Replace hard coded port by dynamic available one

Fixes #84.

Cargo.lock

@@ -1151,6 +1151,12 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "get-port"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac6c41a39c60ae1fc5bf0e220347ce90fa1e4bb0fcdac65b09bb5f4576bebc84"
+
 [[package]]
 name = "get_if_addrs"
 version = "0.5.2"
@@ -3312,6 +3318,7 @@ dependencies = [
  "ecdsa_fun",
  "futures",
  "genawaiter",
+ "get-port",
  "hyper",
  "libp2p",
  "libp2p-tokio-socks5",

swap/Cargo.toml

@@ -48,6 +48,7 @@ void = "1"
 xmr-btc = { path = "../xmr-btc" }
 
 [dev-dependencies]
+get-port = "3"
 hyper = "0.13"
 port_check = "0.1"
 spectral = "0.6"

swap/tests/happy_path.rs

@@ -1,5 +1,6 @@
 use crate::testutils::{init_alice, init_bob};
 use futures::future::try_join;
+use get_port::get_port;
 use libp2p::Multiaddr;
 use rand::rngs::OsRng;
 use swap::{alice, bob};
@@ -35,8 +36,8 @@ async fn happy_path() {
     let xmr_alice = xmr_to_swap * 10;
     let xmr_bob = xmr_btc::monero::Amount::ZERO;
 
-    // todo: This should not be hardcoded
+    let port = get_port().expect("Failed to find a free port");
-    let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9876"
+    let alice_multiaddr: Multiaddr = format!("/ip4/127.0.0.1/tcp/{}", port)
         .parse()
         .expect("failed to parse Alice's address");
 

swap/tests/happy_path_restart_alice.rs

@@ -1,17 +1,17 @@
+use crate::testutils::{init_alice, init_bob};
+use get_port::get_port;
 use libp2p::Multiaddr;
 use rand::rngs::OsRng;
+use std::convert::TryFrom;
 use swap::{alice, alice::swap::AliceState, bitcoin, bob, storage::Database};
 use tempfile::tempdir;
 use testcontainers::clients::Cli;
+use testutils::init_tracing;
 use uuid::Uuid;
 use xmr_btc::config::Config;
 
 pub mod testutils;
 
-use crate::testutils::{init_alice, init_bob};
-use std::convert::TryFrom;
-use testutils::init_tracing;
-
 #[tokio::test]
 async fn given_alice_restarts_after_encsig_is_learned_resume_swap() {
     let _guard = init_tracing();
@@ -31,7 +31,8 @@ async fn given_alice_restarts_after_encsig_is_learned_resume_swap() {
     let bob_btc_starting_balance = btc_to_swap * 10;
     let alice_xmr_starting_balance = xmr_to_swap * 10;
 
-    let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9877"
+    let port = get_port().expect("Failed to find a free port");
+    let alice_multiaddr: Multiaddr = format!("/ip4/127.0.0.1/tcp/{}", port)
         .parse()
         .expect("failed to parse Alice's address");
 

swap/tests/happy_path_restart_bob.rs

@@ -1,18 +1,17 @@
+use crate::testutils::{init_alice, init_bob};
+use get_port::get_port;
 use libp2p::Multiaddr;
 use rand::rngs::OsRng;
-use swap::{alice, bitcoin, bob, storage::Database};
+use std::convert::TryFrom;
+use swap::{alice, bitcoin, bob, bob::swap::BobState, storage::Database};
 use tempfile::tempdir;
 use testcontainers::clients::Cli;
+use testutils::init_tracing;
 use uuid::Uuid;
 use xmr_btc::config::Config;
 
 pub mod testutils;
 
-use crate::testutils::{init_alice, init_bob};
-use std::convert::TryFrom;
-use swap::bob::swap::BobState;
-use testutils::init_tracing;
-
 #[tokio::test]
 async fn given_bob_restarts_after_encsig_is_sent_resume_swap() {
     let _guard = init_tracing();
@@ -32,7 +31,8 @@ async fn given_bob_restarts_after_encsig_is_sent_resume_swap() {
     let bob_btc_starting_balance = btc_to_swap * 10;
     let alice_xmr_starting_balance = xmr_to_swap * 10;
 
-    let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9877"
+    let port = get_port().expect("Failed to find a free port");
+    let alice_multiaddr: Multiaddr = format!("/ip4/127.0.0.1/tcp/{}", port)
         .parse()
         .expect("failed to parse Alice's address");
 

swap/tests/punish.rs

@@ -1,5 +1,6 @@
 use crate::testutils::{init_alice, init_bob};
 use futures::future::try_join;
+use get_port::get_port;
 use libp2p::Multiaddr;
 use rand::rngs::OsRng;
 use swap::{alice, alice::swap::AliceState, bob, bob::swap::BobState};
@@ -33,8 +34,8 @@ async fn alice_punishes_if_bob_never_acts_after_fund() {
     let alice_btc_starting_balance = bitcoin::Amount::ZERO;
     let alice_xmr_starting_balance = xmr_to_swap * 10;
 
-    // todo: This should not be hardcoded
+    let port = get_port().expect("Failed to find a free port");
-    let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9877"
+    let alice_multiaddr: Multiaddr = format!("/ip4/127.0.0.1/tcp/{}", port)
         .parse()
         .expect("failed to parse Alice's address");
 

swap/tests/refund_restart_alice.rs

@@ -1,5 +1,6 @@
 use crate::testutils::{init_alice, init_bob};
 use futures::future::try_join;
+use get_port::get_port;
 use libp2p::Multiaddr;
 use rand::rngs::OsRng;
 use swap::{alice, alice::swap::AliceState, bob, bob::swap::BobState, storage::Database};
@@ -35,8 +36,8 @@ async fn given_alice_restarts_after_xmr_is_locked_abort_swap() {
     let alice_btc_starting_balance = bitcoin::Amount::ZERO;
     let alice_xmr_starting_balance = xmr_to_swap * 10;
 
-    // todo: This should not be hardcoded
+    let port = get_port().expect("Failed to find a free port");
-    let alice_multiaddr: Multiaddr = "/ip4/127.0.0.1/tcp/9879"
+    let alice_multiaddr: Multiaddr = format!("/ip4/127.0.0.1/tcp/{}", port)
         .parse()
         .expect("failed to parse Alice's address");