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online_features.go
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online_features.go
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package embedded
import (
"context"
"fmt"
"log"
"net"
"os"
"os/signal"
"syscall"
"time"
"github.com/apache/arrow/go/v8/arrow"
"github.com/apache/arrow/go/v8/arrow/array"
"github.com/apache/arrow/go/v8/arrow/cdata"
"github.com/apache/arrow/go/v8/arrow/memory"
"google.golang.org/grpc"
"github.com/feast-dev/feast/go/internal/feast"
"github.com/feast-dev/feast/go/internal/feast/model"
"github.com/feast-dev/feast/go/internal/feast/onlineserving"
"github.com/feast-dev/feast/go/internal/feast/registry"
"github.com/feast-dev/feast/go/internal/feast/server"
"github.com/feast-dev/feast/go/internal/feast/server/logging"
"github.com/feast-dev/feast/go/internal/feast/transformation"
"github.com/feast-dev/feast/go/protos/feast/serving"
prototypes "github.com/feast-dev/feast/go/protos/feast/types"
"github.com/feast-dev/feast/go/types"
)
type OnlineFeatureService struct {
fs *feast.FeatureStore
grpcStopCh chan os.Signal
httpStopCh chan os.Signal
statusColumnBuildersToRelease []*array.Int32Builder
tsColumnBuildersToRelease []*array.Int64Builder
arraysToRelease []arrow.Array
resultsToRelease []arrow.Record
err error
}
type OnlineFeatureServiceConfig struct {
RepoPath string
RepoConfig string
}
type DataTable struct {
DataPtr uintptr
SchemaPtr uintptr
}
// LoggingOptions is a public (embedded) copy of logging.LoggingOptions struct.
// See logging.LoggingOptions for properties description
type LoggingOptions struct {
ChannelCapacity int
EmitTimeout time.Duration
WriteInterval time.Duration
FlushInterval time.Duration
}
func NewOnlineFeatureService(conf *OnlineFeatureServiceConfig, transformationCallback transformation.TransformationCallback) *OnlineFeatureService {
repoConfig, err := registry.NewRepoConfigFromJSON(conf.RepoPath, conf.RepoConfig)
if err != nil {
return &OnlineFeatureService{
err: err,
}
}
fs, err := feast.NewFeatureStore(repoConfig, transformationCallback)
if err != nil {
return &OnlineFeatureService{
err: err,
}
}
// Notify these channels when receiving interrupt or termination signals from OS
httpStopCh := make(chan os.Signal, 1)
grpcStopCh := make(chan os.Signal, 1)
signal.Notify(httpStopCh, syscall.SIGINT, syscall.SIGTERM)
signal.Notify(grpcStopCh, syscall.SIGINT, syscall.SIGTERM)
return &OnlineFeatureService{fs: fs, httpStopCh: httpStopCh, grpcStopCh: grpcStopCh}
}
func (s *OnlineFeatureService) GetEntityTypesMap(featureRefs []string) (map[string]int32, error) {
viewNames := make(map[string]interface{})
for _, featureRef := range featureRefs {
viewName, _, err := onlineserving.ParseFeatureReference(featureRef)
if err != nil {
return nil, err
}
viewNames[viewName] = nil
}
joinKeyTypes := make(map[string]int32)
for viewName := range viewNames {
view, err := s.fs.GetFeatureView(viewName, true)
if err != nil {
// skip on demand feature views
continue
}
for _, entityColumn := range view.EntityColumns {
joinKeyTypes[entityColumn.Name] = int32(entityColumn.Dtype.Number())
}
}
return joinKeyTypes, nil
}
func (s *OnlineFeatureService) GetEntityTypesMapByFeatureService(featureServiceName string) (map[string]int32, error) {
featureService, err := s.fs.GetFeatureService(featureServiceName)
if err != nil {
return nil, err
}
joinKeyTypes := make(map[string]int32)
for _, projection := range featureService.Projections {
view, err := s.fs.GetFeatureView(projection.Name, true)
if err != nil {
// skip on demand feature views
continue
}
for _, entityColumn := range view.EntityColumns {
joinKeyTypes[entityColumn.Name] = int32(entityColumn.Dtype.Number())
}
}
return joinKeyTypes, nil
}
func (s *OnlineFeatureService) CheckForInstantiationError() error {
return s.err
}
func (s *OnlineFeatureService) GetOnlineFeatures(
featureRefs []string,
featureServiceName string,
entities DataTable,
requestData DataTable,
fullFeatureNames bool,
output DataTable) error {
entitiesRecord, err := readArrowRecord(entities)
if err != nil {
return err
}
defer entitiesRecord.Release()
numRows := entitiesRecord.Column(0).Len()
entitiesProto, err := recordToProto(entitiesRecord)
if err != nil {
return err
}
requestDataRecords, err := readArrowRecord(requestData)
if err != nil {
return err
}
defer requestDataRecords.Release()
requestDataProto, err := recordToProto(requestDataRecords)
if err != nil {
return err
}
var featureService *model.FeatureService
if featureServiceName != "" {
featureService, err = s.fs.GetFeatureService(featureServiceName)
}
resp, err := s.fs.GetOnlineFeatures(
context.Background(),
featureRefs,
featureService,
entitiesProto,
requestDataProto,
fullFeatureNames)
if err != nil {
return err
}
// Release all objects that are no longer required.
