dyndnsd: handle potential nil cases detected by sorbet

- including review suggestions from @jgraichen

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 *.lock
 pkg/*
+sorbet/rbi/hidden-definitions/errors.txt

.rubocop.yml

@@ -1,15 +1,25 @@
-inherit_from: .rubocop_todo.yml
-
 AllCops:
   TargetRubyVersion: '2.3'
 
 Gemspec/OrderedDependencies:
   Enabled: false
 
+Layout/EmptyLineAfterGuardClause:
+  Enabled: false
+
 # allows nicer usage of private_class_method
 Layout/EmptyLinesAroundArguments:
   Enabled: false
 
+Layout/HashAlignment:
+  Enabled: false
+
+Layout/LeadingEmptyLines:
+  Enabled: false
+
+Layout/LineLength:
+  Max: 200
+
 Layout/SpaceInsideHashLiteralBraces:
   Enabled: false
 
@@ -25,16 +35,13 @@ Metrics/ClassLength:
 Metrics/CyclomaticComplexity:
   Enabled: false
 
-Metrics/LineLength:
-  Max: 200
-
 Metrics/MethodLength:
   Enabled: false
 
 Metrics/PerceivedComplexity:
   Enabled: false
 
-Naming/UncommunicativeMethodParamName:
+Naming/MethodParameterName:
   Enabled: false
 
 Naming/MemoizedInstanceVariableName:
@@ -55,6 +62,15 @@ Style/FrozenStringLiteralComment:
 Style/GuardClause:
   Enabled: false
 
+Style/HashEachMethods:
+  Enabled: true
+
+Style/HashTransformKeys:
+  Enabled: true
+
+Style/HashTransformValues:
+  Enabled: true
+
 Style/IdenticalConditionalBranches:
   Enabled: false
 

.rubocop_todo.yml

@@ -1,7 +0,0 @@
-# This configuration was generated by
-# `rubocop --auto-gen-config`
-# on 2018-02-23 12:54:10 +0100 using RuboCop version 0.52.1.
-# The point is for the user to remove these configuration records
-# one by one as the offenses are removed from the code base.
-# Note that changes in the inspected code, or installation of new
-# versions of RuboCop, may require this file to be generated again.

.travis.yml

@@ -1,7 +1,9 @@
 ---
-sudo: false
+os: linux
 language: ruby
 rvm:
-  - 2.5
-  - 2.4
-  - 2.3
+- 2.7
+- 2.6
+- 2.5
+- 2.4
+- 2.3

CHANGELOG.md

@@ -1,6 +1,13 @@
 # Changelog
 
-## 2.0.0
+## 2.1.0
+
+IMPROVEMENTS:
+
+- Add Ruby 2.7 support
+- Add experimental [Sorbet](https://sorbet.org) support to development tools, fix surfaced problems
+
+## 2.0.0 (January 25, 2019)
 
 IMPROVEMENTS:
 
@@ -8,7 +15,7 @@ IMPROVEMENTS:
 - Better protocol compliance by returning `badauth` in response body on HTTP 401 errors
 - Better code maintainability by refactorings
 - Update dependencies, mainly `rack` to new major version 2
-- Add Ruby 2.5 support
+- Add Ruby 2.5 and Ruby 2.6 support
 - Add experimental [OpenTracing](http://opentracing.io/) support with [CNCF Jaeger](https://github.com/jaegertracing/jaeger)
 - Support host offlining by deleting the associated DNS records
 - Add textfile reporter to write Graphite-style metrics (also compatible with [Prometheus](https://prometheus.io/)) into a file

Rakefile

@@ -1,8 +1,14 @@
 require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 require 'rubocop/rake_task'
+require 'bundler/audit/task'
 
 RSpec::Core::RakeTask.new(:spec)
 RuboCop::RakeTask.new
+Bundler::Audit::Task.new
 
-task default: [:rubocop, :spec]
+task :sorbet do
+  sh 'srb typecheck'
+end
+
+task default: [:rubocop, :sorbet, :spec, 'bundle:audit']

dyndnsd.gemspec

@@ -23,14 +23,16 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'rack', '~> 2.0'
   s.add_runtime_dependency 'json'
   s.add_runtime_dependency 'metriks'
-  s.add_runtime_dependency 'opentracing', '~> 0.4.0'
-  s.add_runtime_dependency 'rack-tracer', '~> 0.5.0'
-  s.add_runtime_dependency 'spanmanager', '~> 0.3.0'
-  s.add_runtime_dependency 'jaeger-client', '~> 0.4.0'
+  s.add_runtime_dependency 'opentracing', '~> 0.5.0'
+  s.add_runtime_dependency 'rack-tracer', '~> 0.9.0'
+  s.add_runtime_dependency 'jaeger-client', '~> 0.10.0'
+  s.add_runtime_dependency 'sorbet-runtime', '~> 0.5.0'
 
