How to use S3 client with Localstack?

[0nkery]

Tried to setup using endpoint_url and Endpoint::immutable to no avail. S3 client still tries to access buckets via bucket.localhost uri. :)

E.g. when I try to create a bucket it calls http://localhost:4566 with PUT / and fails with such error:

    2: Error { code: "InternalError", message: "exception while calling s3 with the unknown operation: Unable to find operation for request to service s3: PUT /", s3_extended_request_id: "s9lzHYrFp76ZVxRcpX9+5cjAnEH2ROuNkd2BHfIa6UkFVdtjf5mKR3/eTPFvsiP/XV/VLi31234=", aws_request_id: "95cf02bd-9b40-426e-bf20-2f4e6c1c8f96" }', s3_client/src/tests.rs:30:45

[Velfi]

Are you able to post a minimal example that reproduces your issue? Also, logging your app and then posting the logs is really helpful when debugging issues like this.

Also, in case you haven't seen them already, we have localstack examples here.

[0nkery]

UPD: It's not required, I could just use builder.force_path_style(true) (thanks to rcoh).

Solved the issue with this custom endpoint resolver:

pub struct ForceBucketInPathResolver {
    base_resolver: Endpoint,
}

impl ResolveEndpoint<aws_sdk_s3::config::endpoint::Params> for ForceBucketInPathResolver {
    fn resolve_endpoint(&self, params: &aws_sdk_s3::config::endpoint::Params) -> aws_smithy_http::endpoint::Result {
        match params.bucket() {
            Some(bucket) => self.base_resolver.resolve_endpoint(params).map(|ep| {
                let url = ep.url().to_owned();
                ep.into_builder().url(format!("{url}{bucket}")).build()
            }),
            None => self.base_resolver.resolve_endpoint(params),
        }
    }
}

[rcoh]

FYI, you don't need a custom endpoint resolver. You can set force_path_style(true) in the client config.

[0nkery]

Thanks a lot! Will change my answer.

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.