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d9c1d79e30
Logger targets were not race protected against concurrent updates from for example `HTTPConsoleLoggerSys`. Restrict direct access to targets and make slices immutable so a returned slice can be processed safely without locks.
107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero 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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// This program 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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package logger
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import (
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"sync"
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"sync/atomic"
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)
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// Target is the entity that we will receive
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// a single log entry and Send it to the log target
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// e.g. Send the log to a http server
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type Target interface {
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String() string
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Endpoint() string
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Init() error
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Send(entry interface{}, errKind string) error
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}
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// swapMu must be held while reading slice info or swapping targets or auditTargets.
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var swapMu sync.Mutex
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// targets is the set of enabled loggers.
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// Must be immutable at all times.
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// Can be swapped to another while holding swapMu
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var targets = []Target{}
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var nTargets int32 // atomic count of len(targets)
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// Targets returns active targets.
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// Returned slice may not be modified in any way.
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func Targets() []Target {
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if atomic.LoadInt32(&nTargets) == 0 {
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// Lock free if none...
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return nil
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}
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swapMu.Lock()
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res := targets
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swapMu.Unlock()
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return res
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}
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// AuditTargets returns active audit targets.
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// Returned slice may not be modified in any way.
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func AuditTargets() []Target {
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if atomic.LoadInt32(&nAuditTargets) == 0 {
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// Lock free if none...
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return nil
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}
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swapMu.Lock()
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res := auditTargets
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swapMu.Unlock()
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return res
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}
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// auditTargets is the list of enabled audit loggers
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// Must be immutable at all times.
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// Can be swapped to another while holding swapMu
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var auditTargets = []Target{}
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var nAuditTargets int32 // atomic count of len(auditTargets)
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// AddAuditTarget adds a new audit logger target to the
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// list of enabled loggers
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func AddAuditTarget(t Target) error {
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if err := t.Init(); err != nil {
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return err
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}
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swapMu.Lock()
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updated := append(make([]Target, 0, len(auditTargets)+1), auditTargets...)
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updated = append(updated, t)
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auditTargets = updated
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atomic.StoreInt32(&nAuditTargets, int32(len(updated)))
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swapMu.Unlock()
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return nil
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}
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// AddTarget adds a new logger target to the
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// list of enabled loggers
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func AddTarget(t Target) error {
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if err := t.Init(); err != nil {
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return err
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}
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swapMu.Lock()
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updated := append(make([]Target, 0, len(targets)+1), targets...)
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updated = append(updated, t)
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targets = updated
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atomic.StoreInt32(&nTargets, int32(len(updated)))
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swapMu.Unlock()
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return nil
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}
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