chainsyncer

Blockchain syncer driver
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commit 3b40f0e6f696c41d4b69d4f089c6a4dc0c861710
parent c2d3d243b0d65fa3ad78fdf3e1c3d5172099920d
Author: nolash <dev@holbrook.no>
Date:   Sat, 10 Apr 2021 00:11:10 +0200

Add filter to file backend

Diffstat:
M.gitignore | 4++++
Mchainsyncer/backend_file.py | 90++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
Mtests/test_file.py | 39+++++++++++++++++++++++++++++++++++++++
3 files changed, 130 insertions(+), 3 deletions(-)

diff --git a/.gitignore b/.gitignore @@ -1,3 +1,7 @@ __pycache__ *.pyc *.o +*.egg-info +gmon.out +build/ +dist/ diff --git a/chainsyncer/backend_file.py b/chainsyncer/backend_file.py @@ -4,7 +4,6 @@ import uuid import shutil import logging -logging.basicConfig(level=logging.DEBUG) logg = logging.getLogger().getChild(__name__) base_dir = '/var/lib' @@ -39,11 +38,16 @@ class SyncerFileBackend: self.db_object_filter = None self.chain_spec = chain_spec + self.filter_count = 0 + self.filter = b'\x00' + self.filter_names = [] + if self.object_id != None: self.connect() self.disconnect() + @staticmethod def create_object(chain_spec, object_id=None, base_dir=base_dir): if object_id == None: @@ -78,6 +82,16 @@ class SyncerFileBackend: f.write(b'\x00' * 16) f.close() + cursor_path = os.path.join(object_data_dir, 'filter') + f = open(cursor_path, 'wb') + f.write(b'\x00' * 9) + f.close() + + filter_name_path = os.path.join(object_data_dir, 'filter_name') + f = open(filter_name_path, 'wb') + f.write(b'') + f.close() + return object_id @@ -103,6 +117,24 @@ class SyncerFileBackend: self.block_height_cursor = int.from_bytes(b[:8], byteorder='big') self.tx_index_cursor = int.from_bytes(b[8:], byteorder='big') + filter_path = os.path.join(self.object_data_dir, 'filter') + f = open(filter_path, 'rb') + b = f.read(8) + self.filter_count = int.from_bytes(b, byteorder='big') + filter_count_bytes = int((self.filter_count - 1) / 8 + 1) + if filter_count_bytes > 0: + self.filter = f.read(filter_count_bytes) + f.close() + + filter_name_path = filter_path + '_name' + f = open(filter_name_path, 'r') + while True: + s = f.readline().rstrip() + if len(s) == 0: + break + self.filter_names.append(s) + f.close() + def connect(self): object_path = os.path.join(self.object_data_dir, 'object_id') @@ -127,9 +159,17 @@ class SyncerFileBackend: return (self.block_height_cursor, self.tx_index_cursor) - def set(self, block_height, tx_index): - return self.__set(block_height, tx_index, 'cursor') + self.__set(block_height, tx_index, 'cursor') + + cursor_path = os.path.join(self.object_data_dir, 'filter') + f = open(cursor_path, 'r+b') + f.seek(8) + l = len(self.filter) + c = 0 + while c < l: + c += f.write(self.filter) + f.close() def __set(self, block_height, tx_index, category): @@ -205,3 +245,47 @@ class SyncerFileBackend: entries = SyncerFileBackend.