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162 lines
3.3 KiB
Go
162 lines
3.3 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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// Package serial provides a handler for the serial connection of the signer machine.
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package serial
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import (
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"context"
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"fmt"
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"sync"
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"github.com/sirupsen/logrus"
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"github.com/tarm/serial"
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"git.cacert.org/cacert-gosigner/internal/config"
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"git.cacert.org/cacert-gosigner/pkg/protocol"
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)
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type Handler struct {
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serverHandler protocol.ServerHandler
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framer protocol.Framer
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config *serial.Config
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port *serial.Port
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logger *logrus.Logger
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framesIn chan []byte
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framesOut chan []byte
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}
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func (h *Handler) setupConnection() error {
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s, err := serial.OpenPort(h.config)
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if err != nil {
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return fmt.Errorf("could not open serial port: %w", err)
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}
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h.port = s
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return nil
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}
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func (h *Handler) Close() error {
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err := h.port.Close()
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if err != nil {
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return fmt.Errorf("could not close serial port: %w", err)
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}
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return nil
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}
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func (h *Handler) Run(ctx context.Context) error {
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const componentCount = 3
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protocolErrors, framerErrors := make(chan error), make(chan error)
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subCtx, cancel := context.WithCancel(ctx)
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wg := sync.WaitGroup{}
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wg.Add(componentCount)
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defer func() {
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cancel()
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h.logger.Info("context canceled waiting for shutdown of components")
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wg.Wait()
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h.logger.Info("shutdown complete")
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}()
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go func() {
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defer wg.Done()
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err := h.framer.ReadFrames(subCtx, h.port, h.framesIn)
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h.logger.Info("frame reading stopped")
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select {
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case framerErrors <- err:
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case <-subCtx.Done():
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}
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}()
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go func() {
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defer wg.Done()
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err := h.framer.WriteFrames(subCtx, h.port, h.framesOut)
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h.logger.Info("frame writing stopped")
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select {
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case framerErrors <- err:
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case <-subCtx.Done():
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}
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}()
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go func() {
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defer wg.Done()
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serverProtocol := protocol.NewServer(h.serverHandler, h.framesIn, h.framesOut, h.logger)
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err := serverProtocol.Handle(subCtx)
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h.logger.Info("server protocol stopped")
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select {
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case protocolErrors <- err:
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case <-subCtx.Done():
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}
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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 := <-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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func New(
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cfg *config.Serial,
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logger *logrus.Logger,
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framer protocol.Framer,
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protocolHandler protocol.ServerHandler,
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) (*Handler, error) {
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h := &Handler{
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serverHandler: protocolHandler,
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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: framer,
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}
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h.config = &serial.Config{Name: cfg.Device, Baud: cfg.Baud, ReadTimeout: cfg.Timeout}
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err := h.setupConnection()
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if err != nil {
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return nil, err
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}
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return h, nil
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}
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