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from __future__ import with_statement
import pytest
from redis import exceptions
from redis._compat import b
multiply_script = """
local value = redis.call('GET', KEYS[1])
value = tonumber(value)
return value * ARGV[1]"""
class TestScripting(object):
@pytest.fixture(autouse=True)
def reset_scripts(self, r):
r.script_flush()
def test_eval(self, r):
r.set('a', 2)
# 2 * 3 == 6
assert r.eval(multiply_script, 1, 'a', 3) == 6
def test_evalsha(self, r):
r.set('a', 2)
sha = r.script_load(multiply_script)
# 2 * 3 == 6
assert r.evalsha(sha, 1, 'a', 3) == 6
def test_evalsha_script_not_loaded(self, r):
r.set('a', 2)
sha = r.script_load(multiply_script)
# remove the script from Redis's cache
r.script_flush()
with pytest.raises(exceptions.NoScriptError):
r.evalsha(sha, 1, 'a', 3)
def test_script_loading(self, r):
# get the sha, then clear the cache
sha = r.script_load(multiply_script)
r.script_flush()
assert r.script_exists(sha) == [False]
r.script_load(multiply_script)
assert r.script_exists(sha) == [True]
def test_script_object(self, r):
r.set('a', 2)
multiply = r.register_script(multiply_script)
assert not multiply.sha
# test evalsha fail -> script load + retry
assert multiply(keys=['a'], args=[3]) == 6
assert multiply.sha
assert r.script_exists(multiply.sha) == [True]
# test first evalsha
assert multiply(keys=['a'], args=[3]) == 6
def test_script_object_in_pipeline(self, r):
multiply = r.register_script(multiply_script)
assert not multiply.sha
pipe = r.pipeline()
pipe.set('a', 2)
pipe.get('a')
multiply(keys=['a'], args=[3], client=pipe)
# even though the pipeline wasn't executed yet, we made sure the
# script was loaded and got a valid sha
assert multiply.sha
assert r.script_exists(multiply.sha) == [True]
# [SET worked, GET 'a', result of multiple script]
assert pipe.execute() == [True, b('2'), 6]
# purge the script from redis's cache and re-run the pipeline
# the multiply script object knows it's sha, so it shouldn't get
# reloaded until pipe.execute()
r.script_flush()
pipe = r.pipeline()
pipe.set('a', 2)
pipe.get('a')
assert multiply.sha
multiply(keys=['a'], args=[3], client=pipe)
assert r.script_exists(multiply.sha) == [False]
# [SET worked, GET 'a', result of multiple script]
assert pipe.execute() == [True, b('2'), 6]
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