mirror of https://github.com/docker/docs.git
109 lines
2.8 KiB
Python
109 lines
2.8 KiB
Python
import codecs
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import hashlib
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import json
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import logging
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import sys
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from threading import Thread
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import six
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from docker.errors import APIError
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from six.moves.queue import Empty
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from six.moves.queue import Queue
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log = logging.getLogger(__name__)
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def parallel_execute(objects, obj_callable, msg_index, msg):
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"""
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For a given list of objects, call the callable passing in the first
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object we give it.
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"""
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stream = get_output_stream()
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lines = []
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errors = {}
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for obj in objects:
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write_out_msg(stream, lines, msg_index(obj), msg)
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q = Queue()
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def inner_execute_function(an_callable, parameter, msg_index):
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try:
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result = an_callable(parameter)
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except APIError as e:
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errors[msg_index] = e.explanation
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result = "error"
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except Exception as e:
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errors[msg_index] = e
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result = 'unexpected_exception'
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q.put((msg_index, result))
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for an_object in objects:
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t = Thread(
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target=inner_execute_function,
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args=(obj_callable, an_object, msg_index(an_object)),
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)
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t.daemon = True
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t.start()
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done = 0
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total_to_execute = len(objects)
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while done < total_to_execute:
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try:
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msg_index, result = q.get(timeout=1)
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if result == 'unexpected_exception':
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raise errors[msg_index]
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if result == 'error':
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write_out_msg(stream, lines, msg_index, msg, status='error')
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else:
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write_out_msg(stream, lines, msg_index, msg)
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done += 1
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except Empty:
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pass
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if errors:
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stream.write("\n")
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for error in errors:
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stream.write("ERROR: for {} {} \n".format(error, errors[error]))
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def get_output_stream(stream=sys.stdout):
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if six.PY3:
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return stream
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return codecs.getwriter('utf-8')(stream)
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def write_out_msg(stream, lines, msg_index, msg, status="done"):
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"""
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Using special ANSI code characters we can write out the msg over the top of
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a previous status message, if it exists.
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"""
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obj_index = msg_index
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if msg_index in lines:
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position = lines.index(obj_index)
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diff = len(lines) - position
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# move up
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stream.write("%c[%dA" % (27, diff))
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# erase
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stream.write("%c[2K\r" % 27)
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stream.write("{} {}... {}\n".format(msg, obj_index, status))
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# move back down
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stream.write("%c[%dB" % (27, diff))
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else:
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diff = 0
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lines.append(obj_index)
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stream.write("{} {}... \r\n".format(msg, obj_index))
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stream.flush()
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def json_hash(obj):
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dump = json.dumps(obj, sort_keys=True, separators=(',', ':'))
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h = hashlib.sha256()
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h.update(dump.encode('utf8'))
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return h.hexdigest()
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