backup: Add support for client side encryption

first try ...

src/api2/backup/upload_chunk.rs

@@ -10,20 +10,23 @@ use crate::tools;
 use crate::backup::*;
 use crate::api_schema::*;
 use crate::api_schema::router::*;
+use crate::api2::types::*;
 
 use super::environment::*;
 
 pub struct UploadChunk {
     stream: Body,
     store: Arc<DataStore>,
+    digest: [u8; 32],
     size: u32,
-    chunk: Vec<u8>,
+    encoded_size: u32,
+    raw_data: Option<Vec<u8>>,
 }
 
 impl UploadChunk {
 
-    pub fn new(stream: Body,  store: Arc<DataStore>, size: u32) -> Self {
-        Self { stream, store, size, chunk: vec![] }
+    pub fn new(stream: Body,  store: Arc<DataStore>, digest: [u8; 32], size: u32, encoded_size: u32) -> Self {
+        Self { stream, store, size, encoded_size, raw_data: Some(vec![]), digest }
     }
 }
 
@@ -34,20 +37,30 @@ impl Future for UploadChunk {
     fn poll(&mut self) -> Poll<([u8; 32], u32, u32, bool), failure::Error> {
         loop {
             match try_ready!(self.stream.poll()) {
-                Some(chunk) => {
-                    if (self.chunk.len() + chunk.len()) > (self.size as usize) {
-                        bail!("uploaded chunk is larger than announced.");
+                Some(input) => {
+                    if let Some(ref mut raw_data) = self.raw_data {
+                        if (raw_data.len() + input.len()) > (self.encoded_size as usize) {
+                            bail!("uploaded chunk is larger than announced.");
+                        }
+                        raw_data.extend_from_slice(&input);
+                    } else {
+                        bail!("poll upload chunk stream failed - already finished.");
                     }
-                    self.chunk.extend_from_slice(&chunk);
                 }
                 None => {
-                    if self.chunk.len() != (self.size as usize) {
-                        bail!("uploaded chunk has unexpected size.");
+                    if let Some(raw_data) = self.raw_data.take() {
+                        if raw_data.len() != (self.encoded_size as usize) {
+                            bail!("uploaded chunk has unexpected size.");
+                        }
+
+                        let chunk = DataChunk::from_raw(raw_data, self.digest)?;
+
+                        let (is_duplicate, compressed_size) = self.store.insert_chunk(&chunk)?;
+
+                        return Ok(Async::Ready((self.digest, self.size, compressed_size as u32, is_duplicate)))
+                    } else {
+                        bail!("poll upload chunk stream failed - already finished.");
                     }
-
-                    let (is_duplicate, digest, compressed_size) = self.store.insert_chunk(&self.chunk)?;
-
-                    return Ok(Async::Ready((digest, self.size, compressed_size as u32, is_duplicate)))
                 }
             }
         }
@@ -62,10 +75,15 @@ pub fn api_method_upload_fixed_chunk() -> ApiAsyncMethod {
                       .minimum(1)
                       .maximum(256)
             )
+            .required("digest", CHUNK_DIGEST_SCHEMA.clone())
             .required("size", IntegerSchema::new("Chunk size.")
                       .minimum(1)
                       .maximum(1024*1024*16)
             )
+            .required("encoded-size", IntegerSchema::new("Encoded chunk size.")
+                      .minimum(9)
+                      // fixme: .maximum(1024*1024*16+40)
+            )
     )
 }
 
@@ -79,10 +97,14 @@ fn upload_fixed_chunk(
 
     let wid = tools::required_integer_param(&param, "wid")? as usize;
     let size = tools::required_integer_param(&param, "size")? as u32;
+    let encoded_size = tools::required_integer_param(&param, "encoded-size")? as u32;
+
+    let digest_str = tools::required_string_param(&param, "digest")?;
+    let digest = crate::tools::hex_to_digest(digest_str)?;
 
     let env: &BackupEnvironment = rpcenv.as_ref();
 
