145 lines
3.2 KiB
Go
145 lines
3.2 KiB
Go
package cmd
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import (
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"bufio"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"os/signal"
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"github.com/OpenSlides/OpenSlides/performance/client"
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"github.com/spf13/cobra"
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"github.com/vbauerster/mpb"
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"github.com/vbauerster/mpb/decor"
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)
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const connectHelp = `Opens many connections to the autoupdate-service
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Every connection is open and is waiting for messages. For each change-id
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you see a progress bar that shows how many connections got an answer for
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this change-id.`
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func cmdConnect(cfg *config) *cobra.Command {
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var connectionCount int
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cmd := &cobra.Command{
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Use: "connect",
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Short: "Opens many connections to autoupdate and keeps them open.",
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Long: connectHelp,
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RunE: func(cmd *cobra.Command, args []string) error {
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quit := make(chan struct{})
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go func() {
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt)
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<-c
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go func() {
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<-c
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os.Exit(2)
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}()
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close(quit)
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}()
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path := "/system/autoupdate"
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c, err := client.New(cfg.addr(), cfg.username, cfg.password)
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if err != nil {
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return fmt.Errorf("creating client: %w", err)
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}
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if err := c.Login(); err != nil {
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return fmt.Errorf("login client: %w", err)
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}
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progress := mpb.New()
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received := make(chan string, 1)
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for i := 0; i < connectionCount; i++ {
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go func() {
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r, err := keepOpen(cfg.addr(), c, path)
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if err != nil {
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log.Println("Can not create connection: %w", err)
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return
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}
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defer r.Close()
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scanner := bufio.NewScanner(r)
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const MB = 1 << 20
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scanner.Buffer(make([]byte, 10), 16*MB)
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for scanner.Scan() {
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msg, err := scannerAutoupdate(scanner.Text())
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if err != nil {
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if errors.Is(err, context.Canceled) {
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return
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}
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log.Printf("Error parsing received data: %v", err)
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continue
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}
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received <- msg
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}
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if err := scanner.Err(); err != nil {
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if errors.Is(err, context.Canceled) {
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return
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}
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log.Printf("Can not read body: %v", err)
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return
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}
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}()
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}
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cidToBar := make(map[string]*mpb.Bar)
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for {
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select {
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case <-quit:
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return nil
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case msg := <-received:
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bar, ok := cidToBar[msg]
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if !ok {
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bar = progress.AddBar(int64(connectionCount), mpb.PrependDecorators(decor.Name(msg)))
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cidToBar[msg] = bar
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}
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bar.Increment()
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}
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}
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},
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}
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cmd.Flags().IntVarP(&connectionCount, "amount", "a", 10, "Amount of users to use.")
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return cmd
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}
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func keepOpen(url string, c *client.Client, path string) (io.ReadCloser, error) {
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req, err := http.NewRequest("GET", url+path, nil)
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if err != nil {
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return nil, fmt.Errorf("creating request: %w", err)
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}
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resp, err := client.CheckStatus(c.Do(req))
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if err != nil {
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return nil, fmt.Errorf("sending %s request: %w", path, err)
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}
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return resp.Body, nil
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}
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func scannerAutoupdate(line string) (string, error) {
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if line == `{"connected":true}` {
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return "connect", nil
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}
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var format struct {
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ToChangeID int `json:"to_change_id"`
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}
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if err := json.Unmarshal([]byte(line), &format); err != nil {
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return "", fmt.Errorf("decode json: %v", err)
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}
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return fmt.Sprintf("change id %d", format.ToChangeID), nil
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}
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