diff --git a/.golangci.yml b/.golangci.yml index d15b5ac..53ce42a 100644 --- a/.golangci.yml +++ b/.golangci.yml @@ -24,3 +24,4 @@ linters: - errorlint - cyclop - forcetypeassert + - forbidigo diff --git a/command.go b/command.go index 33e3a12..0079b59 100644 --- a/command.go +++ b/command.go @@ -216,7 +216,11 @@ func (cmd *Cmd) Text() (string, error) { if cmd.err != nil { return "", cmd.err } - switch val := cmd.val.(type) { + return toString(cmd.val) +} + +func toString(val interface{}) (string, error) { + switch val := val.(type) { case string: return val, nil default: @@ -244,7 +248,11 @@ func (cmd *Cmd) Int64() (int64, error) { if cmd.err != nil { return 0, cmd.err } - switch val := cmd.val.(type) { + return toInt64(cmd.val) +} + +func toInt64(val interface{}) (int64, error) { + switch val := val.(type) { case int64: return val, nil case string: @@ -259,7 +267,11 @@ func (cmd *Cmd) Uint64() (uint64, error) { if cmd.err != nil { return 0, cmd.err } - switch val := cmd.val.(type) { + return toUint64(cmd.val) +} + +func toUint64(val interface{}) (uint64, error) { + switch val := val.(type) { case int64: return uint64(val), nil case string: @@ -274,7 +286,11 @@ func (cmd *Cmd) Float32() (float32, error) { if cmd.err != nil { return 0, cmd.err } - switch val := cmd.val.(type) { + return toFloat32(cmd.val) +} + +func toFloat32(val interface{}) (float32, error) { + switch val := val.(type) { case int64: return float32(val), nil case string: @@ -293,7 +309,11 @@ func (cmd *Cmd) Float64() (float64, error) { if cmd.err != nil { return 0, cmd.err } - switch val := cmd.val.(type) { + return toFloat64(cmd.val) +} + +func toFloat64(val interface{}) (float64, error) { + switch val := val.(type) { case int64: return float64(val), nil case string: @@ -308,7 +328,11 @@ func (cmd *Cmd) Bool() (bool, error) { if cmd.err != nil { return false, cmd.err } - switch val := cmd.val.(type) { + return toBool(cmd.val) +} + +func toBool(val interface{}) (bool, error) { + switch val := val.(type) { case int64: return val != 0, nil case string: @@ -331,6 +355,108 @@ func (cmd *Cmd) Slice() ([]interface{}, error) { } } +func (cmd *Cmd) StringSlice() ([]string, error) { + slice, err := cmd.Slice() + if err != nil { + return nil, err + } + + ss := make([]string, len(slice)) + for i, iface := range slice { + val, err := toString(iface) + if err != nil { + return nil, err + } + ss[i] = val + } + return ss, nil +} + +func (cmd *Cmd) Int64Slice() ([]int64, error) { + slice, err := cmd.Slice() + if err != nil { + return nil, err + } + + nums := make([]int64, len(slice)) + for i, iface := range slice { + val, err := toInt64(iface) + if err != nil { + return nil, err + } + nums[i] = val + } + return nums, nil +} + +func (cmd *Cmd) Uint64Slice() ([]uint64, error) { + slice, err := cmd.Slice() + if err != nil { + return nil, err + } + + nums := make([]uint64, len(slice)) + for i, iface := range slice { + val, err := toUint64(iface) + if err != nil { + return nil, err + } + nums[i] = val + } + return nums, nil +} + +func (cmd *Cmd) Float32Slice() ([]float32, error) { + slice, err := cmd.Slice() + if err != nil { + return nil, err + } + + floats := make([]float32, len(slice)) + for i, iface := range slice { + val, err := toFloat32(iface) + if err != nil { + return nil, err + } + floats[i] = val + } + return floats, nil +} + +func (cmd *Cmd) Float64Slice() ([]float64, error) { + slice, err := cmd.Slice() + if err != nil { + return nil, err + } + + floats := make([]float64, len(slice)) + for i, iface := range slice { + val, err := toFloat64(iface) + if err != nil { + return nil, err + } + floats[i] = val + } + return floats, nil +} + +func (cmd *Cmd) BoolSlice() ([]bool, error) { + slice, err := cmd.Slice() + if err != nil { + return nil, err + } + + bools := make([]bool, len(slice)) + for i, iface := range slice { + val, err := toBool(iface) + if err != nil { + return nil, err + } + bools[i] = val + } + return bools, nil +} + func (cmd *Cmd) readReply(rd *proto.Reader) (err error) { cmd.val, err = rd.ReadReply(sliceParser) return err diff --git a/example/redis-bloom/README.md b/example/redis-bloom/README.md new file mode 100644 index 0000000..e2a7542 --- /dev/null +++ b/example/redis-bloom/README.md @@ -0,0 +1,12 @@ +# RedisBloom example for go-redis + +This is an example