func Parallel(handlers map[string]server.Handler) server.Handler {
return server.Handler(
func(req *wcg.Request) response.Response {
var status = make(map[string]int)
var data = make(map[string]interface{})
var mutex sync.Mutex
var wg sync.WaitGroup
for k, q := range handlers {
wg.Add(1)
go func(k string, h server.Handler) {
defer wg.Done()
v := h.Handle(req)
if vv, ok := v.(*response.JSONResponse); ok {
mutex.Lock()
defer mutex.Unlock()
status[k] = vv.StatusCode
data[k] = vv.Data
}
}(k, q)
}
wg.Wait()
for k, code := range status {
// return non 2xx response
if code > 0 && (code < 200 || code >= 300) {
return response.NewJSONResponseWithStatus(data[k], code)
}
}
return response.NewJSONResponse(data)
})
}
func EntityPost(post *entities.Put) server.Handler {
return server.Handler(
func(req *wcg.Request) response.Response {
ent, err := post.Kind().CreateEntityFromForm(req.HTTPRequest().Form)
if err != nil { // ParseError
req.Logger.Warnf("You should use ParseForm middleware to avoid the error in EntityPost: %v", err)
return response.BadRequest(req, ErrInvalidFormParameters)
}
_, ent_ := post.MustUpdate(req, ent)
return response.NewJSONResponseWithStatus(ent_, 201)
})
}
// Process implements wcg.Handler#Process
func (h *Cron) Process(res *wcg.Response, req *wcg.Request) {
req.Logger.Infof("[Cron] %s (%s) - start", h.Path, h.Time)
for _, handler := range h.handlers {
if err := handler(req); err != nil {
req.Logger.Fatalf("[Cron] %s (%s) - error: %v", h.Path, h.Description, err)
response.NewJSONResponseWithStatus(err, 500).Render(res, req)
return
}
}
req.Logger.Infof("[Cron] %s (%s) - finish", h.Path, h.Description)
response.NewJSONResponse(true).Render(res, req)
return
}
func processEntityPut(req *wcg.Request, put *entities.Put, keyParams string, create bool) response.Response {
key := req.Param(keyParams)
_, ent := put.Kind().Get().Key(key).UseDefaultIfNil(create).MustOne(req)
if ent == nil {
return response.APINotFound
}
if req.HTTPRequest().Form == nil {
req.Logger.Warnf("You should use ParseForm middleware to avoid the error in EntityPut|EntityPutOrCreate")
return response.InternalServerError(req, ErrInvalidFormParameters).(response.Response)
}
err := put.Kind().UpdateEntityFromForm(ent, req.HTTPRequest().Form)
if err != nil {
return response.BadRequest(req, ErrInvalidFormParameters)
}
_, ent_ := put.Key(key).MustUpdate(req, ent)
return response.NewJSONResponseWithStatus(ent_, 200)
}
// Define endpoints to process an async task.
func (helper *AsyncAPIHelper) Define(path string) *AsyncAPIConfig {
if !strings.HasSuffix(path, "/") {
panic(fmt.Errorf("Task endpoint must end with '/' (%s)", path))
}
api := helper.app.API()
// /path/to/something/ => api-path-to-something
p := api.Path(path)
name := strings.Replace(p[1:len(p)-1], ":", "", -1) // remove parameters
name = strings.Replace(name, "/", "-", -1) // replace '/' with '-'
config := &AsyncAPIConfig{
Queue: helper.app.Queue().DefinePush(name),
app: helper.app,
path: path,
}
// Endpoint that trigger the task.
api.POST(path, Handler(
func(req *wcg.Request) response.Response {
for _, h := range config.triggerHandlers {
resp := h.Handle(req)
if resp != nil {
req.Logger.Debugf("Async Task is not triggered.")
