#!/usr/bin/env python
#
# Public Domain 2014-2018 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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import wiredtiger, wttest
from suite_subprocess import suite_subprocess
from wtdataset import SimpleDataSet, ComplexDataSet
from wiredtiger import stat
from wtscenario import make_scenarios

# test_compact.py
#    session level compact operation
class test_compact(wttest.WiredTigerTestCase, suite_subprocess):
    name = 'test_compact'

    # Use a small page size because we want to create lots of pages.
    config = 'allocation_size=512,' +\
        'leaf_page_max=512,key_format=S'
    nentries = 50000

    # The table is a complex object, give it roughly 5 pages per underlying
    # file.
    types = [
        ('file', dict(type='file:', dataset=SimpleDataSet, maxpages=5)),
        ('table', dict(type='table:', dataset=ComplexDataSet, maxpages=50))
        ]
    compact = [
        ('method', dict(utility=0,reopen=0)),
        ('method_reopen', dict(utility=0,reopen=1)),
        ('utility', dict(utility=1,reopen=0)),
    ]
    scenarios = make_scenarios(types, compact)

    # Configure the connection so that eviction doesn't happen (which could
    # skew our compaction results).
    conn_config = 'cache_size=1GB,eviction_checkpoint_target=80,' +\
        'eviction_dirty_target=80,eviction_dirty_trigger=95,statistics=(all)'

    # Test compaction.
    def test_compact(self):
        # Populate an object
        uri = self.type + self.name
        ds = self.dataset(self, uri, self.nentries - 1, config=self.config)
        ds.populate()

        # Reopen the connection to force the object to disk.
        self.reopen_conn()

        # Confirm the tree starts big
        stat_cursor = self.session.open_cursor('statistics:' + uri, None, None)
        self.assertGreater(stat_cursor[stat.dsrc.btree_row_leaf][2], self.maxpages)
        stat_cursor.close()

        # Remove most of the object.
        c1 = self.session.open_cursor(uri, None)
        c1.set_key(ds.key(5))
        c2 = self.session.open_cursor(uri, None)
        c2.set_key(ds.key(self.nentries - 5))
        self.session.truncate(None, c1, c2, None)
        c1.close()
        c2.close()

        # Compact it, using either the session method or the utility.
        if self.utility == 1:
            self.session.checkpoint(None)
            self.close_conn()
            self.runWt(["compact", uri])
        else:
            # Optionally reopen the connection so we do more on-disk tests.
            if self.reopen == 1:
                self.session.checkpoint(None)
                self.reopen_conn()

            self.session.compact(uri, None)

        # Confirm compaction worked: check the number of on-disk pages
        self.reopen_conn()
        stat_cursor = self.session.open_cursor('statistics:' + uri, None, None)
        self.assertLess(stat_cursor[stat.dsrc.btree_row_leaf][2], self.maxpages)
        stat_cursor.close()

if __name__ == '__main__':
    wttest.run()
