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package tmspcli
import (
"net"
"sync"
"time"
context "golang.org/x/net/context"
grpc "google.golang.org/grpc"
. "github.com/tendermint/go-common"
"github.com/tendermint/tmsp/types"
)
// A stripped copy of the remoteClient that makes
// synchronous calls using grpc
type grpcClient struct {
QuitService
mustConnect bool
client types.TMSPApplicationClient
mtx sync.Mutex
addr string
err error
resCb func(*types.Request, *types.Response) // listens to all callbacks
}
func NewGRPCClient(addr string, mustConnect bool) (*grpcClient, error) {
cli := &grpcClient{
addr: addr,
mustConnect: mustConnect,
}
cli.QuitService = *NewQuitService(nil, "grpcClient", cli)
_, err := cli.Start() // Just start it, it's confusing for callers to remember to start.
return cli, err
}
func dialerFunc(addr string, timeout time.Duration) (net.Conn, error) {
return Connect(addr)
}
func (cli *grpcClient) OnStart() error {
cli.QuitService.OnStart()
RETRY_LOOP:
for {
conn, err := grpc.Dial(cli.addr, grpc.WithInsecure(), grpc.WithDialer(dialerFunc))
if err != nil {
if cli.mustConnect {
return err
} else {
log.Warn(Fmt("tmsp.grpcClient failed to connect to %v. Retrying...\n", cli.addr))
time.Sleep(time.Second * 3)
continue RETRY_LOOP
}
}
client := types.NewTMSPApplicationClient(conn)
ENSURE_CONNECTED:
for {
_, err := client.Echo(context.Background(), &types.RequestEcho{"hello"}, grpc.FailFast(true))
if err == nil {
break ENSURE_CONNECTED
}
time.Sleep(time.Second)
}
cli.client = client
return nil
}
}
func (cli *grpcClient) OnStop() {
cli.QuitService.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.conn != nil {
cli.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()
log.Warn(Fmt("Stopping tmsp.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 accomodate, 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{&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{&types.Response_Flush{res}})
}
func (cli *grpcClient) InfoAsync() *ReqRes {
req := types.ToRequestInfo()
res, err := cli.client.Info(context.Background(), req.GetInfo(), grpc.FailFast(true))
if err != nil {
cli.StopForError(err)
}
return cli.finishAsyncCall(req, &types.Response{&types.Response_Info{res}})
}
func (cli *grpcClient) SetOptionAsync(key string, value string) *ReqRes {
req := types.ToRequestSetOption(key, value)
res, err := cli.client.SetOption(context.Background(), req.GetSetOption(), grpc.FailFast(true))
if err != nil {
cli.StopForError(err)
}
return cli.finishAsyncCall(req, &types.Response{&types.Response_SetOption{res}})
}
func (cli *grpcClient) AppendTxAsync(tx []byte) *ReqRes {
req := types.ToRequestAppendTx(tx)
res, err := cli.client.AppendTx(context.Background(), req.GetAppendTx(), grpc.FailFast(true))
if err != nil {
cli.StopForError(err)
}
return cli.finishAsyncCall(req, &types.Response{&types.Response_AppendTx{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{&types.Response_CheckTx{res}})
}
func (cli *grpcClient) QueryAsync(query []byte) *ReqRes {
req := types.ToRequestQuery(query)
res, err := cli.client.Query(context.Background(), req.GetQuery(), grpc.FailFast(true))
if err != nil {
cli.StopForError(err)
}
return cli.finishAsyncCall(req, &types.Response{&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{&types.Response_Commit{res}})
}
func (cli *grpcClient) InitChainAsync(validators []*types.Validator) *ReqRes {
req := types.ToRequestInitChain(validators)
