Created
October 16, 2020 09:01
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appengine/datastore と cloud/datastore の timezone に関する挙動を確認する
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| package main | |
| import ( | |
| "context" | |
| "fmt" | |
| "net/http" | |
| "time" | |
| cldatastore "cloud.google.com/go/datastore" | |
| "google.golang.org/appengine" | |
| aedatastore "google.golang.org/appengine/datastore" | |
| "google.golang.org/appengine/log" | |
| ) | |
| type User struct { | |
| Name string | |
| CreatedAt time.Time | |
| } | |
| var jstLoc *time.Location | |
| var pstLoc *time.Location | |
| func init() { | |
| var err error | |
| jstLoc, err = time.LoadLocation("Asia/Tokyo") | |
| if err != nil { | |
| panic(err) | |
| } | |
| pstLoc, err = time.LoadLocation("America/Dawson") | |
| if err != nil { | |
| panic(err) | |
| } | |
| } | |
| func main() { | |
| http.HandleFunc("/appengine", hookError(func(ctx context.Context) ([]string, error) { | |
| var outputs []string | |
| k := aedatastore.NewKey(ctx, "User", "id-appengine", 0, nil) | |
| put := &User{ | |
| Name: "appengine", | |
| CreatedAt: time.Date(2020, 1, 2, 1, 2, 3, 0, jstLoc), | |
| } | |
| if _, err := aedatastore.Put(ctx, k, put); err != nil { | |
| return nil, err | |
| } | |
| got := new(User) | |
| if err := aedatastore.Get(ctx, k, got); err != nil { | |
| return nil, err | |
| } | |
| outputs = append(outputs, fmt.Sprintf("put: %+v, loc: %#v", put, put.CreatedAt.Location())) | |
| outputs = append(outputs, fmt.Sprintf("got: %+v, loc: %#v", got, got.CreatedAt.Location())) | |
| return outputs,nil | |
| })) | |
| http.HandleFunc("/cloud", hookError(func(ctx context.Context) ([]string, error) { | |
| var outputs []string | |
| client, err := cldatastore.NewClient(ctx, cldatastore.DetectProjectID) | |
| if err != nil { | |
| return nil, err | |
| } | |
| defer func(){ | |
| client.Close() | |
| }() | |
| k := cldatastore.NameKey("User", "id-cloud", nil) | |
| put := &User{ | |
| Name: "cloud", | |
| CreatedAt: time.Date(2020, 1, 2, 1, 2, 3, 0, pstLoc), | |
| } | |
| if _, err := client.Put(ctx, k, put); err != nil { | |
| return nil, err | |
| } | |
| got := new(User) | |
| if err := client.Get(ctx, k, got); err != nil { | |
| return nil, err | |
| } | |
| outputs = append(outputs, fmt.Sprintf("put: %+v, loc: %#v", put, put.CreatedAt.Location())) | |
| outputs = append(outputs, fmt.Sprintf("got: %+v, loc: %#v", got, got.CreatedAt.Location())) | |
| return outputs, nil | |
| })) | |
| appengine.Main() | |
| } | |
| func hookError(f func (ctx context.Context) ([]string, error)) func(http.ResponseWriter, *http.Request) { | |
| return func(w http.ResponseWriter, r *http.Request) { | |
| ctx := appengine.NewContext(r) | |
| outputs, err := f(ctx) | |
| if err != nil { | |
| log.Errorf(ctx, "error: %+v", err) | |
| http.Error(w, err.Error(), 500) | |
| return | |
| } | |
| w.Header().Set("Content-Type", "text/plain; charset=utf-8") | |
| for _, o:= range outputs { | |
| fmt.Fprintf(w, "%s\n", o) | |
| } | |
| } | |
| } |
datastore console 上の表示
PC のタイムゾーンをウランバートル標準時に変えてから再度 datastore console を表示した結果
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結果まとめ
環境
/appengine 呼び出し結果
appengine/datastore を使って entity を put し、同じ entity を get したときの両者の値を確認する
/cloud 呼び出し結果
cloud/datastore を使って entity を put し、同じ entity を get したときの両者の値を確認する
（datastore console 上の表示が、保存時の timezone に関係するかどうかを調べるため、保存する entity の timezone を JST 以外にしている）