src/api2/backup.rs

   1 use failure::*;
   2 use futures::*;
   3 use hyper::header::{HeaderValue, UPGRADE};
   4 use hyper::http::request::Parts;
   5 use hyper::{Body, Response, StatusCode};
   6 use serde_json::{json, Value};
   7
   8 use proxmox::{sortable, identity, list_subdirs_api_method};
   9 use proxmox::api::{ApiResponseFuture, ApiHandler, ApiMethod, Router, RpcEnvironment};
  10 use proxmox::api::router::SubdirMap;
  11 use proxmox::api::schema::*;
  12
  13 use crate::tools;
  14 use crate::tools::wrapped_reader_stream::*;
  15 use crate::server::{WorkerTask, H2Service};
  16 use crate::backup::*;
  17 use crate::api2::types::*;
  18
  19 mod environment;
  20 use environment::*;
  21
  22 mod upload_chunk;
  23 use upload_chunk::*;
  24
  25 pub const ROUTER: Router = Router::new()
  26     .upgrade(&API_METHOD_UPGRADE_BACKUP);
  27
  28 #[sortable]
  29 pub const API_METHOD_UPGRADE_BACKUP: ApiMethod = ApiMethod::new(
  30     &ApiHandler::AsyncHttp(&upgrade_to_backup_protocol),
  31     &ObjectSchema::new(
  32         concat!("Upgraded to backup protocol ('", PROXMOX_BACKUP_PROTOCOL_ID_V1!(), "')."),
  33         &sorted!([
  34             ("store", false, &DATASTORE_SCHEMA),
  35             ("backup-type", false, &BACKUP_TYPE_SCHEMA),
  36             ("backup-id", false, &BACKUP_ID_SCHEMA),
  37             ("backup-time", false, &BACKUP_TIME_SCHEMA),
  38             ("debug", true, &BooleanSchema::new("Enable verbose debug logging.").schema()),
  39         ]),
  40     )
  41 );
  42
  43 fn upgrade_to_backup_protocol(
  44     parts: Parts,
  45     req_body: Body,
  46     param: Value,
  47     _info: &ApiMethod,
  48     rpcenv: Box<dyn RpcEnvironment>,
  49 ) -> ApiResponseFuture {
  50
  51     async move {
  52     let debug = param["debug"].as_bool().unwrap_or(false);
  53
  54     let store = tools::required_string_param(&param, "store")?.to_owned();
  55     let datastore = DataStore::lookup_datastore(&store)?;
  56
  57     let backup_type = tools::required_string_param(&param, "backup-type")?;
  58     let backup_id = tools::required_string_param(&param, "backup-id")?;
  59     let backup_time = tools::required_integer_param(&param, "backup-time")?;
  60
  61     let protocols = parts
  62         .headers
  63         .get("UPGRADE")
  64         .ok_or_else(|| format_err!("missing Upgrade header"))?
  65         .to_str()?;
  66
  67     if protocols != PROXMOX_BACKUP_PROTOCOL_ID_V1!() {
  68         bail!("invalid protocol name");
  69     }
  70
  71     if parts.version >=  http::version::Version::HTTP_2 {
  72         bail!("unexpected http version '{:?}' (expected version < 2)", parts.version);
  73     }
  74
  75     let worker_id = format!("{}_{}_{}", store, backup_type, backup_id);
  76
  77     let username = rpcenv.get_user().unwrap();
  78     let env_type = rpcenv.env_type();
  79
  80     let backup_group = BackupGroup::new(backup_type, backup_id);
  81     let last_backup = BackupInfo::last_backup(&datastore.base_path(), &backup_group).unwrap_or(None);
  82     let backup_dir = BackupDir::new_with_group(backup_group, backup_time);
  83
  84     if let Some(last) = &last_backup {
  85         if backup_dir.backup_time() <= last.backup_dir.backup_time() {
  86             bail!("backup timestamp is older than last backup.");
  87         }
  88         // fixme: abort if last backup is still running - howto test?
