refactor: move object list response contracts (#3548)

crates/ecstore/src/store_api/types.rs

@@ -4,6 +4,11 @@ use rustfs_storage_api::{
     VersionMarker, WalkVersionsSortOrder,
 };
 
+pub type ListObjectsInfo = rustfs_storage_api::ListObjectsInfo<ObjectInfo>;
+pub type ListObjectsV2Info = rustfs_storage_api::ListObjectsV2Info<ObjectInfo>;
+pub type ListObjectVersionsInfo = rustfs_storage_api::ListObjectVersionsInfo<ObjectInfo>;
+pub type ObjectInfoOrErr = rustfs_storage_api::ObjectInfoOrErr<ObjectInfo, Error>;
+
 #[derive(Debug, Default, Clone)]
 pub struct ObjectOptions {
     // Use the maximum parity (N/2), used when saving server configuration files
@@ -708,50 +713,6 @@ fn versions_after_marker(file_infos: &rustfs_filemeta::FileInfoVersions, marker:
         .unwrap_or(&file_infos.versions)
 }
 
-#[derive(Debug, Default)]
-pub struct ListObjectsInfo {
-    // Indicates whether the returned list objects response is truncated. A
-    // value of true indicates that the list was truncated. The list can be truncated
-    // if the number of objects exceeds the limit allowed or specified
-    // by max keys.
-    pub is_truncated: bool,
-
-    // When response is truncated (the IsTruncated element value in the response
-    // is true), you can use the key name in this field as marker in the subsequent
-    // request to get next set of objects.
-    pub next_marker: Option<String>,
-
-    // List of objects info for this request.
-    pub objects: Vec<ObjectInfo>,
-
-    // List of prefixes for this request.
-    pub prefixes: Vec<String>,
-}
-
-#[derive(Debug, Default)]
-pub struct ListObjectsV2Info {
-    // Indicates whether the returned list objects response is truncated. A
-    // value of true indicates that the list was truncated. The list can be truncated
-    // if the number of objects exceeds the limit allowed or specified
-    // by max keys.
-    pub is_truncated: bool,
-
-    // When response is truncated (the IsTruncated element value in the response
-    // is true), you can use the key name in this field as marker in the subsequent
-    // request to get next set of objects.
-    //
-    // NOTE: This element is returned only if you have delimiter request parameter
-    // specified.
-    pub continuation_token: Option<String>,
-    pub next_continuation_token: Option<String>,
-
-    // List of objects info for this request.
-    pub objects: Vec<ObjectInfo>,
-
-    // List of prefixes for this request.
-    pub prefixes: Vec<String>,
-}
-
 #[derive(Debug, Default, Clone)]
 pub struct ObjectToDelete {
     pub object_name: String,
@@ -805,15 +766,6 @@ impl DeletedObject {
     }
 }
 
-#[derive(Debug, Default, Clone)]
-pub struct ListObjectVersionsInfo {
-    pub is_truncated: bool,
-    pub next_marker: Option<String>,
-    pub next_version_idmarker: Option<String>,
-    pub objects: Vec<ObjectInfo>,
-    pub prefixes: Vec<String>,
-}
-
 type WalkFilter = fn(&FileInfo) -> bool;
 
 #[derive(Clone, Default)]
@@ -827,12 +779,6 @@ pub struct WalkOptions {
     pub include_free_versions: bool,          // include persisted tier free-version cleanup records
 }
 
-#[derive(Debug)]
-pub struct ObjectInfoOrErr {
-    pub item: Option<ObjectInfo>,
-    pub err: Option<Error>,
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;

crates/storage-api/src/lib.rs

@@ -25,5 +25,6 @@ pub use bucket::{BucketInfo, BucketOperations, BucketOptions, DeleteBucketOption
 pub use error::{StorageErrorCode, StorageResult};
 pub use multipart::{CompletePart, ListMultipartsInfo, ListPartsInfo, MultipartInfo, MultipartUploadResult, PartInfo};
 pub use object::{HTTPPreconditions, HTTPRangeError, HTTPRangeSpec, ObjectLockRetentionOptions};
+pub use object::{ListObjectVersionsInfo, ListObjectsInfo, ListObjectsV2Info, ObjectInfoOrErr};
 pub use object::{ObjectPreconditionError, ObjectPreconditionPart, ObjectPreconditionState};
 pub use object::{VersionMarker, WalkVersionsSortOrder};

