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
|
import {
AppBskyActorDefs,
AppBskyGraphGetFollows as GetFollows,
} from '@atproto/api'
import {makeAutoObservable, runInAction} from 'mobx'
import sampleSize from 'lodash.samplesize'
import {bundleAsync} from 'lib/async/bundle'
import {RootStoreModel} from '../root-store'
export type RefWithInfoAndFollowers = AppBskyActorDefs.ProfileViewBasic & {
followers: AppBskyActorDefs.ProfileView[]
}
export type ProfileViewFollows = AppBskyActorDefs.ProfileView & {
follows: AppBskyActorDefs.ProfileViewBasic[]
}
export class FoafsModel {
isLoading = false
hasData = false
sources: string[] = []
foafs: Map<string, ProfileViewFollows> = new Map() // FOAF stands for Friend of a Friend
popular: RefWithInfoAndFollowers[] = []
constructor(public rootStore: RootStoreModel) {
makeAutoObservable(this)
}
get hasContent() {
if (this.popular.length > 0) {
return true
}
for (const foaf of this.foafs.values()) {
if (foaf.follows.length) {
return true
}
}
return false
}
fetch = bundleAsync(async () => {
try {
this.isLoading = true
// fetch & hydrate up to 1000 follows
{
let cursor
for (let i = 0; i < 10; i++) {
const res: GetFollows.Response =
await this.rootStore.agent.getFollows({
actor: this.rootStore.me.did,
cursor,
limit: 100,
})
this.rootStore.me.follows.hydrateProfiles(res.data.follows)
if (!res.data.cursor) {
break
}
cursor = res.data.cursor
}
}
// grab 10 of the users followed by the user
runInAction(() => {
this.sources = sampleSize(
Object.keys(this.rootStore.me.follows.followDidToRecordMap),
10,
)
})
if (this.sources.length === 0) {
return
}
runInAction(() => {
this.foafs.clear()
this.popular.length = 0
})
// fetch their profiles
const profiles = await this.rootStore.agent.getProfiles({
actors: this.sources,
})
// fetch their follows
const results = await Promise.allSettled(
this.sources.map(source =>
this.rootStore.agent.getFollows({actor: source}),
),
)
// store the follows and construct a "most followed" set
const popular: RefWithInfoAndFollowers[] = []
for (let i = 0; i < results.length; i++) {
const res = results[i]
if (res.status === 'fulfilled') {
this.rootStore.me.follows.hydrateProfiles(res.value.data.follows)
}
const profile = profiles.data.profiles[i]
const source = this.sources[i]
if (res.status === 'fulfilled' && profile) {
// filter out users already followed by the user or that *is* the user
res.value.data.follows = res.value.data.follows.filter(follow => {
return (
follow.did !== this.rootStore.me.did && !follow.viewer?.following
)
})
runInAction(() => {
this.foafs.set(source, {
...profile,
follows: res.value.data.follows,
})
})
for (const follow of res.value.data.follows) {
let item = popular.find(p => p.did === follow.did)
if (!item) {
item = {...follow, followers: []}
popular.push(item)
}
item.followers.push(profile)
}
}
}
popular.sort((a, b) => b.followers.length - a.followers.length)
runInAction(() => {
this.popular = popular.filter(p => p.followers.length > 1).slice(0, 20)
})
this.hasData = true
} catch (e) {
console.error('Failed to fetch FOAFs', e)
} finally {
runInAction(() => {
this.isLoading = false
})
}
})
}
|
