Line data Source code
1 : //! Azure Blob Storage wrapper
2 :
3 : use std::borrow::Cow;
4 : use std::collections::HashMap;
5 : use std::env;
6 : use std::num::NonZeroU32;
7 : use std::pin::Pin;
8 : use std::str::FromStr;
9 : use std::sync::Arc;
10 : use std::time::Duration;
11 : use std::time::SystemTime;
12 :
13 : use super::REMOTE_STORAGE_PREFIX_SEPARATOR;
14 : use anyhow::Result;
15 : use azure_core::request_options::{MaxResults, Metadata, Range};
16 : use azure_core::RetryOptions;
17 : use azure_identity::DefaultAzureCredential;
18 : use azure_storage::StorageCredentials;
19 : use azure_storage_blobs::blob::CopyStatus;
20 : use azure_storage_blobs::prelude::ClientBuilder;
21 : use azure_storage_blobs::{blob::operations::GetBlobBuilder, prelude::ContainerClient};
22 : use bytes::Bytes;
23 : use futures::stream::Stream;
24 : use futures_util::StreamExt;
25 : use futures_util::TryStreamExt;
26 : use http_types::{StatusCode, Url};
27 : use tokio_util::sync::CancellationToken;
28 : use tracing::debug;
29 :
30 : use crate::{
31 : error::Cancelled, s3_bucket::RequestKind, AzureConfig, ConcurrencyLimiter, Download,
32 : DownloadError, Listing, ListingMode, RemotePath, RemoteStorage, StorageMetadata,
33 : TimeTravelError, TimeoutOrCancel,
34 : };
35 :
36 : pub struct AzureBlobStorage {
37 : client: ContainerClient,
38 : prefix_in_container: Option<String>,
39 : max_keys_per_list_response: Option<NonZeroU32>,
40 : concurrency_limiter: ConcurrencyLimiter,
41 : // Per-request timeout. Accessible for tests.
42 : pub timeout: Duration,
43 : }
44 :
45 : impl AzureBlobStorage {
46 6 : pub fn new(azure_config: &AzureConfig, timeout: Duration) -> Result<Self> {
47 6 : debug!(
48 0 : "Creating azure remote storage for azure container {}",
49 0 : azure_config.container_name
50 0 : );
51 :
52 6 : let account = env::var("AZURE_STORAGE_ACCOUNT").expect("missing AZURE_STORAGE_ACCOUNT");
53 :
54 : // If the `AZURE_STORAGE_ACCESS_KEY` env var has an access key, use that,
55 : // otherwise try the token based credentials.
56 6 : let credentials = if let Ok(access_key) = env::var("AZURE_STORAGE_ACCESS_KEY") {
57 6 : StorageCredentials::access_key(account.clone(), access_key)
58 : } else {
59 0 : let token_credential = DefaultAzureCredential::default();
60 0 : StorageCredentials::token_credential(Arc::new(token_credential))
61 : };
62 :
63 : // we have an outer retry
64 6 : let builder = ClientBuilder::new(account, credentials).retry(RetryOptions::none());
65 6 :
66 6 : let client = builder.container_client(azure_config.container_name.to_owned());
67 :
68 6 : let max_keys_per_list_response =
69 6 : if let Some(limit) = azure_config.max_keys_per_list_response {
70 : Some(
71 2 : NonZeroU32::new(limit as u32)
72 2 : .ok_or_else(|| anyhow::anyhow!("max_keys_per_list_response can't be 0"))?,
73 : )
74 : } else {
75 4 : None
76 : };
77 :
78 6 : Ok(AzureBlobStorage {
79 6 : client,
80 6 : prefix_in_container: azure_config.prefix_in_container.to_owned(),
81 6 : max_keys_per_list_response,
82 6 : concurrency_limiter: ConcurrencyLimiter::new(azure_config.concurrency_limit.get()),
83 6 : timeout,
84 6 : })
85 6 : }
86 :
