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mutator_builtin.go
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/
mutator_builtin.go
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package mttor
import (
"context"
"fmt"
"reflect"
"github.com/teawithsand/arcah/internal/refutil"
"github.com/teawithsand/reval/stdesc"
"go.mongodb.org/mongo-driver/bson"
)
type setMutation struct {
}
func (sm *setMutation) ApplyMutation(ctx context.Context, target reflect.Value, field stdesc.Field, data MutatorData) (err error) {
field.MustSet(target, reflect.ValueOf(data.Value))
return
}
func (sm *setMutation) MongoMutationName() string {
return "$set"
}
func (sm *setMutation) RenderMongoDoc(ctx context.Context, data MongoMutatorData) (entry bson.E, err error) {
return bson.E{
Key: data.BSONFieldName,
Value: data.Value,
}, nil
}
type incMutation struct {
}
func (sm *incMutation) ApplyMutation(ctx context.Context, target reflect.Value, field stdesc.Field, data MutatorData) (err error) {
prevValue := refutil.ValueToNumber(field.MustGet(target))
modValue := refutil.ValueToNumber(reflect.ValueOf(data.Value))
if prevValue == nil {
err = &Error{
Descriptorion: fmt.Sprintf("inc mutation target field is not number"),
}
return
}
if modValue == nil {
err = &Error{
Descriptorion: fmt.Sprintf("mutator value target field is not number"),
}
return
}
if reflect.TypeOf(prevValue) != reflect.TypeOf(modValue) {
err = &Error{
Descriptorion: fmt.Sprintf("numbers in mutator and field have different types"),
}
return
}
var tempResult interface{}
switch pv := prevValue.(type) {
case int64:
tempResult = pv + modValue.(int64)
case uint64:
tempResult = pv + modValue.(uint64)
case float64:
tempResult = pv + modValue.(float64)
}
field.MustSet(target, reflect.ValueOf(tempResult))
return
}
func (sm *incMutation) MongoMutationName() string {
return "$inc"
}
func (sm *incMutation) RenderMongoDoc(ctx context.Context, data MongoMutatorData) (entry bson.E, err error) {
return bson.E{
Key: data.BSONFieldName,
Value: data.Value,
}, nil
}
type pushMutation struct {
}
func (sm *pushMutation) ApplyMutation(ctx context.Context, target reflect.Value, field stdesc.Field, data MutatorData) (err error) {
targetFieldValue := field.MustGet(target)
if targetFieldValue.Type().Kind() != reflect.Slice {
err = &Error{
Descriptorion: fmt.Sprintf("target is not slice"),
}
return
}
pushValue := reflect.ValueOf(data.Value)
if pushValue.Type() == targetFieldValue.Type().Elem() {
targetFieldValue = reflect.Append(targetFieldValue, pushValue)
} else if pushValue.Type().Kind() == reflect.Slice && pushValue.Type().Elem() == targetFieldValue.Type().Elem() {
targetFieldValue = reflect.AppendSlice(targetFieldValue, pushValue)
} else if pushValue.Type().Kind() == reflect.Array && pushValue.Type().Elem() == targetFieldValue.Type().Elem() {
targetFieldValue = reflect.AppendSlice(targetFieldValue, pushValue.Slice(0, pushValue.Len()))
} else {
err = &Error{
Descriptorion: fmt.Sprintf("element of type %T is not compatible with slice of type %T", data.Value, targetFieldValue.Interface()),
}
return
}
field.MustSet(target, targetFieldValue)
return
}
func (sm *pushMutation) MongoMutationName() string {
return "$push"
}
func (sm *pushMutation) RenderMongoDoc(ctx context.Context, data MongoMutatorData) (entry bson.E, err error) {
var value interface{}
if reflect.TypeOf(data.Value).Kind() != reflect.Slice {
sliceValue := reflect.MakeSlice(reflect.SliceOf(reflect.TypeOf(data.Value)), 1, 1)
sliceValue.Index(0).Set(reflect.ValueOf(data.Value))
value = sliceValue.Interface()
} else {
value = data.Value
}
return bson.E{
Key: data.BSONFieldName,
Value: bson.D{
bson.E{
Key: "$each",
Value: value,
},
},
}, nil
}