From ef93c958532d7a827033a491ee55e711f00f4ecb Mon Sep 17 00:00:00 2001
From: Jae Kwon <jae@tendermint.com>
Date: Sun, 8 Nov 2015 15:18:58 -0800
Subject: [PATCH] Added new Flush request/response type

---
 server/server.go  | 19 ++++++++++++++++---
 types/messages.go | 40 ++++++++++++++++++++++++++--------------
 2 files changed, 42 insertions(+), 17 deletions(-)

diff --git a/server/server.go b/server/server.go
index 2b22300e4..161e5e0b7 100644
--- a/server/server.go
+++ b/server/server.go
@@ -1,6 +1,7 @@
 package server
 
 import (
+	"bufio"
 	"fmt"
 	"net"
 	"reflect"
@@ -51,11 +52,12 @@ func StartListener(protoAddr string, app types.Application) (net.Listener, error
 // Read requests from conn and deal with them
 func handleRequests(app types.Application, connClosed chan struct{}, conn net.Conn, responses chan<- types.Response) {
 	var count int
+	var bufReader = bufio.NewReader(conn)
 	for {
 		var n int64
 		var err error
 		var req types.Request
-		wire.ReadBinaryPtr(&req, conn, &n, &err)
+		wire.ReadBinaryPtr(&req, bufReader, &n, &err)
 
 		if err != nil {
 			fmt.Println(err.Error())
@@ -77,6 +79,8 @@ func handleRequest(app types.Application, req types.Request, responses chan<- ty
 	case types.RequestEcho:
 		retCode, msg := app.Echo(req.Message)
 		responses <- types.ResponseEcho{retCode, msg}
+	case types.RequestFlush:
+		responses <- types.ResponseFlush{}
 	case types.RequestAppendTx:
 		retCode := app.AppendTx(req.TxBytes)
 		responses <- types.ResponseAppendTx{retCode}
@@ -116,18 +120,27 @@ func handleRequest(app types.Application, req types.Request, responses chan<- ty
 // Pull responses from 'responses' and write them to conn.
 func handleResponses(connClosed chan struct{}, responses <-chan types.Response, conn net.Conn) {
 	var count int
+	var bufWriter = bufio.NewWriter(conn)
 	for {
 		var res = <-responses
 		var n int64
 		var err error
-		wire.WriteBinary(res, conn, &n, &err)
-
+		wire.WriteBinary(res, bufWriter, &n, &err)
 		if err != nil {
 			fmt.Println(err.Error())
 			connClosed <- struct{}{}
 			return
 		}
 
+		if _, ok := res.(types.ResponseFlush); ok {
+			err = bufWriter.Flush()
+			if err != nil {
+				fmt.Println(err.Error())
+				connClosed <- struct{}{}
+				return
+			}
+		}
+
 		count++
 		if count%1000 == 0 {
 			fmt.Println("Sent response", reflect.TypeOf(res), res, n, err, count)
diff --git a/types/messages.go b/types/messages.go
index da4731ae9..70470a2de 100644
--- a/types/messages.go
+++ b/types/messages.go
@@ -4,22 +4,24 @@ import "github.com/tendermint/go-wire"
 
 const (
 	requestTypeEcho          = byte(0x01)
-	requestTypeAppendTx      = byte(0x02)
-	requestTypeGetHash       = byte(0x03)
-	requestTypeCommit        = byte(0x04)
-	requestTypeRollback      = byte(0x05)
-	requestTypeSetEventsMode = byte(0x06)
-	requestTypeAddListener   = byte(0x07)
-	requestTypeRemListener   = byte(0x08)
+	requestTypeFlush         = byte(0x02)
+	requestTypeAppendTx      = byte(0x03)
+	requestTypeGetHash       = byte(0x04)
+	requestTypeCommit        = byte(0x05)
+	requestTypeRollback      = byte(0x06)
+	requestTypeSetEventsMode = byte(0x07)
+	requestTypeAddListener   = byte(0x08)
+	requestTypeRemListener   = byte(0x09)
 
 	responseTypeEcho          = byte(0x11)
-	responseTypeAppendTx      = byte(0x12)
-	responseTypeGetHash       = byte(0x13)
-	responseTypeCommit        = byte(0x14)
-	responseTypeRollback      = byte(0x15)
-	responseTypeSetEventsMode = byte(0x16)
-	responseTypeAddListener   = byte(0x17)
-	responseTypeRemListener   = byte(0x18)
+	responseTypeFlush         = byte(0x12)
+	responseTypeAppendTx      = byte(0x13)
+	responseTypeGetHash       = byte(0x14)
+	responseTypeCommit        = byte(0x15)
+	responseTypeRollback      = byte(0x16)
+	responseTypeSetEventsMode = byte(0x17)
+	responseTypeAddListener   = byte(0x18)
+	responseTypeRemListener   = byte(0x19)
 
 	responseTypeException = byte(0x20)
 	responseTypeEvent     = byte(0x21)
@@ -31,6 +33,9 @@ type RequestEcho struct {
 	Message string
 }
 
+type RequestFlush struct {
+}
+
 type RequestAppendTx struct {
 	TxBytes []byte
 }
@@ -61,6 +66,7 @@ type Request interface {
 }
 
 func (_ RequestEcho) AssertRequestType()          {}
+func (_ RequestFlush) AssertRequestType()         {}
 func (_ RequestAppendTx) AssertRequestType()      {}
 func (_ RequestGetHash) AssertRequestType()       {}
 func (_ RequestCommit) AssertRequestType()        {}
@@ -72,6 +78,7 @@ func (_ RequestRemListener) AssertRequestType()   {}
 var _ = wire.RegisterInterface(
 	struct{ Request }{},
 	wire.ConcreteType{RequestEcho{}, requestTypeEcho},
+	wire.ConcreteType{RequestFlush{}, requestTypeFlush},
 	wire.ConcreteType{RequestAppendTx{}, requestTypeAppendTx},
 	wire.ConcreteType{RequestGetHash{}, requestTypeGetHash},
 	wire.ConcreteType{RequestCommit{}, requestTypeCommit},
@@ -88,6 +95,9 @@ type ResponseEcho struct {
 	Message string
 }
 
+type ResponseFlush struct {
+}
+
 type ResponseAppendTx struct {
 	RetCode
 }
@@ -130,6 +140,7 @@ type Response interface {
 }
 
 func (_ ResponseEcho) AssertResponseType()          {}
+func (_ ResponseFlush) AssertResponseType()         {}
 func (_ ResponseAppendTx) AssertResponseType()      {}
 func (_ ResponseGetHash) AssertResponseType()       {}
 func (_ ResponseCommit) AssertResponseType()        {}
@@ -143,6 +154,7 @@ func (_ ResponseEvent) AssertResponseType()         {}
 var _ = wire.RegisterInterface(
 	struct{ Response }{},
 	wire.ConcreteType{ResponseEcho{}, responseTypeEcho},
+	wire.ConcreteType{ResponseFlush{}, responseTypeFlush},
 	wire.ConcreteType{ResponseAppendTx{}, responseTypeAppendTx},
 	wire.ConcreteType{ResponseGetHash{}, responseTypeGetHash},
 	wire.ConcreteType{ResponseCommit{}, responseTypeCommit},