crates/storage-api/src/object.rs

@@ -154,6 +154,38 @@ pub enum WalkVersionsSortOrder {
     Descending,
 }
 
+#[derive(Debug, Default)]
+pub struct ListObjectsInfo<ObjectItem> {
+    pub is_truncated: bool,
+    pub next_marker: Option<String>,
+    pub objects: Vec<ObjectItem>,
+    pub prefixes: Vec<String>,
+}
+
+#[derive(Debug, Default)]
+pub struct ListObjectsV2Info<ObjectItem> {
+    pub is_truncated: bool,
+    pub continuation_token: Option<String>,
+    pub next_continuation_token: Option<String>,
+    pub objects: Vec<ObjectItem>,
+    pub prefixes: Vec<String>,
+}
+
+#[derive(Debug, Default, Clone)]
+pub struct ListObjectVersionsInfo<ObjectItem> {
+    pub is_truncated: bool,
+    pub next_marker: Option<String>,
+    pub next_version_idmarker: Option<String>,
+    pub objects: Vec<ObjectItem>,
+    pub prefixes: Vec<String>,
+}
+
+#[derive(Debug)]
+pub struct ObjectInfoOrErr<ObjectItem, ListError> {
+    pub item: Option<ObjectItem>,
+    pub err: Option<ListError>,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum HTTPRangeError {
     InvalidRangeSpec(String),
@@ -386,6 +418,40 @@ mod tests {
         assert!(matches!(WalkVersionsSortOrder::default(), WalkVersionsSortOrder::Ascending));
     }
 
+    #[test]
+    fn object_list_response_contracts_default_to_empty_collections() {
+        let v1 = ListObjectsInfo::<()>::default();
+        assert!(!v1.is_truncated);
+        assert!(v1.next_marker.is_none());
+        assert!(v1.objects.is_empty());
+        assert!(v1.prefixes.is_empty());
+
+        let v2 = ListObjectsV2Info::<()>::default();
+        assert!(!v2.is_truncated);
+        assert!(v2.continuation_token.is_none());
+        assert!(v2.next_continuation_token.is_none());
+        assert!(v2.objects.is_empty());
+        assert!(v2.prefixes.is_empty());
+
+        let versions = ListObjectVersionsInfo::<()>::default();
+        assert!(!versions.is_truncated);
+        assert!(versions.next_marker.is_none());
+        assert!(versions.next_version_idmarker.is_none());
+        assert!(versions.objects.is_empty());
+        assert!(versions.prefixes.is_empty());
+    }
+
+    #[test]
+    fn object_info_or_err_keeps_optional_item_and_error_slots() {
+        let item = ObjectInfoOrErr::<usize, &str> {
+            item: Some(7),
+            err: None,
+        };
+
+        assert_eq!(item.item, Some(7));
+        assert!(item.err.is_none());
+    }
+
     #[test]
     fn http_range_spec_offset_length_handles_suffix_and_bounds() {
         let range = HTTPRangeSpec {

docs/architecture/crate-boundaries.md

@@ -95,6 +95,7 @@ Required `rustfs-storage-api` public re-exports:
 - `pub use error::{StorageErrorCode, StorageResult};`
 - `pub use multipart::{CompletePart, ListMultipartsInfo, ListPartsInfo, MultipartInfo, MultipartUploadResult, PartInfo};`
 - `pub use object::{HTTPPreconditions, HTTPRangeError, HTTPRangeSpec, ObjectLockRetentionOptions};`
+- `pub use object::{ListObjectVersionsInfo, ListObjectsInfo, ListObjectsV2Info, ObjectInfoOrErr};`
 - `pub use object::{ObjectPreconditionError, ObjectPreconditionPart, ObjectPreconditionState};`
 - `pub use object::{VersionMarker, WalkVersionsSortOrder};`
 

docs/architecture/migration-progress.md

@@ -5,18 +5,18 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 ## Current Context
 
 - Issue: [`rustfs/backlog#660`](https://github.com/rustfs/backlog/issues/660)
-- Branch: `overtrue/arch-object-precondition-contracts`
-- Baseline: `overtrue/arch-object-list-helper-contracts` at `65b56e1fb4fa4c65c167e2f434bf5fcb2a0b0cd4f`
-  over `overtrue/arch-range-contracts` at `829bc62095f0fd853747cd6d7d77f8558baf24a2`
+- Branch: `overtrue/arch-list-response-contracts`
+- Baseline: `main` at `80ed63484bf62b916ceda17fd76b1092261fda77`
+  after the object precondition contract merge.
 - PR type for this branch: `api-extraction`
 - Runtime behavior changes: no external behavior change expected.
-- Rust code changes: move pure object HTTP precondition evaluation into
-  `rustfs-storage-api` as `ObjectPreconditionState`,
-  `ObjectPreconditionPart`, and `ObjectPreconditionError`, then keep
-  `ObjectOptions`, `ObjectInfo`, and ECStore error mapping in ECStore.
-- CI/script changes: extend migration guards for object precondition contract
-  public re-exports.
-- Docs changes: record the object precondition contract extraction slice.
+- Rust code changes: move object list response DTO contracts into
+  `rustfs-storage-api` as generic `ListObjectsInfo`,
+  `ListObjectsV2Info`, `ListObjectVersionsInfo`, and `ObjectInfoOrErr`,
+  then keep ECStore's existing public names as `ObjectInfo`/`Error` aliases.
+- CI/script changes: extend migration guards for list response contract public
+  re-exports and ECStore local-definition regressions.
+- Docs changes: record the object list response contract extraction slice.
 
