Merge pull request #1909 from go-redis/feature/slice-helpers

feat: add Cmd.{String,Int,Float,Bool}Slice helpers and an example
redis · Sep 27, 2021 · cc09f96 · cc09f96
2 parents 329d87f + 5d3d293
commit cc09f96
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Showing 6 changed files with 407 additions and 6 deletions.
diff --git a/.golangci.yml b/.golangci.yml
@@ -24,3 +24,4 @@ linters:
     - errorlint
     - cyclop
     - forcetypeassert
+    - forbidigo
diff --git 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
@@ -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
@@ -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
@@ -0,0 +1,100 @@
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