  89         // Idea: write upid into a file inside snapshot dir. then test if
  90         // it is still running here.
  91     }
  92
  93     let (path, is_new) = datastore.create_backup_dir(&backup_dir)?;
  94     if !is_new { bail!("backup directorty already exists."); }
  95
  96     WorkerTask::spawn("backup", Some(worker_id), &username.clone(), true, move |worker| {
  97         let mut env = BackupEnvironment::new(
  98             env_type, username.clone(), worker.clone(), datastore, backup_dir);
  99
 100         env.debug = debug;
 101         env.last_backup = last_backup;
 102
 103         env.log(format!("starting new backup on datastore '{}': {:?}", store, path));
 104
 105         let service = H2Service::new(env.clone(), worker.clone(), &BACKUP_API_ROUTER, debug);
 106
 107         let abort_future = worker.abort_future();
 108
 109         let env2 = env.clone();
 110         let env3 = env.clone();
 111
 112         let req_fut = req_body
 113             .on_upgrade()
 114             .map_err(Error::from)
 115             .and_then(move |conn| {
 116                 env3.debug("protocol upgrade done");
 117
 118                 let mut http = hyper::server::conn::Http::new();
 119                 http.http2_only(true);
 120                 // increase window size: todo - find optiomal size
 121                 let window_size = 32*1024*1024; // max = (1 << 31) - 2
 122                 http.http2_initial_stream_window_size(window_size);
 123                 http.http2_initial_connection_window_size(window_size);
 124
 125                 http.serve_connection(conn, service)
 126                     .map_err(Error::from)
 127             });
 128         let abort_future = abort_future
 129             .map(|_| Err(format_err!("task aborted")));
 130
 131         use futures::future::Either;
 132         future::select(req_fut, abort_future)
 133             .map(|res| match res {
 134                 Either::Left((Ok(res), _)) => Ok(res),
 135                 Either::Left((Err(err), _)) => Err(err),
 136                 Either::Right((Ok(res), _)) => Ok(res),
 137                 Either::Right((Err(err), _)) => Err(err),
 138             })
 139             .and_then(move |_result| async move {
 140                 env.ensure_finished()?;
 141                 env.log("backup finished sucessfully");
 142                 Ok(())
 143             })
 144             .then(move |result| async move {
 145                 if let Err(err) = result {
 146                     match env2.ensure_finished() {
 147                         Ok(()) => {}, // ignore error after finish
 148                         _ => {
 149                             env2.log(format!("backup failed: {}", err));
 150                             env2.log("removing failed backup");
 151                             env2.remove_backup()?;
 152                             return Err(err);
 153                         }
 154                     }
 155                 }
 156                 Ok(())
 157             })
 158     })?;
 159
 160     let response = Response::builder()
 161         .status(StatusCode::SWITCHING_PROTOCOLS)
 162         .header(UPGRADE, HeaderValue::from_static(PROXMOX_BACKUP_PROTOCOL_ID_V1!()))
 163         .body(Body::empty())?;
 164
 165     Ok(response)
 166     }.boxed()
 167 }
 168
 169 pub const BACKUP_API_SUBDIRS: SubdirMap = &[
 170     (
 171         "blob", &Router::new()
 172             .upload(&API_METHOD_UPLOAD_BLOB)
 173     ),
 174     (
 175         "dynamic_chunk", &Router::new()
 176             .upload(&API_METHOD_UPLOAD_DYNAMIC_CHUNK)
 177     ),
 178     (
 179         "dynamic_close", &Router::new()
 180             .post(&API_METHOD_CLOSE_DYNAMIC_INDEX)
 181     ),
