Class: Datadog::Core::Remote::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/datadog/core/remote/client.rb,
lib/datadog/core/remote/client/capabilities.rb

Overview

Client communicates with the agent and sync remote configuration

Defined Under Namespace

Classes: Capabilities, SyncError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(transport, capabilities, repository: Configuration::Repository.new) ⇒ Client

Returns a new instance of Client.



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# File 'lib/datadog/core/remote/client.rb', line 17

def initialize(transport, capabilities, repository: Configuration::Repository.new)
  @transport = transport

  @repository = repository
  @id = SecureRandom.uuid
  @dispatcher = Dispatcher.new
  @capabilities = capabilities

  @capabilities.receivers.each do |receiver|
    dispatcher.receivers << receiver
  end
end

Instance Attribute Details

#dispatcher ⇒ Object (readonly)

Returns the value of attribute dispatcher.



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# File 'lib/datadog/core/remote/client.rb', line 15

def dispatcher
  @dispatcher
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/datadog/core/remote/client.rb', line 15

def id
  @id
end

#repository ⇒ Object (readonly)

Returns the value of attribute repository.



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# File 'lib/datadog/core/remote/client.rb', line 15

def repository
  @repository
end

#transport ⇒ Object (readonly)

Returns the value of attribute transport.



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# File 'lib/datadog/core/remote/client.rb', line 15

def transport
  @transport
end

Instance Method Details

#sync ⇒ Object

rubocop:disable Metrics/AbcSize,Metrics/PerceivedComplexity



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# File 'lib/datadog/core/remote/client.rb', line 31

def sync
  # TODO: Skip sync if no capabilities are registered
  response = transport.send_config(payload)

  if response.ok?
    # when response is completely empty, do nothing as in: leave as is
    if response.empty?
      Datadog.logger.debug { 'remote: empty response => NOOP' }

      return
    end

    paths = response.client_configs.map do |path|
      Configuration::Path.parse(path)
    end

    targets = Configuration::TargetMap.parse(response.targets)

    contents = Configuration::ContentList.parse(response.target_files)

    # TODO: sometimes it can strangely be so that paths.empty?
    # TODO: sometimes it can strangely be so that targets.empty?

    changes = repository.transaction do |current, transaction|
      # paths to be removed: previously applied paths minus ingress paths
      (current.paths - paths).each { |p| transaction.delete(p) }

      # go through each ingress path
      paths.each do |path|
        # match target with path
        target = targets[path]

        # abort entirely if matching target not found
        raise SyncError, "no target for path '#{path}'" if target.nil?

        # new paths are not in previously applied paths
        new = !current.paths.include?(path)

        # updated paths are in previously applied paths
        # but the content hash changed
        changed = current.paths.include?(path) && !current.contents.find_content(path, target)

        # skip if unchanged
        same = !new && !changed

        next if same

        # match content with path and target
        content = contents.find_content(path, target)

        # abort entirely if matching content not found
        raise SyncError, "no valid content for target at path '#{path}'" if content.nil?

        # to be added or updated << config
        # TODO: metadata (hash, version, etc...)
        transaction.insert(path, target, content) if new
        transaction.update(path, target, content) if changed
      end

      # save backend opaque backend state
      transaction.set(opaque_backend_state: targets.opaque_backend_state)
      transaction.set(targets_version: targets.version)

      # upon transaction end, new list of applied config + metadata (add, change, remove) will be saved
      # TODO: also remove stale config (matching removed) from cache (client configs is exhaustive list of paths)
    end

    if changes.empty?
      Datadog.logger.debug { 'remote: no changes' }
    else
      dispatcher.dispatch(changes, repository)
    end
  else
    raise SyncError, "unexpected transport response: #{response.inspect}"
  end
end