/
redis.go
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/
redis.go
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//
// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Package service manages the main logic of server.
package service
import (
"context"
"reflect"
"github.com/vdaas/vald/internal/db/kvs/redis"
"github.com/vdaas/vald/internal/errors"
)
type Redis interface {
Connect(context.Context) error
Disconnect() error
Get(context.Context, string) (string, error)
GetMultiple(context.Context, ...string) ([]string, error)
GetInverse(context.Context, string) (string, error)
GetInverseMultiple(context.Context, ...string) ([]string, error)
Set(context.Context, string, string) error
SetMultiple(context.Context, map[string]string) error
Delete(context.Context, string) (string, error)
DeleteMultiple(context.Context, ...string) ([]string, error)
DeleteInverse(context.Context, string) (string, error)
DeleteInverseMultiple(context.Context, ...string) ([]string, error)
}
type client struct {
connector redis.Connector
db redis.Redis
kvPrefix string
vkPrefix string
prefixDelimiter string
}
func New(opts ...Option) (Redis, error) {
c := new(client)
for _, opt := range append(defaultOptions, opts...) {
if err := opt(c); err != nil {
return nil, errors.ErrOptionFailed(err, reflect.ValueOf(opt))
}
}
return c, nil
}
func (c *client) Disconnect() error {
return c.db.Close()
}
func (c *client) Connect(ctx context.Context) (err error) {
if c.connector != nil {
c.db, err = c.connector.Connect(ctx)
if err != nil {
return err
}
}
return nil
}
func (c *client) Get(ctx context.Context, key string) (string, error) {
return c.get(ctx, c.kvPrefix, key)
}
func (c *client) GetMultiple(ctx context.Context, keys ...string) (vals []string, err error) {
return c.getMulti(ctx, c.kvPrefix, keys...)
}
func (c *client) GetInverse(ctx context.Context, val string) (string, error) {
return c.get(ctx, c.vkPrefix, val)
}
func (c *client) GetInverseMultiple(ctx context.Context, vals ...string) ([]string, error) {
return c.getMulti(ctx, c.vkPrefix, vals...)
}
func (c *client) appendPrefix(prefix, key string) string {
return prefix + c.prefixDelimiter + key
}
func (c *client) get(ctx context.Context, prefix, key string) (val string, err error) {
pipe := c.db.TxPipeline()
res := pipe.Get(ctx, c.appendPrefix(prefix, key))
_, err = pipe.Exec(ctx)
if err != nil {
if err == redis.Nil {
return "", errors.ErrRedisNotFound(key)
}
return "", errors.ErrRedisGetOperationFailed(key, err)
}
err = res.Err()
if err != nil {
if err == redis.Nil {
return "", errors.ErrRedisNotFound(key)
}
return "", errors.ErrRedisGetOperationFailed(key, err)
}
return res.Val(), nil
}
func (c *client) getMulti(ctx context.Context, prefix string, keys ...string) (vals []string, err error) {
pipe := c.db.TxPipeline()
ress := make(map[string]*redis.StringCmd, len(keys))
for _, k := range keys {
ress[k] = pipe.Get(ctx, c.appendPrefix(prefix, k))
}
if _, err = pipe.Exec(ctx); err != nil {
for _, key := range keys {
err = errors.Wrap(errors.ErrRedisGetOperationFailed(key, err), err.Error())
}
return nil, err
}
vals = make([]string, 0, len(ress))
for _, k := range keys {
res := ress[k]
err = res.Err()
if err != nil {
if err == redis.Nil {
err = errors.Wrap(errors.ErrRedisNotFound(k), err.Error())
} else {
err = errors.Wrap(errors.ErrRedisGetOperationFailed(k, err), err.Error())
}
vals = append(vals, "")
continue
}
vals = append(vals, res.Val())
}
return vals, err
}
func (c *client) Set(ctx context.Context, key, val string) (err error) {
kvKey := c.appendPrefix(c.kvPrefix, key)
