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fix(NODE-5155) release connection lock when topology closed #3618

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fix(NODE-5155) release connection lock when topology closed #3618

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3 changes: 3 additions & 0 deletions src/mongo_client.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -450,6 +450,9 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> {
topology.client = this;

topology.once(Topology.OPEN, () => this.emit('open', this));
topology.on(Topology.TOPOLOGY_CLOSED, () => {
this.connectionLock = undefined;
});

for (const event of MONGO_CLIENT_EVENTS) {
topology.on(event, (...args: any[]) => this.emit(event, ...(args as any)));
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10 changes: 10 additions & 0 deletions test/integration/node-specific/mongo_client.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -574,6 +574,16 @@ describe('class MongoClient', function () {
expect(topologyOpenEvents).to.have.lengthOf(1);
expect(client.topology?.isConnected()).to.be.true;
});

it('releases the lock if the topology is closed before connection is complete', function (done) {
clientConnect();
client.close();
client.once('topologyClosed', async () => {
await clientConnect();
expect(client.topology?.isConnected()).to.be.true;
done();
});
});
});

context('#close()', () => {
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