sltn011/advcpp-hw

Технопарк ДЗ Углублённый С++ / Mail.ru Technopark Advanced C++ Courses Homework

AdvCpp Mail.ru Courses Homework, Spring 2020

Repository contains homework projects from Mail.ru Advanced C++ Technopark courses from spring 2020.
Most of the projects are made for OS Linux.
Each project provides static libraries you can compile and use in your own code.

Description of each project provided below. Compilation instruction is provided below.
Every project has an example/ folder with showcase of how each part works

hw1-Process

Class HW::Process - wrapper for syscalls fork and exec for executing files
Class provides IPC with child process using two pipes. Read and write ends of pipes for child are stdin and stdout
Class guarantees Exception safety and uses RAII idiom
Class is made for use on OS Linux

hw2-Logger

Class HW::Logger for logging into stdout, stderr or in file
Logger provides logging levels in enum HW::Level
Each level output can be formatted using predefined constants in HW::Format::Color and HW::Format::LogFormat class
Class Logger uses Singleton pattern

hw3-Basic_TCP_Server

Simple classes HW::Socket, HW::Connection and HW::Server for establishing internet connection and data transmission using TCP protocol
Sockets used in classes are blocking
Classes guarantee Exception safety and uses RAII idiom
Classes are made for use on OS Linux

hw4-Async_TCP_Server

Classes HW::SocketAsync, HW::ConnectionAsync и HW::ServerAsync for establishing internet connection and data transmission using TCP protocol
Sockets used in classes are non-blocking. ServerAsync uses epoll
Classes guarantee Exception safety and uses RAII idiom
Classes are made for use on OS Linux

hw5-Shared_Memory_IPC

Class HW::shmem::SharedMemory provides IPC by creating shared memory block using mmap
Class HW::shmem::Map is a sorted associative container that creates SharedMemory and places std::map in it
Map can be used with primitive types and std::string. Map can be used by forked processes
Operations with map are protected with semaphore
Map puts its entries into shared memory using custom linear allocator
Classes guarantee Exception safety and uses RAII idiom
Classes are made for use on OS Linux

hw6-HTTP_Server_Framework

Framework provides classes HW::HTTP::HTTPRequest, HW::HTTP::HTTPResponse and HW::HTTP::BaseHTTPServer class that can be used for quickly setting up HTTP server
Server uses non-blocking connections and works on multithreaded epoll. Server is protected from thundering herd problem
Each working thread works with its own epoll. Each connection is handled by it's own coroutine
If provided with timeout value in seconds, server can drop idle connections after accepted connection doesn't act for specified time

#include "HTTP/BaseHTTPServer.hpp"

using namespace HW::HTTP;

class Server : public BaseHTTPServer {
public:
    Server(size_t numThreads) 
    : BaseHTTPServer{numThreads} {}
    
    HTTPResponse onRequest(const HTTPRequest &r) {
        ... handle request and create response ...
        return HTTPResponse{};
    }
};

int main() {
    // Can be used for logging - HW::Logger::get_instance().set_global_logger(HW::create_stderr_logger(HW::Level::ALL));
    Server s(4);               // Create server with 4 working threads
    s.open("127.1.1.1", 8888); // Opens server with address 127.1.1.1:8888
    s.listen(1000);            // Server can now accept clients (queue size is set to 1000)
    s.run(5000);               // Server is running (epoll wait timeout is set to 5 seconds)
    return 0;
}

Server uses singleton logger from hw2
Classes guarantee Exception safety and uses RAII idiom
Classes are made for use on OS Linux
// TODO: Replace coroutines with std coroutines after C++20 release

hw7-Shared_Memory_File

Classes HW::File::Reader and HW::File::LRUCacheReader that can memory map big binary files filled with
Entries { uint64_t key; Data data; }
Readers can quickly give pointer to Entry in file with requested key
LRUCacheReader contains LRU Cache to access cached Entries at O(1)
Classes guarantee Exception safety and uses RAII idiom
Classes are made for use on OS Linux

Installation and compiling

# Clone repo to your PC
git clone https://github.com/sltn011/AdvCpp-HW.git  
cd AdvCpp-HW/

# Choose wanted project folder
cd hw../

# Create Makefile with CMake
cmake CMakeLists.txt

# Compile libraries and executables
make