[pbs-devel] [RFC proxmox-backup 21/36] catalog: shell: factor out pxar fuse reader instantiation

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

In preparation to allow restoring split metadata and payload stream
pxar archives via the catalog shell.

Make the pxar fuse reader instantiation reusable.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
 proxmox-backup-client/src/catalog.rs | 45 ++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 13 deletions(-)

diff --git a/proxmox-backup-client/src/catalog.rs b/proxmox-backup-client/src/catalog.rs
index 72b22e67..d6859be3 100644
--- a/proxmox-backup-client/src/catalog.rs
+++ b/proxmox-backup-client/src/catalog.rs
@@ -11,6 +11,7 @@ use proxmox_schema::api;
 use pbs_api_types::BackupNamespace;
 use pbs_client::tools::key_source::get_encryption_key_password;
 use pbs_client::{BackupReader, RemoteChunkReader};
+use pbs_datastore::BackupManifest;
 use pbs_tools::crypt_config::CryptConfig;
 use pbs_tools::json::required_string_param;
 
@@ -124,6 +125,32 @@ async fn dump_catalog(param: Value) -> Result<Value, Error> {
     Ok(Value::Null)
 }
 
+async fn get_pxar_fuse_reader(
+    server_archive_name: &str,
+    client: Arc<BackupReader>,
+    manifest: &BackupManifest,
+    crypt_config: Option<Arc<CryptConfig>>,
+) -> Result<(pbs_pxar_fuse::Reader, u64), Error> {
+    let index = client
+        .download_dynamic_index(&manifest, &server_archive_name)
+        .await?;
+
+    let most_used = index.find_most_used_chunks(8);
+    let file_info = manifest.lookup_file_info(&server_archive_name)?;
+    let chunk_reader = RemoteChunkReader::new(
+        client.clone(),
+        crypt_config.clone(),
+        file_info.chunk_crypt_mode(),
+        most_used,
+    );
+
+    let reader = BufferedDynamicReader::new(index, chunk_reader);
+    let archive_size = reader.archive_size();
+    let reader: pbs_pxar_fuse::Reader = Arc::new(BufferedDynamicReadAt::new(reader));
+
+    Ok((reader, archive_size))
+}
+
 #[api(
     input: {
         properties: {
@@ -205,21 +232,13 @@ async fn catalog_shell(param: Value) -> Result<(), Error> {
     let (manifest, _) = client.download_manifest().await?;
     manifest.check_fingerprint(crypt_config.as_ref().map(Arc::as_ref))?;
 
-    let index = client
-        .download_dynamic_index(&manifest, &server_archive_name)
-        .await?;
-    let most_used = index.find_most_used_chunks(8);
-
-    let file_info = manifest.lookup_file_info(&server_archive_name)?;
-    let chunk_reader = RemoteChunkReader::new(
+    let (reader, archive_size) = get_pxar_fuse_reader(
+        &server_archive_name,
         client.clone(),
+        &manifest,
         crypt_config.clone(),
-        file_info.chunk_crypt_mode(),
-        most_used,
-    );
-    let reader = BufferedDynamicReader::new(index, chunk_reader);
-    let archive_size = reader.archive_size();
-    let reader: pbs_pxar_fuse::Reader = Arc::new(BufferedDynamicReadAt::new(reader));
+    ).await?;
+
     let decoder = pbs_pxar_fuse::Accessor::new(reader, archive_size).await?;
 
     client.download(CATALOG_NAME, &mut tmpfile).await?;
-- 
2.39.2