package abcicli import ( "fmt" "net" "sync" "time" context "golang.org/x/net/context" grpc "google.golang.org/grpc" "github.com/tendermint/tendermint/abci/types" cmn "github.com/tendermint/tendermint/libs/common" ) var _ Client = (*grpcClient)(nil) // A stripped copy of the remoteClient that makes // synchronous calls using grpc type grpcClient struct { cmn.BaseService mustConnect bool client types.ABCIApplicationClient mtx sync.Mutex addr string err error resCb func(*types.Request, *types.Response) // listens to all callbacks } func NewGRPCClient(addr string, mustConnect bool) *grpcClient { cli := &grpcClient{ addr: addr, mustConnect: mustConnect, } cli.BaseService = *cmn.NewBaseService(nil, "grpcClient", cli) return cli } func dialerFunc(addr string, timeout time.Duration) (net.Conn, error) { return cmn.Connect(addr) } func (cli *grpcClient) OnStart() error { if err := cli.BaseService.OnStart(); err != nil { return err } RETRY_LOOP: for { conn, err := grpc.Dial(cli.addr, grpc.WithInsecure(), grpc.WithDialer(dialerFunc)) if err != nil { if cli.mustConnect { return err } cli.Logger.Error(fmt.Sprintf("abci.grpcClient failed to connect to %v. Retrying...\n", cli.addr)) time.Sleep(time.Second * dialRetryIntervalSeconds) continue RETRY_LOOP } cli.Logger.Info("Dialed server. Waiting for echo.", "addr", cli.addr) client := types.NewABCIApplicationClient(conn) ENSURE_CONNECTED: for { _, err := client.Echo(context.Background(), &types.RequestEcho{Message: "hello"}, grpc.FailFast(true)) if err == nil { break ENSURE_CONNECTED } cli.Logger.Error("Echo failed", "err", err) time.Sleep(time.Second * echoRetryIntervalSeconds) } cli.client = client return nil } } func (cli *grpcClient) OnStop() { cli.BaseService.OnStop() cli.mtx.Lock() defer cli.mtx.Unlock() // TODO: how to close conn? its not a net.Conn and grpc doesn't expose a Close() /*if cli.client.conn != nil { cli.client.conn.Close() }*/ } func (cli *grpcClient) StopForError(err error) { cli.mtx.Lock() if !cli.IsRunning() { return } if cli.err == nil { cli.err = err } cli.mtx.Unlock() cli.Logger.Error(fmt.Sprintf("Stopping abci.grpcClient for error: %v", err.Error())) cli.Stop() } func (cli *grpcClient) Error() error { cli.mtx.Lock() defer cli.mtx.Unlock() return cli.err } // Set listener for all responses // NOTE: callback may get internally generated flush responses. func (cli *grpcClient) SetResponseCallback(resCb Callback) { cli.mtx.Lock() defer cli.mtx.Unlock() cli.resCb = resCb } //---------------------------------------- // GRPC calls are synchronous, but some callbacks expect to be called asynchronously // (eg. the mempool expects to be able to lock to remove bad txs from cache). // To accommodate, we finish each call in its own go-routine, // which is expensive, but easy - if you want something better, use the socket protocol! // maybe one day, if people really want it, we use grpc streams, // but hopefully not :D func (cli *grpcClient) EchoAsync(msg string) *ReqRes { req := types.ToRequestEcho(msg) res, err := cli.client.Echo(context.Background(), req.GetEcho(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Echo{res}}) } func (cli *grpcClient) FlushAsync() *ReqRes { req := types.ToRequestFlush() res, err := cli.client.Flush(context.Background(), req.GetFlush(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Flush{res}}) } func (cli *grpcClient) InfoAsync(params types.RequestInfo) *ReqRes { req := types.ToRequestInfo(params) res, err := cli.client.Info(context.Background(), req.GetInfo(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Info{res}}) } func (cli *grpcClient) SetOptionAsync(params types.RequestSetOption) *ReqRes { req := types.ToRequestSetOption(params) res, err := cli.client.SetOption(context.Background(), req.GetSetOption(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_SetOption{res}}) } func (cli *grpcClient) DeliverTxAsync(tx []byte) *ReqRes { req := types.ToRequestDeliverTx(tx) res, err := cli.client.DeliverTx(context.Background(), req.GetDeliverTx(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_DeliverTx{res}}) } func (cli *grpcClient) CheckTxAsync(tx []byte) *ReqRes { req := types.ToRequestCheckTx(tx) res, err := cli.client.CheckTx(context.Background(), req.GetCheckTx(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_CheckTx{res}}) } func (cli *grpcClient) QueryAsync(params types.RequestQuery) *ReqRes { req := types.ToRequestQuery(params) res, err := cli.client.Query(context.Background(), req.GetQuery(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Query{res}}) } func (cli *grpcClient) CommitAsync() *ReqRes { req := types.ToRequestCommit() res, err := cli.client.Commit(context.Background(), req.GetCommit(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Commit{res}}) } func (cli *grpcClient) InitChainAsync(params types.RequestInitChain) *ReqRes { req := types.ToRequestInitChain(params) res, err := cli.client.InitChain(context.Background(), req.GetInitChain(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_InitChain{res}}) } func (cli *grpcClient) BeginBlockAsync(params types.RequestBeginBlock) *ReqRes { req := types.ToRequestBeginBlock(params) res, err := cli.client.BeginBlock(context.Background(), req.GetBeginBlock(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_BeginBlock{res}}) } func (cli *grpcClient) EndBlockAsync(params types.RequestEndBlock) *ReqRes { req := types.ToRequestEndBlock(params) res, err := cli.client.EndBlock(context.Background(), req.GetEndBlock(), grpc.FailFast(true)) if err != nil { cli.StopForError(err) } return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_EndBlock{res}}) } func (cli *grpcClient) finishAsyncCall(req *types.Request, res *types.Response) *ReqRes { reqres := NewReqRes(req) reqres.Response = res // Set response reqres.Done() // Release waiters reqres.SetDone() // so reqRes.SetCallback will run the callback // go routine for callbacks go func() { // Notify reqRes listener if set if cb := reqres.GetCallback(); cb != nil { cb(res) } // Notify client listener if set if cli.resCb != nil { cli.resCb(reqres.Request, res) } }() return reqres } //---------------------------------------- func (cli *grpcClient) FlushSync() error { return nil } func (cli *grpcClient) EchoSync(msg string) (*types.ResponseEcho, error) { reqres := cli.EchoAsync(msg) // StopForError should already have been called if error is set return reqres.Response.GetEcho(), cli.Error() } func (cli *grpcClient) InfoSync(req types.RequestInfo) (*types.ResponseInfo, error) { reqres := cli.InfoAsync(req) return reqres.Response.GetInfo(), cli.Error() } func (cli *grpcClient) SetOptionSync(req types.RequestSetOption) (*types.ResponseSetOption, error) { reqres := cli.SetOptionAsync(req) return reqres.Response.GetSetOption(), cli.Error() } func (cli *grpcClient) DeliverTxSync(tx []byte) (*types.ResponseDeliverTx, error) { reqres := cli.DeliverTxAsync(tx) return reqres.Response.GetDeliverTx(), cli.Error() } func (cli *grpcClient) CheckTxSync(tx []byte) (*types.ResponseCheckTx, error) { reqres := cli.CheckTxAsync(tx) return reqres.Response.GetCheckTx(), cli.Error() } func (cli *grpcClient) QuerySync(req types.RequestQuery) (*types.ResponseQuery, error) { reqres := cli.QueryAsync(req) return reqres.Response.GetQuery(), cli.Error() } func (cli *grpcClient) CommitSync() (*types.ResponseCommit, error) { reqres := cli.CommitAsync() return reqres.Response.GetCommit(), cli.Error() } func (cli *grpcClient) InitChainSync(params types.RequestInitChain) (*types.ResponseInitChain, error) { reqres := cli.InitChainAsync(params) return reqres.Response.GetInitChain(), cli.Error() } func (cli *grpcClient) BeginBlockSync(params types.RequestBeginBlock) (*types.ResponseBeginBlock, error) { reqres := cli.BeginBlockAsync(params) return reqres.Response.GetBeginBlock(), cli.Error() } func (cli *grpcClient) EndBlockSync(params types.RequestEndBlock) (*types.ResponseEndBlock, error) { reqres := cli.EndBlockAsync(params) return reqres.Response.GetEndBlock(), cli.Error() }