{"action":"closed","issue":{"url":"https://api.github.com/repos/allegro/ralph/issues/1791","repository_url":"https://api.github.com/repos/allegro/ralph","labels_url":"https://api.github.com/repos/allegro/ralph/issues/1791/labels{/name}","comments_url":"https://api.github.com/repos/allegro/ralph/issues/1791/comments","events_url":"https://api.github.com/repos/allegro/ralph/issues/1791/events","html_url":"https://github.com/allegro/ralph/issues/1791","id":106737987,"number":1791,"title":"REP 2: Ralph modules architecture","user":{"login":"vi4m","id":552398,"avatar_url":"https://avatars1.githubusercontent.com/u/552398?v=4","gravatar_id":"","url":"https://api.github.com/users/vi4m","html_url":"https://github.com/vi4m","followers_url":"https://api.github.com/users/vi4m/followers","following_url":"https://api.github.com/users/vi4m/following{/other_user}","gists_url":"https://api.github.com/users/vi4m/gists{/gist_id}","starred_url":"https://api.github.com/users/vi4m/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vi4m/subscriptions","organizations_url":"https://api.github.com/users/vi4m/orgs","repos_url":"https://api.github.com/users/vi4m/repos","events_url":"https://api.github.com/users/vi4m/events{/privacy}","received_events_url":"https://api.github.com/users/vi4m/received_events","type":"User","site_admin":false},"labels":[{"id":210501985,"url":"https://api.github.com/repos/allegro/ralph/labels/ng","name":"ng","color":"d4c5f9","default":false},{"id":261089392,"url":"https://api.github.com/repos/allegro/ralph/labels/REP","name":"REP","color":"fbca04","default":false}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":2,"created_at":"2015-09-16T09:45:16Z","updated_at":"2017-09-29T07:44:14Z","closed_at":"2017-09-29T07:44:14Z","author_association":"OWNER","body":"# Introduction\n\nAccording to the [Zen of Ralph](https://github.com/allegro/ralph/wiki/The-Zen-of-Ralph) we should avoid introducing new requirements for the main ralph package. \n\nRecently we started work on generating PDF reports / transition outprints which doesn't cover ralph scope itself. \n\nTherefore i propose simple and flexible architecture for separating concerns, following industry standards microservices architecture to separater further ralph modules to separate processes.\n# Ralph extensions architecture\n\nEvery new ralph extension, such as inky connector should be separated from main ralph package.\n1. Separate repository with the ralph_ext_ prefix\n2. Separate process, accessible from any network address\n3. Architecture doesn't depend on concrete microservices transport, such as nameko, lymph, or raw redis invocations\n4. Shared configuration using etcd daemon\n# Example - inkpy\n1. We create github repository called ralph_ext_inkpy with custom dependencies. This package doesn't depend on ralph itself, we don't want circural dependencies.\n2. We introduce extensions index in the documentation which explains what this extensions does.\n3. To simplify adoption of microservices, let's start with something simple. I thereby propose using just raw redis - rq  sync queues which gives us separation of processes, boundaries of services, but on the other hand -  doesn't introduce any new complex dependency such as rabbitmq, or zookeeper to maintain, and should be sufficient for our needs. \n"}}
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