Class: Vmpooler::PoolManager

Inherits:
Object
  • Object
show all
Defined in:
lib/vmpooler/pool_manager.rb,
lib/vmpooler/providers/base.rb,
lib/vmpooler/providers/dummy.rb,
lib/vmpooler/generic_connection_pool.rb

Defined Under Namespace

Classes: GenericConnectionPool, Provider

Constant Summary collapse

CHECK_LOOP_DELAY_MIN_DEFAULT = 
5
CHECK_LOOP_DELAY_MAX_DEFAULT = 
60
CHECK_LOOP_DELAY_DECAY_DEFAULT = 
2.0

Instance Method Summary collapse

Constructor Details

#initialize(config, logger, redis_connection_pool, metrics) ⇒ PoolManager 



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# File 'lib/vmpooler/pool_manager.rb', line 14

def initialize(config, logger, redis_connection_pool, metrics)
  $config = config

  # Load logger library
  $logger = logger

  # metrics logging handle
  $metrics = metrics

  # Redis connection pool
  @redis = redis_connection_pool

  # VM Provider objects
  $providers = Concurrent::Hash.new

  # Our thread-tracker object
  $threads = Concurrent::Hash.new

  # Pool mutex
  @reconfigure_pool = Concurrent::Hash.new

  @vm_mutex = Concurrent::Hash.new

  # Name generator for generating host names
  @name_generator = Spicy::Proton.new

  # load specified providers from config file
  load_used_providers
end

Instance Method Details

#_check_disk_queue ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 679

def _check_disk_queue
  @redis.with_metrics do |redis|
    task_detail = redis.spop('vmpooler__tasks__disk')
    unless task_detail.nil?
      begin
        vm_name, disk_size = task_detail.split(':')
        pool_name = get_pool_name_for_vm(vm_name, redis)
        raise("Unable to determine which pool #{vm_name} is a member of") if pool_name.nil?

        provider = get_provider_for_pool(pool_name)
        raise("Missing Provider for vm #{vm_name} in pool #{pool_name}") if provider.nil?

        create_vm_disk(pool_name, vm_name, disk_size, provider)
      rescue StandardError => e
        $logger.log('s', "[!] [disk_manager] disk creation appears to have failed: #{e}")
      end
    end
  end
end

#_check_ondemand_requests(maxloop = 0, loop_delay_min = CHECK_LOOP_DELAY_MIN_DEFAULT, loop_delay_max = CHECK_LOOP_DELAY_MAX_DEFAULT, loop_delay_decay = CHECK_LOOP_DELAY_DECAY_DEFAULT) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1384

def _check_ondemand_requests(maxloop = 0,
                             loop_delay_min = CHECK_LOOP_DELAY_MIN_DEFAULT,
                             loop_delay_max = CHECK_LOOP_DELAY_MAX_DEFAULT,
                             loop_delay_decay = CHECK_LOOP_DELAY_DECAY_DEFAULT)

  loop_delay_min = $config[:config]['check_loop_delay_min'] unless $config[:config]['check_loop_delay_min'].nil?
  loop_delay_max = $config[:config]['check_loop_delay_max'] unless $config[:config]['check_loop_delay_max'].nil?
  loop_delay_decay = $config[:config]['check_loop_delay_decay'] unless $config[:config]['check_loop_delay_decay'].nil?

  loop_delay_decay = 2.0 if loop_delay_decay <= 1.0
  loop_delay_max = loop_delay_min if loop_delay_max.nil? || loop_delay_max < loop_delay_min

  loop_count = 1
  loop_delay = loop_delay_min

  loop do
    result = process_ondemand_requests

    loop_delay = (loop_delay * loop_delay_decay).to_i
    loop_delay = loop_delay_min if result > 0
    loop_delay = loop_delay_max if loop_delay > loop_delay_max
    sleep_with_wakeup_events(loop_delay, loop_delay_min, ondemand_request: true)

    unless maxloop == 0
      break if loop_count >= maxloop

      loop_count += 1
    end
  end
end

#_check_pending_vm(vm, pool, timeout, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 90

def _check_pending_vm(vm, pool, timeout, provider)
  mutex = vm_mutex(vm)
  return if mutex.locked?

  mutex.synchronize do
    @redis.with_metrics do |redis|
      request_id = redis.hget("vmpooler__vm__#{vm}", 'request_id')
      if provider.vm_ready?(pool, vm)
        move_pending_vm_to_ready(vm, pool, redis, request_id)
      else
        fail_pending_vm(vm, pool, timeout, redis)
      end
    end
  end
end

#_check_pool(pool, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1297

def _check_pool(pool, provider)
  pool_check_response = {
    discovered_vms: 0,
    checked_running_vms: 0,
    checked_ready_vms: 0,
    checked_pending_vms: 0,
    destroyed_vms: 0,
    migrated_vms: 0,
    cloned_vms: 0
  }

  begin
    inventory = create_inventory(pool, provider, pool_check_response)
  rescue StandardError
    return(pool_check_response)
  end

  check_running_pool_vms(pool['name'], provider, pool_check_response, inventory)

  check_ready_pool_vms(pool['name'], provider, pool_check_response, inventory, pool['ready_ttl'] || $config[:config]['ready_ttl'])

  check_pending_pool_vms(pool['name'], provider, pool_check_response, inventory, pool['timeout'])

  check_completed_pool_vms(pool['name'], provider, pool_check_response, inventory)

  check_discovered_pool_vms(pool['name'])

  check_migrating_pool_vms(pool['name'], provider, pool_check_response, inventory)

  # UPDATE TEMPLATE
  # Evaluates a pool template to ensure templates are prepared adequately for the configured provider
  # If a pool template configuration change is detected then template preparation is repeated for the new template
  # Additionally, a pool will drain ready and pending instances
  evaluate_template(pool, provider)

  # Check to see if a pool size change has been made via the configuration API
  # Since check_pool runs in a loop it does not
  # otherwise identify this change when running
  update_pool_size(pool)

  # Check to see if a pool size change has been made via the configuration API
  # Additionally, a pool will drain ready and pending instances
  update_clone_target(pool)

  repopulate_pool_vms(pool['name'], provider, pool_check_response, pool['size'])

  # Remove VMs in excess of the configured pool size
  remove_excess_vms(pool)

  # Reset a pool when poolreset is requested from the API
  reset_pool(pool)

  # Undo overrides submitted via the api
  undo_override(pool, provider)

  pool_check_response
end

#_check_ready_vm(vm, pool_name, ttl, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 200

def _check_ready_vm(vm, pool_name, ttl, provider)
  # Periodically check that the VM is available
  mutex = vm_mutex(vm)
  return if mutex.locked?

  mutex.synchronize do
    @redis.with_metrics do |redis|
      check_stamp = redis.hget("vmpooler__vm__#{vm}", 'check')
      last_checked_too_soon = ((Time.now - Time.parse(check_stamp)).to_i < $config[:config]['vm_checktime'] * 60) if check_stamp
      break if check_stamp && last_checked_too_soon

      redis.hset("vmpooler__vm__#{vm}", 'check', Time.now)
      # Check if the hosts TTL has expired
      # if 'boottime' is nil, set bootime to beginning of unix epoch, forces TTL to be assumed expired
      boottime = redis.hget("vmpooler__vm__#{vm}", 'ready')
      if boottime
        boottime = Time.parse(boottime)
      else
        boottime = Time.at(0)
      end
      if (Time.now - boottime).to_i > ttl * 60
        redis.smove("vmpooler__ready__#{pool_name}", "vmpooler__completed__#{pool_name}", vm)

        $logger.log('d', "[!] [#{pool_name}] '#{vm}' reached end of TTL after #{ttl} minutes, removed from 'ready' queue")
        return nil
      end

      break if mismatched_hostname?(vm, pool_name, provider, redis)

      vm_still_ready?(pool_name, vm, provider, redis)
    end
  end
end

#_check_running_vm(vm, pool, ttl, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 276

def _check_running_vm(vm, pool, ttl, provider)
  mutex = vm_mutex(vm)
  return if mutex.locked?

  mutex.synchronize do
    catch :stop_checking do
      @redis.with_metrics do |redis|
        # Check that VM is within defined lifetime
        checkouttime = redis.hget("vmpooler__active__#{pool}", vm)
        if checkouttime
          time_since_checkout = Time.now - Time.parse(checkouttime)
          running = time_since_checkout / 60 / 60

          if (ttl.to_i > 0) && (running.to_i >= ttl.to_i)
            move_vm_queue(pool, vm, 'running', 'completed', redis, "reached end of TTL after #{ttl} hours")
            throw :stop_checking
          end
        else
          move_vm_queue(pool, vm, 'running', 'completed', redis, 'is listed as running, but has no checkouttime data. Removing from running')
        end

