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kafka.go
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kafka.go
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package connkafka
import (
"context"
"errors"
"fmt"
"reflect"
"strings"
"sync"
"github.com/twmb/franz-go/pkg/kgo"
"github.com/yuin/gopher-lua"
"go.temporal.io/sdk/log"
metadataStore "github.com/PeerDB-io/peer-flow/connectors/external_metadata"
"github.com/PeerDB-io/peer-flow/generated/protos"
"github.com/PeerDB-io/peer-flow/logger"
"github.com/PeerDB-io/peer-flow/model"
"github.com/PeerDB-io/peer-flow/model/qvalue"
"github.com/PeerDB-io/peer-flow/pua"
)
type KafkaConnector struct {
client *kgo.Client
pgMetadata *metadataStore.PostgresMetadataStore
logger log.Logger
}
func NewKafkaConnector(
ctx context.Context,
config *protos.KafkaConfig,
) (*KafkaConnector, error) {
client, err := kgo.NewClient(
kgo.SeedBrokers(config.Servers),
)
if err != nil {
return nil, fmt.Errorf("failed to create kafka client: %w", err)
}
return &KafkaConnector{
client: client,
logger: logger.LoggerFromCtx(ctx),
}, nil
}
func (c *KafkaConnector) Close() error {
if c != nil {
c.client.Close()
}
return nil
}
func (c *KafkaConnector) ConnectionActive(ctx context.Context) error {
return c.client.Ping(ctx)
}
func (c *KafkaConnector) CreateRawTable(ctx context.Context, req *protos.CreateRawTableInput) (*protos.CreateRawTableOutput, error) {
return &protos.CreateRawTableOutput{TableIdentifier: "n/a"}, nil
}
func (c *KafkaConnector) GetLastSyncBatchID(ctx context.Context, jobName string) (int64, error) {
return c.pgMetadata.GetLastBatchID(ctx, jobName)
}
func (c *KafkaConnector) GetLastOffset(ctx context.Context, jobName string) (int64, error) {
return c.pgMetadata.FetchLastOffset(ctx, jobName)
}
func (c *KafkaConnector) SetLastOffset(ctx context.Context, jobName string, offset int64) error {
return c.pgMetadata.UpdateLastOffset(ctx, jobName, offset)
}
func (c *KafkaConnector) NeedsSetupMetadataTables(_ context.Context) bool {
return false
}
func (c *KafkaConnector) SetupMetadataTables(_ context.Context) error {
return nil
}
func (c *KafkaConnector) ReplayTableSchemaDeltas(_ context.Context, flowJobName string, schemaDeltas []*protos.TableSchemaDelta) error {
c.logger.Info("ReplayTableSchemaDeltas for event hub is a no-op")
return nil
}
func (c *KafkaConnector) SyncFlowCleanup(ctx context.Context, jobName string) error {
return c.pgMetadata.DropMetadata(ctx, jobName)
}
var (
LuaRecord = pua.LuaUserDataType[model.Record]{Name: "peerdb_row"}
LuaQValue = pua.LuaUserDataType[qvalue.QValue]{Name: "peerdb_qvalue"}
)
func RegisterTypes(ls *lua.LState) {
mt := ls.NewTypeMetatable(LuaRecord.Name)
ls.SetField(mt, "__index", ls.NewFunction(LuaRecordIndex))
mt = ls.NewTypeMetatable(LuaQValue.Name)
ls.SetField(mt, "__index", ls.NewFunction(LuaQValueIndex))
ls.SetField(mt, "__len", ls.NewFunction(LuaQValueLen))
}
func LuaRecordIndex(ls *lua.LState) int {
record, key := LuaRecord.StartIndex(ls)
recordItems := record.GetItems()
qv, err := recordItems.GetValueByColName(key)
if err != nil {
ls.Error(lua.LString(err.Error()), 0)
}
ls.Push(LuaQValue.New(ls, qv))
return 1