   s.add_development_dependency 'bundler'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'rack-test'
-  s.add_development_dependency 'rubocop', '~> 0.55.0'
+  s.add_development_dependency 'rubocop', '~> 0.80.0'
+  s.add_development_dependency 'bundler-audit', '~> 0.6.0'
+  s.add_development_dependency 'sorbet', '~> 0.5.0'
 end

lib/dyndnsd.rb

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# typed: true
 
 require 'etc'
 require 'logger'
@@ -10,7 +11,6 @@ require 'metriks'
 require 'metriks/reporter/graphite'
 require 'opentracing'
 require 'rack/tracer'
-require 'spanmanager'
 
 require 'dyndnsd/generator/bind'
 require 'dyndnsd/updater/command_with_bind_zone'
@@ -96,8 +96,14 @@ module Dyndnsd
 
       # drop priviliges as soon as possible
       # NOTE: first change group than user
-      Process::Sys.setgid(Etc.getgrnam(config['group']).gid) if config['group']
-      Process::Sys.setuid(Etc.getpwnam(config['user']).uid) if config['user']
+      if config['group']
+        group = Etc.getgrnam(config['group'])
+        Process::Sys.setgid(group.gid) if group
+      end
+      if config['user']
+        user = Etc.getpwnam(config['user'])
+        Process::Sys.setuid(user.uid) if user
+      end
 
       setup_traps
 
@@ -266,8 +272,6 @@ module Dyndnsd
           host: host, port: port, service_name: service_name, flush_interval: 1
         )
       end
-      # always use SpanManager
-      OpenTracing.global_tracer = SpanManager::Tracer.new(OpenTracing.global_tracer)
     end
 
     private_class_method def self.setup_rack(config)

lib/dyndnsd/database.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 require 'forwardable'
 
@@ -13,7 +14,7 @@ module Dyndnsd
 
     def load
       if File.file?(@db_file)
-        @db = JSON.parse(File.open(@db_file, 'r', &:read))
+        @db = JSON.parse(File.read(@db_file, mode: 'r'))
       else
         @db = {}
       end

lib/dyndnsd/generator/bind.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 module Dyndnsd
   module Generator

lib/dyndnsd/helper.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 require 'ipaddr'
 
@@ -28,13 +29,24 @@ module Dyndnsd
     end
 
     def self.span(operation, &block)
-      span = OpenTracing.start_span(operation)
+      scope = OpenTracing.start_active_span(operation)
+      span = scope.span
       span.set_tag('component', 'dyndnsd')
       span.set_tag('span.kind', 'server')
       begin
         block.call(span)
+      rescue StandardError => e
+        span.set_tag('error', true)
+        span.log_kv(
+          event: 'error',
+          'error.kind': e.class.to_s,
+          'error.object': e,
+          message: e.message,
+          stack: e.backtrace&.join("\n") || ''
+        )
+        raise
       ensure
-        span.finish
+        scope.close
       end
     end
   end

lib/dyndnsd/responder/dyndns_style.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 module Dyndnsd
   module Responder

lib/dyndnsd/responder/rest_style.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 module Dyndnsd
   module Responder

lib/dyndnsd/textfile_reporter.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 # Adapted from https://github.com/eric/metriks-graphite/blob/master/lib/metriks/reporter/graphite.rb
 

lib/dyndnsd/updater/command_with_bind_zone.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 module Dyndnsd
   module Updater
@@ -8,19 +9,19 @@ module Dyndnsd
         @generator = Generator::Bind.new(domain, config)
       end
 
-      def update(zone)
+      def update(db)
         Helper.span('updater_update') do |span|
-          span.set_tag('dyndnsd.updater.name', self.class.name.split('::').last)
+          span.set_tag('dyndnsd.updater.name', self.class.name&.split('::')&.last || 'None')
 
           # write zone file in bind syntax
-          File.open(@zone_file, 'w') { |f| f.write(@generator.generate(zone)) }
+          File.open(@zone_file, 'w') { |f| f.write(@generator.generate(db)) }
           # call user-defined command
           pid = fork do
             exec @command
           end
 
           # detach so children don't become zombies
-          Process.detach(pid)
+          Process.detach(pid) if pid
         end
       end
     end

lib/dyndnsd/version.rb

@@ -1,4 +1,5 @@
+# typed: true
 
 module Dyndnsd
-  VERSION = '2.0.0.rc2'.freeze
+  VERSION = '2.0.0'.freeze
 end

sorbet/config

@@ -0,0 +1,2 @@
+--dir
+.

