Snapshot sync part 2 (#2098)

* Split block downloader into a module

* Snapshot sync progress

* Warp sync CLI option

* Increased snapshot chunk and ping timeouts

* Fixed an issue with delayed writes

* Updated bootnodes

* Don't run pending IO tasks on shutdown

* Optional first_block; removed insert_snapshot_block

* Fixing expect calls

* Fixed stalled sync

* style and docs

* Update block_sync.rs

[ci:skip]

util/io/src/worker.rs

@@ -101,11 +101,11 @@ impl Worker {
 				let _ = wait.wait(lock);
 			}
 
-			if deleting.load(AtomicOrdering::Acquire) {
-				return;
-			}
-			while let chase_lev::Steal::Data(work) = stealer.steal() {
-				Worker::do_work(work, channel.clone());
+			while !deleting.load(AtomicOrdering::Acquire) {
+				match stealer.steal() {
+					chase_lev::Steal::Data(work) => Worker::do_work(work, channel.clone()),
+					_ => break,
+				}
 			}
 		}
 	}

util/network/src/connection.rs

@@ -106,10 +106,11 @@ impl<Socket: GenericSocket> GenericConnection<Socket> {
 	/// Add a packet to send queue.
 	pub fn send<Message>(&mut self, io: &IoContext<Message>, data: Bytes) where Message: Send + Clone {
 		if !data.is_empty() {
+			trace!(target:"network", "{}: Sending {} bytes", self.token, data.len());
 			self.send_queue.push_back(Cursor::new(data));
-		}
-		if !self.interest.is_writable() {
-			self.interest.insert(EventSet::writable());
+			if !self.interest.is_writable() {
+				self.interest.insert(EventSet::writable());
+			}
 			io.update_registration(self.token).ok();
 		}
 	}

util/network/src/session.rs

@@ -30,7 +30,7 @@ use node_table::NodeId;
 use stats::NetworkStats;
 use time;
 
-const PING_TIMEOUT_SEC: u64 = 30;
+const PING_TIMEOUT_SEC: u64 = 65;
 const PING_INTERVAL_SEC: u64 = 30;
 
 /// Peer session over encrypted connection.

util/src/standard.rs

@@ -46,4 +46,4 @@ pub use rustc_serialize::hex::{FromHex, FromHexError};
 pub use heapsize::HeapSizeOf;
 pub use itertools::Itertools;
 
-pub use parking_lot::{Condvar, Mutex, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard};
+pub use parking_lot::{Condvar, Mutex, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard};