-
Notifications
You must be signed in to change notification settings - Fork 0
/
operations.go
255 lines (234 loc) · 5.89 KB
/
operations.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
package handler
import (
"context"
"cloud.google.com/go/datastore"
log "github.com/micro/go-micro/v2/logger"
"github.com/enakai00/go-micro-gcp-example/purchase/ds"
"github.com/enakai00/go-micro-gcp-example/purchase/events"
purchase "github.com/enakai00/go-micro-gcp-example/purchase/proto/purchase"
)
func getCartStruct(cartid string) (*ds.Cart, bool) {
var cart ds.Cart
id := entityID{
name: "cartid",
value: cartid,
table: "Cart",
}
ok := getStructByID(id, &cart, nil)
return &cart, ok
}
func getOrderTicketStruct(orderid string) (*ds.OrderTicket, bool) {
var orderTicket ds.OrderTicket
id := entityID{
name: "orderid",
value: orderid,
table: "OrderTicket",
}
ok := getStructByID(id, &orderTicket, nil)
return &orderTicket, ok
}
func getCartItem(cartid string, itemid string) (*ds.CartItem, bool) {
cart, ok := getCartStruct(cartid)
if !ok {
return nil, false
}
cartItem := ds.CartItem{}
id := entityID{
name: "itemid",
value: itemid,
table: "CartItem",
}
ok = getStructByID(id, &cartItem, cart.Key)
return &cartItem, ok
}
func CreateCart(cartid string) *purchase.Cart {
cart, ok := getCartStruct(cartid)
if !ok {
cart = &ds.Cart{
Cartid: cartid,
Status: "open",
}
err := createEntity("Cart", cart, nil, nil)
if err != nil {
log.Fatalf("Error stroing data: %v", err)
}
}
purchaseCart := purchase.Cart{
Cartid: cart.Cartid,
Status: cart.Status,
}
return &purchaseCart
}
func GetCart(cartid string) *purchase.Cart {
cart, ok := getCartStruct(cartid)
if !ok {
return &purchase.Cart{}
}
purchaseCart := purchase.Cart{
Cartid: cart.Cartid,
Status: cart.Status,
}
return &purchaseCart
}
func CloseCart(cartid string) *purchase.Cart {
cartStructWithoutTx, ok := getCartStruct(cartid)
if !ok {
return &purchase.Cart{}
}
_, err := ds.Client.RunInTransaction(context.Background(),
func(tx *datastore.Transaction) error {
var cartStruct ds.Cart
err := tx.Get(cartStructWithoutTx.Key, &cartStruct)
if err != nil {
return err
}
if cartStruct.Status != "open" {
return nil // cannot close
}
cartStruct.Status = "closed"
_, err = tx.Put(cartStruct.Key, &cartStruct)
if err != nil {
return err
}
return nil
})
if err == datastore.ErrNoSuchEntity {
log.Warnf("Cart has been deleted: cartid = ", cartid)
} else if err != nil {
log.Fatalf("Error stroing data: %v", err)
}
return GetCart(cartid)
}
func AddItem(cartid string, itemid string, count int64) []*purchase.CartItem {
cartStructWithoutTx, ok := getCartStruct(cartid)
if !ok {
cartItems := make([]*purchase.CartItem, 0)
return cartItems
}
_, err := ds.Client.RunInTransaction(context.Background(),
func(tx *datastore.Transaction) error {
var cartStruct ds.Cart
err := tx.Get(cartStructWithoutTx.Key, &cartStruct)
if err != nil {
return err
}
if cartStruct.Status != "open" {
return nil // cannot add new items
}
cartItemWithoutTx, ok := getCartItem(cartid, itemid)
if ok {
var cartItem ds.CartItem
err := tx.Get(cartItemWithoutTx.Key, &cartItem)
if err != nil {
return err
}
newCartItem := ds.CartItem{
Itemid: itemid,
Count: cartItem.Count + count,
}
_, err = tx.Put(cartItem.Key, &newCartItem)
} else {
cartItem := ds.CartItem{
Itemid: itemid,
Count: count,
}
cart, _ := getCartStruct(cartid)
err = createEntity("CartItem", &cartItem, cart.Key, nil)
}
if err != nil {
return err
}
return nil
})
if err != nil {
log.Fatalf("Error stroing data: %v", err)
}
cartItems := GetCartContents(cartid)
return cartItems
}
func getCartItems(cartid string) []*ds.CartItem {
cart, ok := getCartStruct(cartid)
cartItems := []*ds.CartItem{}
if !ok {
return cartItems
}
getStructsByParentKey("CartItem", &cartItems, cart.Key)
return cartItems
}
func GetCartContents(cartid string) []*purchase.CartItem {
cartItems := []*purchase.CartItem{}
for _, cartItem := range getCartItems(cartid) {
purchaseCartItem := purchase.CartItem{
Itemid: cartItem.Itemid,
Count: cartItem.Count,
}
cartItems = append(cartItems, &purchaseCartItem)
}
return cartItems
}
func GetOrderTicket(orderid string) *purchase.OrderTicket {
orderTicket, ok := getOrderTicketStruct(orderid)
if !ok {
return &purchase.OrderTicket{}
}
purchaseCartItems := GetCartContents(orderTicket.Cartid)
purchaseOrderTicket := purchase.OrderTicket{
Orderid: orderTicket.Orderid,
Status: orderTicket.Status,
CartItems: purchaseCartItems,
}
return &purchaseOrderTicket
}
func Checkout(cartid string) *purchase.OrderTicket {
purchaseOrderTicket := purchase.OrderTicket{}
cartWithoutTx, ok := getCartStruct(cartid)
if !ok {
log.Warnf("Cart doesn't exist: cartid = ", cartid)
return &purchaseOrderTicket
}
_, err := ds.Client.RunInTransaction(context.Background(),
func(tx *datastore.Transaction) error {
var cart ds.Cart
err := tx.Get(cartWithoutTx.Key, &cart) // Read again within a transaction
if err != nil {
return err
}
if cart.Status != "closed" {
return nil // can't checkout
}
cart.Status = "checked-out"
_, err = tx.Put(cart.Key, &cart)
if err != nil {
return err
}
orderTicket := ds.OrderTicket{
Orderid: getUUID(),
Cartid: cartid,
Status: "pre-approved",
}
err = createEntity("OrderTicket", &orderTicket, nil, tx)
if err != nil {
return err
}
cartContents := GetCartContents(cartid)
purchaseOrderTicket = purchase.OrderTicket{
Orderid: orderTicket.Orderid,
Status: orderTicket.Status,
CartItems: cartContents,
}
err = events.RegisterEvent(purchaseOrderTicket,
"purchase.OrderTicket",
tx)
if err != nil {
return err
}
return nil
})
if err == datastore.ErrNoSuchEntity {
log.Warnf("Cart doesn't exist: cartid = ", cartid)
} else if err != nil {
log.Fatalf("Error stroing data: %v", err)
}
events.PublishEvents()
return &purchaseOrderTicket
}