}
func LuaQValueIndex(ls *lua.LState) int {
qv, key := LuaQValue.StartIndex(ls)
if key == "kind" {
ls.Push(lua.LString(qv.Kind))
return 1
}
return 0
}
func LuaQValueLen(ls *lua.LState) int {
qv := LuaQValue.StartMeta(ls)
str, ok := qv.Value.(string)
if ok {
ls.Push(lua.LNumber(len(str)))
return 1
}
if strings.HasPrefix(string(qv.Kind), "array_") {
ls.Push(lua.LNumber(reflect.ValueOf(qv.Value).Len()))
return 1
}
return 0
}
func (c *KafkaConnector) SyncRecords(ctx context.Context, req *model.SyncRecordsRequest) (*model.SyncResponse, error) {
err := c.client.BeginTransaction()
if err != nil {
return nil, err
}
var wg sync.WaitGroup
wgCtx, wgErr := context.WithCancelCause(ctx)
produceCb := func(r *kgo.Record, err error) {
if err != nil {
wgErr(err)
}
wg.Done()
}
numRecords := int64(0)
tableNameRowsMapping := make(map[string]uint32)
var fn *lua.LFunction
var ls *lua.LState
if req.Script != "" {
ls = lua.NewState(lua.Options{SkipOpenLibs: true})
defer ls.Close()
ls.SetContext(wgCtx)
for _, pair := range []struct {
n string
f lua.LGFunction
}{
{lua.LoadLibName, lua.OpenPackage}, // Must be first
{lua.BaseLibName, lua.OpenBase},
{lua.TabLibName, lua.OpenTable},
{lua.StringLibName, lua.OpenString},
{lua.MathLibName, lua.OpenMath},
} {
ls.Push(ls.NewFunction(pair.f))
ls.Push(lua.LString(pair.n))
err := ls.PCall(1, 0, nil)
if err != nil {
return nil, fmt.Errorf("failed to initialize Lua runtime: %w", err)
}
}
ls.PreloadModule("flatbuffers", pua.FlatBuffers_Loader)
ls.PreloadModule("flatbuffers.binaryarray", pua.FlatBuffers_BinaryArray_Loader)
err := ls.DoString(req.Script)
if err != nil {
return nil, fmt.Errorf("error while executing script: %w", err)
}
var ok bool
fn, ok = ls.GetGlobal("onRow").(*lua.LFunction)
if !ok {
return nil, errors.New("script should define `onRow` function")
}
} else {
return nil, errors.New("kafka mirror must have script")
}
for record := range req.Records.GetRecords() {
if err := wgCtx.Err(); err != nil {
return nil, err
}
topic := record.GetDestinationTableName()
ls.Push(fn)
ls.Push(LuaRecord.New(ls, record))
err := ls.PCall(1, 1, nil)
if err != nil {
return nil, fmt.Errorf("script failed: %w", err)
}
value := ls.CheckString(-1)
wg.Add(1)
c.client.Produce(wgCtx, &kgo.Record{Topic: topic, Value: []byte(value)}, produceCb)
numRecords += 1
tableNameRowsMapping[topic] += 1
}
// TODO handle
waitChan := make(chan struct{})
go func() {
wg.Wait()
waitChan <- struct{}{}
}()
select {
case <-wgCtx.Done():
return nil, wgCtx.Err()
case <-waitChan:
}
if err := c.client.Flush(ctx); err != nil {
return nil, fmt.Errorf("could not flush transaction: %w", err)
}
if err := c.client.EndTransaction(ctx, kgo.TryCommit); err != nil {
return nil, fmt.Errorf("could not commit transaction: %w", err)
}
lastCheckpoint := req.Records.GetLastCheckpoint()
err = c.pgMetadata.FinishBatch(ctx, req.FlowJobName, req.SyncBatchID, lastCheckpoint)
if err != nil {
return nil, err
}
return &model.SyncResponse{
CurrentSyncBatchID: req.SyncBatchID,
LastSyncedCheckpointID: lastCheckpoint,
NumRecordsSynced: numRecords,
TableNameRowsMapping: tableNameRowsMapping,
TableSchemaDeltas: req.Records.SchemaDeltas,
}, nil
}