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303 lines
8.4 KiB
303 lines
8.4 KiB
package tmspcli
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import (
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"fmt"
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"net"
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"sync"
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"time"
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context "golang.org/x/net/context"
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grpc "google.golang.org/grpc"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/tmsp/types"
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)
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// A stripped copy of the remoteClient that makes
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// synchronous calls using grpc
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type grpcClient struct {
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QuitService
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mustConnect bool
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client types.TMSPApplicationClient
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mtx sync.Mutex
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addr string
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err error
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resCb func(*types.Request, *types.Response) // listens to all callbacks
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}
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func NewGRPCClient(addr string, mustConnect bool) (*grpcClient, error) {
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cli := &grpcClient{
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addr: addr,
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mustConnect: mustConnect,
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}
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cli.QuitService = *NewQuitService(nil, "grpcClient", cli)
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_, err := cli.Start() // Just start it, it's confusing for callers to remember to start.
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return cli, err
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}
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func dialerFunc(addr string, timeout time.Duration) (net.Conn, error) {
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return Connect(addr)
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}
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func (cli *grpcClient) OnStart() error {
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cli.QuitService.OnStart()
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RETRY_LOOP:
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for {
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conn, err := grpc.Dial(cli.addr, grpc.WithInsecure(), grpc.WithDialer(dialerFunc))
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if err != nil {
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if cli.mustConnect {
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return err
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} else {
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fmt.Printf("tmsp.grpcClient failed to connect to %v. Retrying...\n", cli.addr)
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time.Sleep(time.Second * 3)
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continue RETRY_LOOP
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}
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}
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cli.client = types.NewTMSPApplicationClient(conn)
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return nil
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}
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}
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func (cli *grpcClient) OnStop() {
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cli.QuitService.OnStop()
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// TODO: how to close when TMSPApplicationClient interface doesn't expose Close ?
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}
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// Set listener for all responses
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// NOTE: callback may get internally generated flush responses.
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func (cli *grpcClient) SetResponseCallback(resCb Callback) {
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cli.mtx.Lock()
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defer cli.mtx.Unlock()
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cli.resCb = resCb
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}
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func (cli *grpcClient) StopForError(err error) {
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cli.mtx.Lock()
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fmt.Printf("Stopping tmsp.grpcClient for error: %v\n", err.Error())
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if cli.err == nil {
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cli.err = err
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}
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cli.mtx.Unlock()
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cli.Stop()
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}
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func (cli *grpcClient) Error() error {
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cli.mtx.Lock()
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defer cli.mtx.Unlock()
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return cli.err
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}
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//----------------------------------------
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// GRPC calls are synchronous, but some callbacks expect to be called asynchronously
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// (eg. the mempool expects to be able to lock to remove bad txs from cache).
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// To accomodate, we finish each call in its own go-routine,
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// which is expensive, but easy - if you want something better, use the socket protocol!
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// maybe one day, if people really want it, we use grpc streams,
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// but hopefully not :D
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func (cli *grpcClient) EchoAsync(msg string) *ReqRes {
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req := types.ToRequestEcho(msg)
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res, err := cli.client.Echo(context.Background(), req.GetEcho())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_Echo{res}})
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}
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func (cli *grpcClient) FlushAsync() *ReqRes {
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req := types.ToRequestFlush()
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res, err := cli.client.Flush(context.Background(), req.GetFlush())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_Flush{res}})
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}
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func (cli *grpcClient) InfoAsync() *ReqRes {
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req := types.ToRequestInfo()
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res, err := cli.client.Info(context.Background(), req.GetInfo())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_Info{res}})
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}
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func (cli *grpcClient) SetOptionAsync(key string, value string) *ReqRes {
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req := types.ToRequestSetOption(key, value)
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res, err := cli.client.SetOption(context.Background(), req.GetSetOption())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_SetOption{res}})
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}
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func (cli *grpcClient) AppendTxAsync(tx []byte) *ReqRes {
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req := types.ToRequestAppendTx(tx)
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res, err := cli.client.AppendTx(context.Background(), req.GetAppendTx())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_AppendTx{res}})
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}
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func (cli *grpcClient) CheckTxAsync(tx []byte) *ReqRes {
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req := types.ToRequestCheckTx(tx)
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res, err := cli.client.CheckTx(context.Background(), req.GetCheckTx())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_CheckTx{res}})
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}
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func (cli *grpcClient) QueryAsync(query []byte) *ReqRes {
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req := types.ToRequestQuery(query)
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res, err := cli.client.Query(context.Background(), req.GetQuery())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_Query{res}})
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}
