// WriteProperty writes a Property to the buffer. `context` behaves the same
// way that it does for WriteKey, but only has an effect if `p` contains a
// Key as its Value.
func WriteProperty(buf Buffer, context KeyContext, p ds.Property) (err error) {
defer recoverTo(&err)
typb := byte(p.Type())
if p.IndexSetting() != ds.NoIndex {
typb |= 0x80
}
panicIf(buf.WriteByte(typb))
switch p.Type() {
case ds.PTNull:
case ds.PTBool:
b := p.Value().(bool)
if b {
err = buf.WriteByte(1)
} else {
err = buf.WriteByte(0)
}
case ds.PTInt:
_, err = cmpbin.WriteInt(buf, p.Value().(int64))
case ds.PTFloat:
_, err = cmpbin.WriteFloat64(buf, p.Value().(float64))
case ds.PTString:
_, err = cmpbin.WriteString(buf, p.Value().(string))
case ds.PTBytes:
_, err = cmpbin.WriteBytes(buf, p.Value().([]byte))
case ds.PTTime:
err = WriteTime(buf, p.Value().(time.Time))
case ds.PTGeoPoint:
err = WriteGeoPoint(buf, p.Value().(ds.GeoPoint))
case ds.PTKey:
err = WriteKey(buf, context, p.Value().(ds.Key))
case ds.PTBlobKey:
_, err = cmpbin.WriteString(buf, string(p.Value().(blobstore.Key)))
}
return
}
// writePropertyImpl is an implementation of WriteProperty and
// WriteIndexProperty.
func writePropertyImpl(buf Buffer, context KeyContext, p *ds.Property, index bool) (err error) {
defer recoverTo(&err)
it, v := p.IndexTypeAndValue()
if !index {
it = p.Type()
}
typb := byte(it)
if p.IndexSetting() != ds.NoIndex {
typb |= 0x80
}
panicIf(buf.WriteByte(typb))
err = writeIndexValue(buf, context, v)
return
}
func dsF2RProp(ctx context.Context, in ds.Property) (datastore.Property, error) {
err := error(nil)
ret := datastore.Property{
NoIndex: in.IndexSetting() == ds.NoIndex,
}
switch in.Type() {
case ds.PTBytes:
v := in.Value().([]byte)
if in.IndexSetting() == ds.ShouldIndex {
ret.Value = datastore.ByteString(v)
} else {
ret.Value = v
}
case ds.PTKey:
ret.Value, err = dsF2R(ctx, in.Value().(*ds.Key))
case ds.PTBlobKey:
ret.Value = appengine.BlobKey(in.Value().(bs.Key))
case ds.PTGeoPoint:
ret.Value = appengine.GeoPoint(in.Value().(ds.GeoPoint))
default:
ret.Value = in.Value()
}
return ret, err
}
func (q *queryImpl) Filter(fStr string, val interface{}) ds.Query {
prop := ""
op := qInvalid
p := ds.Property{}
return q.checkMutateClone(
func() error {
var err error
prop, op, err = parseFilter(fStr)
if err != nil {
return err
}
if q.kind == "" && prop != "__key__" {
// https://cloud.google.com/appengine/docs/go/datastore/queries#Go_Kindless_queries
return fmt.Errorf(
"kindless queries can only filter on __key__, got %q", fStr)
}
err = p.SetValue(val, ds.ShouldIndex)
if err != nil {
return err
}
if p.Type() == ds.PTKey {
if !p.Value().(ds.Key).Valid(false, globalAppID, q.ns) {
return ds.ErrInvalidKey
}
}
if prop == "__key__" {
if op == qEqual {
return fmt.Errorf(
"query equality filter on __key__ is silly: %q", fStr)
}
if p.Type() != ds.PTKey {
return fmt.Errorf("__key__ filter value is not a key: %T", val)
}
} else if strings.HasPrefix(prop, "__") && strings.HasSuffix(prop, "__") {
return fmt.Errorf("filter on reserved property: %q", prop)
}
if op != qEqual {
if q.ineqFilter.prop != "" && q.ineqFilter.prop != prop {
return fmt.Errorf(
"inequality filters on multiple properties: %q and %q",
q.ineqFilter.prop, prop)
}
if len(q.order) > 0 && q.order[0].Property != prop {
return fmt.Errorf(
"first sort order must match inequality filter: %q v %q",
q.order[0].Property, prop)
}
} else {
for _, p := range q.project {
if p == prop {
return fmt.Errorf(
"cannot project on field which is used in an equality filter: %q",
prop)
}
}
}
return err
},
func(q *queryImpl) {
if op == qEqual {
// add it to eq filters
q.addEqFilt(prop, p)
// remove it from sort orders.
// https://cloud.google.com/appengine/docs/go/datastore/queries#sort_orders_are_ignored_on_properties_with_equality_filters
toRm := -1
for i, o := range q.order {
if o.Property == prop {
toRm = i
break
}
}
if toRm >= 0 {
q.order = append(q.order[:toRm], q.order[toRm+1:]...)
}
} else {
q.ineqFilter.prop = prop
if q.ineqFilter.constrain(op, serialize.ToBytes(p)) {
q.err = errQueryDone
}
}
})
}