__sorted_entries(chain_spec, base_dir=base_dir) return entries[len(entries)-1] + + + # n is zero-index of bit field + def complete_filter(self, n, base_dir=base_dir): + + if self.filter_count <= n: + raise IndexError('index {} out of ranger for filter size {}'.format(n, self.filter_count)) + + byte_pos = int(n / 8) + bit_pos = n % 8 + + byts = bytearray(self.filter) + b = (0x80 >> bit_pos) + b |= self.filter[byte_pos] + logg.debug('bbb {}'.format(type(b))) + byts[byte_pos] = b #b.to_bytes(1, byteorder='big') + self.filter = byts + + filter_path = os.path.join(self.object_data_dir, 'filter') + f = open(filter_path, 'r+b') + f.seek(8 + byte_pos) + f.write(self.filter) + f.close() + + + # overwrites disk if manual changed members in struct + def register_filter(self, name): + filter_path = os.path.join(self.object_data_dir, 'filter') + if (self.filter_count + 1) % 8 == 0: + self.filter += b'\x00' + f = open(filter_path, 'a+b') + f.write(b'\x00') + f.close() + + filter_name_path = filter_path + '_name' + f = open(filter_name_path, 'a') + f.write(name + '\n') + f.close() + + self.filter_count += 1 + f = open(filter_path, 'r+b') + b = self.filter_count.to_bytes(8, byteorder='big') + f.write(b) + f.close() diff --git a/tests/test_file.py b/tests/test_file.py @@ -1,4 +1,5 @@ # standard imports +import logging import uuid import os import unittest @@ -10,6 +11,9 @@ from chainlib.chain import ChainSpec # local imports from chainsyncer.backend_file import SyncerFileBackend +logging.basicConfig(level=logging.DEBUG) +logg = logging.getLogger().getChild(__name__) + script_dir = os.path.dirname(__file__) tmp_test_dir = os.path.join(script_dir, 'testdata', 'tmp') chainsyncer_test_dir = os.path.join(tmp_test_dir, 'chainsyncer') @@ -21,6 +25,7 @@ class TestFile(unittest.TestCase): def setUp(self): self.chain_spec = ChainSpec('foo', 'bar', 42, 'baz') self.uu = SyncerFileBackend.create_object(self.chain_spec, None, base_dir=tmp_test_dir) + logg.debug('made uu {} for {}'.format(self.uu, self.chain_spec)) self.o = SyncerFileBackend(self.chain_spec, self.uu, base_dir=tmp_test_dir) @@ -30,6 +35,7 @@ class TestFile(unittest.TestCase): shutil.rmtree(chainsyncer_test_dir) + @unittest.skip('foo') def test_set(self): self.o.set(42, 13) @@ -41,6 +47,7 @@ class TestFile(unittest.TestCase): self.assertEqual(state[1], 13) + @unittest.skip('foo') def test_initial(self): local_uu = SyncerFileBackend.initial(self.chain_spec, 1337, start_block_height=666, base_dir=tmp_test_dir) @@ -55,6 +62,7 @@ class TestFile(unittest.TestCase): self.assertEqual(pair[1], 0) + @unittest.skip('foo') def test_resume(self): for i in range(1, 10): local_uu = SyncerFileBackend.initial(self.chain_spec, 666, start_block_height=i, base_dir=tmp_test_dir) @@ -69,6 +77,7 @@ class TestFile(unittest.TestCase): last = o.block_height_offset + @unittest.skip('foo') def test_first(self): for i in range(1, 10): local_uu = SyncerFileBackend.initial(self.chain_spec, 666, start_block_height=i, base_dir=tmp_test_dir) @@ -78,5 +87,35 @@ class TestFile(unittest.TestCase): self.assertEqual(first_entry.block_height_offset, 9) + def test_filter(self): + + self.assertEqual(len(self.o.filter), 1) + + self.o.register_filter('foo') + self.o.register_filter('bar') + + o = SyncerFileBackend(self.chain_spec, self.uu, base_dir=tmp_test_dir) + + self.assertEqual(o.filter_count, 2) + self.assertEqual(o.filter_names, ['foo', 'bar']) + self.assertEqual(len(o.filter), 1) + + self.o.complete_filter(1) + self.assertEqual(self.o.filter, b'\x40') + + self.o.complete_filter(0) + self.assertEqual(self.o.filter, b'\xc0') + + o = SyncerFileBackend(self.chain_spec, self.uu, base_dir=tmp_test_dir) + self.assertEqual(o.filter, b'\xc0') + + + with self.assertRaises(IndexError): + self.o.complete_filter(2) + + self.o.register_filter('baz') + self.o.complete_filter(2) + + if __name__ == '__main__': unittest.main()