release: 2.1.1

- including review suggestions from @jgraichen

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 *.lock
 pkg/*
+.yardoc

.rubocop.yml

@@ -1,14 +1,9 @@
-inherit_from: .rubocop_todo.yml
-
 AllCops:
   TargetRubyVersion: '2.3'
 
 Gemspec/OrderedDependencies:
   Enabled: false
 
-Layout/AlignHash:
-  Enabled: false
-
 Layout/EmptyLineAfterGuardClause:
   Enabled: false
 
@@ -16,9 +11,15 @@ Layout/EmptyLineAfterGuardClause:
 Layout/EmptyLinesAroundArguments:
   Enabled: false
 
-Layout/LeadingBlankLines:
+Layout/HashAlignment:
   Enabled: false
 
+Layout/LeadingEmptyLines:
+  Enabled: false
+
+Layout/LineLength:
+  Max: 200
+
 Layout/SpaceInsideHashLiteralBraces:
   Enabled: false
 
@@ -34,16 +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:
@@ -64,6 +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.

.solargraph.yml

@@ -0,0 +1,16 @@
+---
+include:
+- "**/*.rb"
+- "bin/dyndnsd"
+exclude:
+- spec/**/*
+- test/**/*
+- vendor/**/*
+- ".bundle/**/*"
+require: []
+domains: []
+reporters:
+- rubocop
+- require_not_found
+require_paths: []
+max_files: 5000

.travis.yml

@@ -1,8 +1,12 @@
 ---
-sudo: false
+os: linux
 language: ruby
 rvm:
-  - 2.6
-  - 2.5
-  - 2.4
-  - 2.3
+- 2.7
+- 2.6
+- 2.5
+- 2.4
+- 2.3
+
+script:
+- bundle exec rake travis

CHANGELOG.md

@@ -1,5 +1,19 @@
 # Changelog
 
+## 2.1.1 (March 1, 2020)
+
+IMPROVEMENTS:
+
+- Fix potential `nil` cases detected by [Sorbet](https://sorbet.org) including refactorings
+
+## 2.1.0 (March 1, 2020)
+
+IMPROVEMENTS:
+
+- Add Ruby 2.7 support
+- Add [solargraph](https://github.com/castwide/solargraph) to dev tooling as Ruby Language Server usable e.g. for IDEs (used solargraph version not compatible with Ruby 2.7 as bundler-audit 0.6.x requires old `thor` gem)
+- Document code using YARD tags, e.g. for type information and better code completion
+
 ## 2.0.0 (January 25, 2019)
 
 IMPROVEMENTS:
@@ -9,7 +23,7 @@ IMPROVEMENTS:
 - Better code maintainability by refactorings
 - Update dependencies, mainly `rack` to new major version 2
 - Add Ruby 2.5 and Ruby 2.6 support
-- Add experimental [OpenTracing](http://opentracing.io/) support with [CNCF Jaeger](https://github.com/jaegertracing/jaeger)
+- Add experimental [OpenTracing](https://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

@@ -7,4 +7,16 @@ RSpec::Core::RakeTask.new(:spec)
 RuboCop::RakeTask.new
 Bundler::Audit::Task.new
 
+desc 'Should be run by developer once to prepare initial solargraph usage (fill caches etc.)'
+task :'solargraph:init' do
+  sh 'solargraph download-core'
+end
+
+desc 'Run experimental solargraph type checker'
+task :'solargraph:tc' do
+  sh 'solargraph typecheck'
+end
+
 task default: [:rubocop, :spec, 'bundle:audit']
+
+task travis: [:default, :'solargraph:tc']

dyndnsd.gemspec

@@ -24,13 +24,14 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'json'
   s.add_runtime_dependency 'metriks'
   s.add_runtime_dependency 'opentracing', '~> 0.5.0'
-  s.add_runtime_dependency 'rack-tracer', '~> 0.8.0'
+  s.add_runtime_dependency 'rack-tracer', '~> 0.9.0'
   s.add_runtime_dependency 'jaeger-client', '~> 0.10.0'
 
