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constant_rate.go
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constant_rate.go
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package constant
import (
"fmt"
"time"
"github.com/spf13/pflag"
"github.com/form3tech-oss/f1/v2/internal/trigger/api"
"github.com/form3tech-oss/f1/v2/internal/trigger/rate"
)
func ConstantRate() api.Builder {
flags := pflag.NewFlagSet("constant", pflag.ContinueOnError)
flags.StringP("rate", "r", "1/s", "number of iterations to start per interval, in the form <request>/<duration>")
flags.Float64P("jitter", "j", 0.0, "vary the rate randomly by up to jitter percent")
flags.String("distribution", "regular", "optional parameter to distribute the rate over steps of 100ms, which can be none|regular|random")
return api.Builder{
Name: "constant <scenario>",
Description: "triggers test iterations at a constant rate",
Flags: flags,
New: func(params *pflag.FlagSet) (*api.Trigger, error) {
rateArg, err := params.GetString("rate")
if err != nil {
return nil, err
}
jitterArg, err := params.GetFloat64("jitter")
if err != nil {
return nil, err
}
distributionTypeArg, err := params.GetString("distribution")
if err != nil {
return nil, err
}
rates, err := CalculateConstantRate(jitterArg, rateArg, distributionTypeArg)
if err != nil {
return nil, err
}
return &api.Trigger{
Trigger: api.NewIterationWorker(rates.IterationDuration, rates.Rate),
Description: fmt.Sprintf("%s constant rate, using distribution %s", rateArg, distributionTypeArg),
DryRun: rates.Rate,
},
nil
},
}
}
func CalculateConstantRate(jitterArg float64, rateArg, distributionTypeArg string) (*api.Rates, error) {
rate, iterationDuration, err := rate.ParseRate(rateArg)
if err != nil {
return nil, fmt.Errorf("unable to parse rate %s: %w", rateArg, err)
}
rateFn := api.WithJitter(func(time.Time) int { return rate }, jitterArg)
distributedIterationDuration, distributedRateFn, err := api.NewDistribution(distributionTypeArg, iterationDuration, rateFn)
if err != nil {
return nil, err
}
return &api.Rates{
IterationDuration: distributedIterationDuration,
Rate: distributedRateFn,
}, nil
}