refactor(admin): use storage admin reads (#3334)

docs/architecture/migration-progress.md

@@ -5,15 +5,15 @@ 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-admin-usecase-storage-info`
-- Baseline: `origin/main` at `8a90bda16ab233504ee2c4f9e15942c340d54631`
+- Branch: `overtrue/arch-admin-readiness-storage-admin`
+- Baseline: `origin/main` at `b48d7b1fa514e5da274d652a0cb7f282521f46c0`
 - PR type for this branch: `consumer-migration`
 - Runtime behavior changes: none.
-- Rust code changes: migrate the admin use-case storage-info consumer from the
-  old `StorageAPI::storage_info` trait import to the inventory-facing
-  `StorageAdminApi::storage_info` contract.
-- CI/script changes: none
-- Docs changes: record API-007 admin use-case consumer-migration context,
+- Rust code changes: migrate grouped admin/readiness read-side consumers from
+  old `StorageAPI::{backend_info, storage_info}` trait imports to the
+  inventory-facing `StorageAdminApi` contract.
+- CI/script changes: none.
+- Docs changes: record API-007 grouped consumer-migration context,
   verification evidence, and expert review outcomes.
 
 ## Phase 0 Tasks
@@ -198,17 +198,21 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
   - Completed second slice: `rustfs/rustfs#3332` migrated the admin
     storage-class config drive-count consumer to
     `StorageAdminApi::set_drive_counts`.
-  - Current branch slice: migrate the admin use-case storage-info consumer to
+  - Completed third slice: `rustfs/rustfs#3333` migrated
+    `DefaultAdminUsecase` storage-info reads to
     `StorageAdminApi::storage_info`.
-  - Acceptance: `rustfs/src/app/admin_usecase.rs` no longer imports old
-    `StorageAPI` only to read admin storage information.
+  - Current branch slice: migrate grouped read-side admin/readiness consumers:
+    account-info `backend_info`, rebalance status `storage_info`, and runtime
+    readiness `storage_info`.
+  - Acceptance: account-info, rebalance status, and readiness no longer import
+    old `StorageAPI` only to read admin storage information.
   - Must preserve: old `StorageAPI` trait shape, `StorageAPI::get_disks`
-    behavior, admin storage-info response shape, data-usage capacity
-    correction semantics, readiness/heal/scanner/RPC consumers, and storage hot
-    paths.
-  - Risk defense: keep this slice to `DefaultAdminUsecase` storage-info reads;
-    do not migrate account-info `backend_info`, RPC `local_storage_info`,
-    readiness, heal, scanner, or storage hot-path consumers in the same PR.
+    behavior, account-info response shape, rebalance used-space aggregation,
+    readiness degraded-state semantics, RPC `local_storage_info`, heal/scanner
+    consumers, and storage hot paths.
+  - Risk defense: group only read-side callers that delegate to the existing
+    ECStore admin info implementation; do not migrate RPC `local_storage_info`,
+    heal, scanner, observability, or storage hot-path consumers in this PR.
 
 ## Phase 8 Background Controller Tasks
 
@@ -252,39 +256,40 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 
 | Expert | Status | Notes |
 |---|---|---|
-| Quality/architecture | pass | Confirmed this remains a narrow admin use-case storage-info consumer-migration slice, with no ECStore, `StorageAPI`, storage-api, manifest, or lockfile boundary reshaping. |
-| Migration preservation | pass | Confirmed admin storage-info response shape, capacity correction semantics, old `StorageAPI`, `StorageAPI::get_disks`, ECStore handlers, and storage hot paths remain unchanged. |
-| Testing/verification | pass | Confirmed focused admin use-case tests, migration guards, formatting, diff hygiene, and full pre-commit evidence passed before push. |
+| Quality/architecture | pass | Confirmed the diff stays limited to three read-side consumers and migration notes, with no manifest, ECStore, storage-api, RPC, heal, scanner, observability, or hot-path scope creep. |
+| Migration preservation | pass | Confirmed the new and old ECStore trait paths still delegate to the same backend/storage-info handlers, while account-info response construction, rebalance aggregation, and readiness cache/degraded-state logic remain unchanged. |
+| Testing/verification | pass | Confirmed touched-consumer focused tests, compile checks, migration guards, diff hygiene, and full pre-commit evidence are sufficient; no missing success-path integration test is a blocker for this call-path migration. |
 
 ## Verification Notes
 
 Passed:
-- `cargo fmt --all --check`
-- `cargo check -p rustfs --lib`
-- `cargo test -p rustfs app::admin_usecase --lib`
-- `cargo check -p rustfs-storage-api -p rustfs-ecstore -p rustfs --lib`
-- `./scripts/check_architecture_migration_rules.sh`
-- `./scripts/check_layer_dependencies.sh`
-- `./scripts/check_metrics_migration_refs.sh`
-- `./scripts/check_unsafe_code_allowances.sh`
-- `git diff --check`
-- `make NUM_CORES=1 pre-commit`
+- `cargo fmt --all --check`.
+- `cargo check -p rustfs --lib`.
+- `cargo test -p rustfs admin::handlers::account_info --lib`; 3 passed.
+- `cargo test -p rustfs admin::handlers::rebalance --lib`; 19 passed.
+- `cargo test -p rustfs server::readiness --lib`; 13 passed.
+- `cargo check -p rustfs-storage-api -p rustfs-ecstore -p rustfs --lib`.
+- `./scripts/check_architecture_migration_rules.sh`.
+- `./scripts/check_layer_dependencies.sh`.
+- `./scripts/check_metrics_migration_refs.sh`.
+- `./scripts/check_unsafe_code_allowances.sh`.
+- `git diff --check`.
+- `make NUM_CORES=1 pre-commit`.
 
