FindBucketRegion locates the AWS region in which bucket is located.

NewDefaultProvider returns a SessionProvider that calls session.NewSession(configs...) once.

NewImplementation creates a new file.Implementation for S3.

ParseURL parses a path of form "s3://grail-bucket/dir/file" and returns ("s3", "grail-bucket", "dir/file", nil).

ReadChunkBytes is the size for individual S3 API read operations, guided by S3 docs: As a general rule, when you download large objects within a Region from Amazon S3 to Amazon EC2, we suggest making concurrent requests for byte ranges of an object at the granularity of 8–16 MB.

BackoffPolicy defines backoff timing parameters.

MaxRetryDuration defines the max amount of time a request can spend retrying on errors.

UploadPartSize is the size of a chunk during multi-part uploads.

WithDeadline allows faking context.WithDeadline.

Options defines options that can be given when creating an s3Impl.