Module: Kubeclient::ClientMixin

Included in:
Client
Defined in:
lib/kubeclient/common.rb

Overview

Common methods this is mixed in by other gems

Constant Summary collapse

ENTITY_METHODS = 
%w[get watch delete create update patch json_patch merge_patch apply].freeze
DEFAULT_SSL_OPTIONS = 
{
  client_cert: nil,
  client_key:  nil,
  ca_file:     nil,
  cert_store:  nil,
  verify_ssl:  OpenSSL::SSL::VERIFY_PEER
}.freeze
DEFAULT_AUTH_OPTIONS = 
{
  username:          nil,
  password:          nil,
  bearer_token:      nil,
  bearer_token_file: nil
}.freeze
DEFAULT_SOCKET_OPTIONS = 
{
  socket_class:     nil,
  ssl_socket_class: nil
}.freeze
DEFAULT_TIMEOUTS = 
{
  # These do NOT affect watch, watching never times out.
  open: Net::HTTP.new('127.0.0.1').open_timeout, # depends on ruby version
  read: Net::HTTP.new('127.0.0.1').read_timeout
}.freeze
DEFAULT_HTTP_PROXY_URI = 
nil
DEFAULT_HTTP_MAX_REDIRECTS = 
10
SEARCH_ARGUMENTS = 
{
  'labelSelector'   => :label_selector,
  'fieldSelector'   => :field_selector,
  'resourceVersion' => :resource_version,
  'limit'           => :limit,
  'continue'        => :continue
}.freeze
WATCH_ARGUMENTS = 
{
  'labelSelector'   => :label_selector,
  'fieldSelector'   => :field_selector,
  'resourceVersion' => :resource_version
}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_sym, *args, &block) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 98

def method_missing(method_sym, *args, &block)
  if discovery_needed?(method_sym)
    discover
    send(method_sym, *args, &block)
  else
    super
  end
end

Instance Attribute Details

#api_endpoint ⇒ Object (readonly)

Returns the value of attribute api_endpoint.



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# File 'lib/kubeclient/common.rb', line 53

def api_endpoint
  @api_endpoint
end

#auth_options ⇒ Object (readonly)

Returns the value of attribute auth_options.



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# File 'lib/kubeclient/common.rb', line 55

def auth_options
  @auth_options
end

#discovered ⇒ Object (readonly)

Returns the value of attribute discovered.



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# File 'lib/kubeclient/common.rb', line 59

def discovered
  @discovered
end

#headers ⇒ Object (readonly)

Returns the value of attribute headers.



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# File 'lib/kubeclient/common.rb', line 58

def headers
  @headers
end

#http_max_redirects ⇒ Object (readonly)

Returns the value of attribute http_max_redirects.



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# File 'lib/kubeclient/common.rb', line 57

def http_max_redirects
  @http_max_redirects
end

#http_proxy_uri ⇒ Object (readonly)

Returns the value of attribute http_proxy_uri.



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# File 'lib/kubeclient/common.rb', line 56

def http_proxy_uri
  @http_proxy_uri
end

#ssl_options ⇒ Object (readonly)

Returns the value of attribute ssl_options.



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# File 'lib/kubeclient/common.rb', line 54

def ssl_options
  @ssl_options
end

Class Method Details

.parse_definition(kind, name) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 139

def self.parse_definition(kind, name)
  # Kubernetes gives us 3 inputs:
  #   kind: "ComponentStatus", "NetworkPolicy", "Endpoints"
  #   name: "componentstatuses", "networkpolicies", "endpoints"
  #   singularName: "componentstatus" etc (usually omitted, defaults to kind.downcase)
  # and want to derive singular and plural method names, with underscores:
  #   "network_policy"
  #   "network_policies"
  # kind's CamelCase word boundaries determine our placement of underscores.

  if IRREGULAR_NAMES[kind]
    # In a few cases, the given kind / singularName itself is still plural.
    # We require a distinct singular method name, so force it.
    method_names = IRREGULAR_NAMES[kind]
  else
    # TODO: respect singularName from discovery?
    # But how?  If it differs from kind.downcase, kind's word boundaries don't apply.
    singular_name = kind.downcase

    if !(/[A-Z]/ =~ kind)
      # Some custom resources have a fully lowercase kind - can't infer underscores.
      method_names = [singular_name, name]
    else
      # Some plurals are not exact suffixes, e.g. NetworkPolicy -> networkpolicies.
      # So don't expect full last word to match.
      /^(?<prefix>(.*[A-Z]))(?<singular_suffix>[^A-Z]*)$/ =~ kind  # "NetworkP", "olicy"
      if name.start_with?(prefix.downcase)
        plural_suffix = name[prefix.length..-1]                    # "olicies"
        prefix_underscores = ClientMixin.underscore_entity(prefix) # "network_p"
        method_names = [prefix_underscores + singular_suffix,      # "network_policy"
                        prefix_underscores + plural_suffix]        # "network_policies"
      else
        method_names = resolve_unconventional_method_names(name, kind, singular_name)
      end
    end
  end

