graphql: update gqlgen to 0.5.1

fix #6

19 files changed, 1121 insertions, 0 deletions

diff --git a/vendor/github.com/99designs/gqlgen/graphql/bool.go b/vendor/github.com/99designs/gqlgen/graphql/bool.go
new file mode 100644
index 00000000..7053bbca
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/bool.go
@@ -0,0 +1,30 @@
+package graphql
+
+import (
+	"fmt"
+	"io"
+	"strings"
+)
+
+func MarshalBoolean(b bool) Marshaler {
+	return WriterFunc(func(w io.Writer) {
+		if b {
+			w.Write(trueLit)
+		} else {
+			w.Write(falseLit)
+		}
+	})
+}
+
+func UnmarshalBoolean(v interface{}) (bool, error) {
+	switch v := v.(type) {
+	case string:
+		return "true" == strings.ToLower(v), nil
+	case int:
+		return v != 0, nil
+	case bool:
+		return v, nil
+	default:
+		return false, fmt.Errorf("%T is not a bool", v)
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/context.go b/vendor/github.com/99designs/gqlgen/graphql/context.go
new file mode 100644
index 00000000..6baee83c
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/context.go
@@ -0,0 +1,178 @@
+package graphql
+
+import (
+	"context"
+	"fmt"
+	"sync"
+
+	"github.com/vektah/gqlparser/ast"
+	"github.com/vektah/gqlparser/gqlerror"
+)
+
+type Resolver func(ctx context.Context) (res interface{}, err error)
+type FieldMiddleware func(ctx context.Context, next Resolver) (res interface{}, err error)
+type RequestMiddleware func(ctx context.Context, next func(ctx context.Context) []byte) []byte
+
+type RequestContext struct {
+	RawQuery  string
+	Variables map[string]interface{}
+	Doc       *ast.QueryDocument
+	// ErrorPresenter will be used to generate the error
+	// message from errors given to Error().
+	ErrorPresenter      ErrorPresenterFunc
+	Recover             RecoverFunc
+	ResolverMiddleware  FieldMiddleware
+	DirectiveMiddleware FieldMiddleware
+	RequestMiddleware   RequestMiddleware
+
+	errorsMu sync.Mutex
+	Errors   gqlerror.List
+}
+
+func DefaultResolverMiddleware(ctx context.Context, next Resolver) (res interface{}, err error) {
+	return next(ctx)
+}
+
+func DefaultDirectiveMiddleware(ctx context.Context, next Resolver) (res interface{}, err error) {
+	return next(ctx)
+}
+
+func DefaultRequestMiddleware(ctx context.Context, next func(ctx context.Context) []byte) []byte {
+	return next(ctx)
+}
+
+func NewRequestContext(doc *ast.QueryDocument, query string, variables map[string]interface{}) *RequestContext {
+	return &RequestContext{
+		Doc:                 doc,
+		RawQuery:            query,
+		Variables:           variables,
+		ResolverMiddleware:  DefaultResolverMiddleware,
+		DirectiveMiddleware: DefaultDirectiveMiddleware,
+		RequestMiddleware:   DefaultRequestMiddleware,
+		Recover:             DefaultRecover,
+		ErrorPresenter:      DefaultErrorPresenter,
+	}
+}
+
+type key string
+
+const (
+	request  key = "request_context"
+	resolver key = "resolver_context"
+)
+
+func GetRequestContext(ctx context.Context) *RequestContext {
+	val := ctx.Value(request)
+	if val == nil {
+		return nil
+	}
+
+	return val.(*RequestContext)
+}
+
+func WithRequestContext(ctx context.Context, rc *RequestContext) context.Context {
+	return context.WithValue(ctx, request, rc)
+}
+
+type ResolverContext struct {
+	Parent *ResolverContext
+	// The name of the type this field belongs to
+	Object string
+	// These are the args after processing, they can be mutated in middleware to change what the resolver will get.
+	Args map[string]interface{}
+	// The raw field
+	Field CollectedField
+	// The index of array in path.
