uWSGI thread dump trigger

gistfile1.py

# added in WSGI handler run by uUWSGI

import sys
import os.path

try:
    import uwsgi
    import threading

    stack_dump_file = '/tmp/stack-dump-trigger' ## given as an example; put this somewhere better than /tmp

    if not os.path.exists(stack_dump_file):
        open(stack_dump_file, 'w')

    def thread_dump(dummy_signum):
        print >>sys.stderr, "### BEGIN THREAD DUMP"
        thread_names = dict([(t.ident, t.name) for t in threading.enumerate()])
        for threadId, stack in sys._current_frames().items():
            print >>sys.stderr, "\n# ThreadID: %s (%s)" % (threadId, thread_names.get(threadId, 'NO_NAME_AVAILABLE'))
            for filename, lineno, name, line in traceback.extract_stack(stack):
                print >>sys.stderr, 'File: "%s", line %d, in %s' % (filename, lineno, name)
                if line:
                    print >>sys.stderr, "  %s" % (line.strip())
        print >>sys.stderr, "### END THREAD DUMP"

    uwsgi.register_signal(17, 'workers', thread_dump)
    uwsgi.add_file_monitor(17, stack_dump_file)

    print >>sys.stderr, "Listening for stack dump requests via %r" % (stack_dump_file,)
except ImportError:
    print >>sys.stderr, "Not running under uwsgi; unable to configure stack dump trigger"
except IOError:
    print >>sys.stderr, "IOError creating stack dump trigger %r" % (stack_dump_file,)