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46 lines
1.7 KiB
46 lines
1.7 KiB
4 years ago
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require 'active_support/core_ext'
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require_relative 'db/sanitize.rb'
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module Carto
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class ValidTableNameProposer
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DEFAULT_SEPARATOR = '_'.freeze
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DEFAULT_TABLE_NAME = 'untitled_table'.freeze
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MAX_RENAME_RETRIES = 10000
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NON_COLLISIONABLE_STRING_LENGTH = 61
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def propose_valid_table_name(contendent = DEFAULT_TABLE_NAME.dup, taken_names:)
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contendent = DEFAULT_TABLE_NAME.dup unless contendent.present?
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sanitized_contendent = Carto::DB::Sanitize.sanitize_identifier(contendent)
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used_table_names = taken_names +
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Carto::DB::Sanitize::SYSTEM_TABLE_NAMES +
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Carto::DB::Sanitize::RESERVED_TABLE_NAMES
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find_unused_name_with_prefix(used_table_names, sanitized_contendent)
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end
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private
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def find_unused_name_with_prefix(names, prefix, separator: DEFAULT_SEPARATOR)
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proposal = prefix
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(1..MAX_RENAME_RETRIES).each do |appendix|
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# We exclude the proposal either if the taken names array already have the proposal, or if the taken names
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# array contains a string with the first 62 chars equal to the proposal. With this we avoid typnames collision
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# when moving schemas
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return proposal unless names.any? { |name| name_can_have_typname_collision(name, proposal) }
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proposal = Carto::DB::Sanitize.append_with_truncate_and_sanitize(prefix, "#{separator}#{appendix}")
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end
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CartoDB::Logger.error(message: 'Physical tables: Out of rename retries', table_name: prefix)
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raise "Out of retries (#{MAX_RENAME_RETRIES}) renaming #{proposal}"
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end
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def name_can_have_typname_collision(name, proposal)
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name == proposal || name[0..NON_COLLISIONABLE_STRING_LENGTH] == proposal[0..NON_COLLISIONABLE_STRING_LENGTH]
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end
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end
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end
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