        # tag VM if not tagged yet, this ensures the method is only called once
        unless redis.hget("vmpooler__vm__#{vm}", 'user_tagged')
          success = provider.tag_vm_user(pool, vm)
          redis.hset("vmpooler__vm__#{vm}", 'user_tagged', 'true') if success
        end

        throw :stop_checking if provider.vm_ready?(pool, vm)

        throw :stop_checking if provider.get_vm(pool, vm)

        move_vm_queue(pool, vm, 'running', 'completed', redis, 'is no longer in inventory, removing from running')
      end
    end
  end
end

#_check_snapshot_queue ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 717

def _check_snapshot_queue
  @redis.with_metrics do |redis|
    task_detail = redis.spop('vmpooler__tasks__snapshot')

    unless task_detail.nil?
      begin
        vm_name, snapshot_name = task_detail.split(':')
        pool_name = get_pool_name_for_vm(vm_name, redis)
        raise("Unable to determine which pool #{vm_name} is a member of") if pool_name.nil?

        provider = get_provider_for_pool(pool_name)
        raise("Missing Provider for vm #{vm_name} in pool #{pool_name}") if provider.nil?

        create_vm_snapshot(pool_name, vm_name, snapshot_name, provider)
      rescue StandardError => e
        $logger.log('s', "[!] [snapshot_manager] snapshot create appears to have failed: #{e}")
      end
    end

    task_detail = redis.spop('vmpooler__tasks__snapshot-revert')

    unless task_detail.nil?
      begin
        vm_name, snapshot_name = task_detail.split(':')
        pool_name = get_pool_name_for_vm(vm_name, redis)
        raise("Unable to determine which pool #{vm_name} is a member of") if pool_name.nil?

        provider = get_provider_for_pool(pool_name)
        raise("Missing Provider for vm #{vm_name} in pool #{pool_name}") if provider.nil?

        revert_vm_snapshot(pool_name, vm_name, snapshot_name, provider)
      rescue StandardError => e
        $logger.log('s', "[!] [snapshot_manager] snapshot revert appears to have failed: #{e}")
      end
    end
  end
end

#_clone_vm(pool_name, provider, request_id = nil, pool_alias = nil) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 398

def _clone_vm(pool_name, provider, request_id = nil, pool_alias = nil)
  new_vmname = find_unique_hostname(pool_name)
  mutex = vm_mutex(new_vmname)
  mutex.synchronize do
    @redis.with_metrics do |redis|
      # Add VM to Redis inventory ('pending' pool)
      redis.multi
      redis.sadd("vmpooler__pending__#{pool_name}", new_vmname)
      redis.hset("vmpooler__vm__#{new_vmname}", 'clone', Time.now)
      redis.hset("vmpooler__vm__#{new_vmname}", 'template', pool_name) # This value is used to represent the pool.
      redis.hset("vmpooler__vm__#{new_vmname}", 'pool', pool_name)
      redis.hset("vmpooler__vm__#{new_vmname}", 'request_id', request_id) if request_id
      redis.hset("vmpooler__vm__#{new_vmname}", 'pool_alias', pool_alias) if pool_alias
      redis.exec
    end

    begin
      $logger.log('d', "[ ] [#{pool_name}] Starting to clone '#{new_vmname}'")
      start = Time.now
      provider.create_vm(pool_name, new_vmname)
      finish = format('%<time>.2f', time: Time.now - start)

      @redis.with_metrics do |redis|
        redis.pipelined do
          redis.hset("vmpooler__clone__#{Date.today}", "#{pool_name}:#{new_vmname}", finish)
          redis.hset("vmpooler__vm__#{new_vmname}", 'clone_time', finish)
        end
      end
      $logger.log('s', "[+] [#{pool_name}] '#{new_vmname}' cloned in #{finish} seconds")

      $metrics.timing("clone.#{pool_name}", finish)
    rescue StandardError
      @redis.with_metrics do |redis|
        redis.pipelined do
          redis.srem("vmpooler__pending__#{pool_name}", new_vmname)
          expiration_ttl = $config[:redis]['data_ttl'].to_i * 60 * 60
          redis.expire("vmpooler__vm__#{new_vmname}", expiration_ttl)
        end
      end
      raise
    ensure
      @redis.with_metrics do |redis|
        redis.decr('vmpooler__tasks__ondemandclone') if request_id
        redis.decr('vmpooler__tasks__clone') unless request_id
      end
    end
  end
end

#_create_vm_disk(pool_name, vm_name, disk_size, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 528

def _create_vm_disk(pool_name, vm_name, disk_size, provider)
  raise("Invalid disk size of '#{disk_size}' passed") if disk_size.nil? || disk_size.empty? || disk_size.to_i <= 0

  $logger.log('s', "[ ] [disk_manager] '#{vm_name}' is attaching a #{disk_size}gb disk")

  start = Time.now

  result = provider.create_disk(pool_name, vm_name, disk_size.to_i)

  finish = format('%<time>.2f', time: Time.now - start)

  if result
    @redis.with_metrics do |redis|
      rdisks = redis.hget("vmpooler__vm__#{vm_name}", 'disk')
      disks = rdisks ? rdisks.split(':') : []
      disks.push("+#{disk_size}gb")
      redis.hset("vmpooler__vm__#{vm_name}", 'disk', disks.join(':'))
    end

    $logger.log('s', "[+] [disk_manager] '#{vm_name}' attached #{disk_size}gb disk in #{finish} seconds")
  else
    $logger.log('s', "[+] [disk_manager] '#{vm_name}' failed to attach disk")
  end

  result
end

#_create_vm_snapshot(pool_name, vm_name, snapshot_name, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 566

def _create_vm_snapshot(pool_name, vm_name, snapshot_name, provider)
  $logger.log('s', "[ ] [snapshot_manager] 'Attempting to snapshot #{vm_name} in pool #{pool_name}")
  start = Time.now

  result = provider.create_snapshot(pool_name, vm_name, snapshot_name)

  finish = format('%<time>.2f', time: Time.now - start)

  if result
    @redis.with_metrics do |redis|
      redis.hset("vmpooler__vm__#{vm_name}", "snapshot:#{snapshot_name}", Time.now.to_s)
    end
    $logger.log('s', "[+] [snapshot_manager] '#{vm_name}' snapshot created in #{finish} seconds")
  else
    $logger.log('s', "[+] [snapshot_manager] Failed to snapshot '#{vm_name}'")
  end

  result
end

#_destroy_vm(vm, pool, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 459

def _destroy_vm(vm, pool, provider)
  mutex = vm_mutex(vm)
  return if mutex.locked?

  mutex.synchronize do
    @redis.with_metrics do |redis|
      redis.pipelined do
        redis.hdel("vmpooler__active__#{pool}", vm)
        redis.hset("vmpooler__vm__#{vm}", 'destroy', Time.now)

        # Auto-expire metadata key
        redis.expire("vmpooler__vm__#{vm}", ($config[:redis]['data_ttl'].to_i * 60 * 60))
      end

      start = Time.now

      provider.destroy_vm(pool, vm)

      redis.srem("vmpooler__completed__#{pool}", vm)

      finish = format('%<time>.2f', time: Time.now - start)
      $logger.log('s', "[-] [#{pool}] '#{vm}' destroyed in #{finish} seconds")
      $metrics.timing("destroy.#{pool}", finish)
    end
  end
  dereference_mutex(vm)
end

#_revert_vm_snapshot(pool_name, vm_name, snapshot_name, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 597

def _revert_vm_snapshot(pool_name, vm_name, snapshot_name, provider)
  $logger.log('s', "[ ] [snapshot_manager] 'Attempting to revert #{vm_name}' in pool #{pool_name} to snapshot '#{snapshot_name}'")
  start = Time.now

  result = provider.revert_snapshot(pool_name, vm_name, snapshot_name)

  finish = format('%<time>.2f', time: Time.now - start)

  if result
    $logger.log('s', "[+] [snapshot_manager] '#{vm_name}' reverted to snapshot '#{snapshot_name}' in #{finish} seconds")
  else
    $logger.log('s', "[+] [snapshot_manager] Failed to revert #{vm_name}' in pool #{pool_name} to snapshot '#{snapshot_name}'")
  end

  result
end

#check_completed_pool_vms(pool_name, provider, pool_check_response, inventory) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1199

def check_completed_pool_vms(pool_name, provider, pool_check_response, inventory)
  @redis.with_metrics do |redis|
    redis.smembers("vmpooler__completed__#{pool_name}").each do |vm|
      if inventory[vm]
        begin
          pool_check_response[:destroyed_vms] += 1
          destroy_vm(vm, pool_name, provider)
        rescue StandardError => e
          redis.pipelined do
            redis.srem("vmpooler__completed__#{pool_name}", vm)
            redis.hdel("vmpooler__active__#{pool_name}", vm)
            redis.del("vmpooler__vm__#{vm}")
          end
          $logger.log('d', "[!] [#{pool_name}] _check_pool failed with an error while evaluating completed VMs: #{e}")
        end
      else
        $logger.log('s', "[!] [#{pool_name}] '#{vm}' not found in inventory, removed from 'completed' queue")
        redis.pipelined do
          redis.srem("vmpooler__completed__#{pool_name}", vm)
          redis.hdel("vmpooler__active__#{pool_name}", vm)
          redis.del("vmpooler__vm__#{vm}")
        end
      end
    end
  end
end

