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501 lines
14 KiB
501 lines
14 KiB
package abcicli
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import (
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"bufio"
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"container/list"
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"errors"
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"fmt"
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"io"
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"net"
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"reflect"
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"time"
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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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"github.com/tendermint/tendermint/libs/timer"
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)
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const (
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reqQueueSize = 256 // TODO make configurable
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flushThrottleMS = 20 // Don't wait longer than...
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)
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// This is goroutine-safe, but users should beware that the application in
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// general is not meant to be interfaced with concurrent callers.
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type socketClient struct {
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service.BaseService
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addr string
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mustConnect bool
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conn net.Conn
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reqQueue chan *ReqRes
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flushTimer *timer.ThrottleTimer
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mtx tmsync.Mutex
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err error
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reqSent *list.List // list of requests sent, waiting for response
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resCb func(*types.Request, *types.Response) // called on all requests, if set.
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}
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var _ Client = (*socketClient)(nil)
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// NewSocketClient creates a new socket client, which connects to a given
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// address. If mustConnect is true, the client will return an error upon start
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// if it fails to connect.
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func NewSocketClient(addr string, mustConnect bool) Client {
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cli := &socketClient{
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reqQueue: make(chan *ReqRes, reqQueueSize),
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flushTimer: timer.NewThrottleTimer("socketClient", flushThrottleMS),
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mustConnect: mustConnect,
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addr: addr,
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reqSent: list.New(),
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resCb: nil,
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}
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cli.BaseService = *service.NewBaseService(nil, "socketClient", cli)
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return cli
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}
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// OnStart implements Service by connecting to the server and spawning reading
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// and writing goroutines.
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func (cli *socketClient) OnStart() error {
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var (
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err error
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conn net.Conn
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)
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for {
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conn, err = tmnet.Connect(cli.addr)
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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.socketClient failed to connect to %v. Retrying after %vs...",
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cli.addr, dialRetryIntervalSeconds), "err", err)
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time.Sleep(time.Second * dialRetryIntervalSeconds)
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continue
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}
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cli.conn = conn
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go cli.sendRequestsRoutine(conn)
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go cli.recvResponseRoutine(conn)
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return nil
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}
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}
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// OnStop implements Service by closing connection and flushing all queues.
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func (cli *socketClient) OnStop() {
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if cli.conn != nil {
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cli.conn.Close()
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}
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cli.flushQueue()
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cli.flushTimer.Stop()
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}
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// Error returns an error if the client was stopped abruptly.
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func (cli *socketClient) 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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// SetResponseCallback sets a callback, which will be executed for each
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// non-error & non-empty response from the server.
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//
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// NOTE: callback may get internally generated flush responses.
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func (cli *socketClient) 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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func (cli *socketClient) sendRequestsRoutine(conn io.Writer) {
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w := bufio.NewWriter(conn)
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for {
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select {
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case reqres := <-cli.reqQueue:
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// cli.Logger.Debug("Sent request", "requestType", reflect.TypeOf(reqres.Request), "request", reqres.Request)
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cli.willSendReq(reqres)
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err := types.WriteMessage(reqres.Request, w)
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if err != nil {
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cli.stopForError(fmt.Errorf("write to buffer: %w", err))
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return
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}
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// If it's a flush request, flush the current buffer.
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if _, ok := reqres.Request.Value.(*types.Request_Flush); ok {
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err = w.Flush()
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if err != nil {
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cli.stopForError(fmt.Errorf("flush buffer: %w", err))
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return
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}
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}
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case <-cli.flushTimer.Ch: // flush queue
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select {
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case cli.reqQueue <- NewReqRes(types.ToRequestFlush()):
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default:
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// Probably will fill the buffer, or retry later.
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}
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case <-cli.Quit():
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return
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}
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}
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}
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func (cli *socketClient) recvResponseRoutine(conn io.Reader) {
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r := bufio.NewReader(conn)
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for {
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var res = &types.Response{}
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err := types.ReadMessage(r, res)
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if err != nil {
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cli.stopForError(fmt.Errorf("read message: %w", err))
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return
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}
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// cli.Logger.Debug("Received response", "responseType", reflect.TypeOf(res), "response", res)
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switch r := res.Value.(type) {
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case *types.Response_Exception: // app responded with error
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// XXX After setting cli.err, release waiters (e.g. reqres.Done())
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cli.stopForError(errors.New(r.Exception.Error))
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return
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default:
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err := cli.didRecvResponse(res)
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if err != nil {
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cli.stopForError(err)
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return
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}
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}
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}
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}
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func (cli *socketClient) willSendReq(reqres *ReqRes) {
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cli.mtx.Lock()
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defer cli.mtx.Unlock()
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cli.reqSent.PushBack(reqres)
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}
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func (cli *socketClient) didRecvResponse(res *types.Response) error {
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cli.mtx.Lock()
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defer cli.mtx.Unlock()
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// Get the first ReqRes.
