Class: Bosh::Director::AgentClient

Inherits:
Object
  • Object
show all
Defined in:
lib/bosh/director/agent_client.rb

Constant Summary collapse

DEFAULT_POLL_INTERVAL = 
1.0

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(service_name, client_id, options = {}) ⇒ AgentClient

Returns a new instance of AgentClient.



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# File 'lib/bosh/director/agent_client.rb', line 23

def initialize(service_name, client_id, options = {})
  @service_name = service_name
  @client_id = client_id
  @nats_rpc = Config.nats_rpc
  @timeout = options[:timeout] || 45
  @logger = Config.logger
  @retry_methods = options[:retry_methods] || {}

  if options[:credentials]
    @encryption_handler =
      Bosh::Core::EncryptionHandler.new(@client_id, options[:credentials])
  end

  @resource_manager = Api::ResourceManager.new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 39

def method_missing(method_name, *args)
  send_message(method_name, *args)
end

Instance Attribute Details

#id ⇒ Object

Returns the value of attribute id.



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# File 'lib/bosh/director/agent_client.rb', line 7

def id
  @id
end

Class Method Details

.with_defaults(id, options = {}) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 9

def self.with_defaults(id, options = {})
  defaults = {
    retry_methods: { # in case of timeout errors
                     get_state: 2,
                     get_task: 2,
    }
  }

  credentials = Bosh::Director::Models::Vm.find(:agent_id => id).credentials
  defaults.merge!(credentials: credentials) if credentials

  self.new('agent', id, defaults.merge(options))
end

Instance Method Details

#apply(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 47

def apply(*args)
  send_long_running_message(:apply, *args)
end

#compile_package(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 51

def compile_package(*args)
  send_long_running_message(:compile_package, *args)
end

#drain(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 55

def drain(*args)
  send_long_running_message(:drain, *args)
end

#fetch_logs(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 59

def fetch_logs(*args)
  send_long_running_message(:fetch_logs, *args)
end

#format_exception(exception) ⇒ String

Returns formatted exception information

Parameters:

  • exception (Hash|#to_s) —

    Serialized exception

Returns:

  • (String) 


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# File 'lib/bosh/director/agent_client.rb', line 154

def format_exception(exception)
  return exception.to_s unless exception.is_a?(Hash)

  msg = exception["message"].to_s

  if exception["backtrace"]
    msg += "\n"
    msg += Array(exception["backtrace"]).join("\n")
  end

  if exception["blobstore_id"]
    blob = download_and_delete_blob(exception["blobstore_id"])
    msg += "\n"
    msg += blob.to_s
  end

  msg
end

#handle_method(method_name, args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 97

def handle_method(method_name, args)
  result = {}
  result.extend(MonitorMixin)

  cond = result.new_cond
  timeout_time = Time.now.to_f + @timeout

  request = { :method => method_name, :arguments => args }

  if @encryption_handler
    @logger.info("Request: #{request}")
    request = { "encrypted_data" => @encryption_handler.encrypt(request) }
    request["session_id"] = @encryption_handler.session_id
  end

  recipient = "#{@service_name}.#{@client_id}"

  request_id = @nats_rpc.send_request(recipient, request) do |response|
    if @encryption_handler
      begin
        response = @encryption_handler.decrypt(response["encrypted_data"])
      rescue Bosh::Core::EncryptionHandler::CryptError => e
        response["exception"] = "CryptError: #{e.inspect} #{e.backtrace}"
      end
      @logger.info("Response: #{response}")
    end

    result.synchronize do
      inject_compile_log(response)
      result.merge!(response)
      cond.signal
    end
  end

  result.synchronize do
    while result.empty?
      timeout = timeout_time - Time.now.to_f
      unless timeout > 0
        @nats_rpc.cancel_request(request_id)
        raise RpcTimeout,
              "Timed out sending `#{method_name}' to #{@client_id} " +
                "after #{@timeout} seconds"
      end
      cond.wait(timeout)
    end
  end

  if result.has_key?("exception")
    raise RpcRemoteException, format_exception(result["exception"])
  end

  result["value"]
end

#migrate_disk(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 63

def migrate_disk(*args)
  send_long_running_message(:migrate_disk, *args)
end

#mount_disk(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 67

def mount_disk(*args)
  send_long_running_message(:mount_disk, *args)
end

#prepare(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 43

def prepare(*args)
  send_long_running_message(:prepare, *args)
end

#stop(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 75

def stop(*args)
  send_long_running_message(:stop, *args)
end

#unmount_disk(*args) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 71

def unmount_disk(*args)
  send_long_running_message(:unmount_disk, *args)
end

#wait_until_ready(deadline = 600) ⇒ Object 



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# File 'lib/bosh/director/agent_client.rb', line 79

def wait_until_ready(deadline = 600)
  old_timeout = @timeout
  @timeout = 1.0
  @deadline = Time.now.to_i + deadline

  begin
    ping
  rescue RpcTimeout
    retry if @deadline - Time.now.to_i > 0
    raise RpcTimeout, "Timed out pinging to #{@client_id} after #{deadline} seconds"
  rescue RpcRemoteException => e
    retry if e.message =~ /^restarting agent/ && @deadline - Time.now.to_i > 0
    raise e
  ensure
    @timeout = old_timeout
  end
end