parsing and inserting works

lbry/blockchain/block.py

@@ -15,8 +15,7 @@ class Block:
         'bits', 'nonce', 'txs'
     )
 
-    def __init__(self, stream):
-        stream.read_uint32()  # block size
+    def __init__(self, stream: BCDataStream):
         header = stream.data.read(112)
         version, = struct.unpack('<I', header[:4])
         timestamp, bits, nonce = struct.unpack('<III', header[100:112])
@@ -37,11 +36,3 @@ class Block:
     @property
     def is_first_block(self):
         return self.prev_block_hash == ZERO_BLOCK
-
-
-def read_blocks(block_file):
-    with open(block_file, 'rb') as fp:
-        stream = BCDataStream(fp=fp)
-        #while stream.read_uint32() == 4054508794:
-        while stream.read_uint32() == 3517637882:
-            yield Block(stream)

lbry/blockchain/db.py

@@ -1,36 +1,39 @@
 import os
 import asyncio
-from collections import namedtuple
+from concurrent import futures
+from collections import namedtuple, deque
 
+import sqlite3
 import apsw
 
 
 DDL = """
 pragma journal_mode=WAL;
 
-create table block (
-    block_hash bytes not null,
+create table if not exists block (
+    block_hash bytes not null primary key,
     previous_hash bytes not null,
+    file_number integer not null,
     height int
 );
-create table tx (
+create table if not exists tx (
     block_hash integer not null,
     position integer not null,
     tx_hash bytes not null
 );
-create table txi (
+create table if not exists txi (
     block_hash bytes not null,
     tx_hash bytes not null,
     txo_hash bytes not null
 );
-create table claim (
+create table if not exists claim (
     txo_hash bytes not null,
     claim_hash bytes not null,
     claim_name text not null,
     amount integer not null,
     height integer
 );
-create table claim_history (
+create table if not exists claim_history (
     block_hash bytes not null,
     tx_hash bytes not null,
     tx_position integer not null,
@@ -42,7 +45,7 @@ create table claim_history (
     height integer,
     is_spent bool
 );
-create table support (
+create table if not exists support (
     block_hash bytes not null,
     tx_hash bytes not null,
     txo_hash bytes not null,
@@ -60,22 +63,35 @@ class BlockchainDB:
         self.db = None
         self.directory = path
 
+    @property
+    def db_file_path(self):
+        return os.path.join(self.directory, 'blockchain.db')
+
     def open(self):
-        self.db = apsw.Connection(
-            os.path.join(self.directory, 'blockchain.db'),
-            flags=(
-                apsw.SQLITE_OPEN_READWRITE |
-                apsw.SQLITE_OPEN_CREATE |
-                apsw.SQLITE_OPEN_URI
-            )
-        )
-        def exec_factory(cursor, statement, bindings):
-            tpl = namedtuple('row', (d[0] for d in cursor.getdescription()))
-            cursor.setrowtrace(lambda cursor, row: tpl(*row))
-            return True
-        self.db.setexectrace(exec_factory)
-        self.execute(DDL)
-        self.execute(f"ATTACH {os.path.join(self._db_path, 'block_index.sqlite')} AS block_index")
+        self.db = sqlite3.connect(self.db_file_path, isolation_level=None, uri=True, timeout=60.0 * 5)
+        self.db.executescript("""
+        pragma journal_mode=wal;
+        """)
+#        self.db = apsw.Connection(
+#            self.db_file_path,
+#            flags=(
+#                apsw.SQLITE_OPEN_READWRITE |
+#                apsw.SQLITE_OPEN_CREATE |
+#                apsw.SQLITE_OPEN_URI
+#            )
+#        )
+        self.execute_ddl(DDL)
+        self.execute(f"ATTACH ? AS block_index", ('file:'+os.path.join(self.directory, 'block_index.sqlite')+'?mode=ro',))
+        #def exec_factory(cursor, statement, bindings):
+        #    tpl = namedtuple('row', (d[0] for d in cursor.getdescription()))
+        #    cursor.setrowtrace(lambda cursor, row: tpl(*row))
+        #    return True
+        #self.db.setexectrace(exec_factory)
+        def row_factory(cursor, row):
+            tpl = namedtuple('row', (d[0] for d in cursor.description))
+            return tpl(*row)
+        self.db.row_factory = row_factory
+        return self
 
