mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-10 04:36:43 +00:00
70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
// Copyright (c) 2022 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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//go:build !windows
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// +build !windows
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package store
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import (
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"runtime"
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"syscall"
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)
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func getCurrentFDLimit() (int, error) {
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var limits syscall.Rlimit
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err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limits)
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if err != nil {
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return 0, err
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}
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return int(limits.Cur), nil
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}
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func countOpenedFDs(limit int) int {
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openedFDs := 0
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for i := 0; i < limit; i++ {
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_, _, err := syscall.Syscall(syscall.SYS_FCNTL, uintptr(i), uintptr(syscall.F_GETFL), 0)
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if err == 0 {
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openedFDs++
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}
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}
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return openedFDs
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}
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func isFdCloseToULimit() bool {
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if runtime.GOOS != "darwin" && runtime.GOOS != "linux" {
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return false
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}
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limit, err := getCurrentFDLimit()
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if err != nil {
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log.WithError(err).Error("Cannot get current FD limit")
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return false
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}
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openedFDs := countOpenedFDs(limit)
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log.
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WithField("noGoroutines", runtime.NumCgoCall()).
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WithField("noFDs", openedFDs).
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WithField("limitFD", limit).
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Info("File descriptor check")
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return openedFDs >= int(0.95*float64(limit))
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}
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