API tools faq
paste
Advertisement
aircampro

crow mustache bbs webserver example

aircampro
Dec 16th, 2023 (edited)
873
0
Never
Add comment
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
C++ 9.00 KB | Software | 0 0
raw download clone embed print report
  1. //   example webserver in C++ using crow and mustache bbs message board and other methods are shown
  2. //
  3. //    config.json
  4. //    ========================
  5. //    "db_host": "localhost",
  6. //    "db_user": "mysqluser",
  7. //    "db_pass": "mysqlpass",
  8. //    "db_name": "bbs"
  9.  
  10. //    html mustache = bbs.html
  11. //    ========================
  12. //<!DOCTYPE html>
  13. //<html lang="en">
  14. //  <head>
  15. //    <meta charset="UTF-8">
  16. //    <title>This is the ACP BBS</title>
  17. //      <style type="text/css" media="screen, handheld, print, tv" >
  18. //      <!--
  19. //      .b3-2 h2, .b3-2 h3, .b3-2 p { border: solid; border-width: 2px 4px 4px 2px;
  20. //      padding: 5px; margin: 0px 0px 4px; }
  21. //      .b3-2 h2 { border-color: blue; border-style: dashed; }
  22. //      .b3-2 h3 { border-top-color: lightgreen; border-right-color: plum;
  23. //      border-bottom-color: plum; border-left-color: lightgreen; border-style: double; border-top-style: solid; border-width: thick }
  24. //      .b3-2 p { border-color: mediumpurple transparent;  }
  25. //      -->
  26. //      </style>
  27. //  </head>
  28. //  <body>
  29. //    <div class=b3-2>
  30. //    <h3>ACP Builitin Board</h3>
  31. //    <ul>
  32. //      {{# posts}}
  33. //      <li>{{id}}: {{text}}</li>
  34. //      {{/ posts}}
  35. //    </ul>
  36. //    <p>Type you're message here</p>
  37. //    <form action="/post" method="post">
  38. //      <input type="text" name="text"><input type="submit">
  39. //    </form>
  40. //  </div>
  41. //  </body>
  42. //</html>
  43. #include <iostream>
  44. #include <string>
  45.    
  46. #include <memory>
  47. #include <mysql_connection.h>
  48. #include <mysql_driver.h>
  49. #include <cppconn/prepared_statement.h>
  50. #include <cppconn/resultset.h>
  51. #include "crow_all.h"
  52. #include "crow.h"
  53. #include "cpplinq.hpp"
  54.  
  55. #include <boost/algorithm/string.hpp>
  56. #include <boost/lexical_cast.hpp>
  57. #include <boost/optional.hpp>
  58. #include <boost/optional/optional_io.hpp>
  59.  
  60. #include <chrono>
  61. #include "fmt/format.h"
  62. #include <fmt/chrono.h>
  63. #include <fmt/time.h>
  64.  
  65. struct date {
  66.     int y, m, d;
  67.  
  68.     date(int y, int m, int d)
  69.         : y(y), m(m), d(d)
  70.     {}
  71.  
  72.     std::ostream &operator<<(std::ostream &o, date const&rhs)
  73.     {
  74.         return o << rhs.y << '/' << rhs.m << '/' << rhs.d;
  75.     }
  76. };
  77.  
  78. int
  79. main() {
  80.   std::ifstream conf("config.json");
  81.   if (!conf) {
  82.     std::cerr << "config.json not found" << std::endl;
  83.     return 1;
  84.   }
  85.   std::string json = {
  86.     std::istreambuf_iterator<char>(conf),
  87.     std::istreambuf_iterator<char>()};
  88.   crow::json::rvalue config = crow::json::load(json);
  89.  
  90.   auto driver = sql::mysql::get_mysql_driver_instance();
  91.   auto raw_con = driver->connect(
  92.     (std::string) config["db_host"].s(),
  93.     (std::string) config["db_user"].s(),
  94.     (std::string) config["db_pass"].s());
  95.   auto con = std::unique_ptr<sql::Connection>(raw_con);
  96.   con->setSchema((std::string) config["db_name"].s());
  97.  