     def close(self):
         if self.db is not None:
@@ -84,41 +100,73 @@ class BlockchainDB:
     def execute(self, *args):
         return self.db.cursor().execute(*args)
 
-    def executemany(self, *args):
+    def execute_many(self, *args):
         return self.db.cursor().executemany(*args)
 
+    def execute_many_tx(self, *args):
+        cursor = self.db.cursor()
+        cursor.execute('begin;')
+        result = cursor.executemany(*args)
+        cursor.execute('commit;')
+        return result
+
+    def execute_ddl(self, *args):
+        self.db.executescript(*args)
+        #deque(self.execute(*args), maxlen=0)
+
     def begin(self):
         self.execute('begin;')
 
     def commit(self):
         self.execute('commit;')
 
-    def get_blocks(self):
-        pass
+    def get_block_file_path_from_number(self, block_file_number):
+        return os.path.join(self.directory, 'blocks', f'blk{block_file_number:05}.dat')
+
+    def get_block_files_not_synced(self):
+        return list(self.execute(
+            """
+            SELECT file as file_number, COUNT(hash) as blocks, SUM(txcount) as txs
+            FROM block_index.block_info
+            WHERE hash NOT IN (SELECT block_hash FROM block)
+            GROUP BY file ORDER BY file ASC;
+            """
+        ))
+
+    def get_blocks_not_synced(self, block_file):
+        return self.execute(
+            """
+            SELECT datapos as data_offset, height, hash as block_hash, txCount as txs
+            FROM block_index.block_info
+            WHERE file = ? AND hash NOT IN (SELECT block_hash FROM block)
+            ORDER BY datapos ASC;
+            """, (block_file,)
+        )
 
 
 class AsyncBlockchainDB:
 
-    __slots__ = 'db',
-
     def __init__(self, db: BlockchainDB):
-        self.db = db
+        self.sync_db = db
+        self.executor = futures.ThreadPoolExecutor(max_workers=1)
 
     @classmethod
-    def from_path(cls, path: str):
+    def from_path(cls, path: str) -> 'AsyncBlockchainDB':
         return cls(BlockchainDB(path))
 
-    @staticmethod
-    async def run_in_executor(func, *args):
+    def get_block_file_path_from_number(self, block_file_number):
+        return self.sync_db.get_block_file_path_from_number(block_file_number)
+
+    async def run_in_executor(self, func, *args):
         return await asyncio.get_running_loop().run_in_executor(
-            None, func, *args
+            self.executor, func, *args
         )
 
     async def open(self):
-        return await self.run_in_executor(self.db.open)
+        return await self.run_in_executor(self.sync_db.open)
 
     async def close(self):
-        return await self.run_in_executor(self.db.close)
+        return await self.run_in_executor(self.sync_db.close)
 
-    async def get_blocks(self):
-        return await self.run_in_executor(self.db.get_blocks)
+    async def get_block_files_not_synced(self):
+        return await self.run_in_executor(self.sync_db.get_block_files_not_synced)

lbry/blockchain/lbrycrd.py

@@ -56,8 +56,12 @@ class Process(asyncio.SubprocessProtocol):
 
 class Lbrycrd:
 