-    let upload = UploadChunk::new(req_body, env.datastore.clone(), size);
+    let upload = UploadChunk::new(req_body, env.datastore.clone(), digest, size, encoded_size);
 
     let resp = upload
         .then(move |result| {
@@ -109,10 +131,15 @@ pub fn api_method_upload_dynamic_chunk() -> ApiAsyncMethod {
                       .minimum(1)
                       .maximum(256)
             )
+            .required("digest", CHUNK_DIGEST_SCHEMA.clone())
             .required("size", IntegerSchema::new("Chunk size.")
                       .minimum(1)
                       .maximum(1024*1024*16)
             )
+            .required("encoded-size", IntegerSchema::new("Encoded chunk size.")
+                      .minimum(9)
+                      // fixme: .maximum(1024*1024*16+40)
+            )
     )
 }
 
@@ -126,10 +153,14 @@ fn upload_dynamic_chunk(
 
     let wid = tools::required_integer_param(&param, "wid")? as usize;
     let size = tools::required_integer_param(&param, "size")? as u32;
+    let encoded_size = tools::required_integer_param(&param, "encoded-size")? as u32;
+
+    let digest_str = tools::required_string_param(&param, "digest")?;
+    let digest = crate::tools::hex_to_digest(digest_str)?;
 
     let env: &BackupEnvironment = rpcenv.as_ref();
 
-    let upload = UploadChunk::new(req_body, env.datastore.clone(), size);
+    let upload = UploadChunk::new(req_body, env.datastore.clone(), digest, size, encoded_size);
 
     let resp = upload
         .then(move |result| {

src/backup/chunk_store.rs

@@ -1,14 +1,13 @@
 use failure::*;
 
 use std::path::{Path, PathBuf};
-use std::io::{Read, Write};
+use std::io::Write;
 use std::sync::{Arc, Mutex};
 use std::os::unix::io::AsRawFd;
 use serde_derive::Serialize;
 
-use openssl::sha;
-
 use crate::tools;
+use super::DataChunk;
 
 #[derive(Clone, Serialize)]
 pub struct GarbageCollectionStatus {
@@ -173,21 +172,19 @@ impl ChunkStore {
         Ok(())
     }
 
-    pub fn read_chunk(&self, digest:&[u8], buffer: &mut Vec<u8>) -> Result<(), Error> {
+    pub fn read_chunk(&self, digest:&[u8; 32]) -> Result<DataChunk, Error> {
 
         let mut chunk_path = self.chunk_dir.clone();
-        let prefix = digest_to_prefix(&digest);
+        let prefix = digest_to_prefix(digest);
         chunk_path.push(&prefix);
-        let digest_str = tools::digest_to_hex(&digest);
+        let digest_str = tools::digest_to_hex(digest);
         chunk_path.push(&digest_str);
 
-        buffer.clear();
-        let f = std::fs::File::open(&chunk_path)?;
-        let mut decoder = zstd::stream::Decoder::new(f)?;
+        let mut file = std::fs::File::open(&chunk_path)
+            .map_err(|err| format_err!(
+                "store '{}', unable to read chunk '{}' - {}", self.name, digest_str, err))?;
 
-        decoder.read_to_end(buffer)?;
-
-        Ok(())
+        DataChunk::load(&mut file, *digest)
     }
 
     pub fn get_chunk_iterator(
@@ -320,21 +317,14 @@ impl ChunkStore {
         Ok(())
     }
 
-    pub fn insert_chunk(&self, chunk: &[u8]) -> Result<(bool, [u8; 32], u64), Error> {
-
-        // fixme: use Sha512/256 when available
-        let digest = sha::sha256(chunk);
-        let (new, csize) = self.insert_chunk_noverify(&digest, chunk)?;
-        Ok((new, digest, csize))
-    }
-
-    pub fn insert_chunk_noverify(
+    pub fn insert_chunk(
         &self,
-        digest: &[u8; 32],
-        chunk: &[u8],
+        chunk: &DataChunk,
     ) -> Result<(bool, u64), Error> {
 
