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server.go
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server.go
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package grpcdb
import (
"context"
"net"
"sync"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"github.com/tendermint/tendermint/libs/db"
protodb "github.com/tendermint/tendermint/libs/db/remotedb/proto"
)
// ListenAndServe 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 ListenAndServe(addr, cert, key string, opts ...grpc.ServerOption) error {
ln, err := net.Listen("tcp", addr)
if err != nil {
return err
}
srv, err := NewServer(cert, key, opts...)
if err != nil {
return err
}
return srv.Serve(ln)
}
func NewServer(cert, key string, opts ...grpc.ServerOption) (*grpc.Server, error) {
creds, err := credentials.NewServerTLSFromFile(cert, key)
if err != nil {
return nil, err
}
opts = append(opts, grpc.Creds(creds))
srv := grpc.NewServer(opts...)
protodb.RegisterDBServer(srv, new(server))
return srv, nil
}
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/tendermint/libs/db#DBBackendType
func (s *server) Init(ctx context.Context, in *protodb.Init) (*protodb.Entity, error) {
s.mu.Lock()
defer s.mu.Unlock()
s.db = db.NewDB(in.Name, db.DBBackendType(in.Type), in.Dir)
return &protodb.Entity{CreatedAt: 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.Domain{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
}
func (s *server) BatchWrite(c context.Context, b *protodb.Batch) (*protodb.Nothing, error) {
return s.batchWrite(c, b, false)
}
func (s *server) BatchWriteSync(c context.Context, b *protodb.Batch) (*protodb.Nothing, error) {
return s.batchWrite(c, b, true)
}
func (s *server) batchWrite(c context.Context, b *protodb.Batch, sync bool) (*protodb.Nothing, error) {
bat := s.db.NewBatch()
for _, op := range b.Ops {
switch op.Type {
case protodb.Operation_SET:
bat.Set(op.Entity.Key, op.Entity.Value)
case protodb.Operation_DELETE:
bat.Delete(op.Entity.Key)
}
}
if sync {
bat.WriteSync()
} else {
bat.Write()
}
return nothing, nil
}