return resp
}
}
task := &models.AsyncAPITask{}
task.ID = wcg.NewUUID()
task.Path = path
task.Query = req.HTTPRequest().URL.RawQuery
task.Status = models.AsyncAPIStatusReady
entities.AsyncAPITask.Put().Key(string(task.ID)).MustUpdate(req, task)
// Push a task
taskPath := fmt.Sprintf("%s%s.json?%s", req.URL().Path, string(task.ID), req.HTTPRequest().URL.Query().Encode())
if err := config.Queue.PushTask(req, taskPath, nil); err != nil {
return response.InternalServerError(req, err)
}
req.Logger.Infof("Triggered an async task [id:%s path:%s]", task.ID, taskPath)
return response.NewJSONResponseWithStatus(
AsyncTaskTriggerResponse{task.ID},
201,
)
},
))
// Endpoint that executes the task in background
// This endpoint must be called by PushQueue
api.POST(path+":taskid.json", Handler(
func(req *wcg.Request) response.Response {
if !request.IsTask(req) {
req.Logger.Warnf(
"Non system call to the async task endpoint: UserAgent=%s, IP=%s",
req.HTTPRequest().UserAgent(),
req.HTTPRequest().RemoteAddr,
)
return response.APIOK
}
_, one := entities.AsyncAPITask.Get().Key(req.Param("taskid")).MustOne(req)
if one == nil {
req.Logger.Warnf(
"Task %q not found: UserAgent=%s, IP=%s",
req.Param("taskid"),
req.HTTPRequest().UserAgent(),
req.HTTPRequest().RemoteAddr,
)
return response.APIOK
}
task := one.(*models.AsyncAPITask)
logger := wcg.NewLoggerWithPrefix(req, fmt.Sprintf("[AsyncTask: %s (queue: %s)]", task.ID, name))
if task.Status != models.AsyncAPIStatusReady && task.Status != models.AsyncAPIStatusRunning {
logger.Warnf("Task is not ready: Status=%s", task.Status)
return response.APIOK
}
if task.Status == models.AsyncAPIStatusReady {
task.StartAt = lib.Now()
task.Status = models.AsyncAPIStatusRunning
entities.AsyncAPITask.Put().Key(req.Param("taskid")).MustUpdate(req, task)
}
var err error
var progress *models.AsyncAPITaskProgress
var resp response.Response
func() {
defer func() {
if x := recover(); x != nil {
logger.Errorf("Unhandle error recovered from the task: %v", x)
err = fmt.Errorf("%v", x)
}
}()
progress, err = config.processHandler(req, task)
}()
if progress != nil {
task.Progress = append(task.Progress, *progress)
}
if progress != nil && progress.Next != nil {
// update the entity (Progress field)
entities.AsyncAPITask.Put().Key(req.Param("taskid")).MustUpdate(req, task)
// Push a next request into the queue
// This is not required in test environment as test code manually call the next request (see testhelper.AsyncTaskTestRunner#Run code)
// The test environment uses the response JSON to call the next URL and that response is used only for this purpose.
// If the code cannot push task for the next request, we should stop the task as failure.
logger.Infof("Task needs to call recursively: Next parameter is %v", progress.Next)
if !req.IsTest() {
err = config.Queue.PushTask(req, fmt.Sprintf("%s?%s", req.URL().Path, progress.Next.Encode()), nil)
}
if err == nil {
return response.NewJSONResponse(progress.Next)
}
// if an error occurrs by PushTask, just stopping the task and update the datastore as failure.
}
// finished the task
task.FinishAt = lib.Now()
tt := task.FinishAt.Sub(task.StartAt)
if err == nil {
task.Status = models.AsyncAPIStatusSuccess
logger.Infof("Task finished successfully (time: %s)", tt.String())
resp = response.APIOK
} else {
task.Error = err.Error()
task.Status = models.AsyncAPIStatusFailure
logger.Errorf("Task failed (time: %s): %s", tt.String(), task.Error)
resp = response.APIInternalServerError
}
entities.AsyncAPITask.Put().Key(req.Param("taskid")).MustUpdate(req, task)
return resp
},
))
// Endpoint that returns the task status.
api.GET(path+":taskid.json", Handler(
func(req *wcg.Request) response.Response {
for _, h := range config.triggerHandlers {
resp := h.Handle(req)
if resp != nil {
return resp
}
}
_, one := entities.AsyncAPITask.Get().Key(req.Param("taskid")).MustOne(req)
if one == nil {
return response.NotFound(req)
}
task := one.(*models.AsyncAPITask)
return response.NewJSONResponse(
AsyncTaskMonitorResponse{
ID: task.ID,
Status: task.Status,
Progress: task.LastProgress(),
},
)
},
))
return config
}