   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', '~> 0.63.0'
-  s.add_development_dependency 'bundler-audit'
+  s.add_development_dependency 'rubocop', '~> 0.80.0'
+  s.add_development_dependency 'bundler-audit', '~> 0.6.0'
+  s.add_development_dependency 'solargraph'
 end

lib/dyndnsd.rb

@@ -21,21 +21,32 @@ require 'dyndnsd/textfile_reporter'
 require 'dyndnsd/version'
 
 module Dyndnsd
+  # @return [Logger]
   def self.logger
     @logger
   end
 
+  # @param logger [Logger]
+  # @return [Logger]
   def self.logger=(logger)
     @logger = logger
   end
 
   class LogFormatter
+    # @param lvl [Object]
+    # @param _time [DateTime]
+    # @param _progname [String]
+    # @param msg [Object]
+    # @return [String]
     def call(lvl, _time, _progname, msg)
       format("[%s] %-5s %s\n", Time.now.strftime('%Y-%m-%d %H:%M:%S'), lvl, msg.to_s)
     end
   end
 
   class Daemon
+    # @param config [Hash{String => Object}]
+    # @param db [Dyndnsd::Database]
+    # @param updater [#update]
     def initialize(config, db, updater)
       @users = config['users']
       @domain = config['domain']
@@ -51,6 +62,9 @@ module Dyndnsd
       end
     end
 
+    # @param username [String]
+    # @param password [String]
+    # @return [Boolean]
     def authorized?(username, password)
       Helper.span('check_authorized') do |span|
         span.set_tag('dyndnsd.user', username)
@@ -64,6 +78,8 @@ module Dyndnsd
       end
     end
 
+    # @param env [Hash{String => String}]
+    # @return [Array{Integer,Hash{String => String},Array{String}}]
     def call(env)
       return [422, {'X-DynDNS-Response' => 'method_forbidden'}, []] if env['REQUEST_METHOD'] != 'GET'
       return [422, {'X-DynDNS-Response' => 'not_found'}, []] if env['PATH_INFO'] != '/nic/update'
@@ -71,6 +87,7 @@ module Dyndnsd
       handle_dyndns_request(env)
     end
 
+    # @return [void]
     def self.run!
       if ARGV.length != 1
         puts 'Usage: dyndnsd config_file'
@@ -95,8 +112,14 @@ 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
 
@@ -109,6 +132,8 @@ module Dyndnsd
 
     private
 
+    # @param params [Hash{String => String}]
+    # @return [Array{String}]
     def extract_v4_and_v6_address(params)
       return [] if !(params['myip'])
       begin
@@ -120,6 +145,9 @@ module Dyndnsd
       end
     end
 
+    # @param env [Hash{String => String}]
+    # @param params [Hash{String => String}]
+    # @return [Array{String}]
     def extract_myips(env, params)
       # require presence of myip parameter as valid IPAddr (v4) and valid myip6
       return extract_v4_and_v6_address(params) if params.key?('myip6')
@@ -134,6 +162,9 @@ module Dyndnsd
       [env['REMOTE_ADDR']]
     end
 
+    # @param hostnames [String]
+    # @param myips [Array{String}]
+    # @return [Array{Symbol}]
     def process_changes(hostnames, myips)
       changes = []
       Helper.span('process_changes') do |span|
@@ -158,6 +189,7 @@ module Dyndnsd
       changes
     end
 
+    # @return [void]
     def update_db
       @db['serial'] += 1
       Dyndnsd.logger.info "Committing update ##{@db['serial']}"
@@ -166,6 +198,8 @@ module Dyndnsd
       Metriks.meter('updates.committed').mark
     end
 
+    # @param env [Hash{String => String}]
+    # @return [Array{Integer,Hash{String => String},Array{String}}]
     def handle_dyndns_request(env)
       params = Rack::Utils.parse_query(env['QUERY_STRING'])
 
@@ -204,6 +238,8 @@ module Dyndnsd
 
     # SETUP
 
+    # @param config [Hash{String => Object}]
+    # @return [void]
     private_class_method def self.setup_logger(config)
       if config['logfile']
         Dyndnsd.logger = Logger.new(config['logfile'])
@@ -215,6 +251,7 @@ module Dyndnsd
       Dyndnsd.logger.formatter = LogFormatter.new
     end
 
+    # @return [void]
     private_class_method def self.setup_traps
       Signal.trap('INT') do
         Dyndnsd.logger.info 'Quitting...'
@@ -226,6 +263,8 @@ module Dyndnsd
       end
     end
 
+    # @param config [Hash{String => Object}]
+    # @return [void]
     private_class_method def self.setup_monitoring(config)
       # configure metriks
       if config['graphite']
@@ -253,6 +292,8 @@ module Dyndnsd
       end
     end
 
