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Fix old migration script not being able to run if it fails midway (#15361)

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* Fix old migration script not being able to run if it fails midway

Improve the robustness of a migration script likely to fail because of database
corruption so it can run again once database corruptions are fixed.

* Display a specific error message in case of index corruption

Co-authored-by: Eugen Rochko <eugen@zeonfederated.com>
Co-authored-by: Claire <claire.github-309c@sitedethib.com>
This commit is contained in:
ThibG 2020-12-18 17:51:24 +01:00 committed by GitHub
parent 1a02882244
commit 052249588b
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1 changed files with 23 additions and 3 deletions
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26
db/migrate/20200620164023_add_fixed_lowercase_index_to_accounts.rb
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@ -1,10 +1,30 @@
class AddFixedLowercaseIndexToAccounts < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
class CorruptionError < StandardError
def cause
nil
end
def backtrace
[]
end
end
def up
rename_index :accounts, 'index_accounts_on_username_and_domain_lower', 'old_index_accounts_on_username_and_domain_lower' unless index_name_exists?(:accounts, 'old_index_accounts_on_username_and_domain_lower')
add_index :accounts, "lower (username), COALESCE(lower(domain), '')", name: 'index_accounts_on_username_and_domain_lower', unique: true, algorithm: :concurrently
remove_index :accounts, name: 'old_index_accounts_on_username_and_domain_lower'
if index_name_exists?(:accounts, 'old_index_accounts_on_username_and_domain_lower') && index_name_exists?(:accounts, 'index_accounts_on_username_and_domain_lower')
remove_index :accounts, name: 'index_accounts_on_username_and_domain_lower'
elsif index_name_exists?(:accounts, 'index_accounts_on_username_and_domain_lower')
rename_index :accounts, 'index_accounts_on_username_and_domain_lower', 'old_index_accounts_on_username_and_domain_lower'
end
begin
add_index :accounts, "lower (username), COALESCE(lower(domain), '')", name: 'index_accounts_on_username_and_domain_lower', unique: true, algorithm: :concurrently
rescue ActiveRecord::RecordNotUnique
raise CorruptionError, 'Migration failed because of index corruption, see https://docs.joinmastodon.org/admin/troubleshooting/index-corruption/#fixing'
end
remove_index :accounts, name: 'old_index_accounts_on_username_and_domain_lower' if index_name_exists?(:accounts, 'old_index_accounts_on_username_and_domain_lower')
end
def down