network-libp2p: Expose a configuration for the desired number of peers

Expose a configuration for the desired number of peers for the
connection pool to realize when to try to connect to more peers.
This configuration is exposed in the network and is set in the client
to be `consensus.min_peers`.

lib/src/client.rs

@@ -298,6 +298,7 @@ impl ClientInner {
  false,
  required_services,
  tls_config,
+ config.consensus.min_peers,
  );
 
  log::debug!(

network-libp2p/src/behaviour.rs

@@ -91,6 +91,7 @@ impl Behaviour {
  peer_id,
  config.seeds,
  config.discovery.required_services,
+ config.peer_count_desired,
  );
 
  // Request Response behaviour

network-libp2p/src/config.rs

@@ -30,6 +30,7 @@ pub struct Config {
  pub memory_transport: bool,
  pub required_services: Services,
  pub tls: Option<TlsConfig>,
+ pub peer_count_desired: usize,
 }
 
 impl Config {
@@ -41,6 +42,7 @@ impl Config {
  memory_transport: bool,
  required_services: Services,
  tls_settings: Option<TlsConfig>,
+ peer_count_desired: usize,
  ) -> Self {
  // Hardcoding the minimum number of peers in mesh network before adding more
  // TODO: Maybe change this to a mesh limits configuration argument of this function
@@ -80,6 +82,7 @@ impl Config {
  memory_transport,
  required_services,
  tls: tls_settings,
+ peer_count_desired,
  }
  }
 }

network-libp2p/src/connection_pool/behaviour.rs

@@ -310,13 +310,15 @@ impl Behaviour {
  own_peer_id: PeerId,
  seeds: Vec<Multiaddr>,
  required_services: Services,
+ peer_count_desired: usize,
  ) -> Self {
  let limits = Limits {
  ip_count: HashMap::new(),
  ip_subnet_count: HashMap::new(),
  peer_count: 0,
  };
- let config = Config::default();
+ let mut config = Config::default();
+ config.peer_count_desired = peer_count_desired;
  let housekeeping_timer = wasm_timer::Interval::new(config.housekeeping_interval);
 
  Self {

network-libp2p/tests/network.rs

@@ -57,6 +57,7 @@ fn network_config(address: Multiaddr) -> Config {
  memory_transport: true,
  required_services: Services::all(),
  tls: None,
+ peer_count_desired: 3,
  }
 }
 

network-libp2p/tests/request_response.rs

@@ -309,6 +309,7 @@ fn network_config(address: Multiaddr) -> Config {
  memory_transport: true,
  required_services: Services::all(),
  tls: None,
+ peer_count_desired: 3,
  }
 }
 

test-utils/src/test_network.rs

@@ -72,6 +72,7 @@ impl TestNetwork for Network {
  true,
  Services::all(),
  None,
+ 3,
  );
  let network = Arc::new(
  Network::new(