#check_discovered_pool_vms(pool_name) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1226

def check_discovered_pool_vms(pool_name)
  @redis.with_metrics do |redis|
    redis.smembers("vmpooler__discovered__#{pool_name}").reverse.each do |vm|
      %w[pending ready running completed].each do |queue|
        if redis.sismember("vmpooler__#{queue}__#{pool_name}", vm)
          $logger.log('d', "[!] [#{pool_name}] '#{vm}' found in '#{queue}', removed from 'discovered' queue")
          redis.srem("vmpooler__discovered__#{pool_name}", vm)
        end
      end

      redis.smove("vmpooler__discovered__#{pool_name}", "vmpooler__completed__#{pool_name}", vm) if redis.sismember("vmpooler__discovered__#{pool_name}", vm)
    end
  end
rescue StandardError => e
  $logger.log('d', "[!] [#{pool_name}] _check_pool failed with an error while evaluating discovered VMs: #{e}")
end

#check_disk_queue(maxloop = 0, loop_delay = 5) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 661

def check_disk_queue(maxloop = 0, loop_delay = 5)
  $logger.log('d', '[*] [disk_manager] starting worker thread')

  $threads['disk_manager'] = Thread.new do
    loop_count = 1
    loop do
      _check_disk_queue
      sleep(loop_delay)

      unless maxloop == 0
        break if loop_count >= maxloop

        loop_count += 1
      end
    end
  end
end

#check_dns_available(vm_name, domain = nil) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 384

def check_dns_available(vm_name, domain = nil)
  # Query the DNS for the name we want to create and if it already exists, mark it unavailable
  # This protects against stale DNS records
  vm_name = "#{vm_name}.#{domain}" if domain
  begin
    dns_ip = Resolv.getaddress(vm_name)
  rescue Resolv::ResolvError
    # this is the expected case, swallow the error
    # eg "no address for blah-daisy"
    return ['', true]
  end
  [dns_ip, false]
end

#check_migrating_pool_vms(pool_name, provider, pool_check_response, inventory) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1243

def check_migrating_pool_vms(pool_name, provider, pool_check_response, inventory)
  @redis.with_metrics do |redis|
    redis.smembers("vmpooler__migrating__#{pool_name}").reverse.each do |vm|
      if inventory[vm]
        begin
          pool_check_response[:migrated_vms] += 1
          migrate_vm(vm, pool_name, provider)
        rescue StandardError => e
          $logger.log('s', "[x] [#{pool_name}] '#{vm}' failed to migrate: #{e}")
        end
      end
    end
  end
end

#check_ondemand_request_ready(request_id, redis, score = nil) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1499

def check_ondemand_request_ready(request_id, redis, score = nil)
  # default expiration is one month to ensure the data does not stay in redis forever
  default_expiration = 259_200_0
  processing_key = 'vmpooler__provisioning__processing'
  ondemand_hash_key = "vmpooler__odrequest__#{request_id}"
  score ||= redis.zscore(processing_key, request_id)
  return if request_expired?(request_id, score, redis)

  return unless vms_ready?(request_id, redis)

  redis.multi
  redis.hset(ondemand_hash_key, 'status', 'ready')
  redis.expire(ondemand_hash_key, default_expiration)
  redis.zrem(processing_key, request_id)
  redis.exec
end

#check_ondemand_requests(maxloop = 0, loop_delay_min = CHECK_LOOP_DELAY_MIN_DEFAULT, loop_delay_max = CHECK_LOOP_DELAY_MAX_DEFAULT, loop_delay_decay = CHECK_LOOP_DELAY_DECAY_DEFAULT) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1372

def check_ondemand_requests(maxloop = 0,
                            loop_delay_min = CHECK_LOOP_DELAY_MIN_DEFAULT,
                            loop_delay_max = CHECK_LOOP_DELAY_MAX_DEFAULT,
                            loop_delay_decay = CHECK_LOOP_DELAY_DECAY_DEFAULT)

  $logger.log('d', '[*] [ondemand_provisioner] starting worker thread')

  $threads['ondemand_provisioner'] = Thread.new do
    _check_ondemand_requests(maxloop, loop_delay_min, loop_delay_max, loop_delay_decay)
  end
end

#check_ondemand_requests_ready(redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1491

def check_ondemand_requests_ready(redis)
  in_progress_requests = redis.zrange('vmpooler__provisioning__processing', 0, -1, with_scores: true)
  in_progress_requests&.each do |request_id, score|
    check_ondemand_request_ready(request_id, redis, score)
  end
  in_progress_requests.length
end

#check_pending_pool_vms(pool_name, provider, pool_check_response, inventory, pool_timeout) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1181

def check_pending_pool_vms(pool_name, provider, pool_check_response, inventory, pool_timeout)
  pool_timeout ||= $config[:config]['timeout'] || 15
  @redis.with_metrics do |redis|
    redis.smembers("vmpooler__pending__#{pool_name}").reverse.each do |vm|
      if inventory[vm]
        begin
          pool_check_response[:checked_pending_vms] += 1
          check_pending_vm(vm, pool_name, pool_timeout, provider)
        rescue StandardError => e
          $logger.log('d', "[!] [#{pool_name}] _check_pool failed with an error while evaluating pending VMs: #{e}")
        end
      else
        fail_pending_vm(vm, pool_name, pool_timeout, redis, exists: false)
      end
    end
  end
end

#check_pending_vm(vm, pool, timeout, provider) ⇒ Object

Check the state of a VM



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# File 'lib/vmpooler/pool_manager.rb', line 76

def check_pending_vm(vm, pool, timeout, provider)
  Thread.new do
    begin
      _check_pending_vm(vm, pool, timeout, provider)
    rescue StandardError => e
      $logger.log('s', "[!] [#{pool}] '#{vm}' #{timeout} #{provider} errored while checking a pending vm : #{e}")
      @redis.with_metrics do |redis|
        fail_pending_vm(vm, pool, timeout, redis)
      end
      raise
    end
  end
end

#check_pool(pool, maxloop = 0, loop_delay_min = CHECK_LOOP_DELAY_MIN_DEFAULT, loop_delay_max = CHECK_LOOP_DELAY_MAX_DEFAULT, loop_delay_decay = CHECK_LOOP_DELAY_DECAY_DEFAULT) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 862

def check_pool(pool,
               maxloop = 0,
               loop_delay_min = CHECK_LOOP_DELAY_MIN_DEFAULT,
               loop_delay_max = CHECK_LOOP_DELAY_MAX_DEFAULT,
               loop_delay_decay = CHECK_LOOP_DELAY_DECAY_DEFAULT)
  $logger.log('d', "[*] [#{pool['name']}] starting worker thread")

  # Use the pool setings if they exist
  loop_delay_min = pool['check_loop_delay_min'] unless pool['check_loop_delay_min'].nil?
  loop_delay_max = pool['check_loop_delay_max'] unless pool['check_loop_delay_max'].nil?
  loop_delay_decay = pool['check_loop_delay_decay'] unless pool['check_loop_delay_decay'].nil?

  loop_delay_decay = 2.0 if loop_delay_decay <= 1.0
  loop_delay_max = loop_delay_min if loop_delay_max.nil? || loop_delay_max < loop_delay_min

  $threads[pool['name']] = Thread.new do
    begin
      loop_count = 1
      loop_delay = loop_delay_min
      provider = get_provider_for_pool(pool['name'])
      raise("Could not find provider '#{pool['provider']}") if provider.nil?

