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1 files changed, 173 insertions, 0 deletions

diff --git a/lib/crow/examples/example.cpp b/lib/crow/examples/example.cpp
new file mode 100644
index 0000000..1355b03
--- /dev/null
+++ b/lib/crow/examples/example.cpp
@@ -0,0 +1,173 @@
+#include "crow.h"
+
+#include <sstream>
+
+class ExampleLogHandler : public crow::ILogHandler {
+    public:
+        void log(std::string /*message*/, crow::LogLevel /*level*/) override {
+//            cerr << "ExampleLogHandler -> " << message;
+        }
+};
+
+struct ExampleMiddleware 
+{
+    std::string message;
+
+    ExampleMiddleware() 
+    {
+        message = "foo";
+    }
+
+    void setMessage(std::string newMsg)
+    {
+        message = newMsg;
+    }
+
+    struct context
+    {
+    };
+
+    void before_handle(crow::request& /*req*/, crow::response& /*res*/, context& /*ctx*/)
+    {
+        CROW_LOG_DEBUG << " - MESSAGE: " << message;
+    }
+
+    void after_handle(crow::request& /*req*/, crow::response& /*res*/, context& /*ctx*/)
+    {
+        // no-op
+    }
+};
+
+int main()
+{
+    crow::App<ExampleMiddleware> app;
+
+    app.get_middleware<ExampleMiddleware>().setMessage("hello");
+
+    CROW_ROUTE(app, "/")
+        .name("hello")
+    ([]{
+        return "Hello World!";
+    });
+
+    CROW_ROUTE(app, "/about")
+    ([](){
+        return "About Crow example.";
+    });
+
+    // a request to /path should be forwarded to /path/
+    CROW_ROUTE(app, "/path/")
+    ([](){
+        return "Trailing slash test case..";
+    });
+
+
+    // simple json response
+    // To see it in action enter {ip}:18080/json
+    CROW_ROUTE(app, "/json")
+    ([]{
+        crow::json::wvalue x;
+        x["message"] = "Hello, World!";
+        return x;
+    });
+
+    // To see it in action enter {ip}:18080/hello/{integer_between -2^32 and 100} and you should receive
+    // {integer_between -2^31 and 100} bottles of beer!
+    CROW_ROUTE(app,"/hello/<int>")
+    ([](int count){
+        if (count > 100)
+            return crow::response(400);
+        std::ostringstream os;
+        os << count << " bottles of beer!";
+        return crow::response(os.str());
+    });
+
+    // To see it in action submit {ip}:18080/add/1/2 and you should receive 3 (exciting, isn't it)
+    CROW_ROUTE(app,"/add/<int>/<int>")
+    ([](const crow::request& /*req*/, crow::response& res, int a, int b){
+        std::ostringstream os;
+        os << a+b;
+        res.write(os.str());
+        res.end();
+    });
+
+    // Compile error with message "Handler type is mismatched with URL paramters"
+    //CROW_ROUTE(app,"/another/<int>")
+    //([](int a, int b){
+        //return crow::response(500);
+    //});
+
+    // more json example
+
+    // To see it in action, I recommend to use the Postman Chrome extension:
+    //      * Set the address to {ip}:18080/add_json
+    //      * Set the method to post
+    //      * Select 'raw' and then JSON
+    //      * Add {"a": 1, "b": 1}
+    //      * Send and you should receive 2
+
+    // A simpler way for json example:
+    //      * curl -d '{"a":1,"b":2}' {ip}:18080/add_json
+    CROW_ROUTE(app, "/add_json")
+        .methods("POST"_method)
+    ([](const crow::request& req){
+        auto x = crow::json::load(req.body);
+        if (!x)
+            return crow::response(400);
+        int sum = x["a"].i()+x["b"].i();
+        std::ostringstream os;
+        os << sum;
+        return crow::response{os.str()};
+    });
+
+    // Example of a request taking URL parameters
+    // If you want to activate all the functions just query
+    // {ip}:18080/params?foo='blabla'&pew=32&count[]=a&count[]=b
+    CROW_ROUTE(app, "/params")
+    ([](const crow::request& req){
+        std::ostringstream os;
+
+        // To get a simple string from the url params
+        // To see it in action /params?foo='blabla'
+        os << "Params: " << req.url_params << "\n\n"; 
+        os << "The key 'foo' was " << (req.url_params.get("foo") == nullptr ? "not " : "") << "found.\n";
+
+        // To get a double from the request
+        // To see in action submit something like '/params?pew=42'
+        if(req.url_params.get("pew") != nullptr) {
+            double countD = boost::lexical_cast<double>(req.url_params.get("pew"));
+            os << "The value of 'pew' is " <<  countD << '\n';
+        }
+
+        // To get a list from the request
+        // You have to submit something like '/params?count[]=a&count[]=b' to have a list with two values (a and b)
+        auto count = req.url_params.get_list("count");
+        os << "The key 'count' contains " << count.size() << " value(s).\n";
+        for(const auto& countVal : count) {
+            os << " - " << countVal << '\n';
+        }
+
+        // To get a dictionary from the request
+        // You have to submit something like '/params?mydict[a]=b&mydict[abcd]=42' to have a list of pairs ((a, b) and (abcd, 42))
+        auto mydict = req.url_params.get_dict("mydict");
+        os << "The key 'dict' contains " << mydict.size() << " value(s).\n";
+        for(const auto& mydictVal : mydict) {
+            os << " - " << mydictVal.first << " -> " << mydictVal.second << '\n';
+        }
+
+        return crow::response{os.str()};
+    });    
+
+    CROW_ROUTE(app, "/large")
+    ([]{
+        return std::string(512*1024, ' ');
+    });
+
+    // enables all log
+    app.loglevel(crow::LogLevel::DEBUG);
+    //crow::logger::setHandler(std::make_shared<ExampleLogHandler>());
+
+    app.port(18080)
+        .multithreaded()
+        .run();
+}