artiq/artiq/tools.py

from operator import itemgetter
import importlib.machinery
import linecache
import logging
import sys
import asyncio
import time
import collections
import os
import atexit

import numpy as np

from artiq.language.environment import is_experiment
from artiq.protocols import pyon


__all__ = ["artiq_dir", "parse_arguments", "elide", "short_format", "file_import",
           "get_experiment", "verbosity_args", "simple_network_args", "init_logger",
           "atexit_register_coroutine", "exc_to_warning", "asyncio_wait_or_cancel",
           "TaskObject", "Condition", "workaround_asyncio263"]


logger = logging.getLogger(__name__)

artiq_dir = os.path.join(os.path.abspath(os.path.dirname(__file__)))


def parse_arguments(arguments):
    d = {}
    for argument in arguments:
        name, eq, value = argument.partition("=")
        d[name] = pyon.decode(value)
    return d


def elide(s, maxlen):
    elided = False
    if len(s) > maxlen:
        s = s[:maxlen]
        elided = True
    try:
        idx = s.index("\n")
    except ValueError:
        pass
    else:
        s = s[:idx]
        elided = True
    if elided:
        maxlen -= 3
        if len(s) > maxlen:
            s = s[:maxlen]
        s += "..."
    return s


def short_format(v):
    if v is None:
        return "None"
    t = type(v)
    if t is bool or np.issubdtype(t, int) or np.issubdtype(t, float):
        return str(v)
    elif t is str:
        return "\"" + elide(v, 50) + "\""
    else:
        r = t.__name__
        if t is list or t is dict or t is set:
            r += " ({})".format(len(v))
        if t is np.ndarray:
            r += " " + str(np.shape(v))
        return r


def file_import(filename, prefix="file_import_"):
    linecache.checkcache(filename)

    modname = filename
    i = modname.rfind("/")
    if i > 0:
        modname = modname[i+1:]
    i = modname.find(".")
    if i > 0:
        modname = modname[:i]
    modname = prefix + modname

    path = os.path.dirname(os.path.realpath(filename))
    sys.path.insert(0, path)

    loader = importlib.machinery.SourceFileLoader(modname, filename)
    module = loader.load_module()

    sys.path.remove(path)

    return module


def get_experiment(module, experiment=None):
    if experiment:
        return getattr(module, experiment)

    exps = [(k, v) for k, v in module.__dict__.items()
            if k[0] != "_" and is_experiment(v)]
    if not exps:
        raise ValueError("No experiments in module")
    if len(exps) > 1:
        raise ValueError("More than one experiment found in module")
    return exps[0][1]


def verbosity_args(parser):
    group = parser.add_argument_group("verbosity")
    group.add_argument("-v", "--verbose", default=0, action="count",
                       help="increase logging level")
    group.add_argument("-q", "--quiet", default=0, action="count",
                       help="decrease logging level")


def simple_network_args(parser, default_port):
    group = parser.add_argument_group("network")
    group.add_argument("--bind", default="::1",
                       help="hostname or IP address to bind to")
    group.add_argument("-p", "--port", default=default_port, type=int,
                       help="TCP port to listen to (default: %(default)d)")


def init_logger(args):
    logging.basicConfig(level=logging.WARNING + args.quiet*10 - args.verbose*10)


def atexit_register_coroutine(coroutine, loop=None):
    if loop is None:
        loop = asyncio.get_event_loop()
    atexit.register(lambda: loop.run_until_complete(coroutine()))


async def exc_to_warning(coro):
    try:
        await coro
    except:
        logger.warning("asyncio coroutine terminated with exception",
                       exc_info=True)


async def asyncio_wait_or_cancel(fs, **kwargs):
    fs = [asyncio.ensure_future(f) for f in fs]
    try:
        d, p = await asyncio.wait(fs, **kwargs)
    except:
        for f in fs:
            f.cancel()
        raise
    for f in p:
        f.cancel()
        await asyncio.wait([f])
    return fs


class TaskObject:
    def start(self):
        self.task = asyncio.ensure_future(self._do())

    async def stop(self):
        self.task.cancel()
        try:
            await asyncio.wait_for(self.task, None)
        except asyncio.CancelledError:
            pass
        del self.task

    async def _do(self):
        raise NotImplementedError


class Condition:
    def __init__(self, *, loop=None):
        if loop is not None:
            self._loop = loop
        else:
            self._loop = asyncio.get_event_loop()
        self._waiters = collections.deque()

    async def wait(self):
        """Wait until notified."""
        fut = asyncio.Future(loop=self._loop)
        self._waiters.append(fut)
        try:
            await fut
        finally:
            self._waiters.remove(fut)

    def notify(self):
        for fut in self._waiters:
            if not fut.done():
                fut.set_result(False)


# See: https://github.com/python/asyncio/issues/263
@asyncio.coroutine
def workaround_asyncio263():
    yield