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Checksum ordered by update #102

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merged 3 commits into from
Dec 19, 2023
Merged

Checksum ordered by update #102

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eb76a52
Update ordered_by
ericaporter Dec 17, 2023
f113352
Reduce duplication in methods
ericaporter Dec 18, 2023
b6eb3c0
Add order_column into perform, update specs
ericaporter Dec 18, 2023
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31 changes: 22 additions & 9 deletions lib/dfe/analytics/entity_table_check_job.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -61,38 +61,51 @@ def fetch_current_timestamp_in_time_zone
end

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I think we should make a method for checking existence of id column and call this from the perform method loop.

def id_column_exists_for_entity?(entity)
  return true if ActiveRecord::Base.connection.column_exists?(entity, :id)

  Rails.logger.info("DfE::Analytics: Entity checksum: ID column missing in #{entity} - Skipping checks")

  false
end

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Good plan, updates made. Ready for another review - so much complexity in this job now!

def fetch_checksum_data(entity, checksum_calculated_at)
return [0, ''] unless ActiveRecord::Base.connection.column_exists?(entity, :id)

table_name_sanitized = ActiveRecord::Base.connection.quote_table_name(entity)
checksum_calculated_at_sanitized = ActiveRecord::Base.connection.quote(checksum_calculated_at)
order_column = determine_order_column(entity)

if adapter_name == 'postgresql'
fetch_postgresql_checksum_data(table_name_sanitized, checksum_calculated_at_sanitized)
fetch_postgresql_checksum_data(table_name_sanitized, checksum_calculated_at_sanitized, order_column)
else
fetch_generic_checksum_data(table_name_sanitized, checksum_calculated_at_sanitized, order_column)
end
end

def determine_order_column(entity)
if ActiveRecord::Base.connection.column_exists?(entity, :updated_at)
'UPDATED_AT'
elsif ActiveRecord::Base.connection.column_exists?(entity, :created_at)
'CREATED_AT'
else
fetch_generic_checksum_data(table_name_sanitized, checksum_calculated_at_sanitized)
'ID'
end
end

def fetch_postgresql_checksum_data(table_name_sanitized, checksum_calculated_at_sanitized)
def fetch_postgresql_checksum_data(table_name_sanitized, checksum_calculated_at_sanitized, order_column)
checksum_sql_query = <<-SQL
SELECT COUNT(*) as row_count,
MD5(COALESCE(STRING_AGG(CHECKSUM_TABLE.ID, '' ORDER BY CHECKSUM_TABLE.UPDATED_AT ASC), '')) as checksum
MD5(COALESCE(STRING_AGG(CHECKSUM_TABLE.ID, '' ORDER BY CHECKSUM_TABLE.#{order_column} ASC), '')) as checksum
FROM (
SELECT #{table_name_sanitized}.id::TEXT as ID,
#{table_name_sanitized}.updated_at as UPDATED_AT
#{table_name_sanitized}.#{order_column} as #{order_column}
FROM #{table_name_sanitized}
WHERE #{table_name_sanitized}.updated_at < #{checksum_calculated_at_sanitized}
WHERE #{table_name_sanitized}.#{order_column} < #{checksum_calculated_at_sanitized}
) CHECKSUM_TABLE
SQL

result = ActiveRecord::Base.connection.execute(checksum_sql_query).first
[result['row_count'].to_i, result['checksum']]
end

def fetch_generic_checksum_data(table_name_sanitized, checksum_calculated_at_sanitized)
def fetch_generic_checksum_data(table_name_sanitized, checksum_calculated_at_sanitized, order_column)
checksum_sql_query = <<-SQL
SELECT #{table_name_sanitized}.ID
FROM #{table_name_sanitized}
WHERE #{table_name_sanitized}.UPDATED_AT < #{checksum_calculated_at_sanitized}
ORDER BY #{table_name_sanitized}.UPDATED_AT ASC
WHERE #{table_name_sanitized}.#{order_column} < #{checksum_calculated_at_sanitized}
ORDER BY #{table_name_sanitized}.#{order_column} ASC
SQL

table_ids = ActiveRecord::Base.connection.execute(checksum_sql_query).pluck('id')
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