src/bindings/python/simgrid_python.cpp

   1 /* Copyright (c) 2018. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #include "src/kernel/context/Context.hpp"
   7 #include <simgrid/s4u/Actor.hpp>
   8 #include <simgrid/s4u/Engine.hpp>
   9 #include <simgrid/s4u/Host.hpp>
  10 #include <simgrid/s4u/Mailbox.hpp>
  11
  12 #include <pybind11/pybind11.h>
  13 #include <pybind11/stl.h>
  14
  15 #include <memory>
  16 #include <string>
  17 #include <vector>
  18
  19 namespace py = pybind11;
  20 using simgrid::s4u::Actor;
  21 using simgrid::s4u::ActorPtr;
  22 using simgrid::s4u::Engine;
  23 using simgrid::s4u::Host;
  24 using simgrid::s4u::Mailbox;
  25
  26 XBT_LOG_NEW_DEFAULT_CATEGORY(python, "python");
  27
  28 PYBIND11_DECLARE_HOLDER_TYPE(T, boost::intrusive_ptr<T>);
  29
  30 namespace {
  31
  32 static std::string get_simgrid_version()
  33 {
  34   int major, minor, patch;
  35   sg_version_get(&major, &minor, &patch);
  36   return simgrid::xbt::string_printf("%i.%i.%i", major, minor, patch);
  37 }
  38
  39 static std::string simgrid_version = get_simgrid_version();
  40
  41 } // namespace
  42
  43 PYBIND11_MODULE(simgrid, m)
  44 {
  45
  46   m.doc() = "SimGrid userspace API";
  47
  48   m.attr("simgrid_version") = simgrid_version;
  49
  50   // Internal exception used to kill actors and sweep the RAII chimney (free objects living on the stack)
  51   py::object pyStopRequestEx = py::register_exception<simgrid::kernel::context::Context::StopRequest>(m, "ActorKilled");
  52
  53   /* this_actor namespace */
  54   void (*sleep_for_fun)(double) = &simgrid::s4u::this_actor::sleep_for; // pick the right overload
  55   void (*sleep_until_fun)(double) = &simgrid::s4u::this_actor::sleep_until;
  56
  57   py::module m2 = m.def_submodule("this_actor", "Bindings of the s4u::this_actor namespace.");
  58   m2.def("info", [](char* s) { XBT_INFO("%s", s); }, "Display a logging message of default priority.");
  59   m2.def("execute", py::overload_cast<double, double>(&simgrid::s4u::this_actor::execute),
  60          "Block the current actor, computing the given amount of flops at the given priority, see :cpp:func:`void "
  61          "simgrid::s4u::this_actor::execute(double, double)`",
  62          py::arg("flops"), py::arg("priority") = 1);
  63   m2.def("get_host", &simgrid::s4u::this_actor::get_host, "Retrives host on which the current actor is located");
  64   m2.def("migrate", &simgrid::s4u::this_actor::migrate, "Moves the current actor to another host, see :cpp:func:`void simgrid::s4u::this_actor::migrate()`",
  65       py::arg("dest"));
  66   m2.def("sleep_for", sleep_for_fun,
  67       "Block the actor sleeping for that amount of seconds, see :cpp:func:`void simgrid::s4u::this_actor::sleep_for`", py::arg("duration"));
  68   m2.def("sleep_until", sleep_until_fun,
  69       "Block the actor sleeping until the specified timestamp, see :cpp:func:`void simgrid::s4u::this_actor::sleep_until`", py::arg("duration"));
  70   m2.def("suspend", &simgrid::s4u::this_actor::suspend, "Suspend the current actor, that is blocked until resume()ed by another actor. see :cpp:func:`void simgrid::s4u::this_actor::suspend`");
  71   m2.def("yield_", &simgrid::s4u::this_actor::yield,
  72          "Yield the actor, see :cpp:func:`void simgrid::s4u::this_actor::yield()`");
  73   m2.def("exit", &simgrid::s4u::this_actor::exit);
  74
  75   /* Class Engine */
  76   py::class_<Engine>(m, "Engine", "Simulation Engine, see :ref:`class s4u::Engine <API_s4u_Engine>`")
  77       .def(py::init([](std::vector<std::string> args) -> simgrid::s4u::Engine* {
  78         static char noarg[] = {'\0'};
  79         int argc            = args.size();
  80         std::unique_ptr<char* []> argv(new char*[argc + 1]);
  81         for (int i = 0; i != argc; ++i)
  82           argv[i] = args[i].empty() ? noarg : &args[i].front();
  83         argv[argc] = nullptr;
  84         // Currently this can be dangling, we should wrap this somehow.
