606 lines
25 KiB
606 lines
25 KiB
#!/usr/bin/env python3 |
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# Copyright (c) 2014-2016 The Bitcoin Core developers |
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# Distributed under the MIT software license, see the accompanying |
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# file COPYING or http://www.opensource.org/licenses/mit-license.php. |
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from test_framework.mininode import * |
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from test_framework.test_framework import BitcoinTestFramework |
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from test_framework.util import * |
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from test_framework.blocktools import create_block, create_coinbase |
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''' |
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SendHeadersTest -- test behavior of headers messages to announce blocks. |
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Setup: |
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- Two nodes, two p2p connections to node0. One p2p connection should only ever |
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receive inv's (omitted from testing description below, this is our control). |
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Second node is used for creating reorgs. |
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Part 1: No headers announcements before "sendheaders" |
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a. node mines a block [expect: inv] |
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send getdata for the block [expect: block] |
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b. node mines another block [expect: inv] |
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send getheaders and getdata [expect: headers, then block] |
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c. node mines another block [expect: inv] |
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peer mines a block, announces with header [expect: getdata] |
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d. node mines another block [expect: inv] |
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Part 2: After "sendheaders", headers announcements should generally work. |
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a. peer sends sendheaders [expect: no response] |
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peer sends getheaders with current tip [expect: no response] |
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b. node mines a block [expect: tip header] |
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c. for N in 1, ..., 10: |
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* for announce-type in {inv, header} |
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- peer mines N blocks, announces with announce-type |
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[ expect: getheaders/getdata or getdata, deliver block(s) ] |
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- node mines a block [ expect: 1 header ] |
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Part 3: Headers announcements stop after large reorg and resume after getheaders or inv from peer. |
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- For response-type in {inv, getheaders} |
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* node mines a 7 block reorg [ expect: headers announcement of 8 blocks ] |
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* node mines an 8-block reorg [ expect: inv at tip ] |
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* peer responds with getblocks/getdata [expect: inv, blocks ] |
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* node mines another block [ expect: inv at tip, peer sends getdata, expect: block ] |
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* node mines another block at tip [ expect: inv ] |
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* peer responds with getheaders with an old hashstop more than 8 blocks back [expect: headers] |
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* peer requests block [ expect: block ] |
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* node mines another block at tip [ expect: inv, peer sends getdata, expect: block ] |
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* peer sends response-type [expect headers if getheaders, getheaders/getdata if mining new block] |
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* node mines 1 block [expect: 1 header, peer responds with getdata] |
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Part 4: Test direct fetch behavior |
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a. Announce 2 old block headers. |
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Expect: no getdata requests. |
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b. Announce 3 new blocks via 1 headers message. |
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Expect: one getdata request for all 3 blocks. |
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(Send blocks.) |
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c. Announce 1 header that forks off the last two blocks. |
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Expect: no response. |
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d. Announce 1 more header that builds on that fork. |
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Expect: one getdata request for two blocks. |
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e. Announce 16 more headers that build on that fork. |
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Expect: getdata request for 14 more blocks. |
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f. Announce 1 more header that builds on that fork. |
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Expect: no response. |
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Part 5: Test handling of headers that don't connect. |
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a. Repeat 10 times: |
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1. Announce a header that doesn't connect. |
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Expect: getheaders message |
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2. Send headers chain. |
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Expect: getdata for the missing blocks, tip update. |
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b. Then send 9 more headers that don't connect. |
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Expect: getheaders message each time. |
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c. Announce a header that does connect. |
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Expect: no response. |
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d. Announce 49 headers that don't connect. |
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Expect: getheaders message each time. |
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e. Announce one more that doesn't connect. |
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Expect: disconnect. |
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''' |
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direct_fetch_response_time = 0.05 |
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class BaseNode(SingleNodeConnCB): |
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def __init__(self): |
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SingleNodeConnCB.__init__(self) |
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self.last_inv = None |
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self.last_headers = None |
