Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/audit/audit.go

@@ -0,0 +1,91 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package audit
+
+import (
+	"fmt"
+
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+type Audit struct {
+	logger *mlog.Logger
+
+	// OnQueueFull is called on an attempt to add an audit record to a full queue.
+	// Return true to drop record, or false to block until there is room in queue.
+	OnQueueFull func(qname string, maxQueueSize int) bool
+
+	// OnError is called when an error occurs while writing an audit record.
+	OnError func(err error)
+}
+
+func (a *Audit) Init(maxQueueSize int) {
+	a.logger, _ = mlog.NewLogger(
+		mlog.MaxQueueSize(maxQueueSize),
+		mlog.OnLoggerError(a.onLoggerError),
+		mlog.OnQueueFull(a.onQueueFull),
+		mlog.OnTargetQueueFull(a.onTargetQueueFull),
+	)
+}
+
+// LogRecord emits an audit record with complete info.
+func (a *Audit) LogRecord(level mlog.Level, rec Record) {
+	flds := []mlog.Field{
+		mlog.String(KeyEventName, rec.EventName),
+		mlog.String(KeyStatus, rec.Status),
+		mlog.Any(KeyActor, rec.Actor),
+		mlog.Any(KeyEvent, rec.EventData),
+		mlog.Any(KeyMeta, rec.Meta),
+		mlog.Any(KeyError, rec.Error),
+	}
+
+	a.logger.Log(level, "", flds...)
+}
+
+// Configure sets zero or more target to output audit logs to.
+func (a *Audit) Configure(cfg mlog.LoggerConfiguration) error {
+	return a.logger.ConfigureTargets(cfg, nil)
+}
+
+// Flush attempts to write all queued audit records to all targets.
+func (a *Audit) Flush() error {
+	err := a.logger.Flush()
+	if err != nil {
+		a.onLoggerError(err)
+	}
+	return err
+}
+
+// Shutdown cleanly stops the audit engine after making best efforts to flush all targets.
+func (a *Audit) Shutdown() error {
+	err := a.logger.Shutdown()
+	if err != nil {
+		a.onLoggerError(err)
+	}
+	return err
+}
+
+func (a *Audit) onQueueFull(rec *mlog.LogRec, maxQueueSize int) bool {
+	if a.OnQueueFull != nil {
+		return a.OnQueueFull("main", maxQueueSize)
+	}
+	mlog.Error("Audit logging queue full, dropping record.", mlog.Int("queueSize", maxQueueSize))
+	return true
+}
+
+func (a *Audit) onTargetQueueFull(target mlog.Target, rec *mlog.LogRec, maxQueueSize int) bool {
+	if a.OnQueueFull != nil {
+		return a.OnQueueFull(fmt.Sprintf("%v", target), maxQueueSize)
+	}
+	mlog.Error("Audit logging queue full for target, dropping record.", mlog.Any("target", target), mlog.Int("queueSize", maxQueueSize))
+	return true
+}
+
+func (a *Audit) onLoggerError(err error) {
+	if a.OnError != nil {
+		a.OnError(err)
+		return
+	}
+	mlog.Error("Auditing error", mlog.Err(err))
+}