Initial mess

.env

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+DATABASE_URL="redis://someremote-redis-saas:6379/15"

.env.development

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+DATABASE_URL="redis://localhost:6379/1"

.gitignore

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+.rubocop-*

.rubocop.yml

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+inherit_from: https://raw.githubusercontent.com/jodosha/dotfiles/master/rubocop.yml

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "hanami-api", git: "https://github.com/hanami/api.git", branch: "feature/container"
+gem "dry-system", "~> 0.19"
+
+gem "puma"
+gem "redis"
+
+gem "byebug", require: false
+gem "rubocop"

Gemfile.lock

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+GIT
+  remote: https://github.com/hanami/api.git
+  revision: 2c30a9ca301f2239b2e1d0150c31967dd2f6ca80
+  branch: feature/container
+  specs:
+    hanami-api (0.2.0)
+      hanami-router (~> 2.0.alpha)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    byebug (11.1.3)
+    concurrent-ruby (1.1.8)
+    dry-auto_inject (0.7.0)
+      dry-container (>= 0.3.4)
+    dry-configurable (0.12.1)
+      concurrent-ruby (~> 1.0)
+      dry-core (~> 0.5, >= 0.5.0)
+    dry-container (0.7.2)
+      concurrent-ruby (~> 1.0)
+      dry-configurable (~> 0.1, >= 0.1.3)
+    dry-core (0.5.0)
+      concurrent-ruby (~> 1.0)
+    dry-inflector (0.2.0)
+    dry-logic (1.2.0)
+      concurrent-ruby (~> 1.0)
+      dry-core (~> 0.5, >= 0.5)
+    dry-struct (1.4.0)
+      dry-core (~> 0.5, >= 0.5)
+      dry-types (~> 1.5)
+      ice_nine (~> 0.11)
+    dry-system (0.19.0)
+      concurrent-ruby (~> 1.0)
+      dry-auto_inject (>= 0.4.0)
+      dry-configurable (~> 0.12, >= 0.12.1)
+      dry-container (~> 0.7, >= 0.7.2)
+      dry-core (~> 0.5, >= 0.5)
+      dry-inflector (~> 0.1, >= 0.1.2)
+      dry-struct (~> 1.0)
+    dry-types (1.5.1)
+      concurrent-ruby (~> 1.0)
+      dry-container (~> 0.3)
+      dry-core (~> 0.5, >= 0.5)
+      dry-inflector (~> 0.1, >= 0.1.2)
+      dry-logic (~> 1.0, >= 1.0.2)
+    hanami-router (2.0.0.alpha5)
+      mustermann (~> 1.0)
+      mustermann-contrib (~> 1.0)
+      rack (~> 2.0)
+    hansi (0.2.0)
+    ice_nine (0.11.2)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    mustermann-contrib (1.1.1)
+      hansi (~> 0.2.0)
+      mustermann (= 1.1.1)
+    nio4r (2.5.7)
+    parallel (1.20.1)
+    parser (3.0.1.1)
+      ast (~> 2.4.1)
+    puma (5.3.1)
+      nio4r (~> 2.0)
+    rack (2.2.3)
+    rainbow (3.0.0)
+    redis (4.2.5)
+    regexp_parser (2.1.1)
+    rexml (3.2.5)
+    rubocop (1.14.0)
+      parallel (~> 1.10)
+      parser (>= 3.0.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.5.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.5.0)
+      parser (>= 3.0.1.1)
+    ruby-progressbar (1.11.0)
+    ruby2_keywords (0.0.4)
+    unicode-display_width (2.0.0)
+
+PLATFORMS
+  x86_64-darwin-19
+
+DEPENDENCIES
+  byebug
+  dry-system (~> 0.19)
+  hanami-api!
+  puma
+  redis
+  rubocop
+
+BUNDLED WITH
+   2.2.16

README.md

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+# MyApi
+
+Example `hanami-api` app with `dry-system`
+
+## Prerequisites
+
+  * Ruby 3+
+  * Redis
+
+## How to run
+
+  1. Clone this repository
+  2. Run `bundle install`
+  3. Start Redis
+  4. Start the server via `bundle exec rackup`

app.rb

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+# frozen_string_literal: true
+
+require "hanami/api"
+require "hanami/api/container"
+
+class Foo
+  def call(arg)
+    arg.to_s.upcase
+  end
+end
+
+class MyApi < Hanami::API
+  extend Hanami::API::Container
+
+  configure do |config|
+    config.root Pathname.new(Dir.pwd)
+  end
+
+  settings do
+    key :database_url, Types::String.constrained(filled: true)
+  end
+
+  register "foo" do
+    Foo.new
+  end
+
+  root do
+    foo.call("hello")
+  end
+
+  get "/keys" do
+    database.keys.join(", ")
+  end
+end

config.ru

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+# frozen_string_literal: true
+
+require_relative "./app"
+
+run MyApi.new

system/boot/database.rb

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+# frozen_string_literal: true
+
+MyApi.container.boot(:database) do |container|
+  init do
+    require "uri"
+    require "redis"
+
+    uri = URI.parse(container[:settings].database_url)
+    redis = Redis.new(uri: uri.to_s)
+
+    register(:database, redis)
+  end
+
+  stop do
+    database.stop
+  end
+end