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Async::Redis

An asynchronous client for Redis including TLS. Support for streaming requests and responses. Built on top of async and async-io.

Development Status

Installation

$ bundle add async-redis

Usage

Basic Local Connection

require 'async/redis'

endpoint = Async::Redis.local_endpoint
client = Async::Redis::Client.new(endpoint)

Async do
	pp client.info
ensure
	client.close
end

Connecting to Redis SSL Endpoint

This example demonstrates parsing an environment variable with a redis:// or SSL rediss:// scheme, and demonstrates how you can specify SSL parameters on the SSLContext object.

require 'async/redis'

def make_redis_endpoint(uri)
	tcp_endpoint = Async::IO::Endpoint.tcp(uri.hostname, uri.port)
	case uri.scheme
	when 'redis'
		tcp_endpoint
	when 'rediss'
		ssl_context = OpenSSL::SSL::SSLContext.new
		ssl_context.set_params(
			ca_file: "/path/to/ca.crt",
			cert: OpenSSL::X509::Certificate.new(File.read("client.crt")),
			key: OpenSSL::PKey::RSA.new(File.read("client.key")),
		)
		Async::IO::SSLEndpoint.new(tcp_endpoint, ssl_context: ssl_context)
	else
		raise ArgumentError
	end
end

endpoint = make_redis_endpoint(URI(ENV['REDIS_URL']))
client = Async::Redis::Client.new(endpoint)

# ...

Variables

require 'async'
require 'async/redis'

endpoint = Async::Redis.local_endpoint
client = Async::Redis::Client.new(endpoint)

Async do
	client.set('X', 10)
	pp client.get('X')
ensure
	client.close
end

Subscriptions

require 'async'
require 'async/redis'

endpoint = Async::Redis.local_endpoint
client = Async::Redis::Client.new(endpoint)

Async do |task|
	condition = Async::Condition.new
	
	publisher = task.async do
		condition.wait
		
		client.publish 'status.frontend', 'good'
	end
	
	subscriber = task.async do
		client.subscribe 'status.frontend' do |context|
			condition.signal # We are waiting for messages.
			
			type, name, message = context.listen
			
			pp type, name, message
		end
	end
ensure
	client.close
end

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

License

Released under the MIT license.

Copyright, 2018, by Samuel G. D. Williams.
Copyright, 2018, by Huba Z. Nagy.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.