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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/test_kit.h>
#include <vespa/vespalib/testkit/time_bomb.h>
#include <vespa/vespalib/net/socket_address.h>
#include <vespa/vespalib/net/selector.h>
#include <vespa/vespalib/net/socket_utils.h>
#include <thread>
#include <functional>
#include <chrono>
#include <fcntl.h>
using namespace vespalib;
struct SocketPair {
SocketHandle a;
SocketHandle b;
SocketPair(int a_fd, int b_fd) : a(a_fd), b(b_fd) {}
SocketPair(SocketPair &&) = default;
SocketPair &operator=(SocketPair &&) = default;
static SocketPair create() {
int sockets[2];
socketutils::nonblocking_socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
return SocketPair(sockets[0], sockets[1]);
}
~SocketPair() {}
};
struct Context {
int fd;
bool can_read;
bool can_write;
Context(int fd_in) : fd(fd_in), can_read(false), can_write(false) {}
void reset() {
can_read = false;
can_write = false;
}
};
struct Fixture {
bool wakeup;
Selector<Context> selector;
std::vector<SocketPair> sockets;
std::vector<Context> contexts;
Fixture(size_t size, bool read_enabled, bool write_enabled) : wakeup(false), selector(), sockets(), contexts() {
for (size_t i = 0; i < size; ++i) {
sockets.push_back(SocketPair::create());
contexts.push_back(Context(sockets.back().a.get()));
}
for (auto &ctx: contexts) {
selector.add(ctx.fd, ctx, read_enabled, write_enabled);
}
}
void update(size_t idx, bool read, bool write) {
Context &ctx = contexts[idx];
selector.update(ctx.fd, ctx, read, write);
}
bool write(size_t idx, const char *str) {
size_t len = strlen(str);
ssize_t res = ::write(sockets[idx].b.get(), str, len);
return (res == ssize_t(len));
}
bool write_self(size_t idx, const char *str) {
size_t len = strlen(str);
ssize_t res = ::write(sockets[idx].a.get(), str, len);
return (res == ssize_t(len));
}
bool read(size_t idx, size_t len) {
char buf[128];
ssize_t res = ::read(sockets[idx].a.get(), buf, len);
return (res == ssize_t(len));
}
Fixture &reset() {
wakeup = false;
for (auto &ctx: contexts) {
ctx.reset();
}
return *this;
}
Fixture &poll(int timeout_ms = 60000) {
selector.poll(timeout_ms);
auto dispatchResult = selector.dispatch(*this);
if (wakeup) {
EXPECT_TRUE(dispatchResult == SelectorDispatchResult::WAKEUP_CALLED);
} else {
EXPECT_TRUE(dispatchResult == SelectorDispatchResult::NO_WAKEUP);
}
return *this;
}
void verify(bool expect_wakeup, std::vector<std::pair<bool,bool> > expect_events) {
EXPECT_EQUAL(expect_wakeup, wakeup);
ASSERT_EQUAL(expect_events.size(), contexts.size());
for (size_t i = 0; i < expect_events.size(); ++i) {
EXPECT_EQUAL(expect_events[i].first, contexts[i].can_read);
EXPECT_EQUAL(expect_events[i].second, contexts[i].can_write);
}
}
// selector callbacks
void handle_wakeup() { wakeup = true; }
void handle_event(Context &ctx, bool read, bool write) {
ctx.can_read = read;
ctx.can_write = write;
}
};
constexpr std::pair<bool,bool> none = std::make_pair(false, false);
constexpr std::pair<bool,bool> in = std::make_pair(true, false);
constexpr std::pair<bool,bool> out = std::make_pair(false, true);
constexpr std::pair<bool,bool> both = std::make_pair(true, true);
TEST_F("require that basic events trigger correctly", Fixture(1, true, true)) {
TEST_DO(f1.reset().poll().verify(false, {out}));
EXPECT_TRUE(f1.write(0, "test"));
TEST_DO(f1.reset().poll().verify(false, {both}));
f1.update(0, true, false);
TEST_DO(f1.reset().poll().verify(false, {in}));
f1.update(0, false, true);
TEST_DO(f1.reset().poll().verify(false, {out}));
f1.update(0, false, false);
TEST_DO(f1.reset().poll(10).verify(false, {none}));
f1.update(0, true, true);
f1.selector.wakeup();
TEST_DO(f1.reset().poll().verify(true, {both}));
TEST_DO(f1.reset().poll().verify(false, {both}));
}
TEST_FFF("require that sources can be added with some events disabled",
Fixture(1, true, false), Fixture(1, false, true), Fixture(1, false, false))
{
EXPECT_TRUE(f1.write(0, "test"));
EXPECT_TRUE(f2.write(0, "test"));
EXPECT_TRUE(f3.write(0, "test"));
TEST_DO(f1.reset().poll().verify(false, {in}));
TEST_DO(f2.reset().poll().verify(false, {out}));
TEST_DO(f3.reset().poll(10).verify(false, {none}));
f1.update(0, true, true);
f2.update(0, true, true);
