grenache-ruby-http

Grenache is a micro-framework for connecting microservices. Its simple and optimized for performance.

Internally, Grenache uses Distributed Hash Tables (DHT, known from Bittorrent) for Peer to Peer connections. You can find more details how Grenche internally works at the Main Project Homepage

• Setup
• Examples
• API

Setup

Install

gem install grenache-ruby-http

Other Requirements

Install Grenache Grape: https://github.com/bitfinexcom/grenache-grape:

npm i -g grenache-grape

// Start 2 Grapes
grape --dp 20001 --aph 30001 --bn '127.0.0.1:20002'
grape --dp 20002 --aph 40001 --bn '127.0.0.1:20001'

Examples

RPC Server / Client

This RPC Server example announces a service called rpc_test on the overlay network. When a request from a client is received, it replies with world. It receives the payload hello from the client.

The client sends hello and receives world from the server.

Internally the DHT is asked for the IP of the server and then the request is done as Peer-to-Peer request via websockets.

Grape:

grape --dp 20001 --aph 30001 --bn '127.0.0.1:20002'
grape --dp 20002 --aph 40001 --bn '127.0.0.1:20001'

Server:

require "grenache-ruby-http"

EM.run do
  Signal.trap("INT")  { EventMachine.stop }
  Signal.trap("TERM") { EventMachine.stop }

  c = Grenache::Http.new(grape_address: "http://127.0.0.1:40001/")
  port = 5001

  c.listen("test_service", port) do |req|
      "hello #{req.payload}"
  end
end

Client:

require "grenache-ruby-http"

c = Grenache::Http.new(grape_address: "http://127.0.0.1:40001/")

resp, err = c.request("test_service", "world")

puts "response: #{resp}"

Code Server Code Client

API

Class: Grenache::Http

Grenache::Http.new(options)

• options

  • :grape_address <String>
  • :timeout <Number>
  • :auto_announce_interval <Number>
  • :auto_announce <Boolean>
  • :service_timeout <Number>
  • :service_host <String>
  • :key <String> SSL: Path to key file
  • :cert_pem <String> SSL: Path to chain file
  • :ca <String> SSL: Path to ca file
  • :service_host <String> SSL: host name, used for worker
  • :reject_unauthorized SSL: Reject unauthorized certs
  • :verify_mode SSL: Verification method, default Grenache::SSL_VERIFY_PEER

client.request(name, payload, options)

• name <String> Name of the service to address
• payload Payload to send
• options
  • :timeout Timeout for the request

Sends a single request to a RPC server/worker. Example.

client.put(data, options)

• data
  • :v: <String> value to store
• options
  • :timeout Timeout for the request

Puts a value into the DHT.

client.get(hash)

• hash <String> Hash of the data to receive

Retrieves a stored value from the DHT via a hash <String>.

client.listen(key, port, options)

• name <String> Name of the service to announce
• port <Number> Port to listen
• options

Sets up a worker which connects to the DHT. Listens on the given port.

Example.