夜莺初探四·mtail插件采集日志指标
前言
上一篇介绍了Categraf的配置，这篇我们尝试通过使用google开源的mtail工具来作为Categraf的插件，从应用日志中提取指标数据。
mtail项目介绍和配置文件说明
通过mtail -h可以很方便看到参数详细，也推荐乔克-从日志中提取指标的瑞士军刀或者Dream运维梦工厂-categraf-mtail日志收集插件详解来了解更多,我就不再班门弄斧了。
当然也可以通过官方来了解详情新手村介绍 和高手入门
Categraf采集插件
categraf-mtail插件地址
https://github.com/flashcatcloud/categraf/tree/main/inputs/mtail
源码解读
package mtail
...
//常量值
const inputName = `mtail`
const description = ` extract internal monitoring data from application logs`
//配置
// MTail holds the configuration for the plugin.
type MTail struct {
config.PluginConfig
Instances []*Instance `toml:"instances"`
}
//配置文件中instances对象需要参数结构体
type Instance struct {
config.InstanceConfig
/**
type InternalConfig struct {
// append labels
Labels map[string]string `toml:"labels"`
// metrics drop and pass filter
MetricsDrop []string `toml:"metrics_drop"`
MetricsPass []string `toml:"metrics_pass"`
MetricsDropFilter filter.Filter
MetricsPassFilter filter.Filter
// metric name prefix
MetricsNamePrefix string `toml:"metrics_name_prefix"`
// mapping value
ProcessorEnum []*ProcessorEnum `toml:"processor_enum"`
// whether instance initial success
inited bool `toml:"-"`
}
type InstanceConfig struct {
InternalConfig
IntervalTimes int64 `toml:"interval_times"`
}
**/
NamePrefix string `toml:"name_prefix"`
Progs string `toml:"progs"` //规则文件（xxx.mtail）的目录
Logs []string `toml:"logs"` //要监控的日志文件
IgnoreFileRegPattern string `toml:"ignore_filename_regex_pattern"`
OverrideTimeZone string `toml:"override_timezone"` //指定时区
EmitProgLabel string `toml:"emit_prog_label"` //是否导出label标签 string类型的bool值
emitProgLabel bool `toml:"-"`
EmitMetricTimestamp string `toml:"emit_metric_timestamp"` //metrics是否带时间戳 string类型的bool值
emitMetricTimestamp bool `toml:"-"`
PollInterval time.Duration `toml:"poll_interval"`
PollLogInterval time.Duration `toml:"poll_log_interval"`
MetricPushInterval time.Duration `toml:"metric_push_interval"`
MaxRegexpLen int `toml:"max_regexp_length"`
MaxRecursionDepth int `toml:"max_recursion_depth"`
SyslogUseCurrentYear string `toml:"syslog_use_current_year"` // true
sysLogUseCurrentYear bool `toml:"-"`
LogRuntimeErrors string `toml:"vm_logs_runtime_errors"` // true
logRuntimeErrors bool `toml:"-"`
//
ctx context.Context `toml:"-"`
cancel context.CancelFunc `toml:"-"`
m *mtail.Server
}
//配置文件中instances对象的Init函数，调用mtail
func (ins *Instance) Init() error {
//初始化检查，设置默认值
if len(ins.Progs) == 0 || len(ins.Logs) == 0 {
return types.ErrInstancesEmpty
}
// set default value
ins.sysLogUseCurrentYear = ins.SyslogUseCurrentYear == "true"
ins.logRuntimeErrors = ins.LogRuntimeErrors == "true"
ins.emitProgLabel = ins.EmitProgLabel == "true"
ins.emitMetricTimestamp = ins.EmitMetricTimestamp == "true"
if ins.PollLogInterval == 0 {
ins.PollLogInterval = 250 * time.Millisecond
}
if ins.PollInterval == 0 {
ins.PollInterval = 250 * time.Millisecond
}
if ins.MetricPushInterval == 0 {
ins.MetricPushInterval = 1 * time.Minute
}
if ins.MaxRegexpLen == 0 {
ins.MaxRegexpLen = 1024
}
if ins.MaxRecursionDepth == 0 {
ins.MaxRecursionDepth = 100
}
buildInfo := mtail.BuildInfo{
Version: config.Version,
}
//时区设置
loc, err := time.LoadLocation(ins.OverrideTimeZone)
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't parse timezone %q: %s", ins.OverrideTimeZone, err)
return err
}
//mtail参数设置
opts := []mtail.Option{
mtail.ProgramPath(ins.Progs),
mtail.LogPathPatterns(ins.Logs...),
mtail.IgnoreRegexPattern(ins.IgnoreFileRegPattern),
mtail.SetBuildInfo(buildInfo),
mtail.OverrideLocation(loc),
mtail.MetricPushInterval(ins.MetricPushInterval), // keep it here ?
