[pbs-devel] [RFC proxmox-backup 17/20] fix #3174: chunker: add forced boundaries

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

Allow to force a boundary while chunking and inject reused chunks into
the stream. Duoble ended queues are used to control the boundaries and
chunk injection between archiver, chunker and uploader.

The archiver gets an interface to request a boundary and push a list of
chunks to inject following that boundary. The chunker reads this queue,
creating the boundary and passing the list of chunks to inject to the
uploader via a second, dedicated double ended queue.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
 examples/test_chunk_speed2.rs                 |  9 +++-
 pbs-client/src/backup_writer.rs               |  6 ++-
 pbs-client/src/chunk_stream.rs                | 41 ++++++++++++++++++-
 pbs-client/src/pxar/create.rs                 | 10 ++++-
 pbs-client/src/pxar_backup_stream.rs          |  8 +++-
 proxmox-backup-client/src/main.rs             | 36 ++++++++++++----
 .../src/proxmox_restore_daemon/api.rs         | 13 +++++-
 pxar-bin/src/main.rs                          |  5 ++-
 tests/catar.rs                                |  3 ++
 9 files changed, 114 insertions(+), 17 deletions(-)

diff --git a/examples/test_chunk_speed2.rs b/examples/test_chunk_speed2.rs
index 3f69b436..e8bac726 100644
--- a/examples/test_chunk_speed2.rs
+++ b/examples/test_chunk_speed2.rs
@@ -1,5 +1,7 @@
 use anyhow::Error;
 use futures::*;
+use std::collections::VecDeque;
+use std::sync::{Arc, Mutex};
 
 extern crate proxmox_backup;
 
@@ -26,7 +28,12 @@ async fn run() -> Result<(), Error> {
         .map_err(Error::from);
 
     //let chunk_stream = FixedChunkStream::new(stream, 4*1024*1024);
-    let mut chunk_stream = ChunkStream::new(stream, None);
+    let mut chunk_stream = ChunkStream::new(
+        stream,
+        None,
+        Arc::new(Mutex::new(VecDeque::new())),
+        Arc::new(Mutex::new(VecDeque::new())),
+    );
 
     let start_time = std::time::Instant::now();
 
diff --git a/pbs-client/src/backup_writer.rs b/pbs-client/src/backup_writer.rs
index 8a03d8ea..cc6dd49a 100644
--- a/pbs-client/src/backup_writer.rs
+++ b/pbs-client/src/backup_writer.rs
@@ -1,4 +1,4 @@
-use std::collections::HashSet;
+use std::collections::{HashSet, VecDeque};
 use std::future::Future;
 use std::os::unix::fs::OpenOptionsExt;
 use std::sync::atomic::{AtomicU64, AtomicUsize, Ordering};
@@ -23,6 +23,7 @@ use pbs_tools::crypt_config::CryptConfig;
 
 use proxmox_human_byte::HumanByte;
 
+use super::inject_reused_chunks::InjectChunks;
 use super::merge_known_chunks::{MergeKnownChunks, MergedChunkInfo};
 
 use super::{H2Client, HttpClient};
@@ -265,6 +266,7 @@ impl BackupWriter {
         archive_name: &str,
         stream: impl Stream<Item = Result<bytes::BytesMut, Error>>,
         options: UploadOptions,
+        injection_queue: Arc<Mutex<VecDeque<InjectChunks>>>,
     ) -> Result<BackupStats, Error> {
         let known_chunks = Arc::new(Mutex::new(HashSet::new()));
 
@@ -341,6 +343,7 @@ impl BackupWriter {
                 None
             },
             options.compress,
+            injection_queue,
         )
         .await?;
 
@@ -637,6 +640,7 @@ impl BackupWriter {
         known_chunks: Arc<Mutex<HashSet<[u8; 32]>>>,
         crypt_config: Option<Arc<CryptConfig>>,
         compress: bool,
+        injection_queue: Arc<Mutex<VecDeque<InjectChunks>>>,
     ) -> impl Future<Output = Result<UploadStats, Error>> {
         let total_chunks = Arc::new(AtomicUsize::new(0));
         let total_chunks2 = total_chunks.clone();
diff --git a/pbs-client/src/chunk_stream.rs b/pbs-client/src/chunk_stream.rs
index 895f6eae..1373502f 100644
--- a/pbs-client/src/chunk_stream.rs
+++ b/pbs-client/src/chunk_stream.rs
@@ -1,5 +1,7 @@
 use std::pin::Pin;
 use std::task::{Context, Poll};
+use std::sync::{Arc, Mutex};
+use std::collections::VecDeque;
 
 use anyhow::Error;
 use bytes::BytesMut;
@@ -8,21 +10,34 @@ use futures::stream::{Stream, TryStream};
 
 use pbs_datastore::Chunker;
 