+	Index *int
+	// The result object of resolver
+	Result interface{}
+}
+
+func (r *ResolverContext) Path() []interface{} {
+	var path []interface{}
+	for it := r; it != nil; it = it.Parent {
+		if it.Index != nil {
+			path = append(path, *it.Index)
+		} else if it.Field.Field != nil {
+			path = append(path, it.Field.Alias)
+		}
+	}
+
+	// because we are walking up the chain, all the elements are backwards, do an inplace flip.
+	for i := len(path)/2 - 1; i >= 0; i-- {
+		opp := len(path) - 1 - i
+		path[i], path[opp] = path[opp], path[i]
+	}
+
+	return path
+}
+
+func GetResolverContext(ctx context.Context) *ResolverContext {
+	val, _ := ctx.Value(resolver).(*ResolverContext)
+	return val
+}
+
+func WithResolverContext(ctx context.Context, rc *ResolverContext) context.Context {
+	rc.Parent = GetResolverContext(ctx)
+	return context.WithValue(ctx, resolver, rc)
+}
+
+// This is just a convenient wrapper method for CollectFields
+func CollectFieldsCtx(ctx context.Context, satisfies []string) []CollectedField {
+	resctx := GetResolverContext(ctx)
+	return CollectFields(ctx, resctx.Field.Selections, satisfies)
+}
+
+// Errorf sends an error string to the client, passing it through the formatter.
+func (c *RequestContext) Errorf(ctx context.Context, format string, args ...interface{}) {
+	c.errorsMu.Lock()
+	defer c.errorsMu.Unlock()
+
+	c.Errors = append(c.Errors, c.ErrorPresenter(ctx, fmt.Errorf(format, args...)))
+}
+
+// Error sends an error to the client, passing it through the formatter.
+func (c *RequestContext) Error(ctx context.Context, err error) {
+	c.errorsMu.Lock()
+	defer c.errorsMu.Unlock()
+
+	c.Errors = append(c.Errors, c.ErrorPresenter(ctx, err))
+}
+
+// HasError returns true if the current field has already errored
+func (c *RequestContext) HasError(rctx *ResolverContext) bool {
+	c.errorsMu.Lock()
+	defer c.errorsMu.Unlock()
+	path := rctx.Path()
+
+	for _, err := range c.Errors {
+		if equalPath(err.Path, path) {
+			return true
+		}
+	}
+	return false
+}
+
+func equalPath(a []interface{}, b []interface{}) bool {
+	if len(a) != len(b) {
+		return false
+	}
+
+	for i := 0; i < len(a); i++ {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+
+	return true
+}
+
+// AddError is a convenience method for adding an error to the current response
+func AddError(ctx context.Context, err error) {
+	GetRequestContext(ctx).Error(ctx, err)
+}
+
+// AddErrorf is a convenience method for adding an error to the current response
+func AddErrorf(ctx context.Context, format string, args ...interface{}) {
+	GetRequestContext(ctx).Errorf(ctx, format, args...)
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/error.go b/vendor/github.com/99designs/gqlgen/graphql/error.go
new file mode 100644
index 00000000..7f161a43
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/error.go
@@ -0,0 +1,31 @@
+package graphql
+
+import (
+	"context"
+
+	"github.com/vektah/gqlparser/gqlerror"
+)
+
+type ErrorPresenterFunc func(context.Context, error) *gqlerror.Error
+
+type ExtendedError interface {
+	Extensions() map[string]interface{}
+}
+
+func DefaultErrorPresenter(ctx context.Context, err error) *gqlerror.Error {
+	if gqlerr, ok := err.(*gqlerror.Error); ok {
+		gqlerr.Path = GetResolverContext(ctx).Path()
+		return gqlerr
+	}
+
+	var extensions map[string]interface{}
+	if ee, ok := err.(ExtendedError); ok {
+		extensions = ee.Extensions()
+	}
+
+	return &gqlerror.Error{
+		Message:    err.Error(),
+		Path:       GetResolverContext(ctx).Path(),
+		Extensions: extensions,
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/exec.go b/vendor/github.com/99designs/gqlgen/graphql/exec.go
new file mode 100644