87 107 : pub fn relative_path_to_name(&self, path: &RemotePath) -> String {
88 107 : assert_eq!(std::path::MAIN_SEPARATOR, REMOTE_STORAGE_PREFIX_SEPARATOR);
89 107 : let path_string = path
90 107 : .get_path()
91 107 : .as_str()
92 107 : .trim_end_matches(REMOTE_STORAGE_PREFIX_SEPARATOR);
93 107 : match &self.prefix_in_container {
94 107 : Some(prefix) => {
95 107 : if prefix.ends_with(REMOTE_STORAGE_PREFIX_SEPARATOR) {
96 107 : prefix.clone() + path_string
97 : } else {
98 0 : format!("{prefix}{REMOTE_STORAGE_PREFIX_SEPARATOR}{path_string}")
99 : }
100 : }
101 0 : None => path_string.to_string(),
102 : }
103 107 : }
104 :
105 53 : fn name_to_relative_path(&self, key: &str) -> RemotePath {
106 53 : let relative_path =
107 53 : match key.strip_prefix(self.prefix_in_container.as_deref().unwrap_or_default()) {
108 53 : Some(stripped) => stripped,
109 : // we rely on Azure to return properly prefixed paths
110 : // for requests with a certain prefix
111 0 : None => panic!(
112 0 : "Key {key} does not start with container prefix {:?}",
113 0 : self.prefix_in_container
114 0 : ),
115 : };
116 53 : RemotePath(
117 53 : relative_path
118 53 : .split(REMOTE_STORAGE_PREFIX_SEPARATOR)
119 53 : .collect(),
120 53 : )
121 53 : }
122 :
123 7 : async fn download_for_builder(
124 7 : &self,
125 7 : builder: GetBlobBuilder,
126 7 : cancel: &CancellationToken,
127 7 : ) -> Result<Download, DownloadError> {
128 0 : let kind = RequestKind::Get;
129 :
130 0 : let _permit = self.permit(kind, cancel).await?;
131 :
132 0 : let mut etag = None;
133 0 : let mut last_modified = None;
134 0 : let mut metadata = HashMap::new();
135 0 : // TODO give proper streaming response instead of buffering into RAM
136 0 : // https://github.com/neondatabase/neon/issues/5563
137 0 :
138 0 : let download = async {
139 0 : let response = builder
140 0 : // convert to concrete Pageable
141 0 : .into_stream()
142 0 : // convert to TryStream
143 0 : .into_stream()
144 0 : .map_err(to_download_error);
145 0 :
146 0 : // apply per request timeout
147 0 : let response = tokio_stream::StreamExt::timeout(response, self.timeout);
148 0 :
149 0 : // flatten
150 0 : let response = response.map(|res| match res {
151 0 : Ok(res) => res,
152 0 : Err(_elapsed) => Err(DownloadError::Timeout),
153 0 : });
154 0 :
155 0 : let mut response = std::pin::pin!(response);
156 0 :
157 0 : let mut bufs = Vec::new();
158 0 : while let Some(part) = response.next().await {
159 0 : let part = part?;
160 0 : if etag.is_none() {
161 0 : etag = Some(part.blob.properties.etag);
162 0 : }
163 0 : if last_modified.is_none() {
164 0 : last_modified = Some(part.blob.properties.last_modified.into());
165 0 : }
166 0 : if let Some(blob_meta) = part.blob.metadata {
167 0 : metadata.extend(blob_meta.iter().map(|(k, v)| (k.to_owned(), v.to_owned())));
168 0 : }
169 0 : let data = part
170 0 : .data
171 0 : .collect()
172 0 : .await
173 0 : .map_err(|e| DownloadError::Other(e.into()))?;
174 0 : bufs.push(data);
175 : }
176 :
177 0 : if bufs.is_empty() {
178 0 : return Err(DownloadError::Other(anyhow::anyhow!(
179 0 : "Azure GET response contained no buffers"
180 0 : )));
181 0 : }
182 0 : // unwrap safety: if these were None, bufs would be empty and we would have returned an error already
