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package resource
import (
"fmt"
"strings"
"sync"
"time"
)
const UniqueIdPrefix = `terraform-`
// idCounter is a monotonic counter for generating ordered unique ids.
var idMutex sync.Mutex
var idCounter uint32
// Helper for a resource to generate a unique identifier w/ default prefix
func UniqueId() string {
return PrefixedUniqueId(UniqueIdPrefix)
}
// Helper for a resource to generate a unique identifier w/ given prefix
//
// After the prefix, the ID consists of an incrementing 26 digit value (to match
// previous timestamp output). After the prefix, the ID consists of a timestamp
// and an incrementing 8 hex digit value The timestamp means that multiple IDs
// created with the same prefix will sort in the order of their creation, even
// across multiple terraform executions, as long as the clock is not turned back
// between calls, and as long as any given terraform execution generates fewer
// than 4 billion IDs.
func PrefixedUniqueId(prefix string) string {
// Be precise to 4 digits of fractional seconds, but remove the dot before the
// fractional seconds.
timestamp := strings.Replace(
time.Now().UTC().Format("20060102150405.0000"), ".", "", 1)
idMutex.Lock()
defer idMutex.Unlock()
idCounter++
return fmt.Sprintf("%s%s%08x", prefix, timestamp, idCounter)
}
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