81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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package cache
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import (
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"context"
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"fmt"
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"time"
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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/things"
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)
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const (
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keyPrefix = "thing_key"
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idPrefix = "thing_id"
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)
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var _ things.Cache = (*thingCache)(nil)
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type thingCache struct {
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client *redis.Client
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keyDuration time.Duration
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}
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// NewCache returns redis thing cache implementation.
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func NewCache(client *redis.Client, duration time.Duration) things.Cache {
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return &thingCache{
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client: client,
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keyDuration: duration,
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}
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}
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func (tc *thingCache) Save(ctx context.Context, thingKey string, thingID string) error {
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tkey := fmt.Sprintf("%s:%s", keyPrefix, thingKey)
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if err := tc.client.Set(ctx, tkey, thingID, tc.keyDuration).Err(); err != nil {
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return errors.Wrap(errors.ErrCreateEntity, err)
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}
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tid := fmt.Sprintf("%s:%s", idPrefix, thingID)
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if err := tc.client.Set(ctx, tid, thingKey, tc.keyDuration).Err(); err != nil {
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return errors.Wrap(errors.ErrCreateEntity, err)
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}
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return nil
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}
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func (tc *thingCache) ID(ctx context.Context, thingKey string) (string, error) {
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tkey := fmt.Sprintf("%s:%s", keyPrefix, thingKey)
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thingID, err := tc.client.Get(ctx, tkey).Result()
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if err != nil {
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return "", errors.Wrap(errors.ErrNotFound, err)
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}
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if thingID == "" {
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return "", errors.ErrNotFound
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}
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return thingID, nil
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}
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func (tc *thingCache) Remove(ctx context.Context, thingID string) error {
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tid := fmt.Sprintf("%s:%s", idPrefix, thingID)
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key, err := tc.client.Get(ctx, tid).Result()
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// Redis returns Nil Reply when key does not exist.
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if err == redis.Nil {
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return nil
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}
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if err != nil {
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return errors.Wrap(errors.ErrRemoveEntity, err)
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}
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tkey := fmt.Sprintf("%s:%s", keyPrefix, key)
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if err := tc.client.Del(ctx, tkey, tid).Err(); err != nil {
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return errors.Wrap(errors.ErrRemoveEntity, err)
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}
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return nil
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}
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