Class: GraphQL::Stitching::Request

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/stitching/request.rb

Defined Under Namespace

Classes: ApplyRuntimeDirectives

Constant Summary collapse

SUPPORTED_OPERATIONS = 
["query", "mutation"].freeze
EMPTY_CONTEXT = 
{}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(document, operation_name: nil, variables: nil, context: nil) ⇒ Request

Returns a new instance of Request.



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# File 'lib/graphql/stitching/request.rb', line 59

def initialize(document, operation_name: nil, variables: nil, context: nil)
  @may_contain_runtime_directives = true

  @document = if document.is_a?(String)
    @may_contain_runtime_directives = document.include?("@")
    GraphQL.parse(document)
  else
    document
  end

  @operation_name = operation_name
  @variables = variables || {}
  @context = context || EMPTY_CONTEXT
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/graphql/stitching/request.rb', line 57

def context
  @context
end

#document ⇒ Object (readonly)

Returns the value of attribute document.



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# File 'lib/graphql/stitching/request.rb', line 57

def document
  @document
end

#operation_name ⇒ Object (readonly)

Returns the value of attribute operation_name.



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# File 'lib/graphql/stitching/request.rb', line 57

def operation_name
  @operation_name
end

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



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# File 'lib/graphql/stitching/request.rb', line 57

def variables
  @variables
end

Instance Method Details

#digest ⇒ Object 



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# File 'lib/graphql/stitching/request.rb', line 78

def digest
  @digest ||= Digest::SHA2.hexdigest(string)
end

#fragment_definitions ⇒ Object 



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# File 'lib/graphql/stitching/request.rb', line 106

def fragment_definitions
  @fragment_definitions ||= @document.definitions.each_with_object({}) do |d, memo|
    memo[d.name] = d if d.is_a?(GraphQL::Language::Nodes::FragmentDefinition)
  end
end

#operation ⇒ Object 



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# File 'lib/graphql/stitching/request.rb', line 82

def operation
  @operation ||= begin
    operation_defs = @document.definitions.select do |d|
      next unless d.is_a?(GraphQL::Language::Nodes::OperationDefinition)
      next unless SUPPORTED_OPERATIONS.include?(d.operation_type)
      @operation_name ? d.name == @operation_name : true
    end

    if operation_defs.length < 1
      raise GraphQL::ExecutionError, "Invalid root operation."
    elsif operation_defs.length > 1
      raise GraphQL::ExecutionError, "An operation name is required when sending multiple operations."
    end

    operation_defs.first
  end
end

#prepare! ⇒ Object 



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# File 'lib/graphql/stitching/request.rb', line 112

def prepare!
  operation.variables.each do |v|
    @variables[v.name] ||= v.default_value
  end

  return self unless @may_contain_runtime_directives

  visitor = ApplyRuntimeDirectives.new(@document, @variables)
  @document = visitor.visit

  if visitor.changed?
    @string = nil
    @digest = nil
    @operation = nil
    @variable_definitions = nil
    @fragment_definitions = nil
  end
  self
end

#string ⇒ Object 



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# File 'lib/graphql/stitching/request.rb', line 74

def string
  @string ||= @document.to_query_string
end

#variable_definitions ⇒ Object 



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# File 'lib/graphql/stitching/request.rb', line 100

def variable_definitions
  @variable_definitions ||= operation.variables.each_with_object({}) do |v, memo|
    memo[v.name] = v.type
  end
end