183 0 : let etag = etag.unwrap();
184 0 : let last_modified = last_modified.unwrap();
185 0 :
186 0 : Ok(Download {
187 0 : download_stream: Box::pin(futures::stream::iter(bufs.into_iter().map(Ok))),
188 0 : etag,
189 0 : last_modified,
190 0 : metadata: Some(StorageMetadata(metadata)),
191 0 : })
192 0 : };
193 :
194 0 : tokio::select! {
195 0 : bufs = download => bufs,
196 : _ = cancel.cancelled() => Err(DownloadError::Cancelled),
197 : }
198 0 : }
199 :
200 108 : async fn permit(
201 108 : &self,
202 108 : kind: RequestKind,
203 108 : cancel: &CancellationToken,
204 108 : ) -> Result<tokio::sync::SemaphorePermit<'_>, Cancelled> {
205 0 : let acquire = self.concurrency_limiter.acquire(kind);
206 :
207 0 : tokio::select! {
208 0 : permit = acquire => Ok(permit.expect("never closed")),
209 : _ = cancel.cancelled() => Err(Cancelled),
210 : }
211 0 : }
212 : }
213 :
214 0 : fn to_azure_metadata(metadata: StorageMetadata) -> Metadata {
215 0 : let mut res = Metadata::new();
216 0 : for (k, v) in metadata.0.into_iter() {
217 0 : res.insert(k, v);
218 0 : }
219 0 : res
220 0 : }
221 :
222 0 : fn to_download_error(error: azure_core::Error) -> DownloadError {
223 0 : if let Some(http_err) = error.as_http_error() {
224 0 : match http_err.status() {
225 0 : StatusCode::NotFound => DownloadError::NotFound,
226 0 : StatusCode::BadRequest => DownloadError::BadInput(anyhow::Error::new(error)),
227 0 : _ => DownloadError::Other(anyhow::Error::new(error)),
228 : }
229 : } else {
230 0 : DownloadError::Other(error.into())
231 : }
232 0 : }
233 :
234 : impl RemoteStorage for AzureBlobStorage {
235 6 : async fn list(
236 6 : &self,
237 6 : prefix: Option<&RemotePath>,
238 6 : mode: ListingMode,
239 6 : max_keys: Option<NonZeroU32>,
240 6 : cancel: &CancellationToken,
241 6 : ) -> anyhow::Result<Listing, DownloadError> {
242 0 : let _permit = self.permit(RequestKind::List, cancel).await?;
243 :
244 0 : let op = async {
245 0 : // get the passed prefix or if it is not set use prefix_in_bucket value
246 0 : let list_prefix = prefix
247 0 : .map(|p| self.relative_path_to_name(p))
248 0 : .or_else(|| self.prefix_in_container.clone())
249 0 : .map(|mut p| {
250 : // required to end with a separator
251 : // otherwise request will return only the entry of a prefix
252 0 : if matches!(mode, ListingMode::WithDelimiter)
253 0 : && !p.ends_with(REMOTE_STORAGE_PREFIX_SEPARATOR)
254 0 : {
255 0 : p.push(REMOTE_STORAGE_PREFIX_SEPARATOR);
256 0 : }
257 0 : p
258 0 : });
259 0 :
260 0 : let mut builder = self.client.list_blobs();
261 0 :
262 0 : if let ListingMode::WithDelimiter = mode {
263 0 : builder = builder.delimiter(REMOTE_STORAGE_PREFIX_SEPARATOR.to_string());
264 0 : }
265 :
266 0 : if let Some(prefix) = list_prefix {
267 0 : builder = builder.prefix(Cow::from(prefix.to_owned()));
268 0 : }
269 :
270 0 : if let Some(limit) = self.max_keys_per_list_response {
271 0 : builder = builder.max_results(MaxResults::new(limit));
272 0 : }
273 :
274 0 : let response = builder.into_stream();
275 0 : let response = response.into_stream().map_err(to_download_error);
276 0 : let response = tokio_stream::StreamExt::timeout(response, self.timeout);
