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object_index.go
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object_index.go
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package sod
import (
"encoding/json"
"errors"
"fmt"
"reflect"
)
var (
ErrUnkownField = errors.New("unknown object field")
ErrFieldNotIndexed = errors.New("field not indexed")
ErrUnkownSearchOperator = errors.New("unknown search operator")
ErrCasting = errors.New("casting error")
ErrConstraintUnique = errors.New("uniqueness constraint")
)
func IsUnique(err error) bool {
return errors.Is(err, ErrConstraintUnique)
}
func valueFieldByName(v reflect.Value, fields []string) (out reflect.Value, ok bool) {
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
out = v.FieldByName(fields[0])
// if pointer we dereference
if out.Kind() == reflect.Ptr {
if out.IsZero() {
out = reflect.New(out.Type().Elem())
} else {
out = out.Elem()
}
return valueFieldByName(out, fields[1:])
}
if out.Kind() == reflect.Struct && len(fields) > 1 {
return valueFieldByName(out, fields[1:])
}
return out, out.IsValid()
}
func fieldByName(o Object, fpath []string) (i interface{}, ok bool) {
v := reflect.ValueOf(o)
v, ok = valueFieldByName(v, fpath)
if !ok {
return nil, ok
}
return v.Interface(), ok
}
type jsonObjIndex struct {
Fields map[string]*fieldIndex `json:"fields"`
ObjectIds map[uint64]string `json:"object-ids"`
}
type objIndex struct {
// used to generate ObjectId
i uint64
// mapping Object UUID -> ObjectId (in the index)
uuids map[string]uint64
Fields map[string]*fieldIndex
// mapping ObjectId -> Object UUID
ObjectIds map[uint64]string
}
func (in *objIndex) MarshalJSON() ([]byte, error) {
return json.Marshal(&jsonObjIndex{Fields: in.Fields, ObjectIds: in.ObjectIds})
}
func (in *objIndex) UnmarshalJSON(data []byte) error {
tmp := jsonObjIndex{}
if err := json.Unmarshal(data, &tmp); err != nil {
return err
}
in.i = 0
in.Fields = tmp.Fields
in.ObjectIds = tmp.ObjectIds
in.uuids = make(map[string]uint64)
// we search next index to use for object
for i, uuid := range in.ObjectIds {
if i > in.i {
in.i = i
}
in.uuids[uuid] = i
}
// we don't want to reuse an existing index
in.i++
return nil
}
func newIndex(fields FieldDescMap) *objIndex {
i := &objIndex{i: 0,
uuids: make(map[string]uint64),
Fields: make(map[string]*fieldIndex),
ObjectIds: make(map[uint64]string)}
for _, fd := range fields {
if fd.Constraints.Index || fd.Constraints.Unique {
i.Fields[fd.Path] = newFieldIndex(fd)
}
}
return i
}
func (in *objIndex) satisfyAll(o Object) (err error) {
for fn, fi := range in.Fields {
if v, ok := fieldByName(o, fi.nameSplit); ok {
var iField *indexedField
if iField, err = searchField(v); err != nil {
return
}
// check constraint on value
objid, exists := in.uuids[o.UUID()]
if err = fi.Satisfy(objid, exists, iField); err != nil {
return fmt.Errorf("field %s does not satisfy %w", fn, err)
}
} else {
return fmt.Errorf("cannot satisfy constraint %w %s", ErrUnkownField, fn)
}
}
return
}
func (in *objIndex) insertOrUpdate(o Object) (err error) {
// check constraint on all index first to prevent
// inconsistencies across indexes
if err = in.satisfyAll(o); err != nil {
return
}
// the object is already known, we update
if i, ok := in.uuids[o.UUID()]; ok {
for fn, fi := range in.Fields {
if v, ok := fieldByName(o, fi.nameSplit); ok {
if err = fi.Update(v, i); err != nil {
return
}
} else {
return fmt.Errorf("%w %s", ErrUnkownField, fn)
}
}
} else {
for fn, fi := range in.Fields {
if v, ok := fieldByName(o, fi.nameSplit); ok {
if err = fi.Insert(v, in.i); err != nil {
return
}
} else {
return fmt.Errorf("%w %s", ErrUnkownField, fn)
}
}
// we insert after any potential error
in.ObjectIds[in.i] = o.UUID()
in.uuids[o.UUID()] = in.i
in.i++
}
return nil
}
func (in *objIndex) deleteByUUID(uuid string) {
if index, ok := in.uuids[uuid]; ok {
for _, fi := range in.Fields {
fi.Delete(index)
}
delete(in.ObjectIds, index)
delete(in.uuids, uuid)
}
}
func (in *objIndex) search(o Object, field string, operator string, value interface{}, constrain []*indexedField) ([]*indexedField, error) {
var iField *indexedField
var err error
if _, ok := fieldByName(o, fieldPath(field)); ok {
if iField, err = searchField(value); err != nil {
return nil, err
}
// if field is indexed
if fi, ok := in.Fields[field]; ok {
if fi.Cast != iField.valueTypeString() {
return nil, fmt.Errorf("%w, cannot cast %T(%v) to %s", ErrCasting, value, value, fi.Cast)
}
if constrain != nil {
fi = fi.Constrain(constrain)
}
switch operator {
case "!=":
return fi.SearchNotEqual(iField), nil
case "=":
return fi.SearchEqual(iField), nil
case ">":
return fi.SearchGreater(iField), nil
case ">=":
return fi.SearchGreaterOrEqual(iField), nil
case "<":
return fi.SearchLess(iField), nil
case "<=":
return fi.SearchLessOrEqual(iField), nil
case "~=":
return fi.SearchByRegex(iField)
default:
return nil, fmt.Errorf("%w %s", ErrUnkownSearchOperator, operator)
}
}
return nil, fmt.Errorf("%w %s", ErrFieldNotIndexed, field)
} else {
return nil, fmt.Errorf("%w %s for object %T", ErrUnkownField, field, o)
}
}
func (in *objIndex) control() error {
for fn := range in.Fields {
if !in.Fields[fn].Control() {
return fmt.Errorf("field index %s is not ordered", fn)
}
if in.Fields[fn].Len() != in.len() {
return fmt.Errorf("index and fields index must have the same size, len(index)=%d len(index[%s])=%d", in.len(), fn, in.Fields[fn].Len())
}
}
return nil
}
func (in *objIndex) len() int {
return len(in.ObjectIds)
}