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Fetch all shards by paginating results #15

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Fetch all shards by paginating results #15

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33 changes: 21 additions & 12 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -53,23 +53,32 @@ class DynamoDBStream extends EventEmitter {
StreamArn: this._streamArn
}

const { StreamDescription } = await this._ddbStreams.describeStream(params)

const shards = StreamDescription.Shards
const newShardIds = []
let lastShardId = null

do {
if (lastShardId) {
debug('lastShardId: %s', lastShardId)
params.ExclusiveStartShardId = lastShardId
}
const { StreamDescription } = await this._ddbStreams.describeStream(params)

// collect all the new shards of this stream
for (const newShardEntry of shards) {
const existingShardEntry = this._shards.get(newShardEntry.ShardId)
const shards = StreamDescription.Shards
lastShardId = StreamDescription.LastEvaluatedShardId

if (!existingShardEntry) {
this._shards.set(newShardEntry.ShardId, {
shardId: newShardEntry.ShardId
})
// collect all the new shards of this stream
for (const newShardEntry of shards) {
const existingShardEntry = this._shards.get(newShardEntry.ShardId)

newShardIds.push(newShardEntry.ShardId)
if (!existingShardEntry) {
this._shards.set(newShardEntry.ShardId, {
shardId: newShardEntry.ShardId
})

newShardIds.push(newShardEntry.ShardId)
}
}
}
} while (lastShardId)

if (newShardIds.length > 0) {
debug('Added %d new shards', newShardIds.length)
Expand Down