Class: Krane::Kubectl
- Inherits:
-
Object
- Object
- Krane::Kubectl
- Defined in:
- lib/krane/kubectl.rb
Defined Under Namespace
Classes: ResourceNotFoundError
Constant Summary collapse
- ERROR_MATCHERS =
{ not_found: /NotFound/, client_timeout: /Client\.Timeout exceeded while awaiting headers/, }
- DEFAULT_TIMEOUT =
15
- MAX_RETRY_DELAY =
16
- SERVER_DRY_RUN_MIN_VERSION =
"1.13"
Instance Method Summary collapse
- #client_version ⇒ Object
-
#initialize(task_config:, log_failure_by_default:, default_timeout: DEFAULT_TIMEOUT, output_is_sensitive_default: false) ⇒ Kubectl
constructor
A new instance of Kubectl.
- #retry_delay(attempt) ⇒ Object
- #run(*args, log_failure: nil, use_context: true, use_namespace: true, output: nil, raise_if_not_found: false, attempts: 1, output_is_sensitive: nil, retry_whitelist: nil) ⇒ Object
- #server_dry_run_enabled? ⇒ Boolean
- #server_version ⇒ Object
- #version_info ⇒ Object
Constructor Details
#initialize(task_config:, log_failure_by_default:, default_timeout: DEFAULT_TIMEOUT, output_is_sensitive_default: false) ⇒ Kubectl
Returns a new instance of Kubectl.
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# File 'lib/krane/kubectl.rb', line 18 def initialize(task_config:, log_failure_by_default:, default_timeout: DEFAULT_TIMEOUT, output_is_sensitive_default: false) @task_config = task_config @log_failure_by_default = log_failure_by_default @default_timeout = default_timeout @output_is_sensitive_default = output_is_sensitive_default end |
Instance Method Details
#client_version ⇒ Object
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# File 'lib/krane/kubectl.rb', line 78 def client_version version_info[:client] end |
#retry_delay(attempt) ⇒ Object
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# File 'lib/krane/kubectl.rb', line 64 def retry_delay(attempt) # exponential backoff starting at 1s with cap at 16s, offset by up to 0.5s [2**(attempt - 1), MAX_RETRY_DELAY].min - Random.rand(0.5).round(1) end |
#run(*args, log_failure: nil, use_context: true, use_namespace: true, output: nil, raise_if_not_found: false, attempts: 1, output_is_sensitive: nil, retry_whitelist: nil) ⇒ Object
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# File 'lib/krane/kubectl.rb', line 26 def run(*args, log_failure: nil, use_context: true, use_namespace: true, output: nil, raise_if_not_found: false, attempts: 1, output_is_sensitive: nil, retry_whitelist: nil) raise ArgumentError, "namespace is required" if namespace.blank? && use_namespace log_failure = @log_failure_by_default if log_failure.nil? output_is_sensitive = @output_is_sensitive_default if output_is_sensitive.nil? cmd = (args, use_namespace, use_context, output) out, err, st = nil (1..attempts).to_a.each do |current_attempt| logger.debug("Running command (attempt #{current_attempt}): #{cmd.join(' ')}") out, err, st = Open3.capture3(*cmd) logger.debug("Kubectl out: " + out.gsub(/\s+/, ' ')) unless output_is_sensitive break if st.success? raise(ResourceNotFoundError, err) if err.match(ERROR_MATCHERS[:not_found]) && raise_if_not_found if log_failure warning = if current_attempt == attempts "The following command failed (attempt #{current_attempt}/#{attempts})" elsif retriable_err?(err, retry_whitelist) "The following command failed and will be retried (attempt #{current_attempt}/#{attempts})" else "The following command failed and cannot be retried" end logger.warn("#{warning}: #{Shellwords.join(cmd)}") logger.warn(err) unless output_is_sensitive else logger.debug("Kubectl err: #{output_is_sensitive ? '<suppressed sensitive output>' : err}") end StatsD.client.increment('kubectl.error', 1, tags: { context: context, namespace: namespace, cmd: cmd[1] }) break unless retriable_err?(err, retry_whitelist) && current_attempt < attempts sleep(retry_delay(current_attempt)) end [out.chomp, err.chomp, st] end |
#server_dry_run_enabled? ⇒ Boolean
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# File 'lib/krane/kubectl.rb', line 86 def server_dry_run_enabled? server_version >= Gem::Version.new(SERVER_DRY_RUN_MIN_VERSION) end |
#server_version ⇒ Object
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# File 'lib/krane/kubectl.rb', line 82 def server_version version_info[:server] end |
#version_info ⇒ Object
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# File 'lib/krane/kubectl.rb', line 69 def version_info @version_info ||= begin response, _, status = run("version", use_namespace: false, log_failure: true) raise KubectlError, "Could not retrieve kubectl version info" unless status.success? extract_version_info_from_kubectl_response(response) end end |