luciano/kinesis-consumer
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Run initial scan immediately (#123)

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Rather than starting the shard scan loop and waiting for next scan tick before
fetching any data, do the first poll immediately, and then wait.
This commit is contained in:
Jason Tackaberry 2020-08-01 18:45:37 -04:00 committed by GitHub
parent 97ffabeaa5
commit 3f2519e51c
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 23 additions and 22 deletions
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17
consumer.go
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@ -158,10 +158,6 @@ func (c *Consumer) ScanShard(ctx context.Context, shardID string, fn ScanFunc) e
defer scanTicker.Stop() defer scanTicker.Stop()
for { for {
select {
case <-ctx.Done():
return nil
case <-scanTicker.C:
resp, err := c.client.GetRecords(&kinesis.GetRecordsInput{ resp, err := c.client.GetRecords(&kinesis.GetRecordsInput{
Limit: aws.Int64(c.maxRecords), Limit: aws.Int64(c.maxRecords),
ShardIterator: shardIterator, ShardIterator: shardIterator,
@ -181,10 +177,7 @@ func (c *Consumer) ScanShard(ctx context.Context, shardID string, fn ScanFunc) e
if err != nil { if err != nil {
return fmt.Errorf("get shard iterator error: %v", err) return fmt.Errorf("get shard iterator error: %v", err)
} }
} else {
continue
}
// loop over records, call callback func // loop over records, call callback func
for _, r := range resp.Records { for _, r := range resp.Records {
select { select {
@ -214,6 +207,14 @@ func (c *Consumer) ScanShard(ctx context.Context, shardID string, fn ScanFunc) e
shardIterator = resp.NextShardIterator shardIterator = resp.NextShardIterator
} }
// Wait for next scan
select {
case <-ctx.Done():
return nil
case <-scanTicker.C:
continue
}
} }
} }