[PATCH proxmox-backup v2 39/43] api: datastore: expose max/default retention timespans in status listing

[Christian Ebner <c.ebner@proxmox.com>]

Expose max-retention-timespan and default-retention-timespan in
datastore status list items of /admin/datastore/{store}/status.
Set the default retention timespan also on the datastore instance when
parsed from the config and add the helper to access it.

This will allow client to fetch this information in order to generate
retention timestamps compatible with the datastore limits/defaults as
well as backup/sync jobs to gather the default where needed.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
 pbs-datastore/src/datastore.rs | 8 ++++++++
 src/api2/admin/datastore.rs    | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index 8fa6959f5..faf5a0410 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -214,6 +214,7 @@ pub struct DataStoreImpl {
     thresholds_exceeded_callback: Option<ThresholdsExceededCallback>,
     max_snapshot_time_skew: i64,
     max_retention_timespan: Option<RetentionTimespan>,
+    default_retention_timespan: Option<RetentionTimespan>,
 }
 
 impl DataStoreImpl {
@@ -234,6 +235,7 @@ impl DataStoreImpl {
             thresholds_exceeded_callback: None,
             max_snapshot_time_skew: i64::try_from(DEFAULT_SNAPSHOT_TIME_SKEW_SECS).unwrap(),
             max_retention_timespan: None,
+            default_retention_timespan: None,
         })
     }
 }
@@ -817,6 +819,7 @@ impl DataStore {
             thresholds_exceeded_callback,
             max_snapshot_time_skew,
             max_retention_timespan: config.max_retention_timespan,
+            default_retention_timespan: config.default_retention_timespan,
         })
     }
 
@@ -862,6 +865,11 @@ impl DataStore {
         Ok(())
     }
 
+    /// Return the configured default retention timespan
+    pub fn default_retention_timespan(&self) -> Option<&RetentionTimespan> {
+        self.inner.default_retention_timespan.as_ref()
+    }
+
     /// Return the configured maximum retention timespan
     pub fn max_retention_timespan(&self) -> Option<&RetentionTimespan> {
         self.inner.max_retention_timespan.as_ref()
diff --git a/src/api2/admin/datastore.rs b/src/api2/admin/datastore.rs
index 563590430..186e43eb7 100644
--- a/src/api2/admin/datastore.rs
+++ b/src/api2/admin/datastore.rs
@@ -732,8 +732,8 @@ pub async fn status(
         counts,
         backend_type,
         s3_statistics,
-        default_retention_timespan: None,
-        max_retention_timespan: None,
+        max_retention_timespan: datastore.max_retention_timespan().cloned(),
+        default_retention_timespan: datastore.default_retention_timespan().cloned(),
     })
 }
 
-- 
2.47.3