Go coding skill 1

Implement AddProductToPost, RemoveProductFromPost function to make these tests pass.

Red state(Error)

$ go test ./models -v -test.run TestPost$
=== RUN   TestPost
=== RUN   TestPost/AddProductToPost
    TestPost/AddProductToPost: post_test.go:36:
                Error Trace:    post_test.go:36
                Error:          Not equal:
                                expected: 0
                                actual  : 3
                Test:           TestPost/AddProductToPost
--- FAIL: TestPost (0.01s)
    --- FAIL: TestPost/AddProductToPost (0.00s)
...

Green state(Tests Pass)

go test ./models -v -test.run TestPost$
=== RUN   TestPost
=== RUN   TestPost/AddProductToPost
=== RUN   TestPost/RemoveProductFromPost
--- PASS: TestPost (0.01s)
    --- PASS: TestPost/AddProductToPost (0.00s)
    --- PASS: TestPost/RemoveProductFromPost (0.00s)
PASS
ok      github.com/Blur-Consulting/prismpop-api/models  8.452s

Code to implement:

models/post.go 66 line

func RemoveProductFromPost(ctx context.Context, postId int64, productIds []int64) error {
	return nil
}

func AddProductToPost(ctx context.Context, postId int64, productIds []int64) ([]Product, error) {
	return nil, nil
}

Go coding skill 2

longFunc function执行需要很长时间。请将代码修改为持续执行2秒以上时，强制终止此application。

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	elapsedTime := longFunc()
	fmt.Println(elapsedTime)

}
func longFunc() time.Duration {
	start := time.Now()
	duration := time.Duration(rand.New(rand.NewSource(time.Now().UnixNano())).Intn(5))
	time.Sleep(time.Second * duration)
	return time.Now().Sub(start)
}

Architecture Design

请根据以下要求设计出能够显示page view count的架构。要求: