302 lines
7 KiB
Go
302 lines
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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"context"
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"crypto/rand"
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"fmt"
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"io"
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"os"
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"time"
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"github.com/shamaton/msgpackgen/msgpack"
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"github.com/sirupsen/logrus"
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"git.cacert.org/cacert-gosigner/pkg/protocol"
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"git.cacert.org/cacert-gosigner/pkg/messages"
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)
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type TestCommandGenerator struct {
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logger *logrus.Logger
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commands chan *protocol.Command
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}
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func (g *TestCommandGenerator) GenerateCommands(ctx context.Context) error {
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var (
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announce *messages.CommandAnnounce
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err error
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)
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// write some leading garbage to test signer robustness
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_, _ = io.CopyN(os.Stdout, rand.Reader, 50) //nolint:gomnd
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announce, err = messages.BuildCommandAnnounce(messages.CmdHealth)
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if err != nil {
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return fmt.Errorf("build command announce failed: %w", err)
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}
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g.commands <- &protocol.Command{Announce: announce, Command: &messages.HealthCommand{}}
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const (
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healthInterval = 5 * time.Second
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crlInterval = 15 * time.Minute
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startPause = 3 * time.Second
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)
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g.logger.Info("start generating commands")
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time.Sleep(startPause)
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announce, err = messages.BuildCommandAnnounce(messages.CmdFetchCRL)
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if err != nil {
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return fmt.Errorf("build command announce failed: %w", err)
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}
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g.commands <- &protocol.Command{
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Announce: announce,
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Command: &messages.FetchCRLCommand{IssuerID: "sub-ecc_person_2022"},
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}
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healthTimer := time.NewTimer(healthInterval)
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crlTimer := time.NewTimer(crlInterval)
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for {
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select {
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case <-ctx.Done():
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_ = healthTimer.Stop()
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g.logger.Info("stopped health check loop")
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_ = crlTimer.Stop()
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g.logger.Info("stopped CRL fetch loop")
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return nil
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case <-healthTimer.C:
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announce, err = messages.BuildCommandAnnounce(messages.CmdHealth)
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if err != nil {
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return fmt.Errorf("build command announce failed: %w", err)
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}
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g.commands <- &protocol.Command{
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Announce: announce,
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Command: &messages.HealthCommand{},
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}
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healthTimer.Reset(healthInterval)
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case <-crlTimer.C:
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g.commands <- &protocol.Command{
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Announce: announce,
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Command: &messages.FetchCRLCommand{IssuerID: "sub-ecc_person_2022"},
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}
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}
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}
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}
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type clientSimulator struct {
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clientHandler protocol.ClientHandler
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framesIn chan []byte
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framesOut chan []byte
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framer protocol.Framer
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commandGenerator *TestCommandGenerator
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logger *logrus.Logger
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}
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const (
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responseAnnounceTimeout = 30 * time.Second
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responseDataTimeout = 2 * time.Second
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)
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func (c *clientSimulator) Run(ctx context.Context) error {
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framerErrors := make(chan error)
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protocolErrors := make(chan error)
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generatorErrors := make(chan error)
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go func() {
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err := c.framer.ReadFrames(os.Stdin, c.framesIn)
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framerErrors <- err
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}()
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go func() {
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err := c.framer.WriteFrames(os.Stdout, c.framesOut)
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framerErrors <- err
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}()
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go func() {
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clientProtocol := protocol.NewClient(c.clientHandler, c.commandGenerator.commands, c.framesIn, c.framesOut, c.logger)
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err := clientProtocol.Handle()
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protocolErrors <- err
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}()
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go func() {
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err := c.commandGenerator.GenerateCommands(ctx)
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generatorErrors <- err
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}()
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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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case err := <-framerErrors:
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if err != nil {
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return fmt.Errorf("error from framer: %w", err)
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}
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return nil
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case err := <-generatorErrors:
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if err != nil {
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return fmt.Errorf("error from command generator: %w", err)
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}
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return nil
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case err := <-protocolErrors:
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if err != nil {
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return fmt.Errorf("error from protocol handler: %w", err)
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}
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return nil
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}
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}
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}
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type ClientHandler struct {
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logger *logrus.Logger
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}
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func (c *ClientHandler) Send(command *protocol.Command, out chan []byte) error {
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var (
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frame []byte
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err error
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)
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frame, err = msgpack.Marshal(command.Announce)
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if err != nil {
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return fmt.Errorf("could not marshal command annoucement: %w", err)
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}
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c.logger.WithField("announcement", command.Announce).Info("write command announcement")
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c.logger.Trace("writing command announcement")
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out <- frame
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frame, err = msgpack.Marshal(command.Command)
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if err != nil {
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return fmt.Errorf("could not marshal command data: %w", err)
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}
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c.logger.WithField("command", command.Command).Info("write command data")
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out <- frame
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return nil
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}
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func (c *ClientHandler) ResponseAnnounce(in chan []byte) (*protocol.Response, error) {
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response := &protocol.Response{}
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var announce messages.ResponseAnnounce
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select {
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case frame := <-in:
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if err := msgpack.Unmarshal(frame, &announce); err != nil {
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return nil, fmt.Errorf("could not unmarshal response announcement: %w", err)
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}
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response.Announce = &announce
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c.logger.WithField("announcement", response.Announce).Debug("received response announcement")
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return response, nil
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case <-time.After(responseAnnounceTimeout):
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return nil, protocol.ErrResponseAnnounceTimeoutExpired
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}
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}
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func (c *ClientHandler) ResponseData(in chan []byte, response *protocol.Response) error {
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select {
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case frame := <-in:
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switch response.Announce.Code {
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case messages.RespHealth:
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var resp messages.HealthResponse
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if err := msgpack.Unmarshal(frame, &resp); err != nil {
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return fmt.Errorf("could not unmarshal health response data: %w", err)
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}
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response.Response = &resp
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case messages.RespFetchCRL:
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var resp messages.FetchCRLResponse
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if err := msgpack.Unmarshal(frame, &resp); err != nil {
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return fmt.Errorf("could not unmarshal fetch CRL response data: %w", err)
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}
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response.Response = &resp
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default:
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return fmt.Errorf("unhandled response code %s", response.Announce.Code)
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}
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case <-time.After(responseDataTimeout):
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return protocol.ErrResponseDataTimeoutExpired
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}
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return nil
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}
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func (c *ClientHandler) HandleResponse(response *protocol.Response) error {
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c.logger.WithField("response", response.Announce).Info("handled response")
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c.logger.WithField("response", response).Debug("full response")
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return nil
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}
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func newClientHandler(logger *logrus.Logger) *ClientHandler {
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return &ClientHandler{logger: logger}
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}
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func main() {
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logger := logrus.New()
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logger.SetOutput(os.Stderr)
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logger.SetLevel(logrus.DebugLevel)
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messages.RegisterGeneratedResolver()
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sim := &clientSimulator{
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commandGenerator: &TestCommandGenerator{
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logger: logger,
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commands: make(chan *protocol.Command),
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},
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logger: logger,
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framesIn: make(chan []byte),
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framesOut: make(chan []byte),
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framer: protocol.NewCOBSFramer(logger),
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clientHandler: newClientHandler(logger),
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}
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err := sim.Run(context.Background())
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if err != nil {
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logger.WithError(err).Error("simulator returned an error")
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}
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}
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