-        //println!("DIGEST {}", tools::digest_to_hex(&digest));
+        let digest = chunk.digest();
+
+        //println!("DIGEST {}", tools::digest_to_hex(digest));
 
         let mut chunk_path = self.chunk_dir.clone();
         let prefix = digest_to_prefix(digest);
@@ -355,12 +345,12 @@ impl ChunkStore {
         let mut tmp_path = chunk_path.clone();
         tmp_path.set_extension("tmp");
 
-        let f = std::fs::File::create(&tmp_path)?;
+        let mut file = std::fs::File::create(&tmp_path)?;
 
-        let mut encoder = zstd::stream::Encoder::new(f, 1)?;
+        let raw_data = chunk.raw_data();
+        let encoded_size = raw_data.len() as u64;
 
-        encoder.write_all(chunk)?;
-        let f = encoder.finish()?;
+        file.write_all(raw_data)?;
 
         if let Err(err) = std::fs::rename(&tmp_path, &chunk_path) {
             if let Err(_) = std::fs::remove_file(&tmp_path)  { /* ignore */ }
@@ -372,15 +362,9 @@ impl ChunkStore {
             );
         }
 
-        // fixme: is there a better way to get the compressed size?
-        let stat = nix::sys::stat::fstat(f.as_raw_fd())?;
-        let compressed_size = stat.st_size as u64;
-
-        //println!("PATH {:?}", chunk_path);
-
         drop(lock);
 
-        Ok((false, compressed_size))
+        Ok((false, encoded_size))
     }
 
     pub fn relative_path(&self, path: &Path) -> PathBuf {
@@ -416,10 +400,13 @@ fn test_chunk_store1() {
     assert!(chunk_store.is_err());
 
     let chunk_store = ChunkStore::create("test", &path).unwrap();
-    let (exists, _, _) = chunk_store.insert_chunk(&[0u8, 1u8]).unwrap();
+
+    let chunk = super::DataChunkBuilder::new(&[0u8, 1u8]).build().unwrap();
+
+    let (exists, _) = chunk_store.insert_chunk(&chunk).unwrap();
     assert!(!exists);
 
-    let (exists, _, _) = chunk_store.insert_chunk(&[0u8, 1u8]).unwrap();
+    let (exists, _) = chunk_store.insert_chunk(&chunk).unwrap();
     assert!(exists);
 
 

src/backup/datastore.rs

@@ -13,6 +13,7 @@ use super::fixed_index::*;
 use super::dynamic_index::*;
 use super::index::*;
 use super::backup_info::*;
+use super::DataChunk;
 use crate::server::WorkerTask;
 
 lazy_static!{
@@ -256,15 +257,10 @@ impl DataStore {
         Ok(())
     }
 
-    pub fn insert_chunk(&self, chunk: &[u8]) -> Result<(bool, [u8; 32], u64), Error> {
+    pub fn insert_chunk(
+        &self,
+        chunk: &DataChunk,
+    ) -> Result<(bool, u64), Error> {
         self.chunk_store.insert_chunk(chunk)
     }
-
-    pub fn insert_chunk_noverify(
-        &self,
-        digest: &[u8; 32],
-        chunk: &[u8],
-    ) -> Result<(bool, u64), Error> {
-        self.chunk_store.insert_chunk_noverify(digest, chunk)
-    }
 }

src/backup/dynamic_index.rs

@@ -1,4 +1,5 @@
 use failure::*;
+use std::convert::TryInto;
 
 use crate::tools;
 use super::IndexFile;
@@ -17,6 +18,8 @@ use uuid::Uuid;
 use crate::tools::io::ops::*;
 use crate::tools::vec;
 
