refactor(core)!: Return Arc<AccessInfo> for metadata

core/src/docs/internals/accessor.rs

@@ -132,7 +132,7 @@
 //!                 ..Default::default()
 //!         });
 //!
-//!         am
+//!         am.into()
 //!     }
 //! }
 //! ```
@@ -302,7 +302,7 @@
 //!                     ..Default::default()
 //!             });
 //!
-//!         am
+//!         am.into()
 //!     }
 //!
 //!     async fn read(&self, path: &str, args: OpRead) -> Result<(RpRead, Self::Reader)> {

core/src/layers/blocking.rs

@@ -15,6 +15,8 @@
 // specific language governing permissions and limitations
 // under the License.
 
+use std::sync::Arc;
+
 use tokio::runtime::Handle;
 
 use crate::raw::*;
@@ -178,10 +180,10 @@ impl<A: Access> LayeredAccess for BlockingAccessor<A> {
         &self.inner
     }
 
-    fn metadata(&self) -> AccessorInfo {
-        let mut meta = self.inner.info();
+    fn metadata(&self) -> Arc<AccessorInfo> {
+        let mut meta = self.inner.info().as_ref().clone();
         meta.full_capability_mut().blocking = true;
-        meta
+        meta.into()
     }
 
     async fn create_dir(&self, path: &str, args: OpCreateDir) -> Result<RpCreateDir> {

core/src/layers/complete.rs

@@ -118,7 +118,7 @@ impl<A: Access> Layer<A> for CompleteLayer {
 
 /// Provide complete wrapper for backend.
 pub struct CompleteAccessor<A: Access> {
-    meta: AccessorInfo,
+    meta: Arc<AccessorInfo>,
     inner: Arc<A>,
 }
 
@@ -380,13 +380,14 @@ impl<A: Access> LayeredAccess for CompleteAccessor<A> {
         &self.inner
     }
 
-    fn metadata(&self) -> AccessorInfo {
-        let mut meta = self.meta.clone();
+    // Todo: May move the logic to the implement of Layer::layer of CompleteAccessor<A>
+    fn metadata(&self) -> Arc<AccessorInfo> {
+        let mut meta = (*self.meta).clone();
         let cap = meta.full_capability_mut();
         if cap.list && cap.write_can_empty {
             cap.create_dir = true;
         }
-        meta
+        meta.into()
     }
 
     async fn create_dir(&self, path: &str, args: OpCreateDir) -> Result<RpCreateDir> {
@@ -731,11 +732,11 @@ mod tests {
         type BlockingWriter = oio::BlockingWriter;
         type BlockingLister = oio::BlockingLister;
 
-        fn info(&self) -> AccessorInfo {
+        fn info(&self) -> Arc<AccessorInfo> {
             let mut info = AccessorInfo::default();
             info.set_native_capability(self.capability);
 
-            info
+            info.into()
         }
 
         async fn create_dir(&self, _: &str, _: OpCreateDir) -> Result<RpCreateDir> {

core/src/layers/error_context.rs

@@ -17,6 +17,7 @@
 
 use std::fmt::Debug;
 use std::fmt::Formatter;
+use std::sync::Arc;
 
 use futures::TryFutureExt;
 
@@ -56,7 +57,7 @@ impl<A: Access> Layer<A> for ErrorContextLayer {
 
 /// Provide error context wrapper for backend.
 pub struct ErrorContextAccessor<A: Access> {
-    meta: AccessorInfo,
+    meta: Arc<AccessorInfo>,
     inner: A,
 }
 
@@ -79,7 +80,7 @@ impl<A: Access> LayeredAccess for ErrorContextAccessor<A> {
         &self.inner
     }
 
-    fn metadata(&self) -> AccessorInfo {
+    fn metadata(&self) -> Arc<AccessorInfo> {
         self.meta.clone()
     }
 

core/src/layers/immutable_index.rs

@@ -17,6 +17,7 @@
 
 use std::collections::HashSet;
 use std::fmt::Debug;
+use std::sync::Arc;
 use std::vec::IntoIter;
 
 use crate::raw::*;
@@ -145,14 +146,14 @@ impl<A: Access> LayeredAccess for ImmutableIndexAccessor<A> {
     }
 
     /// Add list capabilities for underlying storage services.
-    fn metadata(&self) -> AccessorInfo {
-        let mut meta = self.inner.info();
+    fn metadata(&self) -> Arc<AccessorInfo> {
+        let mut meta = (*self.inner.info()).clone();
 
         let cap = meta.full_capability_mut();
         cap.list = true;
         cap.list_with_recursive = true;
 
