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405 lines
14 KiB
405 lines
14 KiB
package abcicli
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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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"golang.org/x/net/context"
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"google.golang.org/grpc"
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"github.com/tendermint/tendermint/abci/types"
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tmnet "github.com/tendermint/tendermint/libs/net"
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"github.com/tendermint/tendermint/libs/service"
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tmsync "github.com/tendermint/tendermint/libs/sync"
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)
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var _ Client = (*grpcClient)(nil)
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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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service.BaseService
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mustConnect bool
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client types.ABCIApplicationClient
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conn *grpc.ClientConn
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chReqRes chan *ReqRes // dispatches "async" responses to callbacks *in order*, needed by mempool
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mtx tmsync.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) Client {
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cli := &grpcClient{
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addr: addr,
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mustConnect: mustConnect,
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// Buffering the channel is needed to make calls appear asynchronous,
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// which is required when the caller makes multiple async calls before
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// processing callbacks (e.g. due to holding locks). 64 means that a
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// caller can make up to 64 async calls before a callback must be
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// processed (otherwise it deadlocks). It also means that we can make 64
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// gRPC calls while processing a slow callback at the channel head.
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chReqRes: make(chan *ReqRes, 64),
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}
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cli.BaseService = *service.NewBaseService(nil, "grpcClient", cli)
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return cli
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}
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func dialerFunc(ctx context.Context, addr string) (net.Conn, error) {
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return tmnet.Connect(addr)
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}
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func (cli *grpcClient) OnStart() error {
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if err := cli.BaseService.OnStart(); err != nil {
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return err
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}
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// This processes asynchronous request/response messages and dispatches
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// them to callbacks.
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go func() {
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// Use a separate function to use defer for mutex unlocks (this handles panics)
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callCb := func(reqres *ReqRes) {
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cli.mtx.Lock()
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defer cli.mtx.Unlock()
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reqres.SetDone()
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reqres.Done()
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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, reqres.Response)
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}
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// Notify reqRes listener if set
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if cb := reqres.GetCallback(); cb != nil {
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cb(reqres.Response)
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}
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}
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for reqres := range cli.chReqRes {
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if reqres != nil {
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callCb(reqres)
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} else {
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cli.Logger.Error("Received nil reqres")
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}
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}
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}()
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RETRY_LOOP:
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for {
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conn, err := grpc.Dial(cli.addr, grpc.WithInsecure(), grpc.WithContextDialer(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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}
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cli.Logger.Error(fmt.Sprintf("abci.grpcClient failed to connect to %v. Retrying...\n", cli.addr), "err", err)
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time.Sleep(time.Second * dialRetryIntervalSeconds)
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continue RETRY_LOOP
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}
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cli.Logger.Info("Dialed server. Waiting for echo.", "addr", cli.addr)
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client := types.NewABCIApplicationClient(conn)
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cli.conn = conn
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ENSURE_CONNECTED:
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for {
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_, err := client.Echo(context.Background(), &types.RequestEcho{Message: "hello"}, grpc.WaitForReady(true))
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if err == nil {
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break ENSURE_CONNECTED
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}
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cli.Logger.Error("Echo failed", "err", err)
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time.Sleep(time.Second * echoRetryIntervalSeconds)
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}
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cli.client = client
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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.BaseService.OnStop()
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if cli.conn != nil {
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cli.conn.Close()
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}
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close(cli.chReqRes)
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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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if !cli.IsRunning() {
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return
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}
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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.Logger.Error(fmt.Sprintf("Stopping abci.grpcClient for error: %v", err.Error()))
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if err := cli.Stop(); err != nil {
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cli.Logger.Error("Error stopping abci.grpcClient", "err", err)
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}
