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config.go
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config.go
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package model
import (
"context"
"fmt"
"log"
"sync"
"time"
"github.com/yurishkuro/microsim/tracing"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)
// Config is config.
type Config struct {
Services []*Service
TestName string
TestDuration time.Duration
TestRunners int
Repeats int
SleepBetweenRequests time.Duration
}
// Validate performs validation and sets defaults.
func (c *Config) Validate(r *Registry) error {
if len(c.Services) == 0 {
return fmt.Errorf("Config: must have at least one service")
}
for i, service := range c.Services {
if err := service.Validate(r); err != nil {
return fmt.Errorf("Config.Service[%d]: validation error: %v", i, err)
}
}
return nil
}
// Start starts the simulation.
func (c *Config) Start() error {
otel.SetTextMapPropagator(
propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
),
)
for i, service := range c.Services {
if err := service.Start(); err != nil {
return fmt.Errorf("Start to fail service %d - %s: %v", i, service.Name, err)
}
}
return nil
}
// Stop stops the simulation.
func (c *Config) Stop() {
for _, service := range c.Services {
service.Stop()
}
}
// Run runs the simulation.
func (c *Config) Run() {
stop := make(chan struct{})
done := &sync.WaitGroup{}
done.Add(c.TestRunners)
for i := 0; i < c.TestRunners; i++ {
name := fmt.Sprintf("test-executor-%d", i)
go c.runWorker(name, stop, done)
}
log.Printf("started %d test executors", c.TestRunners)
if c.Repeats > 0 {
log.Printf("running %d repeat(s)", c.Repeats)
} else {
log.Printf("running for %v", c.TestDuration)
time.Sleep(c.TestDuration)
log.Printf("stopping test executors")
close(stop)
}
log.Printf("waiting for test executors to exit")
done.Wait()
}
func (c *Config) runWorker(instanceName string, stop chan struct{}, done *sync.WaitGroup) {
tracerProvider, shutdown, err := tracing.InitTracer("test-executor", instanceName)
if err != nil {
log.Fatalf("failed to create a tracer: %v", err)
}
defer shutdown()
defer done.Done()
repeats := c.Repeats
for {
select {
case <-stop:
return
default:
c.runTest(tracerProvider)
time.Sleep(c.SleepBetweenRequests)
}
if repeats > 0 {
repeats--
if repeats == 0 {
break
}
}
}
}
func (c *Config) runTest(tracerProvider trace.TracerProvider) {
rootSvc := c.Services[0]
inst := rootSvc.instances[0]
endpoint := inst.Endpoints[0]
tracer := tracerProvider.Tracer("worker")
ctx, rootSpan := tracer.Start(
context.Background(),
"runTest",
trace.WithAttributes(attribute.String("test_name", c.TestName)),
)
defer rootSpan.End()
err := endpoint.Call(ctx, tracerProvider)
if err != nil {
rootSpan.RecordError(err)
rootSpan.SetStatus(codes.Error, err.Error())
}
}