/*
- * Copyright 2015 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* limitations under the License.
*/
-#include <folly/io/async/EventHandler.h>
-
-#include <sys/eventfd.h>
+#include <bitset>
+#include <future>
#include <thread>
+
#include <folly/MPMCQueue.h>
#include <folly/ScopeGuard.h>
#include <folly/io/async/EventBase.h>
-
-#include <gtest/gtest.h>
-#include <gmock/gmock.h>
+#include <folly/io/async/EventHandler.h>
+#include <folly/portability/GMock.h>
+#include <folly/portability/GTest.h>
+#include <folly/portability/Sockets.h>
+#include <sys/eventfd.h>
using namespace std;
using namespace folly;
EXPECT_EQ(0, writesRemaining);
EXPECT_EQ(0, readsRemaining);
}
+
+#ifdef EV_PRI
+//
+// See rfc6093 for extensive discussion on TCP URG semantics. Specificaly,
+// it points out that URG mechanism was never intended to be used
+// for out-of-band information delivery. However, pretty much every
+// implementation interprets the LAST octect or urgent data as the
+// OOB byte.
+//
+class EventHandlerOobTest : public ::testing::Test {
+ public:
+ //
+ // Wait for port number to connect to, then connect and invoke
+ // clientOps(fd) where fd is the connection file descriptor
+ //
+ void runClient(std::function<void(int fd)> clientOps) {
+ clientThread = std::thread(
+ [ serverPortFuture = serverReady.get_future(), clientOps ]() mutable {
+ int clientFd = socket(AF_INET, SOCK_STREAM, 0);
+ SCOPE_EXIT {
+ close(clientFd);
+ };
+ struct hostent* he{nullptr};
+ struct sockaddr_in server;
+
+ std::array<const char, 10> hostname = {"localhost"};
+ he = gethostbyname(hostname.data());
+ PCHECK(he);
+
+ memcpy(&server.sin_addr, he->h_addr_list[0], he->h_length);
+ server.sin_family = AF_INET;
+
+ // block here until port is known
+ server.sin_port = serverPortFuture.get();
+ LOG(INFO) << "Server is ready";
+
+ PCHECK(
+ ::connect(clientFd, (struct sockaddr*)&server, sizeof(server)) ==
+ 0);
+ LOG(INFO) << "Server connection available";
+
+ clientOps(clientFd);
+ });
+ }
+
+ //
+ // Bind, get port number, pass it to client, listen/accept and store the
+ // accepted fd
+ //
+ void acceptConn() {
+ // make the server.
+ int listenfd = socket(AF_INET, SOCK_STREAM, 0);
+ SCOPE_EXIT {
+ close(listenfd);
+ };
+ PCHECK(listenfd != -1) << "unable to open socket";
+
+ struct sockaddr_in sin;
+ sin.sin_port = htons(0);
+ sin.sin_addr.s_addr = INADDR_ANY;
+ sin.sin_family = AF_INET;
+
+ PCHECK(bind(listenfd, (struct sockaddr*)&sin, sizeof(sin)) >= 0)
+ << "Can't bind to port";
+ listen(listenfd, 5);
+
+ struct sockaddr_in findSockName;
+ socklen_t sz = sizeof(findSockName);
+ getsockname(listenfd, (struct sockaddr*)&findSockName, &sz);
+ serverReady.set_value(findSockName.sin_port);
+
+ struct sockaddr_in cli_addr;
+ socklen_t clilen = sizeof(cli_addr);
+ serverFd = accept(listenfd, (struct sockaddr*)&cli_addr, &clilen);
+ PCHECK(serverFd >= 0) << "can't accept";
+ }
+
+ void SetUp() override {}
+
+ void TearDown() override {
+ clientThread.join();
+ close(serverFd);
+ }
+
+ EventBase eb;
+ std::thread clientThread;
+ std::promise<decltype(sockaddr_in::sin_port)> serverReady;
+ int serverFd{-1};
+};
+
+//
+// Test that sending OOB data is detected by event handler
+//
+TEST_F(EventHandlerOobTest, EPOLLPRI) {
+ auto clientOps = [](int fd) {
+ char buffer[] = "banana";
+ int n = send(fd, buffer, strlen(buffer) + 1, MSG_OOB);
+ LOG(INFO) << "Client send finished";
+ PCHECK(n > 0);
+ };
+
+ runClient(clientOps);
+ acceptConn();
+
+ struct SockEvent : public EventHandler {
+ SockEvent(EventBase* eb, int fd) : EventHandler(eb, fd), fd_(fd) {}
+
+ void handlerReady(uint16_t events) noexcept override {
+ EXPECT_TRUE(EventHandler::EventFlags::PRI & events);
+ std::array<char, 255> buffer;
+ int n = read(fd_, buffer.data(), buffer.size());
+ //
+ // NB: we sent 7 bytes, but only received 6. The last byte
+ // has been stored in the OOB buffer.
