Class: Skylight::Core::Config

Inherits:
Object
  • Object
show all
Includes:
Util::Logging
Defined in:
lib/skylight/core/config.rb

Constant Summary collapse

MUTEX =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

Mutex.new

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Util::Logging

#config_for_logging, #debug, #error, #fmt, #info, #log, #log_context, #log_env_prefix, #raise_on_error?, #t, #trace, #trace?, #warn

Constructor Details

#initialize(*args) ⇒ Config

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Config.


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# File 'lib/skylight/core/config.rb', line 97

def initialize(*args)
  attrs = {}

  if args.last.is_a?(Hash)
    attrs = args.pop.dup
  end

  @values   = {}
  @priority = {}
  @regexp   = nil
  @alert_logger = nil
  @logger = nil

  p = attrs.delete(:priority)

  if (@environment = args[0])
    @regexp = /^#{Regexp.escape(@environment)}\.(.+)$/
  end

  attrs.each do |k, v|
    self[k] = v
  end

  if p
    p.each do |k, v|
      @priority[self.class.remap_key(k)] = v
    end
  end
end

Instance Attribute Details

#alert_loggerObject


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# File 'lib/skylight/core/config.rb', line 392

def alert_logger
  @alert_logger ||= MUTEX.synchronize do
    unless (l = @alert_logger)
      out = get(:alert_log_file)
      out = Util::AlertLogger.new(load_logger) if out == "-"

      l = create_logger(out)
      l.level = Logger::DEBUG
    end

    l
  end
end

#environmentObject (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/skylight/core/config.rb', line 94

def environment
  @environment
end

#loggerObject


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# File 'lib/skylight/core/config.rb', line 383

def logger
  @logger ||=
    MUTEX.synchronize do
      load_logger
    end
end

Class Method Details

.default_valuesObject

Default values for Skylight configuration keys


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# File 'lib/skylight/core/config.rb', line 50

def self.default_values
  {
    log_file:                 "-".freeze,
    log_level:                "INFO".freeze,
    alert_log_file:           "-".freeze,
    log_sql_parse_errors:     true,
    enable_segments:          true,
    enable_sidekiq:           false,
    sinatra_route_prefixes:   false,
    'heroku.dyno_info_path':  "/etc/heroku/dyno"
  }
end

.env_matcherObject


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# File 'lib/skylight/core/config.rb', line 20

def self.env_matcher; /^(?:SK|SKYLIGHT)_(.+)$/ end

.env_prefixObject


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# File 'lib/skylight/core/config.rb', line 21

def self.env_prefix; "SKYLIGHT_" end

.env_to_keyObject

Map environment variable keys with Skylight configuration keys


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# File 'lib/skylight/core/config.rb', line 25

def self.env_to_key
  {
    # == Logging ==
    "LOG_FILE"       => :log_file,
    "LOG_LEVEL"      => :log_level,
    "ALERT_LOG_FILE" => :alert_log_file,
    "LOG_SQL_PARSE_ERRORS" => :log_sql_parse_errors,

    # == Proxy ==
    "PROXY_URL" => :proxy_url,

    # == Instrumenter ==
    "ENABLE_SEGMENTS" => :enable_segments,
    "ENABLE_SIDEKIQ" => :enable_sidekiq,
    "SINATRA_ROUTE_PREFIXES" => :sinatra_route_prefixes,

    # == User config settings ==
    "USER_CONFIG_PATH" => :user_config_path,

    # == Heroku settings ==
    "HEROKU_DYNO_INFO_PATH" => :'heroku.dyno_info_path'
  }
end

.legacy_keysObject

Maps legacy config keys to new config keys


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# File 'lib/skylight/core/config.rb', line 83

def self.legacy_keys
  # No legacy keys for now
  {}
end

.load(opts = {}, env = ENV) ⇒ Object


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# File 'lib/skylight/core/config.rb', line 127

def self.load(opts = {}, env = ENV)
  attrs = {}
  path = opts.delete(:file)
  environment = opts.delete(:environment)

  if path
    error = nil
    begin
      attrs = YAML.safe_load(ERB.new(File.read(path)).result,
                             [], # permitted_classes
                             [], # permitted_symbols
                             true # aliases enabled
                            )
      error = "empty file" unless attrs
      error = "invalid format" if attrs && !attrs.is_a?(Hash)
    rescue Exception => e
      error = e.message
    end

