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metrics_test.go
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metrics_test.go
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// 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 autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
import (
"context"
"fmt"
"io"
"net/http"
"reflect"
"testing"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/sdk/metric"
"github.com/stretchr/testify/assert"
)
func TestMetricExporterNone(t *testing.T) {
t.Setenv("OTEL_METRICS_EXPORTER", "none")
got, err := NewMetricReader(context.Background())
assert.NoError(t, err)
t.Cleanup(func() {
assert.NoError(t, got.Shutdown(context.Background()))
})
assert.True(t, IsNoneMetricReader(got))
}
func TestMetricExporterOTLP(t *testing.T) {
t.Setenv("OTEL_METRICS_EXPORTER", "otlp")
for _, tc := range []struct {
protocol, exporterType string
}{
{"http/protobuf", "*otlpmetrichttp.Exporter"},
{"", "*otlpmetrichttp.Exporter"},
{"grpc", "*otlpmetricgrpc.Exporter"},
} {
t.Run(fmt.Sprintf("protocol=%q", tc.protocol), func(t *testing.T) {
t.Setenv("OTEL_EXPORTER_OTLP_PROTOCOL", tc.protocol)
got, err := NewMetricReader(context.Background())
assert.NoError(t, err)
t.Cleanup(func() {
assert.NoError(t, got.Shutdown(context.Background()))
})
assert.IsType(t, &metric.PeriodicReader{}, got)
// Implementation detail hack. This may break when bumping OTLP exporter modules as it uses unexported API.
exporterType := reflect.Indirect(reflect.ValueOf(got)).FieldByName("exporter").Elem().Type()
assert.Equal(t, tc.exporterType, exporterType.String())
})
}
}
func TestMetricExporterOTLPOverInvalidProtocol(t *testing.T) {
t.Setenv("OTEL_METRICS_EXPORTER", "otlp")
t.Setenv("OTEL_EXPORTER_OTLP_PROTOCOL", "invalid-protocol")
_, err := NewMetricReader(context.Background())
assert.Error(t, err)
}
func TestMetricExporterPrometheus(t *testing.T) {
t.Setenv("OTEL_METRICS_EXPORTER", "prometheus")
t.Setenv("OTEL_EXPORTER_PROMETHEUS_PORT", "12345")
r, err := NewMetricReader(context.Background())
assert.NoError(t, err)
t.Cleanup(func() {
assert.NoError(t, r.Shutdown(context.Background()))
})
if _, ok := r.(*prometheus.Exporter); !ok {
t.Errorf("expected *prometheus.Exporter but got %v", r)
}
resp, err := http.Get("http://localhost:12345/metrics")
assert.NoError(t, err)
body, err := io.ReadAll(resp.Body)
assert.NoError(t, err)
assert.Contains(t, string(body), "# HELP")
}