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service.go
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service.go
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package handler
import (
"github.com/apex/log"
config2 "github.com/crawlab-team/crawlab-core/config"
"github.com/crawlab-team/crawlab-core/constants"
"github.com/crawlab-team/crawlab-core/errors"
"github.com/crawlab-team/crawlab-core/interfaces"
"github.com/crawlab-team/crawlab-core/models/client"
"github.com/crawlab-team/crawlab-core/models/delegate"
"github.com/crawlab-team/crawlab-core/models/service"
"github.com/crawlab-team/crawlab-core/node/config"
"github.com/crawlab-team/crawlab-core/task"
"github.com/crawlab-team/go-trace"
"github.com/spf13/viper"
"go.mongodb.org/mongo-driver/bson/primitive"
"go.mongodb.org/mongo-driver/mongo"
"go.uber.org/dig"
"sync"
"time"
)
type Service struct {
// dependencies
interfaces.TaskBaseService
cfgSvc interfaces.NodeConfigService
modelSvc service.ModelService
clientModelSvc interfaces.GrpcClientModelService
clientModelNodeSvc interfaces.GrpcClientModelNodeService
clientModelSpiderSvc interfaces.GrpcClientModelSpiderService
clientModelTaskSvc interfaces.GrpcClientModelTaskService
clientModelTaskStatSvc interfaces.GrpcClientModelTaskStatService
// settings
//maxRunners int
exitWatchDuration time.Duration
reportInterval time.Duration
// internals variables
stopped bool
mu sync.Mutex
runners sync.Map // pool of task runners started
syncLocks sync.Map // files sync locks map of task runners
}
func (svc *Service) Start() {
go svc.ReportStatus()
}
func (svc *Service) Run(taskId primitive.ObjectID) (err error) {
// current node
n, err := svc.GetCurrentNode()
if err != nil {
return err
}
// validate if there are available runners
if svc.getRunnerCount() >= n.GetMaxRunners() {
return trace.TraceError(errors.ErrorTaskNoAvailableRunners)
}
// attempt to get runner from pool
_, ok := svc.runners.Load(taskId)
if ok {
return trace.TraceError(errors.ErrorTaskAlreadyExists)
}
// create a new task runner
r, err := NewTaskRunner(taskId, svc)
if err != nil {
return err
}
// add runner to pool
svc.addRunner(taskId, r)
// create a goroutine to run task
go func() {
// run task process (blocking)
// error or finish after task runner ends
if err := r.Run(); err != nil {
switch err {
case constants.ErrTaskError:
log.Errorf("task[%s] finished with error: %v", r.GetTaskId().Hex(), err)
case constants.ErrTaskCancelled:
log.Errorf("task[%s] cancelled", r.GetTaskId().Hex())
default:
log.Errorf("task[%s] finished with unknown error: %v", r.GetTaskId().Hex(), err)
}
// delete runner from pool
svc.deleteRunner(r.GetTaskId())
}
log.Infof("task[%s] finished", r.GetTaskId().Hex())
// delete runner from pool
svc.deleteRunner(r.GetTaskId())
}()
return nil
}
func (svc *Service) Reset() {
svc.mu.Lock()
defer svc.mu.Unlock()
}
func (svc *Service) Cancel(taskId primitive.ObjectID) (err error) {
r, err := svc.getRunner(taskId)
if err != nil {
return err
}
if err := r.Cancel(); err != nil {
return err
}
return nil
}
func (svc *Service) ReportStatus() {
for {
if svc.stopped {
return
}
// report handler status
if err := svc.reportStatus(); err != nil {
trace.PrintError(err)
}
// wait
time.Sleep(svc.reportInterval)
}
}
func (svc *Service) IsSyncLocked(spiderId primitive.ObjectID) (ok bool) {
_, ok = svc.syncLocks.Load(spiderId)
return ok
}
func (svc *Service) LockSync(spiderId primitive.ObjectID) {
svc.syncLocks.Store(spiderId, true)
}
func (svc *Service) UnlockSync(spiderId primitive.ObjectID) {
svc.syncLocks.Delete(spiderId)
}
