#!/usr/bin/env python
#
# Public Domain 2014-2016 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
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# distribute this software, either in source code form or as a compiled
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# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
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# software under copyright law.
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#
# test_compress01.py
#   Basic block compression operations
#

import os, run
import wiredtiger, wttest
from wtscenario import make_scenarios

# Test basic compression
class test_compress01(wttest.WiredTigerTestCase):

    types = [
        ('file', dict(uri='file:test_compress01')),
        ('table', dict(uri='table:test_compress01')),
    ]
    compress = [
        ('nop', dict(compress='nop')),
        ('snappy', dict(compress='snappy')),
        ('none', dict(compress=None)),
    ]
    scenarios = make_scenarios(types, compress)

    nrecords = 10000
    bigvalue = "abcdefghij" * 1000

    # Load the compression extension, compression is enabled elsewhere.
    def conn_config(self, dir):
        return self.extensionArg(self.compress)

    # Return the wiredtiger_open extension argument for a shared library.
    def extensionArg(self, name):
        if name == None:
            return ''

        testdir = os.path.dirname(__file__)
        extdir = os.path.join(run.wt_builddir, 'ext/compressors')
        extfile = os.path.join(
            extdir, name, '.libs', 'libwiredtiger_' + name + '.so')
        if not os.path.exists(extfile):
            self.skipTest('compression extension "' + extfile + '" not built')
        return ',extensions=["' + extfile + '"]'

    # Create a table, add keys with both big and small values, then verify them.
    def test_compress(self):

        # Use relatively small leaf pages to force big values to be overflow
        # items, but still large enough that we get some compression action.
        params = 'key_format=S,value_format=S,leaf_page_max=4096'
        if self.compress != None:
            params += ',block_compressor=' + self.compress

        self.session.create(self.uri, params)
        cursor = self.session.open_cursor(self.uri, None)
        for idx in xrange(1,self.nrecords):
            cursor.set_key(`idx`)
            if idx / 12 == 0:
                cursor.set_value(`idx` + self.bigvalue)
            else:
                cursor.set_value(`idx` + "abcdefg")
            cursor.insert()
        cursor.close()

        # Force the cache to disk, so we read compressed pages from disk.
        self.reopen_conn()

        cursor = self.session.open_cursor(self.uri, None)
        for idx in xrange(1,self.nrecords):
            cursor.set_key(`idx`)
            self.assertEqual(cursor.search(), 0)
            if idx / 12 == 0:
                self.assertEquals(cursor.get_value(), `idx` + self.bigvalue)
            else:
                self.assertEquals(cursor.get_value(), `idx` + "abcdefg")
        cursor.close()

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