Fix slice-valued attributes when used as map keys

Signed-off-by: Anthony J Mirabella <a9@aneurysm9.com>

CHANGELOG.md

@@ -8,6 +8,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Fixed
+
+- Slice-valued attributes can correctly be used as map keys. (#2223)
+
 ## [1.0.0-RC3] - 2021-09-02
 
 ### Added

attribute/value.go

@@ -73,12 +73,7 @@ func BoolValue(v bool) Value {
 
 // BoolSliceValue creates a BOOLSLICE Value.
 func BoolSliceValue(v []bool) Value {
-	cp := make([]bool, len(v))
-	copy(cp, v)
-	return Value{
-		vtype: BOOLSLICE,
-		slice: cp,
-	}
+	return sliceValue(v, BOOLSLICE)
 }
 
 // IntValue creates an INT64 Value.
@@ -88,14 +83,7 @@ func IntValue(v int) Value {
 
 // IntSliceValue creates an INTSLICE Value.
 func IntSliceValue(v []int) Value {
-	cp := make([]int64, 0, len(v))
-	for _, i := range v {
-		cp = append(cp, int64(i))
-	}
-	return Value{
-		vtype: INT64SLICE,
-		slice: cp,
-	}
+	return sliceValue(v, INT64SLICE)
 }
 
 // Int64Value creates an INT64 Value.
@@ -108,12 +96,7 @@ func Int64Value(v int64) Value {
 
 // Int64SliceValue creates an INT64SLICE Value.
 func Int64SliceValue(v []int64) Value {
-	cp := make([]int64, len(v))
-	copy(cp, v)
-	return Value{
-		vtype: INT64SLICE,
-		slice: cp,
-	}
+	return sliceValue(v, INT64SLICE)
 }
 
 // Float64Value creates a FLOAT64 Value.
@@ -126,12 +109,7 @@ func Float64Value(v float64) Value {
 
 // Float64SliceValue creates a FLOAT64SLICE Value.
 func Float64SliceValue(v []float64) Value {
-	cp := make([]float64, len(v))
-	copy(cp, v)
-	return Value{
-		vtype: FLOAT64SLICE,
-		slice: cp,
-	}
+	return sliceValue(v, FLOAT64SLICE)
 }
 
 // StringValue creates a STRING Value.
@@ -144,11 +122,26 @@ func StringValue(v string) Value {
 
 // StringSliceValue creates a STRINGSLICE Value.
 func StringSliceValue(v []string) Value {
-	cp := make([]string, len(v))
-	copy(cp, v)
-	return Value{
-		vtype: STRINGSLICE,
-		slice: cp,
+	return sliceValue(v, STRINGSLICE)
+}
+
+func sliceValue(v interface{}, vtype Type) Value {
+	// get array type regardless of dimensions
+	typ := reflect.TypeOf(v).Elem()
+	kind := typ.Kind()
+	switch kind {
+	case reflect.Bool, reflect.Int, reflect.Int64,
+		reflect.Float64, reflect.String:
+		val := reflect.ValueOf(v)
+		length := val.Len()
+		frozen := reflect.Indirect(reflect.New(reflect.ArrayOf(length, typ)))
+		reflect.Copy(frozen, val)
+		return Value{
+			vtype: vtype,
+			slice: frozen.Interface(),
+		}
+	default:
+		return Value{vtype: INVALID}
 	}
 }
 
