@aws-cdk/core
Version:
AWS Cloud Development Kit Core Library
77 lines • 8.43 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
/**
* Class that keeps track of the logical IDs that are assigned to resources
*
* Supports renaming the generated IDs.
*/
class LogicalIDs {
constructor() {
/**
* The rename table (old to new)
*/
this.renames = {};
/**
* All assigned names (new to old, may be identical)
*
* This is used to ensure that:
*
* - No 2 resources end up with the same final logical ID, unless they were the same to begin with.
* - All renames have been used at the end of renaming.
*/
this.reverse = {};
}
/**
* Rename a logical ID from an old ID to a new ID
*/
addRename(oldId, newId) {
if (oldId in this.renames) {
throw new Error(`A rename has already been registered for '${oldId}'`);
}
this.renames[oldId] = newId;
}
/**
* Return the renamed version of an ID or the original ID.
*/
applyRename(oldId) {
let newId = oldId;
if (oldId in this.renames) {
newId = this.renames[oldId];
}
// If this newId has already been used, it must have been with the same oldId
if (newId in this.reverse && this.reverse[newId] !== oldId) {
// tslint:disable-next-line:max-line-length
throw new Error(`Two objects have been assigned the same Logical ID: '${this.reverse[newId]}' and '${oldId}' are now both named '${newId}'.`);
}
this.reverse[newId] = oldId;
validateLogicalId(newId);
return newId;
}
/**
* Throw an error if not all renames have been used
*
* This is to assure that users didn't make typoes when registering renames.
*/
assertAllRenamesApplied() {
const keys = new Set();
Object.keys(this.renames).forEach(keys.add.bind(keys));
Object.keys(this.reverse).map(newId => {
keys.delete(this.reverse[newId]);
});
if (keys.size !== 0) {
const unusedRenames = Array.from(keys.values());
throw new Error(`The following Logical IDs were attempted to be renamed, but not found: ${unusedRenames.join(', ')}`);
}
}
}
exports.LogicalIDs = LogicalIDs;
const VALID_LOGICALID_REGEX = /^[A-Za-z][A-Za-z0-9]{1,254}$/;
/**
* Validate logical ID is valid for CloudFormation
*/
function validateLogicalId(logicalId) {
if (!VALID_LOGICALID_REGEX.test(logicalId)) {
throw new Error(`Logical ID must adhere to the regular expression: ${VALID_LOGICALID_REGEX.toString()}, got '${logicalId}'`);
}
}
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