Class: Gapic::Model::Method::Routing

Inherits:
Object
  • Object
show all
Defined in:
lib/gapic/model/method/routing.rb

Overview

Routing headers info determined from the proto method

Defined Under Namespace

Classes: RoutingParameter

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(routing, http) ⇒ Routing

Returns a new instance of Routing.

Parameters:



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# File 'lib/gapic/model/method/routing.rb', line 34

def initialize routing, http
  @routing = routing
  @http = http
end

Instance Attribute Details

#routing ⇒ ::Google::Api::RoutingRule (readonly)

Returns Explicit routing annotation for the Api.

Returns:



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# File 'lib/gapic/model/method/routing.rb', line 27

class Routing
  attr_reader :routing

  ##
  # @param routing [::Google::Api::RoutingRule] Explict routing annotation for the Api
  # @param http [Gapic::Model::Method::HttpAnnotation] Model for the Http annotation
  #
  def initialize routing, http
    @routing = routing
    @http = http
  end

  ##
  # Whether routing parameters are specified
  #
  # @return [Boolean]
  def routing_params?
    explicit_params? || implicit_params?
  end

  ##
  # Whether an explicit routing annotation (`google.api.routing`) is present
  #
  # @return [Boolean]
  def explicit_annotation?
    !@routing.nil?
  end

  ##
  # Whether an annotation that might contain implicit routing (`google.api.http`) is present
  #
  # @return [Boolean]
  def implicit_annotation?
    !@http.nil?
  end

  ##
  # Whether explicit routing parameters are present
  #
  # @return [Boolean]
  def explicit_params?
    return false unless explicit_annotation?

    explicit_params.any?
  end

  ##
  # Explicit routing parameters, if present.
  # Grouped by the routing key, in order, with the extraction and matching information.
  #
  # @return [Hash<String, Array>]
  def explicit_params
    all_explicit_params.group_by(&:key).transform_values do |params|
      params.sort_by(&:order).to_a
    end
  end

  ##
  # Whether implict routing parameters from `google.api.http` annotation are present
  #
  # @return [Boolean]
  def implicit_params?
    @http.routing_params?
  end

  ##
  # Implicit routing parameters.
  # These strings are both field and routing header key names.
  #
  # @return [Array<String>]
  def implicit_params
    return {} unless implicit_params?
    @http.routing_params
  end

  ##
  # Full routing parameter information, including parsing order
  # and matching/extraction patterns and regexes.
  #
  # @!attribute [r] order
  #   @return [Integer] Order of the parameter in the annotation
  #
  # @!attribute [r] field
  #   @return [String] Field to extract the routing header from
  #
  # @!attribute [r] raw_template
  #   @return [String, nil] Raw template as given in the annotation
  #
  # @!attribute [r] path_template
  #   @return [String] 'Processed' template, handling such cases as
  #      empty or nameless template
  #
  # @!attribute [r] key
  #   @return [String] Name of the key to add to the routing header
  #
  # @!attribute [r] value_pattern
  #   @return [String] The pattern of the value to be extracted
  #
  # @!attribute [r] field_pattern
  #   @return [String] The pattern of the full field (simplified)
  #      The field as a whole should match this pattern
  #      This pattern is simplified, stipped of the names of the
  #      resource id segments.
  #      (e.g. `collections/{resource_id=foo/*}` => `collections/foo/*`)
  #
  # @!attribute [r] field_regex_str
  #   @return [String] The regex matching the `field_pattern`
  #      (the regex form of the simplified pattern)
  #
  # @!attribute [r] field_full_regex_str
  #   @return [String] The regex matching the full unsimplified field pattern
  #      (it will contain the named capture corresponding to the
  #       resource id segment name)
  #
  class RoutingParameter
    attr_reader :order
    attr_reader :field
    attr_reader :raw_template
    attr_reader :path_template
    attr_reader :key
    attr_reader :value_pattern
    attr_reader :field_pattern
    attr_reader :field_regex_str
    attr_reader :field_full_regex_str

    ##
    # @param routing_parameter [::Google::Api::RoutingParameter]
    #   Routing parameter annotation
    #
    # @param order [Integer]
    #   Order of this annotation among its peers
    def initialize routing_parameter, order
      @order = order
      @field = routing_parameter.field
      @raw_template = routing_parameter.path_template
      @path_template = infer_template @raw_template, @field
      @path_pattern = Gapic::PathPattern.parse @path_template

      resource_segment = @path_pattern.segments.find(&:resource_id_segment?)

