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"""Main module of amlight/sdntrace Kytos Network Application. |
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An OpenFlow Data Path Trace. |
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The AmLight SDNTrace is a Kytos Network Application allows users to trace a |
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path directly from the data plane. Originally written for Ryu |
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(github.com/amlight/sdntrace). |
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Steps: |
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1 - User requests a trace using a specific flow characteristic, |
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for example VLAN = 1000 and Dest IP address = 2.2.2.2 |
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2 - REST module inserts trace request in a queue provided by the |
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TraceManager |
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3 - The TraceManager runs the Tracer, basically sending PacketOuts |
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and waiting for PacketIn until reaching a timeout |
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4 - After Timeout, result is provided back to REST that provides it |
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back to user |
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Dependencies: |
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* - amlight/coloring Napp will color all switches |
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At this moment, OpenFlow 1.3 is supported. |
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""" |
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from napps.amlight.sdntrace import settings |
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from napps.amlight.sdntrace.backends.of_parser import process_packet_in |
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from napps.amlight.sdntrace.shared.switches import Switches |
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from napps.amlight.sdntrace.tracing.trace_manager import TraceManager |
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from kytos.core import KytosNApp, rest |
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from kytos.core.helpers import listen_to |
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from kytos.core.rest_api import JSONResponse, Request, get_json_or_400 |
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class Main(KytosNApp): |
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"""Main class of amlight/sdntrace NApp. |
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REST methods: |
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/sdntrace/trace ['PUT'] - request a trace |
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/sdntrace/trace ['GET'] - list of previous trace requests and results |
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/sdntrace/trace/<trace_id> - get the results of trace requested |
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/sdntrace/stats - Show the number of requests received and active |
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/sdntrace/settings - list the settings |
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""" |
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def setup(self): |
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"""Default Kytos/Napps setup call.""" |
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# Create list of switches |
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self.switches = Switches( |
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self.controller.switches |
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) # noqa: E501 pylint: disable=attribute-defined-outside-init |
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# Instantiate TraceManager |
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self.tracing = TraceManager(self.controller) # pylint: disable=W0201 |
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def execute(self): |
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"""Kytos Napp execute method""" |
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def shutdown(self): |
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"""Execute when your napp is unloaded. |
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If you have some cleanup procedure, insert it here. |
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""" |
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self.tracing.stop_traces() |
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@listen_to("kytos/of_core.v0x04.messages.in.ofpt_packet_in") |
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def handle_packet_in(self, event): |
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"""Receives OpenFlow PacketIn msgs and search from trace packets. |
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If process_packet_in returns 0,0,0, it means it is not a probe |
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packet. Otherwise, store the msg for later use by Tracers. |
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Args: |
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event (KycoPacketIn): Received Event |
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""" |
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ethernet, in_port, switch = process_packet_in(event) |
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if not isinstance(ethernet, int): |
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self.tracing.queue_probe_packet(event, ethernet, in_port, switch) |
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@rest("/trace", methods=["PUT"]) |
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def run_trace(self, request: Request) -> JSONResponse: |
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"""Submit a trace request.""" |
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body = get_json_or_400(request, self.controller.loop) |
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return JSONResponse(self.tracing.rest_new_trace(body)) |
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@rest("/trace", methods=["GET"]) |
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def get_results(self, _request: Request) -> JSONResponse: |
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"""List all traces performed so far.""" |
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return JSONResponse(self.tracing.rest_list_results()) |
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@rest("/trace/{trace_id}", methods=["GET"]) |
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def get_result(self, request: Request) -> JSONResponse: |
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"""List All Traces performed since the Napp loaded.""" |
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trace_id = request.path_params["trace_id"] |
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return JSONResponse(self.tracing.rest_get_result(trace_id)) |
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@rest("/stats", methods=["GET"]) |
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def get_stats(self, _request: Request) -> JSONResponse: |
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"""Get statistics.""" |
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return JSONResponse(self.tracing.rest_list_stats()) |
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@staticmethod |
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@rest("/settings", methods=["GET"]) |
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def list_settings(_request: Request) -> JSONResponse: |
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"""List the SDNTrace settings |
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Return: |
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SETTINGS in JSON format |
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""" |
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settings_dict = {} |
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settings_dict["color_field"] = settings.COLOR_FIELD |
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settings_dict["color_value"] = settings.COLOR_VALUE |
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settings_dict["trace_interval"] = settings.TRACE_INTERVAL |
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settings_dict["parallel_traces"] = settings.PARALLEL_TRACES |
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return JSONResponse(settings_dict) |
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kytos-ng /
sdntrace