vkKey := c.appendPrefix(c.vkPrefix, val)
pipe := c.db.TxPipeline()
kv := pipe.Set(ctx, kvKey, val, 0)
vk := pipe.Set(ctx, vkKey, key, 0)
_, err = pipe.Exec(ctx)
if err != nil {
return err
}
err = kv.Err()
if err != nil {
err = errors.ErrRedisSetOperationFailed(kvKey, err)
dberr := c.db.Del(ctx, vkKey).Err()
if dberr != nil {
err = errors.Wrap(err, dberr.Error())
}
return err
}
err = vk.Err()
if err != nil {
err = errors.ErrRedisSetOperationFailed(vkKey, err)
dberr := c.db.Del(ctx, kvKey).Err()
if dberr != nil {
err = errors.Wrap(err, dberr.Error())
}
return err
}
return nil
}
func (c *client) SetMultiple(ctx context.Context, kvs map[string]string) (err error) {
pipe := c.db.TxPipeline()
vks := make(map[string]string, len(kvs))
kvress := make(map[string]*redis.StatusCmd, len(kvs))
vkress := make(map[string]*redis.StatusCmd, len(kvs))
for k, v := range kvs {
if len(k) == 0 || len(v) == 0 {
continue
}
vks[v] = k
kvKey := c.appendPrefix(c.kvPrefix, k)
vkKey := c.appendPrefix(c.vkPrefix, v)
kvress[vkKey] = pipe.Set(ctx, kvKey, v, 0)
vkress[kvKey] = pipe.Set(ctx, vkKey, k, 0)
}
if _, err = pipe.Exec(ctx); err != nil {
return err
}
for vkKey, res := range kvress {
if err = res.Err(); err != nil {
err = errors.ErrRedisSetOperationFailed(vks[vkKey], err)
dberr := c.db.Del(ctx, vkKey).Err()
if dberr != nil {
err = errors.Wrap(err, dberr.Error())
}
}
}
for kvKey, res := range vkress {
if err = res.Err(); err != nil {
err = errors.ErrRedisSetOperationFailed(kvs[kvKey], err)
dberr := c.db.Del(ctx, kvKey).Err()
if dberr != nil {
err = errors.Wrap(err, dberr.Error())
}
}
}
return err
}
func (c *client) Delete(ctx context.Context, key string) (string, error) {
return c.delete(ctx, c.kvPrefix, c.vkPrefix, key)
}
func (c *client) DeleteMultiple(ctx context.Context, keys ...string) ([]string, error) {
return c.deleteMulti(ctx, c.kvPrefix, c.vkPrefix, keys...)
}
func (c *client) DeleteInverse(ctx context.Context, val string) (string, error) {
return c.delete(ctx, c.vkPrefix, c.kvPrefix, val)
}
func (c *client) DeleteInverseMultiple(ctx context.Context, vals ...string) ([]string, error) {
return c.deleteMulti(ctx, c.vkPrefix, c.kvPrefix, vals...)
}
func (c *client) delete(ctx context.Context, pfx, pfxInv, key string) (val string, err error) {
val, err = c.get(ctx, pfx, key)
if err != nil {
return "", err
}
pipe := c.db.TxPipeline()
k := pipe.Del(ctx, c.appendPrefix(pfx, key))
v := pipe.Del(ctx, c.appendPrefix(pfxInv, val))
if _, err = pipe.Exec(ctx); err != nil {
return "", err
}
if err = k.Err(); err != nil {
if pfx == c.kvPrefix {
return "", errors.Wrap(c.Set(ctx, key, val), err.Error())
}
return "", errors.Wrap(c.Set(ctx, val, key), err.Error())
}
if err = v.Err(); err != nil {
if pfx == c.kvPrefix {
return "", errors.Wrap(c.Set(ctx, key, val), err.Error())
}
return "", errors.Wrap(c.Set(ctx, val, key), err.Error())
}
return val, nil
}
func (c *client) deleteMulti(ctx context.Context, pfx, pfxInv string, keys ...string) (vals []string, err error) {
vals, err = c.getMulti(ctx, pfx, keys...)
if err != nil {
return nil, err
}
pipe := c.db.TxPipeline()
ress := make(map[string]*redis.IntCmd, len(keys)*2)
for _, k := range keys {
key := c.appendPrefix(pfx, k)
ress[key] = pipe.Del(ctx, key)
}
for _, v := range vals {
key := c.appendPrefix(pfxInv, v)
ress[key] = pipe.Del(ctx, key)
}
if _, err = pipe.Exec(ctx); err != nil {
return nil, err
}
var errs error
for k, res := range ress {
if err = res.Err(); err != nil {
err = errors.ErrRedisDeleteOperationFailed(k, err)
if errs == nil {
errs = err
} else {
errs = errors.Wrap(err, errs.Error())
}
continue
}
}
return vals, errs
}