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package main
import (
"context"
"flag"
"fmt"
"net"
"os"
"os/signal"
"strings"
"syscall"
"github.com/feast-dev/feast/go/internal/feast"
"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/protos/feast/serving"
"github.com/rs/zerolog/log"
"google.golang.org/grpc"
"google.golang.org/grpc/health"
"google.golang.org/grpc/health/grpc_health_v1"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.37.0"
"go.opentelemetry.io/otel/trace"
)
var tracer trace.Tracer
type ServerStarter interface {
StartHttpServer(fs *feast.FeatureStore, host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts *logging.LoggingOptions) error
StartGrpcServer(fs *feast.FeatureStore, host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts *logging.LoggingOptions) error
}
type RealServerStarter struct{}
func (s *RealServerStarter) StartHttpServer(fs *feast.FeatureStore, host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts *logging.LoggingOptions) error {
return StartHttpServer(fs, host, port, writeLoggedFeaturesCallback, loggingOpts)
}
func (s *RealServerStarter) StartGrpcServer(fs *feast.FeatureStore, host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts *logging.LoggingOptions) error {
return StartGrpcServer(fs, host, port, writeLoggedFeaturesCallback, loggingOpts)
}
func main() {
// Default values
serverType := "http"
host := ""
port := 8080
server := RealServerStarter{}
// Current Directory
repoPath, err := os.Getwd()
if err != nil {
log.Error().Stack().Err(err).Msg("Failed to get current directory")
}
flag.StringVar(&serverType, "type", serverType, "Specify the server type (http or grpc)")
flag.StringVar(&repoPath, "chdir", repoPath, "Repository path where feature store yaml file is stored")
flag.StringVar(&host, "host", host, "Specify a host for the server")
flag.IntVar(&port, "port", port, "Specify a port for the server")
flag.Parse()
// Initialize tracer
if OTELTracingEnabled() {
ctx := context.Background()
exp, err := newExporter(ctx)
if err != nil {
log.Fatal().Stack().Err(err).Msg("Failed to initialize exporter.")
}
// Create a new tracer provider with a batch span processor and the given exporter.
tp, err := newTracerProvider(exp)
if err != nil {
log.Fatal().Stack().Err(err).Msg("Failed to initialize tracer provider.")
}
// Handle shutdown properly so nothing leaks.
defer func() { _ = tp.Shutdown(ctx) }()
otel.SetTracerProvider(tp)
// Finally, set the tracer that can be used for this package.
tracer = tp.Tracer("github.com/feast-dev/feast/go")
log.Info().Msg("OTEL based tracing started.")
}
repoConfig, err := registry.NewRepoConfigFromFile(repoPath)
if err != nil {
log.Fatal().Stack().Err(err).Msg("Failed to convert to RepoConfig")
}
fs, err := feast.NewFeatureStore(repoConfig, nil)
if err != nil {
log.Fatal().Stack().Err(err).Msg("Failed to create NewFeatureStore")
}
loggingOptions, err := repoConfig.GetLoggingOptions()
if err != nil {
log.Fatal().Stack().Err(err).Msg("Failed to get LoggingOptions")
}
// TODO: writeLoggedFeaturesCallback is defaulted to nil. write_logged_features functionality needs to be
// implemented in Golang specific to OfflineStoreSink. Python Feature Server doesn't support this.
if serverType == "http" {
err = server.StartHttpServer(fs, host, port, nil, loggingOptions)
} else if serverType == "grpc" {
err = server.StartGrpcServer(fs, host, port, nil, loggingOptions)
} else {
fmt.Println("Unknown server type. Please specify 'http' or 'grpc'.")
}
if err != nil {
log.Fatal().Stack().Err(err).Msg("Failed to start server")
}
}
func constructLoggingService(fs *feast.FeatureStore, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts *logging.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(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
func StartGrpcServer(fs *feast.FeatureStore, host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts *logging.LoggingOptions) error {
loggingService, err := constructLoggingService(fs, writeLoggedFeaturesCallback, loggingOpts)
if err != nil {
return err
}
ser := server.NewGrpcServingServiceServer(fs, loggingService)
log.Info().Msgf("Starting a gRPC server on host %s port %d", 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)
healthService := health.NewServer()
grpc_health_v1.RegisterHealthServer(grpcServer, healthService)
stop := make(chan os.Signal, 1)
signal.Notify(stop, syscall.SIGINT, syscall.SIGTERM)
go func() {
// As soon as these signals are received from OS, try to gracefully stop the gRPC server
<-stop
log.Info().Msg("Stopping the gRPC server...")
grpcServer.GracefulStop()
if loggingService != nil {
loggingService.Stop()
}
log.Info().Msg("gRPC server terminated")
}()
return grpcServer.Serve(lis)
}
// StartHttpServerWithLogging starts HTTP server with enabled feature logging
// Go does not allow direct assignment to package-level functions as a way to
// mock them for tests
func StartHttpServer(fs *feast.FeatureStore, host string, port int, writeLoggedFeaturesCallback logging.OfflineStoreWriteCallback, loggingOpts *logging.LoggingOptions) error {
loggingService, err := constructLoggingService(fs, writeLoggedFeaturesCallback, loggingOpts)
if err != nil {
return err
}
ser := server.NewHttpServer(fs, loggingService)
log.Info().Msgf("Starting a HTTP server on host %s, port %d", host, port)
stop := make(chan os.Signal, 1)
signal.Notify(stop, syscall.SIGINT, syscall.SIGTERM)
go func() {
// As soon as these signals are received from OS, try to gracefully stop the gRPC server
<-stop
log.Info().Msg("Stopping the HTTP server...")
err := ser.Stop()
if err != nil {
log.Error().Err(err).Msg("Error when stopping the HTTP server")
}
if loggingService != nil {
loggingService.Stop()
}
log.Info().Msg("HTTP server terminated")
}()
return ser.Serve(host, port)
}
func OTELTracingEnabled() bool {
return strings.ToLower(os.Getenv("ENABLE_OTEL_TRACING")) == "true"
}
func newExporter(ctx context.Context) (*otlptrace.Exporter, error) {
exp, err := otlptracehttp.New(ctx,
otlptracehttp.WithInsecure())
if err != nil {
return nil, err
}
return exp, nil
}
func newTracerProvider(exp sdktrace.SpanExporter) (*sdktrace.TracerProvider, error) {
r, err := resource.Merge(
resource.Default(),
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceName("FeastGoFeatureServer"),
),
)
if err != nil {
return nil, err
}
return sdktrace.NewTracerProvider(
sdktrace.WithBatcher(exp),
sdktrace.WithResource(r),
), nil
}