+    # @param config [Hash{String => Object}]
+    # @return [void]
     private_class_method def self.setup_tracing(config)
       # configure OpenTracing
       if config.dig('tracing', 'jaeger')
@@ -267,10 +308,12 @@ module Dyndnsd
       end
     end
 
+    # @param config [Hash{String => Object}]
+    # @return [void]
     private_class_method def self.setup_rack(config)
       # configure daemon
       db = Database.new(config['db'])
-      updater = Updater::CommandWithBindZone.new(config['domain'], config['updater']['params']) if config['updater']['name'] == 'command_with_bind_zone'
+      updater = Updater::CommandWithBindZone.new(config['domain'], config.dig('updater', 'params')) if config.dig('updater', 'name') == 'command_with_bind_zone'
       daemon = Daemon.new(config, db, updater)
 
       # configure rack

lib/dyndnsd/database.rb

@@ -7,19 +7,22 @@ module Dyndnsd
 
     def_delegators :@db, :[], :[]=, :each, :has_key?
 
+    # @param db_file [String]
     def initialize(db_file)
       @db_file = db_file
     end
 
+    # @return [void]
     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
       @db_hash = @db.hash
     end
 
+    # @return [void]
     def save
       Helper.span('database_save') do |_span|
         File.open(@db_file, 'w') { |f| JSON.dump(@db, f) }
@@ -27,6 +30,7 @@ module Dyndnsd
       end
     end
 
+    # @return [Boolean]
     def changed?
       @db_hash != @db.hash
     end

lib/dyndnsd/generator/bind.rb

@@ -2,6 +2,8 @@
 module Dyndnsd
   module Generator
     class Bind
+      # @param domain [String]
+      # @param config [Hash{String => Object}]
       def initialize(domain, config)
         @domain = domain
         @ttl = config['ttl']
@@ -10,6 +12,8 @@ module Dyndnsd
         @additional_zone_content = config['additional_zone_content']
       end
 
+      # @param db [Dyndnsd::Database]
+      # @return [String]
       def generate(db)
         out = []
         out << "$TTL #{@ttl}"

lib/dyndnsd/helper.rb

@@ -3,6 +3,9 @@ require 'ipaddr'
 
 module Dyndnsd
   class Helper
+    # @param hostname [String]
+    # @param domain [String]
+    # @return [Boolean]
     def self.fqdn_valid?(hostname, domain)
       return false if hostname.length < domain.length + 2
       return false if !hostname.end_with?(domain)
@@ -11,6 +14,8 @@ module Dyndnsd
       true
     end
 
+    # @param ip [String]
+    # @return [Boolean]
     def self.ip_valid?(ip)
       IPAddr.new(ip)
       true
@@ -18,15 +23,26 @@ module Dyndnsd
       false
     end
 
+    # @param username [String]
+    # @param password [String]
+    # @param users [Hash]
+    # @return [Boolean]
     def self.user_allowed?(username, password, users)
       (users.key? username) && (users[username]['password'] == password)
     end
 
+    # @param hostname [String]
+    # @param myips [Array]
+    # @param hosts [Hash]
+    # @return [Boolean]
     def self.changed?(hostname, myips, hosts)
       # myips order is always deterministic
       ((!hosts.include? hostname) || (hosts[hostname] != myips)) && !myips.empty?
     end
 
+    # @param operation [String]
+    # @param block [Proc]
+    # @return [void]
     def self.span(operation, &block)
       scope = OpenTracing.start_active_span(operation)
       span = scope.span
@@ -41,7 +57,7 @@ module Dyndnsd
           'error.kind': e.class.to_s,
           'error.object': e,
           message: e.message,
-          stack: e.backtrace.join("\n")
+          stack: e.backtrace&.join("\n") || ''
         )
         raise
       ensure

lib/dyndnsd/responder/dyndns_style.rb

@@ -2,10 +2,13 @@
 module Dyndnsd
   module Responder
     class DynDNSStyle
+      # @param app [#call]
       def initialize(app)
         @app = app
       end
 
+      # @param env [Hash{String => String}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def call(env)
         @app.call(env).tap do |status_code, headers, body|
           if headers.key?('X-DynDNS-Response')
@@ -18,6 +21,10 @@ module Dyndnsd
 
       private
 
+      # @param status_code [Integer]
+      # @param headers [Hash{String => String}]
+      # @param body [Array{String}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def decorate_dyndnsd_response(status_code, headers, body)
         if status_code == 200
           [200, {'Content-Type' => 'text/plain'}, [get_success_body(body[0], body[1])]]
@@ -26,6 +33,10 @@ module Dyndnsd
         end
       end
 
