update, add upload/download example

examples/server/main.cpp

@@ -1,7 +1,7 @@
 #include <rpc_server.h>
 using namespace rest_rpc;
 using namespace rpc_service;
-
+#include <fstream>
 struct dummy{
 	int add(connection* conn, int a, int b) { return a + b; }
 };
@@ -34,6 +34,29 @@ person get_person(connection* conn) {
 	return { 1, "tom", 20 };
 }
 
+void upload(connection* conn, const std::string& filename, const std::string& content) {
+	std::cout << content.size() << std::endl;
+	std::ofstream file(filename, std::ios::binary);
+	file.write(content.data(), content.size());
+}
+
+std::string download(connection* conn, const std::string& filename) {
+	std::ifstream file(filename, std::ios::binary);
+	if (!file) {
+		return "";
+	}
+
+	file.seekg(0, std::ios::end);
+	size_t file_len = file.tellg();
+	file.seekg(0, std::ios::beg);
+	std::string content;
+	content.resize(file_len);
+	file.read(&content[0], file_len);
+	std::cout << file_len << std::endl;
+
+	return content;
+}
+
 int main() {
 	rpc_server server(9000, 4);
 
@@ -43,6 +66,8 @@ int main() {
 	server.register_handler("hello", hello);
 	server.register_handler("get_person_name", get_person_name);
 	server.register_handler("get_person", get_person);
+	server.register_handler("upload", upload);
+	server.register_handler("download", download);
 
 	server.run();