  98.   crow::SimpleApp app;
  99.   crow::mustache::set_base(".");
  100.  
  101.   // if you want to create it when you start this program uncomment this
  102.   //
  103.   // auto st = " CREATE TABLE bbs (
  104.   //            id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  105.   //            text VARCHAR(100),
  106.   //            created TIMESTAMP DEFAULT NOW()
  107.   //            ) ENGINE=InnoDB DEFAULT CHARSET=utf8;";
  108.   // auto stmt = std::unique_ptr<sql::PreparedStatement>(
  109.   //    con->prepareStatement(st));
  110.   // stmt->executeUpdate();          
  111.  
  112.   CROW_ROUTE(app, "/")
  113.   ([&]{
  114.     auto stmt = std::unique_ptr<sql::PreparedStatement>(
  115.       con->prepareStatement("select * from bbs order by created"));
  116.     auto res = std::unique_ptr<sql::ResultSet>(
  117.       stmt->executeQuery());
  118.     int n = 0;
  119.     crow::mustache::context ctx;
  120.     while (res->next()) {
  121.       ctx["posts"][n]["id"] = res->getInt("id");
  122.       ctx["posts"][n]["text"] = res->getString("text");
  123.       n++;
  124.     }
  125.     return crow::mustache::load("bbs.html").render(ctx);
  126.   });
  127.  
  128.   CROW_ROUTE(app, "/post")
  129.       .methods("POST"_method)
  130.   ([&](const crow::request& req, crow::response& res){
  131.     crow::query_string params(req.body);
  132.     auto stmt = std::unique_ptr<sql::PreparedStatement>(
  133.       con->prepareStatement("insert into bbs(text) values(?)"));
  134.     stmt->setString(1, params.get("text"));
  135.     stmt->executeUpdate();
  136.     res = crow::response(302);
  137.     res.set_header("Location", "/");
  138.     res.end();
  139.   });
  140.  
  141.   // simple json response get the config credentials
  142.   CROW_ROUTE(app, "/json_data")
  143.   ([&]{
  144.         crow::json::wvalue x;
  145.         x["db_pass"] = (std::string) config["db_pass"].s();
  146.         x["db_host"] = (std::string) config["db_host"].s();
  147.         x["db_name"] = (std::string) config["db_name"].s();
  148.         x["db_user"] = (std::string) config["db_user"].s();
  149.         return x;
  150.   });
  151.  
  152.   CROW_ROUTE(app, "/sumfun/<int>")
  153.   ([&] (int count){
  154.        using namespace cpplinq;
  155.        int ints[] = {3,1,4,1,5,10,12,9,2,6,5,4,12,66,99,20,21,65,67,76,34,75,18};
  156.  
  157.        // Computes the sum of all chosen numbers in the sequence above
  158.        auto x =
  159.             from_array(ints)
  160.         >>  where ([](int i) {return i % count == 0;})     // Keep only numbers with the modulus of the arguemnt passed
  161.         >>  sum ()                                         // Sum those numbers
  162.         ;
  163.         std::ostringstream os;
  164.         os << x << "You selected from our memory array! : ";
  165.         return crow::response(os.str());
  166.   });
  167.  
  168.   CROW_ROUTE(app, "/params")
  169.   ([&](const crow::request& req){
  170.           std::ostringstream os;
  171.           os << "Params: " << req.url_params << "\n\n";
  172.           os << "The key 'my_key' was " << (req.url_params.get("my_key") == nullptr ? "not " : "") << "found.\n";
  173.           if(req.url_params.get("get_this_double") != nullptr) {
  174.               double countD = boost::lexical_cast<double>(req.url_params.get("get_this_double"));
  175.               os << "The value of 'get_this_value' is " <<  countD << '\n';
  176.           }
  177.           auto count = req.url_params.get_list("value_list");
  178.           os << "The key 'count' contains " << count.size() << " value(s).\n";
  179.           for(const auto& countVal : count) {
  180.               os << " - " << countVal << '\n';
  181.           }
  182.           return crow::response{os.str()};
  183.    });
  184.  
