Class: GraphQL::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/client.rb,
lib/graphql/client/query_result.rb

Defined Under Namespace

Modules: LazyName Classes: Definition, Error, FailedResponse, FragmentDefinition, OperationDefinition, PartialResponse, QueryResult, Response, ResponseError, SuccessfulResponse, ValidationError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(schema: nil, fetch: nil) ⇒ Client

Returns a new instance of Client.



24
25
26
27
28
29
 
# File 'lib/graphql/client.rb', line 24

def initialize(schema: nil, fetch: nil)
  @schema = schema
  @fetch = fetch
  @document = GraphQL::Language::Nodes::Document.new(definitions: [])
  @document_tracking_enabled = false
end

Instance Attribute Details

#document_tracking_enabled ⇒ Object

Returns the value of attribute document_tracking_enabled.



22
23
24
 
# File 'lib/graphql/client.rb', line 22

def document_tracking_enabled
  @document_tracking_enabled
end

#fetch ⇒ Object (readonly)

Returns the value of attribute fetch.



20
21
22
 
# File 'lib/graphql/client.rb', line 20

def fetch
  @fetch
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



20
21
22
 
# File 'lib/graphql/client.rb', line 20

def schema
  @schema
end

Instance Method Details

#document ⇒ Object 



163
164
165
 
# File 'lib/graphql/client.rb', line 163

def document
  @document
end

#parse(str) ⇒ Object 



90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
 
# File 'lib/graphql/client.rb', line 90

def parse(str)
  definition_dependencies = Set.new

  str = str.gsub(/\.\.\.([a-zA-Z0-9_]+(::[a-zA-Z0-9_]+)+)/) { |m|
    const_name = $1
    case fragment = ActiveSupport::Inflector.safe_constantize(const_name)
    when FragmentDefinition
      definition_dependencies.merge(fragment.document.definitions)
      "...#{fragment.definition_name}"
    when nil
      raise NameError, "uninitialized constant #{const_name}\n#{str}"
    else
      raise TypeError, "expected #{const_name} to be a #{FragmentDefinition}, but was a #{fragment.class}"
    end
  }

  doc = GraphQL.parse(str)

  doc.definitions.each do |node|
    node.name ||= "__anonymous__"
  end

  definition_dependencies.merge(doc.definitions)
  document_dependencies = Language::Nodes::Document.new(definitions: definition_dependencies.to_a)

  if @schema
    rules = GraphQL::StaticValidation::ALL_RULES - [GraphQL::StaticValidation::FragmentsAreUsed]
    validator = GraphQL::StaticValidation::Validator.new(schema: @schema, rules: rules)
    query = Query.new(@schema, document: document_dependencies)

    errors = validator.validate(query)
    errors.fetch(:errors).each do |error|
      raise ValidationError, error["message"] + "\n\n" + str
    end
  end

  definitions = {}
  doc.definitions.each do |node|
    node.name = nil if node.name == "__anonymous__"
    sliced_document = Language::OperationSlice.slice(document_dependencies, node.name)
    definition = Definition.for(node: node, document: sliced_document)
    definitions[node.name] = definition
  end

  rename_node = -> (node, parent) {
    if definition = definitions[node.name]
      node.extend(LazyName)
      node.name = -> { definition.definition_name }
    end
  }
  visitor = Language::Visitor.new(doc)
  visitor[Language::Nodes::FragmentDefinition].leave << rename_node
  visitor[Language::Nodes::OperationDefinition].leave << rename_node
  visitor[Language::Nodes::FragmentSpread].leave << rename_node
  visitor.visit

  doc.deep_freeze

  if document_tracking_enabled
    self.document.definitions.concat(doc.definitions)
  end

  if definitions[nil]
    definitions[nil]
  else
    Module.new do
      definitions.each do |name, definition|
        const_set(name, definition)
      end
    end
  end
end

#query(definition, variables: {}) ⇒ Object 



202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
 
# File 'lib/graphql/client.rb', line 202

def query(definition, variables: {})
  unless fetch
    raise Error, "client network fetching not configured"
  end

  document = definition.document
  result = fetch.call(document, variables)
  data, errors, extensions = result.values_at("data", "errors", "extensions")

  if data && errors
    PartialResponse.new(
      data: definition.new(data),
      errors: errors.map { |error| ResponseError.new(definition, error) },
      extensions: extensions
    )
  elsif data && !errors
    SuccessfulResponse.new(
      data: definition.new(data),
      extensions: extensions
    )
  elsif !data && errors
    FailedResponse.new(
      errors: errors.map { |error| ResponseError.new(definition, error) },
      extensions: extensions
    )
  else
    raise Error, "invalid GraphQL response, expected data or errors"
  end
end