  OpenStruct.new(
    entity_type:   kind,
    resource_name: name,
    method_names:  method_names
  )
end

.resolve_unconventional_method_names(name, kind, singular_name) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 183

def self.resolve_unconventional_method_names(name, kind, singular_name)
  underscored_name = name.tr('-', '_')
  singular_underscores = ClientMixin.underscore_entity(kind)
  if underscored_name.start_with?(singular_underscores)
    [singular_underscores, underscored_name]
  else
    # fallback to lowercase, no separators for both names
    [singular_name, underscored_name.tr('_', '')]
  end
end

.underscore_entity(entity_name) ⇒ Object

rubocop:enable Metrics/BlockLength



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# File 'lib/kubeclient/common.rb', line 277

def self.underscore_entity(entity_name)
  entity_name.gsub(/([a-z])([A-Z])/, '\1_\2').downcase
end

Instance Method Details

#all_entities(options = {}) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 443

def all_entities(options = {})
  discover unless @discovered
  @entities.values.each_with_object({}) do |entity, result_hash|
    # method call for get each entities
    # build hash of entity name to array of the entities
    method_name = "get_#{entity.method_names[1]}"
    begin
      result_hash[entity.method_names[0]] = send(method_name, options)
    rescue Kubeclient::HttpError
      next # do not fail due to resources not supporting get
    end
  end
end

#api ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 521

def api
  response = handle_exception { create_rest_client.get(@headers) }
  JSON.parse(response)
end

#api_valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubeclient/common.rb', line 514

def api_valid?
  result = api
  result.is_a?(Hash) && (result['versions'] || []).any? do |group|
    @api_group.empty? ? group.include?(@api_version) : group['version'] == @api_version
  end
end

#apply_entity(resource_name, resource, field_manager:, force: true) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 430

def apply_entity(resource_name, resource, field_manager:, force: true)
  name = "#{resource[:metadata][:name]}?fieldManager=#{field_manager}&force=#{force}"
  ns_prefix = build_namespace_prefix(resource[:metadata][:namespace])
  response = handle_exception do
    rest_client[ns_prefix + resource_name + "/#{name}"]
      .patch(
        resource.to_json,
        { 'Content-Type' => 'application/apply-patch+yaml' }.merge(@headers)
      )
  end
  format_response(@as, response.body)
end

#build_namespace_prefix(namespace) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 215

def build_namespace_prefix(namespace)
  namespace.to_s.empty? ? '' : "namespaces/#{namespace}/"
end

#create_entity(entity_type, resource_name, entity_config) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 389

def create_entity(entity_type, resource_name, entity_config)
  # Duplicate the entity_config to a hash so that when we assign
  # kind and apiVersion, this does not mutate original entity_config obj.
  hash = entity_config.to_hash

  ns_prefix = build_namespace_prefix(hash[:metadata][:namespace])

  # TODO: temporary solution to add "kind" and apiVersion to request
  # until this issue is solved
  # https://github.com/GoogleCloudPlatform/kubernetes/issues/6439
  hash[:kind] = entity_type
  hash[:apiVersion] = @api_group + @api_version
  response = handle_exception do
    rest_client[ns_prefix + resource_name]
      .post(hash.to_json, { 'Content-Type' => 'application/json' }.merge(@headers))
  end
  format_response(@as, response.body)
end

#create_rest_client(path = nil) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 281

def create_rest_client(path = nil)
  path ||= @api_endpoint.path
  options = {
    ssl_ca_file: @ssl_options[:ca_file],
    ssl_cert_store: @ssl_options[:cert_store],
    verify_ssl: @ssl_options[:verify_ssl],
    ssl_client_cert: @ssl_options[:client_cert],
    ssl_client_key: @ssl_options[:client_key],
    proxy: @http_proxy_uri,
    max_redirects: @http_max_redirects,
    user: @auth_options[:username],
    password: @auth_options[:password],
    open_timeout: @timeouts[:open],
    read_timeout: @timeouts[:read]
  }
  RestClient::Resource.new(@api_endpoint.merge(path).to_s, options)
end