      # Only one segment providing an argument and only one argument in the segment
      # (no `{foo}~{bar}` segments)
      valid = @path_pattern.segments.count(&:resource_id_segment?) == 1 &&
              resource_segment.arguments.count == 1

      unless valid
        error_text = create_invalid_error_text @path_pattern, @raw_template
        raise ModelError, error_text
      end

      @field_pattern = @path_pattern.simplified_pattern
      @field_full_regex_str =  to_field_pattern @path_pattern
      @field_regex_str = to_field_pattern Gapic::PathPattern.parse(@field_pattern)

      @key = resource_segment.arguments[0]
      @value_pattern = resource_segment.resource_patterns[0]
    end

    ##
    # Whether pattern matching is not needed
    # since the patterns allow all strings
    # @return [Boolean]
    def pattern_matching_not_needed?
      field_pattern == "**" && value_pattern == "**"
    end

    ##
    # Whether the value to be added to the routing header
    # is the value of the whole field
    # @return [Boolean]
    def value_is_full_field?
      @path_pattern.segments.count == 1
    end

    private

    # Makes a regex pattern match a field
    # - adds markers for the beginning and end of the string
    # - adds handling of an optional tail `/` if needed
    # @param pattern [String]
    # @return [String]
    def to_field_pattern pattern
      tail_slash_accept = if pattern.segments.last.simplified_pattern == "**"
                            ""
                          else
                            "/?"
                          end
      "^#{pattern.to_regex_str}#{tail_slash_accept}$"
    end

    # Converts path template simplified forms into canonical
    # ResourceId representations by adding a field as a Resource Id
    # @param template [String]
    # @param field [String]
    # @return [String]
    def infer_template template, field
      if template.nil? || template.empty?
        return "{#{field}=**}"
      end

      if template.strip == "**"
        return "{#{field}=**}"
      end

      if template.strip == "*"
        return "{#{field}=*}"
      end

      template
    end

    def create_invalid_error_text path_pattern, raw_template
      reason = if path_pattern.segments.count(&:resource_id_segment?).zero?
                 "it contains no ResourceId (e.g. `{foo=*}`) segments"
               elsif path_pattern.segments.count(&:resource_id_segment?) > 1
                 "it contains more than one ResourceId (e.g. `{foo=*}`) segments "
               else
                 "it contains a multivariate ResourceId segment (e.g. `{foo}~{bar}`)"
               end

      "A routing header parameter with the path_template #{raw_template}\n " \
          "is invalid: #{reason}"
    end
  end

  private

  # All explicit routing parameters in an array.
  # @return [Array<RoutingParameter>]
  def all_explicit_params
    return [] unless explicit_annotation?
    @routing.routing_parameters.each_with_index.map { |param, index| RoutingParameter.new param, index }.to_a
  end
end

Instance Method Details

#explicit_annotation? ⇒ Boolean

Whether an explicit routing annotation (google.api.routing) is present

Returns:

  • (Boolean) 


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# File 'lib/gapic/model/method/routing.rb', line 51

def explicit_annotation?
  !@routing.nil?
end

#explicit_params ⇒ Hash<String, Array>

Explicit routing parameters, if present. Grouped by the routing key, in order, with the extraction and matching information.

Returns:

  • (Hash<String, Array>) 


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# File 'lib/gapic/model/method/routing.rb', line 78

def explicit_params
  all_explicit_params.group_by(&:key).transform_values do |params|
    params.sort_by(&:order).to_a
  end
end

#explicit_params? ⇒ Boolean

Whether explicit routing parameters are present

Returns:

  • (Boolean) 


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# File 'lib/gapic/model/method/routing.rb', line 67

def explicit_params?
  return false unless explicit_annotation?

  explicit_params.any?
end

#implicit_annotation? ⇒ Boolean

Whether an annotation that might contain implicit routing (google.api.http) is present

Returns:

  • (Boolean) 


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# File 'lib/gapic/model/method/routing.rb', line 59

def implicit_annotation?
  !@http.nil?
end

#implicit_params ⇒ Array<String>

Implicit routing parameters. These strings are both field and routing header key names.

Returns:

  • (Array<String>) 


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# File 'lib/gapic/model/method/routing.rb', line 97

def implicit_params
  return {} unless implicit_params?
  @http.routing_params
end

#implicit_params? ⇒ Boolean

Whether implict routing parameters from google.api.http annotation are present

Returns:

  • (Boolean) 


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# File 'lib/gapic/model/method/routing.rb', line 88

def implicit_params?
  @http.routing_params?
end

#routing_params? ⇒ Boolean

Whether routing parameters are specified

Returns:

  • (Boolean) 


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# File 'lib/gapic/model/method/routing.rb', line 43

def routing_params?
  explicit_params? || implicit_params?
end