forked from Silverfish/proton-bridge
90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// Copyright (c) 2021 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ProtonMail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package message
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import (
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"sync"
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"github.com/pkg/errors"
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)
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type buildRes struct {
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messageID string
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literal []byte
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err error
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}
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func newBuildResSuccess(messageID string, literal []byte) buildRes {
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return buildRes{
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messageID: messageID,
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literal: literal,
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}
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}
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func newBuildResFailure(messageID string, err error) buildRes {
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return buildRes{
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messageID: messageID,
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err: err,
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}
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}
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// startBuildWorkers starts the given number of build workers.
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// These workers decrypt and build messages into RFC822 literals.
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// Two channels are returned:
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// - buildReqCh: used to send work items to the worker pool
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// - buildResCh: used to receive work results from the worker pool
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func startBuildWorkers(buildWorkers int) (chan fetchRes, chan buildRes) {
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buildReqCh := make(chan fetchRes)
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buildResCh := make(chan buildRes)
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go func() {
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defer close(buildResCh)
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var wg sync.WaitGroup
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wg.Add(buildWorkers)
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for workerID := 0; workerID < buildWorkers; workerID++ {
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go buildWorker(buildReqCh, buildResCh, &wg)
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}
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wg.Wait()
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}()
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return buildReqCh, buildResCh
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}
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func buildWorker(buildReqCh <-chan fetchRes, buildResCh chan<- buildRes, wg *sync.WaitGroup) {
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defer wg.Done()
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for req := range buildReqCh {
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l := log.
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WithField("addrID", req.msg.AddressID).
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WithField("msgID", req.msg.ID)
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if kr, err := req.api.KeyRingForAddressID(req.msg.AddressID); err != nil {
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l.WithError(err).Warn("Cannot find keyring for address")
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buildResCh <- newBuildResFailure(req.msg.ID, errors.Wrap(ErrNoSuchKeyRing, err.Error()))
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} else if literal, err := buildRFC822(kr, req.msg, req.atts, req.opts); err != nil {
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l.WithError(err).Warn("Build failed")
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buildResCh <- newBuildResFailure(req.msg.ID, err)
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} else {
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buildResCh <- newBuildResSuccess(req.msg.ID, literal)
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}
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}
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}
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