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scheduler.go
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scheduler.go
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package lib
import (
"encoding/json"
"fmt"
"strconv"
"time"
)
type RunId struct {
RunId int
}
func (runId *RunId) UnmarshalJSON(b []byte) error {
var i int
if err := json.Unmarshal(b, &i); err != nil {
return err
}
runId.RunId = i
return nil
}
func (runId RunId) MarshalJSON() ([]byte, error) {
return []byte(strconv.Itoa(runId.RunId)), nil
}
type QueueSize struct {
QueueSize int `json:"queue-size"`
}
type Seed int
func LoadTest(testId TestId) QueueSize {
var queueSize QueueSize
PostParse("load-test!", struct {
TestId TestId `json:"test-id"`
}{testId}, &queueSize)
return queueSize
}
func RegisterExecutor(executorId string, components []string) {
Post("register-executor!", struct {
ExecutorId string `json:"executor-id"`
Components []string `json:"components"`
}{
ExecutorId: executorId,
Components: components,
})
}
type SchedulerFault struct {
Kind string `json:"kind"`
From string `json:"from"`
To string `json:"to"`
At int `json:"at"` // should be time.Time?
}
func toSchedulerFaults(faults Faults) []SchedulerFault {
schedulerFaults := make([]SchedulerFault, 0, len(faults.Faults))
for _, fault := range faults.Faults {
var schedulerFault SchedulerFault
switch ev := fault.Args.(type) {
case Omission:
schedulerFault.Kind = fault.Kind
schedulerFault.From = ev.From
schedulerFault.To = ev.To
schedulerFault.At = ev.At // convert?
case Crash:
schedulerFault.Kind = fault.Kind
schedulerFault.From = ev.From
schedulerFault.To = "" // Not used.
schedulerFault.At = ev.At // convert?
default:
panic(fmt.Sprintf("Unknown fault type: %#v\n", fault))
}
schedulerFaults = append(schedulerFaults, schedulerFault)
}
return schedulerFaults
}
type CreateRunEvent struct {
Seed Seed
Faults Faults
TickFrequency float64
MinTimeNs time.Duration
MaxTimeNs time.Duration
}
func CreateRun(testId TestId, event CreateRunEvent) RunId {
var runId struct {
RunId RunId `json:"run-id"`
}
PostParse("create-run!", struct {
TestId TestId `json:"test-id"`
Seed Seed `json:"seed"`
Faults []SchedulerFault `json:"faults"`
TickFrequency float64 `json:"tick-frequency"`
MinTimeNs time.Duration `json:"min-time-ns"`
MaxTimeNs time.Duration `json:"max-time-ns"`
}{testId, event.Seed, toSchedulerFaults(event.Faults), event.TickFrequency, event.MinTimeNs, event.MaxTimeNs}, &runId)
return runId.RunId
}
func Run() {
Post("run!", struct{}{})
}
func Status() map[string]interface{} {
var status map[string]interface{}
PostParse("status", struct{}{}, &status)
return status
}
func Reset() {
Post("reset", struct{}{})
}
func Step() json.RawMessage {
var result json.RawMessage
PostParse("step!", struct{}{}, &result)
return result
}
func reactorsFromDeployment(testId TestId) ([]string, error) {
deploys, err := DeploymentInfoForTest(testId)
if err != nil {
return nil, err
}
reactors := make([]string, 0, len(deploys))
for _, dep := range deploys {
reactors = append(reactors, dep.Reactor)
}
return reactors, nil
}
func Register(testId TestId) {
// TODO(stevan): Make executorUrl part of topology/deployment.
const executorUrl string = "http://localhost:3001/api/v1/"
reactors, err := reactorsFromDeployment(testId)
if err != nil {
panic(err)
}
RegisterExecutor(executorUrl, reactors)
}