This release adds the cluster_async module, which introduces async Redis Cluster support. The code therein is largely taken from @Marwes's redis-cluster-async crate, which itself appears to have started from a sync Redis Cluster mplementation started by @atuk721. In any case, thanks to @Marwes and @atuk721 for the great work, and we hope to keep development moving forward in redis-rs.

This release also adds support for Rustls, a long-sought feature. Thanks to @rharish101 and @LeoRowan for getting this in! Note that the tls and async-std-tls-comp features have been deprecated and replaced by tls-native-tls and async-std-native-tls-comp, respectively.

Though async Redis Cluster functionality for the time being has been kept as close to the originating crate as possible, previous users of redis-cluster-async should note the following changes:

• Retries, while still configurable, can no longer be set to None/infinite retries
• Routing and slot parsing logic has been removed and merged with existing redis-rs functionality
• The client has been removed and superceded by common ClusterClient
• Renamed Connection to ClusterConnection
• Added support for reading from replicas
• Added support for insecure TLS
• Added support for setting both username and password

Breaking Changes

• Fix long-standing bug related to AsyncIter's stream implementation in which polling the server for additional data yielded broken data in most cases. Type bounds for AsyncIter have changed slightly, making this a potentially breaking change. (#597 @roger)

Changes

• Update Rustls to v0.21.0 (#820 @rharish101)
• Implement support for Rustls (#725 @rharish101, @LeoRowan)
• Commands: Add additional generic args for key arguments (#795 @MaxOhn)
• Add mset / deprecate set_multiple (#766 @randomairborne)
• More efficient interfaces for MultiplexedConnection and ConnectionManager (#811 @nihohit)
• Refactor / remove flaky test (#810)
• cluster_async: rename Connection to ClusterConnection, Pipeline to ClusterConnInner (#808)
• Support parsing IPV6 cluster nodes (#796 @socs)
• Common client for sync/async cluster connections (#798)
  • cluster::ClusterConnection underlying connection type is now generic (with existing type as default)
  • Support read_from_replicas in cluster_async
  • Set retries in ClusterClientBuilder
  • Add mock tests for cluster
• cluster-async common slot parsing(#793)
• Support async-std in cluster_async module (#790)
• Async-Cluster use same routing as Sync-Cluster (#789)
• Add Async Cluster Support (#696)
• Fix broken json-module tests (#786)
• cluster: Tls Builder support / simplify cluster connection map (#718 @0xWOF, @utkarshgupta137)