-        meta
+        meta.into()
     }
 
     async fn read(&self, path: &str, args: OpRead) -> Result<(RpRead, Self::Reader)> {

core/src/layers/logging.rs

@@ -18,6 +18,7 @@
 use std::fmt::Debug;
 use std::sync::atomic::AtomicU64;
 use std::sync::atomic::Ordering;
+use std::sync::Arc;
 
 use bytes::Buf;
 use futures::FutureExt;
@@ -221,7 +222,7 @@ impl<A: Access> LayeredAccess for LoggingAccessor<A> {
         &self.inner
     }
 
-    fn metadata(&self) -> AccessorInfo {
+    fn metadata(&self) -> Arc<AccessorInfo> {
         debug!(
             target: LOGGING_TARGET,
             "service={} operation={} -> started",

core/src/layers/metrics.rs

@@ -414,7 +414,7 @@ impl<A: Access> LayeredAccess for MetricsAccessor<A> {
         &self.inner
     }
 
-    fn metadata(&self) -> AccessorInfo {
+    fn metadata(&self) -> Arc<AccessorInfo> {
         self.handle.requests_total_metadata.increment(1);
 
         let start = Instant::now();

core/src/layers/minitrace.rs

@@ -17,6 +17,7 @@
 
 use std::fmt::Debug;
 use std::future::Future;
+use std::sync::Arc;
 
 use futures::FutureExt;
 use minitrace::prelude::*;
@@ -139,7 +140,7 @@ impl<A: Access> LayeredAccess for MinitraceAccessor<A> {
     }
 
     #[trace]
-    fn metadata(&self) -> AccessorInfo {
+    fn metadata(&self) -> Arc<AccessorInfo> {
         self.inner.info()
     }
 

core/src/layers/oteltrace.rs

@@ -16,6 +16,7 @@
 // under the License.
 
 use std::future::Future;
+use std::sync::Arc;
 
 use futures::FutureExt;
 use opentelemetry::global;
@@ -75,7 +76,7 @@ impl<A: Access> LayeredAccess for OtelTraceAccessor<A> {
         &self.inner
     }
 
-    fn metadata(&self) -> AccessorInfo {
+    fn metadata(&self) -> Arc<AccessorInfo> {
         let tracer = global::tracer("opendal");
         tracer.in_span("metadata", |_cx| self.inner.info())
     }

core/src/layers/retry.rs

@@ -800,7 +800,7 @@ mod tests {
         type BlockingWriter = ();
         type BlockingLister = ();
 
-        fn info(&self) -> AccessorInfo {
+        fn info(&self) -> Arc<AccessorInfo> {
             let mut am = AccessorInfo::default();
             am.set_native_capability(Capability {
                 read: true,
@@ -813,7 +813,7 @@ mod tests {
                 ..Default::default()
             });
 
-            am
+            am.into()
         }
 
         async fn stat(&self, _: &str, _: OpStat) -> Result<RpStat> {

core/src/layers/timeout.rs

@@ -400,15 +400,15 @@ mod tests {
         type BlockingWriter = ();
         type BlockingLister = ();
 
-        fn info(&self) -> AccessorInfo {
+        fn info(&self) -> Arc<AccessorInfo> {
             let mut am = AccessorInfo::default();
             am.set_native_capability(Capability {
                 read: true,
                 delete: true,
                 ..Default::default()
             });
 
-            am
+            am.into()
         }
 
         /// This function will build a reader that always return pending.

core/src/layers/tracing.rs

@@ -17,6 +17,7 @@
 
 use std::fmt::Debug;
 use std::future::Future;
+use std::sync::Arc;
 
 use futures::FutureExt;
 use tracing::Span;
@@ -140,7 +141,7 @@ impl<A: Access> LayeredAccess for TracingAccessor<A> {
     }
 
     #[tracing::instrument(level = "debug")]
-    fn metadata(&self) -> AccessorInfo {
+    fn metadata(&self) -> Arc<AccessorInfo> {
         self.inner.info()
     }
 

core/src/raw/accessor.rs

@@ -80,7 +80,7 @@ pub trait Access: Send + Sync + Debug + Unpin + 'static {
     ///
     /// - scheme: declare the scheme of backend.
     /// - capabilities: declare the capabilities of current backend.
-    fn info(&self) -> AccessorInfo;
+    fn info(&self) -> Arc<AccessorInfo>;
 
