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# -*- 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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import sys
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import json
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import jsonschema
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import asyncio
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import aiohttp
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import logging
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import traceback
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log = logging.getLogger(__name__)
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from ..modules.vm_error import VMError
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from .response import Response
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from ..crash_report import CrashReport
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@asyncio.coroutine
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def parse_request(request, input_schema):
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"""Parse body of request and raise HTTP errors in case of problems"""
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content_length = request.content_length
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if content_length is not None and content_length > 0:
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body = yield from request.read()
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try:
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request.json = json.loads(body.decode('utf-8'))
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except ValueError as e:
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raise aiohttp.web.HTTPBadRequest(text="Invalid JSON {}".format(e))
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else:
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request.json = {}
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try:
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jsonschema.validate(request.json, input_schema)
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except jsonschema.ValidationError as e:
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log.error("Invalid input query. JSON schema error: {}".format(e.message))
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raise aiohttp.web.HTTPBadRequest(text="Invalid JSON: {} in schema: {}".format(
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e.message,
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json.dumps(e.schema)))
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return request
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class Route(object):
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""" Decorator adding:
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* json schema verification
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* routing inside handlers
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* documentation information about endpoints
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"""
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_routes = []
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_documentation = {}
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_vm_locks = {}
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@classmethod
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def get(cls, path, *args, **kw):
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return cls._route('GET', path, *args, **kw)
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@classmethod
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def post(cls, path, *args, **kw):
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return cls._route('POST', path, *args, **kw)
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@classmethod
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def put(cls, path, *args, **kw):
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return cls._route('PUT', path, *args, **kw)
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@classmethod
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def delete(cls, path, *args, **kw):
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return cls._route('DELETE', path, *args, **kw)
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@classmethod
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def _route(cls, method, path, *args, **kw):
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# This block is executed only the first time
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output_schema = kw.get("output", {})
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input_schema = kw.get("input", {})
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api_version = kw.get("api_version", 1)
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# If it's a JSON api endpoint just register the endpoint an do nothing
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if api_version is None:
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cls._path = path
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else:
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cls._path = "/v{version}{path}".format(path=path, version=api_version)
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def register(func):
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route = cls._path
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handler = func.__module__.replace("_handler", "").replace("gns3server.handlers.api.", "")
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cls._documentation.setdefault(handler, {})
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cls._documentation[handler].setdefault(route, {"api_version": api_version,
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"methods": []})
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cls._documentation[handler][route]["methods"].append({
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"method": method,
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"status_codes": kw.get("status_codes", {200: "OK"}),
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"parameters": kw.get("parameters", {}),
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"output_schema": output_schema,
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"input_schema": input_schema,
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"description": kw.get("description", ""),
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})
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func = asyncio.coroutine(func)
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@asyncio.coroutine
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def control_schema(request):
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# This block is executed at each method call
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# Non API call
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if api_version is None:
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response = Response(route=route, output_schema=output_schema)
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yield from func(request, response)
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return response
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# API call
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try:
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request = yield from parse_request(request, input_schema)
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response = Response(route=route, output_schema=output_schema)
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yield from func(request, response)
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except aiohttp.web.HTTPException as e:
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response = Response(route=route)
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response.set_status(e.status)
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response.json({"message": e.text, "status": e.status})
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except VMError as e:
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log.error("VM error detected: {type}".format(type=type(e)), exc_info=1)
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response = Response(route=route)
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response.set_status(409)
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response.json({"message": str(e), "status": 409})
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except asyncio.futures.CancelledError as e:
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log.error("Request canceled")
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response = Response(route=route)
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response.set_status(408)
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response.json({"message": "Request canceled", "status": 408})
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except Exception as e:
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log.error("Uncaught exception detected: {type}".format(type=type(e)), exc_info=1)
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response = Response(route=route)
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response.set_status(500)
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CrashReport.instance().capture_exception(request)
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exc_type, exc_value, exc_tb = sys.exc_info()
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lines = traceback.format_exception(exc_type, exc_value, exc_tb)
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if api_version is not None:
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tb = "".join(lines)
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response.json({"message": tb, "status": 500})
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else:
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tb = "\n".join(lines)
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response.html("<h1>Internal error</h1><pre>{}</pre>".format(tb))
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return response
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@asyncio.coroutine
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def vm_concurrency(request):
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"""
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To avoid strange effect we prevent concurrency
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between the same instance of the vm
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"""
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if "vm_id" in request.match_info or "device_id" in request.match_info:
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vm_id = request.match_info.get("vm_id")
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if vm_id is None:
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vm_id = request.match_info["device_id"]
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cls._vm_locks.setdefault(vm_id, {"lock": asyncio.Lock(), "concurrency": 0})
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cls._vm_locks[vm_id]["concurrency"] += 1
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with (yield from cls._vm_locks[vm_id]["lock"]):
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response = yield from control_schema(request)
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cls._vm_locks[vm_id]["concurrency"] -= 1
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# No more waiting requests, garbage collect the lock
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if cls._vm_locks[vm_id]["concurrency"] <= 0:
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del cls._vm_locks[vm_id]
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else:
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response = yield from control_schema(request)
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return response
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cls._routes.append((method, cls._path, vm_concurrency))
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return vm_concurrency
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return register
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@classmethod
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def get_routes(cls):
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return cls._routes
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@classmethod
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def get_documentation(cls):
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return cls._documentation
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