//func (svc *Service) GetMaxRunners() (maxRunners int) {
// return svc.maxRunners
//}
//
//func (svc *Service) SetMaxRunners(maxRunners int) {
// svc.maxRunners = maxRunners
//}
func (svc *Service) GetExitWatchDuration() (duration time.Duration) {
return svc.exitWatchDuration
}
func (svc *Service) SetExitWatchDuration(duration time.Duration) {
svc.exitWatchDuration = duration
}
func (svc *Service) GetReportInterval() (interval time.Duration) {
return svc.reportInterval
}
func (svc *Service) SetReportInterval(interval time.Duration) {
svc.reportInterval = interval
}
func (svc *Service) GetModelService() (modelSvc interfaces.GrpcClientModelService) {
return svc.clientModelSvc
}
func (svc *Service) GetModelSpiderService() (modelSpiderSvc interfaces.GrpcClientModelSpiderService) {
return svc.clientModelSpiderSvc
}
func (svc *Service) GetModelTaskService() (modelTaskSvc interfaces.GrpcClientModelTaskService) {
return svc.clientModelTaskSvc
}
func (svc *Service) GetModelTaskStatService() (modelTaskSvc interfaces.GrpcClientModelTaskStatService) {
return svc.clientModelTaskStatSvc
}
func (svc *Service) GetNodeConfigService() (cfgSvc interfaces.NodeConfigService) {
return svc.cfgSvc
}
func (svc *Service) GetCurrentNode() (n interfaces.Node, err error) {
// node key
nodeKey := svc.cfgSvc.GetNodeKey()
// current node
if svc.cfgSvc.IsMaster() {
n, err = svc.modelSvc.GetNodeByKey(nodeKey, nil)
} else {
n, err = svc.clientModelNodeSvc.GetNodeByKey(nodeKey)
}
if err != nil {
return nil, err
}
return n, nil
}
func (svc *Service) GetTaskById(id primitive.ObjectID) (t interfaces.Task, err error) {
if svc.cfgSvc.IsMaster() {
t, err = svc.modelSvc.GetTaskById(id)
} else {
t, err = svc.clientModelTaskSvc.GetTaskById(id)
}
if err != nil {
return nil, err
}
return t, nil
}
func (svc *Service) GetSpiderById(id primitive.ObjectID) (s interfaces.Spider, err error) {
if svc.cfgSvc.IsMaster() {
s, err = svc.modelSvc.GetSpiderById(id)
} else {
s, err = svc.clientModelSpiderSvc.GetSpiderById(id)
}
if err != nil {
return nil, err
}
return s, nil
}
func (svc *Service) getRunnerCount() (n int) {
svc.mu.Lock()
defer svc.mu.Unlock()
svc.runners.Range(func(key, value interface{}) bool {
n++
return true
})
return n
}
func (svc *Service) getRunner(taskId primitive.ObjectID) (r interfaces.TaskRunner, err error) {
//r, ok := svc.runners[taskId]
v, ok := svc.runners.Load(taskId)
if !ok {
return nil, errors.ErrorTaskNotExists
}
switch v.(type) {
case interfaces.TaskRunner:
r = v.(interfaces.TaskRunner)
default:
return nil, errors.ErrorModelInvalidType
}
return r, nil
}
func (svc *Service) addRunner(taskId primitive.ObjectID, r interfaces.TaskRunner) {
svc.mu.Lock()
defer svc.mu.Unlock()
svc.runners.Store(taskId, r)
}
func (svc *Service) deleteRunner(taskId primitive.ObjectID) {
svc.mu.Lock()
defer svc.mu.Unlock()
svc.runners.Delete(taskId)
}
func (svc *Service) saveTask(t interfaces.Task, status string) (err error) {
// normalize status
if status == "" {
status = constants.TaskStatusPending
}
// set task status
t.SetStatus(status)
// attempt to get task from database
_, err = svc.clientModelTaskSvc.GetTaskById(t.GetId())
if err != nil {
// if task does not exist, add to database
if err == mongo.ErrNoDocuments {
if err := client.NewModelDelegate(t, client.WithDelegateConfigPath(svc.GetConfigPath())).Add(); err != nil {
return err
}
return nil
} else {
return err
}
} else {
// otherwise, update
if err := client.NewModelDelegate(t, client.WithDelegateConfigPath(svc.GetConfigPath())).Save(); err != nil {
return err
}
return nil
}
}
func (svc *Service) reportStatus() (err error) {
// current node
