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store.go
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store.go
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//
// KULADO INC. CONFIDENTIAL
// __________________
//
// [2014] - [2019] KULADO INC.
// All Rights Reserved.
//
// NOTICE: All information contained herein is, and remains
// the property of KULADO INC. and its suppliers,
// if any. The intellectual and technical concepts contained
// herein are proprietary to KULADO INC.
// and its suppliers and may be covered by Russian Federation and Foreign Patents,
// patents in process, and are protected by trade secret or copyright law.
// Dissemination of this information or reproduction of this material
// is strictly forbidden unless prior written permission is obtained
// from KULADO INC..
//
package v3
import (
"errors"
"path"
"reflect"
"regexp"
"strings"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/onedomain/lastbackend/pkg/log"
"github.com/onedomain/lastbackend/pkg/storage/etcd/store"
"github.com/onedomain/lastbackend/pkg/storage/types"
"github.com/onedomain/lastbackend/pkg/util/converter"
"github.com/onedomain/lastbackend/pkg/util/serializer"
"github.com/onedomain/lastbackend/pkg/util/validator"
"golang.org/x/net/context"
)
type dbstore struct {
store.Store
debug bool
client *clientv3.Client
opts []clientv3.OpOption
codec serializer.Codec
pathPrefix string
watcher *watcher
}
func (s *dbstore) Info(ctx context.Context, key string) (*types.System, error) {
key = path.Join(s.pathPrefix, key)
r := new(types.System)
log.V(logLevel).Debugf("%s:count:> key: %s with filter: %s", logPrefix, key)
getResp, err := s.client.KV.Get(ctx, key, clientv3.WithPrefix())
if err != nil {
log.V(logLevel).Errorf("%s:count:> request err: %v", logPrefix, err)
return r, err
}
r.Storage.Revision = getResp.Header.Revision
return r, nil
}
func (s *dbstore) Count(ctx context.Context, key, keyRegexFilter string) (int, error) {
key = path.Join(s.pathPrefix, key)
log.V(logLevel).Debugf("%s:count:> key: %s with filter: %s", logPrefix, key, keyRegexFilter)
getResp, err := s.client.KV.Get(ctx, key, clientv3.WithPrefix())
if err != nil {
log.V(logLevel).Errorf("%s:count:> request err: %v", logPrefix, err)
return 0, err
}
r, _ := regexp.Compile(keyRegexFilter)
if len(keyRegexFilter) == 0 {
return len(getResp.Kvs), nil
}
count := 0
for _, kv := range getResp.Kvs {
if r.MatchString(string(kv.Key)) {
count++
}
}
return count, nil
}
func (s *dbstore) Put(ctx context.Context, key string, obj, outPtr interface{}, ttl uint64) error {
key = path.Join(s.pathPrefix, key)
log.V(logLevel).Debugf("%s:create:> key: %s, ttl: %d, val: %#v", logPrefix, key, ttl, obj)
data, err := serializer.Encode(s.codec, obj)
if err != nil {
log.V(logLevel).Errorf("%s:create:> encode data err: %v", logPrefix, err)
return err
}
opts, err := s.ttlOpts(ctx, int64(ttl))
if err != nil {
log.V(logLevel).Errorf("%s:create:> create ttl option err: %v", logPrefix, err)
return err
}
txnResp, err := s.client.KV.Txn(ctx).
If(clientv3.Compare(clientv3.ModRevision(key), "=", 0)).
Then(clientv3.OpPut(key, string(data), opts...)).Commit()
if err != nil {
log.V(logLevel).Errorf("%s:create:> request err: %v", logPrefix, err)
return err
}
if !txnResp.Succeeded {
return errors.New(types.ErrEntityExists)
}
if validator.IsNil(outPtr) {
log.V(logLevel).Warn("%s:Create: output struct is nil")
return nil
} else {
if err := decode(s.codec, data, outPtr); err != nil {
log.V(logLevel).Errorf("%s:create:> decode data err: %v", logPrefix, err)
return err
}
}
if err := setEntityRuntimeInfo(outPtr, getRuntimeFromResponse(txnResp.Header)); err != nil {
log.V(logLevel).Errorf("%s:get:> can not set runtime info err: %v", logPrefix, err)
return err
}
return nil
}
func (s *dbstore) Get(ctx context.Context, key string, outPtr interface{}, rev *int64) error {
key = path.Join(s.pathPrefix, key)
log.V(logLevel).Debugf("%s:get:> key: %s", key)
res, err := s.client.KV.Get(ctx, key, s.opts...)
