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From: Christian Ebner <c.ebner@proxmox.com>
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Date: Mon, 27 May 2024 16:32:35 +0200
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Subject: [pbs-devel] [PATCH v7 proxmox-backup 21/69] client: helper: add
helpers for creating reader instances
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Add module to place helper methods which need to be used in different
submodules of the client.
Add `get_pxar_fuse_reader`, `get_buffered_pxar_reader` and
`get_pxar_fuse_accessor` to create reader instances to access pxar
archives.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
changes since version 6:
- adapt to new PxarVariant pxar interface type
- fix clippy warnings
proxmox-backup-client/src/helper.rs | 72 +++++++++++++++++++++++++++++
proxmox-backup-client/src/main.rs | 2 +
2 files changed, 74 insertions(+)
create mode 100644 proxmox-backup-client/src/helper.rs
diff --git a/proxmox-backup-client/src/helper.rs b/proxmox-backup-client/src/helper.rs
new file mode 100644
index 000000000..5b21b6720
--- /dev/null
+++ b/proxmox-backup-client/src/helper.rs
@@ -0,0 +1,72 @@
+use std::sync::Arc;
+
+use anyhow::Error;
+use pbs_client::{BackupReader, RemoteChunkReader};
+use pbs_datastore::BackupManifest;
+use pbs_tools::crypt_config::CryptConfig;
+
+use crate::{BufferedDynamicReadAt, BufferedDynamicReader, IndexFile};
+
+pub(crate) async fn get_pxar_fuse_accessor(
+ archive_name: &str,
+ payload_archive_name: Option<&str>,
+ client: Arc<BackupReader>,
+ manifest: &BackupManifest,
+ crypt_config: Option<Arc<CryptConfig>>,
+) -> Result<pbs_pxar_fuse::Accessor, Error> {
+ let (reader, archive_size) =
+ get_pxar_fuse_reader(archive_name, client.clone(), manifest, crypt_config.clone()).await?;
+
+ let reader = if let Some(payload_archive_name) = payload_archive_name {
+ let (payload_reader, payload_size) = get_pxar_fuse_reader(
+ payload_archive_name,
+ client.clone(),
+ manifest,
+ crypt_config.clone(),
+ )
+ .await?;
+
+ pxar::PxarVariant::Split(reader, (payload_reader, payload_size))
+ } else {
+ pxar::PxarVariant::Unified(reader)
+ };
+
+ let accessor = pbs_pxar_fuse::Accessor::new(reader, archive_size).await?;
+
+ Ok(accessor)
+}
+
+pub(crate) async fn get_pxar_fuse_reader(
+ archive_name: &str,
+ client: Arc<BackupReader>,
+ manifest: &BackupManifest,
+ crypt_config: Option<Arc<CryptConfig>>,
+) -> Result<(pbs_pxar_fuse::Reader, u64), Error> {
+ let reader = get_buffered_pxar_reader(archive_name, client, manifest, crypt_config).await?;
+ let archive_size = reader.archive_size();
+ let reader: pbs_pxar_fuse::Reader = Arc::new(BufferedDynamicReadAt::new(reader));
+
+ Ok((reader, archive_size))
+}
+
+pub(crate) async fn get_buffered_pxar_reader(
+ archive_name: &str,
+ client: Arc<BackupReader>,
+ manifest: &BackupManifest,
+ crypt_config: Option<Arc<CryptConfig>>,
+) -> Result<BufferedDynamicReader<RemoteChunkReader>, Error> {
+ let index = client
+ .download_dynamic_index(manifest, archive_name)
+ .await?;
+
+ let most_used = index.find_most_used_chunks(8);
+ let file_info = manifest.lookup_file_info(archive_name)?;
+ let chunk_reader = RemoteChunkReader::new(
+ client.clone(),
+ crypt_config.clone(),
+ file_info.chunk_crypt_mode(),
+ most_used,
+ );
+
+ Ok(BufferedDynamicReader::new(index, chunk_reader))
+}
diff --git a/proxmox-backup-client/src/main.rs b/proxmox-backup-client/src/main.rs
index 25556d672..db0fb6324 100644
--- a/proxmox-backup-client/src/main.rs
+++ b/proxmox-backup-client/src/main.rs
@@ -72,6 +72,8 @@ mod catalog;
pub use catalog::*;
mod snapshot;
pub use snapshot::*;
+mod helper;
+pub(crate) use helper::*;
pub mod key;
pub mod namespace;
--
2.39.2
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