f3.update(0, true, true);
TEST_DO(f1.reset().poll().verify(false, {both}));
TEST_DO(f2.reset().poll().verify(false, {both}));
TEST_DO(f3.reset().poll().verify(false, {both}));
}
TEST_F("require that multiple sources can be selected on", Fixture(5, true, false)) {
TEST_DO(f1.reset().poll(10).verify(false, {none, none, none, none, none}));
EXPECT_TRUE(f1.write(1, "test"));
EXPECT_TRUE(f1.write(3, "test"));
TEST_DO(f1.reset().poll().verify(false, {none, in, none, in, none}));
EXPECT_TRUE(f1.read(1, strlen("test")));
EXPECT_TRUE(f1.read(3, strlen("te")));
TEST_DO(f1.reset().poll().verify(false, {none, none, none, in, none}));
EXPECT_TRUE(f1.read(3, strlen("st")));
TEST_DO(f1.reset().poll(10).verify(false, {none, none, none, none, none}));
}
TEST_F("require that removed sources no longer produce events", Fixture(2, true, true)) {
TEST_DO(f1.reset().poll().verify(false, {out, out}));
EXPECT_TRUE(f1.write(0, "test"));
EXPECT_TRUE(f1.write(1, "test"));
TEST_DO(f1.reset().poll().verify(false, {both, both}));
f1.selector.remove(f1.contexts[0].fd);
TEST_DO(f1.reset().poll().verify(false, {none, both}));
}
TEST_F("require that filling the output buffer disables write events", Fixture(1, true, true)) {
EXPECT_TRUE(f1.write(0, "test"));
TEST_DO(f1.reset().poll().verify(false, {both}));
size_t buffer_size = 0;
while (f1.write_self(0, "x")) {
++buffer_size;
}
EXPECT_TRUE((errno == EWOULDBLOCK) || (errno == EAGAIN));
fprintf(stderr, "buffer size: %zu\n", buffer_size);
TEST_DO(f1.reset().poll().verify(false, {in}));
}
TEST_MT_FF("require that selector can be woken while waiting for events", 2, Fixture(0, true, false), TimeBomb(60)) {
if (thread_id == 0) {
TEST_DO(f1.reset().poll().verify(true, {}));
} else {
std::this_thread::sleep_for(std::chrono::milliseconds(20));
f1.selector.wakeup();
}
}
TEST_MT_FF("require that selection criteria can be changed while waiting for events", 2, Fixture(1, true, false), TimeBomb(60)) {
if (thread_id == 0) {
TEST_DO(f1.reset().poll().verify(false, {out}));
} else {
std::this_thread::sleep_for(std::chrono::milliseconds(20));
f1.update(0, true, true);
}
}
TEST_MT_FF("require that selection sources can be added while waiting for events", 2, Fixture(0, true, false), TimeBomb(60)) {
if (thread_id == 0) {
TEST_DO(f1.reset().poll().verify(false, {}));
TEST_BARRIER();
} else {
SocketPair pair = SocketPair::create();
Context ctx(pair.a.get());
std::this_thread::sleep_for(std::chrono::milliseconds(20));
f1.selector.add(ctx.fd, ctx, true, true);
TEST_BARRIER();
EXPECT_TRUE(ctx.can_write);
}
}
TEST_MT_FFF("require that single fd selector can wait for read events while handling wakeups correctly",
2, SocketPair(SocketPair::create()), SingleFdSelector(f1.a.get()), TimeBomb(60))
{
if (thread_id == 0) {
EXPECT_EQUAL(f2.wait_readable(), false); // wakeup only
TEST_BARRIER(); // #1
EXPECT_EQUAL(f2.wait_readable(), true); // read only
TEST_BARRIER(); // #2
TEST_BARRIER(); // #3
EXPECT_EQUAL(f2.wait_readable(), true); // read and wakeup
} else {
std::this_thread::sleep_for(std::chrono::milliseconds(20));
f2.wakeup();
TEST_BARRIER(); // #1
vespalib::string msg("test");
std::this_thread::sleep_for(std::chrono::milliseconds(20));
ASSERT_EQUAL(f1.b.write(msg.data(), msg.size()), ssize_t(msg.size()));
TEST_BARRIER(); // #2
f2.wakeup();
TEST_BARRIER(); // #3
}
}
TEST_MT_FFF("require that single fd selector can wait for write events while handling wakeups correctly",
2, SocketPair(SocketPair::create()), SingleFdSelector(f1.a.get()), TimeBomb(60))
{
if (thread_id == 0) {
EXPECT_EQUAL(f2.wait_writable(), true); // write only
TEST_BARRIER(); // #1
TEST_BARRIER(); // #2
EXPECT_EQUAL(f2.wait_writable(), true); // write and wakeup
size_t buffer_size = 0;
while (f1.a.write("x", 1) == 1) {
++buffer_size;
}
EXPECT_TRUE((errno == EWOULDBLOCK) || (errno == EAGAIN));
fprintf(stderr, "buffer size: %zu\n", buffer_size);
TEST_BARRIER(); // #3
EXPECT_EQUAL(f2.wait_readable(), false); // wakeup only
} else {
TEST_BARRIER(); // #1
f2.wakeup();
TEST_BARRIER(); // #2
TEST_BARRIER(); // #3
std::this_thread::sleep_for(std::chrono::milliseconds(20));
f2.wakeup();
}
}
TEST_MAIN() { TEST_RUN_ALL(); }
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