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"use strict";
/**
* Helper functions that help get information or manipulate nodes in the fixture, whether it's a
* replica set, a sharded cluster, etc.
*/
var FixtureHelpers = (function() {
load("jstests/concurrency/fsm_workload_helpers/server_types.js"); // For isMongos.
function _getHostStringForReplSet(connectionToNodeInSet) {
const isMaster = assert.commandWorked(connectionToNodeInSet.getDB("test").isMaster());
assert(
isMaster.hasOwnProperty("setName"),
"Attempted to get replica set connection to a node that is not part of a replica set");
return isMaster.setName + "/" + isMaster.hosts.join(",");
}
/**
* Returns an array of connections to each data-bearing replica set in the fixture (not
* including the config servers).
*/
function _getAllReplicas(db) {
let replicas = [];
if (isMongos(db)) {
const shardObjs = db.getSiblingDB("config").shards.find().sort({_id: 1});
replicas = shardObjs.map((shardObj) => new ReplSetTest(shardObj.host));
} else {
replicas = [new ReplSetTest(_getHostStringForReplSet(db.getMongo()))];
}
return replicas;
}
/**
* Uses ReplSetTest.awaitReplication() on each replica set in the fixture to wait for each node
* in each replica set in the fixture (besides the config servers) to reach the same op time.
* Asserts if the fixture is a standalone or if the shards are standalones.
*/
function awaitReplication(db) {
_getAllReplicas(db).forEach((replSet) => replSet.awaitReplication());
}
/**
* Uses ReplSetTest.awaitLastOpCommitted() on each replica set in the fixture (besides the
* config servers) to wait for the last oplog entry on the respective primary to be visible in
* the committed snapshot view of the oplog on all secondaries.
*
* Asserts if the fixture is a standalone or if the shards are standalones.
*/
function awaitLastOpCommitted(db) {
_getAllReplicas(db).forEach((replSet) => replSet.awaitLastOpCommitted());
}
/**
* Looks for an entry in the config database for the given collection, to check whether it's
* sharded.
*/
function isSharded(coll) {
const db = coll.getDB();
return db.getSiblingDB("config").collections.find({_id: coll.getFullName()}).count() > 0;
}
/**
* Returns the resolved view definition for 'collName' if it is a view, 'undefined' otherwise.
*/
function getViewDefinition(db, collName) {
return db.getCollectionInfos({type: "view", name: collName}).shift();
}
/**
* Returns the number of shards that 'coll' has any chunks on. Returns 1 if the collection is
* not sharded. Note that if the balancer is enabled then the number of shards with chunks for
* this collection can change at any moment.
*/
function numberOfShardsForCollection(coll) {
if (!isMongos(coll.getDB()) || !isSharded(coll)) {
// If we're not talking to a mongos, or the collection is not sharded, there is one
// shard.
return 1;
}
const collMetadata =
db.getSiblingDB("config").collections.findOne({_id: coll.getFullName()});
if (collMetadata.timestamp) {
return db.getSiblingDB("config")
.chunks.distinct("shard", {uuid: collMetadata.uuid})
.length;
} else {
return db.getSiblingDB("config")
.chunks.distinct("shard", {ns: coll.getFullName()})
.length;
}
}
/**
* Runs the function given by 'func' passing the database given by 'db' from each shard nodes in
* the fixture (besides the config servers). Returns the array of return values from executed
* functions. If the fixture is a standalone, will run the function on the database directly.
*/
function mapOnEachShardNode({db, func, primaryNodeOnly}) {
function getRequestedConns(host) {
const conn = new Mongo(host);
const isMaster = conn.getDB("test").isMaster();
if (isMaster.hasOwnProperty("setName")) {
// It's a repl set.
const rs = new ReplSetTest(host);
return primaryNodeOnly ? [rs.getPrimary()] : rs.nodes;
} else {
// It's a standalone.
return [conn];
}
}
let connList = [];
if (isMongos(db)) {
const shardObjs = db.getSiblingDB("config").shards.find().sort({_id: 1}).toArray();
for (let shardObj of shardObjs) {
connList = connList.concat(getRequestedConns(shardObj.host));
}
} else {
connList = connList.concat(getRequestedConns(db.getMongo().host));
}
return connList.map((conn) => func(conn.getDB(db.getName())));
}
/**
* Runs the command given by 'cmdObj' on the database given by 'db' on each shard nodes in
* the fixture (besides the config servers). Asserts that each command works, and returns an
* array with the responses from each shard, or with a single element if the fixture was a
* replica set. If the fixture is a standalone, will run the command directly.
*/
function runCommandOnAllShards({db, cmdObj, primaryNodeOnly}) {
return mapOnEachShardNode({
db,
func: (primaryDb) => assert.commandWorked(primaryDb.runCommand(cmdObj)),
primaryNodeOnly
});
}
/**
* A helper function for 'runCommandOnAllShards' to only run command on the primary nodes.
*/
function runCommandOnEachPrimary({db, cmdObj}) {
return runCommandOnAllShards({db, cmdObj, primaryNodeOnly: true});
}
/**
* Returns a connection to the replica set primary for the primary shard for the given database.
* Returns the same connection that 'db' is using if the fixture is not a sharded cluster.
*/
function getPrimaryForNodeHostingDatabase(db) {
if (!isMongos(db)) {
return db.getMongo();
}
const configDB = db.getSiblingDB("config");
let shardConn = null;
configDB.databases.find().forEach(function(dbObj) {
if (dbObj._id === db.getName()) {
const shardObj = configDB.shards.findOne({_id: dbObj.primary});
shardConn = new Mongo(shardObj.host);
}
});
assert.neq(null, shardConn, "could not find shard hosting database " + db.getName());
return shardConn;
}
/**
* Returns true if we have a replica set.
*/
function isReplSet(db) {
const primaryInfo = db.isMaster();
return primaryInfo.hasOwnProperty('setName');
}
return {
isMongos: isMongos,
isSharded: isSharded,
getViewDefinition: getViewDefinition,
numberOfShardsForCollection: numberOfShardsForCollection,
awaitReplication: awaitReplication,
awaitLastOpCommitted: awaitLastOpCommitted,
mapOnEachShardNode: mapOnEachShardNode,
runCommandOnAllShards: runCommandOnAllShards,
runCommandOnEachPrimary: runCommandOnEachPrimary,
getPrimaryForNodeHostingDatabase: getPrimaryForNodeHostingDatabase,
isReplSet: isReplSet,
};
})();
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