 182     (
 183         "dynamic_index", &Router::new()
 184             .download(&API_METHOD_DYNAMIC_CHUNK_INDEX)
 185             .post(&API_METHOD_CREATE_DYNAMIC_INDEX)
 186             .put(&API_METHOD_DYNAMIC_APPEND)
 187     ),
 188     (
 189         "finish", &Router::new()
 190             .post(
 191                 &ApiMethod::new(
 192                     &ApiHandler::Sync(&finish_backup),
 193                     &ObjectSchema::new("Mark backup as finished.", &[])
 194                 )
 195             )
 196     ),
 197     (
 198         "fixed_chunk", &Router::new()
 199             .upload(&API_METHOD_UPLOAD_FIXED_CHUNK)
 200     ),
 201     (
 202         "fixed_close", &Router::new()
 203             .post(&API_METHOD_CLOSE_FIXED_INDEX)
 204     ),
 205     (
 206         "fixed_index", &Router::new()
 207             .download(&API_METHOD_FIXED_CHUNK_INDEX)
 208             .post(&API_METHOD_CREATE_FIXED_INDEX)
 209             .put(&API_METHOD_FIXED_APPEND)
 210     ),
 211     (
 212         "speedtest", &Router::new()
 213             .upload(&API_METHOD_UPLOAD_SPEEDTEST)
 214     ),
 215 ];
 216
 217 pub const BACKUP_API_ROUTER: Router = Router::new()
 218     .get(&list_subdirs_api_method!(BACKUP_API_SUBDIRS))
 219     .subdirs(BACKUP_API_SUBDIRS);
 220
 221 #[sortable]
 222 pub const API_METHOD_CREATE_DYNAMIC_INDEX: ApiMethod = ApiMethod::new(
 223     &ApiHandler::Sync(&create_dynamic_index),
 224     &ObjectSchema::new(
 225         "Create dynamic chunk index file.",
 226         &sorted!([
 227             ("archive-name", false, &crate::api2::types::BACKUP_ARCHIVE_NAME_SCHEMA),
 228         ]),
 229     )
 230 );
 231
 232 fn create_dynamic_index(
 233     param: Value,
 234     _info: &ApiMethod,
 235     rpcenv: &mut dyn RpcEnvironment,
 236 ) -> Result<Value, Error> {
 237
 238     let env: &BackupEnvironment = rpcenv.as_ref();
 239
 240     let name = tools::required_string_param(&param, "archive-name")?.to_owned();
 241
 242     let archive_name = name.clone();
 243     if !archive_name.ends_with(".didx") {
 244         bail!("wrong archive extension: '{}'", archive_name);
 245     }
 246
 247     let mut path = env.backup_dir.relative_path();
 248     path.push(archive_name);
 249
 250     let index = env.datastore.create_dynamic_writer(&path)?;
 251     let wid = env.register_dynamic_writer(index, name)?;
 252
 253     env.log(format!("created new dynamic index {} ({:?})", wid, path));
 254
 255     Ok(json!(wid))
 256 }
 257
 258 #[sortable]
 259 pub const API_METHOD_CREATE_FIXED_INDEX: ApiMethod = ApiMethod::new(
 260     &ApiHandler::Sync(&create_fixed_index),
 261     &ObjectSchema::new(
 262         "Create fixed chunk index file.",
 263         &sorted!([
 264             ("archive-name", false, &crate::api2::types::BACKUP_ARCHIVE_NAME_SCHEMA),
 265             ("size", false, &IntegerSchema::new("File size.")
 266              .minimum(1)
 267              .schema()
 268             ),
 269         ]),
 270     )
 271 );
 272
 273 fn create_fixed_index(
 274     param: Value,
 275     _info: &ApiMethod,
 276     rpcenv: &mut dyn RpcEnvironment,
 277 ) -> Result<Value, Error> {
 278
 279     let env: &BackupEnvironment = rpcenv.as_ref();
 280
 281     println!("PARAM: {:?}", param);
 282
 283     let name = tools::required_string_param(&param, "archive-name")?.to_owned();
 284     let size = tools::required_integer_param(&param, "size")? as usize;
 285
 286     let archive_name = name.clone();
 287     if !archive_name.ends_with(".fidx") {
 288         bail!("wrong archive extension: '{}'", archive_name);
 289     }
 290
 291     let mut path = env.backup_dir.relative_path();
 292     path.push(archive_name);
 293
 294     let chunk_size = 4096*1024; // todo: ??
