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/**
* Use prototype overrides to set read concern and write concern while running tests.
*
* A test can override the default read and write concern of commands by loading this library before
* the test is run and setting the 'TestData.defaultReadConcernLevel' or
* 'TestData.defaultWriteConcern' variables with the desired read/write concern level. For example,
* setting:
*
* TestData.defaultReadConcernLevel = "majority"
* TestData.writeConcernLevel = {w: "majority"}
*
* will run all commands with read/write concern "majority". It is also possible to only override
* the write concern of commands, by setting 'TestData.defaultReadConcernLevel' = null. This will
* not affect the default read concern of commands in any way.
*
*/
(function() {
"use strict";
load("jstests/libs/override_methods/override_helpers.js");
load("jstests/libs/override_methods/read_and_write_concern_helpers.js");
if (typeof TestData === "undefined" || !TestData.hasOwnProperty("defaultReadConcernLevel")) {
throw new Error(
"The readConcern level to use must be set as the 'defaultReadConcernLevel'" +
" property on the global TestData object");
}
// If the default read concern level is null, that indicates that no read concern overrides
// should be applied.
const kDefaultReadConcern = {level: TestData.defaultReadConcernLevel};
const kDefaultWriteConcern =
(TestData.hasOwnProperty("defaultWriteConcern")) ? TestData.defaultWriteConcern : {
w: "majority",
// Use a "signature" value that won't typically match a value assigned in normal use.
// This way the wtimeout set by this override is distinguishable in the server logs.
wtimeout: 5 * 60 * 1000 + 321, // 300321ms
};
function runCommandWithReadAndWriteConcerns(
conn, dbName, commandName, commandObj, func, makeFuncArgs) {
if (typeof commandObj !== "object" || commandObj === null) {
return func.apply(conn, makeFuncArgs(commandObj));
}
// If the command is in a wrapped form, then we look for the actual command object inside
// the query/$query object.
let commandObjUnwrapped = commandObj;
if (commandName === "query" || commandName === "$query") {
commandObjUnwrapped = commandObj[commandName];
commandName = Object.keys(commandObjUnwrapped)[0];
}
let shouldForceReadConcern = kCommandsSupportingReadConcern.has(commandName);
let shouldForceWriteConcern = kCommandsSupportingWriteConcern.has(commandName);
// All commands in a multi-document transaction have the autocommit property.
if (commandObj.hasOwnProperty("autocommit")) {
shouldForceReadConcern = false;
if (!kCommandsSupportingWriteConcernInTransaction.has(commandName)) {
shouldForceWriteConcern = false;
}
}
if (commandName === "aggregate") {
if (OverrideHelpers.isAggregationWithListLocalSessionsStage(commandName,
commandObjUnwrapped)) {
// The $listLocalSessions stage can only be used with readConcern={level: "local"}.
shouldForceReadConcern = false;
}
if (OverrideHelpers.isAggregationWithOutOrMergeStage(commandName,
commandObjUnwrapped)) {
// The $out stage can only be used with readConcern={level: "local"} or
// readConcern={level: "majority"}
if (TestData.defaultReadConcernLevel === "linearizable") {
shouldForceReadConcern = false;
}
} else {
// A writeConcern can only be used with a $out stage.
shouldForceWriteConcern = false;
}
if (commandObjUnwrapped.explain) {
// Attempting to specify a readConcern while explaining an aggregation would always
// return an error prior to SERVER-30582 and it otherwise only compatible with
// readConcern={level: "local"}.
shouldForceReadConcern = false;
}
} else if (OverrideHelpers.isMapReduceWithInlineOutput(commandName, commandObjUnwrapped)) {
// A writeConcern can only be used with non-inline output.
shouldForceWriteConcern = false;
}
if (kCommandsOnlySupportingReadConcernSnapshot.has(commandName) &&
kDefaultReadConcern.level === "snapshot") {
shouldForceReadConcern = true;
}
const inWrappedForm = commandObj !== commandObjUnwrapped;
// Only override read concern if an override level was specified.
if (shouldForceReadConcern && (kDefaultReadConcern.level !== null)) {
// We create a copy of 'commandObj' to avoid mutating the parameter the caller
// specified.
commandObj = Object.assign({}, commandObj);
if (inWrappedForm) {
commandObjUnwrapped = Object.assign({}, commandObjUnwrapped);
commandObj[Object.keys(commandObj)[0]] = commandObjUnwrapped;
} else {
commandObjUnwrapped = commandObj;
}
let readConcern;
if (commandObjUnwrapped.hasOwnProperty("readConcern")) {
readConcern = commandObjUnwrapped.readConcern;
if (typeof readConcern !== "object" || readConcern === null ||
(readConcern.hasOwnProperty("level") &&
bsonWoCompare({_: readConcern.level}, {_: kDefaultReadConcern.level}) !== 0)) {
throw new Error("Cowardly refusing to override read concern of command: " +
tojson(commandObj));
}
}
// We create a copy of the readConcern object to avoid mutating the parameter the
// caller specified.
readConcern = Object.assign({}, readConcern, kDefaultReadConcern);
commandObjUnwrapped.readConcern = readConcern;
}
if (shouldForceWriteConcern) {
// We create a copy of 'commandObj' to avoid mutating the parameter the caller
// specified.
commandObj = Object.assign({}, commandObj);
if (inWrappedForm) {
commandObjUnwrapped = Object.assign({}, commandObjUnwrapped);
commandObj[Object.keys(commandObj)[0]] = commandObjUnwrapped;
} else {
commandObjUnwrapped = commandObj;
}
let writeConcern;
if (commandObjUnwrapped.hasOwnProperty("writeConcern")) {
writeConcern = commandObjUnwrapped.writeConcern;
if (typeof writeConcern !== "object" || writeConcern === null ||
(writeConcern.hasOwnProperty("w") &&
bsonWoCompare({_: writeConcern.w}, {_: kDefaultWriteConcern.w}) !== 0)) {
throw new Error("Cowardly refusing to override write concern of command: " +
tojson(commandObj));
}
}
// We create a copy of the writeConcern object to avoid mutating the parameter the
// caller specified.
writeConcern = Object.assign({}, writeConcern, kDefaultWriteConcern);
commandObjUnwrapped.writeConcern = writeConcern;
}
return func.apply(conn, makeFuncArgs(commandObj));
}
OverrideHelpers.prependOverrideInParallelShell(
"jstests/libs/override_methods/set_read_and_write_concerns.js");
OverrideHelpers.overrideRunCommand(runCommandWithReadAndWriteConcerns);
})();
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