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main.go
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main.go
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package main
import (
"context"
"encoding/json"
"errors"
"flag"
"fmt"
"log"
"net"
"os"
"path/filepath"
"github.com/pojntfx/go-nbd/pkg/backend"
"github.com/pojntfx/go-nbd/pkg/client"
"github.com/pojntfx/panrpc/go/pkg/rpc"
v1frpc "github.com/pojntfx/r3map/pkg/api/frpc/mount/v1"
v1proto "github.com/pojntfx/r3map/pkg/api/proto/mount/v1"
lbackend "github.com/pojntfx/r3map/pkg/backend"
"github.com/pojntfx/r3map/pkg/chunks"
"github.com/pojntfx/r3map/pkg/services"
"github.com/pojntfx/r3map/pkg/utils"
"google.golang.org/grpc"
)
const (
backendTypeFile = "file"
backendTypeMemory = "memory"
backendTypeDirectory = "directory"
)
var (
knownBackendTypes = []string{backendTypeFile, backendTypeMemory, backendTypeDirectory}
errUnknownBackend = errors.New("unknown backend")
)
func main() {
laddr := flag.String("addr", ":1337", "Listen address")
enableGrpc := flag.Bool("grpc", false, "Whether to use gRPC instead of panrpc")
enableFrpc := flag.Bool("frpc", false, "Whether to use fRPC instead of panrpc")
verbose := flag.Bool("verbose", false, "Whether to enable verbose logging")
size := flag.Int64("size", 536870912, "Size of the memory region or file to allocate")
chunkSize := flag.Int64("chunk-size", client.MaximumBlockSize, "Chunk size to use")
maxChunkSize := flag.Int64("max-chunk-size", services.MaxChunkSize, "Maximum chunk size to support")
bck := flag.String(
"backend",
backendTypeFile,
fmt.Sprintf(
"Backend to use (one of %v)",
knownBackendTypes,
),
)
location := flag.String("location", filepath.Join(os.TempDir(), "local"), "Backend's directory (for directory backend)")
chunking := flag.Bool("chunking", false, "Whether the backend requires to be interfaced with in fixed chunks")
flag.Parse()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
var b backend.Backend
switch *bck {
case backendTypeMemory:
b = backend.NewMemoryBackend(make([]byte, *size))
case backendTypeFile:
file, err := os.CreateTemp("", "")
if err != nil {
panic(err)
}
defer os.RemoveAll(file.Name())
if err := file.Truncate(*size); err != nil {
panic(err)
}
b = backend.NewFileBackend(file)
case backendTypeDirectory:
if err := os.MkdirAll(*location, os.ModePerm); err != nil {
panic(err)
}
b = lbackend.NewDirectoryBackend(*location, *size, *chunkSize, 512, false)
default:
panic(errUnknownBackend)
}
if *chunking {
b = lbackend.NewReaderAtBackend(
chunks.NewArbitraryReadWriterAt(
b,
*chunkSize,
),
(b).Size,
(b).Sync,
false,
)
}
var (
svc = services.NewBackend(b, *verbose, *maxChunkSize)
errs = make(chan error)
)
if *enableGrpc {
server := grpc.NewServer()
v1proto.RegisterBackendServer(server, services.NewBackendServiceGrpc(svc))
lis, err := net.Listen("tcp", *laddr)
if err != nil {
panic(err)
}
defer lis.Close()
log.Println("Listening on", lis.Addr())
go func() {
if err := server.Serve(lis); err != nil {
if !utils.IsClosedErr(err) {
errs <- err
}
return
}
}()
} else if *enableFrpc {
server, err := v1frpc.NewServer(services.NewBackendServiceFrpc(svc), nil, nil)
if err != nil {
panic(err)
}
log.Println("Listening on", *laddr)
go func() {
if err := server.Start(*laddr); err != nil {
if !utils.IsClosedErr(err) {
errs <- err
}
return
}
}()
} else {
clients := 0
registry := rpc.NewRegistry[struct{}, json.RawMessage](
svc,
&rpc.RegistryHooks{
OnClientConnect: func(remoteID string) {
clients++
log.Printf("%v clients connected", clients)
},
OnClientDisconnect: func(remoteID string) {
clients--
log.Printf("%v clients connected", clients)
},
},
)
lis, err := net.Listen("tcp", *laddr)
if err != nil {
panic(err)
}
defer lis.Close()
log.Println("Listening on", lis.Addr())
go func() {
for {
conn, err := lis.Accept()
if err != nil {
if !utils.IsClosedErr(err) {
log.Println("could not accept connection, continuing:", err)
}
continue
}
go func() {
defer func() {
_ = conn.Close()
if err := recover(); err != nil {
if !utils.IsClosedErr(err.(error)) {
log.Printf("Client disconnected with error: %v", err)
}
}
}()
linkCtx, cancelLinkCtx := context.WithCancel(ctx)
defer cancelLinkCtx()
encoder := json.NewEncoder(conn)
decoder := json.NewDecoder(conn)
if err := registry.LinkStream(
linkCtx,
func(v rpc.Message[json.RawMessage]) error {
return encoder.Encode(v)
},
func(v *rpc.Message[json.RawMessage]) error {
return decoder.Decode(v)
},
func(v any) (json.RawMessage, error) {
b, err := json.Marshal(v)
if err != nil {
return nil, err
}
return json.RawMessage(b), nil
},
func(data json.RawMessage, v any) error {
return json.Unmarshal([]byte(data), v)
},
&rpc.LinkHooks{},
); err != nil {
panic(err)
}
}()
}
}()
}
for err := range errs {
if err != nil {
panic(err)
}
}
}