sorbet/rbi/jaeger-client.rbi

@@ -0,0 +1,5 @@
+# typed: strong
+
+module Jaeger::Client
+    def self.build(*args); end
+end

sorbet/rbi/rack.rbi

@@ -0,0 +1,5 @@
+# typed: strong
+
+class Rack::Auth::Basic
+    def initialize(app, *args); end
+end

sorbet/rbi/sorbet-typed/lib/rainbow/all/rainbow.rbi

@@ -0,0 +1,276 @@
+# This file is autogenerated. Do not edit it by hand. Regenerate it with:
+#   srb rbi sorbet-typed
+#
+# If you would like to make changes to this file, great! Please upstream any changes you make here:
+#
+#   https://github.com/sorbet/sorbet-typed/edit/master/lib/rainbow/all/rainbow.rbi
+#
+# typed: strong
+
+module Rainbow
+  sig { returns(T::Boolean) }
+  attr_accessor :enabled
+
+  class Color
+    sig { returns(Symbol) }
+    attr_reader :ground
+
+    sig do
+      params(
+        ground: Symbol,
+        values: T.any([Integer], [Integer, Integer, Integer])
+      ).returns(Color)
+    end
+    def self.build(ground, values); end
+
+    sig { params(hex: String).returns([Integer, Integer, Integer]) }
+    def self.parse_hex_color(hex); end
+
+    class Indexed < Color
+      sig { returns(Integer) }
+      attr_reader :num
+
+      sig { params(ground: Symbol, num: Integer).returns(Indexed) }
+      def initialize(ground, num); end
+
+      sig { returns(T::Array[Integer]) }
+      def codes; end
+    end
+
+    class Named < Indexed
+      NAMES = T.let(nil, T::Hash[Symbol, Integer])
+
+      sig { returns(T::Array[Symbol]) }
+      def self.color_names; end
+
+      sig { returns(String) }
+      def self.valid_names; end
+
+      sig { params(ground: Symbol, name: Symbol).returns(Named) }
+      def initialize(ground, name); end
+    end
+
+    class RGB < Indexed
+      sig { returns(Integer) }
+      attr_accessor :r, :g, :b
+
+      sig { params(value: Numeric).returns(Integer) }
+      def to_ansi_domain(value); end
+
+      sig { params(ground: Symbol, values: Integer).returns(RGB) }
+      def initialize(ground, *values); end
+
+      sig { returns(T::Array[Integer]) }
+      def codes; end
+    end
+
+    class X11Named < RGB
+      include X11ColorNames
+
+      sig { returns(T::Array[Symbol]) }
+      def self.color_names; end
+
+      sig { returns(String) }
+      def self.valid_names; end
+
+      sig { params(ground: Symbol, name: Symbol).returns(X11Named) }
+      def initialize(ground, name); end
+    end
+  end
+
+  sig { returns(Wrapper) }
+  def self.global; end
+
+  sig { returns(T::Boolean) }
+  def self.enabled; end
+
+  sig { params(value: T::Boolean).returns(T::Boolean) }
+  def self.enabled=(value); end
+
+  sig { params(string: String).returns(String) }
+  def self.uncolor(string); end
+
+  class NullPresenter < String
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(NullPresenter) }
+    def color(*values); end
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(NullPresenter) }
+    def foreground(*values); end
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(NullPresenter) }
+    def fg(*values); end
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(NullPresenter) }
+    def background(*values); end
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(NullPresenter) }
+    def bg(*values); end
+
+    sig { returns(NullPresenter) }
+    def reset; end
+
+    sig { returns(NullPresenter) }
+    def bright; end
+
+    sig { returns(NullPresenter) }
+    def faint; end
+
+    sig { returns(NullPresenter) }
+    def italic; end
+
+    sig { returns(NullPresenter) }
+    def underline; end
+
+    sig { returns(NullPresenter) }
+    def blink; end
+
+    sig { returns(NullPresenter) }
+    def inverse; end
+
+    sig { returns(NullPresenter) }
+    def hide; end
+
+    sig { returns(NullPresenter) }
+    def cross_out; end
+
+    sig { returns(NullPresenter) }
+    def black; end
+
+    sig { returns(NullPresenter) }
+    def red; end
+
+    sig { returns(NullPresenter) }
+    def green; end
+
+    sig { returns(NullPresenter) }
+    def yellow; end
+
+    sig { returns(NullPresenter) }
+    def blue; end
+
+    sig { returns(NullPresenter) }
+    def magenta; end
+
+    sig { returns(NullPresenter) }
+    def cyan; end
+
+    sig { returns(NullPresenter) }
+    def white; end
+
+    sig { returns(NullPresenter) }
+    def bold; end
+
+    sig { returns(NullPresenter) }
+    def dark; end
+
+    sig { returns(NullPresenter) }
+    def strike; end
+  end
+
+  class Presenter < String
+    TERM_EFFECTS = T.let(nil, T::Hash[Symbol, Integer])
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(Presenter) }
+    def color(*values); end
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(Presenter) }
+    def foreground(*values); end
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(Presenter) }
+    def fg(*values); end
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(Presenter) }
+    def background(*values); end
+
+    sig { params(values: T.any([Integer], [Integer, Integer, Integer])).returns(Presenter) }
+    def bg(*values); end
+
+    sig { returns(Presenter) }
+    def reset; end
+
+    sig { returns(Presenter) }
+    def bright; end
+
+    sig { returns(Presenter) }
+    def faint; end
+
+    sig { returns(Presenter) }
+    def italic; end
+
+    sig { returns(Presenter) }
+    def underline; end
+
+    sig { returns(Presenter) }
+    def blink; end
+
+    sig { returns(Presenter) }
+    def inverse; end
+
+    sig { returns(Presenter) }
+    def hide; end
+
+    sig { returns(Presenter) }
+    def cross_out; end
+
+    sig { returns(Presenter) }
+    def black; end
+
+    sig { returns(Presenter) }
+    def red; end
+
+    sig { returns(Presenter) }
+    def green; end
+
+    sig { returns(Presenter) }
+    def yellow; end
+
+    sig { returns(Presenter) }
+    def blue; end
+
+    sig { returns(Presenter) }
+    def magenta; end
+
+    sig { returns(Presenter) }
+    def cyan; end
+
+    sig { returns(Presenter) }
+    def white; end
+
+    sig { returns(Presenter) }
+    def bold; end
+
+    sig { returns(Presenter) }
+    def dark; end
+
+    sig { returns(Presenter) }
+    def strike; end
+  end
+
+  class StringUtils
+    sig { params(string: String, codes: T::Array[Integer]).returns(String) }
+    def self.wrap_with_sgr(string, codes); end
+
+    sig { params(string: String).returns(String) }
+    def uncolor(string); end
+  end
+
+  VERSION = T.let(nil, String)
+
+  class Wrapper
+    sig { returns(T::Boolean) }
+    attr_accessor :enabled
+
+    sig { params(enabled: T::Boolean).returns(Wrapper) }
+    def initialize(enabled = true); end
+
+    sig { params(string: String).returns(T.any(Rainbow::Presenter, Rainbow::NullPresenter)) }
+    def wrap(string); end
+  end
+
+  module X11ColorNames
+    NAMES = T.let(nil, T::Hash[Symbol, [Integer, Integer, Integer]])
+  end
+end
+
+sig { params(string: String).returns(Rainbow::Presenter) }
+def Rainbow(string); end

