mirror of
https://github.com/GNS3/gns3-server
synced 2024-12-26 16:58:28 +00:00
222 lines
8.4 KiB
Python
222 lines
8.4 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2015 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Docker server module.
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"""
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import sys
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import asyncio
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import logging
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import aiohttp
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import json
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from gns3server.utils import parse_version
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from gns3server.utils.asyncio import locked_coroutine
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from gns3server.compute.base_manager import BaseManager
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from gns3server.compute.docker.docker_vm import DockerVM
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from gns3server.compute.docker.docker_error import DockerError, DockerHttp304Error, DockerHttp404Error
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log = logging.getLogger(__name__)
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DOCKER_MINIMUM_API_VERSION = "1.21"
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class Docker(BaseManager):
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_NODE_CLASS = DockerVM
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def __init__(self):
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super().__init__()
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self._server_url = '/var/run/docker.sock'
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self._connected = False
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# Allow locking during ubridge operations
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self.ubridge_lock = asyncio.Lock()
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self._connector = None
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self._session = None
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@asyncio.coroutine
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def _check_connection(self):
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if not self._connected:
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try:
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self._connected = True
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connector = self.connector()
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version = yield from self.query("GET", "version")
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except (aiohttp.errors.ClientOSError, FileNotFoundError):
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self._connected = False
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raise DockerError("Can't connect to docker daemon")
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if parse_version(version["ApiVersion"]) < parse_version(DOCKER_MINIMUM_API_VERSION):
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raise DockerError("Docker API version is {}. GNS3 requires a minimum API version of {}".format(version["ApiVersion"], DOCKER_MINIMUM_API_VERSION))
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def connector(self):
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if self._connector is None or self._connector.closed:
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if not sys.platform.startswith("linux"):
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raise DockerError("Docker is supported only on Linux")
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try:
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self._connector = aiohttp.connector.UnixConnector(self._server_url, conn_timeout=2, limit=None)
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except (aiohttp.errors.ClientOSError, FileNotFoundError):
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raise DockerError("Can't connect to docker daemon")
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return self._connector
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@asyncio.coroutine
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def unload(self):
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yield from super().unload()
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if self._connected:
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if self._connector and not self._connector.closed:
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yield from self._connector.close()
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@asyncio.coroutine
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def query(self, method, path, data={}, params={}):
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"""
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Make a query to the docker daemon and decode the request
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:param method: HTTP method
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:param path: Endpoint in API
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:param data: Dictionnary with the body. Will be transformed to a JSON
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:param params: Parameters added as a query arg
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"""
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response = yield from self.http_query(method, path, data=data, params=params)
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body = yield from response.read()
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if body and len(body):
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if response.headers['CONTENT-TYPE'] == 'application/json':
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body = json.loads(body.decode("utf-8"))
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else:
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body = body.decode("utf-8")
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log.debug("Query Docker %s %s params=%s data=%s Response: %s", method, path, params, data, body)
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return body
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@asyncio.coroutine
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def http_query(self, method, path, data={}, params={}, timeout=300):
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"""
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Make a query to the docker daemon
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:param method: HTTP method
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:param path: Endpoint in API
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:param data: Dictionnary with the body. Will be transformed to a JSON
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:param params: Parameters added as a query arg
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:param timeout: Timeout
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:returns: HTTP response
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"""
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data = json.dumps(data)
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url = "http://docker/" + path
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if timeout is None:
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timeout = 60 * 60 * 24 * 31 # One month timeout
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try:
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if path != "version": # version is use by check connection
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yield from self._check_connection()
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if self._session is None or self._session.closed:
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connector = self.connector()
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self._session = aiohttp.ClientSession(connector=connector)
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response = yield from self._session.request(
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method,
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url,
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params=params,
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data=data,
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headers={"content-type": "application/json", },
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timeout=timeout
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)
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except (aiohttp.ClientResponseError, aiohttp.ClientOSError) as e:
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raise DockerError("Docker has returned an error: {}".format(str(e)))
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if response.status >= 300:
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body = yield from response.read()
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try:
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body = json.loads(body.decode("utf-8"))["message"]
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except ValueError:
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pass
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log.debug("Query Docker %s %s params=%s data=%s Response: %s", method, path, params, data, body)
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if response.status == 304:
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raise DockerHttp304Error("Docker has returned an error: {} {}".format(response.status, body))
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elif response.status == 404:
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raise DockerHttp404Error("Docker has returned an error: {} {}".format(response.status, body))
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else:
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raise DockerError("Docker has returned an error: {} {}".format(response.status, body))
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return response
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@asyncio.coroutine
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def websocket_query(self, path, params={}):
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"""
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Open a websocket connection
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:param path: Endpoint in API
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:param params: Parameters added as a query arg
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:returns: Websocket
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"""
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url = "http://docker/" + path
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connection = yield from aiohttp.ws_connect(url,
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connector=self.connector(),
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origin="http://docker",
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autoping=True)
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return connection
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@locked_coroutine
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def pull_image(self, image, progress_callback=None):
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"""
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Pull image from docker repository
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:params image: Image name
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:params progress_callback: A function that receive a log message about image download progress
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"""
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try:
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yield from self.query("GET", "images/{}/json".format(image))
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return # We already have the image skip the download
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except DockerHttp404Error:
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pass
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if progress_callback:
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progress_callback("Pull {} from docker hub".format(image))
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response = yield from self.http_query("POST", "images/create", params={"fromImage": image}, timeout=None)
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# The pull api will stream status via an HTTP JSON stream
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content = ""
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while True:
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chunk = yield from response.content.read(1024)
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if not chunk:
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break
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content += chunk.decode("utf-8")
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try:
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while True:
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content = content.lstrip(" \r\n\t")
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answer, index = json.JSONDecoder().raw_decode(content)
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if "progress" in answer and progress_callback:
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progress_callback("Pulling image {}:{}: {}".format(image, answer["id"], answer["progress"]))
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content = content[index:]
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except ValueError: # Partial JSON
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pass
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response.close()
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if progress_callback:
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progress_callback("Success pulling image {}".format(image))
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@asyncio.coroutine
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def list_images(self):
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"""Gets Docker image list.
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:returns: list of dicts
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:rtype: list
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"""
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images = []
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for image in (yield from self.query("GET", "images/json", params={"all": 0})):
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if image['RepoTags']:
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for tag in image['RepoTags']:
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if tag != "<none>:<none>":
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images.append({'image': tag})
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return sorted(images, key=lambda i: i['image'])
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