index 00000000..9beb3149
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/exec.go
@@ -0,0 +1,135 @@
+package graphql
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/vektah/gqlparser/ast"
+)
+
+type ExecutableSchema interface {
+	Schema() *ast.Schema
+
+	Complexity(typeName, fieldName string, childComplexity int, args map[string]interface{}) (int, bool)
+	Query(ctx context.Context, op *ast.OperationDefinition) *Response
+	Mutation(ctx context.Context, op *ast.OperationDefinition) *Response
+	Subscription(ctx context.Context, op *ast.OperationDefinition) func() *Response
+}
+
+func CollectFields(ctx context.Context, selSet ast.SelectionSet, satisfies []string) []CollectedField {
+	return collectFields(GetRequestContext(ctx), selSet, satisfies, map[string]bool{})
+}
+
+func collectFields(reqCtx *RequestContext, selSet ast.SelectionSet, satisfies []string, visited map[string]bool) []CollectedField {
+	var groupedFields []CollectedField
+
+	for _, sel := range selSet {
+		switch sel := sel.(type) {
+		case *ast.Field:
+			if !shouldIncludeNode(sel.Directives, reqCtx.Variables) {
+				continue
+			}
+			f := getOrCreateField(&groupedFields, sel.Alias, func() CollectedField {
+				return CollectedField{Field: sel}
+			})
+
+			f.Selections = append(f.Selections, sel.SelectionSet...)
+		case *ast.InlineFragment:
+			if !shouldIncludeNode(sel.Directives, reqCtx.Variables) || !instanceOf(sel.TypeCondition, satisfies) {
+				continue
+			}
+			for _, childField := range collectFields(reqCtx, sel.SelectionSet, satisfies, visited) {
+				f := getOrCreateField(&groupedFields, childField.Name, func() CollectedField { return childField })
+				f.Selections = append(f.Selections, childField.Selections...)
+			}
+
+		case *ast.FragmentSpread:
+			if !shouldIncludeNode(sel.Directives, reqCtx.Variables) {
+				continue
+			}
+			fragmentName := sel.Name
+			if _, seen := visited[fragmentName]; seen {
+				continue
+			}
+			visited[fragmentName] = true
+
+			fragment := reqCtx.Doc.Fragments.ForName(fragmentName)
+			if fragment == nil {
+				// should never happen, validator has already run
+				panic(fmt.Errorf("missing fragment %s", fragmentName))
+			}
+
+			if !instanceOf(fragment.TypeCondition, satisfies) {
+				continue
+			}
+
+			for _, childField := range collectFields(reqCtx, fragment.SelectionSet, satisfies, visited) {
+				f := getOrCreateField(&groupedFields, childField.Name, func() CollectedField { return childField })
+				f.Selections = append(f.Selections, childField.Selections...)
+			}
+
+		default:
+			panic(fmt.Errorf("unsupported %T", sel))
+		}
+	}
+
+	return groupedFields
+}
+
+type CollectedField struct {
+	*ast.Field
+
+	Selections ast.SelectionSet
+}
+
+func instanceOf(val string, satisfies []string) bool {
+	for _, s := range satisfies {
+		if val == s {
+			return true
+		}
+	}
+	return false
+}
+
+func getOrCreateField(c *[]CollectedField, name string, creator func() CollectedField) *CollectedField {
+	for i, cf := range *c {
+		if cf.Alias == name {
+			return &(*c)[i]
+		}
+	}
+
+	f := creator()
+
+	*c = append(*c, f)
+	return &(*c)[len(*c)-1]
+}
+
+func shouldIncludeNode(directives ast.DirectiveList, variables map[string]interface{}) bool {
+	skip, include := false, true
+
+	if d := directives.ForName("skip"); d != nil {
+		skip = resolveIfArgument(d, variables)
+	}
+
+	if d := directives.ForName("include"); d != nil {
+		include = resolveIfArgument(d, variables)
+	}
+
+	return !skip && include
+}
+
+func resolveIfArgument(d *ast.Directive, variables map[string]interface{}) bool {
+	arg := d.Arguments.ForName("if")
+	if arg == nil {
+		panic(fmt.Sprintf("%s: argument 'if' not defined", d.Name))