+use crate::inject_reused_chunks::InjectChunks;
+
 /// Split input stream into dynamic sized chunks
 pub struct ChunkStream<S: Unpin> {
     input: S,
     chunker: Chunker,
     buffer: BytesMut,
     scan_pos: usize,
+    consumed: u64,
+    boundaries: Arc<Mutex<VecDeque<InjectChunks>>>,
+    injections: Arc<Mutex<VecDeque<InjectChunks>>>,
 }
 
 impl<S: Unpin> ChunkStream<S> {
-    pub fn new(input: S, chunk_size: Option<usize>) -> Self {
+    pub fn new(
+        input: S,
+        chunk_size: Option<usize>,
+        boundaries: Arc<Mutex<VecDeque<InjectChunks>>>,
+        injections: Arc<Mutex<VecDeque<InjectChunks>>>,
+    ) -> Self {
         Self {
             input,
             chunker: Chunker::new(chunk_size.unwrap_or(4 * 1024 * 1024)),
             buffer: BytesMut::new(),
             scan_pos: 0,
+            consumed: 0,
+            boundaries,
+            injections,
         }
     }
 }
@@ -40,6 +55,29 @@ where
     fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         let this = self.get_mut();
         loop {
+            { 
+                // Make sure to release this lock and don't hold it longer than required
+                let mut boundaries = this.boundaries.lock().unwrap();
+                if let Some(inject) = boundaries.pop_front() {
+                    let max = this.consumed + this.buffer.len() as u64;
+                    if inject.boundary <= max {
+                        let chunk_size = (inject.boundary - this.consumed) as usize;
+                        let result = this.buffer.split_to(chunk_size);
+                        this.consumed += chunk_size as u64;
+                        this.scan_pos = 0;
+
+                        // Add the size of the injected chunks to consumed, so chunk stream offsets
+                        // are in sync with the rest of the archive.
+                        this.consumed += inject.size as u64;
+
+                        this.injections.lock().unwrap().push_back(inject);
+
+                        return Poll::Ready(Some(Ok(result)));
+                    }
+                    boundaries.push_front(inject);
+                }
+            }
+
             if this.scan_pos < this.buffer.len() {
                 let boundary = this.chunker.scan(&this.buffer[this.scan_pos..]);
 
@@ -50,6 +88,7 @@ where
                     // continue poll
                 } else if chunk_size <= this.buffer.len() {
                     let result = this.buffer.split_to(chunk_size);
+                    this.consumed += chunk_size as u64;
                     this.scan_pos = 0;
                     return Poll::Ready(Some(Ok(result)));
                 } else {
diff --git a/pbs-client/src/pxar/create.rs b/pbs-client/src/pxar/create.rs
index 5feb7e6e..d6afc465 100644
--- a/pbs-client/src/pxar/create.rs
+++ b/pbs-client/src/pxar/create.rs
@@ -1,4 +1,4 @@
-use std::collections::{HashMap, HashSet};
+use std::collections::{HashMap, HashSet, VecDeque};
 use std::ffi::{CStr, CString, OsStr};
 use std::fmt;
 use std::io::{self, Read};
@@ -25,8 +25,9 @@ use proxmox_lang::c_str;
 use proxmox_sys::fs::{self, acl, xattr};
 
 use pbs_datastore::catalog::{BackupCatalogWriter, CatalogReader};
-use pbs_datastore::dynamic_index::DynamicIndexReader;
+use pbs_datastore::dynamic_index::{DynamicEntry, DynamicIndexReader};
 
+use crate::inject_reused_chunks::InjectChunks;
 use crate::pxar::metadata::errno_is_unsupported;
 use crate::pxar::tools::assert_single_path_component;
 use crate::pxar::Flags;
@@ -142,6 +143,8 @@ struct Archiver {
     hardlinks: HashMap<HardLinkInfo, (PathBuf, LinkOffset)>,
     file_copy_buffer: Vec<u8>,
     previous_ref: Option<PxarPrevRef>,
+    forced_boundaries: Arc<Mutex<VecDeque<InjectChunks>>>,
+    inject: (usize, Vec<DynamicEntry>),
 }
 
