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/**
* Verifies behavior around implicit sessions in the mongo shell.
*/
(function() {
"use strict";
/**
* Runs the given function, inspecting the outgoing command object and making assertions about
* its logical session id.
*/
function inspectCommandForSessionId(func, {shouldIncludeId, expectedId, differentFromId}) {
const mongoRunCommandOriginal = Mongo.prototype.runCommand;
const sentinel = {};
let cmdObjSeen = sentinel;
Mongo.prototype.runCommand = function runCommandSpy(dbName, cmdObj, options) {
cmdObjSeen = cmdObj;
return mongoRunCommandOriginal.apply(this, arguments);
};
try {
assert.doesNotThrow(func);
} finally {
Mongo.prototype.runCommand = mongoRunCommandOriginal;
}
if (cmdObjSeen === sentinel) {
throw new Error("Mongo.prototype.runCommand() was never called: " + func.toString());
}
// If the command is in a wrapped form, then we look for the actual command object inside
// the query/$query object.
let cmdName = Object.keys(cmdObjSeen)[0];
if (cmdName === "query" || cmdName === "$query") {
cmdObjSeen = cmdObjSeen[cmdName];
cmdName = Object.keys(cmdObjSeen)[0];
}
if (shouldIncludeId) {
assert(cmdObjSeen.hasOwnProperty("lsid"),
"Expected operation " + tojson(cmdObjSeen) + " to have a logical session id.");
if (expectedId) {
assert(bsonBinaryEqual(expectedId, cmdObjSeen.lsid),
"The sent session id did not match the expected, sent: " +
tojson(cmdObjSeen.lsid) + ", expected: " + tojson(expectedId));
}
if (differentFromId) {
assert(!bsonBinaryEqual(differentFromId, cmdObjSeen.lsid),
"The sent session id was not different from the expected, sent: " +
tojson(cmdObjSeen.lsid) + ", expected: " + tojson(differentFromId));
}
} else {
assert(!cmdObjSeen.hasOwnProperty("lsid"),
"Expected operation " + tojson(cmdObjSeen) + " to not have a logical session id.");
}
return cmdObjSeen.lsid;
}
// Tests regular behavior of implicit sessions.
function runTest() {
const conn = MongoRunner.runMongod();
// Commands run on a database without an explicit session should use an implicit one.
const testDB = conn.getDB("test");
const coll = testDB.getCollection("foo");
const implicitId = inspectCommandForSessionId(function() {
assert.writeOK(coll.insert({x: 1}));
}, {shouldIncludeId: true});
// Unacknowledged writes have no session id.
inspectCommandForSessionId(function() {
coll.insert({x: 1}, {writeConcern: {w: 0}});
}, {shouldIncludeId: false});
assert(bsonBinaryEqual(testDB.getSession().getSessionId(), implicitId),
"Expected the id of the database's implicit session to match the one sent, sent: " +
tojson(implicitId) +
" db session id: " + tojson(testDB.getSession().getSessionId()));
// Implicit sessions are not causally consistent.
assert(!testDB.getSession().getOptions().isCausalConsistency(),
"Expected the database's implicit session to not be causally consistent");
// Further commands run on the same database should reuse the implicit session.
inspectCommandForSessionId(function() {
assert.writeOK(coll.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
// New collections from the same database should inherit the implicit session.
const collTwo = testDB.getCollection("bar");
inspectCommandForSessionId(function() {
assert.writeOK(collTwo.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
// Sibling databases should inherit the implicit session.
let siblingColl = testDB.getSiblingDB("foo").getCollection("bar");
inspectCommandForSessionId(function() {
assert.writeOK(siblingColl.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
// A new database from the same connection should inherit the implicit session.
const newCollSameConn = conn.getDB("testTwo").getCollection("foo");
inspectCommandForSessionId(function() {
assert.writeOK(newCollSameConn.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
// A new database from a new connection should use a different implicit session.
const newCollNewConn = new Mongo(conn.host).getDB("test").getCollection("foo");
inspectCommandForSessionId(function() {
assert.writeOK(newCollNewConn.insert({x: 1}));
}, {shouldIncludeId: true, differentFromId: implicitId});
// The original implicit session should still live on the first database.
inspectCommandForSessionId(function() {
assert.writeOK(coll.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
// Databases created from an explicit session should override any implicit sessions.