 295
 296     let index = env.datastore.create_fixed_writer(&path, size, chunk_size)?;
 297     let wid = env.register_fixed_writer(index, name, size, chunk_size as u32)?;
 298
 299     env.log(format!("created new fixed index {} ({:?})", wid, path));
 300
 301     Ok(json!(wid))
 302 }
 303
 304 #[sortable]
 305 pub const API_METHOD_DYNAMIC_APPEND: ApiMethod = ApiMethod::new(
 306     &ApiHandler::Sync(&dynamic_append),
 307     &ObjectSchema::new(
 308         "Append chunk to dynamic index writer.",
 309         &sorted!([
 310             (
 311                 "wid",
 312                 false,
 313                 &IntegerSchema::new("Dynamic writer ID.")
 314                     .minimum(1)
 315                     .maximum(256)
 316                     .schema()
 317             ),
 318             (
 319                 "digest-list",
 320                 false,
 321                 &ArraySchema::new("Chunk digest list.", &CHUNK_DIGEST_SCHEMA).schema()
 322             ),
 323             (
 324                 "offset-list",
 325                 false,
 326                 &ArraySchema::new(
 327                     "Chunk offset list.",
 328                     &IntegerSchema::new("Corresponding chunk offsets.")
 329                         .minimum(0)
 330                         .schema()
 331                 ).schema()
 332             ),
 333         ]),
 334     )
 335 );
 336
 337 fn dynamic_append (
 338     param: Value,
 339     _info: &ApiMethod,
 340     rpcenv: &mut dyn RpcEnvironment,
 341 ) -> Result<Value, Error> {
 342
 343     let wid = tools::required_integer_param(&param, "wid")? as usize;
 344     let digest_list = tools::required_array_param(&param, "digest-list")?;
 345     let offset_list = tools::required_array_param(&param, "offset-list")?;
 346
 347     if offset_list.len() != digest_list.len() {
 348         bail!("offset list has wrong length ({} != {})", offset_list.len(), digest_list.len());
 349     }
 350
 351     let env: &BackupEnvironment = rpcenv.as_ref();
 352
 353     env.debug(format!("dynamic_append {} chunks", digest_list.len()));
 354
 355     for (i, item) in digest_list.iter().enumerate() {
 356         let digest_str = item.as_str().unwrap();
 357         let digest = proxmox::tools::hex_to_digest(digest_str)?;
 358         let offset = offset_list[i].as_u64().unwrap();
 359         let size = env.lookup_chunk(&digest).ok_or_else(|| format_err!("no such chunk {}", digest_str))?;
 360
 361         env.dynamic_writer_append_chunk(wid, offset, size, &digest)?;
 362
 363         env.debug(format!("sucessfully added chunk {} to dynamic index {} (offset {}, size {})", digest_str, wid, offset, size));
 364     }
 365
 366     Ok(Value::Null)
 367 }
 368
 369 #[sortable]
 370 pub const API_METHOD_FIXED_APPEND: ApiMethod = ApiMethod::new(
 371     &ApiHandler::Sync(&fixed_append),
 372     &ObjectSchema::new(
 373         "Append chunk to fixed index writer.",
 374         &sorted!([
 375             (
 376                 "wid",
 377                 false,
 378                 &IntegerSchema::new("Fixed writer ID.")
