98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
"""Onionr - Private P2P Communication.
|
|
|
|
Stream blocks we can for inbound edge peers that ask for them
|
|
|
|
doesn't apply for blocks in the gossip queue that are awaiting
|
|
descision to fluff or stem
|
|
|
|
"""
|
|
from asyncio import IncompleteReadError, wait_for
|
|
|
|
import queue
|
|
import traceback
|
|
from typing import TYPE_CHECKING
|
|
from time import time
|
|
|
|
if TYPE_CHECKING:
|
|
from asyncio import StreamWriter, StreamReader
|
|
from onionrblocks import Block
|
|
|
|
from ..constants import BLOCK_MAX_SIZE, BLOCK_MAX_SIZE_LEN
|
|
|
|
import logger
|
|
from blockdb import get_blocks_after_timestamp, block_storage_observers
|
|
"""
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
"""
|
|
|
|
|
|
async def stream_blocks(reader: 'StreamReader', writer: 'StreamWriter'):
|
|
"""stream blocks to a peer created since an offset
|
|
"""
|
|
time_offset = await wait_for(reader.read(8), 12)
|
|
time_offset = time_offset.decode('utf-8')
|
|
keep_writing = True
|
|
|
|
# Makes sure timestamp is positive and not weird
|
|
if not all(c in "0123456789" for c in time_offset):
|
|
raise ValueError("Invalid time offset")
|
|
time_offset = int(time_offset)
|
|
|
|
if time_offset - time() < -5:
|
|
raise ValueError(
|
|
"Peer's specified time offset skewed too far into the future")
|
|
|
|
newly_stored_blocks = queue.Queue()
|
|
def _add_to_queue(bl):
|
|
newly_stored_blocks.put_nowait(bl)
|
|
block_storage_observers.append(
|
|
_add_to_queue
|
|
)
|
|
|
|
async def _send_block(bl: 'Block'):
|
|
writer.write(block.id)
|
|
await writer.drain()
|
|
writer.write(
|
|
str(len(block.raw)).zfill(BLOCK_MAX_SIZE_LEN).encode('utf-8'))
|
|
await writer.drain()
|
|
writer.write(block.raw)
|
|
await writer.drain()
|
|
|
|
try:
|
|
for block in get_blocks_after_timestamp(time_offset):
|
|
if not keep_writing:
|
|
break
|
|
|
|
await _send_block(block)
|
|
|
|
try:
|
|
keep_writing = bool(
|
|
int.from_bytes(await reader.readexactly(1), 'big')
|
|
)
|
|
except IncompleteReadError:
|
|
keep_writing = False
|
|
|
|
while keep_writing:
|
|
await _send_block(newly_stored_blocks.get())
|
|
try:
|
|
keep_writing = bool(
|
|
int.from_bytes(await reader.readexactly(1), 'big')
|
|
)
|
|
except IncompleteReadError:
|
|
keep_writing = False
|
|
except Exception:
|
|
logger.warn(traceback.format_exc(), terminal=True)
|
|
|
|
block_storage_observers.remove(_add_to_queue)
|