Let the client send health checks periodically
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parent
82a1284073
commit
64dd9429be
1 changed files with 130 additions and 81 deletions
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@ -20,16 +20,16 @@ limitations under the License.
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package main
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import (
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"context"
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"fmt"
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"log"
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"os"
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"sync"
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"time"
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"git.cacert.org/cacert-gosigner/pkg/messages"
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"github.com/justincpresley/go-cobs"
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"github.com/shamaton/msgpackgen/msgpack"
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"git.cacert.org/cacert-gosigner/pkg/messages"
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)
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const cobsDelimiter = 0x00
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@ -37,108 +37,157 @@ const cobsDelimiter = 0x00
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var cobsConfig = cobs.Config{SpecialByte: cobsDelimiter, Delimiter: true, EndingSave: true}
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func main() {
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errorLog := log.New(os.Stderr, "", log.LstdFlags)
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sim := &clientSimulator{
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errorLog: errorLog,
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}
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err := sim.Run()
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if err != nil {
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errorLog.Printf("simulator returned an error: %v", err)
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}
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}
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type clientSimulator struct {
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errorLog *log.Logger
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commands chan messages.Command
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responses chan []byte
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}
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func (c *clientSimulator) writeTestCommands(ctx context.Context) error {
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messages.RegisterGeneratedResolver()
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const healthInterval = 10 * time.Second
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timer := time.NewTimer(healthInterval)
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for {
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select {
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case <-ctx.Done():
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_ = timer.Stop()
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return nil
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case <-timer.C:
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c.commands <- messages.Command{
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Code: messages.CmdHealth,
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TimeStamp: time.Now().UTC(),
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}
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timer.Reset(healthInterval)
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}
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}
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}
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func (c *clientSimulator) handleInput(ctx context.Context) error {
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const (
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bufferSize = 1024 * 1024
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readInterval = 50 * time.Millisecond
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)
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errors := make(chan error)
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buf := make([]byte, bufferSize)
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errorLog := log.New(os.Stderr, "", log.LstdFlags)
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for {
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select {
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case <-ctx.Done():
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return nil
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default:
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count, err := os.Stdin.Read(buf)
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if err != nil {
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return err
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}
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if count == 0 {
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time.Sleep(readInterval)
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continue
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}
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data := buf[:count]
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err = cobs.Verify(data, cobsConfig)
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if err != nil {
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return err
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}
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c.responses <- cobs.Decode(data, cobsConfig)
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}
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}
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}
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func (c *clientSimulator) handleCommands(ctx context.Context) error {
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for {
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select {
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case command := <-c.commands:
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commandBytes, err := msgpack.Marshal(command)
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if err != nil {
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return fmt.Errorf("could not marshal command bytes: %w", err)
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}
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_, err = os.Stdout.Write(cobs.Encode(commandBytes, cobsConfig))
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if err != nil {
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return fmt.Errorf("write failed: %w", err)
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}
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responseBytes := <-c.responses
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var response messages.Response
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err = msgpack.Unmarshal(responseBytes, &response)
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if err != nil {
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return fmt.Errorf("could not unmarshal msgpack data: %w", err)
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}
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c.errorLog.Printf("received response: %+v", response)
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case <-ctx.Done():
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return nil
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}
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}
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}
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func (c *clientSimulator) Run() error {
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ctx, cancel := context.WithCancel(context.Background())
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c.commands = make(chan messages.Command)
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c.responses = make(chan []byte)
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wg := sync.WaitGroup{}
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wg.Add(1)
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wg.Add(2)
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done := make(chan struct{})
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frame := make(chan []byte)
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var inputError, commandError error
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go func(done chan struct{}) {
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buf := make([]byte, bufferSize)
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go func(inputErr error) {
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inputError = c.handleInput(ctx)
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for {
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select {
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case <-done:
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wg.Done()
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cancel()
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return
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wg.Done()
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}(inputError)
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default:
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count, err := os.Stdin.Read(buf)
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if err != nil {
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errors <- err
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go func(commandErr error) {
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commandErr = c.handleCommands(ctx)
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wg.Done()
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cancel()
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return
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}
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wg.Done()
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}(commandError)
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if count == 0 {
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time.Sleep(readInterval)
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var result error
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continue
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}
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data := buf[:count]
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err = cobs.Verify(data, cobsConfig)
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if err != nil {
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errors <- err
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wg.Done()
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return
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}
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frame <- cobs.Decode(data, cobsConfig)
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}
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}
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}(done)
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err := writeTestCommands(frame, errorLog)
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if err != nil {
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errorLog.Printf("could not write test commands")
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}
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err = <-errors
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if err != nil {
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errorLog.Printf("error: %v", err)
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if err := c.writeTestCommands(ctx); err != nil {
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c.errorLog.Printf("test commands failed: %v", err)
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}
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cancel()
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wg.Wait()
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}
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func writeTestCommands(responses chan []byte, errorLog *log.Logger) error {
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messages.RegisterGeneratedResolver()
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commands := []messages.Command{
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{
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Code: messages.CmdHealth,
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TimeStamp: time.Now().UTC(),
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},
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if inputError != nil {
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c.errorLog.Printf("reading input failed: %v", inputError)
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}
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for _, command := range commands {
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commandBytes, err := msgpack.Marshal(command)
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if err != nil {
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return fmt.Errorf("could not marshal command bytes: %w", err)
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}
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_, err = os.Stdout.Write(cobs.Encode(commandBytes, cobsConfig))
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if err != nil {
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return fmt.Errorf("write failed: %w", err)
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}
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responseBytes := <-responses
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var response messages.Response
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err = msgpack.Unmarshal(responseBytes, &response)
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if err != nil {
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return fmt.Errorf("could not unmarshal msgpack data: %w", err)
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}
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errorLog.Printf("received response: %+v", response)
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if commandError != nil {
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c.errorLog.Printf("sending commands failed: %v", commandError)
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}
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return nil
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return result
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}
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