def dispatch(messageJson=None):
"""
dispatch is the microservice dispatcher for IndigoGirls, a 2048-like game. It routes
requests for game state transformations to the appropriate functions
:param
messageJson: JSON string that describes the state of the game needed for the
requested transformation
:return: A JSON string that describes the state of the game after the requested transformation
has taken place.
"""
def buildErrorString(diagnostic=None):
"""
returns a dictionary containing the specified key and accompanying diagnostic information
:param
diagnostic: A string that describes the error
:return: A dictionary that contains the specified error key having a value that
consists of the specfied error string followed by a free-form diagnostic message
"""
ERROR_PROPERTY = u'gameStatus'
ERROR_PREFIX = u'error: '
return {ERROR_PROPERTY: ERROR_PREFIX + diagnostic}
#Validate JSONness of input be converting the string to an equivalent dictionary
try:
messageDictionary = json.loads(messageJson)
except:
resultDictionary = json.dumps(
buildErrorString('input JSON string is invalid'))
return resultDictionary
#Validate presence of dispatching code
if (u"op" not in messageDictionary):
resultDictionary = json.dumps(buildErrorString('op is missing'))
return resultDictionary
#Perform the game transformation as directed by the value of the "op" key
# input to each function: a dictionary containing the name-value pairs of the input JSON string
# output of each function: a dictionary containing name-value pairs to be encoded as a JSON string
if (messageDictionary[u"op"] == u"initializeGame"):
resultDictionary = initializeGame(messageDictionary)
elif (messageDictionary[u"op"] == u"swipe"):
resultDictionary = swipe(messageDictionary)
elif (messageDictionary[u"op"] == u"recommend"):
resultDictionary = recommend(messageDictionary)
elif (messageDictionary[u"op"] == u"status"):
resultDictionary = status(messageDictionary)
elif (messageDictionary[u"op"] == u"predict"):
resultDictionary = predict(messageDictionary)
else:
resultDictionary = buildErrorString('op is invalid')
#Covert the dictionary back to a string in JSON format
resultJson = json.dumps(resultDictionary)
return resultJson
def test_swipe_ValidateRow02(self):
columnCount = 2
rowCount = 101
grid = [0] * 2
direction = "up"
board = {
"columnCount": columnCount,
"rowCount": rowCount,
"grid": grid
}
input = {"board": board, "direction": direction}
output = swipe(input)
self.assertIn("error", output["gameStatus"])
def test_swipe_Unmovable01(self):
columnCount = 2
rowCount = 2
grid = [1, 0, 4, 0]
direction = "left"
board = {
"columnCount": columnCount,
"rowCount": rowCount,
"grid": grid
}
input = {"board": board, "direction": direction}
output = swipe(input)
self.assertIn("error", output["gameStatus"])
def test_swipe_invalid_grid02(self):
columnCount = 3
rowCount = 2
grid = [1, 2, 3, 4, 5, 0, 0, 3, 4, 5, 3, 2]
direction = "up"
board = {
"columnCount": columnCount,
"rowCount": rowCount,
"grid": grid
}
input = {"board": board, "direction": direction}
output = swipe(input)
self.assertIn("error", output["gameStatus"])
def test_swipe_Normal05(self):
columnCount = 4
rowCount = 2
grid = [0, 1, 1, 1, 0, 0, 0, 0]
direction = "left"
board = {
"columnCount": columnCount,
"rowCount": rowCount,
"grid": grid
}
input = {"board": board, "direction": direction}
output = swipe(input)
grid = output["board"]["grid"]
self.assertEqual(grid[0], 2)
self.assertEqual(grid[1], 1)
self.assertEqual(output["score"], 4)
def test_swipe_Normal04(self):
columnCount = 2
rowCount = 2
grid = [1, 1, 1, 1]
direction = "down"
board = {
"columnCount": columnCount,
"rowCount": rowCount,
"grid": grid
}
input = {"board": board, "direction": direction}
output = swipe(input)
grid = output["board"]["grid"]
self.assertEquals(grid[3], 2)
self.assertEquals(grid[2], 2)
self.assertEquals(output["score"], 8)
def test_swipe_Normal02(self):
columnCount = 2
rowCount = 2
grid = [1, 0, 1, 0]
direction = "right"
board = {
"columnCount": columnCount,
"rowCount": rowCount,
"grid": grid
}
input = {"board": board, "direction": direction}
output = swipe(input)
grid = output["board"]["grid"]
self.assertEquals(grid[1], 1)
self.assertEquals(grid[3], 1)
self.assertEquals(output["score"], 0)
self.assertTrue(grid[0] != 0 or grid[2] != 0)