Struct callCreds

credentials/sts/sts.go:139–148

callCreds provides the implementation of call credentials based on an STS token exchange.

// callCreds provides the implementation of call credentials based on an STS
// token exchange.
type callCreds struct {
	opts   Options
	client httpDoer

	// Cached accessToken to avoid an STS token exchange for every call to
	// GetRequestMetadata.
	mu            sync.Mutex
	tokenMetadata map[string]string
	tokenExpiry   time.Time
}

// GetRequestMetadata returns the cached accessToken, if available and valid, or
// fetches a new one by performing an STS token exchange.