     /// Invoke the `create` operation on the specified path
     ///
@@ -399,7 +399,7 @@ pub trait Access: Send + Sync + Debug + Unpin + 'static {
 /// `Box<dyn AccessDyn>`.
 pub trait AccessDyn: Send + Sync + Debug + Unpin {
     /// Dyn version of [`Accessor::info`]
-    fn info_dyn(&self) -> AccessorInfo;
+    fn info_dyn(&self) -> Arc<AccessorInfo>;
     /// Dyn version of [`Accessor::create_dir`]
     fn create_dir_dyn<'a>(
         &'a self,
@@ -484,7 +484,7 @@ where
         BlockingLister = oio::BlockingLister,
     >,
 {
-    fn info_dyn(&self) -> AccessorInfo {
+    fn info_dyn(&self) -> Arc<AccessorInfo> {
         self.info()
     }
 
@@ -607,7 +607,7 @@ impl Access for dyn AccessDyn {
     type Lister = oio::Lister;
     type BlockingLister = oio::BlockingLister;
 
-    fn info(&self) -> AccessorInfo {
+    fn info(&self) -> Arc<AccessorInfo> {
         self.info_dyn()
     }
 
@@ -693,14 +693,15 @@ impl Access for () {
     type BlockingWriter = ();
     type BlockingLister = ();
 
-    fn info(&self) -> AccessorInfo {
+    fn info(&self) -> Arc<AccessorInfo> {
         AccessorInfo {
             scheme: Scheme::Custom("dummy"),
             root: "".to_string(),
             name: "dummy".to_string(),
             native_capability: Capability::default(),
             full_capability: Capability::default(),
         }
+        .into()
     }
 }
 
@@ -717,7 +718,7 @@ impl<T: Access + ?Sized> Access for Arc<T> {
     type BlockingWriter = T::BlockingWriter;
     type BlockingLister = T::BlockingLister;
 
-    fn info(&self) -> AccessorInfo {
+    fn info(&self) -> Arc<AccessorInfo> {
         self.as_ref().info()
     }
 

core/src/raw/adapters/kv/backend.rs

@@ -64,7 +64,7 @@ impl<S: Adapter> Access for Backend<S> {
     type Lister = HierarchyLister<KvLister>;
     type BlockingLister = HierarchyLister<KvLister>;
 
-    fn info(&self) -> AccessorInfo {
+    fn info(&self) -> Arc<AccessorInfo> {
         let mut am: AccessorInfo = self.kv.metadata().into();
         am.set_root(&self.root);
 
@@ -84,7 +84,7 @@ impl<S: Adapter> Access for Backend<S> {
 
         am.set_native_capability(cap);
 
-        am
+        am.into()
     }
 
     async fn read(&self, path: &str, args: OpRead) -> Result<(RpRead, Self::Reader)> {

core/src/raw/adapters/typed_kv/backend.rs

@@ -59,7 +59,7 @@ impl<S: Adapter> Access for Backend<S> {
     type Lister = HierarchyLister<KvLister>;
     type BlockingLister = HierarchyLister<KvLister>;
 
-    fn info(&self) -> AccessorInfo {
+    fn info(&self) -> Arc<AccessorInfo> {
         let kv_info = self.kv.info();
         let mut am: AccessorInfo = AccessorInfo::default();
         am.set_root(&self.root);
@@ -91,7 +91,7 @@ impl<S: Adapter> Access for Backend<S> {
 
         am.set_native_capability(cap);
 
-        am
+        am.into()
     }
 
     async fn read(&self, path: &str, args: OpRead) -> Result<(RpRead, Self::Reader)> {

core/src/raw/layer.rs

@@ -16,6 +16,7 @@
 // under the License.
 
 use std::fmt::Debug;
+use std::sync::Arc;
 
 use futures::Future;
 
@@ -139,7 +140,7 @@ pub trait LayeredAccess: Send + Sync + Debug + Unpin + 'static {
 
     fn inner(&self) -> &Self::Inner;
 
-    fn metadata(&self) -> AccessorInfo {
+    fn metadata(&self) -> Arc<AccessorInfo> {
         self.inner().info()
     }
 
@@ -246,7 +247,7 @@ impl<L: LayeredAccess> Access for L {
     type Lister = L::Lister;
     type BlockingLister = L::BlockingLister;
 
-    fn info(&self) -> AccessorInfo {
+    fn info(&self) -> Arc<AccessorInfo> {
         (self as &L).metadata()
     }
 
@@ -358,10 +359,10 @@ mod tests {
         type Lister = ();
         type BlockingLister = ();
 
-        fn info(&self) -> AccessorInfo {
+        fn info(&self) -> Arc<AccessorInfo> {
             let mut am = AccessorInfo::default();
             am.set_scheme(Scheme::Custom("test"));
-            am
+            am.into()
         }
 
         async fn delete(&self, _: &str, _: OpDelete) -> Result<RpDelete> {