// Given a variable definition, and any value of input, return a value which
// adheres to the variable definition, or throw an error.
func getVariableValue(schema Schema, definitionAST *ast.VariableDefinition, input interface{}) (interface{}, error) {
ttype, err := typeFromAST(schema, definitionAST.Type)
if err != nil {
return nil, err
}
variable := definitionAST.Variable
if ttype == nil || !IsInputType(ttype) {
return "", gqlerrors.NewError(
fmt.Sprintf(`Variable "$%v" expected value of type `+
`"%v" which cannot be used as an input type.`, variable.Name.Value, printer.Print(definitionAST.Type)),
[]ast.Node{definitionAST},
"",
nil,
[]int{},
)
}
if isValidInputValue(input, ttype) {
if isNullish(input) {
defaultValue := definitionAST.DefaultValue
if defaultValue != nil {
variables := map[string]interface{}{}
val := valueFromAST(defaultValue, ttype, variables)
return val, nil
}
}
return coerceValue(ttype, input), nil
}
if isNullish(input) {
return "", gqlerrors.NewError(
fmt.Sprintf(`Variable "$%v" of required type `+
`"%v" was not provided.`, variable.Name.Value, printer.Print(definitionAST.Type)),
[]ast.Node{definitionAST},
"",
nil,
[]int{},
)
}
inputStr := ""
b, err := json.Marshal(input)
if err == nil {
inputStr = string(b)
}
return "", gqlerrors.NewError(
fmt.Sprintf(`Variable "$%v" expected value of type `+
`"%v" but got: %v.`, variable.Name.Value, printer.Print(definitionAST.Type), inputStr),
[]ast.Node{definitionAST},
"",
nil,
[]int{},
)
}
func TestPrinter_PrintsMinimalAST(t *testing.T) {
astDoc := ast.NewField(&ast.Field{
Name: ast.NewName(&ast.Name{
Value: "foo",
}),
})
results := printer.Print(astDoc)
expected := "foo"
if !reflect.DeepEqual(results, expected) {
t.Fatalf("Unexpected result, Diff: %v", testutil.Diff(expected, results))
}
}
func TestSchemaPrinter_PrintsMinimalAST(t *testing.T) {
astDoc := ast.NewScalarDefinition(&ast.ScalarDefinition{
Name: ast.NewName(&ast.Name{
Value: "foo",
}),
})
results := printer.Print(astDoc)
expected := "scalar foo"
if !reflect.DeepEqual(results, expected) {
t.Fatalf("Unexpected result, Diff: %v", testutil.Diff(expected, results))
}
}
func TestPrinter_PrintsKitchenSink(t *testing.T) {
b, err := ioutil.ReadFile("../../kitchen-sink.graphql")
if err != nil {
t.Fatalf("unable to load kitchen-sink.graphql")
}
query := string(b)
astDoc := parse(t, query)
expected := `query namedQuery($foo: ComplexFooType, $bar: Bar = DefaultBarValue) {
customUser: user(id: [987, 654]) {
id
... on User @defer {
field2 {
id
alias: field1(first: 10, after: $foo) @include(if: $foo) {
id
...frag
}
}
}
}
}
mutation favPost {
fav(post: 123) @defer {
post {
id
}
}
}
fragment frag on Follower {
foo(size: $size, bar: $b, obj: {key: "value"})
}
{
unnamed(truthyVal: true, falseyVal: false)
query
}
`
results := printer.Print(astDoc)
if !reflect.DeepEqual(expected, results) {
t.Fatalf("Unexpected result, Diff: %v", testutil.Diff(results, expected))
}
}
func TestSchemaPrinter_PrintsKitchenSink(t *testing.T) {
b, err := ioutil.ReadFile("../../schema-kitchen-sink.graphql")
if err != nil {
t.Fatalf("unable to load schema-kitchen-sink.graphql")
}
query := string(b)
astDoc := parse(t, query)
expected := `type Foo implements Bar {
one: Type
two(argument: InputType!): Type
three(argument: InputType, other: String): Int
four(argument: String = "string"): String
five(argument: [String] = ["string", "string"]): String
six(argument: InputType = {key: "value"}): Type
}
interface Bar {
one: Type
four(argument: String = "string"): String
}
union Feed = Story | Article | Advert
scalar CustomScalar
enum Site {
DESKTOP
MOBILE
}
input InputType {
key: String!