 ## Phase 0 Tasks
 
@@ -619,6 +619,29 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
     checks, migration/layer guards, formatting, diff hygiene, Rust risk scan,
     and required three-expert review passed.
 
+- [x] `API-019` Move object list response contracts.
+  - Completed slice: move `ListObjectsInfo`, `ListObjectsV2Info`,
+    `ListObjectVersionsInfo`, and `ObjectInfoOrErr` from ECStore
+    `store_api/types.rs` into `rustfs-storage-api` as generic public
+    contracts, then keep ECStore's old public names as type aliases bound to
+    `ObjectInfo` and `Error`.
+  - Acceptance: `rustfs-storage-api` exports the generic list response
+    contracts, ECStore no longer defines local response structs for these
+    contracts, existing ECStore consumers keep their old import path, and
+    migration guards reject dropping the public storage-api re-export or
+    reintroducing local ECStore definitions.
+  - Must preserve: list v1/v2 truncation and marker fields, list-object-version
+    marker fields, object/prefix vectors, walk item/error channel shape, and
+    ECStore list/walk runtime behavior.
+  - Risk defense: only generic response containers cross into
+    `rustfs-storage-api`; ECStore keeps `ObjectInfo`, `ObjectOptions`,
+    `WalkOptions`, filemeta filters, object metadata adaptation, storage errors,
+    readers, lifecycle/replication coupling, and list/walk implementation
+    bodies.
+  - Verification: focused storage-api tests, ECStore/RustFS/downstream compile
+    checks, migration/layer guards, formatting, diff hygiene, Rust risk scan,
+    full pre-commit, and required three-expert review passed.
+
 ## Phase 8 Background Controller Tasks
 
 - [x] `BGC-001` Inventory background services.
@@ -895,16 +918,15 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 
 | Expert | Status | Notes |
 |---|---|---|
-| Quality/architecture | passed | Pure precondition decision state and result contracts now live in `rustfs-storage-api`; ECStore still owns object metadata adaptation and storage error mapping. |
-| Migration preservation | passed | Requested-part validation, ETag/date precondition priority, empty condition handling, and existing ECStore `Error` mapping are preserved. |
-| Testing/verification | passed | Focused storage-api/ECStore tests, compile checks, migration/layer guards, formatting, diff hygiene, Rust risk scan, and full `make pre-commit` passed. |
+| Quality/architecture | passed | Generic list response containers now live in `rustfs-storage-api`; ECStore still owns `ObjectInfo`, `Error`, walk options, and list implementation behavior. |
+| Migration preservation | passed | List v1/v2 fields, version-list fields, walk item/error channel shape, and existing ECStore public import paths are preserved through aliases. |
+| Testing/verification | passed | Focused storage-api tests, downstream compile checks, migration/layer guards, formatting, diff hygiene, Rust risk scan, and full `make pre-commit` passed. |
 
 ## Verification Notes
 
 Passed before push:
 
 - `cargo test -p rustfs-storage-api`: passed.
-- `cargo test -p rustfs-ecstore precondition_check_ignores_empty_etag_conditions`: passed.
 - `cargo check --tests -p rustfs-storage-api -p rustfs-ecstore -p rustfs -p rustfs-iam -p rustfs-scanner`: passed.
 - `./scripts/check_architecture_migration_rules.sh`: passed.
 - `./scripts/check_layer_dependencies.sh`: passed.
@@ -913,25 +935,26 @@ Passed before push:
 - Rust risk scan: no new `unwrap`/`expect`, panic/todo markers, `unsafe`,
   process-spawning calls, lossy casts, println/eprintln, or relaxed ordering in
   added Rust lines.
-- `make pre-commit`: passed; nextest reported 6164 tests passed and 111
+- `make pre-commit`: passed; nextest reported 6191 tests passed and 111
   skipped, and doctests passed.
 