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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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// 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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cli.resCb = resCb
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cli.mtx.Unlock()
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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 accommodate, 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(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Echo{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(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Flush{Flush: res}})
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}
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func (cli *grpcClient) InfoAsync(params types.RequestInfo) *ReqRes {
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req := types.ToRequestInfo(params)
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res, err := cli.client.Info(context.Background(), req.GetInfo(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Info{Info: res}})
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}
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func (cli *grpcClient) DeliverTxAsync(params types.RequestDeliverTx) *ReqRes {
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req := types.ToRequestDeliverTx(params)
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res, err := cli.client.DeliverTx(context.Background(), req.GetDeliverTx(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_DeliverTx{DeliverTx: res}})
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}
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func (cli *grpcClient) CheckTxAsync(params types.RequestCheckTx) *ReqRes {
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req := types.ToRequestCheckTx(params)
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res, err := cli.client.CheckTx(context.Background(), req.GetCheckTx(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_CheckTx{CheckTx: res}})
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}
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func (cli *grpcClient) QueryAsync(params types.RequestQuery) *ReqRes {
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req := types.ToRequestQuery(params)
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res, err := cli.client.Query(context.Background(), req.GetQuery(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Query{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(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_Commit{Commit: res}})
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}
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func (cli *grpcClient) InitChainAsync(params types.RequestInitChain) *ReqRes {
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req := types.ToRequestInitChain(params)
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res, err := cli.client.InitChain(context.Background(), req.GetInitChain(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_InitChain{InitChain: res}})
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}
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func (cli *grpcClient) BeginBlockAsync(params types.RequestBeginBlock) *ReqRes {
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req := types.ToRequestBeginBlock(params)
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res, err := cli.client.BeginBlock(context.Background(), req.GetBeginBlock(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_BeginBlock{BeginBlock: res}})
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}
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func (cli *grpcClient) EndBlockAsync(params types.RequestEndBlock) *ReqRes {
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req := types.ToRequestEndBlock(params)
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res, err := cli.client.EndBlock(context.Background(), req.GetEndBlock(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_EndBlock{EndBlock: res}})
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}
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func (cli *grpcClient) ListSnapshotsAsync(params types.RequestListSnapshots) *ReqRes {
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req := types.ToRequestListSnapshots(params)
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res, err := cli.client.ListSnapshots(context.Background(), req.GetListSnapshots(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_ListSnapshots{ListSnapshots: res}})
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}
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func (cli *grpcClient) OfferSnapshotAsync(params types.RequestOfferSnapshot) *ReqRes {
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req := types.ToRequestOfferSnapshot(params)
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res, err := cli.client.OfferSnapshot(context.Background(), req.GetOfferSnapshot(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_OfferSnapshot{OfferSnapshot: res}})
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}
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func (cli *grpcClient) LoadSnapshotChunkAsync(params types.RequestLoadSnapshotChunk) *ReqRes {
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req := types.ToRequestLoadSnapshotChunk(params)
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res, err := cli.client.LoadSnapshotChunk(context.Background(), req.GetLoadSnapshotChunk(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_LoadSnapshotChunk{LoadSnapshotChunk: res}})
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}
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func (cli *grpcClient) ApplySnapshotChunkAsync(params types.RequestApplySnapshotChunk) *ReqRes {
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req := types.ToRequestApplySnapshotChunk(params)
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res, err := cli.client.ApplySnapshotChunk(context.Background(), req.GetApplySnapshotChunk(), grpc.WaitForReady(true))
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if err != nil {
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cli.StopForError(err)
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}
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return cli.finishAsyncCall(req, &types.Response{Value: &types.Response_ApplySnapshotChunk{ApplySnapshotChunk: res}})
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}
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// finishAsyncCall creates a ReqRes for an async call, and immediately populates it
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// with the response. We don't complete it until it's been ordered via the channel.
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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
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cli.chReqRes <- reqres // use channel for async responses, since they must be ordered
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return reqres
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}
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// finishSyncCall waits for an async call to complete. It is necessary to call all
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// sync calls asynchronously as well, to maintain call and response ordering via
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// the channel, and this method will wait until the async call completes.
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func (cli *grpcClient) finishSyncCall(reqres *ReqRes) *types.Response {
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// It's possible that the callback is called twice, since the callback can
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// be called immediately on SetCallback() in addition to after it has been
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// set. This is because completing the ReqRes happens in a separate critical
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// section from the one where the callback is called: there is a race where
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// SetCallback() is called between completing the ReqRes and dispatching the
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// callback.
