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curl.go
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curl.go
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// Package curl implements the curl command chain.
package curl
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"sort"
"strconv"
"sync"
"time"
"github.com/dustin/go-humanize"
"github.com/spf13/cobra"
fly "github.com/superfly/fly-go"
"github.com/superfly/flyctl/internal/command"
"github.com/superfly/flyctl/internal/config"
"github.com/superfly/flyctl/internal/flag"
"github.com/superfly/flyctl/internal/flyutil"
"github.com/superfly/flyctl/internal/render"
"github.com/superfly/flyctl/iostreams"
)
// New initializes and returns a new apps Command.
func New() (cmd *cobra.Command) {
const (
short = "Run a performance test against a URL"
long = short + "\n"
)
cmd = command.New("curl <URL>", short, long, run,
command.RequireSession,
)
cmd.Deprecated = "`fly curl` will be removed in a future release"
cmd.Hidden = true
cmd.Args = cobra.ExactArgs(1)
flag.Add(cmd, flag.JSONOutput())
return
}
func run(ctx context.Context) error {
url, err := url.Parse(flag.FirstArg(ctx))
if err != nil {
return fmt.Errorf("invalid URL specified: %w", err)
}
regionCodes, err := fetchRegionCodes(ctx)
if err != nil {
return err
}
rws, err := prepareRequestWrappers(ctx, url, regionCodes)
if err != nil {
return err
}
timings := gatherTimings(ctx, rws)
if err := ctx.Err(); err != nil {
return err
}
if io := iostreams.FromContext(ctx); !config.FromContext(ctx).JSONOutput {
renderTextTimings(io.Out, io.ColorScheme(), timings)
} else {
renderJSONTimings(io.Out, timings)
}
return nil
}
func fetchRegionCodes(ctx context.Context) (codes []string, err error) {
client := flyutil.ClientFromContext(ctx)
var regions []fly.Region
if regions, _, err = client.PlatformRegions(ctx); err != nil {
err = fmt.Errorf("failed retrieving regions: %w", err)
return
} else if len(regions) == 0 {
err = errors.New("no regions could be retrieved")
return
}
for _, region := range regions {
codes = append(codes, region.Code)
}
sort.Strings(codes)
return
}
func prepareRequestWrappers(ctx context.Context, url *url.URL, regionCodes []string) (rws []*requestWrapper, err error) {
for _, region := range regionCodes {
var rw *requestWrapper
if rw, err = wrapRequestForRegion(ctx, region, url); err != nil {
err = fmt.Errorf("failed preparing request for %s: %w", region, err)
break
}
rws = append(rws, rw)
}
return
}
func gatherTimings(ctx context.Context, rws []*requestWrapper) (timings []*timing) {
var wg sync.WaitGroup
wg.Add(len(rws))
c := make(chan *timing, len(rws))
for i := range rws {
go func(rw *requestWrapper) {
defer wg.Done()
rw.time(c)
}(rws[i])
}
wg.Wait()
close(c)
for t := range c {
timings = append(timings, t)
}
sort.Slice(timings, func(i, j int) bool {
return timings[i].region < timings[j].region
})
return
}
type requestWrapper struct {
request *http.Request
regionCode string
}
func wrapRequestForRegion(ctx context.Context, regionCode string, url *url.URL) (rw *requestWrapper, err error) {
payload := struct {
URL string `json:"url"`
Region string `json:"region"`
}{
URL: url.String(),
Region: regionCode,
}
var buf bytes.Buffer
if err = json.NewEncoder(&buf).Encode(payload); err != nil {
return
}
var r *http.Request
if r, err = http.NewRequestWithContext(ctx, http.MethodPost, "https://curl.fly.dev/timings", &buf); err != nil {