-    def __init__(self, path=None):
-        self.data_path = path
+    def __init__(self, path, regtest=False):
+        self.data_dir = self.actual_data_dir = path
+        self.regtest = regtest
+        if regtest:
+            self.actual_data_dir = os.path.join(self.data_dir, 'regtest')
+        self.blocks_dir = os.path.join(self.actual_data_dir, 'blocks')
         self.bin_dir = os.path.join(os.path.dirname(__file__), 'bin')
         self.daemon_bin = os.path.join(self.bin_dir, 'lbrycrdd')
         self.cli_bin = os.path.join(self.bin_dir, 'lbrycrd-cli')
@@ -71,13 +75,15 @@ class Lbrycrd:
         self.session: Optional[aiohttp.ClientSession] = None
         self.subscribed = False
         self.subscription: Optional[asyncio.Task] = None
+        self.subscription_url = 'tcp://127.0.0.1:29000'
+        self.default_generate_address = None
         self._on_block_controller = StreamController()
         self.on_block = self._on_block_controller.stream
         self.on_block.listen(lambda e: log.info('%s %s', hexlify(e['hash']), e['msg']))
 
     @classmethod
-    def regtest(cls):
-        return cls(tempfile.mkdtemp())
+    def temp_regtest(cls):
+        return cls(tempfile.mkdtemp(), True)
 
     @property
     def rpc_url(self):
@@ -125,18 +131,26 @@ class Lbrycrd:
     async def ensure(self):
         return self.exists or await self.download()
 
+    def get_start_command(self, *args):
+        if self.regtest:
+            args += '-regtest',
+        return (
+            self.daemon_bin,
+            f'-datadir={self.data_dir}',
+            f'-port={self.peerport}',
+            f'-rpcport={self.rpcport}',
+            f'-rpcuser={self.rpcuser}',
+            f'-rpcpassword={self.rpcpassword}',
+            f'-zmqpubhashblock={self.subscription_url}',
+            '-server', '-printtoconsole',
+            *args
+        )
+
     async def start(self, *args):
         loop = asyncio.get_event_loop()
-        command = [
-            self.daemon_bin,
-            f'-datadir={self.data_path}', '-printtoconsole', '-regtest', '-server',
-            f'-rpcuser={self.rpcuser}', f'-rpcpassword={self.rpcpassword}', f'-rpcport={self.rpcport}',
-            f'-port={self.peerport}', '-zmqpubhashblock=tcp://127.0.0.1:29000', *args
-        ]
+        command = self.get_start_command(*args)
         log.info(' '.join(command))
-        self.transport, self.protocol = await loop.subprocess_exec(
-            Process, *command
-        )
+        self.transport, self.protocol = await loop.subprocess_exec(Process, *command)
         await self.protocol.ready.wait()
         assert not self.protocol.stopped.is_set()
         self.session = aiohttp.ClientSession()
@@ -146,14 +160,14 @@ class Lbrycrd:
             await self.session.close()
             self.transport.terminate()
             await self.protocol.stopped.wait()
-            self.transport.close()
+            assert self.transport.get_returncode() == 0, "lbrycrd daemon exit with error"
         finally:
             if cleanup:
                 await self.cleanup()
 
     async def cleanup(self):
         await asyncio.get_running_loop().run_in_executor(
-            None, shutil.rmtree, self.data_path, True
+            None, shutil.rmtree, self.data_dir, True
         )
 
     def subscribe(self):
@@ -161,7 +175,7 @@ class Lbrycrd:
             self.subscribed = True
             ctx = zmq.asyncio.Context.instance()
             sock = ctx.socket(zmq.SUB)
-            sock.connect("tcp://127.0.0.1:29000")
+            sock.connect(self.subscription_url)
             sock.subscribe("hashblock")
             self.subscription = asyncio.create_task(self.subscription_handler(sock))
 
