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# File 'lib/pgsync/table_sync.rb', line 14
def sync(mutex, config, table, opts, source_url, destination_url)
source = DataSource.new(source_url)
destination = DataSource.new(destination_url)
from_connection = source.conn
to_connection = destination.conn
begin
bad_fields = opts[:no_rules] ? [] : config["data_rules"]
from_fields = source.columns(table)
to_fields = destination.columns(table)
shared_fields = to_fields & from_fields
= to_fields - from_fields
missing_fields = from_fields - to_fields
from_sequences = source.sequences(table, shared_fields)
to_sequences = destination.sequences(table, shared_fields)
shared_sequences = to_sequences & from_sequences
= to_sequences - from_sequences
missing_sequences = from_sequences - to_sequences
sql_clause = String.new
mutex.synchronize do
log "* Syncing #{table}"
if opts[:sql]
log " #{opts[:sql]}"
sql_clause << " #{opts[:sql]}"
end
log " Extra columns: #{extra_fields.join(", ")}" if .any?
log " Missing columns: #{missing_fields.join(", ")}" if missing_fields.any?
log " Extra sequences: #{extra_sequences.join(", ")}" if .any?
log " Missing sequences: #{missing_sequences.join(", ")}" if missing_sequences.any?
if shared_fields.empty?
log " No fields to copy"
end
end
if shared_fields.any?
copy_fields = shared_fields.map { |f| f2 = bad_fields.to_a.find { |bf, bk| rule_match?(table, f, bf) }; f2 ? "#{apply_strategy(f2[1], table, f)} AS #{quote_ident(f)}" : "#{quote_ident_full(table)}.#{quote_ident(f)}" }.join(", ")
fields = shared_fields.map { |f| quote_ident(f) }.join(", ")
seq_values = {}
shared_sequences.each do |seq|
seq_values[seq] = source.last_value(seq)
end
copy_to_command = "COPY (SELECT #{copy_fields} FROM #{quote_ident_full(table)}#{sql_clause}) TO STDOUT"
if opts[:in_batches]
raise PgSync::Error, "Cannot use --overwrite with --in-batches" if opts[:overwrite]
primary_key = source.primary_key(table)
raise PgSync::Error, "No primary key" unless primary_key
destination.truncate(table) if opts[:truncate]
from_max_id = source.max_id(table, primary_key)
to_max_id = destination.max_id(table, primary_key) + 1
if to_max_id == 1
from_min_id = source.min_id(table, primary_key)
to_max_id = from_min_id if from_min_id > 0
end
starting_id = to_max_id
batch_size = opts[:batch_size]
i = 1
batch_count = ((from_max_id - starting_id + 1) / batch_size.to_f).ceil
while starting_id <= from_max_id
where = "#{quote_ident(primary_key)} >= #{starting_id} AND #{quote_ident(primary_key)} < #{starting_id + batch_size}"
log " #{i}/#{batch_count}: #{where}"
batch_sql_clause = " #{sql_clause.length > 0 ? "#{sql_clause} AND" : "WHERE"} #{where}"
batch_copy_to_command = "COPY (SELECT #{copy_fields} FROM #{quote_ident_full(table)}#{batch_sql_clause}) TO STDOUT"
to_connection.copy_data "COPY #{quote_ident_full(table)} (#{fields}) FROM STDIN" do
from_connection.copy_data batch_copy_to_command do
while row = from_connection.get_copy_data
to_connection.put_copy_data(row)
end
end
end
starting_id += batch_size
i += 1
if opts[:sleep] && starting_id <= from_max_id
sleep(opts[:sleep])
end
end
elsif !opts[:truncate] && (opts[:overwrite] || opts[:preserve] || !sql_clause.empty?)
primary_key = destination.primary_key(table)
raise PgSync::Error, "No primary key" unless primary_key
temp_table = "pgsync_#{rand(1_000_000_000)}"
file = Tempfile.new(temp_table)
begin
from_connection.copy_data copy_to_command do
while row = from_connection.get_copy_data
file.write(row)
end
end
file.rewind
to_connection.exec("CREATE TEMPORARY TABLE #{quote_ident_full(temp_table)} AS SELECT * FROM #{quote_ident_full(table)} WITH NO DATA")
to_connection.copy_data "COPY #{quote_ident_full(temp_table)} (#{fields}) FROM STDIN" do
file.each do |row|
to_connection.put_copy_data(row)
end
end
if opts[:preserve]
to_connection.exec("INSERT INTO #{quote_ident_full(table)} (SELECT * FROM #{quote_ident_full(temp_table)} WHERE NOT EXISTS (SELECT 1 FROM #{quote_ident_full(table)} WHERE #{quote_ident_full(table)}.#{primary_key} = #{quote_ident_full(temp_table)}.#{quote_ident(primary_key)}))")
else
to_connection.transaction do
to_connection.exec("DELETE FROM #{quote_ident_full(table)} WHERE #{quote_ident(primary_key)} IN (SELECT #{quote_ident(primary_key)} FROM #{quote_ident_full(temp_table)})")
to_connection.exec("INSERT INTO #{quote_ident_full(table)} (SELECT * FROM #{quote_ident(temp_table)})")
end
end
ensure
file.close
file.unlink
end
else
destination.truncate(table)
to_connection.copy_data "COPY #{quote_ident_full(table)} (#{fields}) FROM STDIN" do
from_connection.copy_data copy_to_command do
while row = from_connection.get_copy_data
to_connection.put_copy_data(row)
end
end
end
end
seq_values.each do |seq, value|
to_connection.exec("SELECT setval(#{escape(seq)}, #{escape(value)})")
end
end
ensure
source.close
destination.close
end
end
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