sorbet/rbi/sorbet-typed/lib/ruby/all/open3.rbi

@@ -0,0 +1,111 @@
+# This file is autogenerated. Do not edit it by hand. Regenerate it with:
+#   srb rbi sorbet-typed
+#
+# If you would like to make changes to this file, great! Please upstream any changes you make here:
+#
+#   https://github.com/sorbet/sorbet-typed/edit/master/lib/ruby/all/open3.rbi
+#
+# typed: strong
+
+module Open3
+  sig do
+    params(
+      cmd: T.any(String, T::Array[String]),
+      opts: T.untyped,
+      block: T.nilable(T.proc.params(stdin: IO, stdout: IO, stderr: IO, wait_thr: Process::Waiter).void)
+    ).returns([IO, IO, IO, Process::Waiter])
+  end
+  def self.popen3(*cmd, **opts, &block); end
+
+  sig do
+    params(
+      cmd: T.any(String, T::Array[String]),
+      opts: T.untyped,
+      block: T.nilable(T.proc.params(stdin: IO, stdout: IO, wait_thr: Process::Waiter).void)
+    ).returns([IO, IO, Process::Waiter])
+  end
+  def self.popen2(*cmd, **opts, &block); end
+
+  sig do
+    params(
+      cmd: T.any(String, T::Array[String]),
+      opts: T.untyped,
+      block: T.nilable(T.proc.params(stdin: IO, stdout_and_stderr: IO, wait_thr: Process::Waiter).void)
+    ).returns([IO, IO, Process::Waiter])
+  end
+  def self.popen2e(*cmd, **opts, &block); end
+
+  sig do
+    params(
+      cmd: T.any(String, T::Array[String]),
+      stdin_data: T.nilable(String),
+      binmode: T.any(FalseClass, TrueClass),
+      opts: T::Hash[Symbol, T.untyped]
+    ).returns([String, String, Process::Status])
+  end
+  def self.capture3(*cmd, stdin_data: '', binmode: false, **opts); end
+
+  sig do
+    params(
+      cmd: T.any(String, T::Array[String]),
+      stdin_data: T.nilable(String),
+      binmode: T.any(FalseClass, TrueClass),
+      opts: T::Hash[Symbol, T.untyped]
+    ).returns([String, Process::Status])
+  end
+  def self.capture2(*cmd, stdin_data: nil, binmode: false, **opts); end
+
+  sig do
+    params(
+      cmd: T.any(String, T::Array[String]),
+      stdin_data: T.nilable(String),
+      binmode: T.any(FalseClass, TrueClass),
+      opts: T::Hash[Symbol, T.untyped]
+    ).returns([String, Process::Status])
+  end
+  def self.capture2e(*cmd, stdin_data: nil, binmode: false, **opts); end
+
+  sig do
+    params(
+      cmds: T.any(String, T::Array[String]),
+      opts: T.untyped,
+      block: T.nilable(T.proc.params(first_stdin: IO, last_stdout: IO, wait_threads: T::Array[Process::Waiter]).void)
+    ).returns([IO, IO, T::Array[Process::Waiter]])
+  end
+  def self.pipeline_rw(*cmds, **opts, &block); end
+
+  sig do
+    params(
+      cmds: T.any(String, T::Array[String]),
+      opts: T.untyped,
+      block: T.nilable(T.proc.params(last_stdout: IO, wait_threads: T::Array[Process::Waiter]).void)
+    ).returns([IO, T::Array[Process::Waiter]])
+  end
+  def self.pipeline_r(*cmds, **opts, &block); end
+
+  sig do
+    params(
+      cmds: T.any(String, T::Array[String]),
+      opts: T.untyped,
+      block: T.nilable(T.proc.params(first_stdin: IO, wait_threads: T::Array[Process::Waiter]).void)
+    ).returns([IO, T::Array[Process::Waiter]])
+  end
+  def self.pipeline_w(*cmds, **opts, &block); end
+
+  sig do
+    params(
+      cmds: T.any(String, T::Array[String]),
+      opts: T.untyped,
+      block: T.nilable(T.proc.params(wait_threads: T::Array[Process::Waiter]).void)
+    ).returns(T::Array[Process::Waiter])
+  end
+  def self.pipeline_start(*cmds, **opts, &block); end
+
+  sig do
+    params(
+      cmds: T.any(String, T::Array[String]),
+      opts: T.untyped
+    ).returns(T::Array[Process::Status])
+  end
+  def self.pipeline(*cmds, **opts); end
+end

