You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: stresser.go
    path of file: ./repos/learning/golang/practice/go-crontab/gopath/src/github.com/coreos/etcd/functional/tester
    
    the code of the file until where you have to start completion: // Copyright 2018 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package tester

import (
	"fmt"
	"time"

	"github.com/coreos/etcd/functional/rpcpb"

	"go.uber.org/zap"
)

// Stresser defines stressing client operations.
type Stresser interface {
	// Stress starts to stress the etcd cluster
	Stress() error
	// Pause stops the stresser from sending requests to etcd. Resume by calling Stress.
	Pause() map[string]int
	// Close releases all of the Stresser's resources.
	Close() map[string]int
	// ModifiedKeys reports the number of keys created and deleted by stresser
	ModifiedKeys() int64
}

// newStresser creates stresser from a comma separated list of stresser types.
func newStresser(clus *Cluster, m *rpcpb.Member) (stressers []Stresser) {
	// TODO: Too intensive stressing clients can panic etcd member with
	// 'out of memory' error. Put rate limits in server side.
	ks := &keyStresser{
		lg:                clus.lg,
		m:                 m,
		keySize:           int(clus.Tester.StressKeySize),
		keyLargeSize:      int(clus.Tester.StressKeySizeLarge),
		keySuffixRange:    int(clus.Tester.StressKeySuffixRange),
		keyTxnSuffixRange: int(clus.Tester.StressKeySuffixRangeTxn),
		keyTxnOps:         int(clus.Tester.StressKeyTxnOps),
		clientsN:          int(clus.Tester.StressClients),
		rateLimiter:       clus.rateLimiter,
	}
	ksExist := false

	for _, s := range clus.Tester.Stressers {
		clus.lg.Info(
			"creating stresser",
			zap.String("type", s.Type),
			zap.Float64("weight", s.Weight),
			zap.String("endpoint", m.EtcdClientEndpoint),
		)
		switch s.Type {
		case "KV_WRITE_SMALL":
			ksExist = true
			ks.weightKVWriteSmall = s.Weight
		case "KV_WRITE_LARGE":
			ksExist = true
			ks.weightKVWriteLarge = s.Weight
		case "KV_READ_ONE_KEY":
			ksExist = true
			ks.weightKVReadOneKey = s.Weight
		case "KV_READ_RANGE":
			ksExist = true
			ks.weightKVReadRange = s.Weight
		case "KV_DELETE_ONE_KEY":
			ksExist = true
			ks.weightKVDeleteOneKey = s.Weight
		case "KV_DELETE_RANGE":
			ksExist = true
			ks.weightKVDeleteRange = s.Weight
		case "KV_TXN_WRITE_DELETE":
			ksExist = true
			ks.weightKVTxnWriteDelete = s.Weight

		case "LEASE":
			stressers = append(stressers, &leaseStresser{
				stype:        rpcpb.StresserType_LEASE,
				lg:           clus.lg,
				m:            m,
				numLeases:    10, // TODO: configurable
				keysPerLease: 10, // TODO: configurable
				rateLimiter:  clus.rateLimiter,
			})

		case "ELECTION_RUNNER":
			reqRate := 100
			args := []string{
				"election",
				fmt.Sprintf("%v", time.Now().UnixNano()), // election name as current nano time
				"--dial-timeout=10s",
				"--endpoints", m.EtcdClientEndpoint,
				"--total-client-connections=10",
				"--rounds=0", // runs forever
				"--req-rate", fmt.Sprintf("%v", reqRate),
			}
			stressers = append(stressers, newRunnerStresser(
				rpcpb.StresserType_ELECTION_RUNNER,
				m.EtcdClientEndpoint,
				clus.lg,
				clus.Tester.RunnerExecPath,
				args,
				clus.rateLimiter,
				reqRate,
			))

		case "WATCH_RUNNER":
			reqRate := 100
			args := []string{
				"watcher",
				"--prefix", fmt.Sprintf("%v", time.Now().UnixNano()), // prefix all keys with nano time
				"--total-keys=1",
				"--total-prefixes=1",
				"--watch-per-prefix=1",
				"--endpoin
    
func newStresser(clus *Cluster, m *rpcpb.Member) (stressers []Stresser) {
	// TODO: Too intensive stressing clients can panic etcd member with
	// 'out of memory' error. Put rate limits in server side.
	ks := &keyStresser{
		lg:                clus.lg,
		m:                 m,
		keySize:           int(clus.Tester.StressKeySize),
		keyLargeSize:      int(clus.Tester.StressKeySizeLarge),
		keySuffixRange:    int(clus.Tester.StressKeySuffixRange),
		keyTxnSuffixRange: int(clus.Tester.StressKeySuffixRangeTxn),
		keyTxnOps:         int(clus.Tester.StressKeyTxnOps),
		clientsN:          int(clus.Tester.StressClients),
		rateLimiter:       clus.rateLimiter,
	}
	ksExist := false