 379                     .minimum(1)
 380                     .maximum(256)
 381                     .schema()
 382             ),
 383             (
 384                 "digest-list",
 385                 false,
 386                 &ArraySchema::new("Chunk digest list.", &CHUNK_DIGEST_SCHEMA).schema()
 387             ),
 388             (
 389                 "offset-list",
 390                 false,
 391                 &ArraySchema::new(
 392                     "Chunk offset list.",
 393                     &IntegerSchema::new("Corresponding chunk offsets.")
 394                         .minimum(0)
 395                         .schema()
 396                 ).schema()
 397             )
 398         ]),
 399     )
 400 );
 401
 402 fn fixed_append (
 403     param: Value,
 404     _info: &ApiMethod,
 405     rpcenv: &mut dyn RpcEnvironment,
 406 ) -> Result<Value, Error> {
 407
 408     let wid = tools::required_integer_param(&param, "wid")? as usize;
 409     let digest_list = tools::required_array_param(&param, "digest-list")?;
 410     let offset_list = tools::required_array_param(&param, "offset-list")?;
 411
 412     if offset_list.len() != digest_list.len() {
 413         bail!("offset list has wrong length ({} != {})", offset_list.len(), digest_list.len());
 414     }
 415
 416     let env: &BackupEnvironment = rpcenv.as_ref();
 417
 418     env.debug(format!("fixed_append {} chunks", digest_list.len()));
 419
 420     for (i, item) in digest_list.iter().enumerate() {
 421         let digest_str = item.as_str().unwrap();
 422         let digest = proxmox::tools::hex_to_digest(digest_str)?;
 423         let offset = offset_list[i].as_u64().unwrap();
 424         let size = env.lookup_chunk(&digest).ok_or_else(|| format_err!("no such chunk {}", digest_str))?;
 425
 426         env.fixed_writer_append_chunk(wid, offset, size, &digest)?;
 427
 428         env.debug(format!("sucessfully added chunk {} to fixed index {} (offset {}, size {})", digest_str, wid, offset, size));
 429     }
 430
 431     Ok(Value::Null)
 432 }
 433
 434 #[sortable]
 435 pub const API_METHOD_CLOSE_DYNAMIC_INDEX: ApiMethod = ApiMethod::new(
 436     &ApiHandler::Sync(&close_dynamic_index),
 437     &ObjectSchema::new(
 438         "Close dynamic index writer.",
 439         &sorted!([
 440             (
 441                 "wid",
 442                 false,
 443                 &IntegerSchema::new("Dynamic writer ID.")
 444                     .minimum(1)
 445                     .maximum(256)
 446                     .schema()
 447             ),
 448             (
 449                 "chunk-count",
 450                 false,
 451                 &IntegerSchema::new("Chunk count. This is used to verify that the server got all chunks.")
 452                     .minimum(1)
 453                     .schema()
 454             ),
 455             (
 456                 "size",
 457                 false,
 458                 &IntegerSchema::new("File size. This is used to verify that the server got all data.")
 459                     .minimum(1)
 460                     .schema()
 461             ),
 462             ("csum", false, &StringSchema::new("Digest list checksum.").schema()),
 463         ]),
 464     )
 465 );
 466
 467 fn close_dynamic_index (
 468     param: Value,
 469     _info: &ApiMethod,
 470     rpcenv: &mut dyn RpcEnvironment,
 471 ) -> Result<Value, Error> {
 472
 473     let wid = tools::required_integer_param(&param, "wid")? as usize;
 474     let chunk_count = tools::required_integer_param(&param, "chunk-count")? as u64;
 475     let size = tools::required_integer_param(&param, "size")? as u64;
 476     let csum_str = tools::required_string_param(&param, "csum")?;
 477     let csum = proxmox::tools::hex_to_digest(csum_str)?;
 478
 479     let env: &BackupEnvironment = rpcenv.as_ref();
 480
 481     env.dynamic_writer_close(wid, chunk_count, size, csum)?;
 482
 483     env.log(format!("sucessfully closed dynamic index {}", wid));
 484
 485     Ok(Value::Null)
 486 }
 487
 488 #[sortable]
 489 pub const API_METHOD_CLOSE_FIXED_INDEX: ApiMethod = ApiMethod::new(
 490     &ApiHandler::Sync(&close_fixed_index),
 491     &ObjectSchema::new(
 492         "Close fixed index writer.",
 493         &sorted!([
 494             (
 495                 "wid",
 496                 false,
 497                 &IntegerSchema::new("Fixed writer ID.")