for _, statusColumnBuilderToRelease := range s.statusColumnBuildersToRelease {
statusColumnBuilderToRelease.Release()
}
for _, tsColumnBuilderToRelease := range s.tsColumnBuildersToRelease {
tsColumnBuilderToRelease.Release()
}
for _, arrayToRelease := range s.arraysToRelease {
arrayToRelease.Release()
}
for _, resultsToRelease := range s.resultsToRelease {
resultsToRelease.Release()
}
s.statusColumnBuildersToRelease = nil
s.tsColumnBuildersToRelease = nil
s.arraysToRelease = nil
s.resultsToRelease = nil
outputFields := make([]arrow.Field, 0)
outputColumns := make([]arrow.Array, 0)
pool := memory.NewCgoArrowAllocator()
for _, featureVector := range resp {
outputFields = append(outputFields,
arrow.Field{
Name: featureVector.Name,
Type: featureVector.Values.DataType()})
outputFields = append(outputFields,
arrow.Field{
Name: fmt.Sprintf("%s__status", featureVector.Name),
Type: arrow.PrimitiveTypes.Int32})
outputFields = append(outputFields,
arrow.Field{
Name: fmt.Sprintf("%s__timestamp", featureVector.Name),
Type: arrow.PrimitiveTypes.Int64})
outputColumns = append(outputColumns, featureVector.Values)
statusColumnBuilder := array.NewInt32Builder(pool)
for _, status := range featureVector.Statuses {
statusColumnBuilder.Append(int32(status))
}
statusColumn := statusColumnBuilder.NewArray()
outputColumns = append(outputColumns, statusColumn)
tsColumnBuilder := array.NewInt64Builder(pool)
for _, ts := range featureVector.Timestamps {
tsColumnBuilder.Append(ts.GetSeconds())
}
tsColumn := tsColumnBuilder.NewArray()
outputColumns = append(outputColumns, tsColumn)
// Mark builders and arrays for release.
s.statusColumnBuildersToRelease = append(s.statusColumnBuildersToRelease, statusColumnBuilder)
s.tsColumnBuildersToRelease = append(s.tsColumnBuildersToRelease, tsColumnBuilder)
s.arraysToRelease = append(s.arraysToRelease, statusColumn)
s.arraysToRelease = append(s.arraysToRelease, tsColumn)
s.arraysToRelease = append(s.arraysToRelease, featureVector.Values)
}
result := array.NewRecord(arrow.NewSchema(outputFields, nil), outputColumns, int64(numRows))
s.resultsToRelease = append(s.resultsToRelease, result)
cdata.ExportArrowRecordBatch(result, cdata.ArrayFromPtr(output.DataPtr), cdata.SchemaFromPtr(output.SchemaPtr))
return nil
}
// StartGprcServer starts gRPC server with disabled feature logging and blocks the thread
func (s *OnlineFeatureService) StartGprcServer(host string, port int) error {
return s.StartGprcServerWithLogging(host, port, nil, LoggingOptions{})
}
// StartGprcServerWithLoggingDefaultOpts starts gRPC server with enabled feature logging but default configuration for logging
// Caller of this function must provide Python callback to flush buffered logs
func (s *OnlineFeatureService) StartGprcServerWithLoggingDefaultOpts(host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback) error {
defaultOpts := LoggingOptions{
ChannelCapacity: logging.DefaultOptions.ChannelCapacity,
EmitTimeout: logging.DefaultOptions.EmitTimeout,
WriteInterval: logging.DefaultOptions.WriteInterval,
FlushInterval: logging.DefaultOptions.FlushInterval,
}
return s.StartGprcServerWithLogging(host, port, writeLoggedFeaturesCallback, defaultOpts)
}
func (s *OnlineFeatureService) constructLoggingService(writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts LoggingOptions) (*logging.LoggingService, error) {
var loggingService *logging.LoggingService = nil
if writeLoggedFeaturesCallback != nil {
sink, err := logging.NewOfflineStoreSink(writeLoggedFeaturesCallback)
if err != nil {
return nil, err
}
loggingService, err = logging.NewLoggingService(s.fs, sink, logging.LoggingOptions{
ChannelCapacity: loggingOpts.ChannelCapacity,
EmitTimeout: loggingOpts.EmitTimeout,
WriteInterval: loggingOpts.WriteInterval,
FlushInterval: loggingOpts.FlushInterval,
})
if err != nil {
return nil, err
}
}
return loggingService, nil
}
// StartGprcServerWithLogging starts gRPC server with enabled feature logging
// Caller of this function must provide Python callback to flush buffered logs as well as logging configuration (loggingOpts)
func (s *OnlineFeatureService) StartGprcServerWithLogging(host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts LoggingOptions) error {
loggingService, err := s.constructLoggingService(writeLoggedFeaturesCallback, loggingOpts)
if err != nil {
return err
}
ser := server.NewGrpcServingServiceServer(s.fs, loggingService)
log.Printf("Starting a gRPC server on host %s port %d\n", host, port)
lis, err := net.Listen("tcp", fmt.Sprintf("%s:%d", host, port))
if err != nil {
return err
}
grpcServer := grpc.NewServer()
serving.RegisterServingServiceServer(grpcServer, ser)
go func() {
// As soon as these signals are received from OS, try to gracefully stop the gRPC server
<-s.grpcStopCh
log.Println("Stopping the gRPC server...")
