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# frozen_string_literal: true
module AutoExplain
class << self
def setup
Gitlab::Database::EachDatabase.each_connection do |connection|
next unless record_auto_explain?(connection)
connection.execute("LOAD 'auto_explain'")
# This param can only be set on pg14+ so we can't set it when starting postgres.
connection.execute('ALTER SYSTEM SET compute_query_id TO on')
connection.execute('SELECT pg_reload_conf()')
end
end
def record
Gitlab::Database::EachDatabase.each_connection do |connection, connection_name|
next unless record_auto_explain?(connection)
connection.execute(<<~SQL.squish)
CREATE EXTENSION IF NOT EXISTS file_fdw;
CREATE SERVER IF NOT EXISTS pglog FOREIGN DATA WRAPPER file_fdw;
SQL
csvlog_columns = [
'log_time timestamp(3) with time zone',
'user_name text',
'database_name text',
'process_id integer',
'connection_from text',
'session_id text',
'session_line_num bigint',
'command_tag text',
'session_start_time timestamp with time zone',
'virtual_transaction_id text',
'transaction_id bigint',
'error_severity text',
'sql_state_code text',
'message text',
'detail text',
'hint text',
'internal_query text',
'internal_query_pos integer',
'context text',
'query text',
'query_pos integer',
'location text',
'application_name text',
'backend_type text',
'leader_pid integer',
'query_id bigint'
]
connection.transaction do
connection.execute(<<~SQL.squish)
CREATE FOREIGN TABLE IF NOT EXISTS pglog (#{csvlog_columns.join(', ')})
SERVER pglog
OPTIONS ( filename 'log/pglog.csv', format 'csv' );
SQL
log_file = Rails.root.join(
File.dirname(ENV.fetch('RSPEC_AUTO_EXPLAIN_LOG_PATH', 'auto_explain/auto_explain.ndjson.gz')),
"#{ENV.fetch('CI_JOB_NAME_SLUG', 'rspec')}.#{Process.pid}.#{connection_name}.ndjson.gz"
)
FileUtils.mkdir_p(File.dirname(log_file))
fingerprints = Set.new
recording_start = Time.now
Zlib::GzipWriter.open(log_file) do |gz|
pg = connection.raw_connection
pg.exec('SET statement_timeout TO 0;')
pg.send_query(<<~SQL.squish)
SELECT DISTINCT ON (m.query_id)
m.message->>'Query Text' as query, m.message->'Plan' as plan
FROM (
SELECT substring(message from '\{.*$')::jsonb AS message, query_id
FROM pglog
WHERE message LIKE '%{%'
) m
ORDER BY m.query_id;
SQL
pg.set_single_row_mode
pg.get_result.stream_each do |row|
query = row['query']
fingerprint = PgQuery.fingerprint(query)
next unless fingerprints.add?(fingerprint)
plan = Gitlab::Json.parse(row['plan'])
output = {
query: query,
plan: plan,
fingerprint: fingerprint,
normalized: PgQuery.normalize(query)
}
gz.puts Gitlab::Json.generate(output)
end
puts "auto_explain log contains #{fingerprints.size} entries for #{connection_name}, writing to #{log_file}"
puts "took #{Time.now - recording_start}"
end
raise ActiveRecord::Rollback
end
end
end
private
def record_auto_explain?(connection)
return false unless ENV['CI']
return false if ENV['CI_JOB_NAME_SLUG'] == 'db-migrate-non-superuser'
return false if connection.database_version.to_s[0..1].to_i < 14
return false if connection.select_one('SHOW is_superuser')['is_superuser'] != 'on'
return false if connection.select_one('SELECT pg_stat_file(\'log/pglog.csv\', true)')['pg_stat_file'].nil?
# This condition matches the pipeline rules for if-merge-request
return true if %w[detached merged_result].include?(ENV['CI_MERGE_REQUEST_EVENT_TYPE'])
# This condition matches the pipeline rules for if-default-branch-refs
ENV['CI_COMMIT_REF_NAME'] == ENV['CI_DEFAULT_BRANCH'] && !ENV['CI_MERGE_REQUEST_IID']
end
end
end
RSpec.configure do |config|
config.before(:suite) do
AutoExplain.setup
end
config.after(:suite) do
AutoExplain.record
end
end
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