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fix(lambda-event-sources): event source property maxConcurrency is not token-aware #27797

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Nov 20, 2023
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Original file line number Diff line number Diff line change
Expand Up @@ -345,7 +345,7 @@ export class EventSourceMapping extends cdk.Resource implements IEventSourceMapp
throw new Error(`maxBatchingWindow cannot be over 300 seconds, got ${props.maxBatchingWindow.toSeconds()}`);
}

if (props.maxConcurrency && (props.maxConcurrency < 2 || props.maxConcurrency > 1000)) {
if (props.maxConcurrency && !cdk.Token.isUnresolved(props.maxConcurrency) && (props.maxConcurrency < 2 || props.maxConcurrency > 1000)) {
throw new Error('maxConcurrency must be between 2 and 1000 concurrent instances');
}

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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,14 @@ describe('event source mapping', () => {
})).toThrow(/maxConcurrency must be between 2 and 1000 concurrent instances/);
});

test('does not throw if maxConcurrency is a token', () => {
expect(() => new EventSourceMapping(stack, 'test', {
target: fn,
eventSourceArn: '',
maxConcurrency: cdk.Token.asNumber({ Ref: 'abc' }),
})).not.toThrow();
});

test('maxConcurrency appears in stack', () => {
new EventSourceMapping(stack, 'test', {
target: fn,
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