answer: Int = 42
}
extend type Foo {
seven(argument: [String]): Type
}
`
results := printer.Print(astDoc)
if !reflect.DeepEqual(expected, results) {
t.Fatalf("Unexpected result, Diff: %v", testutil.Diff(results, expected))
}
}
func TestPrinter_DoesNotAlterAST(t *testing.T) {
b, err := ioutil.ReadFile("../../kitchen-sink.graphql")
if err != nil {
t.Fatalf("unable to load kitchen-sink.graphql")
}
query := string(b)
astDoc := parse(t, query)
astDocBefore := testutil.ASTToJSON(t, astDoc)
_ = printer.Print(astDoc)
astDocAfter := testutil.ASTToJSON(t, astDoc)
_ = testutil.ASTToJSON(t, astDoc)
if !reflect.DeepEqual(astDocAfter, astDocBefore) {
t.Fatalf("Unexpected result, Diff: %v", testutil.Diff(astDocAfter, astDocBefore))
}
}
func init() {
__TypeKind = NewEnum(EnumConfig{
Name: "__TypeKind",
Description: "An enum describing what kind of type a given __Type is",
Values: EnumValueConfigMap{
"SCALAR": &EnumValueConfig{
Value: TypeKindScalar,
Description: "Indicates this type is a scalar.",
},
"OBJECT": &EnumValueConfig{
Value: TypeKindObject,
Description: "Indicates this type is an object. " +
"`fields` and `interfaces` are valid fields.",
},
"INTERFACE": &EnumValueConfig{
Value: TypeKindInterface,
Description: "Indicates this type is an interface. " +
"`fields` and `possibleTypes` are valid fields.",
},
"UNION": &EnumValueConfig{
Value: TypeKindUnion,
Description: "Indicates this type is a union. " +
"`possibleTypes` is a valid field.",
},
"ENUM": &EnumValueConfig{
Value: TypeKindEnum,
Description: "Indicates this type is an enum. " +
"`enumValues` is a valid field.",
},
"INPUT_OBJECT": &EnumValueConfig{
Value: TypeKindInputObject,
Description: "Indicates this type is an input object. " +
"`inputFields` is a valid field.",
},
"LIST": &EnumValueConfig{
Value: TypeKindList,
Description: "Indicates this type is a list. " +
"`ofType` is a valid field.",
},
"NON_NULL": &EnumValueConfig{
Value: TypeKindNonNull,
Description: "Indicates this type is a non-null. " +
"`ofType` is a valid field.",
},
},
})
// Note: some fields (for e.g "fields", "interfaces") are defined later due to cyclic reference
__Type = NewObject(ObjectConfig{
Name: "__Type",
Fields: Fields{
"kind": &Field{
Type: NewNonNull(__TypeKind),
Resolve: func(p ResolveParams) interface{} {
switch p.Source.(type) {
case *Scalar:
return TypeKindScalar
case *Object:
return TypeKindObject
case *Interface:
return TypeKindInterface
case *Union:
return TypeKindUnion
case *Enum:
return TypeKindEnum
case *InputObject:
return TypeKindInputObject
case *List:
return TypeKindList
case *NonNull:
return TypeKindNonNull
}
panic(fmt.Sprintf("Unknown kind of type: %v", p.Source))
},
},
"name": &Field{
Type: String,
},
"description": &Field{
Type: String,
},
"fields": &Field{},
"interfaces": &Field{},
"possibleTypes": &Field{},
"enumValues": &Field{},
"inputFields": &Field{},
"ofType": &Field{},
},
})
__InputValue = NewObject(ObjectConfig{
Name: "__InputValue",
Fields: Fields{
"name": &Field{
Type: NewNonNull(String),
},
"description": &Field{
Type: String,
},
"type": &Field{
Type: NewNonNull(__Type),
},
"defaultValue": &Field{
Type: String,
Resolve: func(p ResolveParams) interface{} {
if inputVal, ok := p.Source.(*Argument); ok {
if inputVal.DefaultValue == nil {
return nil
}
