config.yml
如果未找到环境变量,我如何回退使用已解析文件 () 中的凭据?为了测试,我使用这个例子:
extern crate rusoto_core;
extern crate rusoto_s3;
use rusoto_core::credential::ChainProvider;
use rusoto_core::request::HttpClient;
use rusoto_core::Region;
use rusoto_s3::{S3, S3Client};
use std::time::{Duration, Instant};
fn main() {
let mut chain = ChainProvider::new();
chain.set_timeout(Duration::from_millis(200));
let s3client = S3Client::new_with(
HttpClient::new().expect("failed to create request dispatcher"),
chain,
Region::UsEast1,
);
let start = Instant::now();
println!("Starting up at {:?}", start);
match s3client.list_buckets().sync() {
Err(e) => println!("Error listing buckets: {}", e),
Ok(buckets) => println!("Buckets found: {:?}", buckets),
};
println!("Took {:?}", Instant::now().duration_since(start));
}
它可以工作,但需要环境变量AWS_ACCESS_KEY_ID
和AWS_SECRET_ACCESS_KEY
. 我想扩展它,以便如果没有定义的环境变量,我可以使用在解析文件中找到的键:
// parse config file
let file = std::fs::File::open("config.yml").expect("Unable to open file");
let yml: Config = match serde_yaml::from_reader(file) {
Err(err) => {
println!("Error: {}", err);
return;
}
Ok(yml) => yml,
};
config.yml
例如可能是这样的:
---
endpoint: s3.provider
access_key: ACCESS_KEY_ID
secret_key: SECRET_ACCESS_KEY
我可以添加什么chain
以使用在 中找到的凭据config.yml
,可能类似于:
let config_provider = StaticProvider::new_minimal(yml.access_key, yml.secret_key);
如何优先考虑环境,如果找不到,则使用提供的凭据StaticProvider
?