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service.go
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service.go
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package endly
import (
"fmt"
"github.com/viant/endly/model/msg"
_ "github.com/viant/endly/unsafe"
"github.com/viant/toolbox"
"github.com/viant/toolbox/data"
"github.com/viant/toolbox/url"
"reflect"
"sync"
"sync/atomic"
"time"
)
//AbstractService represenst an abstract service.
type AbstractService struct {
Service
*sync.RWMutex
routeByAction map[string]*Route
routeByRequest map[reflect.Type]*Route
actions []string
id string
state data.Map
}
//Mutex returns a mutex.
func (s *AbstractService) Mutex() *sync.RWMutex {
return s.RWMutex
}
//Register register action routes
func (s *AbstractService) Register(routes ...*Route) {
for _, route := range routes {
s.routeByAction[route.Action] = route
s.routeByRequest[reflect.TypeOf(route.RequestProvider())] = route
s.actions = append(s.actions, route.Action)
}
}
func (s *AbstractService) addRouteIfConvertible(request interface{}) *Route {
var requestType = reflect.TypeOf(request)
if requestType != nil {
for k, v := range s.routeByRequest {
if requestType.Kind() == reflect.Ptr && requestType.Elem().ConvertibleTo(k.Elem()) {
s.routeByRequest[requestType] = &Route{
Action: v.Action,
RequestInfo: v.RequestInfo,
ResponseInfo: v.ResponseInfo,
RequestProvider: v.RequestProvider,
ResponseProvider: v.ResponseProvider,
Handler: func(context *Context, convertibleRequest interface{}) (interface{}, error) {
var request = v.RequestProvider()
var requestValue = reflect.ValueOf(request)
var convertibleValue = reflect.ValueOf(convertibleRequest)
requestValue.Elem().Set(convertibleValue.Elem().Convert(k.Elem()))
return v.Handler(context, request)
},
}
return s.routeByRequest[requestType]
}
}
}
return nil
}
//Run returns a service action for supplied action
func (s *AbstractService) Run(context *Context, request interface{}) (response *ServiceResponse) {
response = &ServiceResponse{Status: "ok"}
startEvent := s.Begin(context, request)
var err error
defer func() {
s.End(context)(startEvent, response.Response)
if err != nil {
response.Err = err
response.Status = "error"
response.Error = fmt.Sprintf("%v", err)
}
}()
service, ok := s.routeByRequest[reflect.TypeOf(request)]
if !ok {
service = s.addRouteIfConvertible(request)
if service == nil {
err = NewError(s.ID(), fmt.Sprintf("%T", request), fmt.Errorf("failed to lookup service route: %T", request))
return response
}
}
if initializer, ok := request.(Initializer); ok {
if err = initializer.Init(); err != nil {
err = NewError(s.ID(), service.Action, fmt.Errorf("init %T failed: %v", request, err))
return response
}
}
if validator, ok := request.(Validator); ok {
if err = validator.Validate(); err != nil {
err = NewError(s.ID(), service.Action, fmt.Errorf("validation %T failed: %v", request, err))
return response
}
}
response.Response, err = service.Handler(context, request)
if err != nil {
var previous = err
err = NewError(s.ID(), service.Action, err)
if previous != err {
context.Publish(msg.NewErrorEvent(fmt.Sprintf("%v", err)))
}
response.Err = err
}
return response
}
//Route returns a service action route for supplied action
func (s *AbstractService) Route(action string) (*Route, error) {
if result, ok := s.routeByAction[action]; ok {
return result, nil
}
return nil, fmt.Errorf("unknown %v.%v service action", s.id, action)
}
//Sleep sleeps for provided time in ms
func (s *AbstractService) Sleep(context *Context, sleepTimeMs int) {
if sleepTimeMs == 0 {
return
}
sleepTime := time.Millisecond * time.Duration(sleepTimeMs)
if sleepTime < time.Minute {
if context.IsLoggingEnabled() {
context.Publish(msg.NewSleepEvent(sleepTimeMs))
}
time.Sleep(sleepTime)
return
}
startTime := time.Now()
for {
if context.IsLoggingEnabled() {
context.Publish(msg.NewSleepEvent(1000))
}
if time.Now().Sub(startTime) >= sleepTime {
break
}
time.Sleep(time.Second)
}
}
//GetHostAndSSHPort return host and ssh port
func (s *AbstractService) GetHostAndSSHPort(target *url.Resource) (string, int) {
if target == nil {
return "", 0
}
port := toolbox.AsInt(target.ParsedURL.Port())
if port == 0 {
port = 22
}
hostname := target.ParsedURL.Hostname()
if hostname == "" {
hostname = "127.0.0.1"
}
return hostname, port
}
//Actions returns service actions
func (s *AbstractService) Actions() []string {
return s.actions
}
//Begin add starting event
func (s *AbstractService) Begin(context *Context, value interface{}) msg.Event {
return context.Publish(value)
}
//End adds finishing event.
func (s *AbstractService) End(context *Context) func(startEvent msg.Event, value interface{}) msg.Event {
return func(startEvent msg.Event, value interface{}) msg.Event {
return context.PublishWithStartEvent(value, startEvent)
}
}
//ID returns this service id.
func (s *AbstractService) ID() string {
return s.id
}
//State returns this service state map.
func (s *AbstractService) State() data.Map {
return s.state
}
func (s *AbstractService) RunInBackground(context *Context, handler func() error) (err error) {
wait := &sync.WaitGroup{}
wait.Add(1)
var done uint32 = 0
go func() {
for {
if atomic.LoadUint32(&done) == 1 {
break
}
s.Sleep(context, 2000)
}
}()
go func() {
defer wait.Done()
err = handler()
}()
wait.Wait()
atomic.StoreUint32(&done, 1)
return err
}
//NewAbstractService creates a new abstract service.
func NewAbstractService(id string) *AbstractService {
return &AbstractService{
id: id,
actions: make([]string, 0),
RWMutex: &sync.RWMutex{},
state: data.NewMap(),
routeByAction: make(map[string]*Route),
routeByRequest: make(map[reflect.Type]*Route),
}
}
//NopRequest represent no operation to be deprecated
type NopRequest struct {
In interface{}
}
//nopService represents no operation nopService (deprecated, use workflow, nop instead)
type nopService struct {
*AbstractService
}
func (s *nopService) registerRoutes() {
s.Register(&Route{
Action: "nop",
RequestInfo: &ActionInfo{
Description: "no operation action, helper for separating action.Init as self descriptive steps",
},
RequestProvider: func() interface{} {
return &NopRequest{}
},
ResponseProvider: func() interface{} {
return struct{}{}
},
Handler: func(context *Context, request interface{}) (interface{}, error) {
if req, ok := request.(*NopRequest); ok {
return req.In, nil
}
return nil, fmt.Errorf("unsupported request type: %T", request)
},
})
}
//newNopService creates a new NoOperation nopService.
func newNopService() Service {
var result = &nopService{
AbstractService: NewAbstractService("nop"),
}
result.AbstractService.Service = result
result.registerRoutes()
return result
}