-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
107 lines (84 loc) · 2.21 KB
/
main.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
package main
import (
"context"
"fmt"
"net/http"
"github.com/labstack/echo/v4"
"github.com/smiletrl/go_jaeger_tracing/pkg/constants"
"github.com/smiletrl/go_jaeger_tracing/pkg/tracing"
productClient "github.com/smiletrl/go_jaeger_tracing/service.product/external"
)
func main() {
// echo instance
e := echo.New()
tracingProvider := tracing.NewProvider()
closer, err := tracingProvider.SetupTracer("cart", constants.TracingEndpoint, constants.Stage)
if err != nil {
panic(err)
}
defer closer.Close()
// middleware
e.Use(tracingProvider.Middleware())
// product grpc client.
pclient, err := productClient.NewClient(constants.GrpcProductHost, tracingProvider)
if err != nil {
panic(err)
}
productProxy := product{pclient}
r := resource{tracingProvider, productProxy}
group := e.Group("/api/v1")
group.POST("/cart", r.Create)
// start server
if err = e.Start(":1325"); err != nil {
panic(err)
}
}
/* ----- resource ------ */
type resource struct {
tracing tracing.Provider
productProxy ProductProxy
}
type createRequest struct {
Quantity int `json:"quantity"`
SkuID string `json:"sku_id"`
}
func (r resource) Create(c echo.Context) error {
ctx := c.Request().Context()
req := new(createRequest)
if err := c.Bind(req); err != nil {
panic(err)
}
// get product sku stock
stock, err := r.productProxy.GetSkuStock(ctx, req.SkuID)
if err != nil {
panic(err)
}
if stock < req.Quantity {
panic(err)
}
// save the cart data into database.
if err = SaveCart(ctx, req.SkuID, req.Quantity, r.tracing); err != nil {
panic(err)
}
return c.String(http.StatusOK, "ok")
}
/* -- product proxy --- */
type ProductProxy interface {
GetSkuStock(c context.Context, skuID string) (int, error)
}
// product proxy
type product struct {
client productClient.Client
}
func (p product) GetSkuStock(c context.Context, skuID string) (int, error) {
return p.client.GetSkuStock(c, skuID)
}
/* ---- database --- */
func SaveCart(c context.Context, skuID string, quantity int, tracing tracing.Provider) error {
// save it to redis/postgres
span, ctx := tracing.StartSpan(c, "cart item create")
defer tracing.FinishSpan(span)
// pass ctx to db related functions.
fmt.Println(ctx)
return nil
}