frostfs-node/services/public/object/query.go
alexvanin dadfd90dcd Initial commit
Initial public review release v0.10.0
2020-07-10 17:45:00 +03:00

234 lines
4.8 KiB
Go

package object
import (
"context"
"fmt"
"regexp"
"github.com/nspcc-dev/neofs-api-go/object"
"github.com/nspcc-dev/neofs-api-go/query"
"github.com/nspcc-dev/neofs-node/internal"
"github.com/nspcc-dev/neofs-node/lib/localstore"
"github.com/nspcc-dev/neofs-node/lib/transport"
"go.uber.org/zap"
)
type (
queryVersionController struct {
m map[int]localQueryImposer
}
coreQueryImposer struct {
fCreator filterCreator
lsLister localstore.Iterator
log *zap.Logger
}
filterCreator interface {
createFilter(query.Query) Filter
}
coreFilterCreator struct{}
)
const (
queryFilterName = "QUERY_FILTER"
pmUndefinedFilterType = "undefined filter type %d"
errUnsupportedQueryVersion = internal.Error("unsupported query version number")
)
const errSearchQueryUnmarshal = internal.Error("query unmarshal failure")
const errLocalQueryImpose = internal.Error("local query imposing failure")
var (
_ filterCreator = (*coreFilterCreator)(nil)
_ localQueryImposer = (*queryVersionController)(nil)
_ localQueryImposer = (*coreQueryImposer)(nil)
)
func (s *queryVersionController) imposeQuery(ctx context.Context, c CID, d []byte, v int) ([]Address, error) {
imp := s.m[v]
if imp == nil {
return nil, errUnsupportedQueryVersion
}
return imp.imposeQuery(ctx, c, d, v)
}
func (s *coreQueryImposer) imposeQuery(ctx context.Context, cid CID, qData []byte, _ int) (res []Address, err error) {
defer func() {
switch err {
case nil, errSearchQueryUnmarshal:
default:
s.log.Error("local query imposing failure",
zap.String("error", err.Error()),
)
err = errLocalQueryImpose
}
}()
var q query.Query
if err = q.Unmarshal(qData); err != nil {
s.log.Error("could not unmarshal search query",
zap.String("error", err.Error()),
)
return nil, errSearchQueryUnmarshal
} else if err = mouldQuery(cid, &q); err != nil {
return
}
err = s.lsLister.Iterate(
s.fCreator.createFilter(q),
func(meta *Meta) (stop bool) {
res = append(res, Address{
CID: meta.Object.SystemHeader.CID,
ObjectID: meta.Object.SystemHeader.ID,
})
return
},
)
return res, err
}
func (s *coreFilterCreator) createFilter(q query.Query) Filter {
f, err := localstore.AllPassIncludingFilter(queryFilterName, &localstore.FilterParams{
FilterFunc: func(_ context.Context, o *Meta) *localstore.FilterResult {
if !imposeQuery(q, o.Object) {
return localstore.ResultFail()
}
return localstore.ResultPass()
},
})
if err != nil {
panic(err) // TODO: test panic occasion
}
return f
}
func mouldQuery(cid CID, q *query.Query) error {
var (
withCID bool
cidStr = cid.String()
)
for i := range q.Filters {
if q.Filters[i].Name == KeyCID {
if q.Filters[i].Value != cidStr {
return errInvalidCIDFilter
}
withCID = true
}
}
if !withCID {
q.Filters = append(q.Filters, QueryFilter{
Type: query.Filter_Exact,
Name: KeyCID,
Value: cidStr,
})
}
return nil
}
func imposeQuery(q query.Query, o *Object) bool {
fs := make(map[string]*QueryFilter)
for i := range q.Filters {
switch q.Filters[i].Name {
case transport.KeyTombstone:
if !o.IsTombstone() {
return false
}
default:
fs[q.Filters[i].Name] = &q.Filters[i]
}
}
if !filterSystemHeader(fs, &o.SystemHeader) {
return false
}
orphan := true
for i := range o.Headers {
var key, value string
switch h := o.Headers[i].Value.(type) {
case *object.Header_Link:
switch h.Link.Type {
case object.Link_Parent:
delete(fs, transport.KeyHasParent)
key = transport.KeyParent
orphan = false
case object.Link_Previous:
key = KeyPrev
case object.Link_Next:
key = KeyNext
case object.Link_Child:
if _, ok := fs[transport.KeyNoChildren]; ok {
return false
}
key = KeyChild
default:
continue
}
value = h.Link.ID.String()
case *object.Header_UserHeader:
key, value = h.UserHeader.Key, h.UserHeader.Value
case *object.Header_StorageGroup:
key = transport.KeyStorageGroup
default:
continue
}
if !applyFilter(fs, key, value) {
return false
}
}
if _, ok := fs[KeyRootObject]; ok && orphan { // we think that object without parents is a root or user's object
delete(fs, KeyRootObject)
}
delete(fs, transport.KeyNoChildren)
return len(fs) == 0
}
func filterSystemHeader(fs map[string]*QueryFilter, sysHead *SystemHeader) bool {
return applyFilter(fs, KeyID, sysHead.ID.String()) &&
applyFilter(fs, KeyCID, sysHead.CID.String()) &&
applyFilter(fs, KeyOwnerID, sysHead.OwnerID.String())
}
func applyFilter(fs map[string]*QueryFilter, key, value string) bool {
f := fs[key]
if f == nil {
return true
}
delete(fs, key)
switch f.Type {
case query.Filter_Exact:
return value == f.Value
case query.Filter_Regex:
regex, err := regexp.Compile(f.Value)
return err == nil && regex.MatchString(value)
default:
panic(fmt.Sprintf(pmUndefinedFilterType, f.Type))
}
}