 Notes:
 
-- This slice follows the range helper contract branch and keeps the old
+- This slice follows the object precondition contract branch and keeps the old
   aggregate facade, bucket DTO, multipart DTO, bucket operation contract, object
-  helper, range helper, list helper, and object precondition contract guards
-  active.
-- The shared precondition helper contract is now owned by
-  `rustfs-storage-api`; ECStore keeps `ObjectOptions`, `ObjectInfo`, object
-  metadata adaptation, storage error mapping, readers, lifecycle/replication,
-  rio, filemeta, and implementation behavior.
-- The slice does not alter object, list, walk, multipart, bucket, or reader
-  runtime behavior.
+  helper, range helper, list helper, object precondition, and list response
+  contract guards active.
+- The shared list response containers are now owned by `rustfs-storage-api`;
+  ECStore keeps `ObjectInfo`, storage `Error`, `ObjectOptions`, `WalkOptions`,
+  object metadata adaptation, storage error mapping, readers,
+  lifecycle/replication, rio, filemeta, and implementation behavior.
+- The slice does not alter object, list, walk, multipart, bucket, delete, or
+  reader runtime behavior.
 
 ## Handoff Notes
 
-- Object precondition contract cleanup is stacked on the list helper contract
-  branch.
+- Object list response contract cleanup is stacked on the object precondition
+  contract branch.
 - After this lands, remaining storage work can continue by extracting larger
-  low-coupling DTO slices or by narrowing remaining operation-group consumers.
+  low-coupling DTO/consumer slices or by narrowing remaining operation-group
+  consumers.

scripts/check_architecture_migration_rules.sh

@@ -56,6 +56,7 @@ STORE_API_MULTIPART_DTO_REEXPORTS_FILE="${TMP_DIR}/store_api_multipart_dto_reexp
 STORE_API_OBJECT_HELPER_REEXPORTS_FILE="${TMP_DIR}/store_api_object_helper_reexports.txt"
 STORE_API_RANGE_HELPER_REEXPORTS_FILE="${TMP_DIR}/store_api_range_helper_reexports.txt"
 STORE_API_LIST_HELPER_REEXPORTS_FILE="${TMP_DIR}/store_api_list_helper_reexports.txt"
+STORE_API_LIST_RESPONSE_REEXPORTS_FILE="${TMP_DIR}/store_api_list_response_reexports.txt"
 
 awk '
   /^## PR Types$/ {
@@ -196,6 +197,10 @@ require_source_line \
   "crates/storage-api/src/lib.rs" \
   "pub use object::{HTTPPreconditions, HTTPRangeError, HTTPRangeSpec, ObjectLockRetentionOptions};" \
   "storage-api public object helper contract re-export"
+require_source_line \
+  "crates/storage-api/src/lib.rs" \
+  "pub use object::{ListObjectVersionsInfo, ListObjectsInfo, ListObjectsV2Info, ObjectInfoOrErr};" \
+  "storage-api public list response contract re-export"
 require_source_line \
   "crates/storage-api/src/lib.rs" \
   "pub use object::{ObjectPreconditionError, ObjectPreconditionPart, ObjectPreconditionState};" \
@@ -278,6 +283,16 @@ if [[ -s "$STORE_API_LIST_HELPER_REEXPORTS_FILE" ]]; then
   report_failure "old ecstore store_api list helper path reintroduced: $(paste -sd '; ' "$STORE_API_LIST_HELPER_REEXPORTS_FILE")"
 fi
 
+(
+  cd "$ROOT_DIR"
+  rg -n --no-heading 'pub(?:\(crate\))? use rustfs_storage_api(?:::\{[^}]*\b(?:ListObjectVersionsInfo|ListObjectsInfo|ListObjectsV2Info|ObjectInfoOrErr)\b|::(?:ListObjectVersionsInfo|ListObjectsInfo|ListObjectsV2Info|ObjectInfoOrErr)\b)|pub struct (?:ListObjectVersionsInfo|ListObjectsInfo|ListObjectsV2Info|ObjectInfoOrErr)\b' \
+    crates/ecstore/src/store_api.rs crates/ecstore/src/store_api/types.rs || true
+) >"$STORE_API_LIST_RESPONSE_REEXPORTS_FILE"
+
+if [[ -s "$STORE_API_LIST_RESPONSE_REEXPORTS_FILE" ]]; then
+  report_failure "old ecstore store_api list response path reintroduced: $(paste -sd '; ' "$STORE_API_LIST_RESPONSE_REEXPORTS_FILE")"
+fi
+
 require_source_contains \
   "crates/ecstore/src/store_api/traits.rs" \
   "pub trait NamespaceLocking: Send + Sync + Debug + 'static" \