sccache 0.15.0

Sccache is a ccache-like tool. It is used as a compiler wrapper and avoids compilation when possible. Sccache has the capability to utilize caching in remote storage environments, including various cloud storage options, or alternatively, in local storage.
Documentation 
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// Licensed 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 opendal::Operator;
use opendal::layers::{HttpClientLayer, LoggingLayer};
use opendal::services::Oss;

use crate::errors::*;

use super::http_client::set_user_agent;

pub struct OSSCache;

// Implement the Object Storage Service for Alibaba cloud
impl OSSCache {
    pub fn build(
        bucket: &str,
        key_prefix: &str,
        endpoint: Option<&str>,
        no_credentials: bool,
    ) -> Result<Operator> {
        let mut builder = Oss::default().bucket(bucket).root(key_prefix);

        if let Some(endpoint) = endpoint {
            builder = builder.endpoint(endpoint);
        }

        if no_credentials {
            // Allow anonymous access to OSS so that OpenDAL will not
            // throw error when no credentials are provided.
            builder = builder.allow_anonymous();
        }

        let op = Operator::new(builder)?
            .layer(HttpClientLayer::new(set_user_agent()))
            .layer(LoggingLayer::default())
            .finish();
        Ok(op)
    }
}