      sync_pool_template(pool)
      loop do
        result = _check_pool(pool, provider)

        if result[:cloned_vms] > 0 || result[:checked_pending_vms] > 0 || result[:discovered_vms] > 0
          loop_delay = loop_delay_min
        else
          loop_delay = (loop_delay * loop_delay_decay).to_i
          loop_delay = loop_delay_max if loop_delay > loop_delay_max
        end
        sleep_with_wakeup_events(loop_delay, loop_delay_min, pool_size_change: true, poolname: pool['name'], pool_template_change: true, clone_target_change: true, pending_vm: true, pool_reset: true, undo_override: true)

        unless maxloop == 0
          break if loop_count >= maxloop

          loop_count += 1
        end
      end
    rescue Redis::CannotConnectError
      raise
    rescue StandardError => e
      $logger.log('s', "[!] [#{pool['name']}] Error while checking the pool: #{e}")
      raise
    end
  end
end

#check_ready_pool_vms(pool_name, provider, pool_check_response, inventory, pool_ttl) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1164

def check_ready_pool_vms(pool_name, provider, pool_check_response, inventory, pool_ttl)
  @redis.with_metrics do |redis|
    redis.smembers("vmpooler__ready__#{pool_name}").each do |vm|
      if inventory[vm]
        begin
          pool_check_response[:checked_ready_vms] += 1
          check_ready_vm(vm, pool_name, pool_ttl, provider)
        rescue StandardError => e
          $logger.log('d', "[!] [#{pool_name}] _check_pool failed with an error while evaluating ready VMs: #{e}")
        end
      else
        move_vm_queue(pool_name, vm, 'ready', 'completed', redis, 'is a ready VM but is missing from inventory.  Marking as completed.')
      end
    end
  end
end

#check_ready_vm(vm, pool_name, ttl, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 189

def check_ready_vm(vm, pool_name, ttl, provider)
  Thread.new do
    begin
      _check_ready_vm(vm, pool_name, ttl, provider)
    rescue StandardError => e
      $logger.log('s', "[!] [#{pool_name}] '#{vm}' failed while checking a ready vm : #{e}")
      raise
    end
  end
end

#check_running_pool_vms(pool_name, provider, pool_check_response, inventory) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1146

def check_running_pool_vms(pool_name, provider, pool_check_response, inventory)
  @redis.with_metrics do |redis|
    redis.smembers("vmpooler__running__#{pool_name}").each do |vm|
      if inventory[vm]
        begin
          vm_lifetime = redis.hget("vmpooler__vm__#{vm}", 'lifetime') || $config[:config]['vm_lifetime'] || 12
          pool_check_response[:checked_running_vms] += 1
          check_running_vm(vm, pool_name, vm_lifetime, provider)
        rescue StandardError => e
          $logger.log('d', "[!] [#{pool_name}] _check_pool with an error while evaluating running VMs: #{e}")
        end
      else
        move_vm_queue(pool_name, vm, 'running', 'completed', redis, 'is a running VM but is missing from inventory.  Marking as completed.')
      end
    end
  end
end

#check_running_vm(vm, pool, ttl, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 265

def check_running_vm(vm, pool, ttl, provider)
  Thread.new do
    begin
      _check_running_vm(vm, pool, ttl, provider)
    rescue StandardError => e
      $logger.log('s', "[!] [#{pool}] '#{vm}' failed while checking VM with an error: #{e}")
      raise
    end
  end
end

#check_snapshot_queue(maxloop = 0, loop_delay = 5) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 699

def check_snapshot_queue(maxloop = 0, loop_delay = 5)
  $logger.log('d', '[*] [snapshot_manager] starting worker thread')

  $threads['snapshot_manager'] = Thread.new do
    loop_count = 1
    loop do
      _check_snapshot_queue
      sleep(loop_delay)

      unless maxloop == 0
        break if loop_count >= maxloop

        loop_count += 1
      end
    end
  end
end

#clone_vm(pool_name, provider, request_id = nil, pool_alias = nil) ⇒ Object

Clone a VM



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# File 'lib/vmpooler/pool_manager.rb', line 319

def clone_vm(pool_name, provider, request_id = nil, pool_alias = nil)
  Thread.new do
    begin
      _clone_vm(pool_name, provider, request_id, pool_alias)
    rescue StandardError => e
      if request_id
        $logger.log('s', "[!] [#{pool_name}] failed while cloning VM for request #{request_id} with an error: #{e}")
        @redis.with_metrics do |redis|
          redis.zadd('vmpooler__odcreate__task', 1, "#{pool_alias}:#{pool_name}:1:#{request_id}")
        end
      else
        $logger.log('s', "[!] [#{pool_name}] failed while cloning VM with an error: #{e}")
      end
      raise
    end
  end
end

#config ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 44

def config
  $config
end

#create_inventory(pool, provider, pool_check_response) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1115

def create_inventory(pool, provider, pool_check_response)
  inventory = {}
  begin
    mutex = pool_mutex(pool['name'])
    mutex.synchronize do
      @redis.with_metrics do |redis|
        provider.vms_in_pool(pool['name']).each do |vm|
          if !redis.sismember("vmpooler__running__#{pool['name']}", vm['name']) &&
             !redis.sismember("vmpooler__ready__#{pool['name']}", vm['name']) &&
             !redis.sismember("vmpooler__pending__#{pool['name']}", vm['name']) &&
             !redis.sismember("vmpooler__completed__#{pool['name']}", vm['name']) &&
             !redis.sismember("vmpooler__discovered__#{pool['name']}", vm['name']) &&
             !redis.sismember("vmpooler__migrating__#{pool['name']}", vm['name'])

            pool_check_response[:discovered_vms] += 1
            redis.sadd("vmpooler__discovered__#{pool['name']}", vm['name'])

            $logger.log('s', "[?] [#{pool['name']}] '#{vm['name']}' added to 'discovered' queue")
          end

          inventory[vm['name']] = 1
        end
      end
    end
  rescue StandardError => e
    $logger.log('s', "[!] [#{pool['name']}] _check_pool failed with an error while running create_inventory: #{e}")
    raise(e)
  end
  inventory
end

#create_ondemand_vms(request_id, redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1425

def create_ondemand_vms(request_id, redis)
  requested = redis.hget("vmpooler__odrequest__#{request_id}", 'requested')
  unless requested
    $logger.log('s', "Failed to find odrequest for request_id '#{request_id}'")
    redis.zrem('vmpooler__provisioning__request', request_id)
    return
  end
  score = redis.zscore('vmpooler__provisioning__request', request_id)
  requested = requested.split(',')

  redis.pipelined do
    requested.each do |request|
      redis.zadd('vmpooler__odcreate__task', Time.now.to_i, "#{request}:#{request_id}")
    end
    redis.zrem('vmpooler__provisioning__request', request_id)
    redis.zadd('vmpooler__provisioning__processing', score, request_id)
  end
end

#create_provider_object(config, logger, metrics, redis_connection_pool, provider_class, provider_name, options) ⇒ Object

Create a provider object, usually based on the providers/*.rb class, that implements providers/base.rb provider_class: Needs to match a class in the Vmpooler::PoolManager::Provider namespace. This is

either as a gem in the LOADPATH or in providers/*.rb ie Vmpooler::PoolManager::Provider::X

provider_name: Should be a unique provider name

returns an object Vmpooler::PoolManager::Provider::* or raises an error if the class does not exist



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# File 'lib/vmpooler/pool_manager.rb', line 1362

def create_provider_object(config, logger, metrics, redis_connection_pool, provider_class, provider_name, options)
  provider_klass = Vmpooler::PoolManager::Provider
  provider_klass.constants.each do |classname|
    next unless classname.to_s.casecmp(provider_class) == 0

    return provider_klass.const_get(classname).new(config, logger, metrics, redis_connection_pool, provider_name, options)
  end
  raise("Provider '#{provider_class}' is unknown for pool with provider name '#{provider_name}'") if provider.nil?
end

#create_vm_disk(pool_name, vm, disk_size, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 517

def create_vm_disk(pool_name, vm, disk_size, provider)
  Thread.new do
    begin
      _create_vm_disk(pool_name, vm, disk_size, provider)
    rescue StandardError => e
      $logger.log('d', "[!] [#{pool_name}] '#{vm}' failed while creating disk: #{e}")
      raise
    end
  end
end

#create_vm_snapshot(pool_name, vm, snapshot_name, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 555

def create_vm_snapshot(pool_name, vm, snapshot_name, provider)
  Thread.new do
    begin
      _create_vm_snapshot(pool_name, vm, snapshot_name, provider)
    rescue StandardError => e
      $logger.log('d', "[!] [#{pool_name}] '#{vm}' failed while creating snapshot: #{e}")
      raise
    end
  end
end

#default_providers ⇒ Array

note: vsphere is the default if user does not specify although this should not be if vsphere is to no longer be loaded by default please remove