@@ -202,7 +216,24 @@ class Lbrycrd:
                 raise Exception(result['error'])
 
     async def generate(self, blocks):
-        return await self.rpc("generate", [blocks])
+        if self.default_generate_address is None:
+            self.default_generate_address = await self.get_new_address()
+        return await self.generate_to_address(blocks, self.default_generate_address)
+
+    async def get_new_address(self):
+        return await self.rpc("getnewaddress")
+
+    async def generate_to_address(self, blocks, address):
+        return await self.rpc("generatetoaddress", [blocks, address])
+
+    async def fund_raw_transaction(self, tx):
+        return await self.rpc("fundrawtransaction", [tx])
+
+    async def sign_raw_transaction_with_wallet(self, tx):
+        return await self.rpc("signrawtransactionwithwallet", [tx])
+
+    async def send_raw_transaction(self, tx):
+        return await self.rpc("sendrawtransaction", [tx])
 
     async def claim_name(self, name, data, amount):
         return await self.rpc("claimname", [name, data, amount])

lbry/blockchain/sync.py

@@ -1,22 +1,100 @@
 import os
-import time
+import asyncio
 import logging
-from glob import glob
-from concurrent.futures import ProcessPoolExecutor
+import tqdm
+from threading import Thread
+from multiprocessing import Queue, Event
+from concurrent import futures
+from typing import Dict, Tuple
+
+from lbry.wallet.stream import StreamController
 
 from .lbrycrd import Lbrycrd
-from .block import read_blocks
 from .db import AsyncBlockchainDB
+from . import worker
 
 
 log = logging.getLogger(__name__)
 
 
+class ProgressMonitorThread(Thread):
+
+    STOP = 'stop'
+    FORMAT = '{l_bar}{bar}| {n_fmt:>6}/{total_fmt:>7} [{elapsed}<{remaining:>5}, {rate_fmt:>15}]'
+
+    def __init__(self, state: dict, queue: Queue, stream_controller: StreamController):
+        super().__init__()
+        self.state = state
+        self.queue = queue
+        self.stream_controller = stream_controller
+        self.loop = asyncio.get_event_loop()
+
+    def run(self):
+        asyncio.set_event_loop(self.loop)
+        block_bar = tqdm.tqdm(
+            desc='total parsing', total=sum(s['total_blocks'] for s in self.state.values()),
+            unit='blocks', bar_format=self.FORMAT
+        )
+        tx_bar = tqdm.tqdm(
+            desc='total loading', total=sum(s['total_txs'] for s in self.state.values()),
+            unit='txs', bar_format=self.FORMAT
+        )
+        bars: Dict[int, tqdm.tqdm] = {}
+        while True:
+            msg = self.queue.get()
+            if msg == self.STOP:
+                return
+            file_num, msg_type, done = msg
+            bar, state = bars.get(file_num, None), self.state[file_num]
+            if msg_type == 1:
+                if bar is None:
+                    bar = bars[file_num] = tqdm.tqdm(
+                        desc=f'├─ blk{file_num:05}.dat parsing', total=state['total_blocks'],
+                        unit='blocks', bar_format=self.FORMAT
+                    )
+                change = done - state['done_blocks']
+                state['done_blocks'] = done
+                bar.update(change)
+                block_bar.update(change)
+                if state['total_blocks'] == done:
+                    bar.set_description('✔  '+bar.desc[3:])
+                    bar.close()
+                    bars.pop(file_num)
+            elif msg_type == 2:
+                if bar is None:
+                    bar = bars[file_num] = tqdm.tqdm(
+                        desc=f'├─ blk{file_num:05}.dat loading', total=state['total_txs'],
+                        unit='txs', bar_format=self.FORMAT
+                    )
+                change = done - state['done_txs']
+                state['done_txs'] = done
+                bar.update(change)
+                tx_bar.update(change)
+                if state['total_txs'] == done:
+                    bar.set_description('✔  '+bar.desc[3:])
+                    bar.close()
+                    bars.pop(file_num)
+            self.stream_controller.add(msg)
+
+    def shutdown(self):
+        self.queue.put(self.STOP)
+        self.join()
+
+    def __enter__(self):
+        self.start()
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.shutdown()
+
+
 class BlockSync:
 
