From b161100d1919c1d4c678d91a1f49ecca1747327e Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Tue, 21 May 2019 15:25:33 -0400
Subject: [PATCH] Regularly poll other dnsseeds for new addrs

---
 src/datastore.rs | 42 +++++++++++++++++++++++++-----------------
 src/main.rs      | 24 +++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 18 deletions(-)

diff --git a/src/datastore.rs b/src/datastore.rs
index 18aa0e6..26ed96b 100644
--- a/src/datastore.rs
+++ b/src/datastore.rs
@@ -292,27 +292,35 @@ impl Store {
 		*self.subver_regex.write().unwrap() = Arc::new(value);
 	}
 
-	pub fn add_fresh_nodes(&self, addresses: &Vec<(u32, Address)>) {
+	pub fn add_fresh_addrs<I: Iterator<Item=SocketAddr>>(&self, addresses: I) -> u64 {
+		let mut res = 0;
 		let mut nodes = self.nodes.write().unwrap();
 		let cur_time = Instant::now();
-		for &(_, ref addr) in addresses {
-			if let Ok(socketaddr) = addr.socket_addr() {
-				match nodes.nodes_to_state.entry(socketaddr.clone()) {
-					hash_map::Entry::Vacant(e) => {
-						e.insert(Node {
-							state: AddressState::Untested,
-							last_services: 0,
-							last_update: cur_time,
-							last_good: Instant::now(),
-						});
-						nodes.state_next_scan.get_mut(&AddressState::Untested).unwrap().push((cur_time, socketaddr));
-					},
-					hash_map::Entry::Occupied(_) => {},
-				}
-			} else {
-				//TODO: Handle onions
+		for addr in addresses {
+			match nodes.nodes_to_state.entry(addr.clone()) {
+				hash_map::Entry::Vacant(e) => {
+					e.insert(Node {
+						state: AddressState::Untested,
+						last_services: 0,
+						last_update: cur_time,
+						last_good: Instant::now(),
+					});
+					nodes.state_next_scan.get_mut(&AddressState::Untested).unwrap().push((cur_time, addr));
+					res += 1;
+				},
+				hash_map::Entry::Occupied(_) => {},
 			}
 		}
+		res
+	}
+
+	pub fn add_fresh_nodes(&self, addresses: &Vec<(u32, Address)>) {
+		self.add_fresh_addrs(addresses.iter().filter_map(|(_, addr)| {
+			match addr.socket_addr() {
+				Ok(socketaddr) => Some(socketaddr),
+				Err(_) => None, // TODO: Handle onions
+			}
+		}));
 	}
 
 	pub fn set_node_state(&self, addr: SocketAddr, state: AddressState, services: u64) -> AddressState {
diff --git a/src/main.rs b/src/main.rs
index be4c8fc..be27835 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,7 +9,7 @@ use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 use std::sync::atomic::{Ordering, AtomicBool};
 use std::time::{Duration, Instant};
-use std::net::SocketAddr;
+use std::net::{SocketAddr, ToSocketAddrs};
 
 use bitcoin_hashes::sha256d;
 
@@ -189,9 +189,30 @@ pub fn scan_node(scan_time: Instant, node: SocketAddr) {
 	}));
 }
 
+fn poll_dnsseeds() {
+	tokio::spawn(future::lazy(|| {
+		let printer = unsafe { PRINTER.as_ref().unwrap() };
+		let store = unsafe { DATA_STORE.as_ref().unwrap() };
+
+		let mut new_addrs = 0;
+		for seed in ["seed.bitcoin.sipa.be", "dnsseed.bitcoin.dashjr.org", "seed.bitcoinstats.com", "seed.bitcoin.jonasschnelli.ch", "seed.btc.petertodd.org", "seed.bitcoin.sprovoost.nl", "dnsseed.emzy.de"].iter() {
+			new_addrs += store.add_fresh_addrs((*seed, 8333u16).to_socket_addrs().unwrap_or(Vec::new().into_iter()));
+			new_addrs += store.add_fresh_addrs((("x9.".to_string() + seed).as_str(), 8333u16).to_socket_addrs().unwrap_or(Vec::new().into_iter()));
+		}
+		printer.add_line(format!("Added {} new addresses from other DNS seeds", new_addrs), false);
+		Delay::new(Instant::now() + Duration::from_secs(60)).then(|_| {
+			if !START_SHUTDOWN.load(Ordering::Relaxed) {
+				poll_dnsseeds();
+			}
+			future::ok(())
+		})
+	}));
+}
+
 fn scan_net() {
 	tokio::spawn(future::lazy(|| {
 		let store = unsafe { DATA_STORE.as_ref().unwrap() };
+
 		let mut scan_nodes = store.get_next_scan_nodes();
 		let per_iter_time = Duration::from_millis(1000 / store.get_u64(U64Setting::ConnsPerSec));
 		let start_time = Instant::now();
@@ -270,6 +291,7 @@ fn make_trusted_conn(trusted_sockaddr: SocketAddr) {
 						if top_height >= starting_height as u64 {
 							if !SCANNING.swap(true, Ordering::SeqCst) {
 								scan_net();
+								poll_dnsseeds();
 							}
 						}
 					} else {
-- 
2.39.5