n, err := svc.GetCurrentNode()
if err != nil {
return err
}
// update node
ar := n.GetMaxRunners() - svc.getRunnerCount()
n.SetAvailableRunners(ar)
// save node
if svc.cfgSvc.IsMaster() {
err = delegate.NewModelDelegate(n).Save()
} else {
err = client.NewModelDelegate(n, client.WithDelegateConfigPath(svc.GetConfigPath())).Save()
}
if err != nil {
return err
}
return nil
}
func NewTaskHandlerService(opts ...Option) (svc2 interfaces.TaskHandlerService, err error) {
// base service
baseSvc, err := task.NewBaseService()
if err != nil {
return nil, trace.TraceError(err)
}
// service
svc := &Service{
TaskBaseService: baseSvc,
exitWatchDuration: 60 * time.Second,
reportInterval: 5 * time.Second,
mu: sync.Mutex{},
runners: sync.Map{},
syncLocks: sync.Map{},
}
// apply options
for _, opt := range opts {
opt(svc)
}
// dependency injection
c := dig.New()
if err := c.Provide(config.ProvideConfigService(svc.GetConfigPath())); err != nil {
return nil, trace.TraceError(err)
}
if err := c.Provide(service.NewService); err != nil {
return nil, trace.TraceError(err)
}
if err := c.Provide(client.ProvideServiceDelegate(svc.GetConfigPath())); err != nil {
return nil, trace.TraceError(err)
}
if err := c.Provide(client.ProvideNodeServiceDelegate(svc.GetConfigPath())); err != nil {
return nil, trace.TraceError(err)
}
if err := c.Provide(client.ProvideSpiderServiceDelegate(svc.GetConfigPath())); err != nil {
return nil, trace.TraceError(err)
}
if err := c.Provide(client.ProvideTaskServiceDelegate(svc.GetConfigPath())); err != nil {
return nil, trace.TraceError(err)
}
if err := c.Provide(client.ProvideTaskStatServiceDelegate(svc.GetConfigPath())); err != nil {
return nil, trace.TraceError(err)
}
if err := c.Invoke(func(
cfgSvc interfaces.NodeConfigService,
modelSvc service.ModelService,
clientModelSvc interfaces.GrpcClientModelService,
clientModelNodeSvc interfaces.GrpcClientModelNodeService,
clientModelSpiderSvc interfaces.GrpcClientModelSpiderService,
clientModelTaskSvc interfaces.GrpcClientModelTaskService,
clientModelTaskStatSvc interfaces.GrpcClientModelTaskStatService,
) {
svc.cfgSvc = cfgSvc
svc.modelSvc = modelSvc
svc.clientModelSvc = clientModelSvc
svc.clientModelNodeSvc = clientModelNodeSvc
svc.clientModelSpiderSvc = clientModelSpiderSvc
svc.clientModelTaskSvc = clientModelTaskSvc
svc.clientModelTaskStatSvc = clientModelTaskStatSvc
}); err != nil {
return nil, trace.TraceError(err)
}
return svc, nil
}
func ProvideTaskHandlerService(path string, opts ...Option) func() (svc interfaces.TaskHandlerService, err error) {
// config path
opts = append(opts, WithConfigPath(path))
return func() (svc interfaces.TaskHandlerService, err error) {
return NewTaskHandlerService(opts...)
}
}
var store = sync.Map{}
func GetTaskHandlerService(path string, opts ...Option) (svr interfaces.TaskHandlerService, err error) {
if path == "" {
path = config2.DefaultConfigPath
}
opts = append(opts, WithConfigPath(path))
res, ok := store.Load(path)
if ok {
svr, ok = res.(interfaces.TaskHandlerService)
if ok {
return svr, nil
}
}
svr, err = NewTaskHandlerService(opts...)
if err != nil {
return nil, err
}
store.Store(path, svr)
return svr, nil
}
func ProvideGetTaskHandlerService(path string, opts ...Option) func() (svr interfaces.TaskHandlerService, err error) {
// report interval
reportIntervalSeconds := viper.GetInt("task.handler.reportInterval")
if reportIntervalSeconds > 0 {
opts = append(opts, WithReportInterval(time.Duration(reportIntervalSeconds)*time.Second))
}
return func() (svr interfaces.TaskHandlerService, err error) {
return GetTaskHandlerService(path, opts...)
}
}