 498                     .minimum(1)
 499                     .maximum(256)
 500                     .schema()
 501             ),
 502             (
 503                 "chunk-count",
 504                 false,
 505                 &IntegerSchema::new("Chunk count. This is used to verify that the server got all chunks.")
 506                     .minimum(1)
 507                     .schema()
 508             ),
 509             (
 510                 "size",
 511                 false,
 512                 &IntegerSchema::new("File size. This is used to verify that the server got all data.")
 513                     .minimum(1)
 514                     .schema()
 515             ),
 516             ("csum", false, &StringSchema::new("Digest list checksum.").schema()),
 517         ]),
 518     )
 519 );
 520
 521 fn close_fixed_index (
 522     param: Value,
 523     _info: &ApiMethod,
 524     rpcenv: &mut dyn RpcEnvironment,
 525 ) -> Result<Value, Error> {
 526
 527     let wid = tools::required_integer_param(&param, "wid")? as usize;
 528     let chunk_count = tools::required_integer_param(&param, "chunk-count")? as u64;
 529     let size = tools::required_integer_param(&param, "size")? as u64;
 530     let csum_str = tools::required_string_param(&param, "csum")?;
 531     let csum = proxmox::tools::hex_to_digest(csum_str)?;
 532
 533     let env: &BackupEnvironment = rpcenv.as_ref();
 534
 535     env.fixed_writer_close(wid, chunk_count, size, csum)?;
 536
 537     env.log(format!("sucessfully closed fixed index {}", wid));
 538
 539     Ok(Value::Null)
 540 }
 541
 542 fn finish_backup (
 543     _param: Value,
 544     _info: &ApiMethod,
 545     rpcenv: &mut dyn RpcEnvironment,
 546 ) -> Result<Value, Error> {
 547
 548     let env: &BackupEnvironment = rpcenv.as_ref();
 549
 550     env.finish_backup()?;
 551     env.log("sucessfully finished backup");
 552
 553     Ok(Value::Null)
 554 }
 555
 556 #[sortable]
 557 pub const API_METHOD_DYNAMIC_CHUNK_INDEX: ApiMethod = ApiMethod::new(
 558     &ApiHandler::AsyncHttp(&dynamic_chunk_index),
 559     &ObjectSchema::new(
 560         r###"
 561 Download the dynamic chunk index from the previous backup.
 562 Simply returns an empty list if this is the first backup.
 563 "### ,
 564         &sorted!([
 565             ("archive-name", false, &crate::api2::types::BACKUP_ARCHIVE_NAME_SCHEMA)
 566         ]),
 567     )
 568 );
 569
 570 fn dynamic_chunk_index(
 571     _parts: Parts,
 572     _req_body: Body,
 573     param: Value,
 574     _info: &ApiMethod,
 575     rpcenv: Box<dyn RpcEnvironment>,
 576 ) -> ApiResponseFuture {
 577
 578     async move {
 579         let env: &BackupEnvironment = rpcenv.as_ref();
 580
 581         let archive_name = tools::required_string_param(&param, "archive-name")?.to_owned();
 582
 583         if !archive_name.ends_with(".didx") {
 584             bail!("wrong archive extension: '{}'", archive_name);
 585         }
 586
 587         let empty_response = {
 588             Response::builder()
 589                 .status(StatusCode::OK)
 590                 .body(Body::empty())?
