Check if needed configuration entries are present on startup

1 files changed, 66 insertions, 1 deletions

diff --git a/config/initializers/custom_config.rb b/config/initializers/custom_config.rb
index 4f1d968..a20dc7b 100644
--- a/config/initializers/custom_config.rb
+++ b/config/initializers/custom_config.rb
@@ -1 +1,66 @@
-APP_CONFIG = YAML.load_file("#{RAILS_ROOT}/config/config.yml")[RAILS_ENV]
+begin
+  APP_CONFIG = YAML.load_file("#{RAILS_ROOT}/config/config.yml")[RAILS_ENV]
+rescue
+  APP_CONFIG = Hash.new
+end
+
+class ConfigChecker
+  def initialize(config = Hash.new, key_prefix = '')
+    @errors = []
+    self.config = config
+    self.key_prefix = key_prefix
+  end
+
+  def config=(new_conf)
+    @config = new_conf || Hash.new
+  end
+
+  def key_prefix=(new_prefix)
+    @key_prefix = new_prefix || String.new
+  end
+
+  def errors
+    @errors
+  end
+
+  def config_must_have(key, type = Object)
+    @errors.push "Not found required key '#{@key_prefix}#{key}' in configuration." and return unless @config.include?(key)
+    @errors.push "Key '#{@key_prefix}#{key}' found in configuration but has wrong type (expected #{type})." unless @config[key].is_a? type
+  end
+
+  def config_must_have_one_of(keys, type = Object)
+    keys_s  = keys.inject(nil) do |res, cur|
+      if res.nil?
+       "'#{@key_prefix}#{cur}'"
+      else
+       "#{res}, '#{@key_prefix}#{cur}'"
+      end
+    end
+
+    found         = keys.inject(false) { |res, cur| res |= @config.include?(cur) }
+    correct_type  = keys.inject(false) { |res, cur| res |= @config.include?(cur) && @config[cur].is_a?(type) }
+
+    @errors.push "You should provide at least one of those keys: #{keys_s} in configuration." and return unless found
+    @errors.push "All of those keys: #{keys_s} were not present or had wrong (expected #{type})." unless correct_type
+  end
+end
+
+checker         = ConfigChecker.new(APP_CONFIG)
+
+checker.config_must_have('developer_data',  Hash)
+
+checker.config      = APP_CONFIG['developer_data']
+checker.key_prefix  = 'developer_data/'
+
+checker.config_must_have('check')
+
+if APP_CONFIG['developer_data'].try['check']
+  checker.config_must_have('min_months_mentor_is_dev')
+  checker.config_must_have_one_of(['uri', 'data'])
+end
+
+unless checker.errors.empty?
+  puts "Error(s) while checking configuration:"
+  checker.errors.each{ |err| puts " * #{err}" }
+  exit
+end