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# File 'lib/vmpooler/pool_manager.rb', line 642

def default_providers
  @default_providers ||= %w[dummy]
end

#dereference_mutex(vmname) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 919

def dereference_mutex(vmname)
  true if @vm_mutex.delete(vmname)
end

#destroy_vm(vm, pool, provider) ⇒ Object

Destroy a VM



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# File 'lib/vmpooler/pool_manager.rb', line 448

def destroy_vm(vm, pool, provider)
  Thread.new do
    begin
      _destroy_vm(vm, pool, provider)
    rescue StandardError => e
      $logger.log('d', "[!] [#{pool}] '#{vm}' failed while destroying the VM with an error: #{e}")
      raise
    end
  end
end

#drain_pool(poolname, redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 974

def drain_pool(poolname, redis)
  # Clear a pool of ready and pending instances
  if redis.scard("vmpooler__ready__#{poolname}") > 0
    $logger.log('s', "[*] [#{poolname}] removing ready instances")
    redis.smembers("vmpooler__ready__#{poolname}").each do |vm|
      move_vm_queue(poolname, vm, 'ready', 'completed', redis)
    end
  end
  if redis.scard("vmpooler__pending__#{poolname}") > 0
    $logger.log('s', "[*] [#{poolname}] removing pending instances")
    redis.smembers("vmpooler__pending__#{poolname}").each do |vm|
      move_vm_queue(poolname, vm, 'pending', 'completed', redis)
    end
  end
end

#evaluate_template(pool, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 942

def evaluate_template(pool, provider)
  mutex = pool_mutex(pool['name'])
  return if mutex.locked?

  catch :update_not_needed do
    @redis.with_metrics do |redis|
      prepared_template = redis.hget('vmpooler__template__prepared', pool['name'])
      configured_template = redis.hget('vmpooler__config__template', pool['name'])

      if prepared_template.nil?
        mutex.synchronize do
          prepare_template(pool, provider, redis)
          prepared_template = redis.hget('vmpooler__template__prepared', pool['name'])
        end
      elsif prepared_template != pool['template']
        if configured_template.nil?
          mutex.synchronize do
            prepare_template(pool, provider, redis)
            prepared_template = redis.hget('vmpooler__template__prepared', pool['name'])
          end
        end
      end
      throw :update_not_needed if configured_template.nil?
      throw :update_not_needed if configured_template == prepared_template

      mutex.synchronize do
        update_pool_template(pool, provider, configured_template, prepared_template, redis)
      end
    end
  end
end

#execute!(maxloop = 0, loop_delay = 1) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1545

def execute!(maxloop = 0, loop_delay = 1)
  $logger.log('d', 'starting vmpooler')

  @redis.with_metrics do |redis|
    # Clear out the tasks manager, as we don't know about any tasks at this point
    redis.set('vmpooler__tasks__clone', 0)
    redis.set('vmpooler__tasks__ondemandclone', 0)
    # Clear out vmpooler__migrations since stale entries may be left after a restart
    redis.del('vmpooler__migration')
  end

  # Copy vSphere settings to correct location.  This happens with older configuration files
  if !$config[:vsphere].nil? && ($config[:providers].nil? || $config[:providers][:vsphere].nil?)
    $logger.log('d', "[!] Detected an older configuration file. Copying the settings from ':vsphere:' to ':providers:/:vsphere:'")
    $config[:providers] = {} if $config[:providers].nil?
    $config[:providers][:vsphere] = $config[:vsphere]
  end

  # Set default provider for all pools that do not have one defined
  $config[:pools].each do |pool|
    if pool['provider'].nil?
      $logger.log('d', "[!] Setting provider for pool '#{pool['name']}' to 'dummy' as default")
      pool['provider'] = 'dummy'
    end
  end

  # Load running pool configuration into redis so API server can retrieve it
  load_pools_to_redis

  # Get pool loop settings
  $config[:config] = {} if $config[:config].nil?
  check_loop_delay_min = $config[:config]['check_loop_delay_min'] || CHECK_LOOP_DELAY_MIN_DEFAULT
  check_loop_delay_max = $config[:config]['check_loop_delay_max'] || CHECK_LOOP_DELAY_MAX_DEFAULT
  check_loop_delay_decay = $config[:config]['check_loop_delay_decay'] || CHECK_LOOP_DELAY_DECAY_DEFAULT

  # Create the providers
  $config[:pools].each do |pool|
    provider_name = pool['provider']
    # The provider_class parameter can be defined in the provider's data eg
    #:providers:
    # :vsphere:
    #  provider_class: 'vsphere'
    # :another-vsphere:
    #  provider_class: 'vsphere'
    # the above would create two providers/vsphere.rb class objects named 'vsphere' and 'another-vsphere'
    # each pools would then define which provider definition to use: vsphere or another-vsphere
    #
    # if provider_class is not defined it will try to use the provider_name as the class, this is to be
    # backwards compatible for example when there is only one provider listed
    # :providers:
    #  :dummy:
    #   filename: 'db.txs'
    # the above example would create an object based on the class providers/dummy.rb
    if $config[:providers].nil? || $config[:providers][provider_name.to_sym].nil? || $config[:providers][provider_name.to_sym]['provider_class'].nil?
      provider_class = provider_name
    else
      provider_class = $config[:providers][provider_name.to_sym]['provider_class']
    end
    begin
      $providers[provider_name] = create_provider_object($config, $logger, $metrics, @redis, provider_class, provider_name, {}) if $providers[provider_name].nil?
    rescue StandardError => e
      $logger.log('s', "Error while creating provider for pool #{pool['name']}: #{e}")
      raise
    end
  end

  purge_unused_vms_and_resources

  loop_count = 1
  loop do
    if !$threads['disk_manager']
      check_disk_queue
    elsif !$threads['disk_manager'].alive?
      $logger.log('d', '[!] [disk_manager] worker thread died, restarting')
      check_disk_queue
    end

    if !$threads['snapshot_manager']
      check_snapshot_queue
    elsif !$threads['snapshot_manager'].alive?
      $logger.log('d', '[!] [snapshot_manager] worker thread died, restarting')
      check_snapshot_queue
    end

    $config[:pools].each do |pool|
      if !$threads[pool['name']]
        check_pool(pool)
      elsif !$threads[pool['name']].alive?
        $logger.log('d', "[!] [#{pool['name']}] worker thread died, restarting")
        check_pool(pool, check_loop_delay_min, check_loop_delay_max, check_loop_delay_decay)
      end
    end

    if !$threads['ondemand_provisioner']
      check_ondemand_requests
    elsif !$threads['ondemand_provisioner'].alive?
      $logger.log('d', '[!] [ondemand_provisioner] worker thread died, restarting')
      check_ondemand_requests(check_loop_delay_min, check_loop_delay_max, check_loop_delay_decay)
    end

    sleep(loop_delay)

    unless maxloop == 0
      break if loop_count >= maxloop

      loop_count += 1
    end
  end
rescue Redis::CannotConnectError => e
  $logger.log('s', "Cannot connect to the redis server: #{e}")
  raise
end

#fail_pending_vm(vm, pool, timeout, redis, exists: true) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 111

def fail_pending_vm(vm, pool, timeout, redis, exists: true)
  clone_stamp = redis.hget("vmpooler__vm__#{vm}", 'clone')

  time_since_clone = (Time.now - Time.parse(clone_stamp)) / 60
  if time_since_clone > timeout
    if exists
      request_id = redis.hget("vmpooler__vm__#{vm}", 'request_id')
      pool_alias = redis.hget("vmpooler__vm__#{vm}", 'pool_alias') if request_id
      redis.multi
      redis.smove("vmpooler__pending__#{pool}", "vmpooler__completed__#{pool}", vm)
      redis.zadd('vmpooler__odcreate__task', 1, "#{pool_alias}:#{pool}:1:#{request_id}") if request_id
      redis.exec
      $metrics.increment("errors.markedasfailed.#{pool}")
      $logger.log('d', "[!] [#{pool}] '#{vm}' marked as 'failed' after #{timeout} minutes")
    else
      remove_nonexistent_vm(vm, pool, redis)
    end
  end
  true
rescue StandardError => e
  $logger.log('d', "Fail pending VM failed with an error: #{e}")
  false
end

