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
138
139
140
141
142
|
# frozen_string_literal: true
class Trends::Statuses < Trends::Base
PREFIX = 'trending_statuses'
self.default_options = {
threshold: 5,
review_threshold: 3,
score_halflife: 2.hours.freeze,
}
class Query < Trends::Query
def filtered_for!(account)
@account = account
self
end
def filtered_for(account)
clone.filtered_for!(account)
end
private
def apply_scopes(scope)
scope.includes(:account)
end
def perform_queries
return super if @account.nil?
statuses = super
account_ids = statuses.map(&:account_id)
account_domains = statuses.map(&:account_domain)
preloaded_relations = {
blocking: Account.blocking_map(account_ids, @account.id),
blocked_by: Account.blocked_by_map(account_ids, @account.id),
muting: Account.muting_map(account_ids, @account.id),
following: Account.following_map(account_ids, @account.id),
domain_blocking_by_domain: Account.domain_blocking_map_by_domain(account_domains, @account.id),
}
statuses.reject { |status| StatusFilter.new(status, @account, preloaded_relations).filtered? }
end
end
def register(status, at_time = Time.now.utc)
add(status.proper, status.account_id, at_time) if eligible?(status)
end
def add(status, _account_id, at_time = Time.now.utc)
# We rely on the total reblogs and favourites count, so we
# don't record which account did the what and when here
record_used_id(status.id, at_time)
end
def query
Query.new(key_prefix, klass)
end
def refresh(at_time = Time.now.utc)
statuses = Status.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq).includes(:account, :media_attachments)
calculate_scores(statuses, at_time)
trim_older_items
end
def request_review
statuses = Status.where(id: currently_trending_ids(false, -1)).includes(:account)
statuses.filter_map do |status|
next unless would_be_trending?(status.id) && !status.trendable? && status.requires_review_notification?
status.account.touch(:requested_review_at)
status
end
end
protected
def key_prefix
PREFIX
end
def klass
Status
end
private
def eligible?(status)
original_status = status.proper
original_status.public_visibility? &&
original_status.account.discoverable? && !original_status.account.silenced? &&
(original_status.spoiler_text.blank? || Setting.trending_status_cw) && !original_status.sensitive? && !original_status.reply?
end
def calculate_scores(statuses, at_time)
redis.pipelined do
statuses.each do |status|
expected = 1.0
observed = (status.reblogs_count + status.favourites_count).to_f
score = begin
if expected > observed || observed < options[:threshold]
0
else
((observed - expected)**2) / expected
end
end
decaying_score = score * (0.5**((at_time.to_f - status.created_at.to_f) / options[:score_halflife].to_f))
add_to_and_remove_from_subsets(status.id, decaying_score, {
all: true,
allowed: status.trendable? && status.account.discoverable?,
})
next unless valid_locale?(status.language)
add_to_and_remove_from_subsets(status.id, decaying_score, {
"all:#{status.language}" => true,
"allowed:#{status.language}" => status.trendable? && status.account.discoverable?,
})
end
# Clean up localized sets by calculating the intersection with the main
# set. We do this instead of just deleting the localized sets to avoid
# having moments where the API returns empty results
Trends.available_locales.each do |locale|
redis.zinterstore("#{key_prefix}:all:#{locale}", ["#{key_prefix}:all:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
redis.zinterstore("#{key_prefix}:allowed:#{locale}", ["#{key_prefix}:allowed:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
end
end
end
def would_be_trending?(id)
score(id) > score_at_rank(options[:review_threshold] - 1)
end
end
|
