# -*- coding: utf-8 -*-
#
# 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 .
import sys
import json
import jsonschema
import asyncio
import aiohttp
import logging
import traceback
log = logging.getLogger(__name__)
from ..modules.vm_error import VMError
from .response import Response
from ..crash_report import CrashReport
@asyncio.coroutine
def parse_request(request, input_schema):
"""Parse body of request and raise HTTP errors in case of problems"""
content_length = request.content_length
if content_length is not None and content_length > 0:
body = yield from request.read()
try:
request.json = json.loads(body.decode('utf-8'))
except ValueError as e:
raise aiohttp.web.HTTPBadRequest(text="Invalid JSON {}".format(e))
else:
request.json = {}
try:
jsonschema.validate(request.json, input_schema)
except jsonschema.ValidationError as e:
log.error("Invalid input query. JSON schema error: {}".format(e.message))
raise aiohttp.web.HTTPBadRequest(text="Invalid JSON: {} in schema: {}".format(
e.message,
json.dumps(e.schema)))
return request
class Route(object):
""" Decorator adding:
* json schema verification
* routing inside handlers
* documentation information about endpoints
"""
_routes = []
_documentation = {}
_vm_locks = {}
@classmethod
def get(cls, path, *args, **kw):
return cls._route('GET', path, *args, **kw)
@classmethod
def post(cls, path, *args, **kw):
return cls._route('POST', path, *args, **kw)
@classmethod
def put(cls, path, *args, **kw):
return cls._route('PUT', path, *args, **kw)
@classmethod
def delete(cls, path, *args, **kw):
return cls._route('DELETE', path, *args, **kw)
@classmethod
def _route(cls, method, path, *args, **kw):
# This block is executed only the first time
output_schema = kw.get("output", {})
input_schema = kw.get("input", {})
api_version = kw.get("api_version", 1)
# If it's a JSON api endpoint just register the endpoint an do nothing
if api_version is None:
cls._path = path
else:
cls._path = "/v{version}{path}".format(path=path, version=api_version)
def register(func):
route = cls._path
handler = func.__module__.replace("_handler", "").replace("gns3server.handlers.api.", "")
cls._documentation.setdefault(handler, {})
cls._documentation[handler].setdefault(route, {"api_version": api_version,
"methods": []})
cls._documentation[handler][route]["methods"].append({
"method": method,
"status_codes": kw.get("status_codes", {200: "OK"}),
"parameters": kw.get("parameters", {}),
"output_schema": output_schema,
"input_schema": input_schema,
"description": kw.get("description", ""),
})
func = asyncio.coroutine(func)
@asyncio.coroutine
def control_schema(request):
# This block is executed at each method call
# Non API call
if api_version is None:
response = Response(route=route, output_schema=output_schema)
yield from func(request, response)
return response
# API call
try:
request = yield from parse_request(request, input_schema)
response = Response(route=route, output_schema=output_schema)
yield from func(request, response)
except aiohttp.web.HTTPException as e:
response = Response(route=route)
response.set_status(e.status)
response.json({"message": e.text, "status": e.status})
except VMError as e:
log.error("VM error detected: {type}".format(type=type(e)), exc_info=1)
response = Response(route=route)
response.set_status(409)
response.json({"message": str(e), "status": 409})
except asyncio.futures.CancelledError as e:
log.error("Request canceled")
response = Response(route=route)
response.set_status(408)
response.json({"message": "Request canceled", "status": 408})
except Exception as e:
log.error("Uncaught exception detected: {type}".format(type=type(e)), exc_info=1)
response = Response(route=route)
response.set_status(500)
CrashReport.instance().capture_exception(request)
exc_type, exc_value, exc_tb = sys.exc_info()
lines = traceback.format_exception(exc_type, exc_value, exc_tb)
if api_version is not None:
tb = "".join(lines)
response.json({"message": tb, "status": 500})
else:
tb = "\n".join(lines)
response.html("Internal error
{}".format(tb))
return response
@asyncio.coroutine
def vm_concurrency(request):
"""
To avoid strange effect we prevent concurrency
between the same instance of the vm
"""
if "vm_id" in request.match_info or "device_id" in request.match_info:
vm_id = request.match_info.get("vm_id")
if vm_id is None:
vm_id = request.match_info["device_id"]
cls._vm_locks.setdefault(vm_id, {"lock": asyncio.Lock(), "concurrency": 0})
cls._vm_locks[vm_id]["concurrency"] += 1
with (yield from cls._vm_locks[vm_id]["lock"]):
response = yield from control_schema(request)
cls._vm_locks[vm_id]["concurrency"] -= 1
# No more waiting requests, garbage collect the lock
if cls._vm_locks[vm_id]["concurrency"] <= 0:
del cls._vm_locks[vm_id]
else:
response = yield from control_schema(request)
return response
cls._routes.append((method, cls._path, vm_concurrency))
return vm_concurrency
return register
@classmethod
def get_routes(cls):
return cls._routes
@classmethod
def get_documentation(cls):
return cls._documentation