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self.last_block = None |
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self.last_getdata = None |
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self.block_announced = False |
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self.last_getheaders = None |
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self.disconnected = False |
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self.last_blockhash_announced = None |
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def clear_last_announcement(self): |
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with mininode_lock: |
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self.block_announced = False |
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self.last_inv = None |
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self.last_headers = None |
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# Request data for a list of block hashes |
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def get_data(self, block_hashes): |
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msg = msg_getdata() |
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for x in block_hashes: |
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msg.inv.append(CInv(2, x)) |
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self.connection.send_message(msg) |
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def get_headers(self, locator, hashstop): |
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msg = msg_getheaders() |
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msg.locator.vHave = locator |
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msg.hashstop = hashstop |
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self.connection.send_message(msg) |
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def send_block_inv(self, blockhash): |
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msg = msg_inv() |
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msg.inv = [CInv(2, blockhash)] |
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self.connection.send_message(msg) |
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def on_inv(self, conn, message): |
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self.last_inv = message |
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self.block_announced = True |
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self.last_blockhash_announced = message.inv[-1].hash |
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def on_headers(self, conn, message): |
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self.last_headers = message |
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if len(message.headers): |
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self.block_announced = True |
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message.headers[-1].calc_sha256() |
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self.last_blockhash_announced = message.headers[-1].sha256 |
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def on_block(self, conn, message): |
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self.last_block = message.block |
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self.last_block.calc_sha256() |
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def on_getdata(self, conn, message): |
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self.last_getdata = message |
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def on_getheaders(self, conn, message): |
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self.last_getheaders = message |
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def on_close(self, conn): |
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self.disconnected = True |
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# Test whether the last announcement we received had the |
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# right header or the right inv |
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# inv and headers should be lists of block hashes |
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def check_last_announcement(self, headers=None, inv=None): |
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expect_headers = headers if headers != None else [] |
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expect_inv = inv if inv != None else [] |
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test_function = lambda: self.block_announced |
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assert(wait_until(test_function, timeout=60)) |
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with mininode_lock: |
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self.block_announced = False |
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success = True |
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compare_inv = [] |
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if self.last_inv != None: |
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compare_inv = [x.hash for x in self.last_inv.inv] |
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if compare_inv != expect_inv: |
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success = False |
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hash_headers = [] |
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if self.last_headers != None: |
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# treat headers as a list of block hashes |
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hash_headers = [ x.sha256 for x in self.last_headers.headers ] |
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if hash_headers != expect_headers: |
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success = False |
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self.last_inv = None |
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self.last_headers = None |
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return success |
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# Syncing helpers |
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def wait_for_block(self, blockhash, timeout=60): |
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test_function = lambda: self.last_block != None and self.last_block.sha256 == blockhash |
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assert(wait_until(test_function, timeout=timeout)) |
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return |
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def wait_for_getheaders(self, timeout=60): |
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test_function = lambda: self.last_getheaders != None |
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assert(wait_until(test_function, timeout=timeout)) |
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return |
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def wait_for_getdata(self, hash_list, timeout=60): |
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if hash_list == []: |
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return |
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test_function = lambda: self.last_getdata != None and [x.hash for x in self.last_getdata.inv] == hash_list |
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assert(wait_until(test_function, timeout=timeout)) |
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return |
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def wait_for_disconnect(self, timeout=60): |
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test_function = lambda: self.disconnected |
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assert(wait_until(test_function, timeout=timeout)) |
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return |
