S3 service root and region not effective

[zooeywm]

1. Operator create:

fn create_s3_operator(
    storage_server_id: Uuid,
    options: &ObjectServerOption,
) -> anyhow::Result<Operator> {
    let endpoint = &options.endpoint;
    let access_key_id = &options.access_key_id;
    let secret_access_key = &options.secret_access_key;
    let region = &options.region;
    let bucket = &options.default_bucket;
    let mut builder = S3::default();
    builder
        .endpoint(endpoint)
        .root(&format!("storage-{}", storage_server_id))
        .bucket(bucket)
        .region(region)
        .access_key_id(access_key_id)
        .secret_access_key(secret_access_key)
        .allow_anonymous()
        .build()?;
    Ok(Operator::new(builder)?.finish())
}

2. Use operator:

 async fn upload(
        &self,
        storage_server: &StorageServer,
        meta_id: Uuid,
        content: &[u8],
    ) -> ... {
    ...
    let operator = create_s3_operator(storage_server.id, options)?;
    operator.write(&meta_id.to_string(), content.to_owned()).await?;
    ...
}

in my expectation, this operator will create a file named {meta_id} in the path storage-{storage_server_id}, but the result is that it creates the file named {meta_id}` in the root directory.

And I find that the build info has logged twice:

2023-09-04T08:02:06.663003Z DEBUG ThreadId(19) opendal::services::s3::backend: xx\opendal-0.39.0\src\services\s3\backend.rs:692: backend build started: Builder { root: Some("storage-4f600062-0105-40a4-aa7d-6f373cc51358"), bucket: "xx", endpoint: Some("xx"), region: Some("xx"), .. }
2023-09-04T08:02:06.663295Z DEBUG ThreadId(19) opendal::services::s3::backend: xx\opendal-0.39.0\src\services\s3\backend.rs:695: backend use root /storage-4f600062-0105-40a4-aa7d-6f373cc51358/
...
2023-09-04T08:02:06.669007Z DEBUG ThreadId(19) opendal::services::s3::backend: xx\opendal-0.39.0\src\services\s3\backend.rs:692: backend build started: Builder { root: None, bucket: "xx", endpoint: Some("xx"), region: None, .. }
2023-09-04T08:02:06.669186Z DEBUG ThreadId(19) opendal::services::s3::backend: xx\opendal-0.39.0\src\services\s3\backend.rs:695: backend use root /

[Xuanwo]

Please don't call builder.build? directly, it will take and consume builder itself. Instead:

let mut builder = S3::default();
builder
    .endpoint(endpoint)
    .root(&format!("storage-{}", storage_server_id))
    .bucket(bucket)
    .region(region)
    .access_key_id(access_key_id)
    .secret_access_key(secret_access_key)
    .allow_anonymous();
Ok(Operator::new(builder)?.finish())

[zooeywm]

Thanks for your answer! It solved my problem. I have misunderstood the meaning of builder.