	for _, s := range clus.Tester.Stressers {
		clus.lg.Info(
			"creating stresser",
			zap.String("type", s.Type),
			zap.Float64("weight", s.Weight),
			zap.String("endpoint", m.EtcdClientEndpoint),
		)
		switch s.Type {
		case "KV_WRITE_SMALL":
			ksExist = true
			ks.weightKVWriteSmall = s.Weight
		case "KV_WRITE_LARGE":
			ksExist = true
			ks.weightKVWriteLarge = s.Weight
		case "KV_READ_ONE_KEY":
			ksExist = true
			ks.weightKVReadOneKey = s.Weight
		case "KV_READ_RANGE":
			ksExist = true
			ks.weightKVReadRange = s.Weight
		case "KV_DELETE_ONE_KEY":
			ksExist = true
			ks.weightKVDeleteOneKey = s.Weight
		case "KV_DELETE_RANGE":
			ksExist = true
			ks.weightKVDeleteRange = s.Weight
		case "KV_TXN_WRITE_DELETE":
			ksExist = true
			ks.weightKVTxnWriteDelete = s.Weight

		case "LEASE":
			stressers = append(stressers, &leaseStresser{
				stype:        rpcpb.StresserType_LEASE,
				lg:           clus.lg,
				m:            m,
				numLeases:    10, // TODO: configurable
				keysPerLease: 10, // TODO: configurable
				rateLimiter:  clus.rateLimiter,
			})

		case "ELECTION_RUNNER":
			reqRate := 100
			args := []string{
				"election",
				fmt.Sprintf("%v", time.Now().UnixNano()), // election name as current nano time
				"--dial-timeout=10s",
				"--endpoints", m.EtcdClientEndpoint,
				"--total-client-connections=10",
				"--rounds=0", // runs forever
				"--req-rate", fmt.Sprintf("%v", reqRate),
			}
			stressers = append(stressers, newRunnerStresser(
				rpcpb.StresserType_ELECTION_RUNNER,
				m.EtcdClientEndpoint,
				clus.lg,
				clus.Tester.RunnerExecPath,
				args,
				clus.rateLimiter,
				reqRate,
			))

		case "WATCH_RUNNER":
			reqRate := 100
			args := []string{
				"watcher",
				"--prefix", fmt.Sprintf("%v", time.Now().UnixNano()), // prefix all keys with nano time
				"--total-keys=1",
				"--total-prefixes=1",
				"--watch-per-prefix=1",
				"--endpoints", m.EtcdClientEndpoint,
				"--rounds=0", // runs forever
				"--req-rate", fmt.Sprintf("%v", reqRate),
			}
			stressers = append(stressers, newRunnerStresser(
				rpcpb.StresserType_WATCH_RUNNER,
				m.EtcdClientEndpoint,
				clus.lg,
				clus.Tester.RunnerExecPath,
				args,
				clus.rateLimiter,
				reqRate,
			))

		case "LOCK_RACER_RUNNER":
			reqRate := 100
			args := []string{
				"lock-racer",
				fmt.Sprintf("%v", time.Now().UnixNano()), // locker name as current nano time
				"--endpoints", m.EtcdClientEndpoint,
				"--total-client-connections=10",
				"--rounds=0", // runs forever
				"--req-rate", fmt.Sprintf("%v", reqRate),
			}
			stressers = append(stressers, newRunnerStresser(
				rpcpb.StresserType_LOCK_RACER_RUNNER,
				m.EtcdClientEndpoint,
				clus.lg,
				clus.Tester.RunnerExecPath,
				args,
				clus.rateLimiter,
				reqRate,
			))

		case "LEASE_RUNNER":
			args := []string{
				"lease-renewer",
				"--ttl=30",
				"--endpoints", m.EtcdClientEndpoint,
			}
			stressers = append(stressers, newRunnerStresser(
				rpcpb.StresserType_LEASE_RUNNER,
				m.EtcdClientEndpoint,
				clus.lg,
				clus.Tester.RunnerExecPath,
				args,
				clus.rateLimiter,
				0,
			))
		}
	}

	if ksExist {
		return append(stressers, ks)
	}
	return stressers
}