277 0 : let response = response.map(|res| match res {
278 0 : Ok(res) => res,
279 0 : Err(_elapsed) => Err(DownloadError::Timeout),
280 0 : });
281 0 :
282 0 : let mut response = std::pin::pin!(response);
283 0 :
284 0 : let mut res = Listing::default();
285 0 :
286 0 : let mut max_keys = max_keys.map(|mk| mk.get());
287 0 : while let Some(entry) = response.next().await {
288 0 : let entry = entry?;
289 0 : let prefix_iter = entry
290 0 : .blobs
291 0 : .prefixes()
292 0 : .map(|prefix| self.name_to_relative_path(&prefix.name));
293 0 : res.prefixes.extend(prefix_iter);
294 0 :
295 0 : let blob_iter = entry
296 0 : .blobs
297 0 : .blobs()
298 0 : .map(|k| self.name_to_relative_path(&k.name));
299 :
300 0 : for key in blob_iter {
301 0 : res.keys.push(key);
302 :
303 0 : if let Some(mut mk) = max_keys {
304 0 : assert!(mk > 0);
305 0 : mk -= 1;
306 0 : if mk == 0 {
307 0 : return Ok(res); // limit reached
308 0 : }
309 0 : max_keys = Some(mk);
310 0 : }
311 : }
312 : }
313 :
314 0 : Ok(res)
315 0 : };
316 :
317 0 : tokio::select! {
318 0 : res = op => res,
319 : _ = cancel.cancelled() => Err(DownloadError::Cancelled),
320 : }
321 0 : }
322 :
323 0 : async fn upload(
324 0 : &self,
325 0 : from: impl Stream<Item = std::io::Result<Bytes>> + Send + Sync + 'static,
326 0 : data_size_bytes: usize,
327 0 : to: &RemotePath,
328 0 : metadata: Option<StorageMetadata>,
329 0 : cancel: &CancellationToken,
330 0 : ) -> anyhow::Result<()> {
331 0 : let _permit = self.permit(RequestKind::Put, cancel).await?;
332 :
333 0 : let op = async {
334 0 : let blob_client = self.client.blob_client(self.relative_path_to_name(to));
335 0 :
336 0 : let from: Pin<Box<dyn Stream<Item = std::io::Result<Bytes>> + Send + Sync + 'static>> =
337 0 : Box::pin(from);
338 0 :
339 0 : let from = NonSeekableStream::new(from, data_size_bytes);
340 0 :
341 0 : let body = azure_core::Body::SeekableStream(Box::new(from));
342 0 :
343 0 : let mut builder = blob_client.put_block_blob(body);
344 :
345 0 : if let Some(metadata) = metadata {
346 0 : builder = builder.metadata(to_azure_metadata(metadata));
347 0 : }
348 :
349 0 : let fut = builder.into_future();
350 0 : let fut = tokio::time::timeout(self.timeout, fut);
351 0 :
352 0 : match fut.await {
353 0 : Ok(Ok(_response)) => Ok(()),
354 0 : Ok(Err(azure)) => Err(azure.into()),
355 0 : Err(_timeout) => Err(TimeoutOrCancel::Cancel.into()),
356 : }
357 0 : };
358 :
359 0 : tokio::select! {
360 0 : res = op => res,
361 : _ = cancel.cancelled() => Err(TimeoutOrCancel::Cancel.into()),
362 : }
363 0 : }
364 :
365 2 : async fn download(
366 2 : &self,
367 2 : from: &RemotePath,
368 2 : cancel: &CancellationToken,
369 2 : ) -> Result<Download, DownloadError> {
370 0 : let blob_client = self.client.blob_client(self.relative_path_to_name(from));
371 0 :
372 0 : let builder = blob_client.get();
373 0 :
374 0 : self.download_for_builder(builder, cancel).await
375 0 : }
376 :
377 5 : async fn download_byte_range(
378 5 : &self,
379 5 : from: &RemotePath,
380 5 : start_inclusive: u64,
381 5 : end_exclusive: Option<u64>,
382 5 : cancel: &CancellationToken,
383 5 : ) -> Result<Download, DownloadError> {
