Problem: processes don't have an intelligible name (#2078)

Solution: when a process starts, update the "process title" as well.

bigchaindb/log/setup.py

@@ -7,7 +7,6 @@ import pickle
 from socketserver import StreamRequestHandler, ThreadingTCPServer
 import struct
 import sys
-from multiprocessing import Process
 
 from .configs import (
     DEFAULT_SOCKET_LOGGING_HOST,
@@ -15,6 +14,7 @@ from .configs import (
     PUBLISHER_LOGGING_CONFIG,
     SUBSCRIBER_LOGGING_CONFIG,
 )
+from bigchaindb.utils import Process
 from bigchaindb.common.exceptions import ConfigurationError
 
 
@@ -46,6 +46,7 @@ def setup_sub_logger(*, user_log_config=None):
     server = LogRecordSocketServer(**kwargs)
     with server:
         server_proc = Process(
+            name='logging_server',
             target=server.serve_forever,
             kwargs={'log_config': user_log_config},
         )

bigchaindb/tendermint/commands.py

@@ -1,14 +1,16 @@
 import logging
 import subprocess
-import multiprocessing as mp
 from os import getenv
 
+import setproctitle
+
 import bigchaindb
 from bigchaindb.tendermint.lib import BigchainDB
 from bigchaindb.tendermint.core import App
 from bigchaindb.web import server, websocket_server
 from bigchaindb.tendermint import event_stream
 from bigchaindb.events import Exchange, EventTypes
+from bigchaindb.utils import Process
 
 
 logger = logging.getLogger(__name__)
@@ -28,7 +30,6 @@ BANNER = """
 
 
 def start():
-
     # Exchange object for event stream api
     exchange = Exchange()
 
@@ -37,7 +38,7 @@ def start():
         settings=bigchaindb.config['server'],
         log_config=bigchaindb.config['log'],
         bigchaindb_factory=BigchainDB)
-    p_webapi = mp.Process(name='webapi', target=app_server.run)
+    p_webapi = Process(name='webapi', target=app_server.run)
     p_webapi.start()
 
     # start message
@@ -51,15 +52,15 @@ def start():
         ])
 
     # start websocket server
-    p_websocket_server = mp.Process(name='ws',
-                                    target=websocket_server.start,
-                                    args=(exchange.get_subscriber_queue(EventTypes.BLOCK_VALID),))
+    p_websocket_server = Process(name='ws',
+                                 target=websocket_server.start,
+                                 args=(exchange.get_subscriber_queue(EventTypes.BLOCK_VALID),))
     p_websocket_server.start()
 
     # connect to tendermint event stream
-    p_websocket_client = mp.Process(name='ws_to_tendermint',
-                                    target=event_stream.start,
-                                    args=(exchange.get_publisher_queue(),))
+    p_websocket_client = Process(name='ws_to_tendermint',
+                                 target=event_stream.start,
+                                 args=(exchange.get_publisher_queue(),))
     p_websocket_client.start()
 
     # We need to import this after spawning the web server
@@ -67,6 +68,8 @@ def start():
     # for gevent.
     from abci import ABCIServer
 
+    setproctitle.setproctitle('bigchaindb')
+
     app = ABCIServer(app=App())
     app.run()
 

bigchaindb/utils.py

@@ -3,6 +3,8 @@ import threading
 import queue
 import multiprocessing as mp
 
+import setproctitle
+
 
 class ProcessGroup(object):
 
@@ -26,6 +28,16 @@ class ProcessGroup(object):
             self.processes.append(proc)
 
 
+class Process(mp.Process):
+    """Wrapper around multiprocessing.Process that uses
+    setproctitle to set the name of the process when running
+    the target task."""
+
+    def run(self):
+        setproctitle.setproctitle(self.name)
+        super().run()
+
+
 # Inspired by:
 # - http://stackoverflow.com/a/24741694/597097
 def pool(builder, size, timeout=None):

setup.py

@@ -84,6 +84,7 @@ install_requires = [
     'aiohttp~=2.3',
     'python-rapidjson-schema==0.1.1',
     'abci~=0.3.0',
+    'setproctitle~=1.1.0',
 ]
 
 setup(

tests/test_utils.py

@@ -3,6 +3,8 @@ from unittest.mock import patch, call
 
 import pytest
 
+pytestmark = pytest.mark.tendermint
+
 
 @pytest.fixture
 def mock_queue(monkeypatch):
@@ -157,3 +159,18 @@ def test_lazy_execution():
     lz.name.upper()
     result = lz.run(cat)
     assert result == 'SHMUI'
+
+
+def test_process_set_title():
+    from uuid import uuid4
+    from multiprocessing import Queue
+    from setproctitle import getproctitle
+    from bigchaindb.utils import Process
+
+    queue = Queue()
+    uuid = str(uuid4())
+
+    process = Process(target=lambda: queue.put(getproctitle()),
+                      name=uuid)
+    process.start()
+    assert queue.get() == uuid