diff --git a/swh/graph/backend.py b/swh/graph/backend.py index b99ba0d..0b2ba6c 100644 --- a/swh/graph/backend.py +++ b/swh/graph/backend.py @@ -1,200 +1,199 @@ # Copyright (C) 2019 The Software Heritage developers # See the AUTHORS file at the top-level directory of this distribution # License: GNU General Public License version 3, or any later version # See top-level LICENSE file for more information import asyncio import contextlib import io import os import pathlib import struct import subprocess import sys import tempfile from py4j.java_gateway import JavaGateway from swh.graph.pid import IntToPidMap, PidToIntMap from swh.model.identifiers import PID_TYPES BUF_SIZE = 64*1024 BIN_FMT = '>q' # 64 bit integer, big endian PATH_SEPARATOR_ID = -1 NODE2PID_EXT = 'node2pid.bin' PID2NODE_EXT = 'pid2node.bin' def find_graph_jar(): swh_graph_root = pathlib.Path(__file__).parents[2] try_paths = [ swh_graph_root / 'java/server/target/', pathlib.Path(sys.prefix) / 'share/swh-graph/', ] for path in try_paths: glob = list(path.glob('swh-graph-*.jar')) if glob: return str(glob[0]) raise RuntimeError("swh-graph-*.jar not found. Have you run `make java`?") def _get_pipe_stderr(): # Get stderr if possible, or pipe to stdout if running with Jupyter. try: sys.stderr.fileno() except io.UnsupportedOperation: return subprocess.STDOUT else: return sys.stderr class Backend: def __init__(self, graph_path): self.gateway = None self.entry = None self.graph_path = graph_path def __enter__(self): # TODO: make all of that configurable with sane defaults java_opts = [ - '-Xmx640G', - '-Xss1G', + '-Xmx200G', '-server', '-XX:PretenureSizeThreshold=512M', '-XX:MaxNewSize=4G', '-XX:+UseLargePages', '-XX:+UseTransparentHugePages', '-XX:+UseNUMA', '-XX:+UseTLAB', '-XX:+ResizeTLAB', ] self.gateway = JavaGateway.launch_gateway( java_path=None, javaopts=java_opts, classpath=find_graph_jar(), die_on_exit=True, redirect_stdout=sys.stdout, redirect_stderr=_get_pipe_stderr(), ) self.entry = self.gateway.jvm.org.softwareheritage.graph.Entry() self.entry.load_graph(self.graph_path) self.node2pid = IntToPidMap(self.graph_path + '.' + NODE2PID_EXT) self.pid2node = PidToIntMap(self.graph_path + '.' + PID2NODE_EXT) self.stream_proxy = JavaStreamProxy(self.entry) return self def __exit__(self, exc_type, exc_value, tb): self.gateway.shutdown() def stats(self): return self.entry.stats() def count(self, ttype, direction, edges_fmt, src): method = getattr(self.entry, 'count_' + ttype) return method(direction, edges_fmt, src) async def simple_traversal(self, ttype, direction, edges_fmt, src): assert ttype in ('leaves', 'neighbors', 'visit_nodes') method = getattr(self.stream_proxy, ttype) async for node_id in method(direction, edges_fmt, src): yield node_id async def walk(self, direction, edges_fmt, algo, src, dst): if dst in PID_TYPES: it = self.stream_proxy.walk_type(direction, edges_fmt, algo, src, dst) else: it = self.stream_proxy.walk(direction, edges_fmt, algo, src, dst) async for node_id in it: yield node_id async def visit_paths(self, direction, edges_fmt, src): path = [] async for node in self.stream_proxy.visit_paths( direction, edges_fmt, src): if node == PATH_SEPARATOR_ID: yield path path = [] else: path.append(node) class JavaStreamProxy: """A proxy class for the org.softwareheritage.graph.Entry Java class that takes care of the setup and teardown of the named-pipe FIFO communication between Python and Java. Initialize JavaStreamProxy using: proxy = JavaStreamProxy(swh_entry_class_instance) Then you can call an Entry method and iterate on the FIFO results like this: async for value in proxy.java_method(arg1, arg2): print(value) """ def __init__(self, entry): self.entry = entry async def read_node_ids(self, fname): loop = asyncio.get_event_loop() open_thread = loop.run_in_executor(None, open, fname, 'rb') # Since the open() call on the FIFO is blocking until it is also opened # on the Java side, we await it with a timeout in case there is an # exception that prevents the write-side open(). with (await asyncio.wait_for(open_thread, timeout=2)) as f: while True: data = await loop.run_in_executor(None, f.read, BUF_SIZE) if not data: break for data in struct.iter_unpack(BIN_FMT, data): yield data[0] class _HandlerWrapper: def __init__(self, handler): self._handler = handler def __getattr__(self, name): func = getattr(self._handler, name) async def java_call(*args, **kwargs): loop = asyncio.get_event_loop() await loop.run_in_executor(None, lambda: func(*args, **kwargs)) def java_task(*args, **kwargs): return asyncio.create_task(java_call(*args, **kwargs)) return java_task @contextlib.contextmanager def get_handler(self): with tempfile.TemporaryDirectory(prefix='swh-graph-') as tmpdirname: cli_fifo = os.path.join(tmpdirname, 'swh-graph.fifo') os.mkfifo(cli_fifo) reader = self.read_node_ids(cli_fifo) query_handler = self.entry.get_handler(cli_fifo) handler = self._HandlerWrapper(query_handler) yield (handler, reader) def __getattr__(self, name): async def java_call_iterator(*args, **kwargs): with self.get_handler() as (handler, reader): java_task = getattr(handler, name)(*args, **kwargs) try: async for value in reader: yield value except asyncio.TimeoutError: # If the read-side open() timeouts, an exception on the # Java side probably happened that prevented the # write-side open(). We propagate this exception here if # that is the case. task_exc = java_task.exception() if task_exc: raise task_exc raise await java_task return java_call_iterator