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main.go
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main.go
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package main
import (
"encoding/csv"
"encoding/json"
"flag"
"fmt"
"io"
"net/http"
"net/http/httptrace"
"os"
"strings"
"sync"
"time"
)
type RequestDefinition struct {
ID string `json:"id"`
URL string `json:"url"`
Method string `json:"method"`
Headers map[string]string `json:"headers"`
Body string `json:"body"`
}
func (rd *RequestDefinition) PrepareRequest() (*http.Request, error) {
req, err := http.NewRequest(rd.Method, rd.URL, strings.NewReader(rd.Body))
if err != nil {
return nil, err
}
for k, v := range rd.Headers {
if strings.EqualFold(k, "host") {
req.Host = v
} else {
req.Header.Add(k, v)
}
}
return req, nil
}
type RequestMetrics struct {
ID string `json:"id"`
StartTime time.Time `json:"start"`
Duration time.Duration `json:"duration"`
Status string `json:"status"`
StatusCode int `json:"statusCode"`
Error string `json:"error"`
ConnStartTime time.Time `json:"connStartTime"`
ConnDuration time.Duration `json:"connDuration"`
ConnEndTime time.Time `json:"connEndTime"`
DialStartTime time.Time `json:"dialStartTime"`
DialDuration time.Duration `json:"dialDuration"`
DNSStartTime time.Time `json:"dnsStartTime"`
DNSDuration time.Duration `json:"dnsDuration"`
RequestDuration time.Duration `json:"requestDuration"`
}
func (rm *RequestMetrics) ToCSVRow() []string {
return []string{
rm.ID,
rm.StartTime.Format(time.RFC3339),
fmt.Sprintf("%d", rm.Duration.Nanoseconds()),
fmt.Sprintf("%d", rm.ConnDuration.Nanoseconds()),
fmt.Sprintf("%d", rm.DialDuration.Nanoseconds()),
fmt.Sprintf("%d", rm.DNSDuration.Nanoseconds()),
fmt.Sprintf("%d", rm.RequestDuration.Nanoseconds()),
rm.Status,
fmt.Sprintf("%d", rm.StatusCode),
rm.Error,
}
}
func GetRequestMetricsCSVHeader() []string {
return []string{"ID", "StartTime", "Duration_ns", "ConnDuration_ns", "DialDuration_ns", "DNSDuration_ns", "RequestDuration_ns", "Status", "StatusCode", "Error"}
}
func MakeRequest(client *http.Client, requestDefinition *RequestDefinition) (RequestMetrics, error) {
var requestMetrics RequestMetrics = RequestMetrics{ID: requestDefinition.ID}
req, err := requestDefinition.PrepareRequest()
if err != nil {
requestMetrics.Error = fmt.Sprint(err)
return requestMetrics, err
}
clientTrace := &httptrace.ClientTrace{
GetConn: func(hostPort string) {
requestMetrics.ConnStartTime = time.Now()
},
DNSStart: func(info httptrace.DNSStartInfo) {
requestMetrics.DNSStartTime = time.Now()
},
DNSDone: func(info httptrace.DNSDoneInfo) {
requestMetrics.DNSDuration = time.Since(requestMetrics.DNSStartTime)
},
ConnectStart: func(network, addr string) {
requestMetrics.DialStartTime = time.Now()
},
ConnectDone: func(network, addr string, err error) {
requestMetrics.DialDuration = time.Since(requestMetrics.DialStartTime)
requestMetrics.ConnEndTime = time.Now()
},
GotConn: func(info httptrace.GotConnInfo) {
requestMetrics.ConnDuration = time.Since(requestMetrics.ConnStartTime)
},
WroteRequest: func(info httptrace.WroteRequestInfo) {
requestMetrics.RequestDuration = time.Since(requestMetrics.ConnEndTime)
},
}
clientTraceCtx := httptrace.WithClientTrace(req.Context(), clientTrace)
req = req.WithContext(clientTraceCtx)
requestMetrics.StartTime = time.Now()
resp, err := client.Do(req)
if err != nil {
requestMetrics.Error = fmt.Sprint(err)
return requestMetrics, err
}
resp.Body.Close()
requestMetrics.Status = resp.Status
requestMetrics.StatusCode = resp.StatusCode
requestMetrics.Duration = time.Since(requestMetrics.StartTime)
return requestMetrics, nil
}
func RunTests(requestDefinitions []*RequestDefinition, threads int, duration time.Duration) {
var wg sync.WaitGroup
var stopTime time.Time = time.Now().Add(duration)
var writer *csv.Writer = csv.NewWriter(os.Stdout)
var metricsChannel chan RequestMetrics = make(chan RequestMetrics, threads)
if err := writer.Write(GetRequestMetricsCSVHeader()); err != nil {
fmt.Fprintf(os.Stderr, "Error writing CSV header: %v", err)
return
}
wg.Add(threads)
for i := 0; i < threads; i++ {
go func(i int) {
defer wg.Done()
var transport *http.Transport = http.DefaultTransport.(*http.Transport).Clone()
transport.MaxConnsPerHost = len(requestDefinitions)
transport.MaxIdleConnsPerHost = len(requestDefinitions)
var client *http.Client = &http.Client{
Timeout: time.Second * 10,
Transport: transport,
}
for time.Now().Before(stopTime) {
for _, reqDefinition := range requestDefinitions {
requestMetrics, err := MakeRequest(client, reqDefinition)
if err != nil {
fmt.Fprintf(os.Stderr, "Error making request: %v", err)
}
metricsChannel <- requestMetrics
}
}
}(i)
}
go func() {
for requestMetrics := range metricsChannel {
csvRow := requestMetrics.ToCSVRow()
if err := writer.Write(csvRow); err != nil {
fmt.Fprintf(os.Stderr, "Error writing CSV header: %v", err)
}
writer.Flush()
}
}()
wg.Wait()
close(metricsChannel)
}
func main() {
var threads int
var durationString string
var requestDefinitions []*RequestDefinition
flag.IntVar(&threads, "threads", 1, "Number of threads")
flag.StringVar(&durationString, "duration", "10s", "Duration to run the test (e.g., 10s, 1m, 2h)")
flag.Parse()
stdin, err := io.ReadAll(os.Stdin)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading from stdin: %v\n", err)
os.Exit(1)
}
err = json.Unmarshal(stdin, &requestDefinitions)
if err != nil {
fmt.Fprintf(os.Stderr, "Error unmarshaling from stdin: %v\n", err)
os.Exit(1)
}
duration, err := time.ParseDuration(durationString)
if err != nil {
fmt.Fprintf(os.Stderr, "Error parsing duration: %v", err)
os.Exit(1)
}
RunTests(requestDefinitions, threads, duration)
}