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db.go
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db.go
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package main
import (
"context"
"crypto/sha256"
"encoding/hex"
"strings"
"time"
"cloud.google.com/go/datastore"
)
// DB is a layer of business logic on top of an underlying datastore
type DB struct {
client *datastore.Client
}
// NewDB creates a new DB
func NewDB(client *datastore.Client) *DB {
return &DB{
client: client,
}
}
// GetUser gets a user by email
func (db *DB) GetUser(ctx context.Context, email string) (*User, error) {
user := &User{}
err := db.client.Get(ctx, userKey(email), user)
if err != nil {
return nil, err
}
return user, nil
}
// CreateUser creates and stores a new User
func (db *DB) CreateUser(ctx context.Context, email string) (*User, error) {
now := time.Now()
user := &User{
Email: email,
Created: now,
Updated: now,
}
_, err := db.client.Put(ctx, userKey(email), user)
if err != nil {
return nil, err
}
return user, nil
}
// PutUser updates an existing User
func (db *DB) PutUser(ctx context.Context, user *User) error {
user.Updated = time.Now()
_, err := db.client.Put(ctx, userKey(user.Email), user)
return err
}
func userKey(email string) *datastore.Key {
return datastore.NameKey("User", email, nil)
}
func hashStrings(xs ...string) string {
h := sha256.New()
return hex.EncodeToString(h.Sum(joinForKey(xs...)))
}
func joinForKey(xs ...string) []byte {
return []byte(strings.Join(xs, "/"))
}