#define_entity_methods ⇒ Object

rubocop:disable Metrics/BlockLength



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# File 'lib/kubeclient/common.rb', line 220

def define_entity_methods
  @entities.values.each do |entity|
    # get all entities of a type e.g. get_nodes, get_pods, etc.
    define_singleton_method("get_#{entity.method_names[1]}") do |options = {}|
      get_entities(entity.entity_type, entity.resource_name, options)
    end

    # watch all entities of a type e.g. watch_nodes, watch_pods, etc.
    define_singleton_method("watch_#{entity.method_names[1]}") do |options = {}, &block|
      # This method used to take resource_version as a param, so
      # this conversion is to keep backwards compatibility
      options = { resource_version: options } unless options.is_a?(Hash)

      watch_entities(entity.resource_name, options, &block)
    end

    # get a single entity of a specific type by name
    define_singleton_method("get_#{entity.method_names[0]}") \
    do |name, namespace = nil, opts = {}|
      get_entity(entity.resource_name, name, namespace, opts)
    end

    define_singleton_method("delete_#{entity.method_names[0]}") \
    do |name, namespace = nil, opts = {}|
      delete_entity(entity.resource_name, name, namespace, **opts)
    end

    define_singleton_method("create_#{entity.method_names[0]}") do |entity_config|
      create_entity(entity.entity_type, entity.resource_name, entity_config)
    end

    define_singleton_method("update_#{entity.method_names[0]}") do |entity_config|
      update_entity(entity.resource_name, entity_config)
    end

    define_singleton_method("patch_#{entity.method_names[0]}") \
    do |name, patch, namespace = nil|
      patch_entity(entity.resource_name, name, patch, 'strategic-merge-patch', namespace)
    end

    define_singleton_method("json_patch_#{entity.method_names[0]}") \
    do |name, patch, namespace = nil|
      patch_entity(entity.resource_name, name, patch, 'json-patch', namespace)
    end

    define_singleton_method("merge_patch_#{entity.method_names[0]}") \
    do |name, patch, namespace = nil|
      patch_entity(entity.resource_name, name, patch, 'merge-patch', namespace)
    end

    define_singleton_method("apply_#{entity.method_names[0]}") do |resource, opts = {}|
      apply_entity(entity.resource_name, resource, **opts)
    end
  end
end

#delete_entity(resource_name, name, namespace = nil, delete_options: {}) ⇒ Object

delete_options are passed as a JSON payload in the delete request



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# File 'lib/kubeclient/common.rb', line 371

def delete_entity(resource_name, name, namespace = nil, delete_options: {})
  delete_options_hash = delete_options.to_hash
  ns_prefix = build_namespace_prefix(namespace)
  payload = delete_options_hash.to_json unless delete_options_hash.empty?
  response = handle_exception do
    rs = rest_client[ns_prefix + resource_name + "/#{name}"]
    RestClient::Request.execute(
      rs.options.merge(
        method: :delete,
        url: rs.url,
        headers: { 'Content-Type' => 'application/json' }.merge(@headers),
        payload: payload
      )
    )
  end
  format_response(@as, response.body)
end

#discover ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 133

def discover
  load_entities
  define_entity_methods
  @discovered = true
end

#discovery_needed?(method_sym) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubeclient/common.rb', line 116

def discovery_needed?(method_sym)
  !@discovered && ENTITY_METHODS.any? { |x| method_sym.to_s.start_with?(x) }
end

#get_entities(entity_type, resource_name, options = {}) ⇒ Object

Accepts the following options:

:namespace (string) - the namespace of the entity.
:label_selector (string) - a selector to restrict the list of returned objects by labels.
:field_selector (string) - a selector to restrict the list of returned objects by fields.
:limit (integer) - a maximum number of items to return in each response
:continue (string) - a token used to retrieve the next chunk of entities
:as (:raw|:ros) - defaults to :ros
  :raw - return the raw response body as a string
  :ros - return a collection of RecursiveOpenStruct objects



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# File 'lib/kubeclient/common.rb', line 345

def get_entities(entity_type, resource_name, options = {})
  params = {}
  SEARCH_ARGUMENTS.each { |k, v| params[k] = options[v] if options[v] }

  ns_prefix = build_namespace_prefix(options[:namespace])
  response = handle_exception do
    rest_client[ns_prefix + resource_name]
      .get({ 'params' => params }.merge(@headers))
  end
  format_response(options[:as] || @as, response.body, entity_type)
end

