feat(dmq): add 'DmqPublisherServer' trait

Author: jpraynaud

internal/mithril-dmq/src/publisher/mod.rs

@@ -1,3 +1,5 @@
 mod client;
+mod server;
 
 pub use client::*;
+pub use server::*;

internal/mithril-dmq/src/publisher/server/interface.rs

@@ -0,0 +1,12 @@
+use mithril_common::StdResult;
+
+/// Trait for the server side of publishing messages from a DMQ node.
+#[cfg_attr(test, mockall::automock)]
+#[async_trait::async_trait]
+pub trait DmqPublisherServer: Send + Sync {
+    /// Processes the next message received from the DMQ client.
+    async fn process_message(&self) -> StdResult<()>;
+
+    /// Runs the DMQ publisher server.
+    async fn run(&self) -> StdResult<()>;
+}

internal/mithril-dmq/src/publisher/server/mod.rs

@@ -0,0 +1,3 @@
+mod interface;
+
+pub use interface::*;