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task.go
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task.go
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package task
import (
"context"
"errors"
"fmt"
"sync"
"cuelang.org/go/cue"
"github.com/rs/zerolog/log"
)
var (
ErrNotTask = errors.New("not a task")
tasks sync.Map
typePath = cue.MakePath(
cue.Str("$dagger"),
cue.Str("task"),
cue.Hid("_name", "github.com/xxf098/actionflow"))
corePath = cue.MakePath(
cue.Str("$dagger"),
cue.Str("task"),
cue.Hid("_name", "github.com/xxf098/actionflow/core"))
paths = []cue.Path{corePath, typePath}
)
// State is the state of the task.
type State int8
func (s State) String() string {
return [...]string{"computing", "skipped", "completed", "cancelled", "failed"}[s]
}
func ParseState(s string) (State, error) {
switch s {
case "computing":
return StateComputing, nil
case "skipped":
return StateSkipped, nil
case "cancelled":
return StateCanceled, nil
case "failed":
return StateFailed, nil
case "completed":
return StateCompleted, nil
}
return -1, fmt.Errorf("invalid state [%s]", s)
}
func (s State) CanTransition(t State) bool {
return s <= t
}
const (
// state order is important here since it defines the order
// on how states can transition only forwards
// computing > completed > canceled > failed
StateComputing State = iota
StateSkipped
StateCompleted
StateCanceled
StateFailed
)
// return result
type Task interface {
Run(ctx context.Context, v *cue.Value) (*cue.Value, error)
Name() string
}
type NewFunc func() Task
// Register a task type and initializer
func Register(typ string, f NewFunc) {
tasks.Store(typ, f)
}
// New creates a new Task of the given type.
func New(typ string) Task {
v, ok := tasks.Load(typ)
if !ok {
return nil
}
fn := v.(NewFunc)
return fn()
}
// find action type by path
func Lookup(v *cue.Value) (Task, error) {
if v.Kind() != cue.StructKind {
return nil, ErrNotTask
}
typeString, err := lookupActionType(v)
if err != nil {
return nil, err
}
t := New(typeString)
if t == nil {
return nil, fmt.Errorf("unknown type %q", typeString)
}
return t, nil
}
func lookupType(v *cue.Value) (string, error) {
for _, path := range paths {
typ := v.LookupPath(path)
if typ.Exists() {
// fmt.Println(v.Cue())
return typ.String()
}
}
return "", ErrNotTask
}
// lookup action type in cue
func lookupActionType(v *cue.Value) (string, error) {
ik := v.IncompleteKind()
if ik.IsAnyOf(cue.StructKind) && v.IsConcrete() {
t, err := lookupType(v)
if err != nil {
return "", err
}
return t, nil
}
return "", ErrNotTask
}
// lookup action type in cue
func LookupAction(v *cue.Value) (string, *cue.Value) {
if t, err := lookupType(v); err == nil && len(t) > 0 {
return t, v
}
for iter, _ := v.Fields(cue.Optional(true)); iter.Next(); {
vn := iter.Value()
ik := vn.IncompleteKind()
if ik.IsAnyOf(cue.StructKind) && v.IsConcrete() {
t, err := lookupType(&vn)
if err != nil {
continue
}
return t, &vn
}
}
return "", nil
}
// do then action
func Then(ctx context.Context, v *cue.Value) error {
tv := v.LookupPath(cue.ParsePath("then"))
isBackground := false
if !tv.Exists() {
tv = v.LookupPath(cue.ParsePath("then_"))
isBackground = true
}
tk := tv.Kind()
if tk.IsAnyOf(cue.StructKind) && tv.IsConcrete() {
lg := log.Ctx(ctx)
task, err := Lookup(&tv)
if err != nil {
lg.Error().Err(err).Str("task", v.Path().String()).Msg(task.Name())
return err
} else {
if isBackground {
go func() {
if _, err := task.Run(ctx, &tv); err != nil {
lg.Error().Err(err).Str("task", v.Path().String()).Msg(task.Name())
}
}()
}
_, err := task.Run(ctx, &tv)
if err != nil {
return err
}
}
}
return nil
}