first couple of requests

CMakeLists.txt

@@ -9,6 +9,7 @@ cmake_policy(SET CMP0076 NEW)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+find_package(nlohmann_json REQUIRED)
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(FCGI fcgi)
 
@@ -20,9 +21,10 @@ add_subdirectory(request)
 add_subdirectory(response)
 add_subdirectory(stream)
 
-target_link_libraries(pica
+target_link_libraries(pica PRIVATE
     fcgi
     fcgi++
+    nlohmann_json::nlohmann_json
 )
 
 install(TARGETS pica RUNTIME DESTINATION bin)

main.cpp

@@ -15,7 +15,7 @@ int main() {
         return 1;
     }
 
-    if (chmod(socketPath, 0770) != 0) {
+    if (chmod(socketPath, 0777) != 0) {
         std::cerr << "Couldn't set socket permissions" << std::endl;
         return 2;
     }

request/request.cpp

@@ -63,16 +63,23 @@ OStream Request::getErrorStream() {
     return OStream(raw.err);
 }
 
-std::string_view Request::getPath(const std::string& serverName) const {
+std::string Request::getPath(const std::string& serverName) const {
     if (state != State::accepted)
         throw std::runtime_error("An attempt to request path on a wrong request state");
 
-    std::string_view path;
+    std::string path;
     std::string_view scriptFileName(FCGX_GetParam(SCRIPT_FILENAME, raw.envp));
     std::string::size_type snLocation = scriptFileName.find(serverName);
+
     if (snLocation != std::string::npos) {
         if (snLocation + serverName.size() < scriptFileName.size())
             path = scriptFileName.substr(snLocation + serverName.size() + 1);
+
+    }
+
+    if (!path.empty()) {
+        while (path.back() == '/')
+            path.erase(path.end() - 1);
     }
 
     return path;
@@ -88,6 +95,19 @@ std::string Request::getServerName() const {
 void Request::printEnvironment(std::ostream& out) {
     char **envp = raw.envp;
     for (int i = 0; envp[i] != nullptr; ++i) {
-        out << envp[i] << "</br>";
+        out << envp[i] << "\n";
+    }
+}
+
+void Request::printEnvironment(nlohmann::json& out) {
+    if (!out.is_object())
+        return;
+
+    char **envp = raw.envp;
+    for (int i = 0; envp[i] != nullptr; ++i) {
+        std::string_view value(envp[i]);
+        std::string::size_type pos = value.find('=');
+        if (pos != std::string::npos)
+            out[std::string(value.substr(0, pos))] = std::string(value.substr(pos + 1, value.size()));
     }
 }

request/request.h

@@ -6,6 +6,8 @@
 
 #include <fcgiapp.h>
 
+#include <nlohmann/json.hpp>
+
 #include "stream/ostream.h"
 
 class Request {
@@ -30,9 +32,10 @@ public:
     OStream getOutputStream();
     OStream getErrorStream();
 
-    std::string_view getPath(const std::string& serverName) const;
+    std::string getPath(const std::string& serverName) const;
     std::string getServerName() const;
     void printEnvironment(std::ostream& out);
+    void printEnvironment(nlohmann::json& out);
 
 private:
     State state;

response/response.cpp

@@ -8,7 +8,8 @@ constexpr std::array<std::string_view, static_cast<uint8_t>(Response::Status::__
 };
 
 constexpr std::array<std::string_view, static_cast<uint8_t>(Response::ContentType::__size)> contentTypes = {
-    "Content-type: text/html"
+    "Content-type: text/plain",
+    "Content-type: application/json"
 };
 
 Response::Response():
@@ -38,5 +39,11 @@ void Response::replyTo(Request& request) const {
 }
 
 void Response::setBody(const std::string& body) {
+    type = ContentType::text;
     Response::body = body;
 }
+
+void Response::setBody(const nlohmann::json& body) {
+    type = ContentType::json;
+    Response::body = body.dump();
+}

response/response.h

@@ -4,6 +4,8 @@
 #include <array>
 #include <string_view>
 
+#include <nlohmann/json.hpp>
+
 #include "request/request.h"
 #include "stream/ostream.h"
 
@@ -19,6 +21,7 @@ public:
 
     enum class ContentType {
         text,
+        json,
         __size
     };
     Response();
@@ -26,6 +29,7 @@ public:
 
     void replyTo(Request& request) const;
     void setBody(const std::string& body);
+    void setBody(const nlohmann::json& body);
 
 private:
     Status status;

server/CMakeLists.txt

@@ -1,9 +1,11 @@
 set(HEADERS
     server.h
+    router.h
 )
 
 set(SOURCES
     server.cpp
+    router.cpp
 )
 
 target_sources(pica PRIVATE ${SOURCES})

