Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

feat(NODE-2843): implement sessions advanceClusterTime method #2920

Merged
merged 5 commits into from
Aug 2, 2021
Merged
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 7 additions & 7 deletions src/sdam/common.ts
Original file line number Diff line number Diff line change
Expand Up @@ -66,16 +66,16 @@ export interface ClusterTime {
};
}

/** Shared function to determine clusterTime for a given topology */
export function resolveClusterTime(
topology: Topology | ClientSession,
/** Shared function to determine clusterTime for a given topology or session */
export function _advanceClusterTime(
nbbeeken marked this conversation as resolved.
Show resolved Hide resolved
entity: Topology | ClientSession,
$clusterTime: ClusterTime
): void {
if (topology.clusterTime == null) {
topology.clusterTime = $clusterTime;
if (entity.clusterTime == null) {
entity.clusterTime = $clusterTime;
} else {
if ($clusterTime.clusterTime.greaterThan(topology.clusterTime.clusterTime)) {
topology.clusterTime = $clusterTime;
if ($clusterTime.clusterTime.greaterThan(entity.clusterTime.clusterTime)) {
entity.clusterTime = $clusterTime;
}
}
}
4 changes: 2 additions & 2 deletions src/sdam/topology.ts
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@ import {
ServerType,
ClusterTime,
TimerQueue,
resolveClusterTime,
_advanceClusterTime,
drainTimerQueue,
clearAndRemoveTimerFrom,
STATE_CLOSED,
Expand Down Expand Up @@ -681,7 +681,7 @@ export class Topology extends TypedEventEmitter<TopologyEvents> {
// value of the clusterTime embedded field."
const clusterTime = serverDescription.$clusterTime;
if (clusterTime) {
resolveClusterTime(this, clusterTime);
_advanceClusterTime(this, clusterTime);
}

// If we already know all the information contained in this updated description, then
Expand Down
32 changes: 30 additions & 2 deletions src/sessions.ts
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ import { PromiseProvider } from './promise_provider';
import { Binary, Long, Timestamp, Document } from './bson';
import { ReadPreference } from './read_preference';
import { isTransactionCommand, TxnState, Transaction, TransactionOptions } from './transactions';
import { resolveClusterTime, ClusterTime } from './sdam/common';
import { _advanceClusterTime, ClusterTime } from './sdam/common';
import { isSharded } from './cmap/wire_protocol/shared';
import {
MongoError,
Expand Down Expand Up @@ -249,6 +249,34 @@ export class ClientSession extends TypedEventEmitter<ClientSessionEvents> {
}
}

/**
* Advances the clusterTime for a ClientSession to the provided clusterTime of another ClientSession
*
* @param clusterTime - the $clusterTime returned by the server from another session in the form of a document containing the `BSON.Timestamp` clusterTime and signature
*/
advanceClusterTime(clusterTime: ClusterTime): void {
if (!clusterTime || typeof clusterTime !== 'object') {
throw new MongoInvalidArgumentError('input cluster time must be an object');
}
if (!clusterTime.clusterTime || clusterTime.clusterTime._bsontype !== 'Timestamp') {
throw new MongoInvalidArgumentError(
'input cluster time "clusterTime" property must be a valid BSON Timestamp'
);
}
if (
!clusterTime.signature ||
clusterTime.signature.hash?._bsontype !== 'Binary' ||
(typeof clusterTime.signature.keyId !== 'number' &&
clusterTime.signature.keyId?._bsontype !== 'Long') // apparently we decode the key to number?
Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

@nbbeeken Just bringing your attention to this change

Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Just so I do not block this PR: looks correct to me.

Remind me to tell you the deeper issue here / file a ticket next week, has to do with BSON promote* options I think.

) {
throw new MongoInvalidArgumentError(
'input cluster time must have a valid "signature" property with BSON Binary hash and BSON Long keyId'
);
}

_advanceClusterTime(this, clusterTime);
}

/**
* Used to determine if this session equals another
*
Expand Down Expand Up @@ -886,7 +914,7 @@ export function applySession(

export function updateSessionFromResponse(session: ClientSession, document: Document): void {
if (document.$clusterTime) {
resolveClusterTime(session, document.$clusterTime);
_advanceClusterTime(session, document.$clusterTime);
}

if (document.operationTime && session && session.supports.causalConsistency) {
Expand Down
Loading