+use super::{DataChunk, DataChunkBuilder};
+
 /// Header format definition for dynamic index files (`.dixd`)
 #[repr(C)]
 pub struct DynamicIndexHeader {
@@ -158,11 +161,12 @@ impl DynamicIndexReader {
     }
 
     #[inline]
-    fn chunk_digest(&self, pos: usize) -> &[u8] {
+    fn chunk_digest(&self, pos: usize) -> &[u8; 32] {
         if pos >= self.index_entries {
             panic!("chunk index out of range");
         }
-        unsafe {  std::slice::from_raw_parts(self.index.add(pos*40+8), 32) }
+        let slice = unsafe {  std::slice::from_raw_parts(self.index.add(pos*40+8), 32) };
+        slice.try_into().unwrap()
     }
 
     pub fn mark_used_chunks(&self, _status: &mut GarbageCollectionStatus) -> Result<(), Error> {
@@ -182,15 +186,14 @@ impl DynamicIndexReader {
 
     pub fn dump_pxar(&self, mut writer: Box<dyn Write>) -> Result<(), Error> {
 
-        let mut buffer = Vec::with_capacity(1024*1024);
-
         for pos in 0..self.index_entries {
             let _end = self.chunk_end(pos);
             let digest = self.chunk_digest(pos);
             //println!("Dump {:08x}", end );
-            self.store.read_chunk(digest, &mut buffer)?;
-            writer.write_all(&buffer)?;
-
+            let chunk = self.store.read_chunk(digest)?;
+            // fimxe: handle encrypted chunks
+            let data = chunk.decode(None)?;
+            writer.write_all(&data)?;
         }
 
         Ok(())
@@ -270,7 +273,14 @@ impl BufferedDynamicReader {
         let index = &self.index;
         let end = index.chunk_end(idx);
         let digest = index.chunk_digest(idx);
-        index.store.read_chunk(digest, &mut self.read_buffer)?;
+
+        let chunk = index.store.read_chunk(digest)?;
+        // fimxe: handle encrypted chunks
+        // fixme: avoid copy
+        let data = chunk.decode(None)?;
+
+        self.read_buffer.clear();
+        self.read_buffer.extend_from_slice(&data);
 
         self.buffered_chunk_idx = idx;
         self.buffered_chunk_start = end - (self.read_buffer.len() as u64);
@@ -433,7 +443,8 @@ impl DynamicIndexWriter {
         })
     }
 
-    pub fn insert_chunk(&self, chunk: &[u8]) -> Result<(bool, [u8; 32], u64), Error> {
+    // fixme: use add_chunk instead?
+    pub fn insert_chunk(&self, chunk: &DataChunk) -> Result<(bool, u64), Error> {
         self.store.insert_chunk(chunk)
     }
 
@@ -531,8 +542,14 @@ impl DynamicChunkWriter {
 
         self.last_chunk = self.chunk_offset;
 
-        match self.index.insert_chunk(&self.chunk_buffer) {
-            Ok((is_duplicate, digest, compressed_size)) => {
+        let chunk = DataChunkBuilder::new(&self.chunk_buffer)
+            .compress(true)
+            .build()?;
+
+        let digest = chunk.digest();
+
+        match self.index.insert_chunk(&chunk) {
+            Ok((is_duplicate, compressed_size)) => {
 
                 self.stat.compressed_size += compressed_size;
                 if is_duplicate {
@@ -542,7 +559,7 @@ impl DynamicChunkWriter {
                 }
 
                 println!("ADD CHUNK {:016x} {} {}% {} {}", self.chunk_offset, chunk_size,
-                         (compressed_size*100)/(chunk_size as u64), is_duplicate,  tools::digest_to_hex(&digest));
+                         (compressed_size*100)/(chunk_size as u64), is_duplicate,  tools::digest_to_hex(digest));
                 self.index.add_chunk(self.chunk_offset as u64, &digest)?;
                 self.chunk_buffer.truncate(0);
                 return Ok(());

src/backup/fixed_index.rs

@@ -12,6 +12,7 @@ use std::path::{Path, PathBuf};
 use std::os::unix::io::AsRawFd;
 use uuid::Uuid;
 use chrono::{Local, TimeZone};
+use super::ChunkInfo;
 
