Super simple in memory key-value storage with expires for Crystal.
Add this to your application's shard.yml:
dependencies:
memory_cache:
github: kostya/memory_cacherequire "memory_cache"
cache = MemoryCache(String, Int32).new
cache.write("bla", 1)
p cache.read("bla") # => 1
cache.fetch("haha") { 2 }
p cache.read("haha") # => 2
cache.write("expired1", 1, expires_in: 1.second)
p cache.read("expired1") # => 1
sleep 1
p cache.read("expired1") # => nil
p cache.fetch("expired1", expires_in: 1.second) { 2 } # => 2
p cache.fetch("expired1", expires_in: 1.second) { 3 } # => 2
sleep 1
p cache.fetch("expired1", expires_in: 1.second) { 3 } # => 3