if err != nil {
log.V(logLevel).Errorf("%s:get:> request err: %v", logPrefix, err)
return err
}
if len(res.Kvs) == 0 {
return errors.New(types.ErrEntityNotFound)
}
if err := decode(s.codec, res.Kvs[0].Value, outPtr); err != nil {
log.V(logLevel).Errorf("%s:get:> decode data err: %v", logPrefix, err)
return err
}
if err := setEntityRuntimeInfo(outPtr, getRuntimeFromResponse(res.Header)); err != nil {
log.V(logLevel).Errorf("%s:get:> can not set runtime info err: %v", logPrefix, err)
return err
}
return nil
}
func (s *dbstore) List(ctx context.Context, key, keyRegexFilter string, listOutPtr interface{}, rev *int64) error {
key = path.Join(s.pathPrefix, key)
log.V(logLevel).Debugf("%s:list:> key: %s with filter: %s", logPrefix, key, keyRegexFilter)
getResp, err := s.client.KV.Get(ctx, key, clientv3.WithPrefix(), clientv3.WithSort(clientv3.SortByCreateRevision, clientv3.SortDescend))
if err != nil {
log.V(logLevel).Errorf("%s:list:> request err: %v", logPrefix, err)
return err
}
r, _ := regexp.Compile(keyRegexFilter)
items := make(map[string]*mvccpb.KeyValue)
for _, kv := range getResp.Kvs {
keys := strings.Split(string(kv.Key), "/")
node := keys[len(keys)-1]
if (keyRegexFilter != "") && !r.MatchString(string(kv.Key)) {
continue
}
items[node] = kv
}
if err := decodeList(s.codec, items, listOutPtr); err != nil {
log.V(logLevel).Errorf("%s:list:> decode data err: %v", logPrefix, err)
return err
}
if err := setEntityRuntimeInfo(listOutPtr, getRuntimeFromResponse(getResp.Header)); err != nil {
log.V(logLevel).Errorf("%s:get:> can not set runtime info err: %v", logPrefix, err)
return err
}
return nil
}
func (s *dbstore) Map(ctx context.Context, key, keyRegexFilter string, mapOutPtr interface{}, rev *int64) error {
key = path.Join(s.pathPrefix, key)
log.V(logLevel).Debugf("%s:map:> key: %s with filter: %s", logPrefix, key, keyRegexFilter)
getResp, err := s.client.KV.Get(ctx, key, clientv3.WithPrefix(), clientv3.WithSort(clientv3.SortByCreateRevision, clientv3.SortDescend))
if err != nil {
log.V(logLevel).Errorf("%s:map:> request err: %v", logPrefix, err)
return err
}
r, _ := regexp.Compile(keyRegexFilter)
items := make(map[string]*mvccpb.KeyValue, len(getResp.Kvs))
for _, kv := range getResp.Kvs {
if keyRegexFilter != "" && r.MatchString(string(kv.Key)) {
keys := r.FindStringSubmatch(string(kv.Key))
items[keys[1]] = kv
} else {
items[string(kv.Key)] = kv
}
}
if len(items) == 0 {
return nil
}
if err := decodeMap(s.codec, items, mapOutPtr); err != nil {
log.V(logLevel).Errorf("%s:map:> decode data err: %v", logPrefix, err)
return err
}
if err := setEntityRuntimeInfo(mapOutPtr, getRuntimeFromResponse(getResp.Header)); err != nil {
log.V(logLevel).Errorf("%s:get:> can not set runtime info err: %v", logPrefix, err)
return err
}
return nil
}
func (s *dbstore) Set(ctx context.Context, key string, obj, outPtr interface{}, ttl uint64, force bool, rev *int64) error {
key = path.Join(s.pathPrefix, key)
log.V(logLevel).Debugf("%s:update:> key: %s, ttl: %d, val: %#v", logPrefix, key, ttl, obj)
data, err := serializer.Encode(s.codec, obj)
if err != nil {
log.V(logLevel).Errorf("%s:update:> encode data err: %v", logPrefix, err)
return err
}
opts, err := s.ttlOpts(ctx, int64(ttl))
if err != nil {
log.V(logLevel).Errorf("%s:update:> create ttl option err: %v", logPrefix, err)
return err
}
txn := s.client.KV.Txn(ctx)
if !force {
rv := int64(0)
if rev != nil {
rv = *rev
}
txn = txn.If(clientv3.Compare(clientv3.ModRevision(key), "!=", rv))
}
txnResp, err := txn.
Then(clientv3.OpPut(key, string(data), opts...)).
Commit()
if err != nil {
log.V(logLevel).Errorf("%s:update:> request err: %v", logPrefix, err)
return err
}
if !txnResp.Succeeded {
return errors.New(types.ErrEntityNotFound)
}
if validator.IsNil(outPtr) {
log.V(logLevel).Warnf("%s:Update: output struct is nil", logPrefix)
return nil
}
if outPtr != nil {
if err := decode(s.codec, data, outPtr); err != nil {
log.V(logLevel).Errorf("%s:update:> decode data err: %v", logPrefix, err)
return err
}
}
if err := setEntityRuntimeInfo(outPtr, getRuntimeFromResponse(txnResp.Header)); err != nil {
log.V(logLevel).Errorf("%s:get:> can not set runtime info err: %v", logPrefix, err)
return err
}
return nil
}
func (s *dbstore) Del(ctx context.Context, key string) error {
key = path.Join(s.pathPrefix, key)
log.V(logLevel).Debugf("%s:delete:> key: %s", logPrefix, key)
_, err := s.client.KV.Txn(ctx).