#get_entity(resource_name, name, namespace = nil, options = {}) ⇒ Object

Accepts the following options:

:as (:raw|:ros) - defaults to :ros
  :raw - return the raw response body as a string
  :ros - return a collection of RecursiveOpenStruct objects



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# File 'lib/kubeclient/common.rb', line 361

def get_entity(resource_name, name, namespace = nil, options = {})
  ns_prefix = build_namespace_prefix(namespace)
  response = handle_exception do
    rest_client[ns_prefix + resource_name + "/#{name}"]
      .get(@headers)
  end
  format_response(options[:as] || @as, response.body)
end

#get_pod_log(pod_name, namespace, container: nil, previous: false, timestamps: false, since_time: nil, tail_lines: nil, limit_bytes: nil) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 457

def get_pod_log(pod_name, namespace,
                container: nil, previous: false,
                timestamps: false, since_time: nil, tail_lines: nil, limit_bytes: nil)
  params = {}
  params[:previous] = true if previous
  params[:container] = container if container
  params[:timestamps] = timestamps if timestamps
  params[:sinceTime] = format_datetime(since_time) if since_time
  params[:tailLines] = tail_lines if tail_lines
  params[:limitBytes] = limit_bytes if limit_bytes

  ns = build_namespace_prefix(namespace)
  handle_exception do
    rest_client[ns + "pods/#{pod_name}/log"]
      .get({ 'params' => params }.merge(@headers))
  end
end

#handle_exception ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 120

def handle_exception
  yield
rescue RestClient::Exception => e
  json_error_msg = begin
    JSON.parse(e.response || '') || {}
  rescue JSON::ParserError
    {}
  end
  err_message = json_error_msg['message'] || e.message
  error_klass = e.http_code == 404 ? ResourceNotFoundError : HttpError
  raise error_klass.new(e.http_code, err_message, e.response)
end

#handle_uri(uri, path) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/kubeclient/common.rb', line 194

def handle_uri(uri, path)
  raise ArgumentError, 'Missing uri' unless uri
  @api_endpoint = (uri.is_a?(URI) ? uri : URI.parse(uri))

  # This regex will anchor at the last `/api`, `/oapi` or`/apis/:group`) part of the URL
  # The whole path will be matched and if existing, the api_group will be extracted.
  re = /^(?<path>.*\/o?api(?:s\/(?<apigroup>[^\/]+))?)$/mi
  match = re.match(@api_endpoint.path.chomp('/'))

  if match
    # Since `re` captures 2 groups, match will always have 3 elements
    # If thus we have a non-nil value in match 2, this is our api_group.
    @api_group = match[:apigroup].nil? ? '' : match[:apigroup] + '/'
    @api_endpoint.path = match[:path]
  else
    # This is a fallback, for when `/api` was not provided as part of the uri
    @api_group = ''
    @api_endpoint.path = @api_endpoint.path.chomp('/') + path
  end
end

#initialize_client(uri, path, version, ssl_options: DEFAULT_SSL_OPTIONS, auth_options: DEFAULT_AUTH_OPTIONS, socket_options: DEFAULT_SOCKET_OPTIONS, timeouts: DEFAULT_TIMEOUTS, http_proxy_uri: DEFAULT_HTTP_PROXY_URI, http_max_redirects: DEFAULT_HTTP_MAX_REDIRECTS, as: :ros) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 61

def initialize_client(
  uri,
  path,
  version,
  ssl_options: DEFAULT_SSL_OPTIONS,
  auth_options: DEFAULT_AUTH_OPTIONS,
  socket_options: DEFAULT_SOCKET_OPTIONS,
  timeouts: DEFAULT_TIMEOUTS,
  http_proxy_uri: DEFAULT_HTTP_PROXY_URI,
  http_max_redirects: DEFAULT_HTTP_MAX_REDIRECTS,
  as: :ros
)
  validate_auth_options(auth_options)
  handle_uri(uri, path)

  @entities = {}
  @discovered = false
  @api_version = version
  @headers = {}
  @ssl_options = ssl_options
  @auth_options = auth_options
  @socket_options = socket_options
  # Allow passing partial timeouts hash, without unspecified
  # @timeouts[:foo] == nil resulting in infinite timeout.
  @timeouts = DEFAULT_TIMEOUTS.merge(timeouts)
  @http_proxy_uri = http_proxy_uri ? http_proxy_uri.to_s : nil
  @http_max_redirects = http_max_redirects
  @as = as

  if auth_options[:bearer_token]
    bearer_token(@auth_options[:bearer_token])
  elsif auth_options[:bearer_token_file]
    validate_bearer_token_file
    bearer_token(File.read(@auth_options[:bearer_token_file]))
  end
end