sorbet/rbi/sorbet-typed/lib/ruby/all/resolv.rbi

@@ -0,0 +1,543 @@
+# This file is autogenerated. Do not edit it by hand. Regenerate it with:
+#   srb rbi sorbet-typed
+#
+# If you would like to make changes to this file, great! Please upstream any changes you make here:
+#
+#   https://github.com/sorbet/sorbet-typed/edit/master/lib/ruby/all/resolv.rbi
+#
+# typed: strong
+
+class Resolv
+  sig { params(name: String).returns(String) }
+  def self.getaddress(name); end
+
+  sig { params(name: String).returns(T::Array[String]) }
+  def self.getaddresses(name); end
+
+  sig { params(name: String, block: T.proc.params(address: String).void).void }
+  def self.each_address(name, &block); end
+
+  sig { params(address: String).returns(String) }
+  def self.getname(address); end
+
+  sig { params(address: String).returns(T::Array[String]) }
+  def self.getnames(address); end
+
+  sig { params(address: String, proc: T.proc.params(name: String).void).void }
+  def self.each_name(address, &proc); end
+
+  sig { params(resolvers: [Hosts, DNS]).void }
+  def initialize(resolvers=[Hosts.new, DNS.new]); end
+
+  sig { params(name: String).returns(String) }
+  def getaddress(name); end
+
+  sig { params(name: String).returns(T::Array[String]) }
+  def getaddresses(name); end
+
+  sig { params(name: String, block: T.proc.params(address: String).void).void }
+  def each_address(name, &block); end
+
+  sig { params(address: String).returns(String) }
+  def getname(address); end
+
+  sig { params(address: String).returns(T::Array[String]) }
+  def getnames(address); end
+
+  sig { params(address: String, proc: T.proc.params(name: String).void).void }
+  def each_name(address, &proc); end
+
+  class ResolvError < StandardError; end
+  class ResolvTimeout < Timeout::Error; end
+
+  class Hosts
+    DefaultFileName = T.let(T.unsafe(nil), String)
+
+    sig { params(filename: String).void }
+    def initialize(filename = DefaultFileName); end
+
+    sig { params(name: String).returns(String) }
+    def getaddress(name); end
+
+    sig { params(name: String).returns(T::Array[String]) }
+    def getaddresses(name); end
+
+    sig { params(name: String, block: T.proc.params(address: String).void).void }
+    def each_address(name, &block); end
+
+    sig { params(address: String).returns(String) }
+    def getname(address); end
+
+    sig { params(address: String).returns(T::Array[String]) }
+    def getnames(address); end
+
+    sig { params(address: String, proc: T.proc.params(name: String).void).void }
+    def each_name(address, &proc); end
+  end
+
+  class DNS
+    Port = T.let(T.unsafe(nil), Integer)
+
+    UDPSize = T.let(T.unsafe(nil), Integer)
+
+    sig do
+      params(
+        config_info: T.any(
+          NilClass,
+          String,
+          { nameserver: T.any(String, T::Array[String]), search: T::Array[String], ndots: Integer },
+          { nameserver_port: T::Array[[String, Integer]], search: T::Array[String], ndots: Integer }
+        )
+      ).returns(Resolv::DNS)
+    end
+    def self.open(config_info = nil); end
+
+    sig do
+      params(
+        config_info: T.any(
+          NilClass,
+          String,
+          { nameserver: T.any(String, T::Array[String]), search: T::Array[String], ndots: Integer },
+          { nameserver_port: T::Array[[String, Integer]], search: T::Array[String], ndots: Integer }
+        )
+      ).void
+    end
+    def initialize(config_info = nil); end
+
+    sig { params(values: T.any(NilClass, Integer, T::Array[Integer])).void }
+    def timeouts=(values); end
+
+    sig { void }
+    def close; end
+
+    sig { params(name: String).returns(String) }
+    def getaddress(name); end
+
+    sig { params(name: String).returns(T::Array[String]) }
+    def getaddresses(name); end
+
+    sig { params(name: String, block: T.proc.params(address: String).void).void }
+    def each_address(name, &block); end
+
+    sig { params(address: String).returns(String) }
+    def getname(address); end
+
+    sig { params(address: String).returns(T::Array[String]) }
+    def getnames(address); end
+
+    sig { params(address: String, proc: T.proc.params(name: String).void).void }