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def wait_for_block_announcement(self, block_hash, timeout=60): |
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test_function = lambda: self.last_blockhash_announced == block_hash |
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assert(wait_until(test_function, timeout=timeout)) |
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return |
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def send_header_for_blocks(self, new_blocks): |
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headers_message = msg_headers() |
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headers_message.headers = [ CBlockHeader(b) for b in new_blocks ] |
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self.send_message(headers_message) |
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def send_getblocks(self, locator): |
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getblocks_message = msg_getblocks() |
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getblocks_message.locator.vHave = locator |
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self.send_message(getblocks_message) |
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# InvNode: This peer should only ever receive inv's, because it doesn't ever send a |
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# "sendheaders" message. |
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class InvNode(BaseNode): |
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def __init__(self): |
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BaseNode.__init__(self) |
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# TestNode: This peer is the one we use for most of the testing. |
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class TestNode(BaseNode): |
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def __init__(self): |
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BaseNode.__init__(self) |
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class SendHeadersTest(BitcoinTestFramework): |
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def __init__(self): |
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super().__init__() |
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self.setup_clean_chain = True |
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self.num_nodes = 2 |
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def setup_network(self): |
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self.nodes = [] |
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self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, [["-debug", "-logtimemicros=1"]]*2) |
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connect_nodes(self.nodes[0], 1) |
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# mine count blocks and return the new tip |
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def mine_blocks(self, count): |
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# Clear out last block announcement from each p2p listener |
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[ x.clear_last_announcement() for x in self.p2p_connections ] |
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self.nodes[0].generate(count) |
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return int(self.nodes[0].getbestblockhash(), 16) |
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# mine a reorg that invalidates length blocks (replacing them with |
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# length+1 blocks). |
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# Note: we clear the state of our p2p connections after the |
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# to-be-reorged-out blocks are mined, so that we don't break later tests. |
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# return the list of block hashes newly mined |
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def mine_reorg(self, length): |
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self.nodes[0].generate(length) # make sure all invalidated blocks are node0's |
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sync_blocks(self.nodes, wait=0.1) |
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for x in self.p2p_connections: |
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x.wait_for_block_announcement(int(self.nodes[0].getbestblockhash(), 16)) |
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x.clear_last_announcement() |
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tip_height = self.nodes[1].getblockcount() |
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hash_to_invalidate = self.nodes[1].getblockhash(tip_height-(length-1)) |
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self.nodes[1].invalidateblock(hash_to_invalidate) |
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all_hashes = self.nodes[1].generate(length+1) # Must be longer than the orig chain |
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sync_blocks(self.nodes, wait=0.1) |
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return [int(x, 16) for x in all_hashes] |
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def run_test(self): |
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# Setup the p2p connections and start up the network thread. |
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inv_node = InvNode() |
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test_node = TestNode() |
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self.p2p_connections = [inv_node, test_node] |
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connections = [] |
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connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], inv_node)) |
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# Set nServices to 0 for test_node, so no block download will occur outside of |
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# direct fetching |
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connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_node, services=0)) |
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inv_node.add_connection(connections[0]) |
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test_node.add_connection(connections[1]) |
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NetworkThread().start() # Start up network handling in another thread |
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# Test logic begins here |
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inv_node.wait_for_verack() |
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test_node.wait_for_verack() |
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tip = int(self.nodes[0].getbestblockhash(), 16) |
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# PART 1 |
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# 1. Mine a block; expect inv announcements each time |
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print("Part 1: headers don't start before sendheaders message...") |
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for i in range(4): |
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old_tip = tip |
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tip = self.mine_blocks(1) |
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True) |
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assert_equal(test_node.check_last_announcement(inv=[tip]), True) |
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# Try a few different responses; none should affect next announcement |
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if i == 0: |
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# first request the block |
