[4] Nginx Server Setup - Writing a Drogon Test API

Let's create an API using Drogon to return specific values as a test.

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1. Setting up the Drogon Test Project

- Run the following command in the directory where `drogon_ctl` is installed: ``` drogon_ctl create project testAPI cd testAPI ```

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2. Build

- The full path will be /root/drogon2/drogon/build/drogon_ctl/testAPI/build

``` mkdir build cd build cmake .. make ```

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If the following error occurs, it’s best to set the environment variable and reinstall Drogon:

``` CMake Error at /usr/share/cmake/Modules/CMakeFindDependencyMacro.cmake:76 (find_package): By not providing "FindJsoncpp.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "Jsoncpp", but CMake did not find one.

Could not find a package configuration file provided by "Jsoncpp" with any of the following names:

JsoncppConfig.cmake jsoncpp-config.cmake

Add the installation prefix of "Jsoncpp" to CMAKE_PREFIX_PATH or set "Jsoncpp_DIR" to a directory containing one of the above files. If "Jsoncpp" provides a separate development package or SDK, be sure it has been installed. Call Stack (most recent call first): /root/drogon/build/CMakeFiles/DrogonConfig.cmake:39 (find_dependency) CMakeLists.txt:31 (find_package) ```

This issue arises from a mismatch between the paths where Drogon and Jsoncpp are installed. To resolve this:

``` Make sure to specify the path where `jsoncpp` is located

export Jsoncpp_DIR=/usr/local/lib/cmake/jsoncpp Check the correct path using the following commands:

find / -name "jsoncpp-config.cmake" 2>/dev/null find / -name "JsoncppConfig.cmake" 2>/dev/null

Once identified, set the path and reinstall following the instructions at Framework Build Reference under Section 2. ```

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3. Creating the Controller

``` drogon_ctl create controller testAPIController

A controller will be created in the following path: [root@vbox controllers] (master) $ pwd /root/drogon2/drogon/build/drogon_ctl/testAPI/controllers ```

3-1. Source Code

``` testAPIController.cc

#include "testAPIController.h"

void testAPIController::handleRequest(const HttpRequestPtr& req, std::function&& callback) { auto resp = HttpResponse::newHttpResponse(); resp->setBody("Drogon Test API"); callback(resp); }

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testAPIController.h

#pragma once #include

using namespace drogon;

class testAPIController : public HttpController { public: METHOD_LIST_BEGIN // Handles GET requests to the root path ADD_METHOD_TO(testAPIController::handleRequest, "/myapi", Get); METHOD_LIST_END

void handleRequest(const HttpRequestPtr& req, std::function&& callback); }; ```

3-2. Configuration Changes

Edit `/root/drogon2/drogon/build/drogon_ctl/testAPI/config.json`. Use the following structure, modifying only the port to match the NGINX proxy port.

``` "listeners": [ { // address: Ip address, 0.0.0.0 by default "address": "0.0.0.0", // port: Port number "port": 8848, // https: If true, use https for security, false by default "https": false } ], ```

3-3. Modify main.cc

Modify to load the configuration file by editing /root/drogon2/drogon/build/drogon_ctl/testAPI/main.cc

``` #include int main() { // Set HTTP listener address and port // drogon::app().addListener("0.0.0.0", 5555); // Load config file drogon::app().loadConfigFile("../config.json");

// drogon::app().loadConfigFile("../config.yaml"); // Run HTTP framework, the method will block in the internal event loop drogon::app().run(); return 0; } ```

3-4. Rebuild

``` cd /root/drogon2/drogon/build/drogon_ctl/testAPI/build make

./testAPI # Run the application ```

4. Testing

Verify access via the web.

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Related Links

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Recommended Link

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