Jan Dittberner
9905d748d9
- let client simulator send some garbage bytes before starting real commands - handle EOF during reads
431 lines
9.2 KiB
Go
431 lines
9.2 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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"sync"
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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 protocolState int8
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const (
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cmdAnnounce protocolState = iota
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cmdData
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respAnnounce
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respData
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)
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var validTransitions = map[protocolState]protocolState{
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cmdAnnounce: cmdData,
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cmdData: respAnnounce,
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respAnnounce: respData,
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respData: cmdAnnounce,
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}
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var protocolStateNames = map[protocolState]string{
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cmdAnnounce: "CMD ANNOUNCE",
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cmdData: "CMD DATA",
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respAnnounce: "RESP ANNOUNCE",
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respData: "RESP DATA",
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}
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func (p protocolState) String() string {
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if name, ok := protocolStateNames[p]; ok {
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return name
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}
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return fmt.Sprintf("unknown %d", p)
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}
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type TestCommandGenerator struct {
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logger *logrus.Logger
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currentCommand *protocol.Command
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currentResponse *protocol.Response
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commands chan *protocol.Command
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lock sync.Mutex
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}
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func (g *TestCommandGenerator) CmdAnnouncement() ([]byte, error) {
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g.lock.Lock()
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defer g.lock.Unlock()
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g.currentCommand = <-g.commands
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announceData, err := msgpack.Marshal(g.currentCommand.Announce)
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if err != nil {
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return nil, fmt.Errorf("could not marshal command annoucement: %w", err)
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}
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g.logger.WithField("announcement", &g.currentCommand.Announce).Info("write command announcement")
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return announceData, nil
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}
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func (g *TestCommandGenerator) CmdData() ([]byte, error) {
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g.lock.Lock()
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defer g.lock.Unlock()
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cmdData, err := msgpack.Marshal(g.currentCommand.Command)
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if err != nil {
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return nil, fmt.Errorf("could not marshal command data: %w", err)
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}
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g.logger.WithField("command", &g.currentCommand.Command).Info("write command data")
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return cmdData, nil
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}
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func (g *TestCommandGenerator) HandleResponseAnnounce(frame []byte) error {
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g.lock.Lock()
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defer g.lock.Unlock()
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var ann messages.ResponseAnnounce
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if err := msgpack.Unmarshal(frame, &ann); err != nil {
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return fmt.Errorf("could not unmarshal response announcement")
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}
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g.logger.WithField("announcement", &ann).Info("received response announcement")
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g.currentResponse = &protocol.Response{Announce: &ann}
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return nil
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}
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func (g *TestCommandGenerator) HandleResponse(frame []byte) error {
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g.lock.Lock()
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defer g.lock.Unlock()
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switch g.currentResponse.Announce.Code {
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case messages.RespHealth:
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var response messages.HealthResponse
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if err := msgpack.Unmarshal(frame, &response); err != nil {
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return fmt.Errorf("unmarshal failed: %w", err)
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}
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g.currentResponse.Response = &response
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case messages.RespFetchCRL:
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var response messages.FetchCRLResponse
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if err := msgpack.Unmarshal(frame, &response); err != nil {
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return fmt.Errorf("unmarshal failed: %w", err)
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}
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g.currentResponse.Response = &response
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}
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g.logger.WithField(
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"command",
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g.currentCommand,
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).WithField(
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"response",
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g.currentResponse,
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).Info("handled health response")
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return nil
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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("stopping health check 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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protocolState protocolState
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logger *logrus.Logger
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lock sync.Mutex
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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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}
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func (c *clientSimulator) writeCmdAnnouncement() error {
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frame, err := c.commandGenerator.CmdAnnouncement()
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if err != nil {
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return fmt.Errorf("could not get command annoucement: %w", err)
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}
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c.logger.Trace("writing command announcement")
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c.framesOut <- frame
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if err := c.nextState(); err != nil {
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return err
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}
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return nil
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}
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func (c *clientSimulator) writeCommand() error {
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frame, err := c.commandGenerator.CmdData()
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if err != nil {
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return fmt.Errorf("could not get command data: %w", err)
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}
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c.logger.Trace("writing command data")
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c.framesOut <- frame
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if err := c.nextState(); err != nil {
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return err
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}
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return nil
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}
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const responseAnnounceTimeout = 30 * time.Second
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const responseDataTimeout = 2 * time.Second
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func (c *clientSimulator) handleResponseAnnounce() error {
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c.logger.Trace("waiting for response announce")
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select {
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case frame := <-c.framesIn:
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if frame == nil {
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return nil
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}
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if err := c.commandGenerator.HandleResponseAnnounce(frame); err != nil {
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return fmt.Errorf("response announce handling failed: %w", err)
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}
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if err := c.nextState(); err != nil {
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return err
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}
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case <-time.After(responseAnnounceTimeout):
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c.logger.Warn("response announce timeout expired")
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c.protocolState = cmdAnnounce
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return nil
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}
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return nil
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}
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func (c *clientSimulator) handleResponseData() error {
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c.logger.Trace("waiting for response data")
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select {
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case frame := <-c.framesIn:
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if frame == nil {
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return nil
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}
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if err := c.commandGenerator.HandleResponse(frame); err != nil {
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return fmt.Errorf("response handler failed: %w", err)
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}
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if err := c.nextState(); err != nil {
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return err
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}
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return nil
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case <-time.After(responseDataTimeout):
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c.logger.Warn("response data timeout expired")
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c.protocolState = cmdAnnounce
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return nil
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}
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}
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func (c *clientSimulator) Run(ctx context.Context) error {
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c.protocolState = cmdAnnounce
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errors := 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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errors <- 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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errors <- err
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}()
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go func() {
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err := c.commandGenerator.GenerateCommands(ctx)
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errors <- 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 := <-errors:
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if err != nil {
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return fmt.Errorf("error from handler loop: %w", err)
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}
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return nil
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default:
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if err := c.handleProtocolState(); err != nil {
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return err
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}
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}
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}
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}
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func (c *clientSimulator) handleProtocolState() error {
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c.logger.Tracef("handling protocol state %s", c.protocolState)
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c.lock.Lock()
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defer c.lock.Unlock()
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switch c.protocolState {
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case cmdAnnounce:
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if err := c.writeCmdAnnouncement(); err != nil {
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return err
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}
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case cmdData:
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if err := c.writeCommand(); err != nil {
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return err
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}
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case respAnnounce:
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if err := c.handleResponseAnnounce(); err != nil {
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return err
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}
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case respData:
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if err := c.handleResponseData(); err != nil {
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return err
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}
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default:
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return fmt.Errorf("unknown protocol state %s", c.protocolState)
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}
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return nil
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}
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func (c *clientSimulator) nextState() error {
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next, ok := validTransitions[c.protocolState]
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if !ok {
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return fmt.Errorf("illegal protocol state %s", c.protocolState)
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}
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c.protocolState = next
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return nil
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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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}
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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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