Class: KubernetesDeploy::KubernetesResource

Inherits:
Object
  • Object
show all
Defined in:
lib/kubernetes-deploy/kubernetes_resource.rb

Defined Under Namespace

Classes: Event

Constant Summary collapse

TIMEOUT = 
5.minutes
LOG_LINE_COUNT = 
250
DEBUG_RESOURCE_NOT_FOUND_MESSAGE = 
"None found. Please check your usual logging service (e.g. Splunk)."
UNUSUAL_FAILURE_MESSAGE = 
<<~MSG
It is very unusual for this resource type to fail to deploy. Please try the deploy again.
If that new deploy also fails, contact your cluster administrator.
MSG
STANDARD_TIMEOUT_MESSAGE = 
<<~MSG
Kubernetes will continue to attempt to deploy this resource in the cluster, but at this point it is considered unlikely that it will succeed.
If you have reason to believe it will succeed, retry the deploy to continue to monitor the rollout.
MSG

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(namespace:, context:, definition:, logger:) ⇒ KubernetesResource

Returns a new instance of KubernetesResource.



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 45

def initialize(namespace:, context:, definition:, logger:)
  # subclasses must also set these if they define their own initializer
  @name = definition.dig("metadata", "name")
  unless @name.present?
    logger.summary.add_paragraph("Rendered template content:\n#{definition.to_yaml}")
    raise FatalDeploymentError, "Template is missing required field metadata.name"
  end

  @namespace = namespace
  @context = context
  @logger = logger
  @definition = definition
  @statsd_report_done = false
  @validation_error_msg = nil
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 9

def context
  @context
end

#deploy_started=(value) ⇒ Object (writeonly)

Sets the attribute deploy_started

Parameters:

  • value —

    the value to set the attribute deploy_started to.



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 10

def deploy_started=(value)
  @deploy_started = value
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 9

def name
  @name
end

#namespace ⇒ Object (readonly)

Returns the value of attribute namespace.



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 9

def namespace
  @namespace
end

#type ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 105

def type
  @type || self.class.name.split('::').last
end

#validation_error_msg ⇒ Object (readonly)

Returns the value of attribute validation_error_msg.



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 9

def validation_error_msg
  @validation_error_msg
end

Class Method Details

.build(namespace:, context:, definition:, logger:) ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 25

def self.build(namespace:, context:, definition:, logger:)
  opts = { namespace: namespace, context: context, definition: definition, logger: logger }
  if KubernetesDeploy.const_defined?(definition["kind"])
    klass = KubernetesDeploy.const_get(definition["kind"])
    klass.new(**opts)
  else
    inst = new(**opts)
    inst.type = definition["kind"]
    inst
  end
end

.timeout ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 37

def self.timeout
  self::TIMEOUT
end

Instance Method Details

#debug_message ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 123

def debug_message
  helpful_info = []
  if deploy_failed?
    helpful_info << ColorizedString.new("#{id}: FAILED").red
    helpful_info << failure_message if failure_message.present?
  else
    helpful_info << ColorizedString.new("#{id}: TIMED OUT").yellow + " (limit: #{timeout}s)"
    helpful_info << timeout_message if timeout_message.present?
  end
  helpful_info << "  - Final status: #{status}"

  events = fetch_events
  if events.present?
    helpful_info << "  - Events (common success events excluded):"
    events.each do |identifier, event_hashes|
      event_hashes.each { |event| helpful_info << "      [#{identifier}]\t#{event}" }
    end
  else
    helpful_info << "  - Events: #{DEBUG_RESOURCE_NOT_FOUND_MESSAGE}"
  end

  if respond_to?(:fetch_logs)
    container_logs = fetch_logs
    if container_logs.blank? || container_logs.values.all?(&:blank?)
      helpful_info << "  - Logs: #{DEBUG_RESOURCE_NOT_FOUND_MESSAGE}"
    else
      sorted_logs = container_logs.sort_by { |_, log_lines| log_lines.length }
      sorted_logs.each do |identifier, log_lines|
        if log_lines.empty?
          helpful_info << "  - Logs from container '#{identifier}': #{DEBUG_RESOURCE_NOT_FOUND_MESSAGE}"
          next
        end

        helpful_info << "  - Logs from container '#{identifier}' (last #{LOG_LINE_COUNT} lines shown):"
        log_lines.each do |line|
          helpful_info << "      #{line}"
        end
      end
    end
  end

  helpful_info.join("\n")
end

#deploy_failed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 85

def deploy_failed?
  false
end

#deploy_finished? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 109

def deploy_finished?
  deploy_failed? || deploy_succeeded? || deploy_timed_out?
end

#deploy_method ⇒ Object

Expected values: :apply, :replace, :replace_force



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 119

def deploy_method
  :apply
end

#deploy_succeeded? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 89

def deploy_succeeded?
  if @deploy_started && !@success_assumption_warning_shown
    @logger.warn("Don't know how to monitor resources of type #{type}. Assuming #{id} deployed successfully.")
    @success_assumption_warning_shown = true
  end
  true
end

#deploy_timed_out? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 113

def deploy_timed_out?
  return false unless @deploy_started
  !deploy_succeeded? && !deploy_failed? && (Time.now.utc - @deploy_started > timeout)
end

#exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 97

def exists?
  nil
end

#failure_message ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 189

def failure_message
end

#fetch_events ⇒ Object

Returns a hash in the following format: 

"pod/web-1" => [
  "Pulling: pulling image "hello-world:latest" (1 events)",
  "Pulled: Successfully pulled image "hello-world:latest" (1 events)"
]




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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 174

def fetch_events
  return {} unless exists?
  out, _err, st = kubectl.run("get", "events", "--output=go-template=#{Event.go_template_for(type, name)}")
  return {} unless st.success?

  event_collector = Hash.new { |hash, key| hash[key] = [] }
  Event.extract_all_from_go_template_blob(out).each_with_object(event_collector) do |candidate, events|
    events[id] << candidate.to_s if candidate.seen_since?(@deploy_started - 5.seconds)
  end
end

#file_path ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 78

def file_path
  file.path
end

#id ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 74

def id
  "#{type}/#{name}"
end

#kubectl ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 198

def kubectl
  @kubectl ||= Kubectl.new(namespace: @namespace, context: @context, logger: @logger, log_failure_by_default: false)
end

#pretty_status ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 192

def pretty_status
  padding = " " * [50 - id.length, 1].max
  msg = exists? ? status : "not found"
  "#{id}#{padding}#{msg}"
end

#report_status_to_statsd(watch_time) ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 202

def report_status_to_statsd(watch_time)
  unless @statsd_report_done
    ::StatsD.measure('resource.duration', watch_time, tags: statsd_tags)
    @statsd_report_done = true
  end
end

#status ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 101

def status
  @status ||= "Unknown"
end

#sync ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 82

def sync
end

#timeout ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 41

def timeout
  self.class.timeout
end

#timeout_message ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 185

def timeout_message
  STANDARD_TIMEOUT_MESSAGE
end

#validate_definition ⇒ Object 



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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 61

def validate_definition
  @validation_error_msg = nil
  command = ["create", "-f", file_path, "--dry-run", "--output=name"]
  _, err, st = kubectl.run(*command, log_failure: false)
  return true if st.success?
  @validation_error_msg = err
  false
end

#validation_failed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubernetes-deploy/kubernetes_resource.rb', line 70

def validation_failed?
  @validation_error_msg.present?
end