+    def each_name(address, &proc); end
+
+    sig do
+      params(
+        name: T.any(String, Resolv::DNS::Name),
+        typeclass: T.class_of(Resolv::DNS::Resource)
+      ).returns(Resolv::DNS::Resource)
+    end
+    def getresource(name, typeclass); end
+
+    sig do
+      params(
+        name: T.any(String, Resolv::DNS::Name),
+        typeclass: T.class_of(Resolv::DNS::Resource)
+      ).returns(T::Array[Resolv::DNS::Resource])
+    end
+    def getresources(name, typeclass); end
+
+    sig do
+      params(
+        name: T.any(String, Resolv::DNS::Name),
+        typeclass: T.class_of(Resolv::DNS::Resource),
+        proc: T.proc.params(resource: Resolv::DNS::Resource).void
+      ).void
+    end
+    def each_resource(name, typeclass, &proc); end
+
+    class DecodeError < StandardError; end
+    class EncodeError < StandardError; end
+
+    class Name
+      sig { params(arg: T.any(String, Resolv::DNS::Name)).returns(Resolv::DNS::Name) }
+      def self.create(arg); end
+
+      sig { params(labels: T::Array[String], absolute: T.any(FalseClass, TrueClass)).void }
+      def initialize(labels, absolute=true); end
+
+      sig { returns(T.any(FalseClass, TrueClass)) }
+      def absolute?; end
+
+      sig { params(other: Resolv::DNS::Name).returns(T.any(FalseClass, TrueClass)) }
+      def subdomain_of?(other); end
+    end
+
+    class Query; end
+
+    class Resource < Query
+      sig { returns(T.nilable(Integer)) }
+      attr_reader :ttl
+
+      sig { void }
+      def initialize
+        @ttl = T.let(T.unsafe(nil), T.nilable(Integer))
+      end
+
+      class Generic < Resource
+        sig { params(data: T.untyped).void }
+        def initialize(data)
+          @data = T.let(T.unsafe(nil), T.untyped)
+        end
+
+        sig { returns(T.untyped) }
+        attr_reader :data
+      end
+
+      class DomainName < Resource
+        sig { params(name: String).void }
+        def initialize(name)
+          @name = T.let(T.unsafe(nil), String)
+        end
+
+        sig { returns(String) }
+        attr_reader :name
+      end
+
+      class NS < DomainName; end
+
+      class CNAME < DomainName; end
+
+      class SOA < Resource
+        sig do
+          params(
+            mname: String,
+            rname: String,
+            serial: Integer,
+            refresh: Integer,
+            retry_: Integer,
+            expire: Integer,
+            minimum: Integer
+          ).void
+        end
+        def initialize(mname, rname, serial, refresh, retry_, expire, minimum)
+          @mname = T.let(T.unsafe(nil), String)
+          @rname = T.let(T.unsafe(nil), String)
+          @serial = T.let(T.unsafe(nil), Integer)
+          @refresh = T.let(T.unsafe(nil), Integer)
+          @retry = T.let(T.unsafe(nil), Integer)
+          @expire = T.let(T.unsafe(nil), Integer)
+          @minimum = T.let(T.unsafe(nil), Integer)
+        end
+
+        sig { returns(String) }
+        attr_reader :mname
+
+        sig { returns(String) }
+        attr_reader :rname
+
+        sig { returns(Integer) }
+        attr_reader :serial
+
+        sig { returns(Integer) }
+        attr_reader :refresh
+
+        sig { returns(Integer) }
+        attr_reader :retry
+
+        sig { returns(Integer) }
+        attr_reader :expire
+
+        sig { returns(Integer) }
+        attr_reader :minimum
+      end
+
+      class PTR < DomainName; end
+
+      class HINFO < Resource
+        sig { params(cpu: String, os: String).void }
+        def initialize(cpu, os)
+          @cpu = T.let(T.unsafe(nil), String)
+          @os = T.let(T.unsafe(nil), String)
+        end
+
+        sig { returns(String) }
+        attr_reader :cpu
+
+        sig { returns(String) }
+        attr_reader :os
+      end
+
+      class MINFO < Resource
+        sig { params(rmailbx: String, emailbx: String).void }
+        def initialize(rmailbx, emailbx)
+          @rmailbx = T.let(T.unsafe(nil), String)
+          @emailbx = T.let(T.unsafe(nil), String)
+        end
+
+        sig { returns(String) }
+        attr_reader :rmailbx
+
+        sig { returns(String) }
