examples: add vanilla_http_server - a fast, multi-threaded, non-blocking, port and host reuse, thread-safe, epoll server (#23094)

examples/vanilla_http_server/src/controllers.v

@@ -0,0 +1,42 @@
+module main
+
+import strings
+
+const http_ok_response = 'HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: 0\r\nConnection: keep-alive\r\n\r\n'.bytes()
+
+const http_created_response = 'HTTP/1.1 201 Created\r\nContent-Type: application/json\r\nContent-Length: 0\r\nConnection: keep-alive\r\n\r\n'.bytes()
+
+fn home_controller(params []string) ![]u8 {
+	return http_ok_response
+}
+
+fn get_users_controller(params []string) ![]u8 {
+	return http_ok_response
+}
+
+@[direct_array_access; manualfree]
+fn get_user_controller(params []string) ![]u8 {
+	if params.len == 0 {
+		return tiny_bad_request_response
+	}
+	id := params[0]
+	response_body := id
+
+	mut sb := strings.new_builder(200)
+	sb.write_string('HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nContent-Length: ')
+	sb.write_string(response_body.len.str())
+	sb.write_string('\r\nConnection: keep-alive\r\n\r\n')
+	sb.write_string(response_body)
+
+	defer {
+		unsafe {
+			response_body.free()
+			params.free()
+		}
+	}
+	return sb
+}
+
+fn create_user_controller(params []string) ![]u8 {
+	return http_created_response
+}