 type Encoder<'a, T> = pxar::encoder::aio::Encoder<'a, T>;
@@ -153,6 +156,7 @@ pub async fn create_archive<T, F>(
     callback: F,
     catalog: Option<Arc<Mutex<dyn BackupCatalogWriter + Send>>>,
     options: PxarCreateOptions,
+    forced_boundaries: Arc<Mutex<VecDeque<InjectChunks>>>,
 ) -> Result<(), Error>
 where
     T: SeqWrite + Send,
@@ -207,6 +211,8 @@ where
         hardlinks: HashMap::new(),
         file_copy_buffer: vec::undefined(4 * 1024 * 1024),
         previous_ref: options.previous_ref,
+        forced_boundaries,
+        inject: (0, Vec::new()),
     };
 
     archiver
diff --git a/pbs-client/src/pxar_backup_stream.rs b/pbs-client/src/pxar_backup_stream.rs
index 22a6ffdc..d18ba470 100644
--- a/pbs-client/src/pxar_backup_stream.rs
+++ b/pbs-client/src/pxar_backup_stream.rs
@@ -1,3 +1,4 @@
+use std::collections::VecDeque;
 use std::io::Write;
 //use std::os::unix::io::FromRawFd;
 use std::path::Path;
@@ -17,6 +18,8 @@ use proxmox_io::StdChannelWriter;
 
 use pbs_datastore::catalog::CatalogWriter;
 
+use crate::inject_reused_chunks::InjectChunks;
+
 /// Stream implementation to encode and upload .pxar archives.
 ///
 /// The hyper client needs an async Stream for file upload, so we
@@ -40,6 +43,7 @@ impl PxarBackupStream {
         dir: Dir,
         catalog: Arc<Mutex<CatalogWriter<W>>>,
         options: crate::pxar::PxarCreateOptions,
+        boundaries: Arc<Mutex<VecDeque<InjectChunks>>>,
     ) -> Result<Self, Error> {
         let (tx, rx) = std::sync::mpsc::sync_channel(10);
 
@@ -64,6 +68,7 @@ impl PxarBackupStream {
                 },
                 Some(catalog),
                 options,
+                boundaries,
             )
             .await
             {
@@ -87,10 +92,11 @@ impl PxarBackupStream {
         dirname: &Path,
         catalog: Arc<Mutex<CatalogWriter<W>>>,
         options: crate::pxar::PxarCreateOptions,
+        boundaries: Arc<Mutex<VecDeque<InjectChunks>>>,
     ) -> Result<Self, Error> {
         let dir = nix::dir::Dir::open(dirname, OFlag::O_DIRECTORY, Mode::empty())?;
 
-        Self::new(dir, catalog, options)
+        Self::new(dir, catalog, options, boundaries)
     }
 }
 
diff --git a/proxmox-backup-client/src/main.rs b/proxmox-backup-client/src/main.rs
index 509fa22c..5945ae5d 100644
--- a/proxmox-backup-client/src/main.rs
+++ b/proxmox-backup-client/src/main.rs
@@ -1,4 +1,4 @@
-use std::collections::HashSet;
+use std::collections::{HashSet, VecDeque};
 use std::io::{self, Read, Seek, SeekFrom, Write};
 use std::path::{Path, PathBuf};
 use std::pin::Pin;
@@ -192,8 +192,17 @@ async fn backup_directory<P: AsRef<Path>>(
     pxar_create_options: pbs_client::pxar::PxarCreateOptions,
     upload_options: UploadOptions,
 ) -> Result<BackupStats, Error> {
-    let pxar_stream = PxarBackupStream::open(dir_path.as_ref(), catalog, pxar_create_options)?;
-    let mut chunk_stream = ChunkStream::new(pxar_stream, chunk_size);
+    let boundaries = Arc::new(Mutex::new(VecDeque::new()));
+    let pxar_stream = PxarBackupStream::open(
+        dir_path.as_ref(),
+        catalog,
+        pxar_create_options,
+        boundaries.clone(),
+    )?;
+
+    let injections = Arc::new(Mutex::new(VecDeque::new()));
+    let mut chunk_stream =
+        ChunkStream::new(pxar_stream, chunk_size, boundaries, injections.clone());
 
     let (tx, rx) = mpsc::channel(10); // allow to buffer 10 chunks
 
@@ -211,7 +220,7 @@ async fn backup_directory<P: AsRef<Path>>(
     }
 
     let stats = client
-        .upload_stream(archive_name, stream, upload_options)
+        .upload_stream(archive_name, stream, upload_options, injections)
         .await?;
 
     Ok(stats)
@@ -237,8 +246,9 @@ async fn backup_image<P: AsRef<Path>>(
         bail!("cannot backup image with dynamic chunk size!");
     }
 