server/router.cpp

@@ -0,0 +1,41 @@
+#include "router.h"
+
+Router::Router():
+    table()
+{
+
+}
+
+void Router::addRoute(const std::string& path, const Handler& handler) {
+    auto result = table.emplace(path, handler);
+    if (!result.second)
+        std::cerr << "could'not add route " + path + " to the routing table";
+}
+
+void Router::route(const std::string& path, std::unique_ptr<Request> request) {
+    auto itr = table.find(path);
+    if (itr == table.end())
+        return handleNotFound(path, std::move(request));
+
+    try {
+        bool result = itr->second(request.get());
+        if (!result)
+            handleInternalError(std::runtime_error("handler failed to handle the request"), std::move(request));
+    } catch (const std::exception& e) {
+        handleInternalError(e, std::move(request));
+    }
+}
+
+void Router::handleNotFound(const std::string& path, std::unique_ptr<Request> request) {
+    Response notFound(Response::Status::notFound);
+    notFound.setBody(std::string("Path \"") + path + "\" was not found");
+    notFound.replyTo(*request.get());
+    std::cerr << "Not found: " << path << std::endl;
+}
+
+void Router::handleInternalError(const std::exception& exception, std::unique_ptr<Request> request) {
+    Response error(Response::Status::internalError);
+    error.setBody(std::string(exception.what()));
+    error.replyTo(*request.get());
+    std::cerr << "Internal error: " << exception.what() << std::endl;
+}

server/router.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <map>
+#include <functional>
+#include <string>
+#include <memory>
+
+#include "request/request.h"
+#include "response/response.h"
+
+class Router {
+public:
+    using Handler = std::function<bool(Request*)>;
+
+    Router();
+
+    void addRoute(const std::string& path, const Handler& handler);
+    void route(const std::string& path, std::unique_ptr<Request> request);
+
+private:
+    void handleNotFound(const std::string& path, std::unique_ptr<Request> request);
+    void handleInternalError(const std::exception& exception, std::unique_ptr<Request> request);
+
+private:
+    std::map<std::string, Handler> table;
+
+};

server/server.cpp

@@ -8,14 +8,15 @@ constexpr static const char* DOCUMENT_ROOT("DOCUMENT_ROOT");
 constexpr static const char* SCRIPT_NAME("SCRIPT_NAME");
 constexpr static const char* SCRIPT_FILENAME("SCRIPT_FILENAME");
 
-constexpr std::string_view info("info");
-constexpr std::string_view env("env");
-
 Server::Server():
     terminating(false),
     requestCount(0),
-    serverName(std::nullopt)
-{}
+    serverName(std::nullopt),
+    router()
+{
+    router.addRoute("info", Server::info);
+    router.addRoute("env", Server::printEnvironment);
+}
 
 Server::~Server() {}
 
@@ -52,27 +53,34 @@ void Server::handleRequest(std::unique_ptr<Request> request) {
     }
 
     try {
-        std::string_view sPath = request->getPath(serverName.value());
-
-        if (sPath == info) {
-            Response res;
-            res.setBody("Pica<br>\nVersion: 1.0.0<br>\nRequestsHandled: " + std::to_string(requestCount));
-            res.replyTo(*request.get());
-        } else if (sPath == env) {
-            std::ostringstream ss;
-            request->printEnvironment(ss);
-            Response res;
-            res.setBody(ss.str());
-            res.replyTo(*request.get());
-        } else {
-            Response notFound(Response::Status::notFound);
-            notFound.setBody(std::string("Path ") + sPath.data() + " was not found");
-            notFound.replyTo(*request.get());
-            std::cerr << "Not found: " << sPath.data() << std::endl;
-        }
+        std::string path = request->getPath(serverName.value());
+        router.route(path.data(), std::move(request));
     } catch (const std::exception e) {
         Response error(Response::Status::internalError);
-        error.setBody(e.what());
+        error.setBody(std::string(e.what()));
         error.replyTo(*request.get());
     }
 }
+
+bool Server::printEnvironment(Request* request) {
+    nlohmann::json body = nlohmann::json::object();
+    request->printEnvironment(body);
+
+    Response res;
+    res.setBody(body);
+    res.replyTo(*request);
+
+    return true;
+}
+
+bool Server::info(Request* request) {
+    Response res;
+    nlohmann::json body = nlohmann::json::object();
+    body["type"] = "Pica";
+    body["version"] = "0.0.1";
+
+    res.setBody(body);
+    res.replyTo(*request);
+
+    return true;
+}

server/server.h

@@ -12,8 +12,11 @@
 #include <fcgio.h>
 #include <stdint.h>
 
+#include <nlohmann/json.hpp>
+
 #include "request/request.h"
 #include "response/response.h"
+#include "router.h"
 
 class Server {
 public:
@@ -24,12 +27,13 @@ public:
 
 private:
     void handleRequest(std::unique_ptr<Request> request);
-    void router(const std::vector<std::string_view>& path);
-    void printEnv(std::ostream& out, FCGX_Request& request);
-    std::string_view getPath(const FCGX_Request& request);
+
+    static bool info(Request* request);
+    static bool printEnvironment(Request* request);
 
 private:
     bool terminating;
     uint64_t requestCount;
     std::optional<std::string> serverName;
+    Router router;
 };