Class: CloudCrowd::NodeRecord
- Inherits:
-
ActiveRecord::Base
- Object
- ActiveRecord::Base
- CloudCrowd::NodeRecord
- Defined in:
- lib/cloud_crowd/models/node_record.rb
Overview
A NodeRecord is the central server’s record of a Node running remotely. We can use it to assign WorkUnits to the Node, and keep track of its status. When a Node exits, it destroys this record.
Defined Under Namespace
Classes: Serializer
Constant Summary collapse
- PORT =
Extract the port number from the host id.
/:(\d+)\Z/
Class Method Summary collapse
-
.check_in(params, request) ⇒ Object
Register a Node with the central server.
Instance Method Summary collapse
-
#actions ⇒ Object
What Actions is this Node able to run?.
- #active_model_serializer ⇒ Object
-
#busy? ⇒ Boolean
Is this Node too busy for more work? Determined by number of workers, or the Node’s load average, as configured in config.yml.
-
#display_status ⇒ Object
The printable status of the Node.
-
#node ⇒ Object
Keep a RestClient::Resource handy for contacting the Node, including HTTP authentication, if configured.
-
#release_work_units ⇒ Object
Release all of this Node’s WorkUnits for other nodes to take.
-
#send_work_unit(unit) ⇒ Object
Dispatch a WorkUnit to this node.
- #to_json ⇒ Object
-
#url ⇒ Object
The URL at which this Node may be reached.
-
#worker_pids ⇒ Object
A list of the process ids of the workers currently being run by the Node.
Class Method Details
.check_in(params, request) ⇒ Object
Register a Node with the central server. This happens periodically (once every ‘Node::CHECK_IN_INTERVAL` seconds). Nodes will be de-registered if they checked in within a reasonable interval.
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# File 'lib/cloud_crowd/models/node_record.rb', line 26 def self.check_in(params, request) attrs = { :ip_address => request.ip, :port => params[:host].match(PORT)[1].to_i, :busy => params[:busy], :tag => params[:tag], :max_workers => params[:max_workers], :enabled_actions => params[:enabled_actions] } self.find_or_create_by(:host => params[:host]).update_attributes!(attrs) end |
Instance Method Details
#actions ⇒ Object
What Actions is this Node able to run?
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# File 'lib/cloud_crowd/models/node_record.rb', line 61 def actions @actions ||= enabled_actions.split(',') end |
#active_model_serializer ⇒ Object
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# File 'lib/cloud_crowd/models/node_record.rb', line 112 def active_model_serializer; Serializer; end |
#busy? ⇒ Boolean
Is this Node too busy for more work? Determined by number of workers, or the Node’s load average, as configured in config.yml.
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# File 'lib/cloud_crowd/models/node_record.rb', line 67 def busy? busy || (max_workers && work_units.count >= max_workers) end |
#display_status ⇒ Object
The printable status of the Node.
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# File 'lib/cloud_crowd/models/node_record.rb', line 84 def display_status busy? ? 'busy' : 'available' end |
#node ⇒ Object
Keep a RestClient::Resource handy for contacting the Node, including HTTP authentication, if configured.
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# File 'lib/cloud_crowd/models/node_record.rb', line 79 def node @node ||= RestClient::Resource.new(url, CloudCrowd.) end |
#release_work_units ⇒ Object
Release all of this Node’s WorkUnits for other nodes to take.
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# File 'lib/cloud_crowd/models/node_record.rb', line 94 def release_work_units WorkUnit.where("node_record_id = #{id}").update_all('node_record_id = null, worker_pid = null') end |
#send_work_unit(unit) ⇒ Object
Dispatch a WorkUnit to this node. Places the node at back at the end of the rotation. If we fail to send the WorkUnit, we consider the node to be down, and remove this record, freeing up all of its checked-out work units. If the Node responds that it’s overloaded, we mark it as busy. Returns true if the WorkUnit was dispatched successfully.
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# File 'lib/cloud_crowd/models/node_record.rb', line 43 def send_work_unit(unit) result = node['/work'].post(:work_unit => unit.to_json) unit.assign_to(self, JSON.parse(result.body)['pid']) touch && true rescue RestClient::RequestTimeout # The node's gone away. Destroy it and it will check in when it comes back puts "Node #{host} received RequestTimeout, removing it" destroy && false rescue RestClient::RequestFailed => e raise e unless e.http_code == 503 && e.http_body == Node::OVERLOADED_MESSAGE update_attribute(:busy, true) && false rescue RestClient::Exception, Errno::ECONNREFUSED, Timeout::Error, Errno::ECONNRESET=>e # Couldn't post to node, assume it's gone away. puts "Node #{host} received #{e.class} #{e}, removing it" destroy && false end |
#to_json ⇒ Object
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# File 'lib/cloud_crowd/models/node_record.rb', line 114 def to_json Serializer.new(self).to_json end |
#url ⇒ Object
The URL at which this Node may be reached. TODO: Make sure that the host actually has externally accessible DNS.
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# File 'lib/cloud_crowd/models/node_record.rb', line 73 def url @url ||= "http://#{host}" end |
#worker_pids ⇒ Object
A list of the process ids of the workers currently being run by the Node.
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# File 'lib/cloud_crowd/models/node_record.rb', line 89 def worker_pids work_units.pluck('worker_pid') end |