Add back the otlpmetric transforms

.github/dependabot.yml

@@ -100,6 +100,15 @@ updates:
     schedule:
       interval: weekly
       day: sunday
+  - package-ecosystem: gomod
+    directory: /exporters/otlp/otlpmetric
+    labels:
+      - dependencies
+      - go
+      - Skip Changelog
+    schedule:
+      interval: weekly
+      day: sunday
   - package-ecosystem: gomod
     directory: /exporters/otlp/otlptrace
     labels:

exporters/otlp/otlpmetric/go.mod

@@ -0,0 +1,33 @@
+module go.opentelemetry.io/otel/exporters/otlp/otlpmetric
+
+go 1.18
+
+require (
+	github.com/stretchr/testify v1.7.1
+	go.opentelemetry.io/otel v1.7.0
+	go.opentelemetry.io/otel/metric v0.0.0-00010101000000-000000000000
+	go.opentelemetry.io/otel/sdk v0.0.0-00010101000000-000000000000
+	go.opentelemetry.io/otel/sdk/metric v0.0.0-00010101000000-000000000000
+	go.opentelemetry.io/proto/otlp v0.18.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.opentelemetry.io/otel/trace v1.7.0 // indirect
+	golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)
+
+replace go.opentelemetry.io/otel/metric => ../../../metric
+
+replace go.opentelemetry.io/otel => ../../..
+
+replace go.opentelemetry.io/otel/sdk/metric => ../../../sdk/metric
+
+replace go.opentelemetry.io/otel/trace => ../../../trace
+
+replace go.opentelemetry.io/otel/sdk => ../../../sdk

exporters/otlp/otlpmetric/internal/transform/attribute.go

@@ -0,0 +1,155 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.18
+// +build go1.18
+
+package transform // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/transform"
+
+import (
+	"go.opentelemetry.io/otel/attribute"
+	cpb "go.opentelemetry.io/proto/otlp/common/v1"
+)
+
+// AttrIter transforms an attribute iterator into OTLP key-values.
+func AttrIter(iter attribute.Iterator) []*cpb.KeyValue {
+	l := iter.Len()
+	if l == 0 {
+		return nil
+	}
+
+	out := make([]*cpb.KeyValue, 0, l)
+	for iter.Next() {
+		out = append(out, KeyValue(iter.Attribute()))
+	}
+	return out
+}
+
+// KeyValues transforms a slice of attribute KeyValues into OTLP key-values.
+func KeyValues(attrs []attribute.KeyValue) []*cpb.KeyValue {
+	if len(attrs) == 0 {
+		return nil
+	}
+
+	out := make([]*cpb.KeyValue, 0, len(attrs))
+	for _, kv := range attrs {
+		out = append(out, KeyValue(kv))
+	}
+	return out
+}
+
+// KeyValue transforms an attribute KeyValue into an OTLP key-value.
+func KeyValue(kv attribute.KeyValue) *cpb.KeyValue {
+	return &cpb.KeyValue{Key: string(kv.Key), Value: Value(kv.Value)}
+}
+
+// Value transforms an attribute Value into an OTLP AnyValue.
+func Value(v attribute.Value) *cpb.AnyValue {
+	av := new(cpb.AnyValue)
+	switch v.Type() {
+	case attribute.BOOL:
+		av.Value = &cpb.AnyValue_BoolValue{
+			BoolValue: v.AsBool(),
+		}
+	case attribute.BOOLSLICE:
+		av.Value = &cpb.AnyValue_ArrayValue{
+			ArrayValue: &cpb.ArrayValue{
+				Values: boolSliceValues(v.AsBoolSlice()),
+			},
+		}
+	case attribute.INT64:
+		av.Value = &cpb.AnyValue_IntValue{
+			IntValue: v.AsInt64(),
+		}
+	case attribute.INT64SLICE:
+		av.Value = &cpb.AnyValue_ArrayValue{
+			ArrayValue: &cpb.ArrayValue{
+				Values: int64SliceValues(v.AsInt64Slice()),
+			},
+		}
+	case attribute.FLOAT64:
+		av.Value = &cpb.AnyValue_DoubleValue{
+			DoubleValue: v.AsFloat64(),
+		}
+	case attribute.FLOAT64SLICE:
+		av.Value = &cpb.AnyValue_ArrayValue{
+			ArrayValue: &cpb.ArrayValue{
+				Values: float64SliceValues(v.AsFloat64Slice()),
+			},
+		}
+	case attribute.STRING:
+		av.Value = &cpb.AnyValue_StringValue{
+			StringValue: v.AsString(),
+		}
+	case attribute.STRINGSLICE:
+		av.Value = &cpb.AnyValue_ArrayValue{
+			ArrayValue: &cpb.ArrayValue{
+				Values: stringSliceValues(v.AsStringSlice()),
+			},
+		}
+	default:
+		av.Value = &cpb.AnyValue_StringValue{
+			StringValue: "INVALID",
+		}
+	}
+	return av
+}
+
+func boolSliceValues(vals []bool) []*cpb.AnyValue {
+	converted := make([]*cpb.AnyValue, len(vals))
+	for i, v := range vals {
+		converted[i] = &cpb.AnyValue{
+			Value: &cpb.AnyValue_BoolValue{
+				BoolValue: v,
+			},
+		}
+	}
+	return converted
+}
+
+func int64SliceValues(vals []int64) []*cpb.AnyValue {
+	converted := make([]*cpb.AnyValue, len(vals))
+	for i, v := range vals {
+		converted[i] = &cpb.AnyValue{
+			Value: &cpb.AnyValue_IntValue{
+				IntValue: v,
+			},
+		}
+	}
+	return converted
+}
+
+func float64SliceValues(vals []float64) []*cpb.AnyValue {
+	converted := make([]*cpb.AnyValue, len(vals))
+	for i, v := range vals {
+		converted[i] = &cpb.AnyValue{
+			Value: &cpb.AnyValue_DoubleValue{
+				DoubleValue: v,
+			},
+		}
+	}
+	return converted
+}
+
+func stringSliceValues(vals []string) []*cpb.AnyValue {
+	converted := make([]*cpb.AnyValue, len(vals))
+	for i, v := range vals {
+		converted[i] = &cpb.AnyValue{
+			Value: &cpb.AnyValue_StringValue{
+				StringValue: v,
+			},
+		}
+	}
+	return converted
+}