 /// Header format definition for fixed index files (`.fidx`)
 #[repr(C)]
@@ -307,29 +308,42 @@ impl FixedIndexWriter {
     }
 
     // Note: We want to add data out of order, so do not assume any order here.
-    pub fn add_chunk(&mut self, pos: usize, chunk: &[u8], stat: &mut ChunkStat) -> Result<(), Error> {
+    pub fn add_chunk(&mut self, chunk_info: &ChunkInfo, stat: &mut ChunkStat) -> Result<(), Error> {
 
-        let end = pos + chunk.len();
+        let chunk_len = chunk_info.chunk_len as usize;
+        let end = chunk_info.offset as usize;
+
+        if end < chunk_len {
+            bail!("got chunk with small offset ({} < {}", end, chunk_len);
+        }
+
+        let pos = end - chunk_len;
 
         if end > self.size {
             bail!("write chunk data exceeds size ({} >= {})", end, self.size);
         }
 
         // last chunk can be smaller
-        if ((end != self.size) && (chunk.len() != self.chunk_size)) ||
-            (chunk.len() > self.chunk_size) || (chunk.len() == 0) {
-                bail!("got chunk with wrong length ({} != {}", chunk.len(), self.chunk_size);
+        if ((end != self.size) && (chunk_len != self.chunk_size)) ||
+            (chunk_len > self.chunk_size) || (chunk_len == 0) {
+                bail!("got chunk with wrong length ({} != {}", chunk_len, self.chunk_size);
             }
 
         if pos & (self.chunk_size-1) != 0 { bail!("add unaligned chunk (pos = {})", pos); }
 
-        let (is_duplicate, digest, compressed_size) = self.store.insert_chunk(chunk)?;
+        if (end as u64) != chunk_info.offset {
+            bail!("got chunk with wrong offset ({} != {}", end, chunk_info.offset);
+        }
+
+        let (is_duplicate, compressed_size) = self.store.insert_chunk(&chunk_info.chunk)?;
 
         stat.chunk_count += 1;
         stat.compressed_size += compressed_size;
 
-        println!("ADD CHUNK {} {} {}% {} {}", pos, chunk.len(),
-                 (compressed_size*100)/(chunk.len() as u64), is_duplicate, tools::digest_to_hex(&digest));
+        let digest = chunk_info.chunk.digest();
+
+        println!("ADD CHUNK {} {} {}% {} {}", pos, chunk_len,
+                 (compressed_size*100)/(chunk_len as u64), is_duplicate, tools::digest_to_hex(digest));
 
         if is_duplicate {
             stat.duplicate_chunks += 1;
@@ -337,7 +351,7 @@ impl FixedIndexWriter {
             stat.disk_size += compressed_size;
         }
 
-        self.add_digest(pos / self.chunk_size, &digest)
+        self.add_digest(pos / self.chunk_size, digest)
     }
 
     pub fn add_digest(&mut self, index: usize, digest: &[u8; 32]) -> Result<(), Error> {

src/bin/proxmox-backup-client.rs

@@ -113,6 +113,7 @@ fn backup_directory<P: AsRef<Path>>(
     chunk_size: Option<usize>,
     all_file_systems: bool,
     verbose: bool,
+    crypt_config: Option<Arc<CryptConfig>>,
 ) -> Result<(), Error> {
 
     let pxar_stream = PxarBackupStream::open(dir_path.as_ref(), all_file_systems, verbose)?;
@@ -130,7 +131,7 @@ fn backup_directory<P: AsRef<Path>>(
             .map_err(|_| {}).map(|_| ())
     );
 