for +[Bloom, Cuckoo, Count-Min, Top-K](https://redis.uptrace.dev/guide/bloom-cuckoo-count-min-top-k.html) +article. + +To run it, you need to compile and install +[RedisBloom](https://oss.redis.com/redisbloom/Quick_Start/#building) module: + +```shell +go run . +``` diff --git a/example/redis-bloom/go.mod b/example/redis-bloom/go.mod new file mode 100644 index 0000000..0f5472f --- /dev/null +++ b/example/redis-bloom/go.mod @@ -0,0 +1,7 @@ +module github.com/go-redis/redis/example/redis-bloom + +go 1.14 + +replace github.com/go-redis/redis/v8 => ../.. + +require github.com/go-redis/redis/v8 v8.11.3 diff --git a/example/redis-bloom/go.sum b/example/redis-bloom/go.sum 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h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= diff --git a/example/redis-bloom/main.go b/example/redis-bloom/main.go new file mode 100644 index 0000000..c2ae7c0 --- /dev/null +++ b/example/redis-bloom/main.go @@ -0,0 +1,155 @@ +package main + +import ( + "context" + "fmt" + "math/rand" + + "github.com/go-redis/redis/v8" +) + +func main() { + ctx := context.Background() + + rdb := redis.NewClient(&redis.Options{ + Addr: ":6379", + }) + _ = rdb.FlushDB(ctx).Err() + + fmt.Printf("# BLOOM\n") + bloomFilter(ctx, rdb) + + fmt.Printf("\n# CUCKOO\n") + cuckooFilter(ctx, rdb) + + fmt.Printf("\n# COUNT-MIN\n") + countMinSketch(ctx, rdb) + + fmt.Printf("\n# TOP-K\n") + topK(ctx, rdb) +} + +func bloomFilter(ctx context.Context, rdb *redis.Client) { + inserted, err := rdb.Do(ctx, "BF.ADD", "bf_key", "item0").Bool() + if err != nil { + panic(err) + } + if inserted { + fmt.Println("item0 was inserted") + } else { + fmt.Println("item0 already exists") + } + + for _, item := range []string{"item0", "item1"} { + exists, err := rdb.Do(ctx, "BF.EXISTS", "bf_key", item).Bool() + if err != nil { + panic(err) + } + if exists { + fmt.Printf("%s does exist\n", item) + } else { + fmt.Printf("%s does not exist\n", item) + } + } + + bools, err := rdb.Do(ctx, "BF.MADD", "bf_key", "item1", "item2", "item3").BoolSlice() + if err != nil { + panic(err) + } + fmt.Println("adding multiple items:", bools) +} + +func cuckooFilter(ctx context.Context, rdb *redis.Client) { + inserted, err := rdb.Do(ctx, "CF.ADDNX", "cf_key", "item0").Bool() + if err != nil { + panic(err) + } + if inserted { + fmt.Println("item0 was inserted") + } else { + fmt.Println("item0 already exists") + } + + for _, item := range []string{"item0", "item1"} { + exists, err := rdb.Do(ctx, "CF.EXISTS", "cf_key", item).Bool() + if err != nil { + panic(err) + } + if exists { + fmt.Printf("%s does exist\n", item) + } else { + fmt.Printf("%s does not exist\n", item) + } + } + + deleted, err := rdb.Do(ctx, "CF.DEL", "cf_key", "item0").Bool() + if err != nil { + panic(err) + } + if deleted { + fmt.Println("item0 was deleted") + } +} + +func countMinSketch(ctx context.Context, rdb *redis.Client) { + if err := rdb.Do(ctx, "CMS.INITBYPROB", "count_min", 0.001, 0.01).Err(); err != nil { + panic(err) + } + + items := []string{"item1", "item2", "item3", "item4", "item5"} + counts := make(map[string]int, len(items)) + + for i := 0; i < 10000; i++ { + n := rand.Intn(len(items)) + item := items[n] + + if err := rdb.Do(ctx, "CMS.INCRBY", "count_min", item, 1).Err(); err != nil { + panic(err) + } + counts[item]++ + } + + for item, count := range counts { + ns, err := rdb.Do(ctx, "CMS.QUERY", "count_min", item).Int64Slice() + if err != nil { + panic(err) + } + fmt.Printf("%s: count-min=%d actual=%d\n", item, ns[0], count) + } +} + +func topK(ctx context.Context, rdb *redis.Client) { + if err := rdb.Do(ctx, "TOPK.RESERVE", "top_items", 3).Err(); err != nil { + panic(err) + } + + counts := map[string]int{ + "item1": 1000, + "item2": 2000, + "item3": 3000, + "item4": 4000, + "item5": 5000, + "item6": 6000, + } + + for item, count := range counts { + for i := 0; i < count; i++ { + if err := rdb.Do(ctx, "TOPK.INCRBY", "top_items", item, 1).Err(); err != nil { + panic(err) + } + } + } + + items, err := rdb.Do(ctx, "TOPK.LIST", "top_items").StringSlice() + if err != nil { + panic(err) + } + + for _, item := range items { + ns, err := rdb.Do(ctx, "TOPK.COUNT", "top_items", item).Int64Slice() + if err != nil { + panic(err) + } + fmt.Printf("%s: top-k=%d actual=%d\n", item, ns[0], counts[item]) + } +}