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todo_service.go
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todo_service.go
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package example_appengine
import (
"context"
"fmt"
"net/http"
"time"
"github.com/favclip/ucon"
"github.com/favclip/ucon/swagger"
"github.com/mjibson/goon"
"google.golang.org/appengine"
"google.golang.org/appengine/datastore"
)
func setupTodo(swPlugin *swagger.Plugin) {
s := &TodoService{}
tag := swPlugin.AddTag(&swagger.Tag{Name: "TODO", Description: "TODO list"})
var hInfo *swagger.HandlerInfo
hInfo = swagger.NewHandlerInfo(s.Get)
ucon.Handle("GET", "/todo/{id}", hInfo)
hInfo.Description, hInfo.Tags = "get todo entity", []string{tag.Name}
hInfo = swagger.NewHandlerInfo(s.List)
ucon.Handle("GET", "/todo", hInfo)
hInfo.Description, hInfo.Tags = "get todo list", []string{tag.Name}
hInfo = swagger.NewHandlerInfo(s.Insert)
ucon.Handle("POST", "/todo", hInfo)
hInfo.Description, hInfo.Tags = "post new todo entity", []string{tag.Name}
hInfo = swagger.NewHandlerInfo(s.Update)
ucon.Handle("PUT", "/todo/{id}", hInfo)
hInfo.Description, hInfo.Tags = "update todo entity", []string{tag.Name}
hInfo = swagger.NewHandlerInfo(s.Delete)
ucon.Handle("DELETE", "/todo/{id}", hInfo)
hInfo.Description, hInfo.Tags = "delete todo entity", []string{tag.Name}
}
type TodoService struct {
}
// +jwg
// +qbg
type Todo struct {
ID int64 `datastore:"-" goon:"id"`
Text string `swagger:",req"`
Done bool
UpdatedAt time.Time
CreatedAt time.Time
}
func (todo *Todo) Load(ps []datastore.Property) error {
if err := datastore.LoadStruct(todo, ps); err != nil {
return err
}
return nil
}
func (todo *Todo) Save() ([]datastore.Property, error) {
if todo.CreatedAt.IsZero() {
todo.CreatedAt = time.Now()
}
todo.UpdatedAt = time.Now()
ps, err := datastore.SaveStruct(todo)
if err != nil {
return nil, err
}
return ps, nil
}
type ListOpts struct {
Offset int `json:"offset" swagger:",in=query"`
Limit int `json:"limit" swagger:",in=query"`
}
type HttpError struct {
Code int `json:"code"`
Text string `json:"text"`
}
func (err *HttpError) Error() string {
return fmt.Sprintf("status %d: %s", err.Code, err.Text)
}
func (err *HttpError) StatusCode() int {
return err.Code
}
func (err *HttpError) ErrorMessage() interface{} {
return err
}
func (s *TodoService) Get(c context.Context, req *IntIDRequest) (*TodoJSON, error) {
if req.ID == 0 {
return nil, &HttpError{http.StatusBadRequest, "ID is required"}
}
g := goon.FromContext(c)
todo := &Todo{ID: req.ID}
err := g.Get(todo)
if err == datastore.ErrNoSuchEntity {
return nil, &HttpError{http.StatusNotFound, fmt.Sprintf("ID: %d is not found", req.ID)}
} else if err != nil {
return nil, err
}
resp, err := NewTodoJSONBuilder().AddAll().Convert(todo)
if err != nil {
return nil, err
}
return resp, nil
}
func (s *TodoService) List(c context.Context, r *http.Request, opts *ListOpts) ([]*TodoJSON, error) {
// ucon can return []*Xxx. but CloudEndpoints can't it.
// ucon can take 3 args. but go-endpoints can't it.
{
c := appengine.NewContext(r)
appengine.AppID(c)
}
g := goon.FromContext(c)
qb := NewTodoQueryBuilder()
if opts.Limit != 0 {
qb.Limit(opts.Limit)
}
if opts.Offset != 0 {
qb.Offset(opts.Offset)
}
qb.CreatedAt.Asc()
q := qb.Query()
var todoList []*Todo
_, err := g.GetAll(q, &todoList)
if err != nil {
return nil, err
}
resp, err := NewTodoJSONBuilder().AddAll().ConvertList(todoList)
if err != nil {
return nil, err
}
return resp, nil
}
func (s *TodoService) Insert(c context.Context, req *TodoJSON) (*TodoJSON, error) {
if req == nil {
return nil, &HttpError{http.StatusBadRequest, "Payload is required"}
}
if req.ID != 0 {
return nil, &HttpError{http.StatusBadRequest, "ID should be 0"}
}
todo, err := req.Convert()
if err != nil {
return nil, err
}
g := goon.FromContext(c)
_, err = g.Put(todo)
if err != nil {
return nil, err
}
resp, err := NewTodoJSONBuilder().AddAll().Convert(todo)
if err != nil {
return nil, err
}
return resp, nil
}
func (s *TodoService) Update(c context.Context, req *TodoJSON) (*TodoJSON, error) {
if req.ID == 0 {
return nil, &HttpError{http.StatusBadRequest, "ID is required"}
}
todo, err := req.Convert()
if err != nil {
return nil, err
}
old := &Todo{ID: todo.ID}
g := goon.FromContext(c)
err = g.RunInTransaction(func(g *goon.Goon) error {
err = g.Get(old)
if err == datastore.ErrNoSuchEntity {
return &HttpError{http.StatusNotFound, fmt.Sprintf("ID: %d is not found", req.ID)}
} else if err != nil {
return err
}
_, err = g.Put(todo)
if err != nil {
return err
}
return nil
}, nil)
if err != nil {
return nil, err
}
resp, err := NewTodoJSONBuilder().AddAll().Convert(todo)
if err != nil {
return nil, err
}
return resp, nil
}
func (s *TodoService) Delete(c context.Context, req *IntIDRequest) (*TodoJSON, error) {
if req.ID == 0 {
return nil, &HttpError{http.StatusBadRequest, "ID is required"}
}
todo := &Todo{ID: req.ID}
g := goon.FromContext(c)
err := g.Get(todo)
if err == datastore.ErrNoSuchEntity {
return nil, &HttpError{http.StatusNotFound, fmt.Sprintf("ID: %d is not found", req.ID)}
} else if err != nil {
return nil, err
}
key := g.Key(todo)
err = g.Delete(key)
if err != nil {
return nil, err
}
resp, err := NewTodoJSONBuilder().AddAll().Convert(todo)
if err != nil {
return nil, err
}
return resp, nil
}