+	}
+	value, err := arg.Value.Value(variables)
+	if err != nil {
+		panic(err)
+	}
+	ret, ok := value.(bool)
+	if !ok {
+		panic(fmt.Sprintf("%s: argument 'if' is not a boolean", d.Name))
+	}
+	return ret
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/float.go b/vendor/github.com/99designs/gqlgen/graphql/float.go
new file mode 100644
index 00000000..d204335c
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/float.go
@@ -0,0 +1,31 @@
+package graphql
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"strconv"
+)
+
+func MarshalFloat(f float64) Marshaler {
+	return WriterFunc(func(w io.Writer) {
+		io.WriteString(w, fmt.Sprintf("%f", f))
+	})
+}
+
+func UnmarshalFloat(v interface{}) (float64, error) {
+	switch v := v.(type) {
+	case string:
+		return strconv.ParseFloat(v, 64)
+	case int:
+		return float64(v), nil
+	case int64:
+		return float64(v), nil
+	case float64:
+		return v, nil
+	case json.Number:
+		return strconv.ParseFloat(string(v), 64)
+	default:
+		return 0, fmt.Errorf("%T is not an float", v)
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/id.go b/vendor/github.com/99designs/gqlgen/graphql/id.go
new file mode 100644
index 00000000..a5a7960f
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/id.go
@@ -0,0 +1,36 @@
+package graphql
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"strconv"
+)
+
+func MarshalID(s string) Marshaler {
+	return WriterFunc(func(w io.Writer) {
+		io.WriteString(w, strconv.Quote(s))
+	})
+}
+func UnmarshalID(v interface{}) (string, error) {
+	switch v := v.(type) {
+	case string:
+		return v, nil
+	case json.Number:
+		return string(v), nil
+	case int:
+		return strconv.Itoa(v), nil
+	case float64:
+		return fmt.Sprintf("%f", v), nil
+	case bool:
+		if v {
+			return "true", nil
+		} else {
+			return "false", nil
+		}
+	case nil:
+		return "null", nil
+	default:
+		return "", fmt.Errorf("%T is not a string", v)
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/int.go b/vendor/github.com/99designs/gqlgen/graphql/int.go
new file mode 100644
index 00000000..ff87574c
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/int.go
@@ -0,0 +1,29 @@
+package graphql
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"strconv"
+)
+
+func MarshalInt(i int) Marshaler {
+	return WriterFunc(func(w io.Writer) {
+		io.WriteString(w, strconv.Itoa(i))
+	})
+}
+
+func UnmarshalInt(v interface{}) (int, error) {
+	switch v := v.(type) {
+	case string:
+		return strconv.Atoi(v)
+	case int:
+		return v, nil
+	case int64:
+		return int(v), nil
+	case json.Number:
+		return strconv.Atoi(string(v))
+	default:
+		return 0, fmt.Errorf("%T is not an int", v)
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/introspection/introspection.go b/vendor/github.com/99designs/gqlgen/graphql/introspection/introspection.go
new file mode 100644
index 00000000..baff882e
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/introspection/introspection.go
@@ -0,0 +1,58 @@
+// introspection implements the spec defined in https://github.com/facebook/graphql/blob/master/spec/Section%204%20--%20Introspection.md#schema-introspection
+package introspection
+
+import "github.com/vektah/gqlparser/ast"
+
+type (
+	Directive struct {
+		Name        string
+		Description string
+		Locations   []string
+		Args        []InputValue
+	}
+
+	EnumValue struct {
+		Name              string
+		Description       string
+		IsDeprecated      bool
+		DeprecationReason string
+	}
+
+	Field struct {
+		Name              string
+		Description       string
+		Type              *Type
+		Args              []InputValue
+		IsDeprecated      bool
+		DeprecationReason string
+	}
