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"use strict";
load("jstests/libs/fixture_helpers.js");
/**
* Utilities for feature flags.
*/
var FeatureFlagUtil = class {
/**
* If 'ignoreFCV' is true, return whether or not the given feature flag is enabled,
* regardless of the current FCV version (this is used when a feature flag needs to be enabled
* in downgraded FCV versions).
* If 'ignoreFCV' is false or null, we only return true if the flag is enabled and this FCV
* version is greater or equal to the required version for the flag.
*/
static isEnabled(db, featureFlag, user, ignoreFCV) {
// In order to get an accurate answer for whether a feature flag is enabled, we need to ask
// a mongod. If db represents a connection to mongos, or some other configuration, we need
// to obtain the correct connection to a mongod.
let conn;
const setConn = (db) => {
if (FixtureHelpers.isMongos(db)) {
const primaries = FixtureHelpers.getPrimaries(db);
assert.gt(primaries.length, 0, "Expected at least one primary");
conn = primaries[0];
} else {
conn = db;
}
};
try {
setConn(db);
} catch (err) {
// Some db-like objects (e.g. ShardingTest.shard0) aren't supported by FixtureHelpers,
// but we can replace it with an object that should work and try again.
setConn(db.getDB(db.defaultDB));
}
if (user) {
conn.auth(user.username, user.password);
}
const fcvDoc = assert.commandWorked(
conn.adminCommand({getParameter: 1, featureCompatibilityVersion: 1}));
const fullFlagName = `featureFlag${featureFlag}`;
const flagDoc = conn.adminCommand({getParameter: 1, [fullFlagName]: 1});
if (!flagDoc.ok) {
// Feature flag not found.
assert.eq(flagDoc.errmsg, "no option found to get");
return false;
}
const flagIsEnabled = flagDoc.hasOwnProperty(fullFlagName) && flagDoc[fullFlagName].value;
const flagVersionIsValid = !fcvDoc.hasOwnProperty("featureCompatibilityVersion") ||
MongoRunner.compareBinVersions(fcvDoc.featureCompatibilityVersion.version,
flagDoc[fullFlagName].version) >= 0;
return flagIsEnabled && (ignoreFCV || flagVersionIsValid);
}
};
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