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fix(framework-provider-aws): ensure storeSnapshot is idempotent #1419

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merged 3 commits into from
Jun 26, 2023
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fix(framework-provider-aws): ensure storeSnapshot is idempotent #1419

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6baaf74
fix(framework-provider-aws): ensure storeSnapshot is idempotent
DKarandikar Jun 26, 2023
644fbed
refactor(framework-provider-aws): remove unnecessary try/catch
DKarandikar Jun 26, 2023
9bc5c7d
chore: add change file
DKarandikar Jun 26, 2023
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71 changes: 29 additions & 42 deletions packages/framework-provider-aws/src/library/events-adapter.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -114,50 +114,37 @@ export async function storeSnapshot(
snapshotEnvelope: NonPersistedEntitySnapshotEnvelope,
config: BoosterConfig
): Promise<EntitySnapshotEnvelope> {
try {
const logger = getLogger(config, 'EventsAdapter#storeSnapshot')
logger.debug('Storing the following snapshot:', snapshotEnvelope)
const logger = getLogger(config, 'EventsAdapter#storeSnapshot')
logger.debug('Storing the following snapshot:', snapshotEnvelope)

const partitionKey = partitionKeyForEntitySnapshot(snapshotEnvelope.entityTypeName, snapshotEnvelope.entityID)
/**
* The sort key of the snapshot matches the sort key of the last event that generated it.
* Entity snapshots can be potentially created by competing processes, and this way
* of storing the data makes snapshot creation an idempotent operation, allowing us to
* aggressively cache snapshots. If the snapshot already exists, it will be silently overwritten.
*/
const sortKey = snapshotEnvelope.snapshottedEventCreatedAt
const persistableSnapshot = {
...snapshotEnvelope,
createdAt: snapshotEnvelope.snapshottedEventCreatedAt,
persistedAt: new Date().toISOString(),
}
await dynamoDB
.put({
TableName: config.resourceNames.eventsStore,
ConditionExpression: `${eventsStoreAttributes.partitionKey} <> :partitionKey AND ${eventsStoreAttributes.sortKey} <> :sortKey`,
ExpressionAttributeValues: {
':partitionKey': partitionKey,
':sortKey': sortKey,
},
Item: {
...persistableSnapshot,
[eventsStoreAttributes.partitionKey]: partitionKey,
[eventsStoreAttributes.sortKey]: sortKey,
[eventsStoreAttributes.indexByEntity.partitionKey]: partitionKeyForIndexByEntity(
snapshotEnvelope.entityTypeName,
snapshotEnvelope.kind
),
},
})
.promise()
return persistableSnapshot
} catch (e) {
const error = e as Error
if (error.name == 'ConditionalCheckFailedException') {
throw new OptimisticConcurrencyUnexpectedVersionError(error.message)
}
throw e
const partitionKey = partitionKeyForEntitySnapshot(snapshotEnvelope.entityTypeName, snapshotEnvelope.entityID)
/**
* The sort key of the snapshot matches the sort key of the last event that generated it.
* Entity snapshots can be potentially created by competing processes, and this way
* of storing the data makes snapshot creation an idempotent operation, allowing us to
* aggressively cache snapshots. If the snapshot already exists, it will be silently overwritten.
*/
const sortKey = snapshotEnvelope.snapshottedEventCreatedAt
const persistableSnapshot = {
...snapshotEnvelope,
createdAt: snapshotEnvelope.snapshottedEventCreatedAt,
persistedAt: new Date().toISOString(),
}
await dynamoDB
.put({
TableName: config.resourceNames.eventsStore,
Item: {
...persistableSnapshot,
[eventsStoreAttributes.partitionKey]: partitionKey,
[eventsStoreAttributes.sortKey]: sortKey,
[eventsStoreAttributes.indexByEntity.partitionKey]: partitionKeyForIndexByEntity(
snapshotEnvelope.entityTypeName,
snapshotEnvelope.kind
),
},
})
.promise()
return persistableSnapshot
}

async function persistEvent(
Expand Down