api: make expensive parts of datastore status opt-in

used in the PBS GUI, but also for PVE usage queries which don't need all
the extra expensive information..

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

src/api2/admin/datastore.rs

@@ -525,7 +525,14 @@ fn get_snapshots_count(store: &DataStore) -> Result<Counts, Error> {
             store: {
                 schema: DATASTORE_SCHEMA,
             },
+            verbose: {
+                type: bool,
+                default: false,
+                optional: true,
+                description: "Include additional information like snapshot counts and GC status.",
+            },
         },
+
     },
     returns: {
         type: DataStoreStatus,
@@ -537,13 +544,18 @@ fn get_snapshots_count(store: &DataStore) -> Result<Counts, Error> {
 /// Get datastore status.
 pub fn status(
     store: String,
+    verbose: bool,
     _info: &ApiMethod,
     _rpcenv: &mut dyn RpcEnvironment,
 ) -> Result<DataStoreStatus, Error> {
     let datastore = DataStore::lookup_datastore(&store)?;
     let storage = crate::tools::disks::disk_usage(&datastore.base_path())?;
-    let counts = get_snapshots_count(&datastore)?;
-    let gc_status = datastore.last_gc_status();
+    let (counts, gc_status) = match verbose {
+        true => {
+            (Some(get_snapshots_count(&datastore)?), Some(datastore.last_gc_status()))
+        },
+        false => (None, None),
+    };
 
     Ok(DataStoreStatus {
         total: storage.total,

src/api2/types/mod.rs

@@ -707,8 +707,14 @@ pub struct Counts {
 
 #[api(
     properties: {
-        "gc-status": { type: GarbageCollectionStatus, },
-        counts: { type: Counts, }
+        "gc-status": {
+            type: GarbageCollectionStatus,
+            optional: true,
+        },
+        counts: {
+            type: Counts,
+            optional: true,
+        },
     },
 )]
 #[derive(Serialize, Deserialize)]
@@ -722,9 +728,11 @@ pub struct DataStoreStatus {
     /// Available space (bytes).
     pub avail: u64,
     /// Status of last GC
-    pub gc_status: GarbageCollectionStatus,
+    #[serde(skip_serializing_if="Option::is_none")]
+    pub gc_status: Option<GarbageCollectionStatus>,
     /// Group/Snapshot counts
-    pub counts: Counts,
+    #[serde(skip_serializing_if="Option::is_none")]
+    pub counts: Option<Counts>,
 }
 
 #[api(

www/datastore/Summary.js

@@ -78,7 +78,7 @@ Ext.define('PBS.DataStoreInfo', {
 	    let datastore = encodeURIComponent(view.datastore);
 	    me.store = Ext.create('Proxmox.data.ObjectStore', {
 		interval: 5*1000,
-		url: `/api2/json/admin/datastore/${datastore}/status`,
+		url: `/api2/json/admin/datastore/${datastore}/status/?verbose=true`,
 	    });
 	    me.store.on('load', me.onLoad, me);
 	},