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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,195 @@ | ||
| package exec | ||
|
|
||
| import ( | ||
| "reflect" | ||
| "strings" | ||
|
|
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| "github.com/neelance/graphql-go/internal/query" | ||
| "github.com/neelance/graphql-go/internal/schema" | ||
| ) | ||
|
|
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| type Exec struct { | ||
| iExec | ||
| resolver reflect.Value | ||
| } | ||
|
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| func Make(s *schema.Schema, resolver interface{}) *Exec { | ||
| t := s.Types[s.EntryPoints["query"]] | ||
| return &Exec{ | ||
| iExec: makeExec(s, t, reflect.TypeOf(resolver), make(map[typeRefMapKey]*typeRefExec)), | ||
| resolver: reflect.ValueOf(resolver), | ||
| } | ||
| } | ||
|
|
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| func (e *Exec) Exec(document *query.Document, variables map[string]interface{}, selSet *query.SelectionSet) interface{} { | ||
| return e.exec(&request{document, variables}, selSet, e.resolver) | ||
| } | ||
|
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| func makeExec(s *schema.Schema, t schema.Type, resolverType reflect.Type, typeRefMap map[typeRefMapKey]*typeRefExec) iExec { | ||
| switch t := t.(type) { | ||
| case *schema.Scalar: | ||
| return &scalarExec{} | ||
|
|
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| case *schema.Object: | ||
| fields := make(map[string]*fieldExec) | ||
|
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| for name, f := range t.Fields { | ||
| methodIndex := -1 | ||
| for i := 0; i < resolverType.NumMethod(); i++ { | ||
| if strings.EqualFold(name, resolverType.Method(i).Name) { | ||
| methodIndex = i | ||
| break | ||
| } | ||
| } | ||
| if methodIndex == -1 { | ||
| continue // TODO error | ||
| } | ||
|
|
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| fields[name] = &fieldExec{ | ||
| field: f, | ||
| methodIndex: methodIndex, | ||
| valueExec: makeExec(s, f.Type, resolverType.Method(methodIndex).Type.Out(0), typeRefMap), | ||
| } | ||
| } | ||
|
|
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| return &objectExec{ | ||
| fields: fields, | ||
| } | ||
|
|
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| case *schema.Enum: | ||
| return &scalarExec{} | ||
|
|
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| case *schema.List: | ||
| return &listExec{ | ||
| elem: makeExec(s, t.Elem, resolverType.Elem(), typeRefMap), | ||
| } | ||
|
|
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| case *schema.TypeReference: | ||
| refT := s.Types[t.Name] | ||
| k := typeRefMapKey{refT, resolverType} | ||
| e, ok := typeRefMap[k] | ||
| if !ok { | ||
| e = &typeRefExec{} | ||
| typeRefMap[k] = e | ||
| e.iExec = makeExec(s, refT, resolverType, typeRefMap) | ||
| } | ||
| return e | ||
|
|
||
| default: | ||
| panic("invalid type") | ||
| } | ||
| } | ||
|
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| type request struct { | ||
| *query.Document | ||
| Variables map[string]interface{} | ||
| } | ||
|
|
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| type iExec interface { | ||
| exec(r *request, selSet *query.SelectionSet, resolver reflect.Value) interface{} | ||
| } | ||
|
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| type scalarExec struct{} | ||
|
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| func (e *scalarExec) exec(r *request, selSet *query.SelectionSet, resolver reflect.Value) interface{} { | ||
| return resolver.Interface() | ||
| } | ||
|
|
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| type listExec struct { | ||
| elem iExec | ||
| } | ||
|
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| func (e *listExec) exec(r *request, selSet *query.SelectionSet, resolver reflect.Value) interface{} { | ||
| l := make([]interface{}, resolver.Len()) | ||
| for i := range l { | ||
| l[i] = e.elem.exec(r, selSet, resolver.Index(i)) | ||
| } | ||
| return l | ||
| } | ||
|
|
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| type typeRefExec struct { | ||
| iExec | ||
| } | ||
|
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| type typeRefMapKey struct { | ||
| s schema.Type | ||
| r reflect.Type | ||
| } | ||
|
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| type objectExec struct { | ||
| fields map[string]*fieldExec | ||
| } | ||
|
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| func (e *objectExec) exec(r *request, selSet *query.SelectionSet, resolver reflect.Value) interface{} { | ||
| result := make(map[string]interface{}) | ||
| e.execFragment(r, selSet, resolver, result) | ||
| return result | ||
| } | ||
|
|
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| func (e *objectExec) execFragment(r *request, selSet *query.SelectionSet, resolver reflect.Value, result map[string]interface{}) { | ||
| for _, sel := range selSet.Selections { | ||
| switch sel := sel.(type) { | ||
| case *query.Field: | ||
| if skipByDirective(r, sel.Directives) { | ||
| continue | ||
| } | ||
| e.fields[sel.Name].exec(r, sel, resolver, result) | ||
| case *query.FragmentSpread: | ||
| if skipByDirective(r, sel.Directives) { | ||
| continue | ||
| } | ||
| e.execFragment(r, r.Fragments[sel.Name].SelSet, resolver, result) | ||
| default: | ||
| panic("invalid type") | ||
| } | ||
| } | ||
| } | ||
|
|
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| type fieldExec struct { | ||
| field *schema.Field | ||
| methodIndex int | ||
| valueExec iExec | ||
| } | ||
|
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| func (e *fieldExec) exec(r *request, f *query.Field, resolver reflect.Value, result map[string]interface{}) { | ||
| m := resolver.Method(e.methodIndex) | ||
| var in []reflect.Value | ||
| if len(e.field.Parameters) != 0 { | ||
| args := reflect.New(m.Type().In(0)) | ||
| for name, param := range e.field.Parameters { | ||
| value, ok := f.Arguments[name] | ||
| if !ok { | ||
| value = &query.Literal{Value: param.Default} | ||
| } | ||
| rf := args.Elem().FieldByNameFunc(func(n string) bool { return strings.EqualFold(n, name) }) | ||
| rf.Set(reflect.ValueOf(execValue(r, value))) | ||
| } | ||
| in = []reflect.Value{args.Elem()} | ||
| } | ||
| result[f.Alias] = e.valueExec.exec(r, f.SelSet, m.Call(in)[0]) | ||
| } | ||
|
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| func skipByDirective(r *request, d map[string]*query.Directive) bool { | ||
| if skip, ok := d["skip"]; ok { | ||
| if execValue(r, skip.Arguments["if"]).(bool) { | ||
| return true | ||
| } | ||
| } | ||
| if include, ok := d["include"]; ok { | ||
| if !execValue(r, include.Arguments["if"]).(bool) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
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| func execValue(r *request, v query.Value) interface{} { | ||
| switch v := v.(type) { | ||
| case *query.Variable: | ||
| return r.Variables[v.Name] | ||
| case *query.Literal: | ||
| return v.Value | ||
| default: | ||
| panic("invalid value") | ||
| } | ||
| } |