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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"io"
"log"
"net"
pb "github.com/adityachandla/graph_access_service/generated"
"github.com/adityachandla/graph_access_service/graphaccess"
"github.com/adityachandla/graph_access_service/storage"
"google.golang.org/grpc"
)
//go:generate protoc --go-grpc_out=generated --go_out=generated --go_opt=paths=source_relative --go-grpc_opt=paths=source_relative graph_access.proto
var (
port = flag.Int("port", 20301, "The server port")
fsType = flag.String("fstype", "s3", "Filesystem type s3/local")
bucket = flag.String("bucket", "s3graphtest1", "Path to the s3 bucket")
noLog = flag.Bool("nolog", false, "Turn off logging")
region = flag.String("region", "eu-west-1", "AWS Region")
accessor = flag.String("accessor", "prefetch", "Possible values are: prefetch/offset/simple")
)
type server struct {
pb.UnimplementedGraphAccessServer
accessService graphaccess.GraphAccess
}
func (s *server) GetNeighbours(_ context.Context, req *pb.AccessRequest) (*pb.AccessResponse, error) {
log.Printf("Processing reqest %v\n", req)
request := graphaccess.Request{
Node: req.NodeId,
Label: req.Label,
Direction: mapDirection(req.Direction),
}
response := &pb.AccessResponse{Neighbours: s.accessService.GetNeighbours(request)}
response.Status = pb.AccessResponse_NO_ERROR
return response, nil
}
func (s *server) GetStats(_ context.Context, _ *pb.StatsRequest) (*pb.Stats, error) {
return &pb.Stats{Stats: s.accessService.GetStats()}, nil
}
func mapDirection(dir pb.AccessRequest_Direction) graphaccess.Direction {
if dir == pb.AccessRequest_OUTGOING {
return graphaccess.OUTGOING
} else if dir == pb.AccessRequest_INCOMING {
return graphaccess.INCOMING
}
return graphaccess.BOTH
}
func main() {
flag.Parse()
if *noLog {
log.SetFlags(0)
log.SetOutput(io.Discard)
}
fetcher := getFetcher()
accessService := getAccessService(fetcher)
log.Println("Initialized access service")
s := &server{accessService: accessService}
startServer(s)
}
func startServer(ser *server) {
//Server start
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
if err != nil {
panic(err)
}
s := grpc.NewServer()
pb.RegisterGraphAccessServer(s, ser)
log.Printf("Server listening at %v", lis.Addr())
if err := s.Serve(lis); err != nil {
log.Fatalf("Unable to serve request: %v", err)
}
}
func getFetcher() storage.Fetcher {
if *fsType == "s3" {
return storage.InitializeS3Service(*bucket, *region)
} else if *fsType == "local" {
return storage.InitializeFsService(*bucket)
} else {
panic("Invalid filesystem type")
}
}
func getAccessService(fetcher storage.Fetcher) graphaccess.GraphAccess {
if *accessor == "simple" {
return graphaccess.NewSimpleCsr(fetcher)
} else if *accessor == "offset" {
return graphaccess.NewOffsetCsr(fetcher)
} else if *accessor == "prefetch" {
return graphaccess.NewPrefetchCsr(fetcher)
} else {
panic("Invalid accessor")
}
}