feat(dmq): add a Unix timestamp provider trait

Author: jpraynaud

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

@@ -1,5 +1,7 @@
 mod builder;
 mod message;
+mod timestamp;
 
 pub use builder::*;
 pub use message::*;
+pub use timestamp::*;

internal/mithril-dmq/src/model/timestamp.rs

@@ -0,0 +1,19 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use mithril_common::StdResult;
+
+/// Provides the current timestamp in seconds since the UNIX epoch.
+#[cfg_attr(test, mockall::automock)]
+pub trait UnixTimestampProvider: Send + Sync {
+    /// Returns the current timestamp in seconds since the UNIX epoch.
+    fn current_timestamp(&self) -> StdResult<u64>;
+}
+
+/// Provides the current timestamp in seconds since the UNIX epoch from the system.
+pub struct SystemUnixTimestampProvider;
+
+impl UnixTimestampProvider for SystemUnixTimestampProvider {
+    fn current_timestamp(&self) -> StdResult<u64> {
+        Ok(SystemTime::now().duration_since(UNIX_EPOCH)?.as_secs())
+    }
+}