/
taskmanager.go
216 lines (201 loc) · 5.37 KB
/
taskmanager.go
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package engine
import (
"errors"
"fmt"
"github.com/gofrs/uuid"
gctcommon "github.com/thrasher-corp/gocryptotrader/common"
)
var (
errTaskNotFound = errors.New("task not found")
errTaskAlreadyMonitored = errors.New("task already monitored")
errAlreadyRan = errors.New("task already ran")
errTaskHasNotRan = errors.New("task hasn't ran yet")
errTaskIsRunning = errors.New("task is already running")
errCannotClear = errors.New("cannot clear task")
)
// NewTaskManager creates a run manager to allow the backtester to manage multiple strategies
func NewTaskManager() *TaskManager {
return &TaskManager{}
}
// AddTask adds a run to the manager
func (r *TaskManager) AddTask(b *BackTest) error {
if r == nil {
return fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
if b == nil {
return fmt.Errorf("%w BackTest", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
for i := range r.tasks {
if r.tasks[i].Equal(b) {
return fmt.Errorf("%w %s %s", errTaskAlreadyMonitored, b.MetaData.ID, b.MetaData.Strategy)
}
}
err := b.SetupMetaData()
if err != nil {
return err
}
r.tasks = append(r.tasks, b)
return nil
}
// List details all strategy tasks
func (r *TaskManager) List() ([]*TaskSummary, error) {
if r == nil {
return nil, fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
resp := make([]*TaskSummary, len(r.tasks))
for i := range r.tasks {
sum, err := r.tasks[i].GenerateSummary()
if err != nil {
return nil, err
}
resp[i] = sum
}
return resp, nil
}
// GetSummary returns details about a completed strategy task
func (r *TaskManager) GetSummary(id uuid.UUID) (*TaskSummary, error) {
if r == nil {
return nil, fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
for i := range r.tasks {
if !r.tasks[i].MatchesID(id) {
continue
}
return r.tasks[i].GenerateSummary()
}
return nil, fmt.Errorf("%s %w", id, errTaskNotFound)
}
// StopTask stops a strategy task if enabled, this will run CloseAllPositions
func (r *TaskManager) StopTask(id uuid.UUID) error {
if r == nil {
return fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
for i := range r.tasks {
switch {
case !r.tasks[i].MatchesID(id):
continue
case r.tasks[i].IsRunning():
return r.tasks[i].Stop()
case r.tasks[i].HasRan():
return fmt.Errorf("%w %v", errAlreadyRan, id)
default:
return fmt.Errorf("%w %v", errTaskHasNotRan, id)
}
}
return fmt.Errorf("%s %w", id, errTaskNotFound)
}
// StopAllTasks stops all running strategies
func (r *TaskManager) StopAllTasks() ([]*TaskSummary, error) {
if r == nil {
return nil, fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
resp := make([]*TaskSummary, 0, len(r.tasks))
for i := range r.tasks {
if !r.tasks[i].IsRunning() {
continue
}
err := r.tasks[i].Stop()
if err != nil {
return nil, err
}
sum, err := r.tasks[i].GenerateSummary()
if err != nil {
return nil, err
}
resp = append(resp, sum)
}
return resp, nil
}
// StartTask executes a strategy if found
func (r *TaskManager) StartTask(id uuid.UUID) error {
if r == nil {
return fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
for i := range r.tasks {
switch {
case !r.tasks[i].MatchesID(id):
continue
case r.tasks[i].IsRunning():
return fmt.Errorf("%w %v", errTaskIsRunning, id)
case r.tasks[i].HasRan():
return fmt.Errorf("%w %v", errAlreadyRan, id)
default:
return r.tasks[i].ExecuteStrategy(false)
}
}
return fmt.Errorf("%s %w", id, errTaskNotFound)
}
// StartAllTasks executes all strategies
func (r *TaskManager) StartAllTasks() ([]uuid.UUID, error) {
if r == nil {
return nil, fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
executedRuns := make([]uuid.UUID, 0, len(r.tasks))
for i := range r.tasks {
if r.tasks[i].HasRan() {
continue
}
executedRuns = append(executedRuns, r.tasks[i].MetaData.ID)
err := r.tasks[i].ExecuteStrategy(false)
if err != nil {
return nil, err
}
}
return executedRuns, nil
}
// ClearTask removes a run from memory, but only if it is not running
func (r *TaskManager) ClearTask(id uuid.UUID) error {
if r == nil {
return fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
for i := range r.tasks {
if !r.tasks[i].MatchesID(id) {
continue
}
if r.tasks[i].IsRunning() {
return fmt.Errorf("%w %v, currently running. Stop it first", errCannotClear, r.tasks[i].MetaData.ID)
}
r.tasks = append(r.tasks[:i], r.tasks[i+1:]...)
return nil
}
return fmt.Errorf("%s %w", id, errTaskNotFound)
}
// ClearAllTasks removes all tasks from memory, but only if they are not running
func (r *TaskManager) ClearAllTasks() (clearedRuns, remainingRuns []*TaskSummary, err error) {
if r == nil {
return nil, nil, fmt.Errorf("%w TaskManager", gctcommon.ErrNilPointer)
}
r.m.Lock()
defer r.m.Unlock()
for i := 0; i < len(r.tasks); i++ {
var run *TaskSummary
run, err = r.tasks[i].GenerateSummary()
if err != nil {
return nil, nil, err
}
if r.tasks[i].IsRunning() {
remainingRuns = append(remainingRuns, run)
} else {
clearedRuns = append(clearedRuns, run)
r.tasks = append(r.tasks[:i], r.tasks[i+1:]...)
i--
}
}
return clearedRuns, remainingRuns, nil
}