mutex<LightDataCache>>,
 		gas_price_percentile: usize,
+		poll_lifetime: u32
 	) -> Self {
 		EthClient {
 			sync,
@@ -117,7 +120,8 @@ impl<T: LightChainClient + 'static> EthClient<T> {
 			transaction_queue,
 			accounts,
 			cache,
-			polls: Mutex::new(PollManager::new()),
+			polls: Mutex::new(PollManager::new(poll_lifetime)),
+			poll_lifetime,
 			gas_price_percentile,
 		}
 	}