Implemented body caching and cleanups to FileCache.

core/application.cpp

@@ -38,7 +38,7 @@ void Application::handle_request(Request *request) {
 
 	std::string path = request->http_parser->getPath();
 
-	if (FileCache::get_instance()->has_file(path)) {
+	if (FileCache::get_singleton()->wwwroot_has_file(path)) {
 		send_file(path, request);
 
 		return;
@@ -92,7 +92,7 @@ void Application::send_error(int error_code, Request *request) {
 }
 
 void Application::send_file(const std::string &path, Request *request) {
-	std::string fp = FileCache::get_instance()->wwwroot + path;
+	std::string fp = FileCache::get_singleton()->wwwroot + path;
 	
 	FILE *f = fopen(fp.c_str(), "rb");
 

core/file_cache.cpp

@@ -4,25 +4,25 @@
 
 #include <iostream>
 
-void FileCache::register_file(const std::string &file_path) {
+void FileCache::wwwroot_register_file(const std::string &file_path) {
 	registered_files.insert(file_path);
 }
 
-void FileCache::deregister_file(const std::string &file_path) {
+void FileCache::wwwroot_deregister_file(const std::string &file_path) {
 	registered_files.erase(file_path);
 }
 
-bool FileCache::has_file(const std::string &file_path) {
+bool FileCache::wwwroot_has_file(const std::string &file_path) {
 	return registered_files.find(file_path) != registered_files.end();
 }
 
-void FileCache::refresh() {
+void FileCache::wwwroot_refresh_cache() {
 	registered_files.clear();
 
-	evaluate_dir(wwwroot.c_str());
+	wwwroot_evaluate_dir(wwwroot.c_str());
 }
 
-void FileCache::evaluate_dir(const char *path) {
+void FileCache::wwwroot_evaluate_dir(const char *path) {
 	tinydir_dir dir;
 	if (tinydir_open(&dir, path) == -1) {
 		printf("Error opening wwwroot!\n");
@@ -47,7 +47,7 @@ void FileCache::evaluate_dir(const char *path) {
 				continue;
 			}
 
-			evaluate_dir(file.path);
+			wwwroot_evaluate_dir(file.path);
 		}
 
 		tinydir_next(&dir);
@@ -56,17 +56,68 @@ void FileCache::evaluate_dir(const char *path) {
 	tinydir_close(&dir);
 }
 
-FileCache::FileCache() {
-	_instance = this;
+bool FileCache::get_cached_body(const std::string &path, std::string *body) {
+	//TODO ERROR MACRO body == null
+
+	//this shouldn't need mutexes
+
+	CacheEntry *e = cache_map[path];
+
+	if (!e) {
+		return false;
+	}
+
+	int64_t current_timestamp = std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch()).count();
+
+	int64_t diff = current_timestamp - e->timestamp;
+
+	if (diff > cache_invalidation_time) {
+		return false;
+	}
+
+	body->append(e->body);
+
+	return true;
+}
+
+void FileCache::set_cached_body(const std::string &path, const std::string &body) {
+	cache_mutex.lock();
+
+	CacheEntry *e = cache_map[path];
+
+	if (!e) {
+		e = new CacheEntry();
+		cache_map[path] = e;
+	}
+
+	int64_t current_timestamp = std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch()).count();
+
+	e->timestamp = current_timestamp;
+	e->body = body;
+
+	cache_mutex.unlock();
+}
+
+FileCache::FileCache(bool singleton) {
+	if (singleton) {
+		if (_instance) {
+			printf("FileCache: Filecache instance is set as singleton, but an another FileCache instance is already set up as singleton! Ignoring setting!\n");
+		} else {
+			_instance = this;
+		}
+	}
+
+	cache_invalidation_time = 1;
 }
 
 FileCache::~FileCache() {
 	registered_files.clear();
 
-	_instance = nullptr;
+	if (_instance == this)
+		_instance = nullptr;
 }
 
-FileCache *FileCache::get_instance() {
+FileCache *FileCache::get_singleton() {
 	return _instance;
 }
 

core/file_cache.h

@@ -3,28 +3,48 @@
 
 #include <string>
 #include <set>
+#include <map>
+#include <chrono>
+#include <mutex>
 
 class FileCache {
 public:
     std::string wwwroot;
+    int cache_invalidation_time;
 
     //Note: file path should be the url you want to access the file with, inculding lead slash
     //e.g. http://127.0.0.1/a/b/d.jpg -> /a/b/d.jpg
-    void register_file(const std::string &file_path);
-    void deregister_file(const std::string &file_path);
+    void wwwroot_register_file(const std::string &file_path);
+    void wwwroot_deregister_file(const std::string &file_path);
+    bool wwwroot_has_file(const std::string &file_path);
+    void wwwroot_refresh_cache();
+    void wwwroot_evaluate_dir(const char *path);
 
-    bool has_file(const std::string &file_path);
+    bool get_cached_body(const std::string &path, std::string *body);
+    void set_cached_body(const std::string &path, const std::string &body);
 
-    void refresh();
-    void evaluate_dir(const char *path);
-
-    FileCache();
+    FileCache(bool singleton = false);
     virtual ~FileCache();
 
-    static FileCache *get_instance();
+    static FileCache *get_singleton();
 
     std::set<std::string> registered_files;
 
+protected:
+
+    struct CacheEntry {
+        int64_t timestamp;
+        std::string body;
+
+        CacheEntry() {
+            timestamp = 0;
+        }
+    };
+
+    std::mutex cache_mutex;
+
+    std::map<std::string, CacheEntry *> cache_map;
+
 private:
     static FileCache *_instance;
 };

main.cpp

@@ -10,9 +10,9 @@
 #define MAIN_CLASS RDNApplication
 
 int main(int argc, char **argv) {
-    FileCache *file_cache = new FileCache();
+    FileCache *file_cache = new FileCache(true);
     file_cache->wwwroot = "./www";
-    file_cache->refresh();
+    file_cache->wwwroot_refresh_cache();
 
     Application *app = new MAIN_CLASS();
 

rdn_application.cpp

@@ -4,16 +4,28 @@
 
 #include <iostream>
 
-void RDNApplication::index(Request *request) {
-	//std::string body = "<html>hello world aaaaa </html>";
+#include "core/file_cache.h"
 
-    std::string body = "<html><script>var blocked = false; document.addEventListener(\"visibilitychange\", function() { if (!blocked && document.hidden) {blocked = true;alert('Blocked once');}});</script></html>";
+void RDNApplication::index(Request *request) {
+	std::string body;
+
+	if (FileCache::get_singleton()->get_cached_body("index", &body)) {
+		std::string body = "<html>hello world aaaaa </html>";
+
+		request->response->setBody(body);
+
+        return;
+	}
+
+	body = "<html>hello world aaaaa </html>";
+
+    FileCache::get_singleton()->set_cached_body("index", body);
 
 	request->response->setBody(body);
 }
 
 void RDNApplication::session_middleware_func(Request *request) {
-    std::cout << "dddd" << std::endl;
+	std::cout << "dddd" << std::endl;
 }
 
 void RDNApplication::setup_routes() {