forked from open-telemetry/opentelemetry-go-contrib
/
ec2.go
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/
ec2.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://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 "go.opentelemetry.io/contrib/detectors/aws/ec2"
import (
"context"
"fmt"
"net/http"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/resource"
semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
)
type config struct {
c Client
}
// newConfig returns an appropriately configured config.
func newConfig(options ...Option) *config {
c := new(config)
for _, option := range options {
option.apply(c)
}
return c
}
// Option applies an EC2 detector configuration option.
type Option interface {
apply(*config)
}
type optionFunc func(*config)
func (fn optionFunc) apply(c *config) {
fn(c)
}
// WithClient sets the ec2metadata client in config.
func WithClient(t Client) Option {
return optionFunc(func(c *config) {
c.c = t
})
}
func (cfg *config) getClient() Client {
return cfg.c
}
// resource detector collects resource information from EC2 environment.
type resourceDetector struct {
c Client
}
// Client implements methods to capture EC2 environment metadata information.
type Client interface {
Available() bool
GetInstanceIdentityDocument() (ec2metadata.EC2InstanceIdentityDocument, error)
GetMetadata(p string) (string, error)
}
// compile time assertion that resourceDetector implements the resource.Detector interface.
var _ resource.Detector = (*resourceDetector)(nil)
//NewResourceDetector returns a resource detector that will detect AWS EC2 resources.
func NewResourceDetector(opts ...Option) resource.Detector {
c := newConfig(opts...)
return &resourceDetector{c.getClient()}
}
// Detect detects associated resources when running in AWS environment.
func (detector *resourceDetector) Detect(ctx context.Context) (*resource.Resource, error) {
client, err := detector.client()
if err != nil {
return nil, err
}
if !client.Available() {
return nil, nil
}
doc, err := client.GetInstanceIdentityDocument()
if err != nil {
return nil, err
}
attributes := []attribute.KeyValue{
semconv.CloudProviderAWS,
semconv.CloudPlatformAWSEC2,
semconv.CloudRegionKey.String(doc.Region),
semconv.CloudAvailabilityZoneKey.String(doc.AvailabilityZone),
semconv.CloudAccountIDKey.String(doc.AccountID),
semconv.HostIDKey.String(doc.InstanceID),
semconv.HostImageIDKey.String(doc.ImageID),
semconv.HostTypeKey.String(doc.InstanceType),
}
m := &metadata{client: client}
m.add(semconv.HostNameKey, "hostname")
attributes = append(attributes, m.attributes...)
if len(m.errs) > 0 {
err = fmt.Errorf("%w: %s", resource.ErrPartialResource, m.errs)
}
return resource.NewWithAttributes(semconv.SchemaURL, attributes...), err
}
func (detector *resourceDetector) client() (Client, error) {
if detector.c != nil {
return detector.c, nil
}
s, err := session.NewSession()
if err != nil {
return nil, err
}
return ec2metadata.New(s), nil
}
type metadata struct {
client Client
errs []error
attributes []attribute.KeyValue
}
func (m *metadata) add(k attribute.Key, n string) {
v, err := m.client.GetMetadata(n)
if err == nil {
m.attributes = append(m.attributes, k.String(v))
return
}
rf, ok := err.(awserr.RequestFailure)
if !ok {
m.errs = append(m.errs, fmt.Errorf("%q: %w", n, err))
return
}
if rf.StatusCode() == http.StatusNotFound {
return
}
m.errs = append(m.errs, fmt.Errorf("%q: %d %s", n, rf.StatusCode(), rf.Code()))
}