+
+	InputValue struct {
+		Name         string
+		Description  string
+		DefaultValue *string
+		Type         *Type
+	}
+)
+
+func WrapSchema(schema *ast.Schema) *Schema {
+	return &Schema{schema: schema}
+}
+
+func isDeprecated(directives ast.DirectiveList) bool {
+	return directives.ForName("deprecated") != nil
+}
+
+func deprecationReason(directives ast.DirectiveList) string {
+	deprecation := directives.ForName("deprecated")
+	if deprecation == nil {
+		return ""
+	}
+
+	reason := deprecation.Arguments.ForName("reason")
+	if reason == nil {
+		return ""
+	}
+
+	return reason.Value.Raw
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/introspection/query.go b/vendor/github.com/99designs/gqlgen/graphql/introspection/query.go
new file mode 100644
index 00000000..b1e4fbc6
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/introspection/query.go
@@ -0,0 +1,104 @@
+package introspection
+
+// Query is the query generated by graphiql to determine type information
+const Query = `
+query IntrospectionQuery {
+  __schema {
+    queryType {
+      name
+    }
+    mutationType {
+      name
+    }
+    subscriptionType {
+      name
+    }
+    types {
+      ...FullType
+    }
+    directives {
+      name
+      description
+      locations
+      args {
+        ...InputValue
+      }
+    }
+  }
+}
+
+fragment FullType on __Type {
+  kind
+  name
+  description
+  fields(includeDeprecated: true) {
+    name
+    description
+    args {
+      ...InputValue
+    }
+    type {
+      ...TypeRef
+    }
+    isDeprecated
+    deprecationReason
+  }
+  inputFields {
+    ...InputValue
+  }
+  interfaces {
+    ...TypeRef
+  }
+  enumValues(includeDeprecated: true) {
+    name
+    description
+    isDeprecated
+    deprecationReason
+  }
+  possibleTypes {
+    ...TypeRef
+  }
+}
+
+fragment InputValue on __InputValue {
+  name
+  description
+  type {
+    ...TypeRef
+  }
+  defaultValue
+}
+
+fragment TypeRef on __Type {
+  kind
+  name
+  ofType {
+    kind
+    name
+    ofType {
+      kind
+      name
+      ofType {
+        kind
+        name
+        ofType {
+          kind
+          name
+          ofType {
+            kind
+            name
+            ofType {
+              kind
+              name
+              ofType {
+                kind
+                name
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
+`
diff --git a/vendor/github.com/99designs/gqlgen/graphql/introspection/schema.go b/vendor/github.com/99designs/gqlgen/graphql/introspection/schema.go
new file mode 100644
index 00000000..b5d2c482
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/introspection/schema.go
@@ -0,0 +1,68 @@
+package introspection
+
+import (
+	"strings"
+
+	"github.com/vektah/gqlparser/ast"
+)
+
+type Schema struct {
+	schema *ast.Schema
+}
+
+func (s *Schema) Types() []Type {
+	var types []Type
+	for _, typ := range s.schema.Types {
+		if strings.HasPrefix(typ.Name, "__") {
+			continue
+		}
+		types = append(types, *WrapTypeFromDef(s.schema, typ))
+	}
+	return types
+}
+
+func (s *Schema) QueryType() *Type {
+	return WrapTypeFromDef(s.schema, s.schema.Query)
+}
+
+func (s *Schema) MutationType() *Type {
+	return WrapTypeFromDef(s.schema, s.schema.Mutation)
+}
+
+func (s *Schema) SubscriptionType() *Type {
+	return WrapTypeFromDef(s.schema, s.schema.Subscription)
+}
+
+func (s *Schema) Directives() []Directive {
+	var res []Directive
+
+	for _, d := range s.schema.Directives {
+		res = append(res, s.directiveFromDef(d))
+	}
+
+	return res
+}
+
+func (s *Schema) directiveFromDef(d *ast.DirectiveDefinition) Directive {
+	var locs []string
+	for _, loc := range d.Locations {