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next := cli.reqSent.Front()
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if next == nil {
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return fmt.Errorf("unexpected %v when nothing expected", reflect.TypeOf(res.Value))
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}
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reqres := next.Value.(*ReqRes)
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if !resMatchesReq(reqres.Request, res) {
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return fmt.Errorf("unexpected %v when response to %v expected",
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reflect.TypeOf(res.Value), reflect.TypeOf(reqres.Request.Value))
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}
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reqres.Response = res
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reqres.Done() // release waiters
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cli.reqSent.Remove(next) // pop first item from linked list
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// Notify client listener if set (global callback).
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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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// Notify reqRes listener if set (request specific callback).
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//
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// NOTE: It is possible this callback isn't set on the reqres object. At this
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// point, in which case it will be called after, when it is 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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return nil
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}
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//----------------------------------------
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func (cli *socketClient) EchoAsync(msg string) *ReqRes {
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return cli.queueRequest(types.ToRequestEcho(msg))
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}
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func (cli *socketClient) FlushAsync() *ReqRes {
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return cli.queueRequest(types.ToRequestFlush())
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}
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func (cli *socketClient) InfoAsync(req types.RequestInfo) *ReqRes {
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return cli.queueRequest(types.ToRequestInfo(req))
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}
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func (cli *socketClient) DeliverTxAsync(req types.RequestDeliverTx) *ReqRes {
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return cli.queueRequest(types.ToRequestDeliverTx(req))
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}
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func (cli *socketClient) CheckTxAsync(req types.RequestCheckTx) *ReqRes {
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return cli.queueRequest(types.ToRequestCheckTx(req))
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}
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func (cli *socketClient) QueryAsync(req types.RequestQuery) *ReqRes {
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return cli.queueRequest(types.ToRequestQuery(req))
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}
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func (cli *socketClient) CommitAsync() *ReqRes {
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return cli.queueRequest(types.ToRequestCommit())
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}
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func (cli *socketClient) InitChainAsync(req types.RequestInitChain) *ReqRes {
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return cli.queueRequest(types.ToRequestInitChain(req))
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}
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func (cli *socketClient) BeginBlockAsync(req types.RequestBeginBlock) *ReqRes {
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return cli.queueRequest(types.ToRequestBeginBlock(req))
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}
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func (cli *socketClient) EndBlockAsync(req types.RequestEndBlock) *ReqRes {
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return cli.queueRequest(types.ToRequestEndBlock(req))
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}
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func (cli *socketClient) ListSnapshotsAsync(req types.RequestListSnapshots) *ReqRes {
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return cli.queueRequest(types.ToRequestListSnapshots(req))
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}
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func (cli *socketClient) OfferSnapshotAsync(req types.RequestOfferSnapshot) *ReqRes {
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return cli.queueRequest(types.ToRequestOfferSnapshot(req))
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}
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func (cli *socketClient) LoadSnapshotChunkAsync(req types.RequestLoadSnapshotChunk) *ReqRes {
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return cli.queueRequest(types.ToRequestLoadSnapshotChunk(req))
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}
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func (cli *socketClient) ApplySnapshotChunkAsync(req types.RequestApplySnapshotChunk) *ReqRes {
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return cli.queueRequest(types.ToRequestApplySnapshotChunk(req))
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}
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//----------------------------------------
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func (cli *socketClient) FlushSync() error {
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reqRes := cli.queueRequest(types.ToRequestFlush())
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if err := cli.Error(); err != nil {
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return err
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}
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reqRes.Wait() // NOTE: if we don't flush the queue, its possible to get stuck here
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return cli.Error()
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}
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func (cli *socketClient) EchoSync(msg string) (*types.ResponseEcho, error) {
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reqres := cli.queueRequest(types.ToRequestEcho(msg))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetEcho(), cli.Error()
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}
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func (cli *socketClient) InfoSync(req types.RequestInfo) (*types.ResponseInfo, error) {
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reqres := cli.queueRequest(types.ToRequestInfo(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetInfo(), cli.Error()
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}
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func (cli *socketClient) DeliverTxSync(req types.RequestDeliverTx) (*types.ResponseDeliverTx, error) {
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reqres := cli.queueRequest(types.ToRequestDeliverTx(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetDeliverTx(), cli.Error()
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}
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func (cli *socketClient) CheckTxSync(req types.RequestCheckTx) (*types.ResponseCheckTx, error) {
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reqres := cli.queueRequest(types.ToRequestCheckTx(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetCheckTx(), cli.Error()
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}
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func (cli *socketClient) QuerySync(req types.RequestQuery) (*types.ResponseQuery, error) {
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reqres := cli.queueRequest(types.ToRequestQuery(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetQuery(), cli.Error()
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}
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func (cli *socketClient) CommitSync() (*types.ResponseCommit, error) {
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reqres := cli.queueRequest(types.ToRequestCommit())
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetCommit(), cli.Error()
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}
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func (cli *socketClient) InitChainSync(req types.RequestInitChain) (*types.ResponseInitChain, error) {