grpcServer.GracefulStop()
if loggingService != nil {
loggingService.Stop()
}
log.Println("gRPC server terminated")
}()
err = grpcServer.Serve(lis)
if err != nil {
return err
}
return nil
}
// StartHttpServer starts HTTP server with disabled feature logging and blocks the thread
func (s *OnlineFeatureService) StartHttpServer(host string, port int) error {
return s.StartHttpServerWithLogging(host, port, nil, LoggingOptions{})
}
// StartHttpServerWithLoggingDefaultOpts starts HTTP server with enabled feature logging but default configuration for logging
// Caller of this function must provide Python callback to flush buffered logs
func (s *OnlineFeatureService) StartHttpServerWithLoggingDefaultOpts(host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback) error {
defaultOpts := LoggingOptions{
ChannelCapacity: logging.DefaultOptions.ChannelCapacity,
EmitTimeout: logging.DefaultOptions.EmitTimeout,
WriteInterval: logging.DefaultOptions.WriteInterval,
FlushInterval: logging.DefaultOptions.FlushInterval,
}
return s.StartHttpServerWithLogging(host, port, writeLoggedFeaturesCallback, defaultOpts)
}
// StartHttpServerWithLogging starts HTTP server with enabled feature logging
// Caller of this function must provide Python callback to flush buffered logs as well as logging configuration (loggingOpts)
func (s *OnlineFeatureService) StartHttpServerWithLogging(host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts LoggingOptions) error {
loggingService, err := s.constructLoggingService(writeLoggedFeaturesCallback, loggingOpts)
if err != nil {
return err
}
ser := server.NewHttpServer(s.fs, loggingService)
log.Printf("Starting a HTTP server on host %s port %d\n", host, port)
go func() {
// As soon as these signals are received from OS, try to gracefully stop the gRPC server
<-s.httpStopCh
log.Println("Stopping the HTTP server...")
err := ser.Stop()
if err != nil {
log.Printf("Error when stopping the HTTP server: %v\n", err)
}
if loggingService != nil {
loggingService.Stop()
}
log.Println("HTTP server terminated")
}()
return ser.Serve(host, port)
}
func (s *OnlineFeatureService) StopHttpServer() {
s.httpStopCh <- syscall.SIGINT
}
func (s *OnlineFeatureService) StopGrpcServer() {
s.grpcStopCh <- syscall.SIGINT
}
/*
Read Record Batch from memory managed by Python caller.
Python part uses C ABI interface to export this record into C Data Interface,
and then it provides pointers (dataPtr & schemaPtr) to the Go part.
Here we import this data from given pointers and wrap the underlying values
into Go Arrow Interface (array.Record).
See export code here https://github.com/feast-dev/feast/blob/master/sdk/python/feast/embedded_go/online_features_service.py
*/
func readArrowRecord(data DataTable) (arrow.Record, error) {
return cdata.ImportCRecordBatch(
cdata.ArrayFromPtr(data.DataPtr),
cdata.SchemaFromPtr(data.SchemaPtr))
}
func recordToProto(rec arrow.Record) (map[string]*prototypes.RepeatedValue, error) {
r := make(map[string]*prototypes.RepeatedValue)
schema := rec.Schema()
for idx, column := range rec.Columns() {
field := schema.Field(idx)
values, err := types.ArrowValuesToProtoValues(column)
if err != nil {
return nil, err
}
r[field.Name] = &prototypes.RepeatedValue{Val: values}
}
return r, nil
}