/
gce.go
106 lines (87 loc) · 3.07 KB
/
gce.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
// 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 gcp
import (
"context"
"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/v1.4.0"
)
// GCE collects resource information of GCE computing instances
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.ProjectID(); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if projectID != "" {
attributes = append(attributes, semconv.CloudAccountIDKey.String(projectID))
}
if zone, err := metadata.Zone(); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if zone != "" {
attributes = append(attributes, semconv.CloudAvailabilityZoneKey.String(zone))
splitArr := strings.SplitN(zone, "-", 3)
if len(splitArr) == 3 {
semconv.CloudRegionKey.String(strings.Join(splitArr[0:2], "-"))
}
}
if instanceID, err := metadata.InstanceID(); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if instanceID != "" {
attributes = append(attributes, semconv.HostIDKey.String(instanceID))
}
if name, err := metadata.InstanceName(); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if name != "" {
attributes = append(attributes, semconv.HostNameKey.String(name))
}
if hostname, err := os.Hostname(); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if hostname != "" {
attributes = append(attributes, semconv.HostNameKey.String(hostname))
}
if hostType, err := metadata.Get("instance/machine-type"); hasProblem(err) {
errInfo = append(errInfo, err.Error())
} else if hostType != "" {
attributes = append(attributes, semconv.HostTypeKey.String(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
}
if _, undefined := err.(metadata.NotDefinedError); undefined {
return false
}
return true
}