astVal := astFromValue(inputVal.DefaultValue, inputVal)
return printer.Print(astVal)
}
if inputVal, ok := p.Source.(*InputObjectField); ok {
if inputVal.DefaultValue == nil {
return nil
}
astVal := astFromValue(inputVal.DefaultValue, inputVal)
return printer.Print(astVal)
}
return nil
},
},
},
})
__Field = NewObject(ObjectConfig{
Name: "__Field",
Fields: Fields{
"name": &Field{
Type: NewNonNull(String),
},
"description": &Field{
Type: String,
},
"args": &Field{
Type: NewNonNull(NewList(NewNonNull(__InputValue))),
Resolve: func(p ResolveParams) interface{} {
if field, ok := p.Source.(*FieldDefinition); ok {
return field.Args
}
return []interface{}{}
},
},
"type": &Field{
Type: NewNonNull(__Type),
},
"isDeprecated": &Field{
Type: NewNonNull(Boolean),
Resolve: func(p ResolveParams) interface{} {
if field, ok := p.Source.(*FieldDefinition); ok {
return (field.DeprecationReason != "")
}
return false
},
},
"deprecationReason": &Field{
Type: String,
},
},
})
__Directive = NewObject(ObjectConfig{
Name: "__Directive",
Fields: Fields{
"name": &Field{
Type: NewNonNull(String),
},
"description": &Field{
Type: String,
},
"args": &Field{
Type: NewNonNull(NewList(
NewNonNull(__InputValue),
)),
},
"onOperation": &Field{
Type: NewNonNull(Boolean),
},
"onFragment": &Field{
Type: NewNonNull(Boolean),
},
"onField": &Field{
Type: NewNonNull(Boolean),
},
},
})
__Schema = NewObject(ObjectConfig{
Name: "__Schema",
Description: `A GraphQL Schema defines the capabilities of a GraphQL
server. It exposes all available types and directives on
the server, as well as the entry points for query and
mutation operations.`,
Fields: Fields{
"types": &Field{
Description: "A list of all types supported by this server.",
Type: NewNonNull(NewList(
NewNonNull(__Type),
)),
Resolve: func(p ResolveParams) interface{} {
if schema, ok := p.Source.(Schema); ok {
results := []Type{}
for _, ttype := range schema.TypeMap() {
results = append(results, ttype)
}
return results
}
return []Type{}
},
},
"queryType": &Field{
Description: "The type that query operations will be rooted at.",
Type: NewNonNull(__Type),
Resolve: func(p ResolveParams) interface{} {
if schema, ok := p.Source.(Schema); ok {
return schema.QueryType()
}
return nil
},
},
"mutationType": &Field{
Description: `If this server supports mutation, the type that ` +
`mutation operations will be rooted at.`,
Type: __Type,
Resolve: func(p ResolveParams) interface{} {
if schema, ok := p.Source.(Schema); ok {
if schema.MutationType() != nil {
return schema.MutationType()
}
}
return nil
},
},
"directives": &Field{
Description: `A list of all directives supported by this server.`,
Type: NewNonNull(NewList(
NewNonNull(__Directive),
)),
Resolve: func(p ResolveParams) interface{} {
if schema, ok := p.Source.(Schema); ok {
return schema.Directives()
}
return nil
},
},
},
})
__EnumValue = NewObject(ObjectConfig{
Name: "__EnumValue",
Fields: Fields{
"name": &Field{
Type: NewNonNull(String),
},
"description": &Field{
Type: String,
},
"isDeprecated": &Field{
Type: NewNonNull(Boolean),
Resolve: func(p ResolveParams) interface{} {
if field, ok := p.Source.(*EnumValueDefinition); ok {
return (field.DeprecationReason != "")
}
return false
},
},
"deprecationReason": &Field{
Type: String,
},
},
})
// Again, adding field configs to __Type that have cyclic reference here
