Module: Perus::Server::DB
- Defined in:
- lib/perus/server/db.rb
Constant Summary collapse
- MAX_VACUUM_ATTEMPTS =
5
- MAX_CLEAN_ATTEMPTS =
5
Class Method Summary collapse
Class Method Details
.cleanup ⇒ Object
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# File 'lib/perus/server/db.rb', line 103 def self.cleanup puts 'Cleaning old values and metrics' keep_hours = Server..keep_hours # remove old values = Time.now.to_i - (keep_hours * 60 * 60) values = Value.where("timestamp < #{}") puts "Deleting #{values.count} values" values.each(&:destroy) # remove metrics from systems if they no longer have any values empty_deleted = 0 file_deleted = 0 Metric.each do |metric| if metric.file path = metric.path if !File.exists?(path) || File.mtime(path).to_i < metric.destroy file_deleted += 1 end elsif metric.values_dataset.empty? metric.destroy empty_deleted += 1 end end puts "#{empty_deleted} metrics were deleted as they had no values" puts "#{file_deleted} metrics were deleted as they had old files" end |
.db ⇒ Object
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# File 'lib/perus/server/db.rb', line 10 def self.db @db end |
.start ⇒ Object
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# File 'lib/perus/server/db.rb', line 14 def self.start puts 'Loading database' Sequel.extension :migration Sequel.extension :inflector # connect/create the database and run any new migrations @db = Sequel.postgres('perus', host: 'localhost', username: Server..db['username'], password: Server..db['password']) Sequel::Migrator.run(@db, File.join(__dir__, 'migrations')) # load models - these rely on an existing db connection Dir.chdir(File.join(__dir__, 'models')) do require './system' require './config' require './value' require './group' require './error' require './alert' require './action' require './metric' require './script' require './command_config' require './script_command' require './config_metric' require './active_alert' end end |
.start_timers ⇒ Object
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# File 'lib/perus/server/db.rb', line 41 def self.start_timers # a fixed number of hours of data are kept in the database. once an # hour, old values and files are removed. if all values of a metric # are removed from a system, the accompanying metric record is also # removed. cleanup_task = Concurrent::TimerTask.new do attempts = 0 complete = false while !complete && attempts < MAX_CLEAN_ATTEMPTS begin puts "Cleaning, attempt #{attempts + 1}" start = Time.now Perus::Server::DB.cleanup Stats.cleaned!(Time.now - start) start = Time.now @db.execute('vacuum') Stats.vacuumed!(Time.now - start) complete = true puts "Cleaning complete" rescue attempts += 1 if attempts < MAX_CLEAN_ATTEMPTS puts "Clean failed, will reattempt after short sleep" sleep(5) end end end if !complete puts "Clean failed more than MAX_CLEAN_ATTEMPTS" Stats.cleaned!('failed') end end # fire every hour cleanup_task.execution_interval = 60 * 60 cleanup_task.execute # alerts can be process intensive, so to keep page refreshes # responsive the 'active' state of an alert for each system is # cached so lookups can be done against the db, rather than running # each alert for each system on a page load. cache_alerts_task = Concurrent::TimerTask.new do if Server.ping_queue.empty? begin start = Time.now Perus::Server::Alert.cache_active_alerts Stats.alerts_cached!(Time.now - start) rescue Stats.alerts_cached!('failed') end end end cache_alerts_task.execution_interval = Server..cache_alerts_secs cache_alerts_task.execute end |