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|
# frozen_string_literal: true
class AccountSearchService < BaseService
attr_reader :query, :limit, :offset, :options, :account
MENTION_ONLY_RE = /\A#{Account::MENTION_RE}\z/i
# 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?(MENTION_ONLY_RE)
end
def likely_acct?
@acct_hint || username_complete?
end
end
|