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test_node.get_data([tip]) |
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test_node.wait_for_block(tip, timeout=5) |
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elif i == 1: |
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# next try requesting header and block |
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test_node.get_headers(locator=[old_tip], hashstop=tip) |
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test_node.get_data([tip]) |
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test_node.wait_for_block(tip) |
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test_node.clear_last_announcement() # since we requested headers... |
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elif i == 2: |
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# this time announce own block via headers |
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height = self.nodes[0].getblockcount() |
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last_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time'] |
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block_time = last_time + 1 |
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new_block = create_block(tip, create_coinbase(height+1), block_time) |
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new_block.solve() |
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test_node.send_header_for_blocks([new_block]) |
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test_node.wait_for_getdata([new_block.sha256], timeout=5) |
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test_node.send_message(msg_block(new_block)) |
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test_node.sync_with_ping() # make sure this block is processed |
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inv_node.clear_last_announcement() |
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test_node.clear_last_announcement() |
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print("Part 1: success!") |
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print("Part 2: announce blocks with headers after sendheaders message...") |
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# PART 2 |
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# 2. Send a sendheaders message and test that headers announcements |
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# commence and keep working. |
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test_node.send_message(msg_sendheaders()) |
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prev_tip = int(self.nodes[0].getbestblockhash(), 16) |
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test_node.get_headers(locator=[prev_tip], hashstop=0) |
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test_node.sync_with_ping() |
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# Now that we've synced headers, headers announcements should work |
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tip = self.mine_blocks(1) |
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True) |
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assert_equal(test_node.check_last_announcement(headers=[tip]), True) |
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height = self.nodes[0].getblockcount()+1 |
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block_time += 10 # Advance far enough ahead |
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for i in range(10): |
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# Mine i blocks, and alternate announcing either via |
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# inv (of tip) or via headers. After each, new blocks |
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# mined by the node should successfully be announced |
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# with block header, even though the blocks are never requested |
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for j in range(2): |
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blocks = [] |
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for b in range(i+1): |
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blocks.append(create_block(tip, create_coinbase(height), block_time)) |
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blocks[-1].solve() |
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tip = blocks[-1].sha256 |
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block_time += 1 |
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height += 1 |
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if j == 0: |
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# Announce via inv |
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test_node.send_block_inv(tip) |
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test_node.wait_for_getheaders(timeout=5) |
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# Should have received a getheaders now |
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test_node.send_header_for_blocks(blocks) |
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# Test that duplicate inv's won't result in duplicate |
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# getdata requests, or duplicate headers announcements |
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[ inv_node.send_block_inv(x.sha256) for x in blocks ] |
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test_node.wait_for_getdata([x.sha256 for x in blocks], timeout=5) |
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inv_node.sync_with_ping() |
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else: |
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# Announce via headers |
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test_node.send_header_for_blocks(blocks) |
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test_node.wait_for_getdata([x.sha256 for x in blocks], timeout=5) |
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# Test that duplicate headers won't result in duplicate |
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# getdata requests (the check is further down) |
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inv_node.send_header_for_blocks(blocks) |
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inv_node.sync_with_ping() |
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[ test_node.send_message(msg_block(x)) for x in blocks ] |
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test_node.sync_with_ping() |
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inv_node.sync_with_ping() |
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# This block should not be announced to the inv node (since it also |
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# broadcast it) |
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assert_equal(inv_node.last_inv, None) |
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assert_equal(inv_node.last_headers, None) |
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tip = self.mine_blocks(1) |
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True) |
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assert_equal(test_node.check_last_announcement(headers=[tip]), True) |
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height += 1 |
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block_time += 1 |
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print("Part 2: success!") |
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print("Part 3: headers announcements can stop after large reorg, and resume after headers/inv from peer...") |
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# PART 3. Headers announcements can stop after large reorg, and resume after |
