object_store_opendal/service/
reader.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use std::sync::Arc;
19
20use bytes::Bytes;
21use futures::stream::BoxStream;
22use futures::TryStreamExt;
23use object_store::path::Path as ObjectStorePath;
24use object_store::ObjectStore;
25
26use opendal::raw::*;
27use opendal::*;
28
29use super::core::parse_op_read;
30use super::error::parse_error;
31
32/// ObjectStore reader
33pub struct ObjectStoreReader {
34    bytes_stream: BoxStream<'static, object_store::Result<Bytes>>,
35    meta: object_store::ObjectMeta,
36    args: OpRead,
37}
38
39impl ObjectStoreReader {
40    pub(crate) async fn new(
41        store: Arc<dyn ObjectStore + 'static>,
42        path: &str,
43        args: OpRead,
44    ) -> Result<Self> {
45        let path = ObjectStorePath::from(path);
46        let opts = parse_op_read(&args)?;
47        let result = store.get_opts(&path, opts).await.map_err(parse_error)?;
48        let meta = result.meta.clone();
49        let bytes_stream = result.into_stream();
50        Ok(Self {
51            bytes_stream,
52            meta,
53            args,
54        })
55    }
56
57    pub(crate) fn rp(&self) -> RpRead {
58        let mut rp = RpRead::new().with_size(Some(self.meta.size));
59        if !self.args.range().is_full() {
60            let range = self.args.range();
61            let size = match range.size() {
62                Some(size) => size,
63                None => self.meta.size,
64            };
65            rp = rp.with_range(Some(
66                BytesContentRange::default().with_range(range.offset(), range.offset() + size - 1),
67            ));
68        }
69        rp
70    }
71}
72
73// ObjectStoreReader is safe to share between threads, because the `read()` method requires
74// `&mut self` and `rp()` is stateless.
75unsafe impl Sync for ObjectStoreReader {}
76
77impl oio::Read for ObjectStoreReader {
78    async fn read(&mut self) -> Result<Buffer> {
79        let bs = self.bytes_stream.try_next().await.map_err(parse_error)?;
80        Ok(bs.map(Buffer::from).unwrap_or_default())
81    }
82}
object_store_opendal/service/reader.rs

object_store_opendal/service/
reader.rs
