84 lines
3.6 KiB
Ruby
84 lines
3.6 KiB
Ruby
class RemoveSegments < ActiveRecord::Migration[4.2]
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def self.up
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have_segs = select_value("SELECT count(*) FROM current_segments").to_i.nonzero?
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if have_segs
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prefix = File.join Dir.tmpdir, "008_remove_segments.#{$PROCESS_ID}."
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cmd = "db/migrate/008_remove_segments_helper"
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src = "#{cmd}.cc"
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if !File.exist?(cmd) || File.mtime(cmd) < File.mtime(src)
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system("c++ -O3 -Wall `mysql_config --cflags --libs` " \
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"#{src} -o #{cmd}") || raise
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end
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conn_opts = ApplicationRecord.connection
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.instance_eval { @connection_options }
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args = conn_opts.map(&:to_s) + [prefix]
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raise "#{cmd} failed" unless system cmd, *args
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tempfiles = %w[ways way_nodes way_tags relations relation_members relation_tags]
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.map { |base| prefix + base }
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ways, way_nodes, way_tags,
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relations, relation_members, relation_tags = tempfiles
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end
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drop_table :segments
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drop_table :way_segments
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create_table :way_nodes, :id => false do |t|
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t.column :id, :bigint, :null => false
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t.column :node_id, :bigint, :null => false
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t.column :version, :bigint, :null => false
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t.column :sequence_id, :bigint, :null => false
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end
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add_primary_key :way_nodes, [:id, :version, :sequence_id]
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drop_table :current_segments
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drop_table :current_way_segments
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create_table :current_way_nodes, :id => false do |t|
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t.column :id, :bigint, :null => false
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t.column :node_id, :bigint, :null => false
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t.column :sequence_id, :bigint, :null => false
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end
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add_primary_key :current_way_nodes, [:id, :sequence_id]
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add_index :current_way_nodes, [:node_id], :name => "current_way_nodes_node_idx"
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execute "TRUNCATE way_tags"
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execute "TRUNCATE ways"
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execute "TRUNCATE current_way_tags"
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execute "TRUNCATE current_ways"
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# now get the data back
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csvopts = "FIELDS TERMINATED BY ',' ENCLOSED BY '\"' ESCAPED BY '\"' LINES TERMINATED BY '\\n'"
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tempfiles.each { |fn| File.chmod 0o644, fn } if have_segs
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if have_segs
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execute "LOAD DATA INFILE '#{ways}' INTO TABLE ways #{csvopts} (id, user_id, timestamp) SET visible = 1, version = 1"
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execute "LOAD DATA INFILE '#{way_nodes}' INTO TABLE way_nodes #{csvopts} (id, node_id, sequence_id) SET version = 1"
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execute "LOAD DATA INFILE '#{way_tags}' INTO TABLE way_tags #{csvopts} (id, k, v) SET version = 1"
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execute "INSERT INTO current_ways SELECT id, user_id, timestamp, visible FROM ways"
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execute "INSERT INTO current_way_nodes SELECT id, node_id, sequence_id FROM way_nodes"
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execute "INSERT INTO current_way_tags SELECT id, k, v FROM way_tags"
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end
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if have_segs
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execute "LOAD DATA INFILE '#{relations}' INTO TABLE relations #{csvopts} (id, user_id, timestamp) SET visible = 1, version = 1"
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execute "LOAD DATA INFILE '#{relation_members}' INTO TABLE relation_members #{csvopts} (id, member_type, member_id, member_role) SET version = 1"
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execute "LOAD DATA INFILE '#{relation_tags}' INTO TABLE relation_tags #{csvopts} (id, k, v) SET version = 1"
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# FIXME: This will only work if there were no relations before the
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# migration!
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execute "INSERT INTO current_relations SELECT id, user_id, timestamp, visible FROM relations"
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execute "INSERT INTO current_relation_members SELECT id, member_type, member_id, member_role FROM relation_members"
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execute "INSERT INTO current_relation_tags SELECT id, k, v FROM relation_tags"
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end
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tempfiles.each { |fn| File.unlink fn } if have_segs
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end
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def self.down
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raise ActiveRecord::IrreversibleMigration
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end
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end
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