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/**
* Helpers for doing a snapshot read in concurrency suites. Specifically, the read is a find that
* spans a getmore.
*/
/**
* Parses a cursor from cmdResult, if possible.
*/
function parseCursor(cmdResult) {
if (cmdResult.hasOwnProperty("cursor")) {
assert(cmdResult.cursor.hasOwnProperty("id"));
return cmdResult.cursor;
}
return null;
}
/**
* Asserts cmd has either failed with a code in a specified set of codes or has succeeded.
*/
function assertWorkedOrFailed(cmd, cmdResult, errorCodeSet) {
if (!cmdResult.ok) {
assert.commandFailedWithCode(cmdResult,
errorCodeSet,
"expected command to fail with one of " + errorCodeSet +
", cmd: " + tojson(cmd) + ", result: " +
tojson(cmdResult));
} else {
assert.commandWorked(cmdResult);
}
}
/**
* Performs a snapshot find.
*/
function doSnapshotFind(sortByAscending, collName, data, findErrorCodes) {
// Reset txnNumber and stmtId for this transaction.
data.txnNumber++;
data.stmtId = 0;
const sortOrder = sortByAscending ? {_id: 1} : {_id: -1};
const findCmd = {
find: collName,
sort: sortOrder,
batchSize: 0,
readConcern: {level: "snapshot"},
txnNumber: NumberLong(data.txnNumber),
stmtId: NumberInt(data.stmtId++),
startTransaction: true,
autocommit: false
};
// Establish a snapshot batchSize:0 cursor.
let res = data.sessionDb.runCommand(findCmd);
assertWorkedOrFailed(findCmd, res, findErrorCodes);
const cursor = parseCursor(res);
if (!cursor) {
const abortCmd = {
abortTransaction: 1,
txnNumber: NumberLong(data.txnNumber),
autocommit: false
};
res = data.sessionDb.adminCommand(abortCmd);
const abortErrorCodes = [
ErrorCodes.NoSuchTransaction,
ErrorCodes.TransactionCommitted,
ErrorCodes.TransactionTooOld,
ErrorCodes.Interrupted
];
assertWorkedOrFailed(abortCmd, res, abortErrorCodes);
data.cursorId = 0;
} else {
assert(cursor.hasOwnProperty("firstBatch"), tojson(res));
assert.eq(0, cursor.firstBatch.length, tojson(res));
assert.neq(cursor.id, 0);
// Store the cursor Id in the data object.
data.cursorId = cursor.id;
}
}
/**
* Performs a snapshot getmore. This function is to be used in conjunction with doSnapshotFind.
*/
function doSnapshotGetMore(collName, data, getMoreErrorCodes, commitTransactionErrorCodes) {
// doSnapshotGetMore may be called even if doSnapshotFind fails to obtain a cursor.
if (!data.cursorId) {
return;
}
const getMoreCmd = {
getMore: data.cursorId,
collection: collName,
batchSize: data.batchSize,
txnNumber: NumberLong(data.txnNumber),
stmtId: NumberInt(data.stmtId++),
autocommit: false
};
let res = data.sessionDb.runCommand(getMoreCmd);
assertWorkedOrFailed(getMoreCmd, res, getMoreErrorCodes);
const commitCmd = {
commitTransaction: 1,
txnNumber: NumberLong(data.txnNumber),
stmtId: NumberInt(data.stmtId++),
autocommit: false
};
res = data.sessionDb.adminCommand(commitCmd);
assertWorkedOrFailed(commitCmd, res, commitTransactionErrorCodes);
}
/**
* This function can be used to share session data across threads.
*/
function insertSessionDoc(db, collName, data, session) {
const sessionDoc = {"_id": "sessionDoc" + data.tid, "id": session.getSessionId().id};
const res = db[collName].insert(sessionDoc);
assert.writeOK(res);
assert.eq(1, res.nInserted);
}
/**
* This function can be used in conjunction with insertSessionDoc to kill any active sessions on
* teardown.
*/
function killSessionsFromDocs(db, collName) {
const sessionDocCursor = db[collName].find({"_id": {$regex: "sessionDoc*"}});
assert(sessionDocCursor.hasNext());
while (sessionDocCursor.hasNext()) {
const sessionDoc = sessionDocCursor.next();
assert.commandWorked(db.runCommand({killSessions: [{id: sessionDoc.id}]}));
}
}
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