  185.    //      * curl {ip}:40081/mul/4/7
  186.    CROW_ROUTE(app, "/mul/<int>/<int>")
  187.    ([&](const crow::request& req, crow::response& res, int a, int b){
  188.         std::ostringstream os;
  189.         os << a*b;
  190.         res.write(os.str());
  191.         res.end();
  192.    });
  193.  
  194.    //      * curl -d '{"add1":13,"add2":7}' {ip}:40081/add_json  
  195.    CROW_ROUTE(app, "/add_json")
  196.         .methods(crow::HTTPMethod::POST)
  197.    ([&](const crow::request& req){
  198.         auto x = crow::json::load(req.body);
  199.         if (!x)
  200.             return crow::response(400);
  201.         auto sum = x["add1"].i()+x["add2"].i();
  202.         std::ostringstream os;
  203.         os << sum;
  204.         return crow::response{os.str()};
  205.    });
  206.  
  207.    CROW_ROUTE(app, "/getLatLong")
  208.         .methods("GET"_method)
  209.    ([&](const crow::request& req){
  210.         crow::json::wvalue x;
  211.         auto params = req.url_params;
  212.         auto param_longitude = atof(params.get("longitude"));
  213.         auto param_latitude = atof(params.get("latitude"));
  214.         x["lat"] = param_latitude;
  215.         x["lon"] = param_longitude;
  216.         return x;
  217.    });
  218.  
  219.    //      * curl {ip}:40081/mustache_page
  220.    CROW_ROUTE(app, "/mustashe_page")
  221.    ([&]{
  222.         auto page = crow::mustache::load("mustache.html");
  223.         return page.render();
  224.    });
  225.    
  226.    //      * curl -d '{"year":2023,"month":7,"day":12}' {ip}:40081/date_json  
  227.    CROW_ROUTE(app, "/date_json")
  228.         .methods(crow::HTTPMethod::POST)
  229.    ([&](const crow::request& req){
  230.         auto x = crow::json::load(req.body);
  231.         if (!x)
  232.             return crow::response(400);
  233.         auto yr = x["year"].i();
  234.         auto mon = x["month"].i();
  235.         auto dy = x["day"].i();
  236.         std::string fmt_date = fmt::format("Date sent is {}", date{dy, mon, yr});
  237.         return crow::response{fmt_date};
  238.    });
  239.  
  240.    //      * curl {ip}:40081/date_time_server  
  241.    CROW_ROUTE(app, "/date_time_server")
  242.    ([&]{
  243.         std::ostringstream os;
  244.         auto sc_now = std::chrono::system_clock::now();
  245.         auto tm_now = std::chrono::system_clock::to_time_t(sc_now);
  246.         fmt::print("{:%Y-%m-%d}\n", *std::localtime(&tm_now));
  247.         os << "date : " << fmt::format("{:%Y-%m-%d}\n", *std::localtime(&tm_now));
  248.         auto tm_now2  = std::time(nullptr);
  249.         fmt::print("{:%H:%I:%S}\n", *std::localtime(&tm_now2));
  250.         os << " time : " << fmt::format("{:%H:%I:%S}\n", *std::localtime(&tm_now2));
  251.         return crow::response{os.str()};
  252.    });
  253.  
  254.    //      * curl -d '{"pad":123,"by":6'} {ip}:40081/pad_json  
  255.    CROW_ROUTE(app, "/pad_json")
  256.         .methods(crow::HTTPMethod::POST)
  257.    ([&](const crow::request& req){
  258.         auto x = crow::json::load(req.body);
  259.         if (!x)
  260.             return crow::response(400);
  261.         auto tag = x["pad"].i();
  262.         auto by_int = x["by"].i();
  263.         fmt::print("{:0{}d}\n", tag, by_int);
  264.         std::string fmt_tag = fmt::format("{:0{}d}\n", tag, by_int);
  265.         return crow::response{fmt_tag};
  266.    });
  267.    
  268.   app.port(40081)
  269.     //.multithreaded()
  270.     .run();
  271. }
Tags: #crow #mustache #json #bbs
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement
Public Pastes
Advertisement
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy.  OK, I Understand
Not a member of Pastebin yet?
Sign Up, it unlocks many cool features!