const session = conn.startSession();
const sessionColl = session.getDatabase("test").getCollection("foo");
const explicitId = inspectCommandForSessionId(function() {
assert.writeOK(sessionColl.insert({x: 1}));
}, {shouldIncludeId: true, differentFromId: implicitId});
assert(bsonBinaryEqual(session.getSessionId(), explicitId),
"Expected the id of the explicit session to match the one sent, sent: " +
tojson(explicitId) + " explicit session id: " + tojson(session.getSessionId()));
assert(bsonBinaryEqual(sessionColl.getDB().getSession().getSessionId(), explicitId),
"Expected id of the database's session to match the explicit session's id, sent: " +
tojson(sessionColl.getDB().getSession().getSessionId()) +
", explicit session id: " + tojson(session.getSessionId()));
// The original implicit session should still live on the first database.
inspectCommandForSessionId(function() {
assert.writeOK(coll.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
// New databases on the same connection as the explicit session should still inherit the
// original implicit session.
const newCollSameConnAfter = conn.getDB("testThree").getCollection("foo");
inspectCommandForSessionId(function() {
assert.writeOK(newCollSameConnAfter.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
session.endSession();
MongoRunner.stopMongod(conn);
}
// Tests behavior when the test flag to disable implicit sessions is changed.
function runTestTransitionToDisabled() {
const conn = MongoRunner.runMongod();
// Existing implicit sessions should be erased when the disable flag is set.
const coll = conn.getDB("test").getCollection("foo");
const implicitId = inspectCommandForSessionId(function() {
assert.writeOK(coll.insert({x: 1}));
}, {shouldIncludeId: true});
TestData.disableImplicitSessions = true;
inspectCommandForSessionId(function() {
assert.writeOK(coll.insert({x: 1}));
}, {shouldIncludeId: false});
// After the flag is unset, databases using existing connections with implicit sessions will
// use the original implicit sessions again and new connections will create and use new
// implicit sessions.
TestData.disableImplicitSessions = false;
inspectCommandForSessionId(function() {
assert.writeOK(coll.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
const newColl = conn.getDB("test").getCollection("foo");
inspectCommandForSessionId(function() {
assert.writeOK(newColl.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: implicitId});
const newCollNewConn = new Mongo(conn.host).getDB("test").getCollection("foo");
inspectCommandForSessionId(function() {
assert.writeOK(newCollNewConn.insert({x: 1}));
}, {shouldIncludeId: true, differentFromId: implicitId});
// Explicit sessions should not be affected by the disable flag being set.
const session = conn.startSession();
const sessionColl = session.getDatabase("test").getCollection("foo");
const explicitId = inspectCommandForSessionId(function() {
assert.writeOK(sessionColl.insert({x: 1}));
}, {shouldIncludeId: true});
TestData.disableImplicitSessions = true;
inspectCommandForSessionId(function() {
assert.writeOK(sessionColl.insert({x: 1}));
}, {shouldIncludeId: true, expectedId: explicitId});
session.endSession();
MongoRunner.stopMongod(conn);
}
// Tests behavior of implicit sessions when they are disabled via a test flag.
function runTestDisabled() {
const conn = MongoRunner.runMongod();
// Commands run without an explicit session should not use an implicit one.
const coll = conn.getDB("test").getCollection("foo");
inspectCommandForSessionId(function() {
assert.writeOK(coll.insert({x: 1}));
}, {shouldIncludeId: false});
// Explicit sessions should still include session ids.
const session = conn.startSession();
const sessionColl = session.getDatabase("test").getCollection("foo");
inspectCommandForSessionId(function() {
assert.writeOK(sessionColl.insert({x: 1}));
}, {shouldIncludeId: true});
// Commands run in a parallel shell inherit the disable flag.
TestData.inspectCommandForSessionId = inspectCommandForSessionId;
const awaitShell = startParallelShell(function() {
const parallelColl = db.getCollection("foo");
TestData.inspectCommandForSessionId(function() {
assert.writeOK(parallelColl.insert({x: 1}));
}, {shouldIncludeId: false});
}, conn.port);
awaitShell();
session.endSession();
MongoRunner.stopMongod(conn);
}
runTest();
runTestTransitionToDisabled();
assert(_shouldUseImplicitSessions());
TestData.disableImplicitSessions = true;
runTestDisabled();
})();
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