Class: Service

Inherits:
ActiveRecord::Base
  • Object
show all
Includes:
MKIt::DockerHelper, MKIt::ERBHelper
Defined in:
lib/mkit/app/model/service.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from MKIt::DockerHelper

#attach_network, #clear_logs, #create_instance, #create_network, #create_volume, #delete_volume, #dettach_network, #execute_local, #inspect_instance, #inspect_volume, #logfile, #logs, #network_exists?, #remove_instance, #remove_network, #start_instance, #stop_instance

Methods included from MKIt::ERBHelper

#parse_model, #parse_template, #read_template

Class Method Details

.create(yaml) ⇒ Object

Raises:



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# File 'lib/mkit/app/model/service.rb', line 35

def self.create(yaml)
  config = yaml["service"]
  raise MKIt::ServiceAlreadyExists.new unless Service.find_by_name(config.name).nil?

  ActiveRecord::Base.transaction do
    srv = Service.new(
      name: config.name,
      version: 1,
      image: config.image,
      command: config.command,
      status: MKIt::Status::CREATING
    )

    # reserve pool ip
    srv.lease = Pool.find_by_name(MKIt::Utils.me).reserve_for(srv)

    srv.dns_host = DnsHost.new(
      service: srv,
      name: srv.name,
      ip: srv.lease.ip
    )

    # create service network
    srv.deploy_network

    # configure
    srv.configure(config)
    #
    srv.status = MKIt::Status::CREATED
    srv.save!
    data = { service_id: srv.id, version: srv.version }
    # create pod
    (1..srv.min_replicas).each { |i|
      pd = Pod.new( status: MKIt::Status::CREATED, name: SecureRandom.uuid.gsub('-','')[0..11])
      srv.pod << pd
      MkitJob.publish(topic: :create_pod_saga, data: {pod_name: pd.name})
    }
    srv
  end
end

Instance Method Details

#add_service_config(key, value) ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 151

def add_service_config(key, value)
  v = ServiceConfig.create(service: self, key: key, value: value)
  self.service_config << v
  v
end

#add_volume(volume_config) ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 145

def add_volume(volume_config)
  v = Volume.create(self, volume_config)
  self.volume << v
  v
end

#as_json(options = {}) ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 300

def as_json(options = {})
  srv = super
  a=[:pod, :volume, :service_config, :ingress]
  a.each { | k | 
    srv[k] ||= []
    self.send(k).each { |v| 
      srv[k] << v.as_json
    }
  }
  srv
end

#clean_up ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 224

def clean_up
  my_addr = self.lease.ip.split('.')[3]
  filename = "#{'%04i' % my_addr.to_i}_#{self.name}.cfg"
  MkitJob.publish(topic: :destroy_proxy_config, data: {filename: filename})
end

#configure(config) ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 76

def configure(config)
  self.image = config.image if config.image != self.image
  self.command = config.command if config.command != self.command

  unless config.resources.nil?
    self.max_replicas = config.resources.max_replicas unless config.resources.max_replicas.nil? || config.resources.max_replicas < 1
    self.min_replicas = config.resources.min_replicas unless config.resources.min_replicas.nil? || config.resources.min_replicas < 1
  else
    self.min_replicas = 1
    self.max_replicas = 1
  end
  self.max_replicas = self.min_replicas if self.min_replicas > self.max_replicas

  # docker network
  if config.network.nil? || config.network.empty?
    self.pods_network="mkit"
  else
    self.pods_network=config.network
  end
  self.create_pods_network

  # haproxy config
  self.ingress = Ingress.create(config.ingress)

  # volumes
  self.volume = []
  config.volumes&.each { |volume|
    self.add_volume(volume)
  }
  # environment
  self.service_config=[]
  config.environment&.each_pair { |key,value|
    self.add_service_config(key, value)
  }
  self.volume.each { | volume |
    volume.deploy
  }
end

#create_pods_network ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 135

def create_pods_network
  create_network(self.pods_network) unless network_exists?(self.pods_network)
end

#current_configs ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 157

def current_configs
  self.service_config&.select{ |x| x.ctype == MKIt::CType::ENVIRONMENT.to_s && x.version == self.version}
end

#current_ports ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 161

def current_ports
  self.service_port&.select{ |x| x.version == self.version}
end

#deploy_network ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 139

def deploy_network
  # create service interface...
  self.lease.confirm
  self.lease.up
end

#find_pod_by_id_or_name(pod_id) ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 230

def find_pod_by_id_or_name(pod_id)
  pod = self.pod.find_by(id: pod_id)
  pod = self.pod.find_by(name: pod_id) unless pod
  pod
end