+    let injection_queue = Arc::new(Mutex::new(VecDeque::new()));
     let stats = client
-        .upload_stream(archive_name, stream, upload_options)
+        .upload_stream(archive_name, stream, upload_options, injection_queue)
         .await?;
 
     Ok(stats)
@@ -529,7 +539,14 @@ fn spawn_catalog_upload(
     let (catalog_tx, catalog_rx) = std::sync::mpsc::sync_channel(10); // allow to buffer 10 writes
     let catalog_stream = proxmox_async::blocking::StdChannelStream(catalog_rx);
     let catalog_chunk_size = 512 * 1024;
-    let catalog_chunk_stream = ChunkStream::new(catalog_stream, Some(catalog_chunk_size));
+    let boundaries = Arc::new(Mutex::new(VecDeque::new()));
+    let injections = Arc::new(Mutex::new(VecDeque::new()));
+    let catalog_chunk_stream = ChunkStream::new(
+        catalog_stream,
+        Some(catalog_chunk_size),
+        boundaries,
+        injections.clone(),
+    );
 
     let catalog_writer = Arc::new(Mutex::new(CatalogWriter::new(TokioWriterAdapter::new(
         StdChannelWriter::new(catalog_tx),
@@ -545,7 +562,12 @@ fn spawn_catalog_upload(
 
     tokio::spawn(async move {
         let catalog_upload_result = client
-            .upload_stream(CATALOG_NAME, catalog_chunk_stream, upload_options)
+            .upload_stream(
+                CATALOG_NAME,
+                catalog_chunk_stream,
+                upload_options,
+                injections,
+            )
             .await;
 
         if let Err(ref err) = catalog_upload_result {
diff --git a/proxmox-restore-daemon/src/proxmox_restore_daemon/api.rs b/proxmox-restore-daemon/src/proxmox_restore_daemon/api.rs
index 27f20a1c..8f6b96ab 100644
--- a/proxmox-restore-daemon/src/proxmox_restore_daemon/api.rs
+++ b/proxmox-restore-daemon/src/proxmox_restore_daemon/api.rs
@@ -1,8 +1,10 @@
 ///! File-restore API running inside the restore VM
+use std::collections::VecDeque;
 use std::ffi::OsStr;
 use std::fs;
 use std::os::unix::ffi::OsStrExt;
 use std::path::{Path, PathBuf};
+use std::sync::{Arc, Mutex};
 
 use anyhow::{bail, Error};
 use futures::FutureExt;
@@ -357,8 +359,15 @@ fn extract(
                     };
 
                     let pxar_writer = TokioWriter::new(writer);
-                    create_archive(dir, pxar_writer, Flags::DEFAULT, |_| Ok(()), None, options)
-                        .await
+                    create_archive(
+                        dir,
+                        pxar_writer,
+                        Flags::DEFAULT,
+                        |_| Ok(()),
+                        None,
+                        options,
+                        Arc::new(Mutex::new(VecDeque::new())),
+                    ).await
                 }
                 .await;
                 if let Err(err) = result {
diff --git a/pxar-bin/src/main.rs b/pxar-bin/src/main.rs
index 9376a2c1..c019f3e4 100644
--- a/pxar-bin/src/main.rs
+++ b/pxar-bin/src/main.rs
@@ -1,10 +1,10 @@
-use std::collections::HashSet;
+use std::collections::{HashSet, VecDeque};
 use std::ffi::OsStr;
 use std::fs::OpenOptions;
 use std::os::unix::fs::OpenOptionsExt;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicBool, Ordering};
-use std::sync::Arc;
+use std::sync::{Arc, Mutex};
 
 use anyhow::{bail, format_err, Error};
 use futures::future::FutureExt;
@@ -384,6 +384,7 @@ async fn create_archive(
         },
         None,
         options,
+        Arc::new(Mutex::new(VecDeque::new())),
     )
     .await?;
 
diff --git a/tests/catar.rs b/tests/catar.rs
index 36bb4f3b..d69cb37b 100644
--- a/tests/catar.rs
+++ b/tests/catar.rs
@@ -1,4 +1,6 @@
 use std::process::Command;
+use std::sync::{Arc, Mutex};
+use std::collections::VecDeque;
 
 use anyhow::Error;
 
@@ -40,6 +42,7 @@ fn run_test(dir_name: &str) -> Result<(), Error> {
         |_| Ok(()),
         None,
         options,
+        Arc::new(Mutex::new(VecDeque::new())),
     ))?;
 
     Command::new("cmp")
-- 
2.39.2