tinyDLM

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Multi-threaded C++ download manager built around cURLpp / ncurses

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# tinyDLM - A C++ download manager

![tinyDLM](https://raw.githubusercontent.com/guimauveb/tinyDLM/master/imgs/logo.png)

## Small multi-threaded download manager built around cURLpp / ncurses

I've never encountered a simple yet efficient download manager that would be free AND still maintained.

So I decided to build my own and figured out it would be a great way to learn more about C++, multithreading, sockets and desktop applications and I did learn a lot along the way !

I could have used multiple non blocking sockets instead of threads and therefore only use one thread for the download manager part, but I really wanted to learn more about multithreading and its pitfalls.

The main window is actually made of 2 subwindows: the downloads list displayed as a curses menu and a 'downloads status' window sitting next to it and updated in its own thread.
Using different threads for windows was also a challenge since curses (actually ncurses) is not multi-thread safe, but using C++ mutexes I managed to make it work smoothly.

I plan on adding some other useful features like limiting the number of simultaneous transfers or adding more than one link at the same time.

**NOTE**: install.sh doesn't work on Big Sur. I have to make a few changes in CMakeLists.txt. In the meantime use the command in **compileMacOs.txt** to compile.

## Features:
    - Works on macOS (>= 10.14) and Linux Debian based distributions
    - Supports Direct Download Links
    - Supports simultaneous transfers (tested up to 32)
    - Transfers can be paused / resumed / killed
    - Inactive transfers can be cleared from the list
    - Displays current download speed and progress for each transfer
    - Displays current transfer status
    - Signals user input and URL / HTTP errors
    - Very low CPU / memory consumption
    - Partially supports adding multiple links at the same time

## Installation

Works on **Linux Debian based distributions** and **macOS (>= 10.14)**
    
1. Make sure you have the following dependencies installed:
```
    cmake
```

2. Clone this repo
```
    git clone https://github.com/guimauveb/tinyDLM.git
```

3. Run **install.sh**

## Tested on: 
- ~~macOS Big Sur (>= 11.0)~~
- **macOS Mojave (10.14.6)** 
- **Linux Ubuntu (20.04 LTS)**
- **Kali Linux (20.03)**

## Notes
**On macOS Big Sur, since an unkown change the linker is unable to find some libraries. Unfortunately I don't have time to investigate. It still works fine on Linux and previous macOS versions.**

## Details about the code
The code uses the following style convention:
```
- ProperCase class and struct names.
- camelCase functions (lower case initial letter).
- snake_case variables.
```

**NOTE:** I'm still working on improving the code and code style.

## Missing features that I certainly won't implement
    - [X] Duplicate filename checker 
    - [X] Create a "settings" window
    - [X] Set download directory (transfers are stored by default in ~/Downloads/tinyDownloads/) 
    - [X] Set the default number of simultaneous transfers to the number of CPU cores / threads
    - [ ] Set the number of max simultaneous transfers  
    - [ ] Set maximum download speed
    - [ ] Add multiple links at the same time 
    - [ ] Use a database to store downloads state
    - [ ] Limit download speed in DownloaderCore 
    - [ ] Schedule download start  
    - [ ] Compute / Display ETA

tinyDLM

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