+      # @param status_code [Integer]
+      # @param headers [Hash{String => String}]
+      # @param _body [Array{String}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def decorate_other_response(status_code, headers, _body)
         if status_code == 400
           [status_code, headers, ['Bad Request']]
@@ -34,10 +45,14 @@ module Dyndnsd
         end
       end
 
+      # @param changes [Array{Symbol}]
+      # @param myips [Array{String}]
+      # @return [String]
       def get_success_body(changes, myips)
         changes.map { |change| "#{change} #{myips.join(' ')}" }.join("\n")
       end
 
+      # @return [Hash{String => Object}]
       def error_response_map
         {
           # general http errors

lib/dyndnsd/responder/rest_style.rb

@@ -2,10 +2,13 @@
 module Dyndnsd
   module Responder
     class RestStyle
+      # @param app [#call]
       def initialize(app)
         @app = app
       end
 
+      # @param env [Hash{String => String}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def call(env)
         @app.call(env).tap do |status_code, headers, body|
           if headers.key?('X-DynDNS-Response')
@@ -18,6 +21,10 @@ module Dyndnsd
 
       private
 
+      # @param status_code [Integer]
+      # @param headers [Hash{String => String}]
+      # @param body [Array{String}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def decorate_dyndnsd_response(status_code, headers, body)
         if status_code == 200
           [200, {'Content-Type' => 'text/plain'}, [get_success_body(body[0], body[1])]]
@@ -26,6 +33,10 @@ module Dyndnsd
         end
       end
 
+      # @param status_code [Integer]
+      # @param headers [Hash{String => String}]
+      # @param _body [Array{String}]
+      # @return [Array{Integer,Hash{String => String},Array{String}}]
       def decorate_other_response(status_code, headers, _body)
         if status_code == 400
           [status_code, headers, ['Bad Request']]
@@ -34,10 +45,14 @@ module Dyndnsd
         end
       end
 
+      # @param changes [Array{Symbol}]
+      # @param myips [Array{String}]
+      # @return [String]
       def get_success_body(changes, myips)
         changes.map { |change| change == :good ? "Changed to #{myips.join(' ')}" : "No change needed for #{myips.join(' ')}" }.join("\n")
       end
 
+      # @return [Hash{String => Object}]
       def error_response_map
         {
           # general http errors

lib/dyndnsd/textfile_reporter.rb

@@ -5,8 +5,11 @@ require 'metriks'
 
 module Dyndnsd
   class TextfileReporter
+    # @return [String]
     attr_reader :file
 
+    # @param file [String]
+    # @param options [Hash{Symbol => Object}]
     def initialize(file, options = {})
       @file = file
 
@@ -17,6 +20,7 @@ module Dyndnsd
       @on_error  = options[:on_error] || proc { |ex| }
     end
 
+    # @return [void]
     def start
       @thread ||= Thread.new do
         loop do
@@ -33,16 +37,19 @@ module Dyndnsd
       end
     end
 
+    # @return [void]
     def stop
       @thread&.kill
       @thread = nil
     end
 
+    # @return [void]
     def restart
       stop
       start
     end
 
+    # @return [void]
     def write
       File.open(@file, 'w') do |f|
         @registry.each do |name, metric|
@@ -85,6 +92,12 @@ module Dyndnsd
       end
     end
 
+    # @param file [String]
+    # @param base_name [String]
+    # @param metric [Object]
+    # @param keys [Array{Symbol}]
+    # @param snapshot_keys [Array{Symbol}]
+    # @return [void]
     def write_metric(file, base_name, metric, keys, snapshot_keys = [])
       time = Time.now.to_i
 

lib/dyndnsd/updater/command_with_bind_zone.rb

@@ -2,25 +2,29 @@
 module Dyndnsd
   module Updater
     class CommandWithBindZone
+      # @param domain [String]
+      # @param config [Hash{String => Object}]
       def initialize(domain, config)
         @zone_file = config['zone_file']
         @command = config['command']
         @generator = Generator::Bind.new(domain, config)
       end
 
-      def update(zone)
+      # @param db [Dyndnsd::Database]
+      # @return [void]
+      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 +1,4 @@
 
 module Dyndnsd
-  VERSION = '2.0.0'.freeze
+  VERSION = '2.1.1'.freeze
 end