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engine.go
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engine.go
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package engine
import (
"context"
"errors"
"fmt"
"github.com/woocoos/workflow/ent"
"github.com/woocoos/workflow/pkg/api"
"github.com/woocoos/workflow/pkg/spec/bpmn"
"github.com/woocoos/workflow/pkg/spec/vars"
"go.temporal.io/api/enums/v1"
"go.temporal.io/sdk/temporal"
"go.temporal.io/sdk/workflow"
"os"
"path/filepath"
"strconv"
"time"
)
type (
Option func(*BPMN)
// BPMN is a workflow engine for bpmn
BPMN struct {
// worker id
Id string
Exporter api.Exporter
Handlers *HandlerFuncMap
Activity *BpmnActivity
ResourceDir string
}
)
// WithResourceDir 指定资源目录,在工作流中必须指定
func WithResourceDir(dir string) Option {
return func(bp *BPMN) {
bp.ResourceDir = dir
}
}
// WithExporter 指定外部相关接口实现.
func WithExporter(exporter api.Exporter) Option {
return func(bp *BPMN) {
bp.Exporter = exporter
}
}
func WithID(id string) Option {
return func(bp *BPMN) {
bp.Id = id
}
}
func NewBPMN(opts ...Option) *BPMN {
bp := &BPMN{}
bp.Activity = &BpmnActivity{
Engine: bp,
}
for _, opt := range opts {
opt(bp)
}
bp.Handlers = NewHandlerFuncMap(bp.Id)
if bp.Exporter == nil {
}
return bp
}
func DefaultActivityOption() workflow.ActivityOptions {
return workflow.ActivityOptions{
StartToCloseTimeout: time.Minute * 10,
}
}
func (bp *BPMN) StartInstance(loader *BpmnLoader, pi *api.InstanceRequest) (*Iterator, error) {
pd := loader.FindProcess(pi.ProcDefKey)
if pd == nil {
return nil, fmt.Errorf("[RunInstance]process %s not found", pi.ProcDefKey)
}
it := &Iterator{
loader: loader,
process: pd,
Request: pi,
}
for _, event := range it.process.StartEvents {
it.queue = append(it.queue, event)
}
return it, nil
}
func (bp *BPMN) Start(ctx workflow.Context, pi *api.InstanceRequest, loader *BpmnLoader) (err error) {
iterator, err := bp.StartInstance(loader, pi)
if err != nil {
return
}
iterator.CurrentHandler = func(it *Iterator, ele bpmn.Elementor) (err error) {
switch et := ele.(type) {
case *bpmn.StartEvent:
// TODO message hanndler
case *bpmn.UserTask:
err = bp.handleUserTask(ctx, pi, et)
case *bpmn.BusinessRuleTask:
err = bp.handleBusinessRuleTask(ctx, pi, et)
case *bpmn.ServiceTask:
err = bp.handleServiceTask(ctx, pi, et)
case *bpmn.EventBasedGateway:
case *bpmn.IntermediateCatchEvent:
err = bp.handleIntermediateCatchEvent(ctx, it, pi, et)
case *bpmn.CallActivity:
err = bp.handleCallActivity(ctx, pi, et)
case *bpmn.EndEvent:
default:
// do nothing
}
return
}
iterator.QueueHandler = func(it *Iterator, subs []bpmn.Elementor) (next bpmn.Elementor, err error) {
switch it.current.(type) {
case *bpmn.EventBasedGateway:
return bp.handleEventBasedGateway(ctx, it, pi, subs)
}
return nil, fmt.Errorf("not support queue handler: %T", it.current)
}
for iterator.Next() {
err = iterator.Err()
if err != nil {
return
}
}
err = iterator.Err()
return err
}
func (bp *BPMN) handleEventBasedGateway(ctx workflow.Context, it *Iterator, pi *api.InstanceRequest, subs []bpmn.Elementor) (next bpmn.Elementor, err error) {
//logger := workflow.GetLogger(ctx)
evl := EventListen{
loader: it.Loader(),
eles: subs,
input: pi.Variables,
}
workflow.Go(ctx, evl.MultiEventListen)
err = workflow.Await(ctx, func() bool {
if evl.err != nil {
err = evl.err
return true
}
return evl.isComplete
})
next = evl.next
for k, v := range evl.output {
pi.Variables[k] = v
}
return
}
func (bp *BPMN) handleIntermediateCatchEvent(ctx workflow.Context, it *Iterator, pi *api.InstanceRequest, ele *bpmn.IntermediateCatchEvent) (err error) {
evl := EventListen{
loader: it.Loader(),
eles: []bpmn.Elementor{ele},
input: pi.Variables,
}
workflow.Go(ctx, evl.MultiEventListen)
err = workflow.Await(ctx, func() bool {
if evl.err != nil {
err = evl.err
return true
}
return evl.isComplete
})
for k, v := range evl.output {
pi.Variables[k] = v
}
return
}