-    client.upload_stream(archive_name, stream, "dynamic", None).wait()?;
+    client.upload_stream(archive_name, stream, "dynamic", None, crypt_config).wait()?;
 
     Ok(())
 }
@@ -142,6 +143,7 @@ fn backup_image<P: AsRef<Path>>(
     image_size: u64,
     chunk_size: Option<usize>,
     _verbose: bool,
+    crypt_config: Option<Arc<CryptConfig>>,
 ) -> Result<(), Error> {
 
     let path = image_path.as_ref().to_owned();
@@ -153,7 +155,7 @@ fn backup_image<P: AsRef<Path>>(
 
     let stream = FixedChunkStream::new(stream, chunk_size.unwrap_or(4*1024*1024));
 
-    client.upload_stream(archive_name, stream, "fixed", Some(image_size)).wait()?;
+    client.upload_stream(archive_name, stream, "fixed", Some(image_size), crypt_config).wait()?;
 
     Ok(())
 }
@@ -456,6 +458,8 @@ fn create_backup(
     println!("Client name: {}", tools::nodename());
     println!("Start Time: {}", backup_time.to_rfc3339());
 
+    let crypt_config = None;
+
     let client = client.start_backup(repo.store(), "host", &backup_id, verbose).wait()?;
 
     for (backup_type, filename, target, size) in upload_list {
@@ -466,11 +470,27 @@ fn create_backup(
             }
             BackupType::PXAR => {
                 println!("Upload directory '{}' to '{:?}' as {}", filename, repo, target);
-                backup_directory(&client, &filename, &target, chunk_size_opt, all_file_systems, verbose)?;
+                backup_directory(
+                    &client,
+                    &filename,
+                    &target,
+                    chunk_size_opt,
+                    all_file_systems,
+                    verbose,
+                    crypt_config.clone(),
+                )?;
             }
             BackupType::IMAGE => {
                 println!("Upload image '{}' to '{:?}' as {}", filename, repo, target);
-                backup_image(&client, &filename, &target, size, chunk_size_opt, verbose)?;
+                backup_image(
+                    &client,
+                    &filename,
+                    &target,
+                    size,
+                    chunk_size_opt,
+                    verbose,
+                    crypt_config.clone(),
+                )?;
             }
         }
     }

src/client/http_client.rs

@@ -484,20 +484,11 @@ impl BackupClient {
         stream: impl Stream<Item=bytes::BytesMut, Error=Error>,
         prefix: &str,
         fixed_size: Option<u64>,
+        crypt_config: Option<Arc<CryptConfig>>,
     ) -> impl Future<Item=(), Error=Error> {
 
         let known_chunks = Arc::new(Mutex::new(HashSet::new()));
 
-        let mut stream_len = 0u64;
-
-        let stream = stream.
-            map(move |data| {
-                let digest = openssl::sha::sha256(&data);
-                let offset = stream_len;
-                stream_len += data.len() as u64;
-                ChunkInfo { data, digest, offset }
-            });
-
         let h2 = self.h2.clone();
         let h2_2 = self.h2.clone();
         let h2_3 = self.h2.clone();
@@ -519,7 +510,7 @@ impl BackupClient {
             })
             .and_then(move |res| {
                 let wid = res.as_u64().unwrap();
-                Self::upload_chunk_info_stream(h2_3, wid, stream, &prefix, known_chunks.clone())
+                Self::upload_chunk_info_stream(h2_3, wid, stream, &prefix, known_chunks.clone(), crypt_config)
                      .and_then(move |(chunk_count, size, _speed)| {
                         let param = json!({
                             "wid": wid ,
@@ -671,9 +662,10 @@ impl BackupClient {
     fn upload_chunk_info_stream(
         h2: H2Client,
         wid: u64,
-        stream: impl Stream<Item=ChunkInfo, Error=Error>,
+        stream: impl Stream<Item=bytes::BytesMut, Error=Error>,
         prefix: &str,
         known_chunks: Arc<Mutex<HashSet<[u8;32]>>>,
+        crypt_config: Option<Arc<CryptConfig>>,
     ) -> impl Future<Item=(usize, usize, usize), Error=Error> {
 