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reqres := cli.queueRequest(types.ToRequestInitChain(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetInitChain(), cli.Error()
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}
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func (cli *socketClient) BeginBlockSync(req types.RequestBeginBlock) (*types.ResponseBeginBlock, error) {
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reqres := cli.queueRequest(types.ToRequestBeginBlock(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetBeginBlock(), cli.Error()
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}
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func (cli *socketClient) EndBlockSync(req types.RequestEndBlock) (*types.ResponseEndBlock, error) {
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reqres := cli.queueRequest(types.ToRequestEndBlock(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetEndBlock(), cli.Error()
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}
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func (cli *socketClient) ListSnapshotsSync(req types.RequestListSnapshots) (*types.ResponseListSnapshots, error) {
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reqres := cli.queueRequest(types.ToRequestListSnapshots(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetListSnapshots(), cli.Error()
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}
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func (cli *socketClient) OfferSnapshotSync(req types.RequestOfferSnapshot) (*types.ResponseOfferSnapshot, error) {
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reqres := cli.queueRequest(types.ToRequestOfferSnapshot(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetOfferSnapshot(), cli.Error()
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}
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func (cli *socketClient) LoadSnapshotChunkSync(
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req types.RequestLoadSnapshotChunk) (*types.ResponseLoadSnapshotChunk, error) {
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reqres := cli.queueRequest(types.ToRequestLoadSnapshotChunk(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetLoadSnapshotChunk(), cli.Error()
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}
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func (cli *socketClient) ApplySnapshotChunkSync(
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req types.RequestApplySnapshotChunk) (*types.ResponseApplySnapshotChunk, error) {
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reqres := cli.queueRequest(types.ToRequestApplySnapshotChunk(req))
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if err := cli.FlushSync(); err != nil {
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return nil, err
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}
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return reqres.Response.GetApplySnapshotChunk(), cli.Error()
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}
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//----------------------------------------
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func (cli *socketClient) queueRequest(req *types.Request) *ReqRes {
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reqres := NewReqRes(req)
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// TODO: set cli.err if reqQueue times out
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cli.reqQueue <- reqres
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// Maybe auto-flush, or unset auto-flush
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switch req.Value.(type) {
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case *types.Request_Flush:
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cli.flushTimer.Unset()
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default:
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cli.flushTimer.Set()
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}
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return reqres
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}
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func (cli *socketClient) flushQueue() {
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cli.mtx.Lock()
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defer cli.mtx.Unlock()
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// mark all in-flight messages as resolved (they will get cli.Error())
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for req := cli.reqSent.Front(); req != nil; req = req.Next() {
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reqres := req.Value.(*ReqRes)
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reqres.Done()
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}
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// mark all queued messages as resolved
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LOOP:
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for {
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select {
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case reqres := <-cli.reqQueue:
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reqres.Done()
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default:
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break LOOP
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}
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}
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}
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//----------------------------------------
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func resMatchesReq(req *types.Request, res *types.Response) (ok bool) {
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switch req.Value.(type) {
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case *types.Request_Echo:
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_, ok = res.Value.(*types.Response_Echo)
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case *types.Request_Flush:
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_, ok = res.Value.(*types.Response_Flush)
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case *types.Request_Info:
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_, ok = res.Value.(*types.Response_Info)
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case *types.Request_DeliverTx:
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_, ok = res.Value.(*types.Response_DeliverTx)
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case *types.Request_CheckTx:
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_, ok = res.Value.(*types.Response_CheckTx)
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case *types.Request_Commit:
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_, ok = res.Value.(*types.Response_Commit)
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case *types.Request_Query:
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_, ok = res.Value.(*types.Response_Query)
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case *types.Request_InitChain:
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_, ok = res.Value.(*types.Response_InitChain)
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case *types.Request_BeginBlock:
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_, ok = res.Value.(*types.Response_BeginBlock)
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case *types.Request_EndBlock:
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_, ok = res.Value.(*types.Response_EndBlock)
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case *types.Request_ApplySnapshotChunk:
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_, ok = res.Value.(*types.Response_ApplySnapshotChunk)
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case *types.Request_LoadSnapshotChunk:
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_, ok = res.Value.(*types.Response_LoadSnapshotChunk)
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case *types.Request_ListSnapshots:
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_, ok = res.Value.(*types.Response_ListSnapshots)
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case *types.Request_OfferSnapshot:
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_, ok = res.Value.(*types.Response_OfferSnapshot)
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}
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return ok
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}
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func (cli *socketClient) stopForError(err error) {
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if !cli.IsRunning() {
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return
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}
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cli.mtx.Lock()
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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.socketClient 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.socketClient", "err", err)
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}
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}
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