Redis can crash at boot

[sfcgeorge]

If there's something wrong with Redis this will crash the app at boot. In our case Error undefined method smembers for RedisClient, but I think the specific error is less important than generally robust error handling.

I see this as a "nice to have" gem, so I'd rather it fail to record usage than crash at boot. IMO the whole internal Redis code in the gem should be wrapped in a rescue.

undefined method `smembers' for #<RedisClient::Pooled:0x00007fbc14110350 @config=#<RedisClient::Config:0x00007fbc14110c88 @username=nil, @password="REDACTED", @db=0, @id=nil, @ssl=true, @ssl_params=nil, @connect_timeout=1.0, @read_timeout=1.0, @write_timeout=1.0, @driver=RedisClient::RubyConnection, @custom={}, @client_implementation=RedisClient, @protocol=3, @command_builder=RedisClient::CommandBuilder, @inherit_socket=false, @reconnect_attempts=false, @connection_prelude=[["HELLO", "3", "AUTH", "default", "REDACTED"]], @circuit_breaker=nil, @middlewares_stack=RedisClient::Middlewares, @host="eu1-harmless-mako-39326.upstash.io", @port=39326, @path=nil>, @id=nil, @connect_timeout=1.0, @read_timeout=1.0, @write_timeout=1.0, @command_builder=RedisClient::CommandBuilder, @pid=2, @pool_kwargs={:timeout=>0.5, :size=>5}, @pool=#<ConnectionPool:0x00007fbc143d2598 @size=5, @timeout=0.5, @auto_reload_after_fork=true, @available=#<ConnectionPool::TimedStack:0x00007fbc143d2548 @create_block=#<Proc:0x00007fbc1410fe50 /usr/local/bundle/gems/redis-client-0.14.1/lib/redis_client/pooled.rb:83>, @created=0, @que=[], @max=5, @mutex=#<Thread::Mutex:0x00007fbc1410fdd8>, @resource=#<Thread::ConditionVariable:0x00007fbc1410fd88>, @shutdown_block=nil>, @key=:"pool-72220", @key_count=:"pool-72220-count">, @mutex=#<Thread::Mutex:0x00007fbc1410fb08>> (NoMethodError)

        members = DeadCodeDetector.config.redis.smembers(key)
                                               ^^^^^^^^^