return
}
r.Header.Add("Authorization", "1q2w3e4r")
r.Header.Add("Content-Type", "application/json")
rw = &requestWrapper{
request: r,
regionCode: regionCode,
}
return
}
var httpClient = &http.Client{
Timeout: time.Second * 3,
}
func (rw *requestWrapper) time(c chan<- *timing) {
t := &timing{
region: rw.regionCode,
}
defer func() {
c <- t
}()
res, err := httpClient.Do(rw.request)
if err != nil {
t.error = err
return
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
if body, err := io.ReadAll(res.Body); err == nil {
t.error = errors.New(string(body))
} else {
t.error = err
}
return
}
if err := json.NewDecoder(res.Body).Decode(t); err != nil {
t.error = fmt.Errorf("failed decoding response for %s: %w", rw.regionCode, err)
}
}
type timing struct {
error
region string
HTTPCode int `json:"http_code"`
SpeedDownload int `json:"speed_download"`
TimeTotal float64 `json:"time_total"`
TimeNameLookup float64 `json:"time_namelookup"`
TimeConnect float64 `json:"time_connect"`
TimePreTransfer float64 `json:"time_pretransfer"`
TimeAppConnect float64 `json:"time_appconnect"`
TimeStartTransfer float64 `json:"time_starttransfer"`
HTTPVersion string `json:"http_version"`
RemoteIP string `json:"remote_ip"`
Scheme string `json:"scheme"`
}
func (t *timing) formatedHTTPCode(cs *iostreams.ColorScheme) string {
text := strconv.Itoa(t.HTTPCode)
return colorize(cs, text, float64(t.HTTPCode), 299, 399)
}
func (t *timing) formattedDNS() string {
return humanize.FtoaWithDigits(t.TimeNameLookup*1000, 1) + "ms"
}
func (t *timing) formattedConnect(cs *iostreams.ColorScheme) string {
timing := t.TimeConnect * 1000
text := humanize.FtoaWithDigits(timing, 1) + "ms"
return colorize(cs, text, timing, 200, 500)
}
func (t *timing) formattedTLS() string {
return humanize.FtoaWithDigits((t.TimeAppConnect+t.TimePreTransfer)*1000, 1) + "ms"
}
func (t *timing) formattedTTFB(cs *iostreams.ColorScheme) string {
timing := t.TimeStartTransfer * 1000
text := humanize.FtoaWithDigits(timing, 1) + "ms"
return colorize(cs, text, timing, 400, 1000)
}
func (t *timing) formattedTotal() string {
timing := t.TimeTotal * 1000
return humanize.FtoaWithDigits(timing, 1) + "ms"
}
func colorize(cs *iostreams.ColorScheme, text string, val, greenCutoff, yellowCutoff float64) string {
var fn func(string) string
switch {
case val <= greenCutoff:
fn = cs.Green
case val <= yellowCutoff:
fn = cs.Yellow
default:
fn = cs.Red
}
return fn(text)
}
func renderTextTimings(w io.Writer, cs *iostreams.ColorScheme, timings []*timing) {
var rows [][]string
for _, t := range timings {
if t.error != nil {
continue
}
rows = append(rows, []string{
t.region,
t.formatedHTTPCode(cs),
t.formattedDNS(),
t.formattedConnect(cs),
t.formattedTLS(),
t.formattedTTFB(cs),
t.formattedTotal(),
})
}
render.Table(w, "", rows, "Region", "Status", "DNS", "Connect", "TLS", "TTFB", "Total")
rows = rows[:0]
for _, t := range timings {
if t.error == nil {
continue
}
rows = append(rows, []string{
t.region,
t.Error(),
})
}
if len(rows) == 0 {
return
}
render.Table(w, "Failures", rows, "Region", "Error")
}
func renderJSONTimings(w io.Writer, timings []*timing) {
items := make(map[string]interface{}, len(timings))
for _, t := range timings {
if t.error != nil {
items[t.region] = struct {
Error string `json:"error"`
}{
Error: t.error.Error(),
}
} else {
items[t.region] = t
}
}
render.JSON(w, items)
}