#find_unique_hostname(pool_name) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 357

def find_unique_hostname(pool_name)
  # generate hostname that is not already in use in vmpooler
  # also check that no dns record already exists
  hostname_retries = 0
  max_hostname_retries = 3
  while hostname_retries < max_hostname_retries
    hostname, hostname_available = generate_and_check_hostname
    domain = $config[:config]['domain']
    dns_ip, dns_available = check_dns_available(hostname, domain)
    break if hostname_available && dns_available

    hostname_retries += 1

    if !hostname_available
      $metrics.increment("errors.duplicatehostname.#{pool_name}")
      $logger.log('s', "[!] [#{pool_name}] Generated hostname #{hostname} was not unique (attempt \##{hostname_retries} of #{max_hostname_retries})")
    elsif !dns_available
      $metrics.increment("errors.staledns.#{pool_name}")
      $logger.log('s', "[!] [#{pool_name}] Generated hostname #{hostname} already exists in DNS records (#{dns_ip}), stale DNS")
    end
  end

  raise "Unable to generate a unique hostname after #{hostname_retries} attempts. The last hostname checked was #{hostname}" unless hostname_available && dns_available

  hostname
end

#generate_and_check_hostname ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 337

def generate_and_check_hostname
  # Generate a randomized hostname. The total name must no longer than 15
  # character including the hyphen. The shortest adjective in the corpus is
  # three characters long. Therefore, we can technically select a noun up to 11
  # characters long and still be guaranteed to have an available adjective.
  # Because of the limited set of 11 letter nouns and corresponding 3
  # letter adjectives, we actually limit the noun to 10 letters to avoid
  # inviting more conflicts. We favor selecting a longer noun rather than a
  # longer adjective because longer adjectives tend to be less fun.
  @redis.with do |redis|
    noun = @name_generator.noun(max: 10)
    adjective = @name_generator.adjective(max: 14 - noun.length)
    random_name = [adjective, noun].join('-')
    hostname = $config[:config]['prefix'] + random_name
    available = redis.hlen("vmpooler__vm__#{hostname}") == 0

    [hostname, available]
  end
end

#get_pool_name_for_vm(vm_name, redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 646

def get_pool_name_for_vm(vm_name, redis)
  # the 'template' is a bad name.  Should really be 'poolname'
  redis.hget("vmpooler__vm__#{vm_name}", 'template')
end

#get_provider_for_pool(pool_name) ⇒ Provider 



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# File 'lib/vmpooler/pool_manager.rb', line 653

def get_provider_for_pool(pool_name)
  pool = $config[:pools].find { |p| p['name'] == pool_name }
  return nil unless pool

  provider_name = pool.fetch('provider', nil)
  $providers[provider_name]
end

#load_pools_to_redis ⇒ Object

Place pool configuration in redis so an API instance can discover running pool configuration



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# File 'lib/vmpooler/pool_manager.rb', line 49

def load_pools_to_redis
  @redis.with_metrics do |redis|
    previously_configured_pools = redis.smembers('vmpooler__pools')
    currently_configured_pools = []
    config[:pools].each do |pool|
      currently_configured_pools << pool['name']
      redis.sadd('vmpooler__pools', pool['name'])
      pool_keys = pool.keys
      pool_keys.delete('alias')
      to_set = {}
      pool_keys.each do |k|
        to_set[k] = pool[k]
      end
      to_set['alias'] = pool['alias'].join(',') if to_set.key?('alias')
      redis.hmset("vmpooler__pool__#{pool['name']}", to_set.to_a.flatten) unless to_set.empty?
    end
    previously_configured_pools.each do |pool|
      unless currently_configured_pools.include? pool
        redis.srem('vmpooler__pools', pool)
        redis.del("vmpooler__pool__#{pool}")
      end
    end
  end
  nil
end

#load_used_providers ⇒ Object

load only providers used in config file



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# File 'lib/vmpooler/pool_manager.rb', line 615

def load_used_providers
  Vmpooler::Providers.load_by_name(used_providers)
end

#migrate_vm(vm_name, pool_name, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 755

def migrate_vm(vm_name, pool_name, provider)
  Thread.new do
    begin
      mutex = vm_mutex(vm_name)
      mutex.synchronize do
        @redis.with_metrics do |redis|
          redis.srem("vmpooler__migrating__#{pool_name}", vm_name)
        end
        provider.migrate_vm(pool_name, vm_name)
      end
    rescue StandardError => e
      $logger.log('s', "[x] [#{pool_name}] '#{vm_name}' migration failed with an error: #{e}")
    end
  end
end

#mismatched_hostname?(vm, pool_name, provider, redis) ⇒ Boolean 



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# File 'lib/vmpooler/pool_manager.rb', line 234

def mismatched_hostname?(vm, pool_name, provider, redis)
  pool_config = $config[:pools][$config[:pool_index][pool_name]]
  check_hostname = pool_config['check_hostname_for_mismatch']
  check_hostname = $config[:config]['check_ready_vm_hostname_for_mismatch'] if check_hostname.nil?
  return if check_hostname == false

  # Wait one minute before checking a VM for hostname mismatch
  # When checking as soon as the VM passes the ready test the instance
  # often doesn't report its hostname yet causing the VM to be removed immediately
  vm_ready_time = redis.hget("vmpooler__vm__#{vm}", 'ready')
  if vm_ready_time
    wait_before_checking = 60
    time_since_ready = (Time.now - Time.parse(vm_ready_time)).to_i
    return unless time_since_ready > wait_before_checking
  end

  # Check if the hostname has magically changed from underneath Pooler
  vm_hash = provider.get_vm(pool_name, vm)
  return unless vm_hash.is_a? Hash

  hostname = vm_hash['hostname']

  return if hostname.nil?
  return if hostname.empty?
  return if hostname == vm

  redis.smove("vmpooler__ready__#{pool_name}", "vmpooler__completed__#{pool_name}", vm)
  $logger.log('d', "[!] [#{pool_name}] '#{vm}' has mismatched hostname #{hostname}, removed from 'ready' queue")
  true
end

#move_pending_vm_to_ready(vm, pool, redis, request_id = nil) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 135

def move_pending_vm_to_ready(vm, pool, redis, request_id = nil)
  clone_time = redis.hget("vmpooler__vm__#{vm}", 'clone')
  finish = format('%<time>.2f', time: Time.now - Time.parse(clone_time))

  if request_id
    ondemandrequest_hash = redis.hgetall("vmpooler__odrequest__#{request_id}")
    case ondemandrequest_hash['status']
    when 'failed'
      move_vm_queue(pool, vm, 'pending', 'completed', redis, "moved to completed queue. '#{request_id}' could not be filled in time")
      return nil
    when 'deleted'
      move_vm_queue(pool, vm, 'pending', 'completed', redis, "moved to completed queue. '#{request_id}' has been deleted")
      return nil
    end
    pool_alias = redis.hget("vmpooler__vm__#{vm}", 'pool_alias')

    redis.pipelined do
      redis.hset("vmpooler__active__#{pool}", vm, Time.now)
      redis.hset("vmpooler__vm__#{vm}", 'checkout', Time.now)
      if ondemandrequest_hash['token:token']
        redis.hset("vmpooler__vm__#{vm}", 'token:token', ondemandrequest_hash['token:token'])
        redis.hset("vmpooler__vm__#{vm}", 'token:user', ondemandrequest_hash['token:user'])
        redis.hset("vmpooler__vm__#{vm}", 'lifetime', $config[:config]['vm_lifetime_auth'].to_i)
      end
      redis.sadd("vmpooler__#{request_id}__#{pool_alias}__#{pool}", vm)
    end
    move_vm_queue(pool, vm, 'pending', 'running', redis)
    check_ondemand_request_ready(request_id, redis)
  else
    redis.smove("vmpooler__pending__#{pool}", "vmpooler__ready__#{pool}", vm)
  end

  redis.pipelined do
    redis.hset("vmpooler__boot__#{Date.today}", "#{pool}:#{vm}", finish) # maybe remove as this is never used by vmpooler itself?
    redis.hset("vmpooler__vm__#{vm}", 'ready', Time.now)

    # last boot time is displayed in API, and used by alarming script
    redis.hset('vmpooler__lastboot', pool, Time.now)
  end

  $metrics.timing("time_to_ready_state.#{pool}", finish)
  $logger.log('s', "[>] [#{pool}] '#{vm}' moved from 'pending' to 'ready' queue") unless request_id
  $logger.log('s', "[>] [#{pool}] '#{vm}' is 'ready' for request '#{request_id}'") if request_id
end

#move_vm_queue(pool, vm, queue_from, queue_to, redis, msg = nil) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 313

def move_vm_queue(pool, vm, queue_from, queue_to, redis, msg = nil)
  redis.smove("vmpooler__#{queue_from}__#{pool}", "vmpooler__#{queue_to}__#{pool}", vm)
  $logger.log('d', "[!] [#{pool}] '#{vm}' #{msg}") if msg
end

#pool_mutex(poolname) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 911

def pool_mutex(poolname)
  @reconfigure_pool[poolname] || @reconfigure_pool[poolname] = Mutex.new
end