 591         };
 592
 593         let last_backup = match &env.last_backup {
 594             Some(info) => info,
 595             None => return Ok(empty_response),
 596         };
 597
 598         let mut path = last_backup.backup_dir.relative_path();
 599         path.push(&archive_name);
 600
 601         let index = match env.datastore.open_dynamic_reader(path) {
 602             Ok(index) => index,
 603             Err(_) => {
 604                 env.log(format!("there is no last backup for archive '{}'", archive_name));
 605                 return Ok(empty_response);
 606             }
 607         };
 608
 609         env.log(format!("download last backup index for archive '{}'", archive_name));
 610
 611         let count = index.index_count();
 612         for pos in 0..count {
 613             let (start, end, digest) = index.chunk_info(pos)?;
 614             let size = (end - start) as u32;
 615             env.register_chunk(digest, size)?;
 616         }
 617
 618         let reader = DigestListEncoder::new(Box::new(index));
 619
 620         let stream = WrappedReaderStream::new(reader);
 621
 622         // fixme: set size, content type?
 623         let response = http::Response::builder()
 624             .status(200)
 625             .body(Body::wrap_stream(stream))?;
 626
 627         Ok(response)
 628     }.boxed()
 629 }
 630
 631 #[sortable]
 632 pub const API_METHOD_FIXED_CHUNK_INDEX: ApiMethod = ApiMethod::new(
 633     &ApiHandler::AsyncHttp(&fixed_chunk_index),
 634     &ObjectSchema::new(
 635         r###"
 636 Download the fixed chunk index from the previous backup.
 637 Simply returns an empty list if this is the first backup.
 638 "### ,
 639         &sorted!([
 640             ("archive-name", false, &crate::api2::types::BACKUP_ARCHIVE_NAME_SCHEMA)
 641         ]),
 642     )
 643 );
 644
 645 fn fixed_chunk_index(
 646     _parts: Parts,
 647     _req_body: Body,
 648     param: Value,
 649     _info: &ApiMethod,
 650     rpcenv: Box<dyn RpcEnvironment>,
 651 ) -> ApiResponseFuture {
 652
 653     async move {
 654         let env: &BackupEnvironment = rpcenv.as_ref();
 655
 656         let archive_name = tools::required_string_param(&param, "archive-name")?.to_owned();
 657
 658         if !archive_name.ends_with(".fidx") {
 659             bail!("wrong archive extension: '{}'", archive_name);
 660         }
 661
 662         let empty_response = {
 663             Response::builder()
 664                 .status(StatusCode::OK)
 665                 .body(Body::empty())?
 666         };
 667
 668         let last_backup = match &env.last_backup {
 669             Some(info) => info,
 670             None => return Ok(empty_response),
 671         };
 672
 673         let mut path = last_backup.backup_dir.relative_path();
 674         path.push(&archive_name);
 675
 676         let index = match env.datastore.open_fixed_reader(path) {
 677             Ok(index) => index,
 678             Err(_) => {
 679                 env.log(format!("there is no last backup for archive '{}'", archive_name));
 680                 return Ok(empty_response);
 681             }
 682         };
 683
 684         env.log(format!("download last backup index for archive '{}'", archive_name));
 685
 686         let count = index.index_count();
 687         let image_size = index.index_bytes();
 688         for pos in 0..count {
 689             let digest = index.index_digest(pos).unwrap();
 690             // Note: last chunk can be smaller
 691             let start = (pos*index.chunk_size) as u64;
 692             let mut end = start + index.chunk_size as u64;
 693             if end > image_size { end = image_size; }
 694             let size = (end - start) as u32;
 695             env.register_chunk(*digest, size)?;
 696         }
 697
 698         let reader = DigestListEncoder::new(Box::new(index));
 699
 700         let stream = WrappedReaderStream::new(reader);
 701
 702         // fixme: set size, content type?
 703         let response = http::Response::builder()
 704             .status(200)
 705             .body(Body::wrap_stream(stream))?;
 706
 707         Ok(response)
 708     }.boxed()
 709 }