+ //
+ EXPECT_EQ(6, n);
+ EXPECT_EQ("banana", std::string(buffer.data(), 6));
+ // now read the byte stored in OOB buffer
+ n = recv(fd_, buffer.data(), buffer.size(), MSG_OOB);
+ EXPECT_EQ(1, n);
+ }
+
+ private:
+ int fd_;
+ } sockHandler(&eb, serverFd);
+
+ sockHandler.registerHandler(EventHandler::EventFlags::PRI);
+ LOG(INFO) << "Registered Handler";
+ eb.loop();
+}
+
+//
+// Test if we can send an OOB byte and then normal data
+//
+TEST_F(EventHandlerOobTest, OOB_AND_NORMAL_DATA) {
+ auto clientOps = [](int sockfd) {
+ {
+ // OOB buffer can only hold one byte in most implementations
+ std::array<char, 2> buffer = {"X"};
+ int n = send(sockfd, buffer.data(), 1, MSG_OOB);
+ PCHECK(n > 0);
+ }
+
+ {
+ std::array<char, 7> buffer = {"banana"};
+ int n = send(sockfd, buffer.data(), buffer.size(), 0);
+ PCHECK(n > 0);
+ }
+ };
+
+ runClient(clientOps);
+ acceptConn();
+
+ struct SockEvent : public EventHandler {
+ SockEvent(EventBase* eb, int fd) : EventHandler(eb, fd), eb_(eb), fd_(fd) {}
+
+ void handlerReady(uint16_t events) noexcept override {
+ std::array<char, 255> buffer;
+ if (events & EventHandler::EventFlags::PRI) {
+ int n = recv(fd_, buffer.data(), buffer.size(), MSG_OOB);
+ EXPECT_EQ(1, n);
+ EXPECT_EQ("X", std::string(buffer.data(), 1));
+ registerHandler(EventHandler::EventFlags::READ);
+ return;
+ }
+
+ if (events & EventHandler::EventFlags::READ) {
+ int n = recv(fd_, buffer.data(), buffer.size(), 0);
+ EXPECT_EQ(7, n);
+ EXPECT_EQ("banana", std::string(buffer.data()));
+ eb_->terminateLoopSoon();
+ return;
+ }
+ }
+
+ private:
+ EventBase* eb_;
+ int fd_;
+ } sockHandler(&eb, serverFd);
+ sockHandler.registerHandler(
+ EventHandler::EventFlags::PRI | EventHandler::EventFlags::READ);
+ LOG(INFO) << "Registered Handler";
+ eb.loopForever();
+}
+
+//
+// Demonstrate that "regular" reads ignore the OOB byte sent to us
+//
+TEST_F(EventHandlerOobTest, SWALLOW_OOB) {
+ auto clientOps = [](int sockfd) {
+ {
+ std::array<char, 2> buffer = {"X"};
+ int n = send(sockfd, buffer.data(), 1, MSG_OOB);
+ PCHECK(n > 0);
+ }
+
+ {
+ std::array<char, 7> buffer = {"banana"};
+ int n = send(sockfd, buffer.data(), buffer.size(), 0);
+ PCHECK(n > 0);
+ }
+ };
+
+ runClient(clientOps);
+ acceptConn();
+
+ struct SockEvent : public EventHandler {
+ SockEvent(EventBase* eb, int fd) : EventHandler(eb, fd), fd_(fd) {}
+
+ void handlerReady(uint16_t events) noexcept override {
+ std::array<char, 255> buffer;
+ ASSERT_TRUE(events & EventHandler::EventFlags::READ);
+ int n = recv(fd_, buffer.data(), buffer.size(), 0);
+ EXPECT_EQ(7, n);
+ EXPECT_EQ("banana", std::string(buffer.data()));
+ }
+
+ private:
+ int fd_;
+ } sockHandler(&eb, serverFd);
+ sockHandler.registerHandler(EventHandler::EventFlags::READ);
+ LOG(INFO) << "Registered Handler";
+ eb.loop();
+}
+#endif
projects / folly.git / blobdiff