Add SSL/TLS support

[thomas-netcraft]

Summary

Add SSL support the Redis::Fast client.

hireds already supports SSL so it is just a matter of pulling that support through to the Perl bindings. In order to facilitate unit testing, we also add support for various SSL verification modes. Interface consistency with Perl's standard Redis client is maintained.

Resolves https://github.com/shogo82148/Redis-Fast/issues/143

Unit testing

Changes to unit tests were heavily inspired by https://github.com/PerlRedis/perl-redis/pull/129

Connecting to a local Redis server over an encrypted connection is done by instantiating stunnel with dummy certificates.

Setting the environment variable USE_SSL to a truthy value causes all unit tests which support SSL to be carried out with an encrypted connection.

Benchmarking

To get a rough idea of the performance impact, the benchmarking script was run against an AWS ElastiCache instance, using both the Redis and Redis::Fast clients with & without SSL enabled.

Intentionally unsupported features

• SSL for Redis Sentinel
• Authenticating with client certificates

Summary by CodeRabbit

• New Features
  • Introduced SSL/TLS support for enhanced security in Redis connections.
  • Added SSL configuration options and verification modes for flexible SSL setups.
  • Implemented SSL availability checks throughout the system to ensure compatibility and security.
• Bug Fixes
  • Disabled SSL support for sentinels to maintain stability and compatibility.
• Tests
  • Expanded test coverage to include SSL/TLS scenarios, ensuring robustness and security.
  • Adjusted existing tests to incorporate SSL parameters and cleanup routines for thorough testing.
• Chores
  • Enhanced diagnostic messages for better clarity during debugging and operational monitoring.
• Documentation
  • Updated internal documentation to reflect changes related to SSL support and configuration.

[coderabbitai[bot]]

Walkthrough

This update introduces TLS support to a Redis client library, enhancing security by enabling encrypted connections. It includes adding SSL configuration options, ensuring SSL connections are handled correctly, and disabling SSL for sentinel connections due to compatibility concerns. The changes span across initialization, connection handling, and testing, demonstrating a comprehensive effort to integrate SSL support while maintaining functionality.

Changes

Files	Changes
builder/MyBuilder.pm, src/Redis__Fast.xs, lib/Redis/Fast.pm, lib/Redis/Fast/Sentinel.pm	Added SSL support, including configuration options and connection handling. Disabled SSL for sentinels.
t/*.t	Enhanced tests to support SSL, including initialization with SSL parameters, and added cleanup logic.
t/tlib/Test/SpawnRedisServer.pm	Implemented SSL/TLS mode handling and stunnel setup for Redis server in testing environment.

Assessment against linked issues

Objective	Addressed	Explanation
Add support for TLS (#143)	✅

Poem

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