+        attr_reader :emailbx
+      end
+
+      class MX < Resource
+        sig { params(preference: Integer, exchange: String).void }
+        def initialize(preference, exchange)
+          @preference = T.let(T.unsafe(nil), Integer)
+          @exchange = T.let(T.unsafe(nil), String)
+        end
+
+        sig { returns(Integer) }
+        attr_reader :preference
+
+        sig { returns(String) }
+        attr_reader :exchange
+      end
+
+      class TXT < Resource
+        sig { params(first_string: String, rest_strings: String).void }
+        def initialize(first_string, *rest_strings)
+          @strings = T.let(T.unsafe(nil), T::Array[String])
+        end
+
+        sig { returns(T::Array[String]) }
+        attr_reader :strings
+
+        sig { returns(String) }
+        def data; end
+      end
+
+      class LOC < Resource
+        sig do
+          params(
+            version: String,
+            ssize: T.any(String, Resolv::LOC::Size),
+            hprecision: T.any(String, Resolv::LOC::Size),
+            vprecision: T.any(String, Resolv::LOC::Size),
+            latitude: T.any(String, Resolv::LOC::Coord),
+            longitude: T.any(String, Resolv::LOC::Coord),
+            altitude: T.any(String, Resolv::LOC::Alt)
+          ).void
+        end
+        def initialize(version, ssize, hprecision, vprecision, latitude, longitude, altitude)
+          @version = T.let(T.unsafe(nil), String)
+          @ssize = T.let(T.unsafe(nil), Resolv::LOC::Size)
+          @hprecision = T.let(T.unsafe(nil), Resolv::LOC::Size)
+          @vprecision = T.let(T.unsafe(nil), Resolv::LOC::Size)
+          @latitude = T.let(T.unsafe(nil), Resolv::LOC::Coord)
+          @longitude = T.let(T.unsafe(nil), Resolv::LOC::Coord)
+          @altitude = T.let(T.unsafe(nil), Resolv::LOC::Alt)
+        end
+
+        sig { returns(String) }
+        attr_reader :version
+
+        sig { returns(Resolv::LOC::Size) }
+        attr_reader :ssize
+
+        sig { returns(Resolv::LOC::Size) }
+        attr_reader :hprecision
+
+        sig { returns(Resolv::LOC::Size) }
+        attr_reader :vprecision
+
+        sig { returns(Resolv::LOC::Coord) }
+        attr_reader :latitude
+
+        sig { returns(Resolv::LOC::Coord) }
+        attr_reader :longitude
+
+        sig { returns(Resolv::LOC::Alt) }
+        attr_reader :altitude
+      end
+
+      class ANY < Query; end
+
+      module IN
+        class A < Resource
+          sig { params(address: String).void }
+          def initialize(address)
+            @address = T.let(T.unsafe(nil), Resolv::IPv4)
+          end
+
+          sig { returns(Resolv::IPv4) }
+          attr_reader :address
+        end
+
+        class WKS < Resource
+          sig { params(address: String, protocol: Integer, bitmap: String).void }
+          def initialize(address, protocol, bitmap)
+            @address = T.let(T.unsafe(nil), Resolv::IPv4)
+            @protocol = T.let(T.unsafe(nil), Integer)
+            @bitmap = T.let(T.unsafe(nil), String)
+          end
+
+          sig { returns(Resolv::IPv4) }
+          attr_reader :address
+
+          sig { returns(Integer) }
+          attr_reader :protocol
+
+          sig { returns(String) }
+          attr_reader :bitmap
+        end
+
+        class AAAA < Resource
+          sig { params(address: String).void }
+          def initialize(address)
+            @address = T.let(T.unsafe(nil), Resolv::IPv6)
+          end
+
+          sig { returns(Resolv::IPv6) }
+          attr_reader :address
+        end
+
+        class SRV < Resource
+          # Create a SRV resource record.
+          #
+          # See the documentation for #priority, #weight, #port and #target
+          # for +priority+, +weight+, +port and +target+ respectively.
+
+          sig do
+            params(
+              priority: T.any(Integer, String),
+              weight: T.any(Integer, String),
+              port: T.any(Integer, String),
+              target: T.any(String, Resolv::DNS::Name)
+            ).void
+          end
+          def initialize(priority, weight, port, target)
+            @priority = T.let(T.unsafe(nil), Integer)
