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package cache_lib_test
import (
"context"
"encoding/json"
"errors"
"testing"
"time"
"github.com/go-redis/redis/v8"
"github.com/go-redis/redismock/v8"
"github.com/stretchr/testify/assert"
cache_lib "github.com/honestbank/cache-lib-go"
)
type Response struct {
Result bool `json:"result"`
}
func TestNewCache(t *testing.T) {
a := assert.New(t)
db, _ := redismock.NewClientMock()
cache := cache_lib.NewCache[Response](db, nil)
a.NotNil(cache)
}
func TestCache_RememberBlocking(t *testing.T) {
t.Run("happy path - cache miss then fetch", func(t *testing.T) {
a := assert.New(t)
db, mock := redismock.NewClientMock()
cache := cache_lib.NewCache[Response](db, nil)
response := Response{Result: true}
responseString, _ := json.Marshal(response)
mock.ExpectGet("data").SetVal("")
mock.ExpectSetNX("data", "", 1*time.Second).SetVal(true)
mock.ExpectSet("data", string(responseString), 1*time.Second).SetVal(string(responseString))
mock.ExpectPublish("data", string(responseString)).SetVal(1)
result, err := cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
a.NoError(err)
a.Equal(response, *result)
})
t.Run("setNX error - falls back to missFn", func(t *testing.T) {
a := assert.New(t)
db, mock := redismock.NewClientMock()
cache := cache_lib.NewCache[Response](db, nil)
response := Response{Result: true}
mock.ExpectGet("data").SetVal("")
mock.ExpectSetNX("data", "", 1*time.Second).SetErr(errors.New("redis unavailable"))
result, err := cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
a.NoError(err)
a.Equal(response, *result)
})
t.Run("set error after missFn - releases lock, notifies waiters, returns data", func(t *testing.T) {
a := assert.New(t)
db, mock := redismock.NewClientMock()
cache := cache_lib.NewCache[Response](db, nil)
response := Response{Result: true}
responseString, _ := json.Marshal(response)
mock.ExpectGet("data").SetVal("")
mock.ExpectSetNX("data", "", 1*time.Second).SetVal(true)
mock.ExpectSet("data", string(responseString), 1*time.Second).SetErr(errors.New("redis unavailable"))
mock.ExpectDel("data").SetVal(1)
mock.ExpectPublish("data", string(responseString)).SetVal(1)
result, err := cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
a.NoError(err)
a.Equal(response, *result)
a.NoError(mock.ExpectationsWereMet())
})
t.Run("publish error after missFn - returns data without error", func(t *testing.T) {
a := assert.New(t)
db, mock := redismock.NewClientMock()
cache := cache_lib.NewCache[Response](db, nil)
response := Response{Result: true}
responseString, _ := json.Marshal(response)
mock.ExpectGet("data").SetVal("")
mock.ExpectSetNX("data", "", 1*time.Second).SetVal(true)
mock.ExpectSet("data", string(responseString), 1*time.Second).SetVal("OK")
mock.ExpectPublish("data", string(responseString)).SetErr(errors.New("redis unavailable"))
result, err := cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
a.NoError(err)
a.Equal(response, *result)
})
t.Run("missFn error - releases lock, signals subscribers to retry, propagates error", func(t *testing.T) {
a := assert.New(t)
db, mock := redismock.NewClientMock()
cache := cache_lib.NewCache[Response](db, nil)
mock.ExpectGet("data").SetVal("")
mock.ExpectSetNX("data", "", 1*time.Second).SetVal(true)
mock.ExpectDel("data").SetVal(1)
mock.ExpectPublish("data", "retry").SetVal(0)
result, err := cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
return nil, errors.New("upstream failed")
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
a.Error(err)
a.Nil(result)
a.NoError(mock.ExpectationsWereMet())
})
}
func TestNewCacheSubscription(t *testing.T) {
redisClient := redis.NewClient(&redis.Options{
Addr: ":6379", // We connect to host redis, thats what the hostname of the redis service is set to in the docker-compose
DB: 0,
})
cache := cache_lib.NewCache[Response](redisClient, nil)
t.Run("Multiple calls", func(t *testing.T) {
a := assert.New(t)
response := Response{Result: true}
go func() {
_, _ = cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
time.Sleep(2 * time.Second)
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
}()
result, err := cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
time.Sleep(2 * time.Second)
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
a.NoError(err)
a.Equal(response, *result)
})
}
func TestNewCacheSubscriptionWithOptions(t *testing.T) {
redisClient := redis.NewClient(&redis.Options{
Addr: ":6379", // We connect to host redis, thats what the hostname of the redis service is set to in the docker-compose
DB: 0,
})
cache := cache_lib.NewCache[Response](redisClient, &cache_lib.CacheOptions{
SubscriptionTimeout: 1 * time.Second,
UnsubscribeAndClose: true,
})
t.Run("Multiple calls", func(t *testing.T) {
a := assert.New(t)
response := Response{Result: true}
go func() {
_, _ = cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
time.Sleep(2 * time.Second)
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
}()
result, err := cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
time.Sleep(2 * time.Second)
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data", 1*time.Second)
a.NoError(err)
a.Equal(response, *result)
})
}
func TestRememberWait(t *testing.T) {
redisClient := redis.NewClient(&redis.Options{
Addr: ":6379", // We connect to host redis, thats what the hostname of the redis service is set to in the docker-compose
DB: 0,
})
cache := cache_lib.NewCache[Response](redisClient, &cache_lib.CacheOptions{
SubscriptionTimeout: 3 * time.Second,
UnsubscribeAndClose: true,
})
t.Run("single cache", func(t *testing.T) {
a := assert.New(t)
response := Response{Result: true}
//responseString, _ := json.Marshal(response)
go func() {
_, _ = cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
time.Sleep(2 * time.Second)
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data3", 1*time.Second)
}()
_, err := cache.RememberBlocking(context.Background(), func(ctx context.Context) (*Response, error) {
return &response, nil
}, func(ctx context.Context, data *Response) {}, "data3", 1*time.Second)
a.NoError(err)
})
}