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Firestore: Add Watch Support (#6191)
Firestore watch
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# Copyright 2017 Google LLC All rights reserved. | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
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from enum import Enum | ||
from google.cloud.firestore_v1beta1._helpers import decode_value | ||
import math | ||
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class TypeOrder(Enum): | ||
# NOTE: This order is defined by the backend and cannot be changed. | ||
NULL = 0 | ||
BOOLEAN = 1 | ||
NUMBER = 2 | ||
TIMESTAMP = 3 | ||
STRING = 4 | ||
BLOB = 5 | ||
REF = 6 | ||
GEO_POINT = 7 | ||
ARRAY = 8 | ||
OBJECT = 9 | ||
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@staticmethod | ||
def from_value(value): | ||
v = value.WhichOneof('value_type') | ||
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lut = { | ||
'null_value': TypeOrder.NULL, | ||
'boolean_value': TypeOrder.BOOLEAN, | ||
'integer_value': TypeOrder.NUMBER, | ||
'double_value': TypeOrder.NUMBER, | ||
'timestamp_value': TypeOrder.TIMESTAMP, | ||
'string_value': TypeOrder.STRING, | ||
'bytes_value': TypeOrder.BLOB, | ||
'reference_value': TypeOrder.REF, | ||
'geo_point_value': TypeOrder.GEO_POINT, | ||
'array_value': TypeOrder.ARRAY, | ||
'map_value': TypeOrder.OBJECT, | ||
} | ||
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if v not in lut: | ||
raise ValueError( | ||
"Could not detect value type for " + v) | ||
return lut[v] | ||
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class Order(object): | ||
''' | ||
Order implements the ordering semantics of the backend. | ||
''' | ||
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@classmethod | ||
def compare(cls, left, right): | ||
''' | ||
Main comparison function for all Firestore types. | ||
@return -1 is left < right, 0 if left == right, otherwise 1 | ||
''' | ||
# First compare the types. | ||
leftType = TypeOrder.from_value(left).value | ||
rightType = TypeOrder.from_value(right).value | ||
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if leftType != rightType: | ||
if leftType < rightType: | ||
return -1 | ||
return 1 | ||
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value_type = left.WhichOneof('value_type') | ||
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if value_type == 'null_value': | ||
return 0 # nulls are all equal | ||
elif value_type == 'boolean_value': | ||
return cls._compare_to(left.boolean_value, right.boolean_value) | ||
elif value_type == 'integer_value': | ||
return cls.compare_numbers(left, right) | ||
elif value_type == 'double_value': | ||
return cls.compare_numbers(left, right) | ||
elif value_type == 'timestamp_value': | ||
return cls.compare_timestamps(left, right) | ||
elif value_type == 'string_value': | ||
return cls._compare_to(left.string_value, right.string_value) | ||
elif value_type == 'bytes_value': | ||
return cls.compare_blobs(left, right) | ||
elif value_type == 'reference_value': | ||
return cls.compare_resource_paths(left, right) | ||
elif value_type == 'geo_point_value': | ||
return cls.compare_geo_points(left, right) | ||
elif value_type == 'array_value': | ||
return cls.compare_arrays(left, right) | ||
elif value_type == 'map_value': | ||
return cls.compare_objects(left, right) | ||
else: | ||
raise ValueError('Unknown ``value_type``', str(value_type)) | ||
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@staticmethod | ||
def compare_blobs(left, right): | ||
left_bytes = left.bytes_value | ||
right_bytes = right.bytes_value | ||
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return Order._compare_to(left_bytes, right_bytes) | ||
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@staticmethod | ||
def compare_timestamps(left, right): | ||
left = left.timestamp_value | ||
right = right.timestamp_value | ||
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seconds = Order._compare_to(left.seconds or 0, right.seconds or 0) | ||
if seconds != 0: | ||
return seconds | ||
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return Order._compare_to(left.nanos or 0, right.nanos or 0) | ||
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@staticmethod | ||
def compare_geo_points(left, right): | ||
left_value = decode_value(left, None) | ||
right_value = decode_value(right, None) | ||
cmp = ( | ||
(left_value.latitude > right_value.latitude) - | ||
(left_value.latitude < right_value.latitude) | ||
) | ||
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if cmp != 0: | ||
return cmp | ||
return ( | ||
(left_value.longitude > right_value.longitude) - | ||
(left_value.longitude < right_value.longitude) | ||
) | ||
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@staticmethod | ||
def compare_resource_paths(left, right): | ||
left = left.reference_value | ||
right = right.reference_value | ||
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left_segments = left.split('/') | ||
right_segments = right.split('/') | ||
shorter = min(len(left_segments), len(right_segments)) | ||
# compare segments | ||
for i in range(shorter): | ||
if (left_segments[i] < right_segments[i]): | ||
return -1 | ||
if (left_segments[i] > right_segments[i]): | ||
return 1 | ||
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left_length = len(left) | ||
right_length = len(right) | ||
return (left_length > right_length) - (left_length < right_length) | ||
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@staticmethod | ||
def compare_arrays(left, right): | ||
l_values = left.array_value.values | ||
r_values = right.array_value.values | ||
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length = min(len(l_values), len(r_values)) | ||
for i in range(length): | ||
cmp = Order.compare(l_values[i], r_values[i]) | ||
if cmp != 0: | ||
return cmp | ||
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return Order._compare_to(len(l_values), len(r_values)) | ||
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@staticmethod | ||
def compare_objects(left, right): | ||
left_fields = left.map_value.fields | ||
right_fields = right.map_value.fields | ||
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for left_key, right_key in zip( | ||
sorted(left_fields), sorted(right_fields) | ||
): | ||
keyCompare = Order._compare_to(left_key, right_key) | ||
if keyCompare != 0: | ||
return keyCompare | ||
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value_compare = Order.compare( | ||
left_fields[left_key], right_fields[right_key]) | ||
if value_compare != 0: | ||
return value_compare | ||
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return Order._compare_to(len(left_fields), len(right_fields)) | ||
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@staticmethod | ||
def compare_numbers(left, right): | ||
left_value = decode_value(left, None) | ||
right_value = decode_value(right, None) | ||
return Order.compare_doubles(left_value, right_value) | ||
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@staticmethod | ||
def compare_doubles(left, right): | ||
if math.isnan(left): | ||
if math.isnan(right): | ||
return 0 | ||
return -1 | ||
if math.isnan(right): | ||
return 1 | ||
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return Order._compare_to(left, right) | ||
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@staticmethod | ||
def _compare_to(left, right): | ||
# We can't just use cmp(left, right) because cmp doesn't exist | ||
# in Python 3, so this is an equivalent suggested by | ||
# https://docs.python.org/3.0/whatsnew/3.0.html#ordering-comparisons | ||
return (left > right) - (left < right) |
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