feat(service/dashmap): scan op

Signed-off-by: suyanhanx <[email protected]>

src/services/dashmap/backend.rs

@@ -66,7 +66,7 @@ impl kv::Adapter for Adapter {
         kv::Metadata::new(
             Scheme::Dashmap,
             &format!("{:?}", &self.inner as *const _),
-            AccessorCapability::Read | AccessorCapability::Write,
+            AccessorCapability::Read | AccessorCapability::Write | AccessorCapability::Scan,
         )
     }
 
@@ -100,6 +100,19 @@ impl kv::Adapter for Adapter {
 
         Ok(())
     }
+
+    async fn scan(&self, path: &str) -> Result<Vec<String>> {
+        self.blocking_scan(path)
+    }
+
+    fn blocking_scan(&self, path: &str) -> Result<Vec<String>> {
+        let keys = self.inner.iter().map(|kv| kv.key().to_string());
+        if path.is_empty() {
+            Ok(keys.collect())
+        } else {
+            Ok(keys.filter(|k| k.starts_with(path)).collect())
+        }
+    }
 }
 
 #[cfg(test)]