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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/gtest/gtest.h>
#include <vespa/slobrok/server/rpc_mapping_monitor.h>
#include <vespa/fnet/transport_debugger.h>
#include <vespa/fnet/transport_thread.h>
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/vespalib/util/require.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <map>
using namespace vespalib;
using namespace slobrok;
using vespalib::make_string_short::fmt;
// simple rpc server implementing the required slobrok call-back API
struct Server : FRT_Invokable {
fnet::frt::StandaloneFRT frt;
std::vector<vespalib::string> names;
size_t inject_fail_cnt;
FNET_Connection *last_conn;
void set_last_conn(FNET_Connection *conn) {
if (last_conn) {
last_conn->internal_subref();
}
last_conn = conn;
if (last_conn) {
last_conn->internal_addref();
}
}
Server(fnet::TimeTools::SP time_tools)
: frt(fnet::TransportConfig().time_tools(time_tools)),
names(),
inject_fail_cnt(0),
last_conn(nullptr)
{
FRT_ReflectionBuilder rb(&frt.supervisor());
rb.DefineMethod("slobrok.callback.listNamesServed", "", "S", FRT_METHOD(Server::rpc_listNamesServed), this);
rb.DefineMethod("slobrok.callback.notifyUnregistered", "s", "", FRT_METHOD(Server::rpc_notifyUnregistered), this);
REQUIRE(frt.supervisor().Listen(0));
}
~Server() { set_last_conn(nullptr); }
vespalib::string spec() const { return fmt("tcp/%d", frt.supervisor().GetListenPort()); }
FNET_Transport &transport() { return *frt.supervisor().GetTransport(); }
void rpc_listNamesServed(FRT_RPCRequest *req) {
set_last_conn(req->GetConnection());
if (inject_fail_cnt > 0) {
req->SetError(FRTE_RPC_METHOD_FAILED, "fail injected by unit test");
--inject_fail_cnt;
} else {
FRT_Values &dst = *req->GetReturn();
FRT_StringValue *names_out = dst.AddStringArray(names.size());
for (size_t i = 0; i < names.size(); ++i) {
dst.SetString(&names_out[i], names[i].c_str());
}
}
}
void rpc_notifyUnregistered(FRT_RPCRequest *) {}
};
enum class State { ANY, UP, DOWN };
// Run-Length-Encoded historic state samples for a single service mapping
struct States {
struct Entry {
State state;
size_t cnt;
};
std::vector<Entry> hist;
State state() const { return hist.back().state; }
States() : hist({{State::ANY, 0}}) {}
void sample(State state) {
if (state == hist.back().state) {
++hist.back().cnt;
} else {
hist.push_back(Entry{state, 1});
}
}
size_t samples(State state = State::ANY) const {
size_t n = 0;
for (const auto &entry: hist) {
if ((entry.state == state) || (state == State::ANY)) {
n += entry.cnt;
}
}
return n;
}
};
// history of which call-backs we have gotten so far
struct History : MappingMonitorOwner {
std::map<ServiceMapping, States> map;
void up(const ServiceMapping &mapping) override { map[mapping].sample(State::UP); }
void down(const ServiceMapping &mapping) override { map[mapping].sample(State::DOWN); }
};
struct RpcMappingMonitorTest : public ::testing::Test {
fnet::TransportDebugger debugger;
fnet::frt::StandaloneFRT my_frt;
Server a;
Server b;
History hist;
std::unique_ptr<RpcMappingMonitor> monitor;
ServiceMapping foo_a;
ServiceMapping bar_a;
ServiceMapping baz_b;
RpcMappingMonitorTest()
: debugger(),
my_frt(fnet::TransportConfig().time_tools(debugger.time_tools())),
a(debugger.time_tools()),
b(debugger.time_tools()),
hist(),
monitor(),
foo_a("foo", a.spec()),
bar_a("bar", a.spec()),
baz_b("baz", b.spec())
{
debugger.attach({*my_frt.supervisor().GetTransport(), a.transport(), b.transport()});
monitor = std::make_unique<RpcMappingMonitor>(my_frt.supervisor(), hist);
a.names.push_back(foo_a.name);
a.names.push_back(bar_a.name);
b.names.push_back(baz_b.name);
}
~RpcMappingMonitorTest() {
monitor.reset();
debugger.detach();
}
};
