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gns3-server/gns3server/handlers/api/file_handler.py

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#
# Copyright (C) 2015 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import asyncio
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import aiohttp
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from ...web.route import Route
from ...schemas.file import FILE_STREAM_SCHEMA
class FileHandler:
@classmethod
@Route.get(
r"/files/stream",
description="Stream a file from the server",
status_codes={
200: "File retrieved",
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404: "File doesn't exist",
409: "Can't access to file"
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},
input=FILE_STREAM_SCHEMA
)
def read(request, response):
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response.enable_chunked_encoding()
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try:
with open(request.json.get("location"), "rb") as f:
loop = asyncio.get_event_loop()
response.content_type = "application/octet-stream"
response.set_status(200)
# Very important: do not send a content lenght otherwise QT close the connection but curl can consume the Feed
response.content_length = None
response.start(request)
while True:
data = yield from loop.run_in_executor(None, f.read, 16)
if len(data) == 0:
yield from asyncio.sleep(0.1)
else:
response.write(data)
except FileNotFoundError:
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raise aiohttp.web.HTTPNotFound()
except OSError as e:
raise aiohttp.web.HTTPConflict(text=str(e))