about summary refs log tree commit diff
path: root/app/services/account_search_service.rb
blob: 9f2330a9476527fc4a17e3f9114e19168a43bdf8 (plain) (blame)
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
# frozen_string_literal: true

class AccountSearchService < BaseService
  attr_reader :query, :limit, :offset, :options, :account

  # Min. number of characters to look for non-exact matches
  MIN_QUERY_LENGTH = 5

  def call(query, account = nil, options = {})
    @acct_hint = query&.start_with?('@')
    @query     = query&.strip&.gsub(/\A@/, '')
    @limit     = options[:limit].to_i
    @offset    = options[:offset].to_i
    @options   = options
    @account   = account

    search_service_results.compact.uniq
  end

  private

  def search_service_results
    return [] if query.blank? || limit < 1

    [exact_match] + search_results
  end

  def exact_match
    return unless offset.zero? && username_complete?

    return @exact_match if defined?(@exact_match)

    match = begin
      if options[:resolve]
        ResolveAccountService.new.call(query)
      elsif domain_is_local?
        Account.find_local(query_username)
      else
        Account.find_remote(query_username, query_domain)
      end
    end

    match = nil if !match.nil? && !account.nil? && options[:following] && !account.following?(match)

    @exact_match = match
  end

  def search_results
    return [] if limit_for_non_exact_results.zero?

    @search_results ||= begin
      results = from_elasticsearch if Chewy.enabled?
      results ||= from_database
      results
    end
  end

  def from_database
    if account
      advanced_search_results
    else
      simple_search_results
    end
  end

  def advanced_search_results
    Account.advanced_search_for(terms_for_query, account, limit: limit_for_non_exact_results, following: options[:following], offset: offset)
  end

  def simple_search_results
    Account.search_for(terms_for_query, limit: limit_for_non_exact_results, offset: offset)
  end

  def from_elasticsearch
    must_clauses   = [{ multi_match: { query: terms_for_query, fields: likely_acct? ? %w(acct.edge_ngram acct) : %w(acct.edge_ngram acct display_name.edge_ngram display_name), type: 'most_fields', operator: 'and' } }]
    should_clauses = []

    if account
      return [] if options[:following] && following_ids.empty?

      if options[:following]
        must_clauses << { terms: { id: following_ids } }
      elsif following_ids.any?
        should_clauses << { terms: { id: following_ids, boost: 100 } }
      end
    end

    query     = { bool: { must: must_clauses, should: should_clauses } }
    functions = [reputation_score_function, followers_score_function, time_distance_function]

    records = AccountsIndex.query(function_score: { query: query, functions: functions, boost_mode: 'multiply', score_mode: 'avg' })
                           .limit(limit_for_non_exact_results)
                           .offset(offset)
                           .objects
                           .compact

    ActiveRecord::Associations::Preloader.new.preload(records, :account_stat)

    records
  rescue Faraday::ConnectionFailed, Parslet::ParseFailed
    nil
  end

  def reputation_score_function
    {
      script_score: {
        script: {
          source: "(Math.max(doc['followers_count'].value, 0) + 0.0) / (Math.max(doc['followers_count'].value, 0) + Math.max(doc['following_count'].value, 0) + 1)",
        },
      },
    }
  end

  def followers_score_function
    {
      script_score: {
        script: {
          source: "Math.log10(Math.max(doc['followers_count'].value, 0) + 2)",
        },
      },
    }
  end

  def time_distance_function
    {
      gauss: {
        last_status_at: {
          scale: '30d',
          offset: '30d',
          decay: 0.3,
        },
      },
    }
  end

  def following_ids
    @following_ids ||= account.active_relationships.pluck(:target_account_id) + [account.id]
  end

  def limit_for_non_exact_results
    return 0 if @account.nil? && query.size < MIN_QUERY_LENGTH

    if exact_match?
      limit - 1
    else
      limit
    end
  end

  def terms_for_query
    if domain_is_local?
      query_username
    else
      query
    end
  end

  def split_query_string
    @split_query_string ||= query.split('@')
  end

  def query_username
    @query_username ||= split_query_string.first || ''
  end

  def query_domain
    @query_domain ||= query_without_split? ? nil : split_query_string.last
  end

  def query_without_split?
    split_query_string.size == 1
  end

  def domain_is_local?
    @domain_is_local ||= TagManager.instance.local_domain?(query_domain)
  end

  def exact_match?
    exact_match.present?
  end

  def username_complete?
    query.include?('@') && "@#{query}".match?(/\A#{Account::MENTION_RE}\Z/)
  end

  def likely_acct?
    @acct_hint || username_complete?
  end
end