// because golang don't like them too much during init/compile-time
__Type.AddFieldConfig("fields", &Field{
Type: NewList(NewNonNull(__Field)),
Args: FieldConfigArgument{
"includeDeprecated": &ArgumentConfig{
Type: Boolean,
DefaultValue: false,
},
},
Resolve: func(p ResolveParams) interface{} {
includeDeprecated, _ := p.Args["includeDeprecated"].(bool)
switch ttype := p.Source.(type) {
case *Object:
if ttype == nil {
return nil
}
fields := []*FieldDefinition{}
for _, field := range ttype.Fields() {
if !includeDeprecated && field.DeprecationReason != "" {
continue
}
fields = append(fields, field)
}
return fields
case *Interface:
if ttype == nil {
return nil
}
fields := []*FieldDefinition{}
for _, field := range ttype.Fields() {
if !includeDeprecated && field.DeprecationReason != "" {
continue
}
fields = append(fields, field)
}
return fields
}
return nil
},
})
__Type.AddFieldConfig("interfaces", &Field{
Type: NewList(NewNonNull(__Type)),
Resolve: func(p ResolveParams) interface{} {
switch ttype := p.Source.(type) {
case *Object:
return ttype.Interfaces()
}
return nil
},
})
__Type.AddFieldConfig("possibleTypes", &Field{
Type: NewList(NewNonNull(__Type)),
Resolve: func(p ResolveParams) interface{} {
switch ttype := p.Source.(type) {
case *Interface:
return ttype.PossibleTypes()
case *Union:
return ttype.PossibleTypes()
}
return nil
},
})
__Type.AddFieldConfig("enumValues", &Field{
Type: NewList(NewNonNull(__EnumValue)),
Args: FieldConfigArgument{
"includeDeprecated": &ArgumentConfig{
Type: Boolean,
DefaultValue: false,
},
},
Resolve: func(p ResolveParams) interface{} {
includeDeprecated, _ := p.Args["includeDeprecated"].(bool)
switch ttype := p.Source.(type) {
case *Enum:
if includeDeprecated {
return ttype.Values()
}
values := []*EnumValueDefinition{}
for _, value := range ttype.Values() {
if value.DeprecationReason != "" {
continue
}
values = append(values, value)
}
return values
}
return nil
},
})
__Type.AddFieldConfig("inputFields", &Field{
Type: NewList(NewNonNull(__InputValue)),
Resolve: func(p ResolveParams) interface{} {
switch ttype := p.Source.(type) {
case *InputObject:
fields := []*InputObjectField{}
for _, field := range ttype.Fields() {
fields = append(fields, field)
}
return fields
}
return nil
},
})
__Type.AddFieldConfig("ofType", &Field{
Type: __Type,
})
/**
* Note that these are FieldDefinition and not FieldConfig,
* so the format for args is different.
*/
SchemaMetaFieldDef = &FieldDefinition{
Name: "__schema",
Type: NewNonNull(__Schema),
Description: "Access the current type schema of this server.",
Args: []*Argument{},
Resolve: func(p ResolveParams) interface{} {
return p.Info.Schema
},
}
TypeMetaFieldDef = &FieldDefinition{
Name: "__type",
Type: __Type,
Description: "Request the type information of a single type.",
Args: []*Argument{
&Argument{
PrivateName: "name",
Type: NewNonNull(String),
},
},
Resolve: func(p ResolveParams) interface{} {
name, ok := p.Args["name"].(string)
if !ok {
return nil
}
return p.Info.Schema.Type(name)
},
}
TypeNameMetaFieldDef = &FieldDefinition{
Name: "__typename",
Type: NewNonNull(String),
Description: "The name of the current Object type at runtime.",
Args: []*Argument{},
Resolve: func(p ResolveParams) interface{} {
return p.Info.ParentType.Name()
},
}
}