1 files changed, 70 insertions, 0 deletions
diff --git a/vendor/github.com/99designs/gqlgen/codegen/interface_build.go b/vendor/github.com/99designs/gqlgen/codegen/interface_build.go
new file mode 100644
index 00000000..9f4a4ff4
--- /dev/null
+++ b/vendor/github.com/99designs/gqlgen/codegen/interface_build.go
@@ -0,0 +1,70 @@
+package codegen
+
+import (
+	"fmt"
+	"go/types"
+	"os"
+	"sort"
+
+	"github.com/vektah/gqlparser/ast"
+	"golang.org/x/tools/go/loader"
+)
+
+func (cfg *Config) buildInterfaces(types NamedTypes, prog *loader.Program) []*Interface {
+	var interfaces []*Interface
+	for _, typ := range cfg.schema.Types {
+		if typ.Kind == ast.Union || typ.Kind == ast.Interface {
+			interfaces = append(interfaces, cfg.buildInterface(types, typ, prog))
+		}
+	}
+
+	sort.Slice(interfaces, func(i, j int) bool {
+		return interfaces[i].GQLType < interfaces[j].GQLType
+	})
+
+	return interfaces
+}
+
+func (cfg *Config) buildInterface(types NamedTypes, typ *ast.Definition, prog *loader.Program) *Interface {
+	i := &Interface{NamedType: types[typ.Name]}
+
+	for _, implementor := range cfg.schema.GetPossibleTypes(typ) {
+		t := types[implementor.Name]
+
+		i.Implementors = append(i.Implementors, InterfaceImplementor{
+			NamedType:     t,
+			ValueReceiver: cfg.isValueReceiver(types[typ.Name], t, prog),
+		})
+	}
+
+	return i
+}
+
+func (cfg *Config) isValueReceiver(intf *NamedType, implementor *NamedType, prog *loader.Program) bool {
+	interfaceType, err := findGoInterface(prog, intf.Package, intf.GoType)
+	if interfaceType == nil || err != nil {
+		return true
+	}
+
+	implementorType, err := findGoNamedType(prog, implementor.Package, implementor.GoType)
+	if implementorType == nil || err != nil {
+		return true
+	}
+
+	for i := 0; i < interfaceType.NumMethods(); i++ {
+		intfMethod := interfaceType.Method(i)
+
+		implMethod := findMethod(implementorType, intfMethod.Name())
+		if implMethod == nil {
+			fmt.Fprintf(os.Stderr, "missing method %s on %s\n", intfMethod.Name(), implementor.GoType)
+			return false
+		}
+
+		sig := implMethod.Type().(*types.Signature)
+		if _, isPtr := sig.Recv().Type().(*types.Pointer); isPtr {
+			return false
+		}
+	}
+
+	return true
+}