 Notes:
 - This branch relies on the existing direct `rustfs` dependency on
-  `rustfs-storage-api` from the previous API-007 slice.
-- Only `DefaultAdminUsecase` storage-info read calls changed.
-- No existing ECStore handler, admin route, readiness path, heal/scanner
-  consumer, RPC consumer, or storage hot path is changed.
+  `rustfs-storage-api` from earlier API-007 slices.
+- No ECStore handler, old `StorageAPI` trait, RPC consumer, heal/scanner
+  consumer, observability consumer, or storage hot path is changed.
 - Full pre-commit passed with nextest `5757 passed, 111 skipped`; workspace
   doctests passed.
 - No temporary compatibility shim was added.
 
 ## Handoff Notes
 
-- Keep this API-007 slice as a focused `consumer-migration` PR.
-- Do not migrate account-info `backend_info`, RPC `local_storage_info`,
-  readiness, heal, scanner, or storage hot-path consumers in this PR.
+- Keep this API-007 slice as a grouped read-side `consumer-migration` PR.
+- Do not migrate RPC `local_storage_info`, heal, scanner, observability, or
+  storage hot-path consumers in this PR.
 - Do not remove or route around `StorageAPI::get_disks` in this PR.
 - Do not make the old `StorageAPI` trait inherit `StorageAdminApi` in this PR.
 - Do not add temporary compatibility code unless a matching

rustfs/src/admin/handlers/account_info.rs

@@ -22,10 +22,11 @@ use matchit::Params;
 use rustfs_credentials::get_global_action_cred;
 use rustfs_ecstore::bucket::versioning_sys::BucketVersioningSys;
 use rustfs_ecstore::new_object_layer_fn;
-use rustfs_ecstore::store_api::{BucketOperations, BucketOptions, StorageAPI};
+use rustfs_ecstore::store_api::{BucketOperations, BucketOptions};
 use rustfs_policy::policy::BucketPolicy;
 use rustfs_policy::policy::default::DEFAULT_POLICIES;
 use rustfs_policy::policy::{Args, action::Action, action::S3Action};
+use rustfs_storage_api::StorageAdminApi;
 use s3s::header::CONTENT_TYPE;
 use s3s::{Body, S3Error, S3ErrorCode, S3Request, S3Response, S3Result, s3_error};
 use serde::Serialize;
@@ -187,7 +188,7 @@ impl Operation for AccountInfoHandler {
 
         let mut account_info = rustfs_madmin::AccountInfo {
             account_name,
-            server: store.backend_info().await,
+            server: StorageAdminApi::backend_info(store.as_ref()).await,
             policy: serde_json::Value::String(policy_str),
             ..Default::default()
         };

rustfs/src/admin/handlers/rebalance.rs

@@ -25,7 +25,6 @@ use hyper::Method;
 use matchit::Params;
 use rustfs_ecstore::rebalance::RebalanceMeta;
 use rustfs_ecstore::{
-    StorageAPI,
     error::StorageError,
     new_object_layer_fn,
     notification_sys::get_global_notification_sys,
@@ -34,6 +33,7 @@ use rustfs_ecstore::{
     store_api::BucketOptions,
 };
 use rustfs_policy::policy::action::{Action, AdminAction};
+use rustfs_storage_api::StorageAdminApi;
 use s3s::{
     Body, S3Request, S3Response, S3Result,
     header::{CONTENT_LENGTH, CONTENT_TYPE},
@@ -347,7 +347,7 @@ impl Operation for RebalanceStatus {
         }
 
         // Compute disk usage percentage
-        let si = store.storage_info().await;
+        let si = StorageAdminApi::storage_info(store.as_ref()).await;
         let mut disk_stats = vec![DiskStat::default(); store.pools.len()];
 
         for disk in si.disks.iter() {

rustfs/src/server/readiness.rs

@@ -24,9 +24,9 @@ use rustfs_common::GlobalReadiness;
 use rustfs_ecstore::global::is_dist_erasure;
 use rustfs_ecstore::global::{get_global_endpoints_opt, get_global_lock_clients};
 use rustfs_ecstore::new_object_layer_fn;
-use rustfs_ecstore::store_api::StorageAPI;
 use rustfs_iam::get_global_iam_sys;
 use rustfs_madmin::{Disk, StorageInfo};
+use rustfs_storage_api::StorageAdminApi;
 use std::future::Future;
 use std::pin::Pin;
 use std::sync::Arc;
@@ -489,7 +489,7 @@ async fn collect_dependency_readiness_uncached() -> DependencyReadiness {
 
 async fn collect_storage_readiness_uncached() -> bool {
     if let Some(store) = new_object_layer_fn() {
-        let storage_info = store.storage_info().await;
+        let storage_info = StorageAdminApi::storage_info(store.as_ref()).await;
         storage_ready_from_runtime_state(&storage_info)
     } else {
         false