File 如何将使用Rusoto从S3下载的文件保存到我的硬盘?
我正试图从Rusoto的bucket下载一个文件,我得到了文件内容:File 如何将使用Rusoto从S3下载的文件保存到我的硬盘?,file,amazon-s3,rust,file-transfer,rusoto,File,Amazon S3,Rust,File Transfer,Rusoto,我正试图从Rusoto的bucket下载一个文件,我得到了文件内容: fn get_object(client: &TestClient, bucket: &str, filename: &str) { let get_req = GetObjectRequest { bucket: bucket.to_owned(), key: filename.to_owned(), ..Default::default()
fn get_object(client: &TestClient, bucket: &str, filename: &str) {
let get_req = GetObjectRequest {
bucket: bucket.to_owned(),
key: filename.to_owned(),
..Default::default()
};
let result = client.get_object(&get_req).sync().expect("Couldn't GET object");
let stream = result.body.unwrap();
let body = stream.concat2().wait().unwrap();
assert!(body.len() > 0);
}
如何将此
GetObjectOutput(result)
对象保存到文件中 你就快到了。您的代码将把对象放入主体
,这是一个向量
要将body
的内容写入文件:
use std::io::Write;
use std::fs::File;
let mut file = File::create("/path/to/my-object").expect("create failed");
file.write_all(&body).expect("failed to write body");
Rusoto现在使用标准库期货,不再提供
sync
方法,因此前面的答案不再有效
读入记忆
虽然ByteStream
有一个诱人的方法,但我不建议使用它。如果你试图在异步上下文中使用它,你会陷入恐慌,因为它启动了一个嵌套的Tokio执行器。如果您在异步上下文之外使用它,除非您非常小心地使用异步运行时,而不是在其中
另见:
我没有看到任何
GetObjectOutput
@hellow结果变量类型是我在Debugger中显示的GetObjectOutput在这种情况下,我是否应该选择您的答案来说明从现在起它是正确的?@Websterix您应该接受对您帮助最大的答案,并向上投票任何提供价值的答案。有没有人举过一个例子,说明使用上述方法将并发流下载(1:1)到文件中?@BrianBruggeman请看一下这种方法的一般结构。@Shepmaster我认为你在这里展示的是好的;这是否意味着我可以使用多个get对象来代替url?
use futures::stream::TryStreamExt;
use rusoto_core::Region;
use rusoto_s3::{GetObjectRequest, S3Client, S3};
type Error = Box<dyn std::error::Error>;
type Result<T, E = Error> = std::result::Result<T, E>;
const BUCKET_NAME: &str = "my very own bucket name";
#[tokio::main]
async fn main() -> Result<()> {
let client = S3Client::new(Region::UsEast2);
let mut object = client
.get_object(GetObjectRequest {
bucket: BUCKET_NAME.into(),
..Default::default()
})
.await?;
let body = object.body.take().expect("The object has no body");
let body = body.map_ok(|b| b.to_vec()).try_concat().await?;
println!("body length: {}", body.len());
Ok(())
}
use rusoto_core::Region;
use rusoto_s3::{GetObjectRequest, S3Client, S3};
use tokio::{fs::File, io};
type Error = Box<dyn std::error::Error>;
type Result<T, E = Error> = std::result::Result<T, E>;
const BUCKET_NAME: &str = "my very own bucket name";
#[tokio::main]
async fn main() -> Result<()> {
let client = S3Client::new(Region::UsEast2);
let mut object = client
.get_object(GetObjectRequest {
bucket: BUCKET_NAME.into(),
..Default::default()
})
.await?;
let body = object.body.take().expect("The object has no body");
let mut body = body.into_async_read();
let mut file = File::create("/tmp/a-place-to-write").await?;
io::copy(&mut body, &mut file).await?;
Ok(())
}
[dependencies]
rusoto_s3 = "0.43.0"
rusoto_core = "0.43.0"
tokio = { version = "0.2.21", features = ["macros"] }
futures = "0.3.5"