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package codegen
import (
"fmt"
"strconv"
"strings"
"github.com/99designs/gqlgen/codegen/templates"
"github.com/pkg/errors"
"github.com/vektah/gqlparser/ast"
)
type Directive struct {
Name string
Args []*FieldArgument
Builtin bool
}
func (b *builder) buildDirectives() (map[string]*Directive, error) {
directives := make(map[string]*Directive, len(b.Schema.Directives))
for name, dir := range b.Schema.Directives {
if _, ok := directives[name]; ok {
return nil, errors.Errorf("directive with name %s already exists", name)
}
var builtin bool
if name == "skip" || name == "include" || name == "deprecated" {
builtin = true
}
var args []*FieldArgument
for _, arg := range dir.Arguments {
tr, err := b.Binder.TypeReference(arg.Type, nil)
if err != nil {
return nil, err
}
newArg := &FieldArgument{
ArgumentDefinition: arg,
TypeReference: tr,
VarName: templates.ToGoPrivate(arg.Name),
}
if arg.DefaultValue != nil {
var err error
newArg.Default, err = arg.DefaultValue.Value(nil)
if err != nil {
return nil, errors.Errorf("default value for directive argument %s(%s) is not valid: %s", dir.Name, arg.Name, err.Error())
}
}
args = append(args, newArg)
}
directives[name] = &Directive{
Name: name,
Args: args,
Builtin: builtin,
}
}
return directives, nil
}
func (b *builder) getDirectives(list ast.DirectiveList) ([]*Directive, error) {
dirs := make([]*Directive, len(list))
for i, d := range list {
argValues := make(map[string]interface{}, len(d.Arguments))
for _, da := range d.Arguments {
val, err := da.Value.Value(nil)
if err != nil {
return nil, err
}
argValues[da.Name] = val
}
def, ok := b.Directives[d.Name]
if !ok {
return nil, fmt.Errorf("directive %s not found", d.Name)
}
var args []*FieldArgument
for _, a := range def.Args {
value := a.Default
if argValue, ok := argValues[a.Name]; ok {
value = argValue
}
args = append(args, &FieldArgument{
ArgumentDefinition: a.ArgumentDefinition,
Value: value,
VarName: a.VarName,
TypeReference: a.TypeReference,
})
}
dirs[i] = &Directive{
Name: d.Name,
Args: args,
}
}
return dirs, nil
}
func (d *Directive) ArgsFunc() string {
if len(d.Args) == 0 {
return ""
}
return "dir_" + d.Name + "_args"
}
func (d *Directive) CallArgs() string {
args := []string{"ctx", "obj", "n"}
for _, arg := range d.Args {
args = append(args, "args["+strconv.Quote(arg.Name)+"].("+templates.CurrentImports.LookupType(arg.TypeReference.GO)+")")
}
return strings.Join(args, ", ")
}
func (d *Directive) ResolveArgs(obj string, next string) string {
args := []string{"ctx", obj, next}
for _, arg := range d.Args {
dArg := "&" + arg.VarName
if !arg.TypeReference.IsPtr() {
if arg.Value != nil {
dArg = templates.Dump(arg.Value)
} else {
dArg = templates.Dump(arg.Default)
}
} else if arg.Value == nil && arg.Default == nil {
dArg = "nil"
}
args = append(args, dArg)
}
return strings.Join(args, ", ")
}
func (d *Directive) Declaration() string {
res := ucFirst(d.Name) + " func(ctx context.Context, obj interface{}, next graphql.Resolver"
for _, arg := range d.Args {
res += fmt.Sprintf(", %s %s", arg.Name, templates.CurrentImports.LookupType(arg.TypeReference.GO))
}
res += ") (res interface{}, err error)"
return res
}
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