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host_test.go
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host_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:https://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 metadata
import (
"os"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.uber.org/zap"
"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/utils/cache"
)
func TestHost(t *testing.T) {
logger := zap.NewNop()
// Start with a fresh cache, the following test would fail
// if the cache key is already set.
cache.Cache.Delete(cache.CanonicalHostnameKey)
host := GetHost(logger, "test-host")
assert.Equal(t, host, "test-host")
// config.Config.Hostname does not get stored in the cache
host = GetHost(logger, "test-host-2")
assert.Equal(t, host, "test-host-2")
// Disable EC2 Metadata service to prevent fetching hostname from there,
// in case the test is running on an EC2 instance
const awsEc2MetadataDisabled = "AWS_EC2_METADATA_DISABLED"
curr := os.Getenv(awsEc2MetadataDisabled)
err := os.Setenv(awsEc2MetadataDisabled, "true")
require.NoError(t, err)
defer os.Setenv(awsEc2MetadataDisabled, curr)
host = GetHost(logger, "")
osHostname, err := os.Hostname()
require.NoError(t, err)
// TODO: Investigate why the returned host contains more data on github actions.
assert.Contains(t, host, osHostname)
}