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82 lines
2.3 KiB
Python
82 lines
2.3 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 os
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import sys
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from docker.errors import APIError
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import concurrent.futures
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from .const import DEFAULT_MAX_WORKERS
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log = logging.getLogger(__name__)
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def parallel_execute(command, containers, doing_msg, done_msg, **options):
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"""
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Execute a given command upon a list of containers in parallel.
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"""
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max_workers = os.environ.get('COMPOSE_MAX_WORKERS', DEFAULT_MAX_WORKERS)
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stream = codecs.getwriter('utf-8')(sys.stdout)
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lines = []
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errors = {}
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for container in containers:
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write_out_msg(stream, lines, container.name, doing_msg)
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def container_command_execute(container, command, **options):
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try:
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getattr(container, command)(**options)
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except APIError as e:
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errors[container.name] = e.explanation
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with concurrent.futures.ThreadPoolExecutor(max_workers=max_workers) as executor:
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future_container = {
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executor.submit(
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container_command_execute,
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container,
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command,
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**options
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): container for container in containers
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}
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for future in concurrent.futures.as_completed(future_container):
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container = future_container[future]
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write_out_msg(stream, lines, container.name, done_msg)
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if errors:
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for container in errors:
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stream.write("ERROR: for {} {} \n".format(container, errors[container]))
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def write_out_msg(stream, lines, container_name, msg):
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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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if container_name in lines:
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position = lines.index(container_name)
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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(container_name, msg))
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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(container_name)
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stream.write("{}: {}... \r\n".format(container_name, msg))
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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)
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return h.hexdigest()
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