Class: HealthCheck::Utils

Inherits:
Object
  • Object
show all
Defined in:
lib/health_check/utils.rb

Constant Summary collapse

@@default_smtp_settings = 
{
    :address              => "localhost",
    :port                 => 25,
    :domain               => 'localhost.localdomain',
    :user_name            => nil,
    :password             => nil,
    :authentication       => nil,
    :enable_starttls_auto => true,
}

Class Method Summary collapse

Class Method Details

.check_cache ⇒ Object 



158
159
160
 
# File 'lib/health_check/utils.rb', line 158

def self.check_cache
  Rails.cache.write('__health_check_cache_test__', 'ok', :expires_in => 1.second) ? '' : 'Unable to write to cache. '
end

.check_email ⇒ Object 



111
112
113
114
115
116
117
118
119
120
 
# File 'lib/health_check/utils.rb', line 111

def self.check_email
  case ActionMailer::Base.delivery_method
    when :smtp
      HealthCheck::Utils.check_smtp(ActionMailer::Base.smtp_settings, HealthCheck.smtp_timeout)
    when :sendmail
      HealthCheck::Utils.check_sendmail(ActionMailer::Base.sendmail_settings)
    else
      ''
  end
end

.check_sendmail(settings) ⇒ Object 



122
123
124
 
# File 'lib/health_check/utils.rb', line 122

def self.check_sendmail(settings)
  File.executable?(settings[:location]) ? '' : 'no sendmail executable found. '
end

.check_smtp(settings, timeout) ⇒ Object 



126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
 
# File 'lib/health_check/utils.rb', line 126

def self.check_smtp(settings, timeout)
  status = ''
  begin
    if @skip_external_checks
      status = '221'
    else
      Timeout::timeout(timeout) do |timeout_length|
        t = TCPSocket.new(settings[:address], settings[:port])
        begin
          status = t.gets
          while status != nil && status !~ /^2/
            status = t.gets
          end
          t.puts "HELO #{settings[:domain]}\r"
          while status != nil && status !~ /^250/
            status = t.gets
          end
          t.puts "QUIT\r"
          status = t.gets
        ensure
          t.close
        end
      end
    end
  rescue Errno::EBADF => ex
    status = "Unable to connect to service"
  rescue Exception => ex
    status = ex.to_s
  end
  (status =~ /^221/) ? '' : "SMTP: #{status || 'unexpected EOF on socket'}. "
end

.db_migrate_path ⇒ Object 



85
86
87
88
 
# File 'lib/health_check/utils.rb', line 85

def self.db_migrate_path
  # Lazy initialisation so Rails.root will be defined
  @@db_migrate_path ||= File.join(Rails.root, 'db', 'migrate')
end

.db_migrate_path=(value) ⇒ Object 



90
91
92
 
# File 'lib/health_check/utils.rb', line 90

def self.db_migrate_path=(value)
  @@db_migrate_path = value
end

.get_database_version ⇒ Object 



98
99
100
 
# File 'lib/health_check/utils.rb', line 98

def self.get_database_version
  ActiveRecord::Migrator.current_version if defined?(ActiveRecord)
end

.get_migration_version(dir = self.db_migrate_path) ⇒ Object 



102
103
104
105
106
107
108
109
 
# File 'lib/health_check/utils.rb', line 102

def self.get_migration_version(dir = self.db_migrate_path)
  latest_migration = nil
  Dir[File.join(dir, "[0-9]*_*.rb")].each do |f|
    l = f.scan(/0*([0-9]+)_[_.a-zA-Z0-9]*.rb/).first.first rescue -1
    latest_migration = l if !latest_migration || l.to_i > latest_migration.to_i
  end
  latest_migration
end

.mailer_configured? ⇒ Boolean

Returns:

  • (Boolean) 


94
95
96
 
# File 'lib/health_check/utils.rb', line 94

def self.mailer_configured?
  defined?(ActionMailer::Base) && (ActionMailer::Base.delivery_method != :smtp || HealthCheck::Utils.default_smtp_settings != ActionMailer::Base.smtp_settings)
end

.process_checks(checks, called_from_middleware = false) ⇒ Object

process an array containing a list of checks



21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
 
# File 'lib/health_check/utils.rb', line 21

def self.process_checks(checks, called_from_middleware = false)
  errors = ''
  checks.each do |check|
    case check
      when 'and', 'site'
        # do nothing
      when "database"
        HealthCheck::Utils.get_database_version
      when "email"
        errors << HealthCheck::Utils.check_email
      when "emailconf"
        errors << HealthCheck::Utils.check_email if HealthCheck::Utils.mailer_configured?
      when "migrations", "migration"
        if defined?(ActiveRecord::Migration) and ActiveRecord::Migration.respond_to?(:check_pending!)
          # Rails 4+
          begin
            ActiveRecord::Migration.check_pending!
          rescue ActiveRecord::PendingMigrationError => ex
              errors << ex.message
          end
        else
          database_version  = HealthCheck::Utils.get_database_version
          migration_version = HealthCheck::Utils.get_migration_version
          if database_version.to_i != migration_version.to_i
            errors << "Current database version (#{database_version}) does not match latest migration (#{migration_version}). "
          end
        end
      when 'cache'
        errors << HealthCheck::Utils.check_cache
      when 'resque-redis-if-present'
        errors << HealthCheck::ResqueHealthCheck.check if defined?(::Resque)
      when 'sidekiq-redis-if-present'
        errors << HealthCheck::SidekiqHealthCheck.check if defined?(::Sidekiq)
      when 'redis-if-present'
        errors << HealthCheck::RedisHealthCheck.check if defined?(::Redis)
      when 's3-if-present'
        errors << HealthCheck::S3HealthCheck.check if defined?(::Aws)
      when 'resque-redis'
        errors << HealthCheck::ResqueHealthCheck.check
      when 'sidekiq-redis'
        errors << HealthCheck::SidekiqHealthCheck.check
      when 'redis'
        errors << HealthCheck::RedisHealthCheck.check
      when 's3'
        errors << HealthCheck::S3HealthCheck.check
      when "standard"
        errors << HealthCheck::Utils.process_checks(HealthCheck.standard_checks, called_from_middleware)
      when "middleware"
        errors << "Health check not called from middleware - probably not installed as middleware." unless called_from_middleware
      when "custom"
        HealthCheck.custom_checks.each do |custom_check|
          errors << custom_check.call(self)
        end
      when "all", "full"
        errors << HealthCheck::Utils.process_checks(HealthCheck.full_checks, called_from_middleware)
      else
        return "invalid argument to health_test."
    end
  end
  return errors
rescue => e
  return e.message
end