You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
159 lines
4.0 KiB
159 lines
4.0 KiB
package grpcdb
|
|
|
|
import (
|
|
"context"
|
|
"log"
|
|
"net"
|
|
"sync"
|
|
"time"
|
|
|
|
"google.golang.org/grpc"
|
|
|
|
"github.com/tendermint/tmlibs/db"
|
|
protodb "github.com/tendermint/tmlibs/proto"
|
|
)
|
|
|
|
// BindServer is a blocking function that sets up a gRPC based
|
|
// server at the address supplied, with the gRPC options passed in.
|
|
// Normally in usage, invoke it in a goroutine like you would for http.ListenAndServe.
|
|
func BindServer(addr string, opts ...grpc.ServerOption) error {
|
|
ln, err := net.Listen("tcp", addr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
srv := grpc.NewServer(opts...)
|
|
protodb.RegisterDBServer(srv, new(server))
|
|
return srv.Serve(ln)
|
|
}
|
|
|
|
type server struct {
|
|
mu sync.Mutex
|
|
db db.DB
|
|
}
|
|
|
|
var _ protodb.DBServer = (*server)(nil)
|
|
|
|
// Init initializes the server's database. Only one type of database
|
|
// can be initialized per server.
|
|
//
|
|
// Dir is the directory on the file system in which the DB will be stored(if backed by disk) (TODO: remove)
|
|
//
|
|
// Name is representative filesystem entry's basepath
|
|
//
|
|
// Type can be either one of:
|
|
// * cleveldb (if built with gcc enabled)
|
|
// * fsdb
|
|
// * memdB
|
|
// * leveldb
|
|
// See https://godoc.org/github.com/tendermint/tmlibs/db#DBBackendType
|
|
func (s *server) Init(ctx context.Context, in *protodb.Init) (*protodb.Entity, error) {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
log.Printf("in: %+v\n", in)
|
|
s.db = db.NewDB(in.Name, db.DBBackendType(in.Type), in.Dir)
|
|
return &protodb.Entity{TimeAt: time.Now().Unix()}, nil
|
|
}
|
|
|
|
func (s *server) Delete(ctx context.Context, in *protodb.Entity) (*protodb.Nothing, error) {
|
|
s.db.Delete(in.Key)
|
|
return nothing, nil
|
|
}
|
|
|
|
var nothing = new(protodb.Nothing)
|
|
|
|
func (s *server) DeleteSync(ctx context.Context, in *protodb.Entity) (*protodb.Nothing, error) {
|
|
s.db.DeleteSync(in.Key)
|
|
return nothing, nil
|
|
}
|
|
|
|
func (s *server) Get(ctx context.Context, in *protodb.Entity) (*protodb.Entity, error) {
|
|
value := s.db.Get(in.Key)
|
|
return &protodb.Entity{Value: value}, nil
|
|
}
|
|
|
|
func (s *server) GetStream(ds protodb.DB_GetStreamServer) error {
|
|
// Receive routine
|
|
responsesChan := make(chan *protodb.Entity)
|
|
go func() {
|
|
defer close(responsesChan)
|
|
ctx := context.Background()
|
|
for {
|
|
in, err := ds.Recv()
|
|
if err != nil {
|
|
responsesChan <- &protodb.Entity{Err: err.Error()}
|
|
return
|
|
}
|
|
out, err := s.Get(ctx, in)
|
|
if err != nil {
|
|
if out == nil {
|
|
out = new(protodb.Entity)
|
|
out.Key = in.Key
|
|
}
|
|
out.Err = err.Error()
|
|
responsesChan <- out
|
|
return
|
|
}
|
|
|
|
// Otherwise continue on
|
|
responsesChan <- out
|
|
}
|
|
}()
|
|
|
|
// Send routine, block until we return
|
|
for out := range responsesChan {
|
|
if err := ds.Send(out); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *server) Has(ctx context.Context, in *protodb.Entity) (*protodb.Entity, error) {
|
|
exists := s.db.Has(in.Key)
|
|
return &protodb.Entity{Exists: exists}, nil
|
|
}
|
|
|
|
func (s *server) Set(ctx context.Context, in *protodb.Entity) (*protodb.Nothing, error) {
|
|
s.db.Set(in.Key, in.Value)
|
|
return nothing, nil
|
|
}
|
|
|
|
func (s *server) SetSync(ctx context.Context, in *protodb.Entity) (*protodb.Nothing, error) {
|
|
s.db.SetSync(in.Key, in.Value)
|
|
return nothing, nil
|
|
}
|
|
|
|
func (s *server) Iterator(query *protodb.Entity, dis protodb.DB_IteratorServer) error {
|
|
it := s.db.Iterator(query.Start, query.End)
|
|
return s.handleIterator(it, dis.Send)
|
|
}
|
|
|
|
func (s *server) handleIterator(it db.Iterator, sendFunc func(*protodb.Iterator) error) error {
|
|
for it.Valid() {
|
|
start, end := it.Domain()
|
|
out := &protodb.Iterator{
|
|
Domain: &protodb.DDomain{Start: start, End: end},
|
|
Valid: it.Valid(),
|
|
Key: it.Key(),
|
|
Value: it.Value(),
|
|
}
|
|
if err := sendFunc(out); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Finally move the iterator forward
|
|
it.Next()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *server) ReverseIterator(query *protodb.Entity, dis protodb.DB_ReverseIteratorServer) error {
|
|
it := s.db.ReverseIterator(query.Start, query.End)
|
|
return s.handleIterator(it, dis.Send)
|
|
}
|
|
|
|
func (s *server) Stats(context.Context, *protodb.Nothing) (*protodb.Stats, error) {
|
|
stats := s.db.Stats()
|
|
return &protodb.Stats{Data: stats, TimeAt: time.Now().Unix()}, nil
|
|
}
|