Class: Cosmos::ProcessManager

Inherits:
Object
  • Object
show all
Defined in:
lib/cosmos/utilities/process_manager.rb

Overview

Spawns short lived processes and ensures they complete

Constant Summary collapse

MONITOR_CYCLE_SECONDS = 
10
CLEANUP_CYCLE_SECONDS = 
600
@@instance = 
nil

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ProcessManager

Returns a new instance of ProcessManager.



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# File 'lib/cosmos/utilities/process_manager.rb', line 62

def initialize
  @processes = []
  @monitor_thread = Thread.new do
    begin
      monitor()
    rescue => err
      raise "ProcessManager unexpectedly died\n#{err.formatted}"
    end
  end
end

Class Method Details

.instance ⇒ Object 



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# File 'lib/cosmos/utilities/process_manager.rb', line 57

def self.instance
  @@instance = ProcessManager.new unless @@instance
  return @@instance
end

Instance Method Details

#monitor ⇒ Object 



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# File 'lib/cosmos/utilities/process_manager.rb', line 79

def monitor
  processes_to_delete = []
  cleanup_time = Time.now
  while true
    current_time = Time.now

    # Monitor Active Processes
    @processes.each do |process|
      # Check if the process is still alive
      if !process.alive?
        if process.exit_code != 0
          process.status.state = "Crashed"
        else
          process.status.state = "Complete"
        end
        output = process.extract_output
        process.status.output = output
        process.hard_stop
        processes_to_delete << process
      elsif process.expires_at < current_time
        process.status.state = "Expired"
        output = process.extract_output
        process.status.output = output
        process.hard_stop
        processes_to_delete << process
      end

      # Update Process Status
      process.status.update
    end
    processes_to_delete.each do |process|
      if process.status.state == "Complete"
        Logger.info "Process #{process.status.name}:#{process.process_type}:#{process.detail} completed with state #{process.status.state}"
      else
        Logger.error "Process #{process.status.name}:#{process.process_type}:#{process.detail} completed with state #{process.status.state}"
        Logger.error "Process Output:\n#{process.status.output}"
      end

      @processes.delete(process)
    end
    processes_to_delete.clear

    # Cleanup Old Process Status
    if (current_time - cleanup_time) > CLEANUP_CYCLE_SECONDS
      scopes = ScopeModel.names
      scopes.each do |scope|
        statuses = ProcessStatusModel.get_all_models(scope: scope)
        statuses.each do |status_name, status|
          if (current_time - Time.from_nsec_from_epoch(status.updated_at)) > CLEANUP_CYCLE_SECONDS
            status.destroy
          end
        end
      end
    end

    sleep(MONITOR_CYCLE_SECONDS)
  end
end

#spawn(cmd_array, process_type, detail, expires_at, **kw_args) ⇒ Object 



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# File 'lib/cosmos/utilities/process_manager.rb', line 73

def spawn(cmd_array, process_type, detail, expires_at, **kw_args)
  process = ProcessManagerProcess.new(cmd_array, process_type, detail, expires_at, **kw_args)
  process.start
  @processes << process
end