#patch_entity(resource_name, name, patch, strategy, namespace) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 418

def patch_entity(resource_name, name, patch, strategy, namespace)
  ns_prefix = build_namespace_prefix(namespace)
  response = handle_exception do
    rest_client[ns_prefix + resource_name + "/#{name}"]
      .patch(
        patch.to_json,
        { 'Content-Type' => "application/#{strategy}+json" }.merge(@headers)
      )
  end
  format_response(@as, response.body)
end

#process_template(template) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 505

def process_template(template)
  ns_prefix = build_namespace_prefix(template[:metadata][:namespace])
  response = handle_exception do
    rest_client[ns_prefix + 'processedtemplates']
      .post(template.to_h.to_json, { 'Content-Type' => 'application/json' }.merge(@headers))
  end
  JSON.parse(response)
end

#proxy_url(kind, name, port, namespace = '') ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 493

def proxy_url(kind, name, port, namespace = '')
  discover unless @discovered
  entity_name_plural =
    if %w[services pods nodes].include?(kind.to_s)
      kind.to_s
    else
      @entities[kind.to_s].resource_name
    end
  ns_prefix = build_namespace_prefix(namespace)
  rest_client["#{ns_prefix}#{entity_name_plural}/#{name}:#{port}/proxy"].url
end

#respond_to_missing?(method_sym, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/kubeclient/common.rb', line 107

def respond_to_missing?(method_sym, include_private = false)
  if discovery_needed?(method_sym)
    discover
    respond_to?(method_sym, include_private)
  else
    super
  end
end

#rest_client ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 299

def rest_client
  @rest_client ||= begin
    create_rest_client("#{@api_endpoint.path}/#{@api_version}")
  end
end

#update_entity(resource_name, entity_config) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 408

def update_entity(resource_name, entity_config)
  name      = entity_config[:metadata][:name]
  ns_prefix = build_namespace_prefix(entity_config[:metadata][:namespace])
  response = handle_exception do
    rest_client[ns_prefix + resource_name + "/#{name}"]
      .put(entity_config.to_h.to_json, { 'Content-Type' => 'application/json' }.merge(@headers))
  end
  format_response(@as, response.body)
end

#watch_entities(resource_name, options = {}, &block) ⇒ Object

Accepts the following options:

:namespace (string) - the namespace of the entity.
:name (string) - the name of the entity to watch.
:label_selector (string) - a selector to restrict the list of returned objects by labels.
:field_selector (string) - a selector to restrict the list of returned objects by fields.
:resource_version (string) - shows changes that occur after passed version of a resource.
:as (:raw|:ros) - defaults to :ros
  :raw - return the raw response body as a string
  :ros - return a collection of RecursiveOpenStruct objects

Accepts an optional block, that will be called with each entity, otherwise returns a WatchStream



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# File 'lib/kubeclient/common.rb', line 316

def watch_entities(resource_name, options = {}, &block)
  ns = build_namespace_prefix(options[:namespace])

  path = "watch/#{ns}#{resource_name}"
  path += "/#{options[:name]}" if options[:name]
  uri = @api_endpoint.merge("#{@api_endpoint.path}/#{@api_version}/#{path}")

  params = {}
  WATCH_ARGUMENTS.each { |k, v| params[k] = options[v] if options[v] }
  uri.query = URI.encode_www_form(params) if params.any?

  watcher = Kubeclient::Common::WatchStream.new(
    uri,
    http_options(uri),
    formatter: ->(value) { format_response(options[:as] || @as, value) }
  )

  return_or_yield_to_watcher(watcher, &block)
end

#watch_pod_log(pod_name, namespace, container: nil, &block) ⇒ Object 



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# File 'lib/kubeclient/common.rb', line 475

def watch_pod_log(pod_name, namespace, container: nil, &block)
  # Adding the "follow=true" query param tells the Kubernetes API to keep
  # the connection open and stream updates to the log.
  params = { follow: true }
  params[:container] = container if container

  ns = build_namespace_prefix(namespace)

  uri = @api_endpoint.dup
  uri.path += "/#{@api_version}/#{ns}pods/#{pod_name}/log"
  uri.query = URI.encode_www_form(params)

  watcher = Kubeclient::Common::WatchStream.new(
    uri, http_options(uri), formatter: ->(value) { value }
  )
  return_or_yield_to_watcher(watcher, &block)
end