TEST_F(RpcMappingMonitorTest, services_can_be_monitored) {
monitor->start(foo_a, false);
monitor->start(bar_a, false);
monitor->start(baz_b, false);
EXPECT_TRUE(debugger.step_until([&]() {
return ((hist.map[foo_a].samples() >= 3) &&
(hist.map[bar_a].samples() >= 3) &&
(hist.map[baz_b].samples() >= 3)); }));
EXPECT_EQ(hist.map[foo_a].samples(State::DOWN), 0);
EXPECT_EQ(hist.map[bar_a].samples(State::DOWN), 0);
EXPECT_EQ(hist.map[baz_b].samples(State::DOWN), 0);
}
TEST_F(RpcMappingMonitorTest, hurry_means_faster) {
monitor->start(foo_a, false);
monitor->start(baz_b, true);
auto t0 = debugger.time();
EXPECT_TRUE(debugger.step_until([&]() {
return ((hist.map[baz_b].samples() > 0)); }));
EXPECT_EQ(hist.map[foo_a].samples(), 0);
auto t1 = debugger.time();
EXPECT_TRUE(debugger.step_until([&]() {
return ((hist.map[foo_a].samples() > 0)); }));
auto t2 = debugger.time();
fprintf(stderr, "hurry: ~%" PRIu64 " ms, normal: ~%" PRIu64 " ms\n", count_ms(t1-t0), count_ms(t2-t0));
EXPECT_GT((t2 - t0), 10 * (t1 - t0));
EXPECT_EQ(hist.map[foo_a].state(), State::UP);
EXPECT_EQ(hist.map[baz_b].state(), State::UP);
}
TEST_F(RpcMappingMonitorTest, stop_means_stop) {
monitor->start(foo_a, false);
monitor->start(baz_b, true);
EXPECT_TRUE(debugger.step_until([&]() {
return ((hist.map[baz_b].samples() == 1)); }));
monitor->stop(baz_b);
EXPECT_TRUE(debugger.step_until([&]() {
return ((hist.map[foo_a].samples() == 3)); }));
EXPECT_EQ(hist.map[baz_b].samples(), 1);
EXPECT_EQ(hist.map[foo_a].state(), State::UP);
EXPECT_EQ(hist.map[baz_b].state(), State::UP);
}
TEST_F(RpcMappingMonitorTest, health_checks_may_fail) {
ServiceMapping bad_spec("foo", "this spec is invalid");
ServiceMapping failed_ping("foo", a.spec());
ServiceMapping missing_name("foo", b.spec());
a.inject_fail_cnt = 2;
monitor->start(bad_spec, true);
monitor->start(failed_ping, true);
monitor->start(missing_name, true);
EXPECT_TRUE(debugger.step_until([&]() {
return (hist.map[failed_ping].state() == State::UP); }));
EXPECT_EQ(hist.map[bad_spec].state(), State::DOWN);
EXPECT_EQ(hist.map[missing_name].state(), State::DOWN);
EXPECT_EQ(hist.map[failed_ping].samples(State::DOWN), 2);
EXPECT_EQ(hist.map[bad_spec].samples(State::UP), 0);
EXPECT_EQ(hist.map[missing_name].samples(State::UP), 0);
}
TEST_F(RpcMappingMonitorTest, loss_of_idle_connection_is_detected_and_recovered) {
monitor->start(foo_a, true);
EXPECT_TRUE(debugger.step_until([&]() {
return (hist.map[foo_a].state() == State::UP); }));
ASSERT_TRUE(a.last_conn);
a.last_conn->Owner()->Close(a.last_conn);
a.set_last_conn(nullptr);
EXPECT_TRUE(debugger.step_until([&]() {
return (hist.map[foo_a].state() == State::DOWN); }));
// down without new rpc check, will re-connect and come back up
EXPECT_FALSE(a.last_conn);
EXPECT_TRUE(debugger.step_until([&]() {
return (hist.map[foo_a].state() == State::UP); }));
EXPECT_EQ(hist.map[foo_a].samples(State::DOWN), 1);
}
TEST_F(RpcMappingMonitorTest, up_connection_is_reused) {
monitor->start(foo_a, true);
EXPECT_TRUE(debugger.step_until([&]() { return (a.last_conn); }));
auto my_conn = a.last_conn;
a.last_conn = nullptr;
EXPECT_TRUE(debugger.step_until([&]() { return (a.last_conn); }));
EXPECT_EQ(a.last_conn, my_conn);
my_conn->internal_subref();
EXPECT_EQ(hist.map[foo_a].state(), State::UP);
}
TEST_F(RpcMappingMonitorTest, detect_ping_interval) {
monitor->start(foo_a, true);
EXPECT_TRUE(debugger.step_until([&]() { return (a.last_conn); }));
auto t1 = debugger.time();
a.set_last_conn(nullptr);
EXPECT_TRUE(debugger.step_until([&]() { return (a.last_conn); }));
auto t2 = debugger.time();
fprintf(stderr, "ping interval: ~%" PRIu64 " ms\n", count_ms(t2-t1));
}
GTEST_MAIN_RUN_ALL_TESTS()
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