         let repeat = std::sync::Arc::new(AtomicUsize::new(0));
@@ -690,17 +682,29 @@ impl BackupClient {
         let start_time = std::time::Instant::now();
 
         stream
-            .map(move |chunk_info| {
+            .and_then(move |data| {
+
+                let chunk_len = data.len();
+
                 repeat.fetch_add(1, Ordering::SeqCst);
-                stream_len.fetch_add(chunk_info.data.len(), Ordering::SeqCst);
+                let offset = stream_len.fetch_add(chunk_len, Ordering::SeqCst) as u64;
+
+                let mut chunk_builder = DataChunkBuilder::new(data.as_ref())
+                    .compress(true);
+
+                if let Some(ref crypt_config) = crypt_config {
+                    chunk_builder = chunk_builder.crypt_config(crypt_config);
+                }
 
                 let mut known_chunks = known_chunks.lock().unwrap();
-                let chunk_is_known = known_chunks.contains(&chunk_info.digest);
+                let digest = chunk_builder.digest();
+                let chunk_is_known = known_chunks.contains(digest);
                 if chunk_is_known {
-                    MergedChunkInfo::Known(vec![(chunk_info.offset, chunk_info.digest)])
+                    Ok(MergedChunkInfo::Known(vec![(offset, *digest)]))
                 } else {
-                    known_chunks.insert(chunk_info.digest);
-                    MergedChunkInfo::New(chunk_info)
+                    known_chunks.insert(*digest);
+                    let chunk = chunk_builder.build()?;
+                    Ok(MergedChunkInfo::New(ChunkInfo { chunk, chunk_len: chunk_len as u64, offset }))
                 }
             })
             .merge_known_chunks()
@@ -708,15 +712,23 @@ impl BackupClient {
 
                 if let MergedChunkInfo::New(chunk_info) = merged_chunk_info {
                     let offset = chunk_info.offset;
-                    let digest = chunk_info.digest;
+                    let digest = *chunk_info.chunk.digest();
+                    let digest_str = tools::digest_to_hex(&digest);
                     let upload_queue = upload_queue.clone();
 
-                    println!("upload new chunk {} ({} bytes, offset {})", tools::digest_to_hex(&digest),
-                             chunk_info.data.len(), offset);
+                    println!("upload new chunk {} ({} bytes, offset {})", digest_str,
+                             chunk_info.chunk_len, offset);
+
+                    let chunk_data = chunk_info.chunk.raw_data();
+                    let param = json!({
+                        "wid": wid,
+                        "digest": digest_str,
+                        "size": chunk_info.chunk_len,
+                        "encoded-size": chunk_data.len(),
+                    });
 
-                    let param = json!({ "wid": wid, "size" : chunk_info.data.len() });
                     let request = H2Client::request_builder("localhost", "POST", &upload_chunk_path, Some(param)).unwrap();
-                    let upload_data = Some(chunk_info.data.freeze());
+                    let upload_data = Some(bytes::Bytes::from(chunk_data));
 
                     let new_info = MergedChunkInfo::Known(vec![(offset, digest)]);
 
@@ -883,7 +895,7 @@ impl H2Client {
             .and_then(move |mut send_request| {
                 if let Some(data) = data {
                     let (response, stream) = send_request.send_request(request, false).unwrap();
-                    future::Either::A(PipeToSendStream::new(bytes::Bytes::from(data), stream)
+                    future::Either::A(PipeToSendStream::new(data, stream)
                         .and_then(move |_| {
                             future::ok(response)
                         }))