mtail.MaxRegexpLength(ins.MaxRegexpLen),
mtail.MaxRecursionDepth(ins.MaxRecursionDepth),
mtail.LogRuntimeErrors,
}
if ins.cancel != nil {
ins.cancel()
} else {
ins.ctx, ins.cancel = context.WithCancel(context.Background()) //父级ctx
}
//mtail配置，每隔1h启动 清理过期日志
staleLogGcWaker := waker.NewTimed(ins.ctx, time.Hour)
opts = append(opts, mtail.StaleLogGcWaker(staleLogGcWaker))
if ins.PollInterval > 0 {
logStreamPollWaker := waker.NewTimed(ins.ctx, ins.PollInterval)
logPatternPollWaker := waker.NewTimed(ins.ctx, ins.PollLogInterval)
opts = append(opts, mtail.LogPatternPollWaker(logPatternPollWaker), mtail.LogstreamPollWaker(logStreamPollWaker))
}
if ins.sysLogUseCurrentYear {
opts = append(opts, mtail.SyslogUseCurrentYear)
}
if !ins.emitProgLabel {
opts = append(opts, mtail.OmitProgLabel)
}
if ins.emitMetricTimestamp {
opts = append(opts, mtail.EmitMetricTimestamp)
}
//指标结果存储对象
store := metrics.NewStore()
//间隔1h清理历史指标
store.StartGcLoop(ins.ctx, time.Hour)
m, err := mtail.New(ins.ctx, store, opts...)
if err != nil {
log.Println(err)
ins.cancel()
return err
}
ins.m = m
return nil
}
//销毁取消所有任务
func (ins *Instance) Drop() {
ins.cancel()
}
//对象初始化方法
func init() {
inputs.Add(inputName, func() inputs.Input {
return &MTail{}
})
}
//对象复制返回新建对象
func (s *MTail) Clone() inputs.Input {
return &MTail{}
}
func (s *MTail) Name() string {
return inputName
}
//MTail获取配置文件中所有instances
func (s *MTail) GetInstances() []inputs.Instance {
ret := make([]inputs.Instance, len(s.Instances))
for i := 0; i < len(s.Instances); i++ {
ret[i] = s.Instances[i]
}
return ret
}
// Description returns a one-sentence description on the input.
func (s *MTail) Description() string {
return description
}
//抓取数据方法？
// Gather retrieves all the configured fields and tables.
// Any error encountered does not halt the process. The errors are accumulated
// and returned at the end.
// func (s *Instance) Gather(acc telegraf.Accumulator) error {
func (ins *Instance) Gather(slist *types.SampleList) {
//获取到prometheus注册器
reg := ins.m.GetRegistry()
mfs, done, err := prometheus.ToTransactionalGatherer(reg).Gather()
if err != nil {
log.Println(err)
return
}
defer done()
//遍历所有指标向量？
for _, mf := range mfs {
metricName := mf.GetName()
//遍历所有指标
for _, m := range mf.Metric {
//加入配置的Lables
tags := util.MakeLabels(m, ins.GetLabels())
//处理不同指标类型
if mf.GetType() == dto.MetricType_SUMMARY {
util.HandleSummary(inputName, m, tags, metricName, ins.GetLogMetricTime, slist)
} else if mf.GetType() == dto.MetricType_HISTOGRAM {
util.HandleHistogram(inputName, m, tags, metricName, ins.GetLogMetricTime, slist)
} else {
util.HandleGaugeCounter(inputName, m, tags, metricName, ins.GetLogMetricTime, slist)
}
}
}
}
//返回时间戳
func (p *Instance) GetLogMetricTime(ts int64) time.Time {
var tm time.Time
if ts <= 0 || !p.emitMetricTimestamp {
return tm
}
sec := ts / 1000
ms := ts % 1000 * 1e6
tm = time.Unix(sec, ms)
return tm
}
整体理解下来，Categraf有效的通过统一的文件完成了多个目录，多个规则的日志采集，简化许多操作。
最后感谢看完,由于作者水平有限,使用很多工具并不熟悉,如有错误和遗漏欢迎指出,感谢谅解。
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