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//
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// We also buffer the channel with 1 response, since SetCallback() will be
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// called synchronously if the reqres is already completed, in which case
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// it will block on sending to the channel since it hasn't gotten around to
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// receiving from it yet.
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//
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// ReqRes should really handle callback dispatch internally, to guarantee
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// that it's only called once and avoid the above race conditions.
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var once sync.Once
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ch := make(chan *types.Response, 1)
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reqres.SetCallback(func(res *types.Response) {
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once.Do(func() {
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ch <- res
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})
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})
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return <-ch
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}
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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) EchoSync(msg string) (*types.ResponseEcho, error) {
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reqres := cli.EchoAsync(msg)
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// StopForError should already have been called if error is set
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return cli.finishSyncCall(reqres).GetEcho(), cli.Error()
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}
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func (cli *grpcClient) InfoSync(req types.RequestInfo) (*types.ResponseInfo, error) {
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reqres := cli.InfoAsync(req)
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return cli.finishSyncCall(reqres).GetInfo(), cli.Error()
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}
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func (cli *grpcClient) DeliverTxSync(params types.RequestDeliverTx) (*types.ResponseDeliverTx, error) {
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reqres := cli.DeliverTxAsync(params)
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return cli.finishSyncCall(reqres).GetDeliverTx(), cli.Error()
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}
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func (cli *grpcClient) CheckTxSync(params types.RequestCheckTx) (*types.ResponseCheckTx, error) {
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reqres := cli.CheckTxAsync(params)
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return cli.finishSyncCall(reqres).GetCheckTx(), cli.Error()
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}
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func (cli *grpcClient) QuerySync(req types.RequestQuery) (*types.ResponseQuery, error) {
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reqres := cli.QueryAsync(req)
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return cli.finishSyncCall(reqres).GetQuery(), cli.Error()
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}
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func (cli *grpcClient) CommitSync() (*types.ResponseCommit, error) {
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reqres := cli.CommitAsync()
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return cli.finishSyncCall(reqres).GetCommit(), cli.Error()
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}
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func (cli *grpcClient) InitChainSync(params types.RequestInitChain) (*types.ResponseInitChain, error) {
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reqres := cli.InitChainAsync(params)
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return cli.finishSyncCall(reqres).GetInitChain(), cli.Error()
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}
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func (cli *grpcClient) BeginBlockSync(params types.RequestBeginBlock) (*types.ResponseBeginBlock, error) {
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reqres := cli.BeginBlockAsync(params)
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return cli.finishSyncCall(reqres).GetBeginBlock(), cli.Error()
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}
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func (cli *grpcClient) EndBlockSync(params types.RequestEndBlock) (*types.ResponseEndBlock, error) {
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reqres := cli.EndBlockAsync(params)
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return cli.finishSyncCall(reqres).GetEndBlock(), cli.Error()
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}
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func (cli *grpcClient) ListSnapshotsSync(params types.RequestListSnapshots) (*types.ResponseListSnapshots, error) {
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reqres := cli.ListSnapshotsAsync(params)
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return cli.finishSyncCall(reqres).GetListSnapshots(), cli.Error()
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}
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func (cli *grpcClient) OfferSnapshotSync(params types.RequestOfferSnapshot) (*types.ResponseOfferSnapshot, error) {
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reqres := cli.OfferSnapshotAsync(params)
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return cli.finishSyncCall(reqres).GetOfferSnapshot(), cli.Error()
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}
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func (cli *grpcClient) LoadSnapshotChunkSync(
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params types.RequestLoadSnapshotChunk) (*types.ResponseLoadSnapshotChunk, error) {
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reqres := cli.LoadSnapshotChunkAsync(params)
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return cli.finishSyncCall(reqres).GetLoadSnapshotChunk(), cli.Error()
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}
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func (cli *grpcClient) ApplySnapshotChunkSync(
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params types.RequestApplySnapshotChunk) (*types.ResponseApplySnapshotChunk, error) {
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reqres := cli.ApplySnapshotChunkAsync(params)
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return cli.finishSyncCall(reqres).GetApplySnapshotChunk(), cli.Error()
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}
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