-    def __init__(self, chain: Lbrycrd):
+    def __init__(self, chain: Lbrycrd, use_process_pool=False):
         self.chain = chain
-        self.db = AsyncBlockchainDB.from_path(os.path.join(self.chain.data_path, 'regtest'))
+        self.use_process_pool = use_process_pool
+        self.db = AsyncBlockchainDB.from_path(self.chain.actual_data_dir)
+        self._on_progress_controller = StreamController()
+        self.on_progress = self._on_progress_controller.stream
 
     async def start(self):
         await self.db.open()
@@ -24,86 +102,59 @@ class BlockSync:
     async def stop(self):
         await self.db.close()
 
-    async def cleanup(self):
-        pass
+    def get_worker_pool(self, queue, full_stop) -> futures.Executor:
+        args = dict(
+            initializer=worker.initializer,
+            initargs=(self.chain.actual_data_dir, queue, full_stop)
+        )
+        if not self.use_process_pool:
+            return futures.ThreadPoolExecutor(max_workers=1, **args)
+        return futures.ProcessPoolExecutor(max_workers=max(os.cpu_count()-1, 4), **args)
 
+    def get_progress_monitor(self, state, queue) -> ProgressMonitorThread:
+        return ProgressMonitorThread(state, queue, self._on_progress_controller)
 
-def process_file(block_file):
-    blocks, txs, claims, supports, spends = [], [], [], [], []
-    for block in read_blocks(block_file):
-        for tx in block.txs:
-            txs.append((block.block_hash, tx.position, tx.hash))
-            for txi in tx.inputs:
-                if not txi.is_coinbase:
-                    spends.append((block.block_hash, tx.hash, txi.txo_ref.hash))
-            for output in tx.outputs:
-                try:
-                    if output.is_support:
-                        supports.append((
-                            block.block_hash, tx.hash, output.ref.hash, output.claim_hash, output.amount
-                        ))
-                    elif output.script.is_claim_name:
-                        claims.append((
-                            block.block_hash, tx.hash, tx.position, output.ref.hash, output.claim_hash,
-                            output.claim_name, 1, output.amount, None, None
-                        ))
-                    elif output.script.is_update_claim:
-                        claims.append((
-                            block.block_hash, tx.hash, tx.position, output.ref.hash, output.claim_hash,
-                            output.claim_name, 2, output.amount, None, None
-                        ))
-                except:
-                    pass
-        blocks.append((block.block_hash, block.prev_block_hash, 0 if block.is_first_block else None))
+    async def load_blocks(self):
+        jobs = []
+        queue, full_stop = Queue(), Event()
+        executor = self.get_worker_pool(queue, full_stop)
+        files = list(await self.db.get_block_files_not_synced())
+        state = {
+            file.file_number: {
+                'status': worker.PENDING,
+                'done_txs': 0,
+                'total_txs': file.txs,
+                'done_blocks': 0,
+                'total_blocks': file.blocks,
+            } for file in files
+        }
+        progress = self.get_progress_monitor(state, queue)
+        progress.start()
 
-    sql = db.get()
+        def cancel_all_the_things():
+            for job in jobs:
+                job.cancel()
+            full_stop.set()
+            for job in jobs:
+                exception = job.exception()
+                if exception is not None:
+                    raise exception
 
-    sql.execute('begin;')
-    sql.executemany("insert into block values (?, ?, ?)", blocks)
-    sql.execute('commit;')
+        try:
 
-    sql.execute('begin;')
-    sql.executemany("insert into tx values (?, ?, ?)", txs)
-    sql.execute('commit;')
+            for file in files:
+                jobs.append(executor.submit(worker.process_block_file, file.file_number))
 
-    sql.execute('begin;')
-    sql.executemany("insert into txi values (?, ?, ?)", spends)
-    sql.execute('commit;')
+            done, not_done = await asyncio.get_event_loop().run_in_executor(
+                None, futures.wait, jobs, None, futures.FIRST_EXCEPTION
+            )
+            if not_done:
+                cancel_all_the_things()
 
