104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
package aws
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import (
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"fmt"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/ec2"
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"github.com/hashicorp/go-cleanhttp"
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"github.com/hashicorp/vault/helper/awsutil"
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"github.com/hashicorp/vault/logical"
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)
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// getClientConfig creates a aws-sdk-go config, which is used to create client
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// that can interact with AWS API. This builds credentials in the following
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// order of preference:
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//
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// * Static credentials from 'config/client'
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// * Environment variables
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// * Instance metadata role
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func (b *backend) getClientConfig(s logical.Storage, region string) (*aws.Config, error) {
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credsConfig := &awsutil.CredentialsConfig{
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Region: region,
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}
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// Read the configured secret key and access key
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config, err := b.clientConfigEntry(s)
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if err != nil {
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return nil, err
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}
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endpoint := aws.String("")
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if config != nil {
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// Override the default endpoint with the configured endpoint.
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if config.Endpoint != "" {
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endpoint = aws.String(config.Endpoint)
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}
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credsConfig.AccessKey = config.AccessKey
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credsConfig.SecretKey = config.SecretKey
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}
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credsConfig.HTTPClient = cleanhttp.DefaultClient()
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creds, err := credsConfig.GenerateCredentialChain()
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if err != nil {
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return nil, err
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}
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if creds == nil {
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return nil, fmt.Errorf("could not compile valid credential providers from static config, environemnt, shared, or instance metadata")
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}
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// Create a config that can be used to make the API calls.
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return &aws.Config{
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Credentials: creds,
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Region: aws.String(region),
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HTTPClient: cleanhttp.DefaultClient(),
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Endpoint: endpoint,
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}, nil
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}
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// flushCachedEC2Clients deletes all the cached ec2 client objects from the backend.
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// If the client credentials configuration is deleted or updated in the backend, all
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// the cached EC2 client objects will be flushed.
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//
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// Write lock should be acquired using b.configMutex.Lock() before calling this method
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// and lock should be released using b.configMutex.Unlock() after the method returns.
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func (b *backend) flushCachedEC2Clients() {
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// deleting items in map during iteration is safe.
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for region, _ := range b.EC2ClientsMap {
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delete(b.EC2ClientsMap, region)
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}
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}
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// clientEC2 creates a client to interact with AWS EC2 API.
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func (b *backend) clientEC2(s logical.Storage, region string) (*ec2.EC2, error) {
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b.configMutex.RLock()
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if b.EC2ClientsMap[region] != nil {
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defer b.configMutex.RUnlock()
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// If the client object was already created, return it.
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return b.EC2ClientsMap[region], nil
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}
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// Release the read lock and acquire the write lock.
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b.configMutex.RUnlock()
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b.configMutex.Lock()
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defer b.configMutex.Unlock()
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// If the client gets created while switching the locks, return it.
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if b.EC2ClientsMap[region] != nil {
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return b.EC2ClientsMap[region], nil
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}
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// Create a AWS config object using a chain of providers.
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awsConfig, err := b.getClientConfig(s, region)
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if err != nil {
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return nil, err
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}
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// Create a new EC2 client object, cache it and return the same.
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b.EC2ClientsMap[region] = ec2.New(session.New(awsConfig))
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return b.EC2ClientsMap[region], nil
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}
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