+		locs = append(locs, string(loc))
+	}
+
+	var args []InputValue
+	for _, arg := range d.Arguments {
+		args = append(args, InputValue{
+			Name:         arg.Name,
+			Description:  arg.Description,
+			DefaultValue: defaultValue(arg.DefaultValue),
+			Type:         WrapTypeFromType(s.schema, arg.Type),
+		})
+	}
+
+	return Directive{
+		Name:        d.Name,
+		Description: d.Description,
+		Locations:   locs,
+		Args:        args,
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/introspection/type.go b/vendor/github.com/99designs/gqlgen/graphql/introspection/type.go
new file mode 100644
index 00000000..dce144e0
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/introspection/type.go
@@ -0,0 +1,174 @@
+package introspection
+
+import (
+	"strings"
+
+	"github.com/vektah/gqlparser/ast"
+)
+
+type Type struct {
+	schema *ast.Schema
+	def    *ast.Definition
+	typ    *ast.Type
+}
+
+func WrapTypeFromDef(s *ast.Schema, def *ast.Definition) *Type {
+	if def == nil {
+		return nil
+	}
+	return &Type{schema: s, def: def}
+}
+
+func WrapTypeFromType(s *ast.Schema, typ *ast.Type) *Type {
+	if typ == nil {
+		return nil
+	}
+
+	if !typ.NonNull && typ.NamedType != "" {
+		return &Type{schema: s, def: s.Types[typ.NamedType]}
+	}
+	return &Type{schema: s, typ: typ}
+}
+
+func (t *Type) Kind() string {
+	if t.typ != nil {
+		if t.typ.NonNull {
+			return "NON_NULL"
+		}
+
+		if t.typ.Elem != nil {
+			return "LIST"
+		}
+	} else {
+		return string(t.def.Kind)
+	}
+
+	panic("UNKNOWN")
+}
+
+func (t *Type) Name() *string {
+	if t.def == nil {
+		return nil
+	}
+	return &t.def.Name
+}
+
+func (t *Type) Description() string {
+	if t.def == nil {
+		return ""
+	}
+	return t.def.Description
+}
+
+func (t *Type) Fields(includeDeprecated bool) []Field {
+	if t.def == nil || (t.def.Kind != ast.Object && t.def.Kind != ast.Interface) {
+		return nil
+	}
+	var fields []Field
+	for _, f := range t.def.Fields {
+		if strings.HasPrefix(f.Name, "__") {
+			continue
+		}
+
+		var args []InputValue
+		for _, arg := range f.Arguments {
+			args = append(args, InputValue{
+				Type:         WrapTypeFromType(t.schema, arg.Type),
+				Name:         arg.Name,
+				Description:  arg.Description,
+				DefaultValue: defaultValue(arg.DefaultValue),
+			})
+		}
+
+		fields = append(fields, Field{
+			Name:              f.Name,
+			Description:       f.Description,
+			Args:              args,
+			Type:              WrapTypeFromType(t.schema, f.Type),
+			IsDeprecated:      isDeprecated(f.Directives),
+			DeprecationReason: deprecationReason(f.Directives),
+		})
+	}
+	return fields
+}
+
+func (t *Type) InputFields() []InputValue {
+	if t.def == nil || t.def.Kind != ast.InputObject {
+		return nil
+	}
+
+	var res []InputValue
+	for _, f := range t.def.Fields {
+		res = append(res, InputValue{
+			Name:         f.Name,
+			Description:  f.Description,
+			Type:         WrapTypeFromType(t.schema, f.Type),
+			DefaultValue: defaultValue(f.DefaultValue),
+		})
+	}
+	return res
+}
+
+func defaultValue(value *ast.Value) *string {
+	if value == nil {
+		return nil
+	}
+	val := value.String()
+	return &val
+}
+
+func (t *Type) Interfaces() []Type {
+	if t.def == nil || t.def.Kind != ast.Object {
+		return nil
+	}
+
+	var res []Type
+	for _, intf := range t.def.Interfaces {
+		res = append(res, *WrapTypeFromDef(t.schema, t.schema.Types[intf]))
+	}
+
+	return res
+}
+
+func (t *Type) PossibleTypes() []Type {
+	if t.def == nil || (t.def.Kind != ast.Interface && t.def.Kind != ast.Union) {
+		return nil
+	}
+
+	var res []Type
+	for _, pt := range t.schema.GetPossibleTypes(t.def) {
+		res = append(res, *WrapTypeFromDef(t.schema, pt))
+	}
+	return res
+}