res, err := cli.client.InitChain(context.Background(), req.GetInitChain(), grpc.FailFast(true))
if err != nil {
cli.StopForError(err)
}
return cli.finishAsyncCall(req, &types.Response{&types.Response_InitChain{res}})
}
func (cli *grpcClient) BeginBlockAsync(height uint64) *ReqRes {
req := types.ToRequestBeginBlock(height)
res, err := cli.client.BeginBlock(context.Background(), req.GetBeginBlock(), grpc.FailFast(true))
if err != nil {
cli.StopForError(err)
}
return cli.finishAsyncCall(req, &types.Response{&types.Response_BeginBlock{res}})
}
func (cli *grpcClient) EndBlockAsync(height uint64) *ReqRes {
req := types.ToRequestEndBlock(height)
res, err := cli.client.EndBlock(context.Background(), req.GetEndBlock(), grpc.FailFast(true))
if err != nil {
cli.StopForError(err)
}
return cli.finishAsyncCall(req, &types.Response{&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) checkErrGetResult() types.Result {
if err := cli.Error(); err != nil {
// StopForError should already have been called if error is set
return types.ErrInternalError.SetLog(err.Error())
}
return types.Result{}
}
//----------------------------------------
func (cli *grpcClient) EchoSync(msg string) (res types.Result) {
reqres := cli.EchoAsync(msg)
if res := cli.checkErrGetResult(); res.IsErr() {
return res
}
resp := reqres.Response.GetEcho()
return types.NewResultOK([]byte(resp.Message), LOG)
}
func (cli *grpcClient) FlushSync() error {
return nil
}
func (cli *grpcClient) InfoSync() (res types.Result) {
reqres := cli.InfoAsync()
if res := cli.checkErrGetResult(); res.IsErr() {
return res
}
resp := reqres.Response.GetInfo()
return types.NewResultOK([]byte(resp.Info), LOG)
}
func (cli *grpcClient) SetOptionSync(key string, value string) (res types.Result) {
reqres := cli.SetOptionAsync(key, value)
if res := cli.checkErrGetResult(); res.IsErr() {
return res
}
resp := reqres.Response.GetSetOption()
return types.Result{Code: OK, Data: nil, Log: resp.Log}
}
func (cli *grpcClient) AppendTxSync(tx []byte) (res types.Result) {
reqres := cli.AppendTxAsync(tx)
if res := cli.checkErrGetResult(); res.IsErr() {
return res
}
resp := reqres.Response.GetAppendTx()
return types.Result{Code: resp.Code, Data: resp.Data, Log: resp.Log}
}
func (cli *grpcClient) CheckTxSync(tx []byte) (res types.Result) {
reqres := cli.CheckTxAsync(tx)
if res := cli.checkErrGetResult(); res.IsErr() {
return res
}
resp := reqres.Response.GetCheckTx()
return types.Result{Code: resp.Code, Data: resp.Data, Log: resp.Log}
}
func (cli *grpcClient) QuerySync(query []byte) (res types.Result) {
reqres := cli.QueryAsync(query)
if res := cli.checkErrGetResult(); res.IsErr() {
return res
}
resp := reqres.Response.GetQuery()
return types.Result{Code: resp.Code, Data: resp.Data, Log: resp.Log}
}
func (cli *grpcClient) CommitSync() (res types.Result) {
reqres := cli.CommitAsync()
if res := cli.checkErrGetResult(); res.IsErr() {
return res
}
resp := reqres.Response.GetCommit()
return types.Result{Code: resp.Code, Data: resp.Data, Log: resp.Log}
}
func (cli *grpcClient) InitChainSync(validators []*types.Validator) (err error) {
cli.InitChainAsync(validators)
return cli.Error()
}
func (cli *grpcClient) BeginBlockSync(height uint64) (err error) {
cli.BeginBlockAsync(height)
return cli.Error()
}
func (cli *grpcClient) EndBlockSync(height uint64) (validators []*types.Validator, err error) {
reqres := cli.EndBlockAsync(height)
if err := cli.Error(); err != nil {
return nil, err
}
return reqres.Response.GetEndBlock().Diffs, nil
}