384 0 : let blob_client = self.client.blob_client(self.relative_path_to_name(from));
385 0 :
386 0 : let mut builder = blob_client.get();
387 :
388 0 : let range: Range = if let Some(end_exclusive) = end_exclusive {
389 0 : (start_inclusive..end_exclusive).into()
390 : } else {
391 0 : (start_inclusive..).into()
392 : };
393 0 : builder = builder.range(range);
394 0 :
395 0 : self.download_for_builder(builder, cancel).await
396 0 : }
397 :
398 44 : async fn delete(&self, path: &RemotePath, cancel: &CancellationToken) -> anyhow::Result<()> {
399 0 : self.delete_objects(std::array::from_ref(path), cancel)
400 0 : .await
401 0 : }
402 :
403 47 : async fn delete_objects<'a>(
404 47 : &self,
405 47 : paths: &'a [RemotePath],
406 47 : cancel: &CancellationToken,
407 47 : ) -> anyhow::Result<()> {
408 0 : let _permit = self.permit(RequestKind::Delete, cancel).await?;
409 :
410 0 : let op = async {
411 : // TODO batch requests are also not supported by the SDK
412 : // https://github.com/Azure/azure-sdk-for-rust/issues/1068
413 : // https://github.com/Azure/azure-sdk-for-rust/issues/1249
414 0 : for path in paths {
415 0 : let blob_client = self.client.blob_client(self.relative_path_to_name(path));
416 0 :
417 0 : let request = blob_client.delete().into_future();
418 :
419 0 : let res = tokio::time::timeout(self.timeout, request).await;
420 :
421 0 : match res {
422 0 : Ok(Ok(_response)) => continue,
423 0 : Ok(Err(e)) => {
424 0 : if let Some(http_err) = e.as_http_error() {
425 0 : if http_err.status() == StatusCode::NotFound {
426 0 : continue;
427 0 : }
428 0 : }
429 0 : return Err(e.into());
430 : }
431 0 : Err(_elapsed) => return Err(TimeoutOrCancel::Timeout.into()),
432 : }
433 : }
434 :
435 0 : Ok(())
436 0 : };
437 :
438 0 : tokio::select! {
439 0 : res = op => res,
440 : _ = cancel.cancelled() => Err(TimeoutOrCancel::Cancel.into()),
441 : }
442 0 : }
443 :
444 1 : async fn copy(
445 1 : &self,
446 1 : from: &RemotePath,
447 1 : to: &RemotePath,
448 1 : cancel: &CancellationToken,
449 1 : ) -> anyhow::Result<()> {
450 0 : let _permit = self.permit(RequestKind::Copy, cancel).await?;
451 :
452 0 : let timeout = tokio::time::sleep(self.timeout);
453 0 :
454 0 : let mut copy_status = None;
455 0 :
456 0 : let op = async {
457 0 : let blob_client = self.client.blob_client(self.relative_path_to_name(to));
458 :
459 0 : let source_url = format!(
460 0 : "{}/{}",
461 0 : self.client.url()?,
462 0 : self.relative_path_to_name(from)
463 : );
464 :
465 0 : let builder = blob_client.copy(Url::from_str(&source_url)?);
466 0 : let copy = builder.into_future();
467 :
468 0 : let result = copy.await?;
469 :
470 0 : copy_status = Some(result.copy_status);
471 : loop {
472 0 : match copy_status.as_ref().expect("we always set it to Some") {
473 : CopyStatus::Aborted => {
474 0 : anyhow::bail!("Received abort for copy from {from} to {to}.");
475 : }
476 : CopyStatus::Failed => {
477 0 : anyhow::bail!("Received failure response for copy from {from} to {to}.");
478 : }
479 0 : CopyStatus::Success => return Ok(()),
480 0 : CopyStatus::Pending => (),
481 0 : }
482 0 : // The copy is taking longer. Waiting a second and then re-trying.