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func (cli *grpcClient) CommitAsync() *ReqRes {
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req := types.ToRequestCommit()
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res, err := cli.client.Commit(context.Background(), req.GetCommit())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_Commit{res}})
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}
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func (cli *grpcClient) InitChainAsync(validators []*types.Validator) *ReqRes {
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req := types.ToRequestInitChain(validators)
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res, err := cli.client.InitChain(context.Background(), req.GetInitChain())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_InitChain{res}})
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}
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func (cli *grpcClient) BeginBlockAsync(height uint64) *ReqRes {
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req := types.ToRequestBeginBlock(height)
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res, err := cli.client.BeginBlock(context.Background(), req.GetBeginBlock())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_BeginBlock{res}})
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}
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func (cli *grpcClient) EndBlockAsync(height uint64) *ReqRes {
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req := types.ToRequestEndBlock(height)
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res, err := cli.client.EndBlock(context.Background(), req.GetEndBlock())
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if err != nil {
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cli.err = err
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}
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return cli.finishAsyncCall(req, &types.Response{&types.Response_EndBlock{res}})
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}
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func (cli *grpcClient) finishAsyncCall(req *types.Request, res *types.Response) *ReqRes {
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reqres := NewReqRes(req)
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reqres.Response = res // Set response
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reqres.Done() // Release waiters
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reqres.SetDone() // so reqRes.SetCallback will run the callback
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// go routine for callbacks
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go func() {
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// Notify reqRes listener if set
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if cb := reqres.GetCallback(); cb != nil {
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cb(res)
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}
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// Notify client listener if set
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if cli.resCb != nil {
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cli.resCb(reqres.Request, res)
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}
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}()
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return reqres
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}
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//----------------------------------------
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func (cli *grpcClient) EchoSync(msg string) (res types.Result) {
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r := cli.EchoAsync(msg).Response.GetEcho()
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return types.NewResultOK([]byte(r.Message), LOG)
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}
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func (cli *grpcClient) FlushSync() error {
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return nil
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}
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func (cli *grpcClient) InfoSync() (res types.Result) {
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r := cli.InfoAsync().Response.GetInfo()
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return types.NewResultOK([]byte(r.Info), LOG)
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}
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func (cli *grpcClient) SetOptionSync(key string, value string) (res types.Result) {
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reqres := cli.SetOptionAsync(key, value)
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if cli.err != nil {
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return types.ErrInternalError.SetLog(cli.err.Error())
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}
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resp := reqres.Response.GetSetOption()
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return types.Result{Code: OK, Data: nil, Log: resp.Log}
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}
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func (cli *grpcClient) AppendTxSync(tx []byte) (res types.Result) {
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reqres := cli.AppendTxAsync(tx)
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if cli.err != nil {
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return types.ErrInternalError.SetLog(cli.err.Error())
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}
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resp := reqres.Response.GetAppendTx()
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return types.Result{Code: resp.Code, Data: resp.Data, Log: resp.Log}
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}
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func (cli *grpcClient) CheckTxSync(tx []byte) (res types.Result) {
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reqres := cli.CheckTxAsync(tx)
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if cli.err != nil {
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return types.ErrInternalError.SetLog(cli.err.Error())
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}
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resp := reqres.Response.GetCheckTx()
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return types.Result{Code: resp.Code, Data: resp.Data, Log: resp.Log}
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}
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func (cli *grpcClient) QuerySync(query []byte) (res types.Result) {
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reqres := cli.QueryAsync(query)
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if cli.err != nil {
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return types.ErrInternalError.SetLog(cli.err.Error())
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}
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resp := reqres.Response.GetQuery()
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return types.Result{Code: resp.Code, Data: resp.Data, Log: resp.Log}
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}
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func (cli *grpcClient) CommitSync() (res types.Result) {
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reqres := cli.CommitAsync()
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if cli.err != nil {
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return types.ErrInternalError.SetLog(cli.err.Error())
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}
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resp := reqres.Response.GetCommit()
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return types.Result{Code: resp.Code, Data: resp.Data, Log: resp.Log}
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}
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func (cli *grpcClient) InitChainSync(validators []*types.Validator) (err error) {
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cli.InitChainAsync(validators)
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if cli.err != nil {
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return cli.err
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}
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return nil
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}
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func (cli *grpcClient) BeginBlockSync(height uint64) (err error) {
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cli.BeginBlockAsync(height)
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if cli.err != nil {
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return cli.err
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}
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return nil
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}
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func (cli *grpcClient) EndBlockSync(height uint64) (validators []*types.Validator, err error) {
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reqres := cli.EndBlockAsync(height)
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if cli.err != nil {
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return nil, cli.err
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}
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return reqres.Response.GetEndBlock().Diffs, nil
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}
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