func (bp *BPMN) handleServiceTask(ctx workflow.Context, pi *api.InstanceRequest, taskEle *bpmn.ServiceTask) error {
if taskEle.TaskDefinition == nil {
return fmt.Errorf("service task definition not found: %s", taskEle.Id)
}
typename, err := taskEle.TaskDefinition.GetType()
if err != nil {
return err
}
ao := DefaultActivityOption()
_ = taskEle.ExtensionProperties.Decode(&ao) // ignore error
v, err := taskEle.TaskDefinition.GetRetries()
if err != nil {
return err
}
if v > 0 {
ao.RetryPolicy = &temporal.RetryPolicy{
MaximumAttempts: int32(v),
}
}
ctx = workflow.WithActivityOptions(ctx, ao)
var variables vars.Mapping
switch typename {
case "http":
err = workflow.ExecuteActivity(ctx, bp.Activity.HttpServiceTaskActivity, api.ServiceTaskActivityRequest{
InstanceRequest: pi,
Element: taskEle,
}).Get(ctx, &variables)
default:
err = workflow.ExecuteActivity(ctx, bp.Activity.ServiceTaskActivity, api.ServiceTaskActivityRequest{
InstanceRequest: pi,
Element: taskEle,
}).Get(ctx, &variables)
}
if err != nil {
return err
}
for k, v := range variables {
pi.Variables[k] = v
}
return nil
}
func (bp *BPMN) handleUserTask(ctx workflow.Context, pi *api.InstanceRequest, taskEle *bpmn.UserTask) error {
logger := workflow.GetLogger(ctx)
if taskEle.Assignment == nil {
logger.Warn("user task assignment is nil", "task", taskEle.Id)
return nil
}
ao := DefaultActivityOption()
_ = taskEle.ExtensionProperties.Decode(&ao) // ignore error
ctx = workflow.WithActivityOptions(ctx, ao)
var task ent.Task
err := workflow.ExecuteActivity(ctx, bp.Activity.CreateUserTaskActivity, api.UserTaskActivityRequest{
InstanceRequest: pi,
Element: taskEle,
}).Get(ctx, &task)
if err != nil {
return err
}
ul := UserTaskListen{
task: &task,
exporter: bp.Exporter,
}
workflow.Go(ctx, ul.Listen)
var iscomplete bool
awErr := workflow.Await(ctx, func() bool {
iscomplete, err = ul.CheckComplete(context.Background(), taskEle)
if err != nil {
return true
}
return iscomplete
})
if awErr != nil || err != nil {
return errors.Join(awErr, err)
}
return nil
}
func (bp *BPMN) handleCallActivity(ctx workflow.Context, pi *api.InstanceRequest, el *bpmn.CallActivity) error {
logger := workflow.GetLogger(ctx)
cdf, err := bp.Exporter.GetProcDef(context.Background(), &api.GetProcDefRequest{
ProcDefKey: el.CalledElement.ProcessId,
TenantID: pi.TenantID,
})
cir := api.InstanceRequest{
ProcInst: pi.ProcInst,
ProcDefKey: cdf.Key,
ResourceKey: cdf.ResourceKey,
}
if el.CalledElement.PropagateAllChildVariables {
cir.Variables = pi.Variables
} else {
cir.Variables = make(vars.Mapping)
for _, ot := range el.Outputs {
err = ot.OutputTarget(pi.Variables, cir.Variables)
if err != nil {
return err
}
}
}
cwo := workflow.ChildWorkflowOptions{
ParentClosePolicy: enums.PARENT_CLOSE_POLICY_ABANDON,
}
ctx = workflow.WithChildOptions(ctx, cwo)
var result vars.Mapping
err = workflow.ExecuteChildWorkflow(ctx, workflow.GetInfo(ctx).WorkflowType.Name, cir).Get(ctx, &result)
if err != nil {
logger.Error("Parent execution received child execution failure.", "Error", err)
return err
}
return err
}
func loadDMN(resourceDir string, cdf *ent.DecisionReqDef) (*DMNLoader, error) {
dmn := NewDMNLoader(strconv.Itoa(cdf.ID))
bs, err := os.ReadFile(filepath.Join(resourceDir, cdf.ResourceKey))
if err != nil {
return nil, err
}
if err := dmn.Load(bs); err != nil {
return nil, err
}
// TODO load from other ,cache
return dmn, nil
}
func (bp *BPMN) handleBusinessRuleTask(ctx workflow.Context, pi *api.InstanceRequest, el *bpmn.BusinessRuleTask) error {
ao := DefaultActivityOption()
_ = el.ExtensionProperties.Decode(&ao) // ignore error
ctx = workflow.WithActivityOptions(ctx, ao)
var variables vars.Mapping
err := workflow.ExecuteActivity(ctx, bp.Activity.BusinessRuleTaskActivity, api.BusinessRuleTaskActivityRequest{
InstanceRequest: pi,
Element: el,
}).Get(ctx, &variables)
if err != nil {
return err
}
for k, v := range variables {
pi.Variables[k] = v
}
return nil
}