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clj-web-from-the-ground-up-5.md

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add config

[aero "1.1.6"]

resources\config.edn

{:db-spec {:dbtype "h2" :dbname "example"}}

config.clj

(ns clj-web.config
  (:require [com.stuartsierra.component :as component]
            [aero.core :refer (read-config)]))

(defrecord Config [config-file config]
  component/Lifecycle
  (start [this]
    (assoc this :config (read-config (clojure.java.io/resource config-file))))
  (stop [this]
    (assoc this :config nil)))

(defn new-config []
  (map->Config {:config-file "config.edn"}))

db.clj

(defrecord Database [datasource config]
  Lifecycle
  (start [this]
    (let [db-spec (get-in config [:config :db-spec])]
      (assoc this :datasource (connection/->pool HikariDataSource db-spec))))
  (stop [this]
    (.close datasource)
    (assoc this :datasource nil)))

(defn new-database []
  (map->Database {}))

system

(defn app-system
  []
  (-> (component/system-map
       :config (new-config)
       :db (new-database)
       :app (new-app)
       :http (jetty-server {:port 3000}))
      (component/system-using
       {:http [:app]
        :app [:db]
        :db [:config]})))