#prepare_template(pool, provider, redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 930

def prepare_template(pool, provider, redis)
  if $config[:config]['create_template_delta_disks'] && !redis.sismember('vmpooler__template__deltas', pool['template'])
    begin
      provider.create_template_delta_disks(pool)
      redis.sadd('vmpooler__template__deltas', pool['template'])
    rescue StandardError => e
      $logger.log('s', "[!] [#{pool['name']}] failed while preparing a template with an error. As a result vmpooler could not create the template delta disks. Either a template delta disk already exists, or the template delta disk creation failed. The error is: #{e}")
    end
  end
  redis.hset('vmpooler__template__prepared', pool['name'], pool['template'])
end

#process_ondemand_requests ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1415

def process_ondemand_requests
  @redis.with_metrics do |redis|
    requests = redis.zrange('vmpooler__provisioning__request', 0, -1)
    requests&.map { |request_id| create_ondemand_vms(request_id, redis) }
    provisioning_tasks = process_ondemand_vms(redis)
    requests_ready = check_ondemand_requests_ready(redis)
    requests.length + provisioning_tasks + requests_ready
  end
end

#process_ondemand_vms(redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1444

def process_ondemand_vms(redis)
  queue_key = 'vmpooler__odcreate__task'
  queue = redis.zrange(queue_key, 0, -1, with_scores: true)
  ondemand_clone_limit = $config[:config]['ondemand_clone_limit']
  queue.each do |request, score|
    clone_count = redis.get('vmpooler__tasks__ondemandclone').to_i
    break unless clone_count < ondemand_clone_limit

    pool_alias, pool, count, request_id = request.split(':')
    count = count.to_i
    provider = get_provider_for_pool(pool)
    slots = ondemand_clone_limit - clone_count
    break if slots == 0

    if slots >= count
      count.times do
        redis.incr('vmpooler__tasks__ondemandclone')
        clone_vm(pool, provider, request_id, pool_alias)
      end
      redis.zrem(queue_key, request)
    else
      remaining_count = count - slots
      slots.times do
        redis.incr('vmpooler__tasks__ondemandclone')
        clone_vm(pool, provider, request_id, pool_alias)
      end
      redis.pipelined do
        redis.zrem(queue_key, request)
        redis.zadd(queue_key, score, "#{pool_alias}:#{pool}:#{remaining_count}:#{request_id}")
      end
    end
  end
  queue.length
end

#purge_unused_vms_and_resources ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 487

def purge_unused_vms_and_resources
  global_purge = $config[:config]['purge_unconfigured_resources']
  providers = $config[:providers].keys
  providers.each do |provider_key|
    provider_purge = $config[:providers][provider_key]['purge_unconfigured_resources'] || global_purge
    if provider_purge
      Thread.new do
        begin
          purge_vms_and_resources(provider_key)
        rescue StandardError => e
          $logger.log('s', "[!] failed while purging provider #{provider_key} VMs and folders with an error: #{e}")
        end
      end
    end
  end
  nil
end

#purge_vms_and_resources(provider_name) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 505

def purge_vms_and_resources(provider_name)
  provider = $providers[provider_name.to_s]
  # Deprecated, will be removed in version 3
  if provider.provider_config['folder_whitelist']
    $logger.log('d', "[!] [deprecation] rename configuration 'folder_whitelist' to 'resources_allowlist' for provider #{provider_name}")
    allowlist = provider.provider_config['folder_whitelist']
  else
    allowlist = provider.provider_config['resources_allowlist']
  end
  provider.purge_unconfigured_resources(allowlist)
end

#remove_excess_vms(pool) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1020

def remove_excess_vms(pool)
  @redis.with_metrics do |redis|
    redis.multi
    redis.scard("vmpooler__ready__#{pool['name']}")
    redis.scard("vmpooler__pending__#{pool['name']}")
    ready, pending = redis.exec
    total = pending.to_i + ready.to_i
    break if total.nil?
    break if total == 0

    mutex = pool_mutex(pool['name'])
    break if mutex.locked?
    break unless ready.to_i > pool['size']

    mutex.synchronize do
      difference = ready.to_i - pool['size']
      difference.times do
        next_vm = redis.spop("vmpooler__ready__#{pool['name']}")
        move_vm_queue(pool['name'], next_vm, 'ready', 'completed', redis)
      end
      if total > ready
        redis.smembers("vmpooler__pending__#{pool['name']}").each do |vm|
          move_vm_queue(pool['name'], vm, 'pending', 'completed', redis)
        end
      end
    end
  end
end

#remove_nonexistent_vm(vm, pool, redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 106

def remove_nonexistent_vm(vm, pool, redis)
  redis.srem("vmpooler__pending__#{pool}", vm)
  $logger.log('d', "[!] [#{pool}] '#{vm}' no longer exists. Removing from pending.")
end

#remove_vms_for_failed_request(request_id, expiration_ttl, redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1532

def remove_vms_for_failed_request(request_id, expiration_ttl, redis)
  request_hash = redis.hgetall("vmpooler__odrequest__#{request_id}")
  Parsing.get_platform_pool_count(request_hash['requested']) do |platform_alias, pool, _count|
    pools_filled = redis.smembers("vmpooler__#{request_id}__#{platform_alias}__#{pool}")
    redis.pipelined do
      pools_filled&.each do |vm|
        move_vm_queue(pool, vm, 'running', 'completed', redis, "moved to completed queue. '#{request_id}' could not be filled in time")
      end
      redis.expire("vmpooler__#{request_id}__#{platform_alias}__#{pool}", expiration_ttl)
    end
  end
end

#repopulate_pool_vms(pool_name, provider, pool_check_response, pool_size) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1258

def repopulate_pool_vms(pool_name, provider, pool_check_response, pool_size)
  return if pool_mutex(pool_name).locked?

  @redis.with_metrics do |redis|
    redis.multi
    redis.scard("vmpooler__ready__#{pool_name}")
    redis.scard("vmpooler__pending__#{pool_name}")
    redis.scard("vmpooler__running__#{pool_name}")
    ready, pending, running = redis.exec
    total = pending.to_i + ready.to_i

    $metrics.gauge("ready.#{pool_name}", ready)
    $metrics.gauge("running.#{pool_name}", running)

    unless pool_size == 0
      if redis.get("vmpooler__empty__#{pool_name}")
        redis.del("vmpooler__empty__#{pool_name}") unless ready == 0
      elsif ready == 0
        redis.set("vmpooler__empty__#{pool_name}", 'true')
        $logger.log('s', "[!] [#{pool_name}] is empty")
      end
    end

    (pool_size - total.to_i).times do
      if redis.get('vmpooler__tasks__clone').to_i < $config[:config]['task_limit'].to_i
        begin
          redis.incr('vmpooler__tasks__clone')
          pool_check_response[:cloned_vms] += 1
          clone_vm(pool_name, provider)
        rescue StandardError => e
          $logger.log('s', "[!] [#{pool_name}] clone failed during check_pool with an error: #{e}")
          redis.decr('vmpooler__tasks__clone')
          raise
        end
      end
    end
  end
end

#request_expired?(request_id, score, redis) ⇒ Boolean 



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# File 'lib/vmpooler/pool_manager.rb', line 1516

def request_expired?(request_id, score, redis)
  delta = Time.now.to_i - score.to_i
  ondemand_request_ttl = $config[:config]['ondemand_request_ttl']
  return false unless delta > ondemand_request_ttl * 60

  $logger.log('s', "Ondemand request for '#{request_id}' failed to provision all instances within the configured ttl '#{ondemand_request_ttl}'")
  expiration_ttl = $config[:redis]['data_ttl'].to_i * 60 * 60
  redis.pipelined do
    redis.zrem('vmpooler__provisioning__processing', request_id)
    redis.hset("vmpooler__odrequest__#{request_id}", 'status', 'failed')
    redis.expire("vmpooler__odrequest__#{request_id}", expiration_ttl)
  end
  remove_vms_for_failed_request(request_id, expiration_ttl, redis)
  true
end

#reset_pool(pool) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1069

def reset_pool(pool)
  poolname = pool['name']
  @redis.with_metrics do |redis|
    break unless redis.sismember('vmpooler__poolreset', poolname)

    redis.srem('vmpooler__poolreset', poolname)
    mutex = pool_mutex(poolname)
    mutex.synchronize do
      drain_pool(poolname, redis)
      $logger.log('s', "[*] [#{poolname}] reset has cleared ready and pending instances")
    end
  end
end

#revert_vm_snapshot(pool_name, vm, snapshot_name, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 586

def revert_vm_snapshot(pool_name, vm, snapshot_name, provider)
  Thread.new do
    begin
      _revert_vm_snapshot(pool_name, vm, snapshot_name, provider)
    rescue StandardError => e
      $logger.log('d', "[!] [#{pool_name}] '#{vm}' failed while reverting snapshot: #{e}")
      raise
    end
  end
end

#sleep_with_wakeup_events(loop_delay, wakeup_period = 5, options = {}) ⇒ Object

Possible wakeup events :pool_size_change

- Fires when the number of ready VMs changes due to being consumed.
- Additional options
    :poolname

:pool_template_change

- Fires when a template configuration update is requested
- Additional options
    :poolname

:pool_reset

- Fires when a pool reset is requested
- Additional options
    :poolname

:undo_override

- Fires when a pool override removal is requested
- Additional options
    :poolname



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# File 'lib/vmpooler/pool_manager.rb', line 794

def sleep_with_wakeup_events(loop_delay, wakeup_period = 5, options = {})
  exit_by = Time.now + loop_delay
  wakeup_by = Time.now + wakeup_period
  return if time_passed?(:exit_by, exit_by)

  @redis.with_metrics do |redis|
    initial_ready_size = redis.scard("vmpooler__ready__#{options[:poolname]}") if options[:pool_size_change]

    initial_clone_target = redis.hget("vmpooler__pool__#{options[:poolname]}", options[:clone_target]) if options[:clone_target_change]

    initial_template = redis.hget('vmpooler__template__prepared', options[:poolname]) if options[:pool_template_change]

    loop do
      sleep(1)
      break if time_passed?(:exit_by, exit_by)

      # Check for wakeup events
      if time_passed?(:wakeup_by, wakeup_by)
        wakeup_by = Time.now + wakeup_period

        # Wakeup if the number of ready VMs has changed
        if options[:pool_size_change]
          ready_size = redis.scard("vmpooler__ready__#{options[:poolname]}")
          break unless ready_size == initial_ready_size
        end

        if options[:clone_target_change]
          clone_target = redis.hget('vmpooler__config__clone_target}', options[:poolname])
          break if clone_target && clone_target != initial_clone_target
        end

        if options[:pool_template_change]
          configured_template = redis.hget('vmpooler__config__template', options[:poolname])
          break if configured_template && initial_template != configured_template
        end

        if options[:pool_reset]
          pending = redis.sismember('vmpooler__poolreset', options[:poolname])
          break if pending
        end

        if options[:undo_override]
          break if redis.sismember('vmpooler__pool__undo_template_override', options[:poolname])
          break if redis.sismember('vmpooler__pool__undo_size_override', options[:poolname])
        end

        if options[:pending_vm]
          pending_vm_count = redis.scard("vmpooler__pending__#{options[:poolname]}")
          break unless pending_vm_count == 0
        end

        if options[:ondemand_request]
          redis.multi
          redis.zcard('vmpooler__provisioning__request')
          redis.zcard('vmpooler__provisioning__processing')
          redis.zcard('vmpooler__odcreate__task')
          od_request, od_processing, od_createtask = redis.exec
          break unless od_request == 0
          break unless od_processing == 0
          break unless od_createtask == 0
        end
      end

      break if time_passed?(:exit_by, exit_by)
    end
  end
end

#sync_pool_template(pool) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 923

def sync_pool_template(pool)
  @redis.with_metrics do |redis|
    pool_template = redis.hget('vmpooler__config__template', pool['name'])
    pool['template'] = pool_template if pool_template && pool['template'] != pool_template
  end
end

#time_passed?(_event, time) ⇒ Boolean

Helper method mainly used for unit testing



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# File 'lib/vmpooler/pool_manager.rb', line 772

def time_passed?(_event, time)
  Time.now > time
end

#undo_override(pool, provider) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1083

def undo_override(pool, provider)
  poolname = pool['name']
  mutex = pool_mutex(poolname)
  return if mutex.locked?

  @redis.with_metrics do |redis|
    break unless redis.sismember('vmpooler__pool__undo_template_override', poolname)

    redis.srem('vmpooler__pool__undo_template_override', poolname)
    template_now = pool['template']
    template_original = $config[:pools_at_startup][$config[:pool_index][poolname]]['template']

    mutex.synchronize do
      update_pool_template(pool, provider, template_original, template_now, redis)
    end
  end

  @redis.with_metrics do |redis|
    break unless redis.sismember('vmpooler__pool__undo_size_override', poolname)

    redis.srem('vmpooler__pool__undo_size_override', poolname)
    pool_size_now = pool['size']
    pool_size_original = $config[:pools_at_startup][$config[:pool_index][poolname]]['size']

    mutex.synchronize do
      pool['size'] = pool_size_original
    end

    $logger.log('s', "[*] [#{poolname}] size updated from #{pool_size_now} to #{pool_size_original}")
  end
end

#update_clone_target(pool) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1001

def update_clone_target(pool)
  mutex = pool_mutex(pool['name'])
  return if mutex.locked?

  @redis.with_metrics do |redis|
    clone_target = redis.hget('vmpooler__config__clone_target', pool['name'])
    break if clone_target.nil?
    break if clone_target == pool['clone_target']

    $logger.log('s', "[*] [#{pool['name']}] clone updated from #{pool['clone_target']} to #{clone_target}")
    mutex.synchronize do
      pool['clone_target'] = clone_target
      # Remove all ready and pending VMs so new instances are created for the new clone_target
      drain_pool(pool['name'], redis)
    end
    $logger.log('s', "[*] [#{pool['name']}] is ready for use")
  end
end

#update_pool_size(pool) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 1049

def update_pool_size(pool)
  mutex = pool_mutex(pool['name'])
  return if mutex.locked?

  @redis.with_metrics do |redis|
    pool_size_requested = redis.hget('vmpooler__config__poolsize', pool['name'])
    break if pool_size_requested.nil?

    pool_size_requested = Integer(pool_size_requested)
    pool_size_currently = pool['size']
    break if pool_size_requested == pool_size_currently

    mutex.synchronize do
      pool['size'] = pool_size_requested
    end

    $logger.log('s', "[*] [#{pool['name']}] size updated from #{pool_size_currently} to #{pool_size_requested}")
  end
end

#update_pool_template(pool, provider, configured_template, prepared_template, redis) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 990

def update_pool_template(pool, provider, configured_template, prepared_template, redis)
  pool['template'] = configured_template
  $logger.log('s', "[*] [#{pool['name']}] template updated from #{prepared_template} to #{configured_template}")
  # Remove all ready and pending VMs so new instances are created from the new template
  drain_pool(pool['name'], redis)
  # Prepare template for deployment
  $logger.log('s', "[*] [#{pool['name']}] preparing pool template for deployment")
  prepare_template(pool, provider, redis)
  $logger.log('s', "[*] [#{pool['name']}] is ready for use")
end

#used_providers ⇒ Array

ie. [“dummy”]



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# File 'lib/vmpooler/pool_manager.rb', line 621

def used_providers
  # create an array of provider classes based on the config
  if config[:providers]
    config_provider_names = config[:providers].keys
    config_providers = config_provider_names.map do |config_provider_name|
      if config[:providers][config_provider_name] && config[:providers][config_provider_name]['provider_class']
        config[:providers][config_provider_name]['provider_class'].to_s
      else
        config_provider_name.to_s
      end
    end.compact.uniq
  else
    config_providers = []
  end
  # return the unique array of providers from the config and VMPooler defaults
  @used_providers ||= (config_providers + default_providers).uniq
end

#vm_mutex(vmname) ⇒ Object 



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# File 'lib/vmpooler/pool_manager.rb', line 915

def vm_mutex(vmname)
  @vm_mutex[vmname] || @vm_mutex[vmname] = Mutex.new
end

#vm_still_ready?(pool_name, vm_name, provider, redis) ⇒ Boolean 



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# File 'lib/vmpooler/pool_manager.rb', line 180

def vm_still_ready?(pool_name, vm_name, provider, redis)
  # Check if the VM is still ready/available
  return true if provider.vm_ready?(pool_name, vm_name)

  raise("VM #{vm_name} is not ready")
rescue StandardError
  move_vm_queue(pool_name, vm_name, 'ready', 'completed', redis, "is unreachable, removed from 'ready' queue")
end

#vms_ready?(request_id, redis) ⇒ Boolean 



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# File 'lib/vmpooler/pool_manager.rb', line 1479

def vms_ready?(request_id, redis)
  catch :request_not_ready do
    request_hash = redis.hgetall("vmpooler__odrequest__#{request_id}")
    Parsing.get_platform_pool_count(request_hash['requested']) do |platform_alias, pool, count|
      pools_filled = redis.scard("vmpooler__#{request_id}__#{platform_alias}__#{pool}")
      throw :request_not_ready unless pools_filled.to_i == count.to_i
    end
    return true
  end
  false
end