129 lines
3.6 KiB
Go
129 lines
3.6 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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package events
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import (
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"context"
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"fmt"
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"github.com/go-redis/redis/v8"
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"github.com/mainflux/mainflux/pkg/errors"
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"github.com/mainflux/mainflux/twins"
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)
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const (
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prefix = "twin"
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)
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var (
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// ErrRedisTwinSave indicates error while saving Twin in redis cache.
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ErrRedisTwinSave = errors.New("failed to save twin in redis cache")
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// ErrRedisTwinUpdate indicates error while saving Twin in redis cache.
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ErrRedisTwinUpdate = errors.New("failed to update twin in redis cache")
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// ErrRedisTwinIDs indicates error while getting Twin IDs from redis cache.
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ErrRedisTwinIDs = errors.New("failed to get twin id from redis cache")
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// ErrRedisTwinRemove indicates error while removing Twin from redis cache.
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ErrRedisTwinRemove = errors.New("failed to remove twin from redis cache")
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)
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var _ twins.TwinCache = (*twinCache)(nil)
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type twinCache struct {
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client *redis.Client
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}
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// NewTwinCache returns redis twin cache implementation.
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func NewTwinCache(client *redis.Client) twins.TwinCache {
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return &twinCache{
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client: client,
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}
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}
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func (tc *twinCache) Save(ctx context.Context, twin twins.Twin) error {
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return tc.save(ctx, twin)
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}
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func (tc *twinCache) Update(ctx context.Context, twin twins.Twin) error {
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if err := tc.remove(ctx, twin.ID); err != nil {
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return errors.Wrap(ErrRedisTwinUpdate, err)
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}
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if err := tc.save(ctx, twin); err != nil {
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return errors.Wrap(ErrRedisTwinUpdate, err)
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}
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return nil
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}
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func (tc *twinCache) SaveIDs(ctx context.Context, channel, subtopic string, ids []string) error {
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for _, id := range ids {
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if err := tc.client.SAdd(ctx, attrKey(channel, subtopic), id).Err(); err != nil {
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return errors.Wrap(ErrRedisTwinSave, err)
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}
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if err := tc.client.SAdd(ctx, twinKey(id), attrKey(channel, subtopic)).Err(); err != nil {
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return errors.Wrap(ErrRedisTwinSave, err)
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}
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}
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return nil
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}
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func (tc *twinCache) IDs(ctx context.Context, channel, subtopic string) ([]string, error) {
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ids, err := tc.client.SMembers(ctx, attrKey(channel, subtopic)).Result()
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if err != nil {
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return nil, errors.Wrap(ErrRedisTwinIDs, err)
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}
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idsWildcard, err := tc.client.SMembers(ctx, attrKey(channel, twins.SubtopicWildcard)).Result()
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if err != nil {
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return nil, errors.Wrap(ErrRedisTwinIDs, err)
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}
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ids = append(ids, idsWildcard...)
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return ids, nil
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}
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func (tc *twinCache) Remove(ctx context.Context, twinID string) error {
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return tc.remove(ctx, twinID)
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}
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func (tc *twinCache) save(ctx context.Context, twin twins.Twin) error {
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if len(twin.Definitions) < 1 {
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return nil
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}
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attributes := twin.Definitions[len(twin.Definitions)-1].Attributes
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for _, attr := range attributes {
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if err := tc.client.SAdd(ctx, attrKey(attr.Channel, attr.Subtopic), twin.ID).Err(); err != nil {
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return errors.Wrap(ErrRedisTwinSave, err)
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}
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if err := tc.client.SAdd(ctx, twinKey(twin.ID), attrKey(attr.Channel, attr.Subtopic)).Err(); err != nil {
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return errors.Wrap(ErrRedisTwinSave, err)
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}
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}
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return nil
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}
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func (tc *twinCache) remove(ctx context.Context, twinID string) error {
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twinKey := twinKey(twinID)
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attrKeys, err := tc.client.SMembers(ctx, twinKey).Result()
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if err != nil {
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return errors.Wrap(ErrRedisTwinRemove, err)
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}
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if err := tc.client.Del(ctx, twinKey).Err(); err != nil {
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return errors.Wrap(ErrRedisTwinRemove, err)
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}
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for _, attrKey := range attrKeys {
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if err := tc.client.SRem(ctx, attrKey, twinID).Err(); err != nil {
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return errors.Wrap(ErrRedisTwinRemove, err)
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}
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}
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return nil
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}
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func twinKey(twinID string) string {
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return fmt.Sprintf("%s:%s", prefix, twinID)
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}
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func attrKey(channel, subtopic string) string {
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return fmt.Sprintf("%s:%s-%s", prefix, channel, subtopic)
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}
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