+
+func (t *Type) EnumValues(includeDeprecated bool) []EnumValue {
+	if t.def == nil || t.def.Kind != ast.Enum {
+		return nil
+	}
+
+	var res []EnumValue
+	for _, val := range t.def.EnumValues {
+		res = append(res, EnumValue{
+			Name:              val.Name,
+			Description:       val.Description,
+			IsDeprecated:      isDeprecated(val.Directives),
+			DeprecationReason: deprecationReason(val.Directives),
+		})
+	}
+	return res
+}
+
+func (t *Type) OfType() *Type {
+	if t.typ == nil {
+		return nil
+	}
+	if t.typ.NonNull {
+		// fake non null nodes
+		cpy := *t.typ
+		cpy.NonNull = false
+
+		return WrapTypeFromType(t.schema, &cpy)
+	}
+	return WrapTypeFromType(t.schema, t.typ.Elem)
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/jsonw.go b/vendor/github.com/99designs/gqlgen/graphql/jsonw.go
new file mode 100644
index 00000000..c112444a
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/jsonw.go
@@ -0,0 +1,83 @@
+package graphql
+
+import (
+	"io"
+	"strconv"
+)
+
+var nullLit = []byte(`null`)
+var trueLit = []byte(`true`)
+var falseLit = []byte(`false`)
+var openBrace = []byte(`{`)
+var closeBrace = []byte(`}`)
+var openBracket = []byte(`[`)
+var closeBracket = []byte(`]`)
+var colon = []byte(`:`)
+var comma = []byte(`,`)
+
+var Null = &lit{nullLit}
+var True = &lit{trueLit}
+var False = &lit{falseLit}
+
+type Marshaler interface {
+	MarshalGQL(w io.Writer)
+}
+
+type Unmarshaler interface {
+	UnmarshalGQL(v interface{}) error
+}
+
+type OrderedMap struct {
+	Keys   []string
+	Values []Marshaler
+}
+
+type WriterFunc func(writer io.Writer)
+
+func (f WriterFunc) MarshalGQL(w io.Writer) {
+	f(w)
+}
+
+func NewOrderedMap(len int) *OrderedMap {
+	return &OrderedMap{
+		Keys:   make([]string, len),
+		Values: make([]Marshaler, len),
+	}
+}
+
+func (m *OrderedMap) Add(key string, value Marshaler) {
+	m.Keys = append(m.Keys, key)
+	m.Values = append(m.Values, value)
+}
+
+func (m *OrderedMap) MarshalGQL(writer io.Writer) {
+	writer.Write(openBrace)
+	for i, key := range m.Keys {
+		if i != 0 {
+			writer.Write(comma)
+		}
+		io.WriteString(writer, strconv.Quote(key))
+		writer.Write(colon)
+		m.Values[i].MarshalGQL(writer)
+	}
+	writer.Write(closeBrace)
+}
+
+type Array []Marshaler
+
+func (a Array) MarshalGQL(writer io.Writer) {
+	writer.Write(openBracket)
+	for i, val := range a {
+		if i != 0 {
+			writer.Write(comma)
+		}
+		val.MarshalGQL(writer)
+	}
+	writer.Write(closeBracket)
+}
+
+type lit struct{ b []byte }
+
+func (l lit) MarshalGQL(w io.Writer) {
+	w.Write(l.b)
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/map.go b/vendor/github.com/99designs/gqlgen/graphql/map.go
new file mode 100644
index 00000000..1e91d1d9
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/map.go
@@ -0,0 +1,24 @@
+package graphql
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+)
+
+func MarshalMap(val map[string]interface{}) Marshaler {
+	return WriterFunc(func(w io.Writer) {
+		err := json.NewEncoder(w).Encode(val)
+		if err != nil {
+			panic(err)
+		}
+	})
+}
+
+func UnmarshalMap(v interface{}) (map[string]interface{}, error) {
+	if m, ok := v.(map[string]interface{}); ok {
+		return m, nil
+	}
+
+	return nil, fmt.Errorf("%T is not a map", v)
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/oneshot.go b/vendor/github.com/99designs/gqlgen/graphql/oneshot.go
new file mode 100644
index 00000000..dd31f5ba
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/oneshot.go
@@ -0,0 +1,14 @@
+package graphql
+
+func OneShot(resp *Response) func() *Response {
+	var oneshot bool
+
+	return func() *Response {
+		if oneshot {
+			return nil
+		}
+		oneshot = true
+
+		return resp
