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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| // Copyright (c) The Thanos Authors. | ||
| // Licensed under the Apache License 2.0. | ||
|
|
||
| package cache | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| "github.com/go-kit/kit/log" | ||
| "github.com/go-kit/kit/log/level" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promauto" | ||
| "github.com/thanos-io/thanos/pkg/cacheutil" | ||
| ) | ||
|
|
||
| // RedisCache is a redis cache. | ||
| type RedisCache struct { | ||
| logger log.Logger | ||
| redisClient *cacheutil.RedisClient | ||
| name string | ||
|
|
||
| // Metrics. | ||
| requests prometheus.Counter | ||
| hits prometheus.Counter | ||
| } | ||
|
|
||
| // NewRedisCache makes a new RedisCache. | ||
| func NewRedisCache(name string, logger log.Logger, redisClient *cacheutil.RedisClient, reg prometheus.Registerer) *RedisCache { | ||
| c := &RedisCache{ | ||
| logger: logger, | ||
| redisClient: redisClient, | ||
| name: name, | ||
| } | ||
|
|
||
| c.requests = promauto.With(reg).NewCounter(prometheus.CounterOpts{ | ||
| Name: "thanos_cache_redis_requests_total", | ||
| Help: "Total number of items requests to redis.", | ||
| ConstLabels: prometheus.Labels{"name": name}, | ||
| }) | ||
|
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| c.hits = promauto.With(reg).NewCounter(prometheus.CounterOpts{ | ||
| Name: "thanos_cache_redis_hits_total", | ||
| Help: "Total number of items requests to the cache that were a hit.", | ||
| ConstLabels: prometheus.Labels{"name": name}, | ||
| }) | ||
|
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| level.Info(logger).Log("msg", "created redis cache") | ||
|
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| return c | ||
| } | ||
|
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| // Store data identified by keys. | ||
| func (c *RedisCache) Store(ctx context.Context, data map[string][]byte, ttl time.Duration) { | ||
| c.redisClient.SetMulti(ctx, data, ttl) | ||
| } | ||
|
|
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| // Fetch fetches multiple keys and returns a map containing cache hits, along with a list of missing keys. | ||
| // In case of error, it logs and return an empty cache hits map. | ||
| func (c *RedisCache) Fetch(ctx context.Context, keys []string) map[string][]byte { | ||
| c.requests.Add(float64(len(keys))) | ||
| results := c.redisClient.GetMulti(ctx, keys) | ||
| c.hits.Add(float64(len(results))) | ||
| return results | ||
| } | ||
|
|
||
| func (c *RedisCache) Name() string { | ||
| return c.name | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| package cache | ||
|
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||
| import ( | ||
| "context" | ||
| "os" | ||
| "testing" | ||
| "time" | ||
|
|
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| "github.com/alicebob/miniredis/v2" | ||
| "github.com/go-kit/kit/log" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| prom_testutil "github.com/prometheus/client_golang/prometheus/testutil" | ||
| "github.com/thanos-io/thanos/pkg/cacheutil" | ||
| "github.com/thanos-io/thanos/pkg/testutil" | ||
| ) | ||
|
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| func TestRedisCache(t *testing.T) { | ||
| // Init some data to conveniently define test cases later one. | ||
| key1 := "key1" | ||
| key2 := "key2" | ||
| key3 := "key3" | ||
| value1 := []byte{1} | ||
| value2 := []byte{2} | ||
| value3 := []byte{3} | ||
|
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| type args struct { | ||
| data map[string][]byte | ||
| fetchKeys []string | ||
| } | ||
| type want struct { | ||
| hits map[string][]byte | ||
| } | ||
| tests := []struct { | ||
| name string | ||
| args args | ||
| want want | ||
| }{ | ||
| { | ||
| name: "all hit", | ||
| args: args{ | ||
| data: map[string][]byte{ | ||
| key1: value1, | ||
| key2: value2, | ||
| key3: value3, | ||
| }, | ||
| fetchKeys: []string{key1, key2, key3}, | ||
| }, | ||
| want: want{ | ||
| hits: map[string][]byte{ | ||
| key1: value1, | ||
| key2: value2, | ||
| key3: value3, | ||
| }, | ||
| }, | ||
| }, | ||
| { | ||
| name: "partial hit", | ||
| args: args{ | ||
| data: map[string][]byte{ | ||
| key1: value1, | ||
| key2: value2, | ||
| }, | ||
| fetchKeys: []string{key1, key2, key3}, | ||
| }, | ||
| want: want{ | ||
| hits: map[string][]byte{ | ||
| key1: value1, | ||
| key2: value2, | ||
| }, | ||
| }, | ||
| }, | ||
| { | ||
| name: "not hit", | ||
| args: args{ | ||
| data: map[string][]byte{}, | ||
| fetchKeys: []string{key1, key2, key3}, | ||
| }, | ||
| want: want{ | ||
| hits: map[string][]byte{}, | ||
| }, | ||
| }, | ||
| } | ||
| s, err := miniredis.Run() | ||
| if err != nil { | ||
| testutil.Ok(t, err) | ||
| } | ||
| defer s.Close() | ||
| logger := log.NewLogfmtLogger(os.Stderr) | ||
| reg := prometheus.NewRegistry() | ||
| cfg := cacheutil.RedisClientConfig{ | ||
| Addr: s.Addr(), | ||
| DialTimeout: time.Second, | ||
| ReadTimeout: time.Second, | ||
| WriteTimeout: time.Second, | ||
| MinIdleConns: 10, | ||
| MaxConnAge: time.Minute * 10, | ||
| IdleTimeout: time.Minute * 5, | ||
| } | ||
| c, err := cacheutil.NewRedisClientWithConfig(logger, t.Name(), cfg, reg) | ||
| if err != nil { | ||
| testutil.Ok(t, err) | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| defer s.FlushAll() | ||
| c := NewRedisCache(tt.name, logger, c, reg) | ||
| // Store the cache expected before running the test. | ||
| ctx := context.Background() | ||
| c.Store(ctx, tt.args.data, time.Hour) | ||
|
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| // Fetch postings from cached and assert on it. | ||
| hits := c.Fetch(ctx, tt.args.fetchKeys) | ||
| testutil.Equals(t, tt.want.hits, hits) | ||
|
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| // Assert on metrics. | ||
| testutil.Equals(t, float64(len(tt.args.fetchKeys)), prom_testutil.ToFloat64(c.requests)) | ||
| testutil.Equals(t, float64(len(tt.want.hits)), prom_testutil.ToFloat64(c.hits)) | ||
| }) | ||
| } | ||
| } |
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