77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
// Copyright 2016-2018, Pulumi Corporation. All rights reserved.
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package resource
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import (
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cryptorand "crypto/rand"
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"encoding/hex"
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"github.com/pkg/errors"
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"github.com/pulumi/pulumi/pkg/util/contract"
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)
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// ID is a unique resource identifier; it is managed by the provider and is mostly opaque.
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type ID string
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// String converts a resource ID into a string.
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func (id ID) String() string {
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return string(id)
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}
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// StringPtr converts an optional ID into an optional string.
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func (id *ID) StringPtr() *string {
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if id == nil {
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return nil
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}
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ids := (*id).String()
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return &ids
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}
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// IDStrings turns an array of resource IDs into an array of strings.
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func IDStrings(ids []ID) []string {
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ss := make([]string, len(ids))
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for i, id := range ids {
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ss[i] = id.String()
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}
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return ss
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}
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// MaybeID turns an optional string into an optional resource ID.
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func MaybeID(s *string) *ID {
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var ret *ID
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if s != nil {
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id := ID(*s)
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ret = &id
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}
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return ret
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}
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// NewUniqueHex generates a new "random" hex string for use by resource providers. It will take the optional prefix
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// and append randlen random characters (defaulting to 8 if not > 0). The result must not exceed maxlen total
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// characterss (if > 0). Note that capping to maxlen necessarily increases the risk of collisions.
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func NewUniqueHex(prefix string, randlen, maxlen int) (string, error) {
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if randlen <= 0 {
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randlen = 8
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}
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if maxlen > 0 && len(prefix)+randlen > maxlen {
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return "", errors.Errorf(
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"name '%s' plus %d random chars is longer than maximum length %d", prefix, randlen, maxlen)
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}
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bs := make([]byte, randlen+1/2)
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n, err := cryptorand.Read(bs)
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contract.AssertNoError(err)
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contract.Assert(n == len(bs))
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return prefix + hex.EncodeToString(bs)[:randlen], nil
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}
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// NewUniqueHexID generates a new "random" hex string for use by resource providers. It will take the optional prefix
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// and append randlen random characters (defaulting to 8 if not > 0). The result must not exceed maxlen total
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// characterss (if > 0). Note that capping to maxlen necessarily increases the risk of collisions.
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func NewUniqueHexID(prefix string, randlen, maxlen int) (ID, error) {
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u, err := NewUniqueHex(prefix, randlen, maxlen)
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return ID(u), err
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}
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