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本文次要钻研一下dubbo-go的TpsLimitFilter

TpsLimitFilter

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

const (    // TpsLimitFilterKey key    TpsLimitFilterKey = "tps")func init() {    extension.SetFilter(TpsLimitFilterKey, GetTpsLimitFilter)}type TpsLimitFilter struct {}
  • TpsLimitFilter的init设置了GetTpsLimitFilter

GetTpsLimitFilter

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

// GetTpsLimitFilter ...func GetTpsLimitFilter() filter.Filter {    return &TpsLimitFilter{}}
  • GetTpsLimitFilter实例化TpsLimitFilter

Invoke

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

// Invoke ...func (t TpsLimitFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result {    url := invoker.GetUrl()    tpsLimiter := url.GetParam(constant.TPS_LIMITER_KEY, "")    rejectedExeHandler := url.GetParam(constant.TPS_REJECTED_EXECUTION_HANDLER_KEY, constant.DEFAULT_KEY)    if len(tpsLimiter) > 0 {        allow := extension.GetTpsLimiter(tpsLimiter).IsAllowable(invoker.GetUrl(), invocation)        if allow {            return invoker.Invoke(ctx, invocation)        }        logger.Errorf("The invocation was rejected due to over the tps limitation, url: %s ", url.String())        return extension.GetRejectedExecutionHandler(rejectedExeHandler).RejectedExecution(url, invocation)    }    return invoker.Invoke(ctx, invocation)}
  • Invoke办法读取constant.TPS_LIMITER_KEY及constant.TPS_REJECTED_EXECUTION_HANDLER_KEY；对于有配置tpsLimiter的执行extension.GetTpsLimiter(tpsLimiter).IsAllowable(invoker.GetUrl(), invocation)，对于allow的执行invoker.Invoke(ctx, invocation)，非allow的执行extension.GetRejectedExecutionHandler(rejectedExeHandler).RejectedExecution(url, invocation)

OnResponse

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

// OnResponse ...func (t TpsLimitFilter) OnResponse(_ context.Context, result protocol.Result, _ protocol.Invoker,    _ protocol.Invocation) protocol.Result {    return result}
  • OnResponse目前不做任何操作

小结

TpsLimitFilter的Invoke办法读取constant.TPS_LIMITER_KEY及constant.TPS_REJECTED_EXECUTION_HANDLER_KEY；对于有配置tpsLimiter的执行extension.GetTpsLimiter(tpsLimiter).IsAllowable(invoker.GetUrl(), invocation)，对于allow的执行invoker.Invoke(ctx, invocation)，非allow的执行extension.GetRejectedExecutionHandler(rejectedExeHandler).RejectedExecution(url, invocation)

doc

  • tps_limit_filter