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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package datastore | ||
|
|
||
| import ( | ||
| "context" | ||
| "database/sql/driver" | ||
| "fmt" | ||
| "net/url" | ||
| "os" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/aws/aws-sdk-go-v2/config" | ||
| "github.com/aws/aws-sdk-go-v2/feature/rds/auth" | ||
| "github.com/jackc/pgx/stdlib" | ||
| ) | ||
|
|
||
| const defaultRegion = "us-west-2" | ||
|
|
||
| const ( | ||
| rdsPortKey = "RDS_DATABASE_PORT" | ||
| rdsHostKey = "RDS_WRITER_ENDPOINT" | ||
| rdsUserKey = "RDS_USER" | ||
| rdsDbNameKey = "RDS_DATABASE_NAME" | ||
| regionKey = "AWS_REGION" | ||
| ) | ||
|
|
||
| type rdsConnector struct { | ||
| hostAndPort string | ||
| dbName string | ||
| user string | ||
| token string | ||
| region string | ||
| tokenCacheTime time.Time | ||
| mu sync.Mutex | ||
| } | ||
|
|
||
| func newRDSConnector() *rdsConnector { | ||
| port := os.Getenv(rdsPortKey) | ||
| host := os.Getenv(rdsHostKey) | ||
| user := os.Getenv(rdsUserKey) | ||
| dbName := os.Getenv(rdsDbNameKey) | ||
| region := os.Getenv(regionKey) | ||
|
|
||
| if region == "" { | ||
| region = defaultRegion | ||
| } | ||
| hostAndPort := fmt.Sprintf("%s:%s", host, port) | ||
| return &rdsConnector{ | ||
| hostAndPort: hostAndPort, | ||
| dbName: dbName, | ||
| user: user, | ||
| region: region, | ||
| } | ||
| } | ||
|
|
||
| func (c *rdsConnector) getConnectionString(ctx context.Context) (string, error) { | ||
| c.mu.Lock() | ||
| defer c.mu.Unlock() | ||
|
|
||
| if time.Since(c.tokenCacheTime) > 10*time.Minute { | ||
| cfg, err := config.LoadDefaultConfig(ctx) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to load AWS config") | ||
| } | ||
|
|
||
| token, err := auth.BuildAuthToken( | ||
| ctx, c.hostAndPort, c.region, c.user, cfg.Credentials) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to create authentication token: %w", err) | ||
| } | ||
| c.token = url.QueryEscape(token) | ||
| c.tokenCacheTime = time.Now() | ||
| } | ||
|
|
||
| return fmt.Sprintf("postgres://%s:%s@%s/%s?sslmode=require", c.user, c.token, c.hostAndPort, c.dbName), nil | ||
| } | ||
|
|
||
| func (c *rdsConnector) Connect(ctx context.Context) (driver.Conn, error) { | ||
| connStr, err := c.getConnectionString(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return stdlib.GetDefaultDriver().Open(connStr) | ||
| } | ||
|
|
||
| func (c *rdsConnector) Driver() driver.Driver { | ||
| return c | ||
| } | ||
|
|
||
| func (c *rdsConnector) Open(_ string) (driver.Conn, error) { | ||
| return nil, fmt.Errorf("open method unsupported") | ||
| } |
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