Then(clientv3.OpGet(key), clientv3.OpDelete(key, clientv3.WithPrefix())).
Commit()
if err != nil {
log.V(logLevel).Errorf("%s:delete:> request err: %v", logPrefix, err)
return err
}
return nil
}
func (s *dbstore) Begin(ctx context.Context) store.TX {
log.V(logLevel).Debugf("%s:begin:> start transaction", logPrefix)
t := new(tx)
t.dbstore = s
t.context = ctx
t.txn = s.client.KV.Txn(ctx)
return t
}
func (s *dbstore) Watch(ctx context.Context, key, keyRegexFilter string, rev *int64) (types.Watcher, error) {
log.V(logLevel).Debugf("%s:watch:> key: %s, filter: %s", logPrefix, key, keyRegexFilter)
key = path.Join(s.pathPrefix, key)
return s.watcher.Watch(ctx, key, keyRegexFilter, rev)
}
func (s *dbstore) Decode(ctx context.Context, value []byte, out interface{}) error {
return decode(s.codec, value, out)
}
func setEntityRuntimeInfo(out interface{}, runtime types.System) error {
var (
v reflect.Value
err error
)
if reflect.TypeOf(out).Kind() == reflect.Ptr {
v, err = converter.EnforcePtr(out)
if err != nil {
return errors.New("unable to convert output struct to pointer")
}
} else {
v = reflect.ValueOf(out)
}
setValueRuntimeInfo(v, runtime)
return nil
}
func setValueRuntimeInfo(v reflect.Value, runtime types.System) error {
if v.Kind() != reflect.Struct {
return nil
}
f := v.FieldByName("System")
if !f.IsValid() {
return nil
}
if !f.CanSet() {
return nil
}
f.Set(reflect.ValueOf(runtime.System))
return nil
}
func getRuntimeFromResponse(res *etcdserverpb.ResponseHeader) types.System {
runtime := types.System{}
runtime.Storage.Revision = res.Revision
return runtime
}
func getRuntimeFromValue(res *mvccpb.KeyValue) types.System {
runtime := types.System{}
runtime.Storage.Revision = res.ModRevision
return runtime
}
func decode(s serializer.Codec, value []byte, out interface{}) error {
if _, err := converter.EnforcePtr(out); err != nil {
return errors.New("unable to convert output struct to pointer")
}
return serializer.Decode(s, value, out)
}
func decodeList(codec serializer.Codec, items map[string]*mvccpb.KeyValue, listOut interface{}) error {
v, err := converter.EnforcePtr(listOut)
if err != nil {
return errors.New(types.ErrStructOutIsInvalid)
}
f := v.FieldByName("Items")
if f.Kind() != reflect.Slice {
return errors.New(types.ErrStructOutIsInvalid)
}
if !f.IsValid() {
return nil
}
if !f.CanSet() {
return nil
}
for _, item := range items {
var obj = reflect.New(f.Type().Elem()).Interface().(interface{})
err := serializer.Decode(codec, item.Value, obj)
if err != nil {
return err
}
setValueRuntimeInfo(reflect.Indirect(reflect.ValueOf(obj).Elem()), getRuntimeFromValue(item))
f.Set(reflect.Append(f, reflect.ValueOf(obj).Elem()))
}
return nil
}
func decodeMap(codec serializer.Codec, items map[string]*mvccpb.KeyValue, mapOut interface{}) error {
v, err := converter.EnforcePtr(mapOut)
if err != nil {
return errors.New(types.ErrStructOutIsInvalid)
}
f := v.FieldByName("Items")
if f.Kind() != reflect.Map {
return errors.New(types.ErrStructOutIsInvalid)
}
if !f.IsValid() {
return nil
}
if !f.CanSet() {
return nil
}
for key, item := range items {
var obj = reflect.New(f.Type().Elem()).Interface().(interface{})
err := serializer.Decode(codec, item.Value, obj)
if err != nil {
return err
}
setValueRuntimeInfo(reflect.Indirect(reflect.ValueOf(obj).Elem()), getRuntimeFromValue(item))
f.SetMapIndex(reflect.ValueOf(key), reflect.ValueOf(obj).Elem())
}
return nil
}
func (s *dbstore) ttlOpts(ctx context.Context, ttl int64) ([]clientv3.OpOption, error) {
if ttl == 0 {
return nil, nil
}
lcr, err := s.client.Lease.Grant(ctx, ttl)
if err != nil {
return nil, err
}
return []clientv3.OpOption{clientv3.WithLease(clientv3.LeaseID(lcr.ID))}, nil
}