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// Copyright 2021 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package kmsg
import (
"fmt"
)
// Ref: https://www.kernel.org/doc/Documentation/ABI/testing/dev-kmsg
// The kmsg lines have prefix of the following format:
// | priority | sequence | monotonic timestamp | flag | message
// 6 , 339 , 5140900 , - ; NET: Registered protocol family 10
// 30 , 340 , 5690716 , - ; udevd[80]: starting version 181
// where the flag is not necessary for us, so we only parse the prefix
// for the first 3 fields: priority, sequence and timestamp
// the device to read kernel log from
const kmsgFile = "/dev/kmsg"
const severityMask = 0x07
const facilityMask = 0xf8
// Severity is part of the log priority
type Severity int
//revive:disable
const (
// From /usr/include/sys/syslog.h.
// These are the same on Linux, BSD, and OS X.
LOG_EMERG Severity = iota
LOG_ALERT
LOG_CRIT
LOG_ERR
LOG_WARNING
LOG_NOTICE
LOG_INFO
LOG_DEBUG
)
//revive:enable
// String implements the string interface
func (p Severity) String() string {
return []string{
"emerg", "alert", "crit", "err",
"warning", "notice", "info", "debug",
}[p]
}
// Facility is part of the log priority
type Facility int
//revive:disable
const (
// From /usr/include/sys/syslog.h.
// These are the same up to LOG_FTP on Linux, BSD, and OS X.
LOG_KERN Facility = iota << 3
LOG_USER
LOG_MAIL
LOG_DAEMON
LOG_AUTH
LOG_SYSLOG
LOG_LPR
LOG_NEWS
LOG_UUCP
LOG_CRON
LOG_AUTHPRIV
LOG_FTP
_ // unused
_ // unused
_ // unused
_ // unused
LOG_LOCAL0
LOG_LOCAL1
LOG_LOCAL2
LOG_LOCAL3
LOG_LOCAL4
LOG_LOCAL5
LOG_LOCAL6
LOG_LOCAL7
)
//revive:enable
// String implements the string interface
func (p Facility) String() string {
return []string{
"kern", "user", "mail", "daemon",
"auth", "syslog", "lpr", "news",
"uucp", "cron", "authpriv", "ftp",
"", "", "", "",
"local0", "local1", "local2", "local3",
"local4", "local5", "local6", "local7",
}[p]
}
func decodeSeverity(p int) Severity {
return Severity(p) & severityMask
}
func decodeFacility(p int) Facility {
return Facility(p) & facilityMask
}
// Msg is the type of kernel message
type Msg struct {
Severity Severity
Facility Facility
Sequence int // Sequence is the 64 bit message sequence number
Timestamp int // Timestamp is the monotonic timestamp in microseconds
Message string
}
// String implements the string interface
func (m *Msg) String() string {
return fmt.Sprintf("%s:%s: [%.6f] %s", m.Facility, m.Severity, float64(m.Timestamp)/1e6, m.Message)
}
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