Cortex Exporter Project setup

exporters/metric/cortex/README.md

@@ -0,0 +1,4 @@
+# OpenTelemetry Go SDK Cortex Exporter
+
+Work in progress exporter to send data from the OpenTelemetry Go SDK to Cortex using the Prometheus
+Remote Write API.

exporters/metric/cortex/cortex.go

@@ -0,0 +1,36 @@
+// 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.
+
+package cortex
+
+import (
+	"context"
+
+	apimetric "go.opentelemetry.io/otel/api/metric"
+	"go.opentelemetry.io/otel/sdk/export/metric"
+	"go.opentelemetry.io/otel/sdk/export/metric/aggregation"
+)
+
+// Exporter forwards metrics to a Cortex instance
+type Exporter struct{}
+
+// ExportKindFor returns CumulativeExporter so the Processor correctly aggregates data
+func (e *Exporter) ExportKindFor(*apimetric.Descriptor, aggregation.Kind) metric.ExportKind {
+	return metric.CumulativeExporter
+}
+
+// Export forwards metrics to Cortex from the SDK
+func (e *Exporter) Export(_ context.Context, checkpointSet metric.CheckpointSet) error {
+	return nil
+}

exporters/metric/cortex/cortex_test.go

@@ -0,0 +1,32 @@
+// 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.
+
+package cortex
+
+import (
+	"testing"
+
+	"go.opentelemetry.io/otel/sdk/export/metric"
+	"go.opentelemetry.io/otel/sdk/export/metric/aggregation"
+)
+
+func TestExportKindFor(t *testing.T) {
+	exporter := Exporter{}
+	got := exporter.ExportKindFor(nil, aggregation.Kind(0))
+	want := metric.CumulativeExporter
+
+	if got != want {
+		t.Errorf("ExportKindFor() =  %q, want %q", got, want)
+	}
+}

exporters/metric/cortex/go.mod

@@ -0,0 +1,8 @@
+module go.opentelemetry.io/contrib/exporters/metric/cortex
+
+go 1.14
+
+require (
+	go.opentelemetry.io/otel v0.10.0
+	go.opentelemetry.io/otel/sdk v0.10.0
+)

exporters/metric/cortex/go.sum

@@ -0,0 +1,90 @@
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exporters/metric/cortex/sanitize.go

@@ -0,0 +1,47 @@
+// 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.
+
+package cortex
+
+import (
+	"strings"
+	"unicode"
+)
+
+// This is a copy of opentelemetry-go/sdk/internal/sanitize.go
+
+// sanitize replaces non-alphanumeric characters with underscores
+func sanitize(s string) string {
+	if len(s) == 0 {
+		return s
+	}
+
+	s = strings.Map(sanitizeRune, s)
+	if unicode.IsDigit(rune(s[0])) {
+		s = "key_" + s
+	}
+	if s[0] == '_' {
+		s = "key" + s
+	}
+	return s
+}
+
+// converts anything that is not a letter or digit to an underscore
+func sanitizeRune(r rune) rune {
+	if unicode.IsLetter(r) || unicode.IsDigit(r) {
+		return r
+	}
+	// Everything else turns into an underscore
+	return '_'
+}

exporters/metric/cortex/sanitize_test.go

@@ -0,0 +1,66 @@
+// 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.
+
+package cortex
+
+import (
+	"testing"
+)
+
+func TestSanitize(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{
+			name:  "replace character",
+			input: "test/key-1",
+			want:  "test_key_1",
+		},
+		{
+			name:  "add prefix if starting with digit",
+			input: "0123456789",
+			want:  "key_0123456789",
+		},
+		{
+			name:  "add prefix if starting with _",
+			input: "_0123456789",
+			want:  "key_0123456789",
+		},
+		{
+			name:  "starts with _ after sanitization",
+			input: "/0123456789",
+			want:  "key_0123456789",
+		},
+		{
+			name:  "valid input",
+			input: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_0123456789",
+			want:  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_0123456789",
+		},
+		{
+			name:  "empty string",
+			input: "",
+			want:  "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got, want := sanitize(tt.input), tt.want; got != want {
+				t.Errorf("Sanitize() = %q; want %q", got, want)
+			}
+		})
+	}
+}