    raise ConfigError, "could not load config file; msg=#{error}" if error
  end

  if env
    attrs[:priority] = remap_env(env)
  end

  config = new(environment, attrs)

  opts.each do |k, v|
    config[k] = v
  end

  config
end

.log_nameObject

rubocop:disable Style/SingleLineMethods, Layout/EmptyLineBetweenDefs


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# File 'lib/skylight/core/config.rb', line 17

def self.log_name; "Skylight" end

.native_env_keysObject


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# File 'lib/skylight/core/config.rb', line 74

def self.native_env_keys
  %i[
    version
    root
    proxy_url
  ]
end

.remap_env(env) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/skylight/core/config.rb', line 168

def self.remap_env(env)
  ret = {}

  return ret unless env

  # Only set if it exists, we don't want to set to a nil value
  if (proxy_url = Util::Proxy.detect_url(env))
    ret[:proxy_url] = proxy_url
  end

  env.each do |k, val|
    next unless k =~ env_matcher
    next unless (key = env_to_key[$1])

    ret[key] =
      case val
      when /^false$/i      then false
      when /^true$/i       then true
      when /^(nil|null)$/i then nil
      when /^\d+$/         then val.to_i
      when /^\d+\.\d+$/    then val.to_f
      else val
      end
  end

  ret
end

.remap_key(key) ⇒ Object


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# File 'lib/skylight/core/config.rb', line 162

def self.remap_key(key)
  key = key.to_sym
  legacy_keys[key] || key
end

.required_keysObject


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# File 'lib/skylight/core/config.rb', line 63

def self.required_keys
  # Nothing is required in this base class.
  {}
end

.server_validated_keysObject


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# File 'lib/skylight/core/config.rb', line 68

def self.server_validated_keys
  # Nothing is validated for now, but this is a list of symbols
  # for the key we want to validate.
  []
end

.service_nameObject


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# File 'lib/skylight/core/config.rb', line 18

def self.service_name; log_name end

.support_emailObject


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# File 'lib/skylight/core/config.rb', line 19

def self.support_email; "[email protected]" end

.validatorsObject


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# File 'lib/skylight/core/config.rb', line 88

def self.validators
  # None for now
  {}
end

Instance Method Details

#as_jsonObject


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# File 'lib/skylight/core/config.rb', line 319

def as_json(*)
  {
    config: {
      priority: @priority,
      values:   @values
    }
  }
end

#check_file_permissions(file, key) ⇒ Object


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# File 'lib/skylight/core/config.rb', line 217

def check_file_permissions(file, key)
  file_root = File.dirname(file)

  # Try to make the directory, don't blow up if we can't. Our writable? check will fail later.
  FileUtils.mkdir_p file_root rescue nil

  if File.exist?(file) && !FileTest.writable?(file)
    raise ConfigError, "File `#{file}` is not writable. Please set #{key} in your config to a writable path"
  end

  unless FileTest.writable?(file_root)
    raise ConfigError, "Directory `#{file_root}` is not writable. Please set #{key} in your config to a writable path"
  end
end

#check_logfile_permissions(log_file, key) ⇒ Object


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# File 'lib/skylight/core/config.rb', line 232

def check_logfile_permissions(log_file, key)
  return if log_file == "-" # STDOUT
  log_file = File.expand_path(log_file, root)
  check_file_permissions(log_file, key)
end

#duration_ms(key, default = nil) ⇒ Object


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# File 'lib/skylight/core/config.rb', line 297

def duration_ms(key, default = nil)
  if (v = self[key]) && v.to_s =~ /^\s*(\d+)(s|sec|ms|micros|nanos)?\s*$/
    v = $1.to_i
    case $2
    when "ms"
      v
    when "micros"
      v / 1_000
    when "nanos"
      v / 1_000_000
    else # "s", "sec", nil
      v * 1000
    end
  else
    default
  end
end

#enable_segments?Boolean

Returns:

  • (Boolean)

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# File 'lib/skylight/core/config.rb', line 408

def enable_segments?
  !!get(:enable_segments)
end

#enable_sidekiq?Boolean

Returns:

  • (Boolean)

