Retries, new client connection managment

New this week:

• Retry support. Note: If you are using client from the main branch be sure to upgrade. A major bug in the retry code landed although it was never in a release (#238). These support:
  • Modeled retries
  • The Retry-After header
  • Error Code based retries
  • Http Status based retries
• Improved client connection management (#237). Previously, if you had an aws_hyper::Client it was generic in C, the underlying Http connection. This made storing a client in a struct a little cumbersome. We have introduced a Standard connection that can still be swapped internally for use in tests but avoids the need for client code to manage a generic parameter.
• New usage examples. The "Movies" DynamoDB example has been ported to Rust and is now included in the examples folder. This also includes an example of a hand-written waiter. (#205)
• Docs are now generated for union variants (previously missing)

Compatibility:

• A number of pseudo internal APIs have been renamed. Consult the diff if you encounter issues.

Diff to last week: v0.0.3-cargo...v0.4-alpha.cargo

For Git based cargo users, use tag: v0.4-alpha.cargo

Tracing, User agent & Bugfixes

Hello! Welcome to our first regular installment of Tuesday releases.

New in this release:

• Tracing integration: Thanks to @alistaim for his feedback during development. Tracing events are now emitted when operations are dispatched at the info level. At the DEBUG level, a separate span is created to track time spent parsing.

Feb 22 17:21:33.390  INFO send_operation
  { operation="GenerateRandom" 
    service="kms" 
    status="construction_failure" 
    Failed to load credentials from the credentials provider}: 
  smithy_http_tower::parse_response: close time.busy=36.0µs time.idle=158µs

• User Agent Support: Two headers are now set on every request User-Agent and x-amz-user-agent. These identify the requester as the AWS Rust SDK & enable metrics on how many people are using the new SDK.

• Bug fixes: Two issue were fixed:

  • Missing HOST setter caused signing to fail.
  • Endpoints were being resolved incorrectly

SDK for DynamoDB, KMS, Secrets Manager & Kinesis

Very excited for our first real release!

• Environment variable & static credentials and region support
• Support for DynamoDB, KMS, Secrets Manager & Kinesis
• Request dispatch with Tokio/Hyper/Tower