Strip device suffix before resolving hostname. (#243)

lib/async/scheduler.rb

@@ -156,6 +156,9 @@ def kernel_sleep(duration = nil)
 
 		# @asynchronous May be non-blocking..
 		def address_resolve(hostname)
+			# On some platforms, hostnames may contain a device-specific suffix (e.g. %en0). We need to strip this before resolving.
+			# See <https://github.com/socketry/async/issues/180> for more details.
+			hostname = hostname.split("%", 2).first
 			::Resolv.getaddresses(hostname)
 		end
 

test/async/scheduler/address.rb

@@ -15,5 +15,23 @@
 
 			expect(addresses).not.to be(:empty?)
 		end
+
+		it "can resolve ipv4 addresses" do
+			address = Addrinfo.getaddrinfo("127.0.0.1", "80").first
+
+			expect(address.ipv4?).to be == true
+		end
+
+		it "can resolve ipv6 addresses" do
+			address = Addrinfo.getaddrinfo("::1", "80").first
+
+			expect(address.ipv6?).to be == true
+		end
+
+		it "can resolve ipv6 addresses with device suffix" do
+			address = Addrinfo.getaddrinfo("::1%lo0", "80").first
+
+			expect(address.ipv6?).to be == true
+		end
 	end
 end