Example of client send task and monitor task

benchmarks/experiments/Makefile

@@ -0,0 +1,26 @@
+DIST_DIRS := find * -type d -exec
+VERSION := $(shell perl -ne '/^var version.*"([^"]+)".*$$/ && print "v$$1\n"' main.go)
+GOTOOLS = \
+					github.com/mitchellh/gox
+
+tools:
+	go get $(GOTOOLS)
+
+get_vendor_deps:
+	@hash glide 2>/dev/null || go get github.com/Masterminds/glide
+	glide install
+
+build:
+	go build
+
+install:
+	go install
+
+test:
+	go test -race
+
+clean:
+	rm -f ./experiments
+	rm -rf ./dist
+
+.PHONY: tools get_vendor_deps build install test clean

benchmarks/experiments/glide.yaml

@@ -0,0 +1,12 @@
+package: github.com/tendermint/tendermint/benchmarks/experiments
+import:
+- package: github.com/tendermint/tendermint
+  version: v0.16.0
+  subpackages:
+  - rpc/client
+  - rpc/lib/types
+  - types
+- package: github.com/tendermint/tmlibs
+  version: v0.7.0
+  subpackages:
+  - log

benchmarks/experiments/main.go

@@ -0,0 +1,126 @@
+package main
+
+import (
+	"encoding/binary"
+	"fmt"
+	"math/rand"
+	"os"
+	"sync"
+	"time"
+
+	"context"
+
+	"github.com/tendermint/tendermint/rpc/client"
+	"github.com/tendermint/tendermint/types"
+	"github.com/tendermint/tmlibs/log"
+)
+
+var logger = log.NewNopLogger()
+var finishedTasks = 0
+var mutex = &sync.Mutex{}
+
+func main() {
+
+	var endpoint = "tcp://0.0.0.0:46657"
+
+	var httpClient = getHTTPClient(endpoint)
+
+	var res, err = httpClient.Status()
+	if err != nil {
+		logger.Info("something wrong happens", err)
+	}
+	logger.Info("received status", res)
+
+	go monitorTask(endpoint)
+
+	txCount := 10
+	var clientNumber = 10
+	for i := 0; i < clientNumber; i++ {
+		go clientTask(i, txCount, endpoint)
+	}
+	for finishedTasks < clientNumber+1 {
+	}
+	fmt.Printf("Done: %d\n", finishedTasks)
+}
+
+func clientTask(id, txCount int, endpoint string) {
+	var httpClient = getHTTPClient(endpoint)
+	for i := 0; i < txCount; i++ {
+		var _, err = httpClient.BroadcastTxSync(generateTx(id, rand.Int()))
+		if err != nil {
+			fmt.Printf("Something wrong happened: %s\n", err)
+		}
+	}
+	fmt.Printf("Finished client task: %d\n", id)
+
+	mutex.Lock()
+	finishedTasks++
+	mutex.Unlock()
+}
+
+func getHTTPClient(rpcAddr string) *client.HTTP {
+	return client.NewHTTP(rpcAddr, "/websocket")
+}
+
+func generateTx(i, valI int) []byte {
+	// a tx encodes the validator index, the tx number, and some random junk
+	tx := make([]byte, 250)
+	binary.PutUvarint(tx[:32], uint64(valI))
+	binary.PutUvarint(tx[32:64], uint64(i))
+	if _, err := rand.Read(tx[65:]); err != nil {
+		fmt.Println("err reading from crypto/rand", err)
+		os.Exit(1)
+	}
+	return tx
+}
+
+func monitorTask(endpoint string) {
+	fmt.Println("Monitor task started...")
+	var duration = 5 * time.Second
+
+	const subscriber = "monitor"
+	ctx, cancel := context.WithTimeout(context.Background(), duration)
+	defer cancel()
+	evts := make(chan interface{})
+
+	var httpClient = getHTTPClient(endpoint)
+	httpClient.Start()
+
+	evtTyp := types.EventNewBlockHeader
+
+	// register for the next event of this type
+	query := types.QueryForEvent(evtTyp)
+	err := httpClient.Subscribe(ctx, subscriber, query, evts)
+	if err != nil {
+		fmt.Println("error when subscribing", err)
+	}
+
+	// make sure to unregister after the test is over
+	defer httpClient.UnsubscribeAll(ctx, subscriber)
+
+	totalNumOfCommittedTxs := int64(0)
+
+	for {
+		fmt.Println("Starting main loop", err)
+		select {
+		case evt := <-evts:
+			event := evt.(types.TMEventData)
+			header, ok := event.Unwrap().(types.EventDataNewBlockHeader)
+			if ok {
+				fmt.Println("received header\n", header.Header.StringIndented(""))
+			} else {
+				fmt.Println("not able to unwrap header")
+			}
+			// Do some metric computation with header
+			totalNumOfCommittedTxs += header.Header.NumTxs
+
+		case <-ctx.Done():
+			fmt.Printf("Finished monitor task. Received %d transactions \n", totalNumOfCommittedTxs)
+
+			mutex.Lock()
+			finishedTasks++
+			mutex.Unlock()
+			return
+		}
+	}
+}