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/recovery.go b/vendor/github.com/99designs/gqlgen/graphql/recovery.go
new file mode 100644
index 00000000..3aa032dc
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/recovery.go
@@ -0,0 +1,19 @@
+package graphql
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"runtime/debug"
+)
+
+type RecoverFunc func(ctx context.Context, err interface{}) (userMessage error)
+
+func DefaultRecover(ctx context.Context, err interface{}) error {
+	fmt.Fprintln(os.Stderr, err)
+	fmt.Fprintln(os.Stderr)
+	debug.PrintStack()
+
+	return errors.New("internal system error")
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/response.go b/vendor/github.com/99designs/gqlgen/graphql/response.go
new file mode 100644
index 00000000..18664dca
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/response.go
@@ -0,0 +1,20 @@
+package graphql
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/vektah/gqlparser/gqlerror"
+)
+
+type Response struct {
+	Data   json.RawMessage `json:"data"`
+	Errors gqlerror.List   `json:"errors,omitempty"`
+}
+
+func ErrorResponse(ctx context.Context, messagef string, args ...interface{}) *Response {
+	return &Response{
+		Errors: gqlerror.List{{Message: fmt.Sprintf(messagef, args...)}},
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/string.go b/vendor/github.com/99designs/gqlgen/graphql/string.go
new file mode 100644
index 00000000..d5fb3294
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/string.go
@@ -0,0 +1,63 @@
+package graphql
+
+import (
+	"fmt"
+	"io"
+	"strconv"
+)
+
+const encodeHex = "0123456789ABCDEF"
+
+func MarshalString(s string) Marshaler {
+	return WriterFunc(func(w io.Writer) {
+		start := 0
+		io.WriteString(w, `"`)
+
+		for i, c := range s {
+			if c < 0x20 || c == '\\' || c == '"' {
+				io.WriteString(w, s[start:i])
+
+				switch c {
+				case '\t':
+					io.WriteString(w, `\t`)
+				case '\r':
+					io.WriteString(w, `\r`)
+				case '\n':
+					io.WriteString(w, `\n`)
+				case '\\':
+					io.WriteString(w, `\\`)
+				case '"':
+					io.WriteString(w, `\"`)
+				default:
+					io.WriteString(w, `\u00`)
+					w.Write([]byte{encodeHex[c>>4], encodeHex[c&0xf]})
+				}
+
+				start = i + 1
+			}
+		}
+
+		io.WriteString(w, s[start:])
+		io.WriteString(w, `"`)
+	})
+}
+func UnmarshalString(v interface{}) (string, error) {
+	switch v := v.(type) {
+	case string:
+		return v, nil
+	case int:
+		return strconv.Itoa(v), nil
+	case float64:
+		return fmt.Sprintf("%f", v), nil
+	case bool:
+		if v {
+			return "true", nil
+		} else {
+			return "false", nil
+		}
+	case nil:
+		return "null", nil
+	default:
+		return "", fmt.Errorf("%T is not a string", v)
+	}
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/time.go b/vendor/github.com/99designs/gqlgen/graphql/time.go
new file mode 100644
index 00000000..4f448560
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/time.go
@@ -0,0 +1,21 @@
+package graphql
+
+import (
+	"errors"
+	"io"
+	"strconv"
+	"time"
+)
+
+func MarshalTime(t time.Time) Marshaler {
+	return WriterFunc(func(w io.Writer) {
+		io.WriteString(w, strconv.Quote(t.Format(time.RFC3339)))
+	})
+}
+
+func UnmarshalTime(v interface{}) (time.Time, error) {
+	if tmpStr, ok := v.(string); ok {
+		return time.Parse(time.RFC3339, tmpStr)
+	}
+	return time.Time{}, errors.New("time should be RFC3339 formatted string")
+}
diff --git a/vendor/github.com/99designs/gqlgen/graphql/version.go b/vendor/github.com/99designs/gqlgen/graphql/version.go
new file mode 100644
index 00000000..38d3720b
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/graphql/version.go
@@ -0,0 +1,3 @@
+package graphql
+
+const Version = "v0.5.1"