forked from wundergraph/graphql-go-tools
/
federation.go
187 lines (163 loc) · 4.54 KB
/
federation.go
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// Code generated by github.com/99designs/gqlgen, DO NOT EDIT.
package generated
import (
"context"
"errors"
"fmt"
"strings"
"sync"
"github.com/99designs/gqlgen/plugin/federation/fedruntime"
)
var (
ErrUnknownType = errors.New("unknown type")
ErrTypeNotFound = errors.New("type not found")
)
func (ec *executionContext) __resolve__service(ctx context.Context) (fedruntime.Service, error) {
if ec.DisableIntrospection {
return fedruntime.Service{}, errors.New("federated introspection disabled")
}
var sdl []string
for _, src := range sources {
if src.BuiltIn {
continue
}
sdl = append(sdl, src.Input)
}
return fedruntime.Service{
SDL: strings.Join(sdl, "\n"),
}, nil
}
func (ec *executionContext) __resolve_entities(ctx context.Context, representations []map[string]interface{}) []fedruntime.Entity {
list := make([]fedruntime.Entity, len(representations))
repsMap := map[string]struct {
i []int
r []map[string]interface{}
}{}
// We group entities by typename so that we can parallelize their resolution.
// This is particularly helpful when there are entity groups in multi mode.
buildRepresentationGroups := func(reps []map[string]interface{}) {
for i, rep := range reps {
typeName, ok := rep["__typename"].(string)
if !ok {
// If there is no __typename, we just skip the representation;
// we just won't be resolving these unknown types.
ec.Error(ctx, errors.New("__typename must be an existing string"))
continue
}
_r := repsMap[typeName]
_r.i = append(_r.i, i)
_r.r = append(_r.r, rep)
repsMap[typeName] = _r
}
}
isMulti := func(typeName string) bool {
switch typeName {
default:
return false
}
}
resolveEntity := func(ctx context.Context, typeName string, rep map[string]interface{}, idx []int, i int) (err error) {
// we need to do our own panic handling, because we may be called in a
// goroutine, where the usual panic handling can't catch us
defer func() {
if r := recover(); r != nil {
err = ec.Recover(ctx, r)
}
}()
switch typeName {
case "Product":
resolverName, err := entityResolverNameForProduct(ctx, rep)
if err != nil {
return fmt.Errorf(`finding resolver for Entity "Product": %w`, err)
}
switch resolverName {
case "findProductByUpc":
id0, err := ec.unmarshalNString2string(ctx, rep["upc"])
if err != nil {
return fmt.Errorf(`unmarshalling param 0 for findProductByUpc(): %w`, err)
}
entity, err := ec.resolvers.Entity().FindProductByUpc(ctx, id0)
if err != nil {
return fmt.Errorf(`resolving Entity "Product": %w`, err)
}
list[idx[i]] = entity
return nil
}
}
return fmt.Errorf("%w: %s", ErrUnknownType, typeName)
}
resolveManyEntities := func(ctx context.Context, typeName string, reps []map[string]interface{}, idx []int) (err error) {
// we need to do our own panic handling, because we may be called in a
// goroutine, where the usual panic handling can't catch us
defer func() {
if r := recover(); r != nil {
err = ec.Recover(ctx, r)
}
}()
switch typeName {
default:
return errors.New("unknown type: " + typeName)
}
}
resolveEntityGroup := func(typeName string, reps []map[string]interface{}, idx []int) {
if isMulti(typeName) {
err := resolveManyEntities(ctx, typeName, reps, idx)
if err != nil {
ec.Error(ctx, err)
}
} else {
// if there are multiple entities to resolve, parallelize (similar to
// graphql.FieldSet.Dispatch)
var e sync.WaitGroup
e.Add(len(reps))
for i, rep := range reps {
i, rep := i, rep
go func(i int, rep map[string]interface{}) {
err := resolveEntity(ctx, typeName, rep, idx, i)
if err != nil {
ec.Error(ctx, err)
}
e.Done()
}(i, rep)
}
e.Wait()
}
}
buildRepresentationGroups(representations)
switch len(repsMap) {
case 0:
return list
case 1:
for typeName, reps := range repsMap {
resolveEntityGroup(typeName, reps.r, reps.i)
}
return list
default:
var g sync.WaitGroup
g.Add(len(repsMap))
for typeName, reps := range repsMap {
go func(typeName string, reps []map[string]interface{}, idx []int) {
resolveEntityGroup(typeName, reps, idx)
g.Done()
}(typeName, reps.r, reps.i)
}
g.Wait()
return list
}
}
func entityResolverNameForProduct(ctx context.Context, rep map[string]interface{}) (string, error) {
for {
var (
m map[string]interface{}
val interface{}
ok bool
)
_ = val
m = rep
if _, ok = m["upc"]; !ok {
break
}
return "findProductByUpc", nil
}
return "", fmt.Errorf("%w for Product", ErrTypeNotFound)
}