Jan Dittberner
3107ad8abb
This commit adds basic serial link and protocol support. None of the commands from the docs/design.md document is implemented yet. The following new packages have been added: - seriallink containing the serial link handler including COBS decoding and encoding - protocol containing the protocol handler including msgpack unmarshalling and marshaling - health containing a rudimentary health check implementation - messages containing command and response types and generated msgpack marshaling code A client simulation command has been added in cmd/clientsim. README.md got instructions how to run the client simulator. The docs/config.sample.yaml contains a new section for the serial connection parameters.
144 lines
2.7 KiB
Go
144 lines
2.7 KiB
Go
/*
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Copyright 2022 CAcert Inc.
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SPDX-License-Identifier: Apache-2.0
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// client simulator
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package main
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import (
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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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"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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var cobsConfig = cobs.Config{SpecialByte: cobsDelimiter, Delimiter: true, EndingSave: true}
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func main() {
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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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errorLog := log.New(os.Stderr, "", log.LstdFlags)
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wg := sync.WaitGroup{}
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wg.Add(1)
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done := make(chan struct{})
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frame := make(chan []byte)
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go func(done chan struct{}) {
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buf := make([]byte, bufferSize)
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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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return
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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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wg.Done()
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return
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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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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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}
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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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}
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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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}
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return nil
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}
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