Add HttpClient pool

Author: fantasy-peak

CMakeLists.txt

@@ -717,6 +717,7 @@ install(FILES ${NOSQL_HEADERS} DESTINATION ${INSTALL_INCLUDE_DIR}/drogon/nosql)
 
 set(DROGON_UTIL_HEADERS
     lib/inc/drogon/utils/coroutine.h
+    lib/inc/drogon/utils/HttpClientPool.h
     lib/inc/drogon/utils/FunctionTraits.h
     lib/inc/drogon/utils/HttpConstraint.h
     lib/inc/drogon/utils/OStringStream.h

examples/client_example/main.cc

@@ -1,43 +1,113 @@
 #include <drogon/drogon.h>
 
-#include <future>
+#include <chrono>
 #include <iostream>
+#include <memory>
+#include <thread>
+#include <drogon/HttpTypes.h>
+#include <drogon/utils/coroutine.h>
+#include <trantor/utils/Logger.h>
 
 #ifdef __linux__
 #include <sys/socket.h>
 #include <netinet/tcp.h>
 #endif
-
+#include <drogon/utils/HttpClientPool.h>
 using namespace drogon;
 
 int nth_resp = 0;
 
 int main()
 {
+    auto func = [](int fd) {
+        std::cout << "setSockOptCallback:" << fd << std::endl;
+#ifdef __linux__
+        int optval = 10;
+        ::setsockopt(fd,
+                     SOL_TCP,
+                     TCP_KEEPCNT,
+                     &optval,
+                     static_cast<socklen_t>(sizeof optval));
+        ::setsockopt(fd,
+                     SOL_TCP,
+                     TCP_KEEPIDLE,
+                     &optval,
+                     static_cast<socklen_t>(sizeof optval));
+        ::setsockopt(fd,
+                     SOL_TCP,
+                     TCP_KEEPINTVL,
+                     &optval,
+                     static_cast<socklen_t>(sizeof optval));
+#endif
+    };
     trantor::Logger::setLogLevel(trantor::Logger::kTrace);
+#ifdef __cpp_impl_coroutine
+    HttpClientPoolConfig cfg{
+        .hostString = "http://www.baidu.com",
+        .useOldTLS = false,
+        .validateCert = false,
+        .size = 10,
+        .setCallback =
+            [func](auto &client) {
+                LOG_INFO << "setCallback";
+                client->setSockOptCallback(func);
+            },
+        .numOfThreads = 4,
+        .keepaliveRequests = 1000,
+        .idleTimeout = std::chrono::seconds(10),
+        .maxLifeTime = std::chrono::seconds(300),
+        .checkInterval = std::chrono::seconds(10),
+    };
+    auto pool = std::make_unique<HttpClientPool>(cfg);
+    auto req = HttpRequest::newHttpRequest();
+    req->setMethod(drogon::Get);
+    req->setPath("/s");
+    req->setParameter("wd", "wx");
+    req->setParameter("oq", "wx");
+
+    for (int i = 0; i < 1; i++)
+    {
+        [](auto req, auto &pool) -> drogon::AsyncTask {
+            {
+                auto [result, resp] = co_await pool->sendRequestCoro(req, 10);
+                if (result == ReqResult::Ok)
+                    LOG_INFO << "1:" << resp->getStatusCode();
+            }
+            {
+                auto [result, resp] = co_await pool->sendRequestCoro(req, 10);
+                if (result == ReqResult::Ok)
+                    LOG_INFO << "2:" << resp->getStatusCode();
+            }
+            {
+                auto [result, resp] = co_await pool->sendRequestCoro(req, 10);
+                if (result == ReqResult::Ok)
+                    LOG_INFO << "3:" << resp->getStatusCode();
+            }
+            co_return;
+        }(req, pool);
+    }
+
+    for (int i = 0; i < 10; i++)
+    {
+        pool->sendRequest(
+            req,
+            [](ReqResult result, const HttpResponsePtr &response) {
+                if (result != ReqResult::Ok)
+                {
+                    LOG_ERROR
+                        << "error while sending request to server! result: "
+                        << result;
+                    return;
+                }
+                LOG_INFO << "callback:" << response->getStatusCode();
+            },
+            10);
+    }
+    std::this_thread::sleep_for(std::chrono::seconds(30));
+#else
     {
         auto client = HttpClient::newHttpClient("http://www.baidu.com");
-        client->setSockOptCallback([](int fd) {
-            std::cout << "setSockOptCallback:" << fd << std::endl;
-#ifdef __linux__
-            int optval = 10;
-            ::setsockopt(fd,
-                         SOL_TCP,
-                         TCP_KEEPCNT,
-                         &optval,
-                         static_cast<socklen_t>(sizeof optval));
-            ::setsockopt(fd,
-                         SOL_TCP,
-                         TCP_KEEPIDLE,
-                         &optval,
-                         static_cast<socklen_t>(sizeof optval));
-            ::setsockopt(fd,
-                         SOL_TCP,
-                         TCP_KEEPINTVL,
-                         &optval,
-                         static_cast<socklen_t>(sizeof optval));
-#endif
-        });
+        client->setSockOptCallback(func);
 
         auto req = HttpRequest::newHttpRequest();
         req->setMethod(drogon::Get);
@@ -77,4 +147,5 @@ int main()
     }
 
     app().run();
+#endif
 }