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databroker.go
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databroker.go
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// Package databroker contains databroker protobuf definitions.
package databroker
import (
"context"
"fmt"
"io"
)
//go:generate go run github.com/golang/mock/mockgen -source=databroker.pb.go -destination ./mock_databroker/databroker.pb.go DataBrokerServiceClient
//go:generate go run github.com/golang/mock/mockgen -source=leaser.go -destination ./mock_databroker/leaser.go LeaserHandler
// ApplyOffsetAndLimit applies the offset and limit to the list of records.
func ApplyOffsetAndLimit(all []*Record, offset, limit int) (records []*Record, totalCount int) {
records = all
if offset < len(records) {
records = records[offset:]
} else {
records = nil
}
if limit <= len(records) {
records = records[:limit]
}
return records, len(all)
}
// InitialSync performs a sync latest and then returns all the results.
func InitialSync(
ctx context.Context,
client DataBrokerServiceClient,
req *SyncLatestRequest,
) (records []*Record, recordVersion, serverVersion uint64, err error) {
stream, err := client.SyncLatest(ctx, req)
if err != nil {
return nil, 0, 0, err
}
loop:
for {
res, err := stream.Recv()
switch {
case err == io.EOF:
break loop
case err != nil:
return nil, 0, 0, err
}
switch res := res.GetResponse().(type) {
case *SyncLatestResponse_Versions:
recordVersion = res.Versions.GetLatestRecordVersion()
serverVersion = res.Versions.GetServerVersion()
case *SyncLatestResponse_Record:
records = append(records, res.Record)
default:
panic(fmt.Sprintf("unexpected response: %T", res))
}
}
return records, recordVersion, serverVersion, nil
}