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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package gcp // import "go.opentelemetry.io/contrib/detectors/gcp"
import (
"context"
"errors"
"fmt"
"os"
"strings"
"cloud.google.com/go/compute/metadata"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/resource"
semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
)
// GCE collects resource information of GCE computing instances.
//
// Deprecated: Use gcp.NewDetector() instead, which sets the same resource attributes on GCE.
type GCE struct{}
// compile time assertion that GCE implements the resource.Detector interface.
var _ resource.Detector = (*GCE)(nil)
// Detect detects associated resources when running on GCE hosts.
func (gce *GCE) Detect(ctx context.Context) (*resource.Resource, error) {
if !metadata.OnGCE() {
return nil, nil
}
attributes := []attribute.KeyValue{
semconv.CloudProviderGCP,
}
var errInfo []string
if projectID, err := metadata.ProjectIDWithContext(ctx); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if projectID != "" {
attributes = append(attributes, semconv.CloudAccountID(projectID))
}
if zone, err := metadata.ZoneWithContext(ctx); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if zone != "" {
attributes = append(attributes, semconv.CloudAvailabilityZone(zone))
splitArr := strings.SplitN(zone, "-", 3)
if len(splitArr) == 3 {
attributes = append(attributes, semconv.CloudRegion(strings.Join(splitArr[0:2], "-")))
}
}
if instanceID, err := metadata.InstanceIDWithContext(ctx); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if instanceID != "" {
attributes = append(attributes, semconv.HostID(instanceID))
}
if name, err := metadata.InstanceNameWithContext(ctx); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if name != "" {
attributes = append(attributes, semconv.HostName(name))
}
if hostname, err := os.Hostname(); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if hostname != "" {
attributes = append(attributes, semconv.HostName(hostname))
}
if hostType, err := metadata.GetWithContext(ctx, "instance/machine-type"); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if hostType != "" {
attributes = append(attributes, semconv.HostType(hostType))
}
var aggregatedErr error
if len(errInfo) > 0 {
aggregatedErr = fmt.Errorf("detecting GCE resources: %s", errInfo)
}
return resource.NewWithAttributes(semconv.SchemaURL, attributes...), aggregatedErr
}
// hasProblem checks if the err is not nil or for missing resources.
func hasProblem(err error) bool {
if err == nil {
return false
}
var nde metadata.NotDefinedError
if undefined := errors.As(err, &nde); undefined {
return false
}
return true
}
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