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k6.go
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k6.go
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/*
*
* k6 - a next-generation load testing tool
* Copyright (C) 2016 Load Impact
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package k6
import (
"context"
"math/rand"
"strconv"
"sync/atomic"
"time"
"github.com/dop251/goja"
"github.com/loadimpact/k6/js/common"
"github.com/loadimpact/k6/lib"
"github.com/loadimpact/k6/lib/metrics"
"github.com/loadimpact/k6/stats"
"github.com/pkg/errors"
)
type K6 struct{}
// ErrGroupInInitContext is returned when group() are using in the init context
var ErrGroupInInitContext = common.NewInitContextError("Using group() in the init context is not supported")
// ErrCheckInInitContext is returned when check() are using in the init context
var ErrCheckInInitContext = common.NewInitContextError("Using check() in the init context is not supported")
func New() *K6 {
return &K6{}
}
func (*K6) Fail(msg string) (goja.Value, error) {
return goja.Undefined(), errors.New(msg)
}
func (*K6) Sleep(ctx context.Context, secs float64) {
timer := time.NewTimer(time.Duration(secs * float64(time.Second)))
select {
case <-timer.C:
case <-ctx.Done():
timer.Stop()
}
}
func (*K6) RandomSeed(ctx context.Context, seed int64) {
randSource := rand.New(rand.NewSource(seed)).Float64
rt := common.GetRuntime(ctx)
rt.SetRandSource(randSource)
}
func (*K6) Group(ctx context.Context, name string, fn goja.Callable) (goja.Value, error) {
state := lib.GetState(ctx)
if state == nil {
return nil, ErrGroupInInitContext
}
if fn == nil {
return nil, errors.New("group() requires a callback as a second argument")
}
g, err := state.Group.Group(name)
if err != nil {
return goja.Undefined(), err
}
old := state.Group
state.Group = g
defer func() { state.Group = old }()
startTime := time.Now()
ret, err := fn(goja.Undefined())
t := time.Now()
tags := state.Options.RunTags.CloneTags()
if state.Options.SystemTags["group"] {
tags["group"] = g.Path
}
if state.Options.SystemTags["vu"] {
tags["vu"] = strconv.FormatInt(state.Vu, 10)
}
if state.Options.SystemTags["iter"] {
tags["iter"] = strconv.FormatInt(state.Iteration, 10)
}
stats.PushIfNotCancelled(ctx, state.Samples, stats.Sample{
Time: t,
Metric: metrics.GroupDuration,
Tags: stats.IntoSampleTags(&tags),
Value: stats.D(t.Sub(startTime)),
})
return ret, err
}
func (*K6) Check(ctx context.Context, arg0, checks goja.Value, extras ...goja.Value) (bool, error) {
state := lib.GetState(ctx)
if state == nil {
return false, ErrCheckInInitContext
}
rt := common.GetRuntime(ctx)
t := time.Now()
// Prepare tags, make sure the `group` tag can't be overwritten.
commonTags := state.Options.RunTags.CloneTags()
if state.Options.SystemTags["group"] {
commonTags["group"] = state.Group.Path
}
if len(extras) > 0 {
obj := extras[0].ToObject(rt)
for _, k := range obj.Keys() {
commonTags[k] = obj.Get(k).String()
}
}
if state.Options.SystemTags["vu"] {
commonTags["vu"] = strconv.FormatInt(state.Vu, 10)
}
if state.Options.SystemTags["iter"] {
commonTags["iter"] = strconv.FormatInt(state.Iteration, 10)
}
succ := true
obj := checks.ToObject(rt)
for _, name := range obj.Keys() {
val := obj.Get(name)
tags := make(map[string]string, len(commonTags))
for k, v := range commonTags {
tags[k] = v
}
// Resolve the check record.
check, err := state.Group.Check(name)
if err != nil {
return false, err
}
if state.Options.SystemTags["check"] {
tags["check"] = check.Name
}
// Resolve callables into values.
fn, ok := goja.AssertFunction(val)
if ok {
tmpVal, err := fn(goja.Undefined(), arg0)
if err != nil {
return false, err
}
val = tmpVal
}
sampleTags := stats.IntoSampleTags(&tags)
// Emit! (But only if we have a valid context.)
select {
case <-ctx.Done():
default:
if val.ToBoolean() {
atomic.AddInt64(&check.Passes, 1)
stats.PushIfNotCancelled(ctx, state.Samples, stats.Sample{Time: t, Metric: metrics.Checks, Tags: sampleTags, Value: 1})
} else {
atomic.AddInt64(&check.Fails, 1)
stats.PushIfNotCancelled(ctx, state.Samples, stats.Sample{Time: t, Metric: metrics.Checks, Tags: sampleTags, Value: 0})
// A single failure makes the return value false.
succ = false
}
}
}
return succ, nil
}