mirror of
https://github.com/ProtonMail/proton-bridge.git
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a187747c7c
Handles all IMAP related tasks. Unlike the previous iteration, this new service automatically adds and removes users from Gluon by interfacing with server manager.
116 lines
3.0 KiB
Go
116 lines
3.0 KiB
Go
// Copyright (c) 2023 Proton AG
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//
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// This file is part of Proton Mail Bridge.
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//
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// Proton Mail 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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// Proton Mail 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 Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package imapservice
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import (
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"bytes"
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"context"
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"fmt"
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"github.com/ProtonMail/gluon/async"
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"github.com/ProtonMail/gluon/logging"
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"github.com/ProtonMail/go-proton-api"
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)
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type attachmentResult struct {
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attachment []byte
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err error
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}
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type attachmentJob struct {
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id string
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size int64
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result chan attachmentResult
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}
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type attachmentDownloader struct {
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workerCh chan attachmentJob
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cancel context.CancelFunc
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}
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func attachmentWorker(ctx context.Context, client APIClient, work <-chan attachmentJob) {
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for {
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select {
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case <-ctx.Done():
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return
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case job, ok := <-work:
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if !ok {
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return
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}
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var b bytes.Buffer
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b.Grow(int(job.size))
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err := client.GetAttachmentInto(ctx, job.id, &b)
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select {
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case <-ctx.Done():
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close(job.result)
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return
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case job.result <- attachmentResult{attachment: b.Bytes(), err: err}:
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close(job.result)
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}
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}
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}
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}
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func (s *syncJob) newAttachmentDownloader(ctx context.Context, client APIClient, workerCount int) *attachmentDownloader {
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workerCh := make(chan attachmentJob, (workerCount+2)*workerCount)
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ctx, cancel := context.WithCancel(ctx)
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for i := 0; i < workerCount; i++ {
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workerCh = make(chan attachmentJob)
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async.GoAnnotated(ctx, s.panicHandler, func(ctx context.Context) { attachmentWorker(ctx, client, workerCh) }, logging.Labels{
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"sync": fmt.Sprintf("att-downloader %v", i),
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})
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}
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return &attachmentDownloader{
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workerCh: workerCh,
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cancel: cancel,
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}
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}
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func (a *attachmentDownloader) getAttachments(ctx context.Context, attachments []proton.Attachment) ([][]byte, error) {
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resultChs := make([]chan attachmentResult, len(attachments))
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for i, id := range attachments {
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resultChs[i] = make(chan attachmentResult, 1)
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select {
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case a.workerCh <- attachmentJob{id: id.ID, result: resultChs[i], size: id.Size}:
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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}
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result := make([][]byte, len(attachments))
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var err error
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for i := 0; i < len(attachments); i++ {
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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case r := <-resultChs[i]:
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if r.err != nil {
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err = fmt.Errorf("failed to get attachment %v: %w", attachments[i], r.err)
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}
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result[i] = r.attachment
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}
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}
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return result, err
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}
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func (a *attachmentDownloader) close() {
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a.cancel()
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}
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