107 lines
3.1 KiB
Go
107 lines
3.1 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gcp
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import (
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"context"
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"fmt"
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"os"
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"strings"
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"cloud.google.com/go/compute/metadata"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/sdk/resource"
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semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
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)
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// GCE collects resource information of GCE computing instances
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type GCE struct{}
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// compile time assertion that GCE implements the resource.Detector interface.
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var _ resource.Detector = (*GCE)(nil)
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// Detect detects associated resources when running on GCE hosts.
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func (gce *GCE) Detect(ctx context.Context) (*resource.Resource, error) {
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if !metadata.OnGCE() {
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return nil, nil
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}
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attributes := []attribute.KeyValue{
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semconv.CloudProviderGCP,
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}
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var errInfo []string
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if projectID, err := metadata.ProjectID(); hasProblem(err) {
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errInfo = append(errInfo, err.Error())
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} else if projectID != "" {
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attributes = append(attributes, semconv.CloudAccountIDKey.String(projectID))
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}
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if zone, err := metadata.Zone(); hasProblem(err) {
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errInfo = append(errInfo, err.Error())
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} else if zone != "" {
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attributes = append(attributes, semconv.CloudAvailabilityZoneKey.String(zone))
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splitArr := strings.SplitN(zone, "-", 3)
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if len(splitArr) == 3 {
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semconv.CloudRegionKey.String(strings.Join(splitArr[0:2], "-"))
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}
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}
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if instanceID, err := metadata.InstanceID(); hasProblem(err) {
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errInfo = append(errInfo, err.Error())
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} else if instanceID != "" {
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attributes = append(attributes, semconv.HostIDKey.String(instanceID))
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}
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if name, err := metadata.InstanceName(); hasProblem(err) {
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errInfo = append(errInfo, err.Error())
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} else if name != "" {
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attributes = append(attributes, semconv.HostNameKey.String(name))
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}
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if hostname, err := os.Hostname(); hasProblem(err) {
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errInfo = append(errInfo, err.Error())
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} else if hostname != "" {
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attributes = append(attributes, semconv.HostNameKey.String(hostname))
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}
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if hostType, err := metadata.Get("instance/machine-type"); hasProblem(err) {
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errInfo = append(errInfo, err.Error())
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} else if hostType != "" {
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attributes = append(attributes, semconv.HostTypeKey.String(hostType))
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}
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var aggregatedErr error
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if len(errInfo) > 0 {
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aggregatedErr = fmt.Errorf("detecting GCE resources: %s", errInfo)
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}
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return resource.NewWithAttributes(semconv.SchemaURL, attributes...), aggregatedErr
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}
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// hasProblem checks if the err is not nil or for missing resources
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func hasProblem(err error) bool {
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if err == nil {
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return false
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}
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if _, undefined := err.(metadata.NotDefinedError); undefined {
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return false
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}
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return true
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}
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