implement scan_pubkeys for hot storage (#666)

accounts-db/src/accounts_db.rs

@@ -2418,8 +2418,24 @@ impl AccountsDb {
         AccountsDb::new_for_tests(Vec::new(), &ClusterType::Development)
     }
 
+    pub fn new_single_for_tests_with_provider(file_provider: AccountsFileProvider) -> Self {
+        AccountsDb::new_for_tests_with_provider(
+            Vec::new(),
+            &ClusterType::Development,
+            file_provider,
+        )
+    }
+
     pub fn new_for_tests(paths: Vec<PathBuf>, cluster_type: &ClusterType) -> Self {
-        AccountsDb::new_with_config(
+        Self::new_for_tests_with_provider(paths, cluster_type, AccountsFileProvider::default())
+    }
+
+    fn new_for_tests_with_provider(
+        paths: Vec<PathBuf>,
+        cluster_type: &ClusterType,
+        accounts_file_provider: AccountsFileProvider,
+    ) -> Self {
+        let mut db = AccountsDb::new_with_config(
             paths,
             cluster_type,
             AccountSecondaryIndexes::default(),
@@ -2427,7 +2443,9 @@ impl AccountsDb {
             Some(ACCOUNTS_DB_CONFIG_FOR_TESTING),
             None,
             Arc::default(),
-        )
+        );
+        db.accounts_file_provider = accounts_file_provider;
+        db
     }
 
     pub fn new_with_config(
@@ -15328,10 +15346,11 @@ pub mod tests {
     ///     - ensure Account1 has *not* been purged
     /// - call `clean_accounts()` with `last_full_snapshot_slot` set to 3
     ///     - ensure Account1 *has* been purged
-    #[test]
+    #[test_case(AccountsFileProvider::AppendVec)]
-    fn test_clean_accounts_with_last_full_snapshot_slot() {
+    #[test_case(AccountsFileProvider::HotStorage)]
+    fn test_clean_accounts_with_last_full_snapshot_slot(file_provider: AccountsFileProvider) {
         solana_logger::setup();
-        let accounts_db = AccountsDb::new_single_for_tests();
+        let accounts_db = AccountsDb::new_single_for_tests_with_provider(file_provider);
         let pubkey = solana_sdk::pubkey::new_rand();
         let owner = solana_sdk::pubkey::new_rand();
         let space = 0;

accounts-db/src/accounts_file.rs

@@ -197,7 +197,11 @@ impl AccountsFile {
     pub(crate) fn scan_pubkeys(&self, callback: impl FnMut(&Pubkey)) {
         match self {
             Self::AppendVec(av) => av.scan_pubkeys(callback),
-            Self::TieredStorage(_) => unimplemented!(),
+            Self::TieredStorage(ts) => {
+                if let Some(reader) = ts.reader() {
+                    _ = reader.scan_pubkeys(callback);
+                }
+            }
         }
     }
 

accounts-db/src/tiered_storage/hot.rs

@@ -554,6 +554,14 @@ impl HotStorageReader {
         Ok(accounts)
     }
 
+    pub fn scan_pubkeys(&self, mut callback: impl FnMut(&Pubkey)) -> TieredStorageResult<()> {
+        for i in 0..self.footer.account_entry_count {
+            let address = self.get_account_address(IndexOffset(i))?;
+            callback(address);
+        }
+        Ok(())
+    }
+
     /// Returns a slice suitable for use when archiving hot storages
     pub fn data_for_archive(&self) -> &[u8] {
         self.mmap.as_ref()

accounts-db/src/tiered_storage/readable.rs

@@ -109,6 +109,12 @@ impl TieredStorageReader {
         }
     }
 
+    pub fn scan_pubkeys(&self, callback: impl FnMut(&Pubkey)) -> TieredStorageResult<()> {
+        match self {
+            Self::Hot(hot) => hot.scan_pubkeys(callback),
+        }
+    }
+
     /// Returns a slice suitable for use when archiving tiered storages
     pub fn data_for_archive(&self) -> &[u8] {
         match self {