feat: allow sent messages seen as subscribed (#1520)

* feat: allow sent messages seen as subscribed

minor feature to allow mimicing the behaviour expected by ipfs api tests.

* refactor: rename per review comments

* refactor: rename Floodsub::options to config

* chore: update changelog

* Update CHANGELOG.md

Co-Authored-By: Max Inden <mail@max-inden.de>

Co-authored-by: Max Inden <mail@max-inden.de>
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>

CHANGELOG.md

@@ -1,5 +1,7 @@
 # Version ???
 
+- `libp2p-floodsub`: Allow sent messages seen as subscribed.
+  [PR 1520](https://github.com/libp2p/rust-libp2p/pull/1520)
 
 # Version 0.17.0 (2020-04-02)
 

protocols/floodsub/src/layer.rs

@@ -18,8 +18,9 @@
 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
-use crate::protocol::{FloodsubConfig, FloodsubMessage, FloodsubRpc, FloodsubSubscription, FloodsubSubscriptionAction};
+use crate::protocol::{FloodsubProtocol, FloodsubMessage, FloodsubRpc, FloodsubSubscription, FloodsubSubscriptionAction};
 use crate::topic::Topic;
+use crate::FloodsubConfig;
 use cuckoofilter::CuckooFilter;
 use fnv::FnvHashSet;
 use libp2p_core::{Multiaddr, PeerId, connection::ConnectionId};
@@ -43,8 +44,7 @@ pub struct Floodsub {
     /// Events that need to be yielded to the outside when polling.
     events: VecDeque<NetworkBehaviourAction<FloodsubRpc, FloodsubEvent>>,
 
-    /// Peer id of the local node. Used for the source of the messages that we publish.
-    local_peer_id: PeerId,
+    config: FloodsubConfig,
 
     /// List of peers to send messages to.
     target_peers: FnvHashSet<PeerId>,
@@ -64,11 +64,16 @@ pub struct Floodsub {
 }
 
 impl Floodsub {
-    /// Creates a `Floodsub`.
+    /// Creates a `Floodsub` with default configuration.
     pub fn new(local_peer_id: PeerId) -> Self {
+        Self::from_config(FloodsubConfig::new(local_peer_id))
+    }
+
+    /// Creates a `Floodsub` with the given configuration.
+    pub fn from_config(config: FloodsubConfig) -> Self {
         Floodsub {
             events: VecDeque::new(),
-            local_peer_id,
+            config,
             target_peers: FnvHashSet::default(),
             connected_peers: HashMap::new(),
             subscribed_topics: SmallVec::new(),
@@ -190,7 +195,7 @@ impl Floodsub {
 
     fn publish_many_inner(&mut self, topic: impl IntoIterator<Item = impl Into<Topic>>, data: impl Into<Vec<u8>>, check_self_subscriptions: bool) {
         let message = FloodsubMessage {
-            source: self.local_peer_id.clone(),
+            source: self.config.local_peer_id.clone(),
             data: data.into(),
             // If the sequence numbers are predictable, then an attacker could flood the network
             // with packets with the predetermined sequence numbers and absorb our legitimate
@@ -202,6 +207,10 @@ impl Floodsub {
         let self_subscribed = self.subscribed_topics.iter().any(|t| message.topics.iter().any(|u| t == u));
         if self_subscribed {
             self.received.add(&message);
+            if self.config.subscribe_local_messages {
+                self.events.push_back(
+                    NetworkBehaviourAction::GenerateEvent(FloodsubEvent::Message(message.clone())));
+            }
         }
         // Don't publish the message if we have to check subscriptions
         // and we're not subscribed ourselves to any of the topics.
@@ -228,7 +237,7 @@ impl Floodsub {
 }
 
 impl NetworkBehaviour for Floodsub {
-    type ProtocolsHandler = OneShotHandler<FloodsubConfig, FloodsubRpc, InnerMessage>;
+    type ProtocolsHandler = OneShotHandler<FloodsubProtocol, FloodsubRpc, InnerMessage>;
     type OutEvent = FloodsubEvent;
 
     fn new_handler(&mut self) -> Self::ProtocolsHandler {

protocols/floodsub/src/lib.rs

@@ -21,6 +21,8 @@
 //! Implements the floodsub protocol, see also the:
 //! [spec](https://github.com/libp2p/specs/tree/master/pubsub).
 
+use libp2p_core::PeerId;
+
 pub mod protocol;
 
 mod layer;
@@ -33,3 +35,22 @@ mod rpc_proto {
 pub use self::layer::{Floodsub, FloodsubEvent};
 pub use self::protocol::{FloodsubMessage, FloodsubRpc};
 pub use self::topic::Topic;
+
+/// Configuration options for the Floodsub protocol.
+pub struct FloodsubConfig {
+    /// Peer id of the local node. Used for the source of the messages that we publish.
+    pub local_peer_id: PeerId,
+
+    /// `true` if messages published by local node should be propagated as messages received from
+    /// the network, `false` by default.
+    pub subscribe_local_messages: bool,
+}
+
+impl FloodsubConfig {
+    pub fn new(local_peer_id: PeerId) -> Self {
+        Self {
+            local_peer_id,
+            subscribe_local_messages: false
+        }
+    }
+}

protocols/floodsub/src/protocol.rs

@@ -27,16 +27,16 @@ use futures::{Future, io::{AsyncRead, AsyncWrite}};
 
 /// Implementation of `ConnectionUpgrade` for the floodsub protocol.
 #[derive(Debug, Clone, Default)]
-pub struct FloodsubConfig {}
+pub struct FloodsubProtocol {}
 
-impl FloodsubConfig {
-    /// Builds a new `FloodsubConfig`.
-    pub fn new() -> FloodsubConfig {
-        FloodsubConfig {}
+impl FloodsubProtocol {
+    /// Builds a new `FloodsubProtocol`.
+    pub fn new() -> FloodsubProtocol {
+        FloodsubProtocol {}
     }
 }
 
-impl UpgradeInfo for FloodsubConfig {
+impl UpgradeInfo for FloodsubProtocol {
     type Info = &'static [u8];
     type InfoIter = iter::Once<Self::Info>;
 
@@ -45,7 +45,7 @@ impl UpgradeInfo for FloodsubConfig {
     }
 }
 
-impl<TSocket> InboundUpgrade<TSocket> for FloodsubConfig
+impl<TSocket> InboundUpgrade<TSocket> for FloodsubProtocol
 where
     TSocket: AsyncRead + AsyncWrite + Send + Unpin + 'static,
 {