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datastore.go
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datastore.go
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package datastore
import (
"crypto/rand"
"fmt"
"math/big"
"net/http"
"strconv"
"time"
cloudds "cloud.google.com/go/datastore"
"golang.org/x/net/context"
"google.golang.org/appengine"
"google.golang.org/appengine/datastore"
"google.golang.org/appengine/log"
)
type Entity struct {
Name string
Value int64
Created time.Time
}
func StoreEntity(ctx context.Context, name string, value int64) error {
e := &Entity{
Name: name,
Value: value,
Created: time.Now(),
}
key := datastore.NewIncompleteKey(ctx, "Entity", nil)
// key := datastore.Key{}
key, err := datastore.Put(ctx, key, e)
log.Infof(ctx, "new key = %#v", key)
return err
}
func handleStoreEntity(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
name := r.FormValue("name")
if name == "" {
name = "World"
}
value, err := strconv.ParseInt(r.FormValue("value"), 0, 64)
if err != nil {
log.Errorf(ctx, "Failed to parse value: %v", err)
}
if err := StoreEntity(ctx, name, value); err != nil {
log.Errorf(ctx, "Failed to store an entity: %v", err)
}
}
func handleConflictNew(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
rn, err := rand.Int(rand.Reader, big.NewInt(1000*1000))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
keyStr := fmt.Sprintf("randkey%d", rn.Int64())
key := datastore.NewKey(ctx, "Entity", keyStr, 0, nil)
done := make(chan error)
for i := 0; i < 2; i++ {
go func(i int) {
done <- datastore.RunInTransaction(ctx, func(ctx context.Context) error {
var entity Entity
err := datastore.Get(ctx, key, &entity)
if err != nil && err != datastore.ErrNoSuchEntity {
return err
}
if err == nil {
return fmt.Errorf("%s already exists", keyStr)
}
time.Sleep(time.Second)
datastore.Put(ctx, key, &Entity{Value: int64(i)})
return nil
}, &datastore.TransactionOptions{
Attempts: 1,
})
}(i)
}
w.Header().Add("Content-Type", "text/plain")
for i := 0; i < 2; i++ {
if err := <-done; err != nil {
log.Errorf(ctx, "%v", err)
fmt.Fprintln(w, err)
} else {
fmt.Fprintln(w, "OK!")
}
}
}
// It seems cloud datastore API also works in GAE SE.
func handleCloudDatastoreAPI(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
client, err := cloudds.NewClient(ctx, "yunabe-codelab")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
_, err = client.Put(ctx, cloudds.NameKey("Entity", "cloudapi", nil), &Entity{
Name: "cloud-api-entity",
Value: 1234,
})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func RegisterHandlers() {
http.HandleFunc("/datastore/store_entity", handleStoreEntity)
http.HandleFunc("/datastore/conflict_new", handleConflictNew)
http.HandleFunc("/datastore/cloud_api", handleCloudDatastoreAPI)
}