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# File 'lib/skylight/core/config.rb', line 412

def enable_sidekiq?
  !!get(:enable_sidekiq)
end

#gcObject

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/skylight/core/config.rb', line 357

def gc
  @gc ||= GC.new(self, get("gc.profiler", VM::GC.new))
end

#get(key, default = nil) ⇒ Object Also known as: []


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# File 'lib/skylight/core/config.rb', line 243

def get(key, default = nil)
  key = self.class.remap_key(key)

  return @priority[key] if @priority.key?(key)
  return @values[key]   if @values.key?(key)
  return self.class.default_values[key] if self.class.default_values.key?(key)

  if default
    return default
  elsif block_given?
    return yield key
  end

  nil
end

#ignored_endpointsObject

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/skylight/core/config.rb', line 362

def ignored_endpoints
  @ignored_endpoints ||=
    begin
      ignored_endpoints = get(:ignored_endpoints)

      # If, for some odd reason you have a comma in your endpoint name, use the
      # YML config instead.
      if ignored_endpoints.is_a?(String)
        ignored_endpoints = ignored_endpoints.split(/\s*,\s*/)
      end

      val = Array(get(:ignored_endpoint))
      val.concat(Array(ignored_endpoints))
      val
    end
end

#key?(key) ⇒ Boolean

Returns:

  • (Boolean)

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# File 'lib/skylight/core/config.rb', line 238

def key?(key)
  key = self.class.remap_key(key)
  @priority.key?(key) || @values.key?(key)
end

#on_heroku?Boolean

Returns:

  • (Boolean)

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# File 'lib/skylight/core/config.rb', line 424

def on_heroku?
  File.exist?(get(:'heroku.dyno_info_path'))
end

#rootObject


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# File 'lib/skylight/core/config.rb', line 379

def root
  self[:root] || Dir.pwd
end

#send_or_get(val) ⇒ Object


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# File 'lib/skylight/core/config.rb', line 293

def send_or_get(val)
  respond_to?(val) ? send(val) : get(val)
end

#set(key, val, scope = nil) ⇒ Object Also known as: []=


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# File 'lib/skylight/core/config.rb', line 261

def set(key, val, scope = nil)
  if scope
    key = [scope, key].join(".")
  end

  if val.is_a?(Hash)
    val.each do |k, v|
      set(k, v, key)
    end
  else
    k = self.class.remap_key(key)

    if (validator = self.class.validators[k])
      blk, msg = validator

      unless blk.call(val, self)
        error_msg = "invalid value for #{k} (#{val})"
        error_msg << ", #{msg}" if msg
        raise ConfigError, error_msg
      end
    end

    if @regexp && k =~ @regexp
      @priority[$1.to_sym] = val
    end

    @values[k] = val
  end
end

#sinatra_route_prefixes?Boolean

Returns:

  • (Boolean)

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# File 'lib/skylight/core/config.rb', line 416

def sinatra_route_prefixes?
  !!get(:sinatra_route_prefixes)
end

#to_jsonObject


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# File 'lib/skylight/core/config.rb', line 315

def to_json(*)
  JSON.generate(as_json)
end

#to_native_envObject


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# File 'lib/skylight/core/config.rb', line 328

def to_native_env
  ret = []

  self.class.native_env_keys.each do |key|
    value = send_or_get(key)
    unless value.nil?
      env_key = self.class.env_to_key.key(key) || key.upcase
      ret << "#{self.class.env_prefix}#{env_key}" << cast_for_env(value)
    end
  end

  ret
end

#user_configObject


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# File 'lib/skylight/core/config.rb', line 420

def user_config
  @user_config ||= UserConfig.new(self)
end

#validate!Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/skylight/core/config.rb', line 197

def validate!
  self.class.required_keys.each do |k, v|
    unless get(k)
      raise ConfigError, "#{v} required"
    end
  end

  log_file = self[:log_file]
  alert_log_file = self[:alert_log_file]

  check_logfile_permissions(log_file, "log_file")
  check_logfile_permissions(alert_log_file, "alert_log_file")

  true
end

#validate_with_serverObject


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# File 'lib/skylight/core/config.rb', line 213

def validate_with_server
  true
end

#versionObject

Helpers =====

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# File 'lib/skylight/core/config.rb', line 352

def version
  VERSION
end

#write(_path) ⇒ Object


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# File 'lib/skylight/core/config.rb', line 342

def write(_path)
  raise "not implemented"
end