+            @weight = T.let(T.unsafe(nil), Integer)
+            @port = T.let(T.unsafe(nil), Integer)
+            @target = T.let(T.unsafe(nil), Resolv::DNS::Name)
+          end
+
+          sig { returns(Integer) }
+          attr_reader :priority
+
+          sig { returns(Integer) }
+          attr_reader :weight
+
+          sig { returns(Integer) }
+          attr_reader :port
+
+          sig { returns(Resolv::DNS::Name) }
+          attr_reader :target
+        end
+      end
+    end
+  end
+
+  class IPv4
+    Regex256 = T.let(T.unsafe(nil), Regexp)
+    Regex = T.let(T.unsafe(nil), Regexp)
+
+    sig { params(arg: T.any(String, Resolv::IPv4)).returns(Resolv::IPv4) }
+    def self.create(arg); end
+
+    sig { params(address: String).void }
+    def initialize(address)
+      @address = T.let(T.unsafe(nil), String)
+    end
+
+    sig { returns(String) }
+    attr_reader :address
+
+    sig { returns(DNS::Name) }
+    def to_name; end
+  end
+
+  class IPv6
+    Regex_8Hex = T.let(T.unsafe(nil), Regexp)
+    Regex_CompressedHex = T.let(T.unsafe(nil), Regexp)
+    Regex_6Hex4Dec = T.let(T.unsafe(nil), Regexp)
+    Regex_CompressedHex4Dec = T.let(T.unsafe(nil), Regexp)
+    Regex = T.let(T.unsafe(nil), Regexp)
+
+    sig { params(arg: T.any(String, Resolv::IPv6)).returns(Resolv::IPv6) }
+    def self.create(arg); end
+
+    sig { params(address: String).void }
+    def initialize(address)
+      @address = T.let(T.unsafe(nil), String)
+    end
+
+    sig { returns(String) }
+    attr_reader :address
+
+    sig { returns(DNS::Name) }
+    def to_name; end
+  end
+
+  class MDNS < DNS
+    Port = T.let(T.unsafe(nil), Integer)
+    AddressV4 = T.let(T.unsafe(nil), String)
+    AddressV6 = T.let(T.unsafe(nil), String)
+    Addresses = T.let(T.unsafe(nil), [[String, Integer], [String, Integer]])
+
+    sig do
+      params(
+        config_info: T.any(
+          NilClass,
+          { nameserver: T.any(String, T::Array[String]), search: T::Array[String], ndots: Integer },
+          { nameserver_port: T::Array[[String, Integer]], search: T::Array[String], ndots: Integer }
+        )
+      ).void
+    end
+    def initialize(config_info = nil); end
+  end
+
+  module LOC
+    class Size
+      Regex = T.let(T.unsafe(nil), Regexp)
+
+      sig { params(arg: T.any(String, Resolv::LOC::Size)).returns(Resolv::LOC::Size) }
+      def self.create(arg); end
+
+      sig { params(scalar: String).void }
+      def initialize(scalar)
+        @scalar = T.let(T.unsafe(nil), String)
+      end
+
+      sig { returns(String) }
+      attr_reader :scalar
+    end
+
+    class Coord
+      Regex = T.let(T.unsafe(nil), Regexp)
+
+      sig { params(arg: T.any(String, Resolv::LOC::Coord)).returns(Resolv::LOC::Coord) }
+      def self.create(arg); end
+
+      sig { params(coordinates: String, orientation: T.enum(%w[lat lon])).void }
+      def initialize(coordinates, orientation)
+        @coordinates = T.let(T.unsafe(nil), String)
+        @orientation = T.let(T.unsafe(nil), T.enum(%w[lat lon]))
+      end
+
+      sig { returns(String) }
+      attr_reader :coordinates
+
+      sig { returns(T.enum(%w[lat lon])) }
+      attr_reader :orientation
+    end
+
+    class Alt
+      Regex = T.let(T.unsafe(nil), Regexp)
+
+      sig { params(arg: T.any(String, Resolv::LOC::Alt)).returns(Resolv::LOC::Alt) }
+      def self.create(arg); end
+
+      sig { params(altitude: String).void }
+      def initialize(altitude)
+        @altitude = T.let(T.unsafe(nil), String)
+      end
+
+      sig { returns(String) }
+      attr_reader :altitude
+    end
+  end
+
+  DefaultResolver = T.let(T.unsafe(nil), Resolv)
+  AddressRegex = T.let(T.unsafe(nil), Regexp)
+end

spec/daemon_spec.rb

@@ -1,3 +1,4 @@
+# typed: false
 require 'spec_helper'
 
 describe Dyndnsd::Daemon do

spec/spec_helper.rb

@@ -1,3 +1,4 @@
+# typed: strong
 
 require 'rubygems'
 require 'bundler/setup'

spec/support/dummy_database.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 require 'forwardable'
 

spec/support/dummy_updater.rb

@@ -1,3 +1,4 @@
+# typed: true
 
 module Dyndnsd
   module Updater