@@ -162,23 +155,7 @@ func StringSliceValue(v []string) Value {
 func ArrayValue(v interface{}) Value {
 	switch reflect.TypeOf(v).Kind() {
 	case reflect.Array, reflect.Slice:
-		// get array type regardless of dimensions
-		typ := reflect.TypeOf(v).Elem()
-		kind := typ.Kind()
-		switch kind {
-		case reflect.Bool, reflect.Int, reflect.Int64,
-			reflect.Float64, reflect.String:
-			val := reflect.ValueOf(v)
-			length := val.Len()
-			frozen := reflect.Indirect(reflect.New(reflect.ArrayOf(length, typ)))
-			reflect.Copy(frozen, val)
-			return Value{
-				vtype: ARRAY,
-				slice: frozen.Interface(),
-			}
-		default:
-			return Value{vtype: INVALID}
-		}
+		return sliceValue(v, ARRAY)
 	}
 	return Value{vtype: INVALID}
 }
@@ -197,10 +174,15 @@ func (v Value) AsBool() bool {
 // AsBoolSlice returns the []bool value. Make sure that the Value's type is
 // BOOLSLICE.
 func (v Value) AsBoolSlice() []bool {
-	if s, ok := v.slice.([]bool); ok {
-		return s
+	if v.vtype != BOOLSLICE {
+		return nil
 	}
-	return nil
+	r := []bool{}
+	s := reflect.ValueOf(v.slice)
+	for i := 0; i < s.Len(); i++ {
+		r = append(r, s.Index(i).Bool())
+	}
+	return r
 }
 
 // AsInt64 returns the int64 value. Make sure that the Value's type is
@@ -212,10 +194,15 @@ func (v Value) AsInt64() int64 {
 // AsInt64Slice returns the []int64 value. Make sure that the Value's type is
 // INT64SLICE.
 func (v Value) AsInt64Slice() []int64 {
-	if s, ok := v.slice.([]int64); ok {
-		return s
+	if v.vtype != INT64SLICE {
+		return nil
+	}
+	r := []int64{}
+	s := reflect.ValueOf(v.slice)
+	for i := 0; i < s.Len(); i++ {
+		r = append(r, s.Index(i).Int())
 	}
-	return nil
+	return r
 }
 
 // AsFloat64 returns the float64 value. Make sure that the Value's
@@ -227,10 +214,15 @@ func (v Value) AsFloat64() float64 {
 // AsFloat64Slice returns the []float64 value. Make sure that the Value's type is
 // INT64SLICE.
 func (v Value) AsFloat64Slice() []float64 {
-	if s, ok := v.slice.([]float64); ok {
-		return s
+	if v.vtype != FLOAT64SLICE {
+		return nil
 	}
-	return nil
+	r := []float64{}
+	s := reflect.ValueOf(v.slice)
+	for i := 0; i < s.Len(); i++ {
+		r = append(r, s.Index(i).Float())
+	}
+	return r
 }
 
 // AsString returns the string value. Make sure that the Value's type
@@ -242,10 +234,15 @@ func (v Value) AsString() string {
 // AsStringSlice returns the []string value. Make sure that the Value's type is
 // INT64SLICE.
 func (v Value) AsStringSlice() []string {
-	if s, ok := v.slice.([]string); ok {
-		return s
+	if v.vtype != STRINGSLICE {
+		return nil
+	}
+	r := []string{}
+	s := reflect.ValueOf(v.slice)
+	for i := 0; i < s.Len(); i++ {
+		r = append(r, s.Index(i).String())
 	}
-	return nil
+	return r
 }
 
 // AsArray returns the array Value as an interface{}.

exporters/otlp/otlptrace/internal/tracetransform/span_test.go

@@ -266,7 +266,7 @@ func TestSpanData(t *testing.T) {
 		DroppedAttributes: 1,
 		DroppedEvents:     2,
 		DroppedLinks:      3,
-		Resource:          resource.NewSchemaless(attribute.String("rk1", "rv1"), attribute.Int64("rk2", 5)),
+		Resource:          resource.NewSchemaless(attribute.String("rk1", "rv1"), attribute.Int64("rk2", 5), attribute.StringSlice("rk3", []string{"sv1", "sv2"})),
 		InstrumentationLibrary: instrumentation.Library{
 			Name:    "go.opentelemetry.io/test/otel",
 			Version: "v0.0.1",