/
store.ts
135 lines (117 loc) · 2.89 KB
/
store.ts
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
import { Item, User } from '~/types'
export interface StoreState {
items: Record<number, Item>
comments: Record<number, Item[]>
users: Record<number, User>
feeds: Record<string, Record<number, number[]>>
}
export const useStore = () => useState<StoreState>('store', () => ({
items: {},
users: {},
comments: {},
feeds: Object.fromEntries(validFeeds.map(i => [i, {}]))
}))
interface FeedQuery {
feed: string;
page: number
}
export function getFeed (state:StoreState, { feed, page }: FeedQuery) {
const ids = state.feeds?.[feed]?.[page]
if (ids?.length) {
return ids.map(i => state.items[i])
}
return undefined
}
export function fetchFeed (query: FeedQuery) {
const state = $(useStore())
const { feed, page } = query
return reactiveLoad<Item[]>(
() => getFeed(state, query),
(items) => {
const ids = items.map(item => item.id)
state.feeds[feed][page] = ids
items
.filter(Boolean)
.forEach((item) => {
if (state.items[item.id]) {
Object.assign(state.items[item.id], item)
} else {
state.items[item.id] = item
}
})
},
() => $fetch('/api/hn/feeds', { params: { feed, page } }),
(state.feeds[feed][page] || []).map(id => state.items[id])
)
}
export function fetchItem (id: string) {
const state = $(useStore())
return reactiveLoad<Item>(
() => state.items[id],
(item) => { state.items[id] = item },
() => $fetch('/api/hn/item', { params: { id } })
)
}
export function fetchComments (id: string) {
const state = $(useStore())
return reactiveLoad<Item[]>(
() => state.comments[id],
(comments) => { state.comments[id] = comments },
() => $fetch('/api/hn/item', { params: { id } }).then(i => i.comments)
)
}
export function fetchUser (id: string) {
const state = $(useStore())
return reactiveLoad<User>(
() => state.users[id],
(user) => { state.users[id] = user },
() => $fetch('/api/hn/user', { params: { id } })
)
}
/**
* Create reactive state for SWR
*
* On server side the data will be fetched eagerly
*/
export async function reactiveLoad<T> (
get: () => T | undefined,
set: (data: T) => void,
fetch: ()=> Promise<T>,
init?: T
) {
const data = computed({
get,
set
})
const loading = ref(false)
if (data.value == null) {
if (init != null) {
data.value = init
}
const task = async () => {
try {
loading.value = true
const fetched = await fetch()
if (data.value != null) {
data.value = Object.assign(data.value, fetched)
} else {
data.value = fetched
}
} catch (e) {
console.error(e)
data.value = undefined
} finally {
loading.value = false
}
}
if (process.client) {
task()
} else {
await task()
}
}
return reactive({
loading,
data
})
}