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oomparser.go
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oomparser.go
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package oomparser
import (
"path"
"regexp"
"strconv"
"time"
"github.com/euank/go-kmsg-parser/kmsgparser"
"k8s.io/klog/v2"
)
var (
legacyContainerRegexp = regexp.MustCompile(`Task in (.*) killed as a result of limit of (.*)`)
// Starting in 5.0 linux kernels, the OOM message changed
containerRegexp = regexp.MustCompile(`oom-kill:constraint=(.*),nodemask=(.*),cpuset=(.*),mems_allowed=(.*),oom_memcg=(.*),task_memcg=(.*),task=(.*),pid=(.*),uid=(.*)`)
lastLineRegexp = regexp.MustCompile(`Killed process ([0-9]+) \((.+)\)`)
firstLineRegexp = regexp.MustCompile(`invoked oom-killer:`)
)
// OomParser wraps a kmsgparser in order to extract OOM events from the
// individual kernel ring buffer messages.
type OomParser struct {
parser kmsgparser.Parser
}
// struct that contains information related to an OOM kill instance
type OomInstance struct {
// process id of the killed process
Pid int
// the name of the killed process
ProcessName string
// the time that the process was reported to be killed,
// accurate to the minute
TimeOfDeath time.Time
// the absolute name of the container that OOMed
ContainerName string
// the absolute name of the container that was killed
// due to the OOM.
VictimContainerName string
// the constraint that triggered the OOM. One of CONSTRAINT_NONE,
// CONSTRAINT_CPUSET, CONSTRAINT_MEMORY_POLICY, CONSTRAINT_MEMCG
Constraint string
}
// gets the container name from a line and adds it to the oomInstance.
func getLegacyContainerName(line string, currentOomInstance *OomInstance) error {
parsedLine := legacyContainerRegexp.FindStringSubmatch(line)
if parsedLine == nil {
return nil
}
currentOomInstance.ContainerName = path.Join("/", parsedLine[1])
currentOomInstance.VictimContainerName = path.Join("/", parsedLine[2])
return nil
}
// gets the container name from a line and adds it to the oomInstance.
func getContainerName(line string, currentOomInstance *OomInstance) (bool, error) {
parsedLine := containerRegexp.FindStringSubmatch(line)
if parsedLine == nil {
// Fall back to the legacy format if it isn't found here.
return false, getLegacyContainerName(line, currentOomInstance)
}
currentOomInstance.ContainerName = parsedLine[6]
currentOomInstance.VictimContainerName = parsedLine[5]
currentOomInstance.Constraint = parsedLine[1]
pid, err := strconv.Atoi(parsedLine[8])
if err != nil {
return false, err
}
currentOomInstance.Pid = pid
currentOomInstance.ProcessName = parsedLine[7]
return true, nil
}
// gets the pid, name, and date from a line and adds it to oomInstance
func getProcessNamePid(line string, currentOomInstance *OomInstance) (bool, error) {
reList := lastLineRegexp.FindStringSubmatch(line)
if reList == nil {
return false, nil
}
pid, err := strconv.Atoi(reList[1])
if err != nil {
return false, err
}
currentOomInstance.Pid = pid
currentOomInstance.ProcessName = reList[2]
return true, nil
}
// uses regex to see if line is the start of a kernel oom log
func checkIfStartOfOomMessages(line string) bool {
potentialOomStart := firstLineRegexp.MatchString(line)
return potentialOomStart
}
// StreamOoms writes to a provided a stream of OomInstance objects representing
// OOM events that are found in the logs.
// It will block and should be called from a goroutine.
func (p *OomParser) StreamOoms(outStream chan<- *OomInstance) {
kmsgEntries := p.parser.Parse()
defer p.parser.Close()
for msg := range kmsgEntries {
isOomMessage := checkIfStartOfOomMessages(msg.Message)
if isOomMessage {
oomCurrentInstance := &OomInstance{
ContainerName: "/",
VictimContainerName: "/",
TimeOfDeath: msg.Timestamp,
}
for msg := range kmsgEntries {
finished, err := getContainerName(msg.Message, oomCurrentInstance)
if err != nil {
klog.Errorf("%v", err)
}
if !finished {
finished, err = getProcessNamePid(msg.Message, oomCurrentInstance)
if err != nil {
klog.Errorf("%v", err)
}
}
if finished {
oomCurrentInstance.TimeOfDeath = msg.Timestamp
break
}
}
outStream <- oomCurrentInstance
}
}
// Should not happen
klog.Errorf("exiting analyzeLines. OOM events will not be reported.")
}
// initializes an OomParser object. Returns an OomParser object and an error.
func New() (*OomParser, error) {
parser, err := kmsgparser.NewParser()
if err != nil {
return nil, err
}
parser.SetLogger(glogAdapter{})
return &OomParser{parser: parser}, nil
}
type glogAdapter struct{}
var _ kmsgparser.Logger = glogAdapter{}
func (glogAdapter) Infof(format string, args ...interface{}) {
klog.V(4).Infof(format, args...)
}
func (glogAdapter) Warningf(format string, args ...interface{}) {
klog.V(2).Infof(format, args...)
}
func (glogAdapter) Errorf(format string, args ...interface{}) {
klog.Warningf(format, args...)
}