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# getheaders or inv from peer. |
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for j in range(2): |
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# First try mining a reorg that can propagate with header announcement |
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new_block_hashes = self.mine_reorg(length=7) |
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tip = new_block_hashes[-1] |
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True) |
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assert_equal(test_node.check_last_announcement(headers=new_block_hashes), True) |
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block_time += 8 |
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# Mine a too-large reorg, which should be announced with a single inv |
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new_block_hashes = self.mine_reorg(length=8) |
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tip = new_block_hashes[-1] |
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True) |
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assert_equal(test_node.check_last_announcement(inv=[tip]), True) |
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block_time += 9 |
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fork_point = self.nodes[0].getblock("%02x" % new_block_hashes[0])["previousblockhash"] |
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fork_point = int(fork_point, 16) |
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# Use getblocks/getdata |
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test_node.send_getblocks(locator = [fork_point]) |
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assert_equal(test_node.check_last_announcement(inv=new_block_hashes), True) |
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test_node.get_data(new_block_hashes) |
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test_node.wait_for_block(new_block_hashes[-1]) |
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for i in range(3): |
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# Mine another block, still should get only an inv |
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tip = self.mine_blocks(1) |
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True) |
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assert_equal(test_node.check_last_announcement(inv=[tip]), True) |
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if i == 0: |
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# Just get the data -- shouldn't cause headers announcements to resume |
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test_node.get_data([tip]) |
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test_node.wait_for_block(tip) |
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elif i == 1: |
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# Send a getheaders message that shouldn't trigger headers announcements |
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# to resume (best header sent will be too old) |
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test_node.get_headers(locator=[fork_point], hashstop=new_block_hashes[1]) |
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test_node.get_data([tip]) |
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test_node.wait_for_block(tip) |
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elif i == 2: |
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test_node.get_data([tip]) |
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test_node.wait_for_block(tip) |
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# This time, try sending either a getheaders to trigger resumption |
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# of headers announcements, or mine a new block and inv it, also |
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# triggering resumption of headers announcements. |
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if j == 0: |
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test_node.get_headers(locator=[tip], hashstop=0) |
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test_node.sync_with_ping() |
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else: |
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test_node.send_block_inv(tip) |
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test_node.sync_with_ping() |
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# New blocks should now be announced with header |
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tip = self.mine_blocks(1) |
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True) |
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assert_equal(test_node.check_last_announcement(headers=[tip]), True) |
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print("Part 3: success!") |
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print("Part 4: Testing direct fetch behavior...") |
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tip = self.mine_blocks(1) |
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height = self.nodes[0].getblockcount() + 1 |
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last_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time'] |
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block_time = last_time + 1 |
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# Create 2 blocks. Send the blocks, then send the headers. |
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blocks = [] |
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for b in range(2): |
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blocks.append(create_block(tip, create_coinbase(height), block_time)) |
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blocks[-1].solve() |
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tip = blocks[-1].sha256 |
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block_time += 1 |
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height += 1 |
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inv_node.send_message(msg_block(blocks[-1])) |
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inv_node.sync_with_ping() # Make sure blocks are processed |
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test_node.last_getdata = None |
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test_node.send_header_for_blocks(blocks) |
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test_node.sync_with_ping() |
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# should not have received any getdata messages |
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with mininode_lock: |
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assert_equal(test_node.last_getdata, None) |
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# This time, direct fetch should work |
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blocks = [] |
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for b in range(3): |
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blocks.append(create_block(tip, create_coinbase(height), block_time)) |
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blocks[-1].solve() |
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tip = blocks[-1].sha256 |
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block_time += 1 |
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height += 1 |
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test_node.send_header_for_blocks(blocks) |
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test_node.sync_with_ping() |
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test_node.wait_for_getdata([x.sha256 for x in blocks], timeout=direct_fetch_response_time) |
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[ test_node.send_message(msg_block(x)) for x in blocks ] |