483 0 : // TODO estimate time based on copy_progress and adjust time based on that
484 0 : tokio::time::sleep(Duration::from_millis(1000)).await;
485 0 : let properties = blob_client.get_properties().into_future().await?;
486 0 : let Some(status) = properties.blob.properties.copy_status else {
487 0 : tracing::warn!("copy_status for copy is None!, from={from}, to={to}");
488 0 : return Ok(());
489 : };
490 0 : copy_status = Some(status);
491 : }
492 0 : };
493 :
494 0 : tokio::select! {
495 0 : res = op => res,
496 : _ = cancel.cancelled() => Err(anyhow::Error::new(TimeoutOrCancel::Cancel)),
497 : _ = timeout => {
498 : let e = anyhow::Error::new(TimeoutOrCancel::Timeout);
499 : let e = e.context(format!("Timeout, last status: {copy_status:?}"));
500 : Err(e)
501 : },
502 : }
503 0 : }
504 :
505 0 : async fn time_travel_recover(
506 0 : &self,
507 0 : _prefix: Option<&RemotePath>,
508 0 : _timestamp: SystemTime,
509 0 : _done_if_after: SystemTime,
510 0 : _cancel: &CancellationToken,
511 0 : ) -> Result<(), TimeTravelError> {
512 0 : // TODO use Azure point in time recovery feature for this
513 0 : // https://learn.microsoft.com/en-us/azure/storage/blobs/point-in-time-restore-overview
514 0 : Err(TimeTravelError::Unimplemented)
515 0 : }
516 : }
517 :
518 : pin_project_lite::pin_project! {
519 : /// Hack to work around not being able to stream once with azure sdk.
520 : ///
521 : /// Azure sdk clones streams around with the assumption that they are like
522 : /// `Arc<tokio::fs::File>` (except not supporting tokio), however our streams are not like
523 : /// that. For example for an `index_part.json` we just have a single chunk of [`Bytes`]
524 : /// representing the whole serialized vec. It could be trivially cloneable and "semi-trivially"
525 : /// seekable, but we can also just re-try the request easier.
526 : #[project = NonSeekableStreamProj]
527 : enum NonSeekableStream<S> {
528 : /// A stream wrappers initial form.
529 : ///
530 : /// Mutex exists to allow moving when cloning. If the sdk changes to do less than 1
531 : /// clone before first request, then this must be changed.
532 : Initial {
533 : inner: std::sync::Mutex<Option<tokio_util::compat::Compat<tokio_util::io::StreamReader<S, Bytes>>>>,
534 : len: usize,
535 : },
536 : /// The actually readable variant, produced by cloning the Initial variant.
537 : ///
538 : /// The sdk currently always clones once, even without retry policy.
539 : Actual {
540 : #[pin]
541 : inner: tokio_util::compat::Compat<tokio_util::io::StreamReader<S, Bytes>>,
542 : len: usize,
543 : read_any: bool,
544 : },
545 : /// Most likely unneeded, but left to make life easier, in case more clones are added.