  85         return new simgrid::s4u::Engine(&argc, argv.get());
  86       }))
  87       .def("get_all_hosts", &Engine::get_all_hosts, "Returns the list of all hosts found in the platform")
  88       .def("get_clock", &Engine::get_clock, "Retrieve the simulation time")
  89       .def("load_platform", &Engine::load_platform,
  90            "Load a platform file describing the environment, see :cpp:func:`simgrid::s4u::Engine::load_platform()`")
  91       .def("load_deployment", &Engine::load_deployment,
  92            "Load a deployment file and launch the actors that it contains, see "
  93            ":cpp:func:`simgrid::s4u::Engine::load_deployment()`")
  94       .def("run", &Engine::run, "Run the simulation")
  95       .def("register_actor",
  96            [pyStopRequestEx](Engine*, std::string name, py::object fun_or_class) {
  97              simgrid::simix::register_function(
  98                  name, [pyStopRequestEx, fun_or_class](std::vector<std::string> args) -> simgrid::simix::ActorCode {
  99                    return [pyStopRequestEx, fun_or_class, args]() {
 100                      try {
 101                        /* Convert the std::vector into a py::tuple */
 102                        py::tuple params(args.size() - 1);
 103                        for (size_t i = 1; i < args.size(); i++)
 104                          params[i - 1] = py::cast(args[i]);
 105
 106                        py::object res = fun_or_class(*params);
 107
 108                        /* If I was passed a class, I just built an instance, so I need to call it now */
 109                        if (py::isinstance<py::function>(res))
 110                          res();
 111                      } catch (py::error_already_set& ex) {
 112                        if (ex.matches(pyStopRequestEx)) {
 113                          XBT_VERB("Actor killed");
 114                          /* Stop here that StopRequest exception which was meant to free the RAII stuff on the stack */
 115                        } else {
 116                          throw;
 117                        }
 118                      }
 119                    };
 120                  });
 121            },
 122            "Registers the main function of an actor, see :cpp:func:`simgrid::s4u::Engine::register_function()`");
 123
 124   /* Class Host */
 125   py::class_<simgrid::s4u::Host, std::unique_ptr<Host, py::nodelete>>(m, "Host", "Simulation Engine, see :ref:`class s4u::Host <API_s4u_Host>`")
 126       .def("by_name", &Host::by_name, "Retrieves a host from its name, or die")
 127       .def("current", &Host::current, "Retrieves the host on which the running actor is located, see :cpp:func:`simgrid::s4u::Host::current()`")
 128       .def_property_readonly("name", [](Host* self) -> const std::string {
 129           return std::string(self->get_name().c_str()); // Convert from xbt::string because of MC
 130         }, "The name of this host")
 131       .def_property_readonly("speed", &Host::get_speed,
 132           "The peak computing speed in flops/s at the current pstate, taking the external load into account, see :cpp:func:`simgrid::s4u::Host::get_speed()`");
 133
 134   /* Class Mailbox */
 135   py::class_<simgrid::s4u::Mailbox, std::unique_ptr<Mailbox, py::nodelete>>(m, "Mailbox", "Mailbox, see :ref:`class s4u::Mailbox <API_s4u_Mailbox>`")
 136       .def("by_name", &Mailbox::by_name, "Retrieve a Mailbox from its name, see :cpp:func:`simgrid::s4u::Mailbox::by_name()`")
 137       .def_property_readonly("name", [](Mailbox* self) -> const std::string {
 138          return std::string(self->get_name().c_str()); // Convert from xbt::string because of MC
 139       }, "The name of that mailbox, see :cpp:func:`simgrid::s4u::Mailbox::get_name()`")
 140       .def("put", [](Mailbox self, py::object data, int size) {
 141         data.inc_ref();
 142         self.put(data.ptr(), size);
 143       }, "Blocking data transmission, see :cpp:func:`void simgrid::s4u::Mailbox::put(void*, uint64_t)`")
 144       .def("get", [](Mailbox self) -> py::object {
 145          py::object data = pybind11::reinterpret_steal<py::object>(pybind11::handle(static_cast<PyObject*>(self.get())));
 146          data.dec_ref();
 147          return data;
 148       }, "Blocking data reception, see :cpp:func:`void* simgrid::s4u::Mailbox::get()`");
 149
 150   /* Class Actor */
 151   py::class_<simgrid::s4u::Actor, ActorPtr>(m, "Actor",
 152                                             "An actor is an independent stream of execution in your distributed "
 153                                             "application, see :ref:`class s4u::Actor <API_s4u_Actor>`")
 154
 155       .def("create",
 156            [pyStopRequestEx](py::str name, py::object host, py::object fun, py::args args) {
 157
 158              return simgrid::s4u::Actor::create(name, host.cast<Host*>(), [fun, args, pyStopRequestEx]() {
 159
 160                try {
 161                  fun(*args);
 162                } catch (py::error_already_set& ex) {
 163                  if (ex.matches(pyStopRequestEx)) {
 164                    XBT_VERB("Actor killed");
 165                    /* Stop here that StopRequest exception which was meant to free the RAII stuff on the stack */
 166                  } else {
 167                    throw;
 168                  }
 169                }
 170              });
 171            },
 172            "Create an actor from a function or an object, see :cpp:func:`simgrid::s4u::Actor::create()`")
 173       .def_property("host", &Actor::get_host, &Actor::migrate, "The host on which this actor is located")
 174       .def("daemonize", &Actor::daemonize,
 175            "This actor will be automatically terminated when the last non-daemon actor finishes, see :cpp:func:`void "
 176            "simgrid::s4u::Actor::daemonize()`")
 177       .def("join", py::overload_cast<double>(&Actor::join),
 178            "Wait for the actor to finish, see :cpp:func:`void simgrid::s4u::Actor::join(double)`", py::arg("timeout"))
 179       .def("migrate", &Actor::migrate,
 180            "Moves that actor to another host, see :cpp:func:`void simgrid::s4u::Actor::migrate()`", py::arg("dest"))
 181       .def("self", &Actor::self, "Retrieves the current actor, see :cpp:func:`void simgrid::s4u::Actor::self()`")
 182       .def("suspend", &Actor::suspend,
 183            "Suspend that actor, that is blocked until resume()ed by another actor. See :cpp:func:`void "
 184            "simgrid::s4u::Actor::suspend()`")
 185       .def("resume", &Actor::resume,
 186            "Resume that actor, that was previously suspend()ed. See :cpp:func:`void simgrid::s4u::Actor::suspend()`");
 187 }