mirror of https://github.com/harness/drone.git
115 lines
2.6 KiB
Go
115 lines
2.6 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cache
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import (
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"context"
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"errors"
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"fmt"
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"sync/atomic"
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"time"
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"github.com/go-redis/redis/v8"
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)
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type LogErrFn func(context.Context, error)
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type Redis[K any, V any] struct {
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client redis.UniversalClient
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duration time.Duration
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getter Getter[K, V]
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keyEncoder func(K) string
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codec Codec[V]
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countHit atomic.Int64
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countMiss atomic.Int64
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logErrFn LogErrFn
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}
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type Encoder[V any] interface {
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Encode(value V) string
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}
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type Decoder[V any] interface {
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Decode(encoded string) (V, error)
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}
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type Codec[V any] interface {
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Encoder[V]
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Decoder[V]
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}
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func NewRedis[K any, V any](
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client redis.UniversalClient,
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getter Getter[K, V],
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keyEncoder func(K) string,
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codec Codec[V],
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duration time.Duration,
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logErrFn LogErrFn,
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) *Redis[K, V] {
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return &Redis[K, V]{
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client: client,
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duration: duration,
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getter: getter,
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keyEncoder: keyEncoder,
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codec: codec,
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logErrFn: logErrFn,
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}
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}
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// Stats returns number of cache hits and misses and can be used to monitor the cache efficiency.
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func (c *Redis[K, V]) Stats() (int64, int64) {
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return c.countHit.Load(), c.countMiss.Load()
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}
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// Get implements the cache.Cache interface.
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func (c *Redis[K, V]) Get(ctx context.Context, key K) (V, error) {
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var nothing V
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strKey := c.keyEncoder(key)
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raw, err := c.client.Get(ctx, strKey).Result()
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if err == nil {
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value, decErr := c.codec.Decode(raw)
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if decErr == nil {
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c.countHit.Add(1)
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return value, nil
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}
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} else if !errors.Is(err, redis.Nil) && c.logErrFn != nil {
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c.logErrFn(ctx, err)
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}
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c.countMiss.Add(1)
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item, err := c.getter.Find(ctx, key)
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if err != nil {
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return nothing, fmt.Errorf("cache: failed to find one: %w", err)
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}
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err = c.client.Set(ctx, strKey, c.codec.Encode(item), c.duration).Err()
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if err != nil && c.logErrFn != nil {
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c.logErrFn(ctx, err)
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}
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return item, nil
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}
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func (c *Redis[K, V]) Evict(ctx context.Context, key K) {
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strKey := c.keyEncoder(key)
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err := c.client.Del(ctx, strKey).Err()
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if err != nil && c.logErrFn != nil {
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c.logErrFn(ctx, err)
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}
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}
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