Class: GraphQL::Stitching::Executor::RootSource

Inherits:
Dataloader::Source
  • Object
show all
Includes:
PathAccess
Defined in:
lib/graphql/stitching/executor/root_source.rb

Instance Method Summary collapse

Constructor Details

#initialize(executor, location) ⇒ RootSource

Returns a new instance of RootSource.



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# File 'lib/graphql/stitching/executor/root_source.rb', line 8

def initialize(executor, location)
  @executor = executor
  @location = location
end

Instance Method Details

#build_document(op, operation_name = nil, operation_directives = nil) ⇒ Object

Builds root source documents "query MyOperation_1($var:VarType) { rootSelections ... }"



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# File 'lib/graphql/stitching/executor/root_source.rb', line 53

def build_document(op, operation_name = nil, operation_directives = nil)
  doc_buffer = String.new
  doc_buffer << op.operation_type

  if operation_name
    doc_buffer << " " << operation_name << "_" << op.step.to_s
  end

  unless op.variables.empty?
    doc_buffer << "("
    op.variables.each_with_index do |(k, v), i|
      doc_buffer << "," unless i.zero?
      doc_buffer << "$" << k << ":" << v
    end
    doc_buffer << ")"
  end

  if operation_directives
    doc_buffer << " " << operation_directives << " "
  end

  doc_buffer << op.selections
  doc_buffer
end

#fetch(ops) ⇒ Object 



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# File 'lib/graphql/stitching/executor/root_source.rb', line 13

def fetch(ops)
  ops.map do |op|
    origin_set = op.path.empty? ? [@executor.data] : path_objects(@executor.data, op.path)

    query_document = build_document(
      op,
      @executor.request.operation_name,
      @executor.request.operation_directives,
    )
    query_variables = @executor.request.variables.slice(*op.variables.each_key)
    result = @executor.request.supergraph.execute_at_location(op.location, query_document, query_variables, @executor.request)
    @executor.query_count += 1

    errors = result["errors"]
    origin_entries = nil

    if errors && !errors.empty?
      origin_entries = op.path.empty? ? [[@executor.data, []]] : path_entries(@executor.data, op.path)
    end

    if result["data"]
      if op.path.empty?
        # Actual root scopes merge directly into results data
        @executor.data.merge!(result["data"])
      elsif !origin_set.empty?
        # Nested root scopes merge the same root payload into each pathed origin
        origin_set.each { |origin_obj| origin_obj.merge!(result["data"]) }
      end
    end

    if errors && !errors.empty?
      @executor.errors.concat(format_errors(errors, origin_entries, op.path))
    end

    op.step
  end
end

#format_errors(errors, origin_entries, fallback_path = []) ⇒ Object

Format response errors without a document location (because it won't match the request doc), and prepend all concrete insertion paths for nested scopes into error paths.



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# File 'lib/graphql/stitching/executor/root_source.rb', line 80

def format_errors(errors, origin_entries, fallback_path = [])
  errors.flat_map do |err|
    path = err["path"]

    if path && !origin_entries.empty?
      origin_entries.map do |_origin_obj, origin_path|
        sanitized_error(err, path: origin_path + path)
      end
    elsif path && !fallback_path.empty?
      sanitized_error(err, path: fallback_path + path)
    else
      sanitized_error(err)
    end
  end
end