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// Utilities for testing UUIDs.
/**
* Reads the collection entry for 'nss' from config.collections, asserts that such an entry exists,
* and returns its 'uuid' field, which may be undefined.
*/
function getUUIDFromConfigCollections(mongosConn, nss) {
let collEntry = mongosConn.getDB("config").collections.findOne({_id: nss});
assert.neq(undefined, collEntry);
return collEntry.uuid;
}
/**
* Calls listCollections on a connection to 'db' with a filter for 'collName', asserts that a result
* for 'collName' was returned, and returns its 'uuid' field, which may be undefined.
*/
function getUUIDFromListCollections(db, collName) {
let listCollsRes = db.runCommand({listCollections: 1, filter: {name: collName}});
assert.commandWorked(listCollsRes);
assert.neq(undefined, listCollsRes.cursor);
assert.neq(undefined, listCollsRes.cursor.firstBatch);
assert.eq(1, listCollsRes.cursor.firstBatch.length);
assert.neq(undefined, listCollsRes.cursor.firstBatch[0].info);
return listCollsRes.cursor.firstBatch[0].info.uuid;
}
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