object_store 0.7.0

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use crate::client::header::header_meta;
use crate::path::Path;
use crate::{Error, GetOptions, GetResult, ObjectMeta};
use crate::{GetResultPayload, Result};
use async_trait::async_trait;
use futures::{StreamExt, TryStreamExt};
use reqwest::Response;

/// A client that can perform a get request
#[async_trait]
pub trait GetClient: Send + Sync + 'static {
    const STORE: &'static str;

    async fn get_request(
        &self,
        path: &Path,
        options: GetOptions,
        head: bool,
    ) -> Result<Response>;
}

/// Extension trait for [`GetClient`] that adds common retrieval functionality
#[async_trait]
pub trait GetClientExt {
    async fn get_opts(&self, location: &Path, options: GetOptions) -> Result<GetResult>;

    async fn head(&self, location: &Path) -> Result<ObjectMeta>;
}

#[async_trait]
impl<T: GetClient> GetClientExt for T {
    async fn get_opts(&self, location: &Path, options: GetOptions) -> Result<GetResult> {
        let range = options.range.clone();
        let response = self.get_request(location, options, false).await?;
        let meta =
            header_meta(location, response.headers()).map_err(|e| Error::Generic {
                store: T::STORE,
                source: Box::new(e),
            })?;

        let stream = response
            .bytes_stream()
            .map_err(|source| Error::Generic {
                store: T::STORE,
                source: Box::new(source),
            })
            .boxed();

        Ok(GetResult {
            range: range.unwrap_or(0..meta.size),
            payload: GetResultPayload::Stream(stream),
            meta,
        })
    }

    async fn head(&self, location: &Path) -> Result<ObjectMeta> {
        let options = GetOptions::default();
        let response = self.get_request(location, options, true).await?;
        header_meta(location, response.headers()).map_err(|e| Error::Generic {
            store: T::STORE,
            source: Box::new(e),
        })
    }
}