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ec2.go
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ec2.go
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// Copyright 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 ec2
import (
"fmt"
"strings"
"go.opentelemetry.io/collector/pdata/pcommon"
conventions "go.opentelemetry.io/collector/semconv/v1.6.1"
)
var (
defaultPrefixes = [3]string{"ip-", "domu", "ec2amaz-"}
ec2TagPrefix = "ec2.tag."
clusterTagPrefix = ec2TagPrefix + "kubernetes.io/cluster/"
)
// HostInfo holds the EC2 host information.
type HostInfo struct {
InstanceID string
EC2Hostname string
EC2Tags []string
}
// isDefaultHostname checks if a hostname is an EC2 default
func isDefaultHostname(hostname string) bool {
for _, val := range defaultPrefixes {
if strings.HasPrefix(hostname, val) {
return true
}
}
return false
}
// HostnameFromAttrs gets a valid hostname from labels
// if available
func HostnameFromAttrs(attrs pcommon.Map) (string, bool) {
if hostID, ok := attrs.Get(conventions.AttributeHostID); ok {
return hostID.Str(), true
}
return "", false
}
// HostInfoFromAttributes gets EC2 host info from attributes following
// OpenTelemetry semantic conventions
func HostInfoFromAttributes(attrs pcommon.Map) (hostInfo *HostInfo) {
hostInfo = &HostInfo{}
if hostID, ok := attrs.Get(conventions.AttributeHostID); ok {
hostInfo.InstanceID = hostID.Str()
}
if hostName, ok := attrs.Get(conventions.AttributeHostName); ok {
hostInfo.EC2Hostname = hostName.Str()
}
attrs.Range(func(k string, v pcommon.Value) bool {
if strings.HasPrefix(k, ec2TagPrefix) {
tag := fmt.Sprintf("%s:%s", strings.TrimPrefix(k, ec2TagPrefix), v.Str())
hostInfo.EC2Tags = append(hostInfo.EC2Tags, tag)
}
return true
})
return
}
// ClusterNameFromAttributes gets the AWS cluster name from attributes
func ClusterNameFromAttributes(attrs pcommon.Map) (clusterName string, ok bool) {
// Get cluster name from tag keys
// https://github.com/DataDog/datadog-agent/blob/1c94b11/pkg/util/ec2/ec2.go#L238
attrs.Range(func(k string, _ pcommon.Value) bool {
if strings.HasPrefix(k, clusterTagPrefix) {
clusterName = strings.Split(k, "/")[2]
ok = true
}
return true
})
return
}