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client.go
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client.go
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package aws
import (
"sync"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
"time"
)
type awsclient struct {
sess *session.Session
metaData *ec2metadata.EC2Metadata
idDoc *ec2metadata.EC2InstanceIdentityDocument
onceIDDoc sync.Once
ec2Client ec2iface.EC2API
onceEc2 sync.Once
}
type combinedClient struct {
*subnetsCacheClient
*awsclient
*interfaceClient
*allocateClient
*vpcCacheClient
}
// Client offers all of the supporting AWS services
type Client interface {
InterfaceClient
LimitsClient
MetadataClient
SubnetsClient
AllocateClient
VPCClient
}
var defaultClient *combinedClient
// DefaultClient that is setup with known defaults
var DefaultClient Client
func init() {
awsClient := &awsclient{}
subnets := &subnetsCacheClient{
&subnetsClient{aws: awsClient},
5 * time.Minute,
}
defaultClient = &combinedClient{
subnets,
awsClient,
&interfaceClient{awsClient, subnets},
&allocateClient{awsClient, subnets},
&vpcCacheClient{
&vpcclient{awsClient},
1 * time.Hour,
},
}
DefaultClient = defaultClient
defaultClient.sess = session.Must(session.NewSession())
defaultClient.metaData = ec2metadata.New(defaultClient.sess)
}
func (c *awsclient) getIDDoc() (*ec2metadata.EC2InstanceIdentityDocument, error) {
var err error
c.onceIDDoc.Do(func() {
// Allow mock ID documents to be inserted
if c.idDoc == nil {
var instance ec2metadata.EC2InstanceIdentityDocument
instance, err = c.metaData.GetInstanceIdentityDocument()
if err != nil {
return
}
// Cache the document
c.idDoc = &instance
}
})
return c.idDoc, err
}
// Allocate a new EC2 client configured for the current instance
// region. Clients are re-used across multiple calls
func (c *awsclient) newEC2() (ec2iface.EC2API, error) {
var err error
c.onceEc2.Do(func() {
var id *ec2metadata.EC2InstanceIdentityDocument
id, err = c.getIDDoc()
if err != nil {
return
}
if c.ec2Client == nil {
// Use the sess object already defined
c.ec2Client = ec2.New(c.sess, aws.NewConfig().WithRegion(id.Region))
}
})
return c.ec2Client, err
}