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\section{Introducing Garage}
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\begin{frame}{Brought to you by the Deuxfleurs association}
\begin{block}{\textbf{deuxfleurs.fr} -- a libre hosting association with a vision}
``Shifting the current structure of the Internet from a world of a few very large service providers, to a world where services are hosted by a variety of smaller organisations.''
\end{block}
\begin{block}{Our goals}
\begin{itemize}
\item To propose performant \& reliable libre services for the masses
\item To host and administer our infrastructure ourselves
\item To allow members to contribute storage/compute nodes
\item Resilience: for availability \& the sysadmins' sleep
\item Conceptual simplicity to ease onboarding \& demistify hosting
\end{itemize}
\end{block}
\end{frame}
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\begin{frame}{The lacking state of the practice}
\begin{block}{Object storage fitted our needs}
\begin{itemize}
\item Distributed by design
\item Objects are replicated
\item Conceptually simple
\end{itemize}
\end{block}
\vfill
\begin{block}{Existing object stores did not}
\begin{itemize}
\item Too specific / complex
\item Resource hungry
\item Hidden constraints
\end{itemize}
\end{block}
\vfill
We developed Garage, an object store with minimal functionality.
It works, and serves our static sites and media.
\end{frame}
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\begin{frame}{Introducing Garage}
\centering
\url{garagehq.deuxfleurs.fr}
\url{git.deuxfleurs.fr/Deuxfleurs/garage}
\includegraphics[width=.4\columnwidth]{figures/garage_distributed.png}
\vfill
\raggedright
\begin{itemize}
\item Distributed data store
\item Based on DynamoDB object store (P2P!)
\item Modular data types/protocols with CRDTs:
\begin{itemize}
\item Done: objects (media, static sites, backups...) via S3 API
\item To do: e-mails via IMAP protocol, and more
\end{itemize}
\end{itemize}
\end{frame}
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\begin{frame}[t]{The \textbf{RING}}
\centering
\fullcite{decandia_dynamo:_2007}
\vspace{3ex}
\only<1>{\includegraphics[width=.5\columnwidth]{figures/c1.pdf}}%
\only<2>{\includegraphics[width=.5\columnwidth]{figures/c2.pdf}}%
\only<3>{\includegraphics[width=.5\columnwidth]{figures/c3.pdf}}%
\only<4>{\includegraphics[width=.5\columnwidth]{figures/c4.pdf}}%
\vspace{5ex}
%\raggedright
\only<1>{Each node is assigned a unique ID on the circular address space.}%
\only<2-3>{When a new object is added to the store...}%
\only<3>{\\ It is assigned a unique ID (its \emph{key}) on the address space.}%
\only<4>{The $R$ nodes after the object are in charge of replicating it.}%
\end{frame}
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\begin{frame}{Distributed metadata}
\centering
\includegraphics[width=.8\columnwidth]{figures/garage_tables.pdf}
\vfill
The objects, versions and blocks are all stored in the ring.
\end{frame}
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\begin{frame}{Written in Rust}
\begin{columns}
\column{.65\columnwidth}
Entirely written in Rust!
\column{.35\columnwidth}
\centering
\includegraphics[width=.85\columnwidth]{figures/rustacean-flat-happy.png}
\end{columns}
\vfill
\begin{columns}
\column[t]{.6\columnwidth}
\textbf{Pros:}
\begin{itemize}
\item Compiled and fast
\item Features prevent usual mistakes:
strongly typed, immutable by default, ownership instead of GC...
\item Best of several paradigms:
imperative, OO, functional
\item Good libraries for network programmings:
serialization, http, async/await...
\end{itemize}
\column[t]{.4\columnwidth}
\textbf{Cons}:
\begin{itemize}
\item Steep learning curve
\item Long compilation times
\item Compiler rage
\end{itemize}
\end{columns}
\end{frame}
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