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// This file is part of CAF, the C++ Actor Framework. See the file LICENSE in
// the main distribution directory for license terms and copyright or visit
// https://github.com/actor-framework/actor-framework/blob/master/LICENSE.
#define CAF_SUITE response_promise
#include "caf/response_promise.hpp"
#include "core-test.hpp"
using namespace caf;
using namespace std::literals;
namespace {
behavior adder() {
return {
[](int x, int y) { return x + y; },
[](ok_atom) {},
};
}
behavior delegator(event_based_actor* self, actor worker) {
return {
[=](int x, int y) {
auto promise = self->make_response_promise();
return promise.delegate(worker, x, y);
},
[=](ok_atom) {
auto promise = self->make_response_promise();
return promise.delegate(worker, ok_atom_v);
},
};
}
behavior requester_v1(event_based_actor* self, actor worker) {
return {
[=](int x, int y) {
auto rp = self->make_response_promise();
self->request(worker, infinite, x, y)
.then(
[rp](int result) mutable {
CHECK(rp.pending());
rp.deliver(result);
},
[rp](error err) mutable {
CHECK(rp.pending());
rp.deliver(std::move(err));
});
return rp;
},
[=](ok_atom) {
auto rp = self->make_response_promise();
self->request(worker, infinite, ok_atom_v)
.then(
[rp]() mutable {
CHECK(rp.pending());
rp.deliver();
},
[rp](error err) mutable {
CHECK(rp.pending());
rp.deliver(std::move(err));
});
return rp;
},
};
}
behavior requester_v2(event_based_actor* self, actor worker) {
return {
[=](int x, int y) {
auto rp = self->make_response_promise();
auto deliver = [rp](expected<int> x) mutable {
CHECK(rp.pending());
rp.deliver(std::move(x));
};
self->request(worker, infinite, x, y)
.then([deliver](int result) mutable { deliver(result); },
[deliver](error err) mutable { deliver(std::move(err)); });
return rp;
},
[=](ok_atom) {
auto rp = self->make_response_promise();
auto deliver = [rp](expected<void> x) mutable {
CHECK(rp.pending());
rp.deliver(std::move(x));
};
self->request(worker, infinite, ok_atom_v)
.then([deliver]() mutable { deliver({}); },
[deliver](error err) mutable { deliver(std::move(err)); });
return rp;
},
};
}
} // namespace
BEGIN_FIXTURE_SCOPE(test_coordinator_fixture<>)
SCENARIO("response promises allow delaying of response messages") {
auto adder_hdl = sys.spawn(adder);
std::map<std::string, actor> impls;
impls["with a value or an error"] = sys.spawn(requester_v1, adder_hdl);
impls["with an expected<T>"] = sys.spawn(requester_v2, adder_hdl);
for (auto& [desc, hdl] : impls) {
GIVEN("a dispatcher that calls deliver " << desc << " on its promise") {
WHEN("sending a request with two integers to the dispatcher") {
inject((int, int), from(self).to(hdl).with(3, 4));
THEN("clients receive the response from the dispatcher") {
expect((int, int), from(hdl).to(adder_hdl).with(3, 4));
expect((int), from(adder_hdl).to(hdl).with(7));
expect((int), from(hdl).to(self).with(7));
}
}
WHEN("sending ok_atom to the dispatcher synchronously") {
auto res = self->request(hdl, infinite, ok_atom_v);
auto fetch_result = [&] {
message result;
res.receive([] {}, // void result
[&](const error& reason) {
result = make_message(reason);
});
return result;
};
THEN("clients receive an empty response from the dispatcher") {
expect((ok_atom), from(self).to(hdl));
expect((ok_atom), from(hdl).to(adder_hdl));
expect((void), from(adder_hdl).to(hdl));
CHECK(fetch_result().empty());
}
}
WHEN("sending ok_atom to the dispatcher asynchronously") {
THEN("clients receive no response from the dispatcher") {
inject((ok_atom), from(self).to(hdl).with(ok_atom_v));
expect((ok_atom), from(hdl).to(adder_hdl));
expect((void), from(adder_hdl).to(hdl));
CHECK(self->mailbox().empty());
}
}
}
}
}
SCENARIO("response promises send errors when broken") {
auto adder_hdl = sys.spawn(adder);
auto hdl = sys.spawn(requester_v1, adder_hdl);
GIVEN("a dispatcher, and adder and a client") {
WHEN("the dispatcher terminates before calling deliver on its promise") {
inject((int, int), from(self).to(hdl).with(3, 4));
inject((exit_msg),
to(hdl).with(exit_msg{hdl.address(), exit_reason::kill}));
THEN("clients receive a broken_promise error") {
expect((error), from(hdl).to(self).with(sec::broken_promise));
}
}
}
}
SCENARIO("response promises allow delegation") {
GIVEN("a dispatcher that calls delegate on its promise") {
auto adder_hdl = sys.spawn(adder);
auto hdl = sys.spawn(delegator, adder_hdl);
WHEN("sending a request to the dispatcher") {
inject((int, int), from(self).to(hdl).with(3, 4));
THEN("clients receive the response from the adder") {
expect((int, int), from(self).to(adder_hdl).with(3, 4));
expect((int), from(adder_hdl).to(self).with(7));
}
}
}
}
END_FIXTURE_SCOPE()
CAF_TEST("GH-1306 regression") {
actor_system_config cfg;
cfg.set("caf.scheduler.max-threads", 1u);
actor_system sys{cfg};
auto aut = sys.spawn([](caf::event_based_actor* self) -> behavior {
return {
[self](int32_t x) {
auto rp = self->make_response_promise();
self->run_delayed(1h, [rp, x]() mutable { rp.deliver(x + x); });
return rp;
},
};
});
scoped_actor self{sys};
self->send(aut, 21);
self->send_exit(aut, exit_reason::kill);
aut = nullptr;
// Destroying the now obsolete action now destroys the promise. If the promise
// access the self pointer this triggers a heap-use-after-free since the AUT
// has been destroyed at this point.
}
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