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Fix concurrent read/write of map #55

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Fix concurrent read/write of map #55

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21 changes: 16 additions & 5 deletions cookbook/google-app-engine/users.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ package main

import (
"net/http"
"sync"

"github.com/labstack/echo"
"github.com/labstack/echo/middleware"
Expand All @@ -12,14 +13,18 @@ type (
ID string `json:"id"`
Name string `json:"name"`
}
usersMap struct {
sync.RWMutex
users map[string]user
}
)

var (
users map[string]user
usersStore usersMap
)

func init() {
users = map[string]user{
usersStore.users = map[string]user{
"1": user{
ID: "1",
Name: "Wreck-It Ralph",
Expand All @@ -41,14 +46,20 @@ func createUser(c echo.Context) error {
if err := c.Bind(u); err != nil {
return err
}
users[u.ID] = *u
usersStore.Lock()
defer usersStore.Unlock()
usersStore.users[u.ID] = *u
return c.JSON(http.StatusCreated, u)
}

func getUsers(c echo.Context) error {
return c.JSON(http.StatusOK, users)
usersStore.RLock()
defer usersStore.RUnlock()
return c.JSON(http.StatusOK, usersStore.users)
}

func getUser(c echo.Context) error {
return c.JSON(http.StatusOK, users[c.Param("id")])
usersStore.RLock()
defer usersStore.RUnlock()
return c.JSON(http.StatusOK, usersStore.users[c.Param("id")])
}