#log ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 250

def log
  out = ""
  self.pod.each { |p|
    out << "<<<< %s | %s >>>>\n" % [self.name, p.name]
    out << logs(p.name)
  }
  out
end

#my_dns ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 165

def my_dns
  MKIt::Interface.ip
end

#parse ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 220

def parse
  parse_model(MKIt::Templates::HAPROXY).result(binding)
end

#proxy_config ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 211

def proxy_config
  # config
  haproxy = parse
  my_addr = self.lease.ip.split('.')[3]
  filename = "#{'%04i' % my_addr.to_i}_#{self.name}.cfg"
  MKItLogger.debug("haproxy config file: #{filename}")
  {filename: filename, data: haproxy}
end

#start ⇒ Object

ctrl



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# File 'lib/mkit/app/model/service.rb', line 238

def start
  self.pod.each { |p|
    MkitJob.publish(topic: :start_pod, service_id: self.id, pod_id: p.id)
  }
end

#stop ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 244

def stop
  self.pod.each { |p|
    MkitJob.publish(topic: :stop_pod, service_id: self.id, pod_id: p.id)
  }
end

#to_h(options = {}) ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 258

def to_h(options = {})
  details = options[:details] || false

  yaml = {}
  yaml['service'] = {}
  srv = yaml['service']
  srv['name'] = self.name
  srv['image'] = self.image
  srv['command'] = self.command
  srv['network'] = self.pods_network
  if details
    srv['status'] = self.status
    srv['version'] = self.version
    srv['ip'] = self.lease.ip
    srv['dns'] = self.dns_host.name
    srv['pods'] = []
    self.pod.each { |p|
      srv['pods'] << p.to_h
    }
  end

  # ingress
  srv['ingress'] = self.ingress.to_h(options)

  srv['resources'] = {}
  srv['resources']['min_replicas'] = self.min_replicas
  srv['resources']['max_replicas'] = self.max_replicas
  srv['volumes'] = []
  self.volume.each { |v|
    if v.ctype ==  MKIt::CType::DOCKER_STORAGE.to_s
      srv['volumes'] << "docker://#{v.name}:#{v.path}"
    elsif v.ctype ==  MKIt::CType::LOCAL_STORAGE.to_s
      srv['volumes'] << "#{v.name}:#{v.path}"
    end
  }
  srv['environment'] = {}
  self.service_config.each { |c|
    srv['environment'][c.key] = "#{c.value}"
  }
  yaml
end

#update!(yaml) ⇒ Object 



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# File 'lib/mkit/app/model/service.rb', line 115

def update!(yaml)
  ActiveRecord::Base.transaction do
    config = yaml["service"]
    raise MKIt::ServiceNameMismatch.new unless config.name == self.name
    self.version+=1
    self.configure(config)

    # destroy old pods...
    self.pod.destroy_all
    # create pod
    data = { service_id: self.id, version: self.version }
    (1..self.min_replicas).each { |i|
      pd = Pod.new( status: MKIt::Status::CREATED, name: SecureRandom.uuid.gsub('-','')[0..11])
      self.pod << pd
      MkitJob.publish(topic: :create_pod_saga, data: {pod_name: pd.name})
    }
    self.save
  end
end

#update_proxy ⇒ Object

ha proxy configs & template



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# File 'lib/mkit/app/model/service.rb', line 207

def update_proxy
  MkitJob.publish(topic: :update_proxy_config, application_id: self.id, data: proxy_config)
end

#update_status! ⇒ Object

TODO

refactor to remove it from db model and check if it is needed
this will be the pod status



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# File 'lib/mkit/app/model/service.rb', line 172

def update_status!
  combined_status = nil
  self.pod.each { |pod|
    child_status = pod.set_status_from_docker
    if combined_status
      case combined_status
      when MKIt::Status::RUNNING
        case child_status
        when MKIt::Status::STOPPED || MKIt::Status::PENDING
          combined_status = MKIt::Status::DEGRATED
        end
      when MKIt::Status::STOPPED
        case child_status
        when MKIt::Status::RUNNING || MKIt::Status::PENDING
          combined_status = MKIt::Status::DEGRATED
        end
      when MKIt::Status::PENDING
        case child_status
        when MKIt::Status::RUNNING || MKIt::Status::STOPPED
          combined_status = MKIt::Status::DEGRATED
        end
      end
    else
      combined_status = child_status
    end
  }
  combined_status = MKIt::Status::CREATING unless combined_status
  self.status = combined_status
  self.save
  self.status
end