-    sql.execute('begin;')
-    sql.executemany("insert into support values (?, ?, ?, ?, ?)", supports)
-    sql.execute('commit;')
+        except asyncio.CancelledError:
+            cancel_all_the_things()
+            raise
 
-    sql.execute('begin;')
-    sql.executemany("insert into claim_history values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)", claims)
-    sql.execute('commit;')
-
-    return len(blocks), len(txs)
-
-
-async def main():
-
-    #lbrycrd = os.path.expanduser('~/.lbrycrd/')
-
-    output_db = '/tmp/fast_sync.db'
-    if os.path.exists(output_db):
-        os.remove(output_db)
-    initializer(output_db)
-    create_db()
-    executor = ProcessPoolExecutor(
-        6, initializer=initializer, initargs=(output_db,)
-    )
-    file_paths = glob(os.path.join(lbrycrd, 'regtest', 'blocks', 'blk*.dat'))
-    file_paths.sort()
-    total_blocks, total_txs = 0, 0
-    start = time.perf_counter()
-    for file_path, (blocks, txs) in zip(file_paths, executor.map(process_file, file_paths)):
-        print(f"{file_path} {blocks}")
-        total_blocks += blocks
-        total_txs += txs
-    print(f'blocks: {total_blocks} (txs: {total_txs}) in {time.perf_counter()-start}s')
-    print('cleaning chain: set block heights and delete forks')
-    #clean_chain()
-    print(f'done in {time.perf_counter()-start}s')
-
-    await blockchain.stop()
+        finally:
+            progress.shutdown()
+            executor.shutdown()

lbry/blockchain/worker.py

@@ -0,0 +1,101 @@
+from typing import Optional
+from contextvars import ContextVar
+from multiprocessing import Queue, Event
+from dataclasses import dataclass
+from itertools import islice
+
+from lbry.wallet.bcd_data_stream import BCDataStream
+from .db import BlockchainDB
+from .block import Block
+
+
+PENDING = 'pending'
+RUNNING = 'running'
+STOPPED = 'stopped'
+
+
+def chunk(rows, step):
+    it, total = iter(rows), len(rows)
+    for _ in range(0, total, step):
+        yield min(step, total), islice(it, step)
+        total -= step
+
+
+@dataclass
+class WorkerContext:
+    db: BlockchainDB
+    progress: Queue
+    stop: Event
+
+
+context: ContextVar[Optional[WorkerContext]] = ContextVar('context')
+
+
+def initializer(data_dir: str, progress: Queue, stop: Event):
+    context.set(WorkerContext(
+        db=BlockchainDB(data_dir).open(),
+        progress=progress,
+        stop=stop
+    ))
+
+
+def process_block_file(block_file_number):
+    ctx: WorkerContext = context.get()
+    db, progress, stop = ctx.db, ctx.progress, ctx.stop
+    block_file_path = db.get_block_file_path_from_number(block_file_number)
+    num = 0
+    progress.put_nowait((block_file_number, 1, num))
+    with open(block_file_path, 'rb') as fp:
+        stream = BCDataStream(fp=fp)
+        blocks, txs, claims, supports, spends = [], [], [], [], []
+        for num, block_info in enumerate(db.get_blocks_not_synced(block_file_number), start=1):
+            if ctx.stop.is_set():
+                return
+            if num % 100 == 0:
+                progress.put_nowait((block_file_number, 1, num))
+            fp.seek(block_info.data_offset)
+            block = Block(stream)
+            for tx in block.txs:
+                txs.append((block.block_hash, tx.position, tx.hash))
+                for txi in tx.inputs:
+                    if not txi.is_coinbase:
+                        spends.append((block.block_hash, tx.hash, txi.txo_ref.hash))
+                for output in tx.outputs:
+                    try:
+                        if output.is_support:
+                            supports.append((
+                                block.block_hash, tx.hash, output.ref.hash, output.claim_hash, output.amount
+                            ))
+                        elif output.script.is_claim_name:
+                            claims.append((
+                                block.block_hash, tx.hash, tx.position, output.ref.hash, output.claim_hash,
+                                output.claim_name, 1, output.amount, None, None
+                            ))
+                        elif output.script.is_update_claim:
+                            claims.append((
+                                block.block_hash, tx.hash, tx.position, output.ref.hash, output.claim_hash,
+                                output.claim_name, 2, output.amount, None, None
+                            ))
+                    except:
+                        pass
+            blocks.append((block.block_hash, block.prev_block_hash, block_file_number, 0 if block.is_first_block else None))
+
+    progress.put((block_file_number, 1, num))
+
+    queries = (
+        ("insert into block values (?, ?, ?, ?)", blocks),
+        ("insert into tx values (?, ?, ?)", txs),
+        ("insert into txi values (?, ?, ?)", spends),
+        ("insert into support values (?, ?, ?, ?, ?)", supports),
+        ("insert into claim_history values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)", claims),
+    )
+    total_txs = len(txs)
+    done_txs = 0
+    step = int(sum(len(q[1]) for q in queries)/total_txs)
+    progress.put((block_file_number, 2, done_txs))
+    for sql, rows in queries:
+        for chunk_size, chunk_rows in chunk(rows, 10000):
+            db.execute_many_tx(sql, chunk_rows)
+            done_txs += int(chunk_size/step)
+            progress.put((block_file_number, 2, done_txs))
+    progress.put((block_file_number, 2, total_txs))