546 : Cloned {
547 : len_was: usize,
548 : }
549 : }
550 : }
551 :
552 : impl<S> NonSeekableStream<S>
553 : where
554 : S: Stream<Item = std::io::Result<Bytes>> + Send + Sync + 'static,
555 : {
556 0 : fn new(inner: S, len: usize) -> NonSeekableStream<S> {
557 0 : use tokio_util::compat::TokioAsyncReadCompatExt;
558 0 :
559 0 : let inner = tokio_util::io::StreamReader::new(inner).compat();
560 0 : let inner = Some(inner);
561 0 : let inner = std::sync::Mutex::new(inner);
562 0 : NonSeekableStream::Initial { inner, len }
563 0 : }
564 : }
565 :
566 : impl<S> std::fmt::Debug for NonSeekableStream<S> {
567 0 : fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
568 0 : match self {
569 0 : Self::Initial { len, .. } => f.debug_struct("Initial").field("len", len).finish(),
570 0 : Self::Actual { len, .. } => f.debug_struct("Actual").field("len", len).finish(),
571 0 : Self::Cloned { len_was, .. } => f.debug_struct("Cloned").field("len", len_was).finish(),
572 : }
573 0 : }
574 : }
575 :
576 : impl<S> futures::io::AsyncRead for NonSeekableStream<S>
577 : where
578 : S: Stream<Item = std::io::Result<Bytes>>,
579 : {
580 0 : fn poll_read(
581 0 : self: std::pin::Pin<&mut Self>,
582 0 : cx: &mut std::task::Context<'_>,
583 0 : buf: &mut [u8],
584 0 : ) -> std::task::Poll<std::io::Result<usize>> {
585 0 : match self.project() {
586 : NonSeekableStreamProj::Actual {
587 0 : inner, read_any, ..
588 0 : } => {
589 0 : *read_any = true;
590 0 : inner.poll_read(cx, buf)
591 : }
592 : // NonSeekableStream::Initial does not support reading because it is just much easier
593 : // to have the mutex in place where one does not poll the contents, or that's how it
594 : // seemed originally. If there is a version upgrade which changes the cloning, then
595 : // that support needs to be hacked in.
596 : //
597 : // including {self:?} into the message would be useful, but unsure how to unproject.
598 0 : _ => std::task::Poll::Ready(Err(std::io::Error::new(
599 0 : std::io::ErrorKind::Other,
600 0 : "cloned or initial values cannot be read",
601 0 : ))),
602 : }
603 0 : }
604 : }
605 :
606 : impl<S> Clone for NonSeekableStream<S> {
607 : /// Weird clone implementation exists to support the sdk doing cloning before issuing the first
608 : /// request, see type documentation.
609 0 : fn clone(&self) -> Self {
610 0 : use NonSeekableStream::*;
611 0 :
612 0 : match self {
613 0 : Initial { inner, len } => {
614 0 : if let Some(inner) = inner.lock().unwrap().take() {
615 0 : Actual {
616 0 : inner,
617 0 : len: *len,
618 0 : read_any: false,
619 0 : }
620 : } else {
621 0 : Self::Cloned { len_was: *len }
622 : }
623 : }
624 0 : Actual { len, .. } => Cloned { len_was: *len },
625 0 : Cloned { len_was } => Cloned { len_was: *len_was },
626 : }
627 0 : }
628 : }
629 :
630 : #[async_trait::async_trait]
631 : impl<S> azure_core::SeekableStream for NonSeekableStream<S>
632 : where
633 : S: Stream<Item = std::io::Result<Bytes>> + Unpin + Send + Sync + 'static,
634 : {
635 0 : async fn reset(&mut self) -> azure_core::error::Result<()> {
636 : use NonSeekableStream::*;
637 :
638 0 : let msg = match self {
639 0 : Initial { inner, .. } => {
640 0 : if inner.get_mut().unwrap().is_some() {
641 0 : return Ok(());
642 : } else {
643 0 : "reset after first clone is not supported"
644 : }
645 : }
646 0 : Actual { read_any, .. } if !*read_any => return Ok(()),
647 0 : Actual { .. } => "reset after reading is not supported",
648 0 : Cloned { .. } => "reset after second clone is not supported",
649 : };
650 0 : Err(azure_core::error::Error::new(
651 0 : azure_core::error::ErrorKind::Io,
652 0 : std::io::Error::new(std::io::ErrorKind::Other, msg),
653 0 : ))
654 0 : }
655 :
656 : // Note: it is not documented if this should be the total or remaining length, total passes the
657 : // tests.
658 0 : fn len(&self) -> usize {
659 0 : use NonSeekableStream::*;
660 0 : match self {
661 0 : Initial { len, .. } => *len,
662 0 : Actual { len, .. } => *len,
663 0 : Cloned { len_was, .. } => *len_was,
664 : }
665 0 : }
666 : }
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