聊聊dubbogo的metricsFilter

• Z时代
• 2024-01-10
• 分类：综合

序

本文主要研究一下dubbo-go的metricsFilter

metricsFilter

dubbo-go-v1.4.2/filter/filter_impl/metrics_filter.go

const (
	metricFilterName = "metrics"
)
var (
	metricFilterInstance filter.Filter
)
// must initialized before using the filter and after loading configuration
func init() {
	extension.SetFilter(metricFilterName, newMetricsFilter)
}
// metricFilter will calculate the invocation"s duration and the report to the reporters
// If you want to use this filter to collect the metrics,
// Adding this into your configuration file, like:
// filter: "metrics"
// metrics:
//   reporter:
//     - "your reporter" # here you should specify the reporter, for example "prometheus"
// more info please take a look at dubbo-samples projects
type metricsFilter struct {
	reporters []metrics.Reporter
}

• metricsFilter定义了reporters属性

newMetricsFilter

dubbo-go-v1.4.2/filter/filter_impl/metrics_filter.go

func newMetricsFilter() filter.Filter {
	if metricFilterInstance == nil {
		reporterNames := config.GetMetricConfig().Reporters
		reporters := make([]metrics.Reporter, 0, len(reporterNames))
		for _, name := range reporterNames {
			reporters = append(reporters, extension.GetMetricReporter(name))
		}
		metricFilterInstance = &metricsFilter{
			reporters: reporters,
		}
	}
	return metricFilterInstance
}

• newMetricsFilter方法在metricFilterInstance为null的时候会获取config.GetMetricConfig().Reporters，然后创建reporters及metricsFilter

Invoke

dubbo-go-v1.4.2/filter/filter_impl/metrics_filter.go

func (p *metricsFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result {
	start := time.Now()
	res := invoker.Invoke(ctx, invocation)
	end := time.Now()
	duration := end.Sub(start)
	go func() {
		for _, reporter := range p.reporters {
			reporter.Report(ctx, invoker, invocation, duration, res)
		}
	}()
	return res
}

• Invoke方法在invoker.Invoke(ctx, invocation)前后记录时间，最后算出duration，然异步遍历p.reporters，执行reporter.Report

OnResponse

dubbo-go-v1.4.2/filter/filter_impl/metrics_filter.go

func (p *metricsFilter) OnResponse(ctx context.Context, res protocol.Result, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result {
	return res
}

• OnResponse方法目前直接返回result

小结

metricsFilter的Invoke方法在invoker.Invoke(ctx, invocation)前后记录时间，最后算出duration，然异步遍历p.reporters，执行reporter.Report

doc

• metrics_filter

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