lbry/scripts/fast_sync.py

@@ -6,8 +6,8 @@ import asyncio
 import struct
 from contextvars import ContextVar
 from concurrent.futures import ProcessPoolExecutor
-from torba.client.bcd_data_stream import BCDataStream
-from torba.client.hash import double_sha256
+from lbry.wallet.bcd_data_stream import BCDataStream
+from lbry.crypto.hash import double_sha256
 from lbry.wallet.transaction import Transaction
 from binascii import hexlify
 
@@ -49,10 +49,11 @@ def parse_header(header):
 
 def parse_txs(stream):
     tx_count = stream.read_compact_size()
-    return [Transaction.from_stream(i, stream) for i in range(tx_count)]
+    return [Transaction(position=i)._deserialize(stream) for i in range(tx_count)]
 
 
 def process_file(file_path):
+    print(f'started: {file_path}')
     sql = db.get()
     stream = BCDataStream()
     stream.data = open(file_path, 'rb')
@@ -86,6 +87,8 @@ def process_file(file_path):
                     pass
         blocks.append((header['block_hash'], header['prev_block_hash'], 0 if is_first_block else None))
 
+    print(f'inserting sql in {file_path}')
+
     sql.execute('begin;')
     sql.executemany("insert into block values (?, ?, ?)", blocks)
     sql.execute('commit;')
@@ -265,7 +268,7 @@ async def main():
         total_txs += txs
     print(f'blocks: {total_blocks} (txs: {total_txs}) in {time.perf_counter()-start}s')
     print('cleaning chain: set block heights and delete forks')
-    clean_chain()
+    #clean_chain()
     print(f'done in {time.perf_counter()-start}s')
     executor.shutdown(True)
 

scripts/fast_sync.py

@@ -0,0 +1,19 @@
+import os.path
+import asyncio
+from lbry.blockchain import Lbrycrd
+from lbry.blockchain.sync import BlockSync
+
+
+async def main():
+    chain = Lbrycrd(os.path.expanduser('~/.lbrycrd'), False)
+    sync = BlockSync(chain, use_process_pool=True)
+    if os.path.exists(sync.db.sync_db.db_file_path):
+        os.remove(sync.db.sync_db.db_file_path)
+    await sync.db.open()
+    await sync.load_blocks()
+    #await chain.stop(False)
+
+try:
+    asyncio.run(main())
+except KeyboardInterrupt:
+    print('exiting')