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test_node.sync_with_ping() |
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# Now announce a header that forks the last two blocks |
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tip = blocks[0].sha256 |
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height -= 1 |
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blocks = [] |
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# Create extra blocks for later |
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for b in range(20): |
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blocks.append(create_block(tip, create_coinbase(height), block_time)) |
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blocks[-1].solve() |
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tip = blocks[-1].sha256 |
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block_time += 1 |
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height += 1 |
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# Announcing one block on fork should not trigger direct fetch |
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# (less work than tip) |
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test_node.last_getdata = None |
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test_node.send_header_for_blocks(blocks[0:1]) |
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test_node.sync_with_ping() |
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with mininode_lock: |
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assert_equal(test_node.last_getdata, None) |
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# Announcing one more block on fork should trigger direct fetch for |
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# both blocks (same work as tip) |
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test_node.send_header_for_blocks(blocks[1:2]) |
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test_node.sync_with_ping() |
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test_node.wait_for_getdata([x.sha256 for x in blocks[0:2]], timeout=direct_fetch_response_time) |
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|
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# Announcing 16 more headers should trigger direct fetch for 14 more |
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# blocks |
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test_node.send_header_for_blocks(blocks[2:18]) |
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test_node.sync_with_ping() |
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test_node.wait_for_getdata([x.sha256 for x in blocks[2:16]], timeout=direct_fetch_response_time) |
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|
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# Announcing 1 more header should not trigger any response |
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test_node.last_getdata = None |
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test_node.send_header_for_blocks(blocks[18:19]) |
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test_node.sync_with_ping() |
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with mininode_lock: |
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assert_equal(test_node.last_getdata, None) |
|
|
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print("Part 4: success!") |
|
|
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# Now deliver all those blocks we announced. |
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[ test_node.send_message(msg_block(x)) for x in blocks ] |
|
|
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print("Part 5: Testing handling of unconnecting headers") |
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# First we test that receipt of an unconnecting header doesn't prevent |
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# chain sync. |
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for i in range(10): |
|
test_node.last_getdata = None |
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blocks = [] |
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# Create two more blocks. |
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for j in range(2): |
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blocks.append(create_block(tip, create_coinbase(height), block_time)) |
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blocks[-1].solve() |
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tip = blocks[-1].sha256 |
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block_time += 1 |
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height += 1 |
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# Send the header of the second block -> this won't connect. |
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with mininode_lock: |
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test_node.last_getheaders = None |
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test_node.send_header_for_blocks([blocks[1]]) |
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test_node.wait_for_getheaders(timeout=1) |
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test_node.send_header_for_blocks(blocks) |
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test_node.wait_for_getdata([x.sha256 for x in blocks]) |
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[ test_node.send_message(msg_block(x)) for x in blocks ] |
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test_node.sync_with_ping() |
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assert_equal(int(self.nodes[0].getbestblockhash(), 16), blocks[1].sha256) |
|
|
|
blocks = [] |
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# Now we test that if we repeatedly don't send connecting headers, we |
|
# don't go into an infinite loop trying to get them to connect. |
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MAX_UNCONNECTING_HEADERS = 10 |
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for j in range(MAX_UNCONNECTING_HEADERS+1): |
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blocks.append(create_block(tip, create_coinbase(height), block_time)) |
|
blocks[-1].solve() |
|
tip = blocks[-1].sha256 |
|
block_time += 1 |
|
height += 1 |
|
|
|
for i in range(1, MAX_UNCONNECTING_HEADERS): |
|
# Send a header that doesn't connect, check that we get a getheaders. |
|
with mininode_lock: |
|
test_node.last_getheaders = None |
|
test_node.send_header_for_blocks([blocks[i]]) |
|
test_node.wait_for_getheaders(timeout=1) |
|
|
|
# Next header will connect, should re-set our count: |
|
test_node.send_header_for_blocks([blocks[0]]) |
|
|
|
# Remove the first two entries (blocks[1] would connect): |
|
blocks = blocks[2:] |
|
|
|
# Now try to see how many unconnecting headers we can send |
|
# before we get disconnected. Should be 5*MAX_UNCONNECTING_HEADERS |
|
for i in range(5*MAX_UNCONNECTING_HEADERS - 1): |
|
# Send a header that doesn't connect, check that we get a getheaders. |
|
with mininode_lock: |
|
test_node.last_getheaders = None |
|
test_node.send_header_for_blocks([blocks[i%len(blocks)]]) |
|
test_node.wait_for_getheaders(timeout=1) |
|
|
|
# Eventually this stops working. |
|
with mininode_lock: |
|
self.last_getheaders = None |
|
test_node.send_header_for_blocks([blocks[-1]]) |
|
|
|
# Should get disconnected |
|
test_node.wait_for_disconnect() |
|
with mininode_lock: |
|
self.last_getheaders = True |
|
|
|
print("Part 5: success!") |
|
|
|
# Finally, check that the inv node never received a getdata request, |
|
# throughout the test |
|
assert_equal(inv_node.last_getdata, None) |
|
|
|
if __name__ == '__main__': |
|
SendHeadersTest().main()
|
|
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