61 lines
2.0 KiB
Python
61 lines
2.0 KiB
Python
# Data for log.py, describes the format of log records
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# There are a small number of main log record types.
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#
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# Some log record types, such as transaction commit, also include a list of
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# "log operations" within the same log record. Both log record types and log
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# operations are described here.
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class LogRecordType:
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def __init__(self, name, fields):
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self.name = name
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self.fields = fields
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def macro_name(self):
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return 'WT_LOGREC_%s' % self.name.upper()
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def prname(self):
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return '__logrec_print_' + self.name
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rectypes = [
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# A database-wide checkpoint.
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LogRecordType('checkpoint', [
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('WT_LSN', 'ckpt_lsn'), ('uint32', 'nsnapshot'), ('item', 'snapshot')]),
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# Common case: a transaction commit
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LogRecordType('commit', [('uint64', 'txnid')]),
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# Debugging message in the log
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LogRecordType('debug', [('string', 'message')]),
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# Mark the start / end of a file sync operation (usually when a file is
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# closed). These log records aren't required during recovery, but we use
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# the allocated LSN to reduce the amount of work recovery has to do, and
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# they are useful for debugging recovery.
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LogRecordType('file_sync', [('uint32', 'fileid'), ('int', 'start')]),
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]
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class LogOperationType:
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def __init__(self, name, fields):
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self.name = name
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self.fields = fields
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def macro_name(self):
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return 'WT_LOGOP_%s' % self.name.upper()
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optypes = [
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LogOperationType('col_put',
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[('uint32', 'fileid'), ('recno', 'recno'), ('item', 'value')]),
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LogOperationType('col_remove',
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[('uint32', 'fileid'), ('recno', 'recno')]),
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LogOperationType('col_truncate',
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[('uint32', 'fileid'), ('recno', 'start'), ('recno', 'stop')]),
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LogOperationType('row_put',
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[('uint32', 'fileid'), ('item', 'key'), ('item', 'value')]),
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LogOperationType('row_remove',
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[('uint32', 'fileid'), ('item', 'key')]),
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LogOperationType('row_truncate',
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[('uint32', 'fileid'), ('item', 'start'), ('item', 'stop'),
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('uint32', 'mode')]),
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]
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