Cloudless Resource Management Data Transfer Objects

List of Data Transfer Objects that:

• are encapsulated in UDP packets and transferred back and forth between workers and collector in the generation layer
• are exchanged within between modules inside either worker or collector

List of DTOs

Internal objects

• PortInfo: a pair of (daemon_name,port_number) showing that a daemon can receive packets at certain port, and is encapsulated in HostInfo object.

  Ex: collectord:9090 => collectord service is listening at port 9090

• HostType: enum class, label of host used to identify which kind that host is and is encapsulated in HostInfo object.

  Ex: WORKER => worker host; COLLECTOR => collector host.

• HostInfo: information of a single host (collector or worker) that will be sent to other host by encapsulated in ProbeInit or ProbeAck object.

  Ex:

  COLLECTOR-collector[10.0.0.2] - ports: [coordinatord:10100, collectord:9090]
  

  => hostname: collector; ip_address: 10.0.0.2, 2 daemons: collectord listening at port 9090 & coordinatord listening at port 10100; host_type: COLLECTOR

• CrmPktType: enum class, label of packet used to identify which kind that data inside a UDP segment is and is encapsulated in ProbeInit, ProbeAck, or RegisterAck object/packet.

  Ex: PROBE_INIT => UDP packet of type ProbeInit; PROBE_ACK => UDP packet of type ProbeAck; REG_ACK => UDP packet of type RegisterAck packet.

• RegisterInfo: information regarding the creation of metric exporters in worker host and is encapsulated in RegisterAck object/packet.

  Ex:

  True - ('Successfully registered at collector host.',) - max remaining retries: 0
  

  => status: True; message: 'Successfully registered to collector host.'; max_retries: 0

  False - ('Failed to register at collector host.',) - max remaining retries: 3
  

  => status: False; message: 'Failed to register to collector host.'; max_retries: 3

Application layer PDU

• ProbeInit: broadcasted by collector host (in fixed interval) to all worker host within current subnet.

  Ex:

  {"py/object": "dtos.probe_init.ProbeInit", "id": "78f6ac6d-ec8d-44cf-abc8-584e4255e9d3", "info": {"py/object": "dtos.host_info.HostInfo", "hostname": "collector", "inet_addr": "10.0.0.2", "ports": [{"py/object": "dtos.port_info.PortInfo", "daemon": "coordinatord", "port": 10100}, {"py/object": "dtos.port_info.PortInfo", "daemon": "collectord", "port": 9090}], "type": {"py/reduce": [{"py/type": "dtos.host_type.HostType"}, {"py/tuple": [2]}]}}, "type": {"py/reduce": [{"py/type": "dtos.crm_pkt_type.CrmPktType"}, {"py/tuple": [1]}]}}
  

  => object: ProbeInit; packet-id: 78f6ac6d-ec8d-44cf-abc8-584e4255e9d3; HostInfo: hostname=collector, inet_addr=10.0.0.2

• ProbeAck: sent by worker host as reply to ProbeInit packet of collector host

  Ex:

• RegisterAck:

Versions:

• 2.1.x: with QueryAck
• 3.x.x: without QueryAck