commit f1cd4f82bb5022168487c476074c8addfadc279c
parent 4a83288341cca887481a09b77b8ac30264856846
Author: Antoine A <>
Date: Thu, 27 Jan 2022 18:45:03 +0100
presentation: progress
Diffstat:
| M | docs/presentation.tex | | | 138 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------- |
1 file changed, 114 insertions(+), 24 deletions(-)
diff --git a/docs/presentation.tex b/docs/presentation.tex
@@ -33,10 +33,10 @@
\begin{block}{Common blockchain limitation}
\begin{itemize}
- \item \textbf{Delayed} block and confirmation delay
- \item \textbf{Expensive} transaction fees
+ \item \textbf{Delay} block and confirmation delay
+ \item \textbf{Cost} transaction fees
\item \textbf{Scalability} limited amount of transaction per seconds
- \item \textbf{Ecological cost} computation redundancy
+ \item \textbf{Ecological impact} computation redundancy
\item \textbf{Privacy}
\end{itemize}
\end{block}
@@ -80,21 +80,47 @@
\begin{frame}{Taler}{Off the chain transaction}
\begin{center}
\begin{tikzpicture}[
- rect/.style={rectangle, draw=black},
- sym/.style={<->, shorten >= 2pt, shorten <= 2pt}
+ rect/.style={rectangle, draw=black, minimum width=28mm},
+ sym/.style={<->, shorten >= 2pt, shorten <= 2pt},
+ block/.style={rectangle,draw=black,fill=black!10,minimum size=7mm},
]
+
+ %% Architecture
+
\node(Tt){Taler};
\node[rect, below=0cm of Tt](Tc){Exchange};
\node[rect, fit={(Tt) (Tc)}](T){};
- \node[rect, below= of Tc](D) {Depolymerization};
+ \node[rect, below=7mm of Tc](D) {Depolymerization};
- \node[rect, below= of D](Bc){Node};
- \node[below=0cmof Bc](Bt){Blockchain};
+ \node[rect, below=7mm of D](Bc){Node};
+ \node[below=0cm of Bc](Bt){Blockchain};
\node[rect, fit={(Bt) (Bc)}](B){};
\draw[sym] (T) -- (D);
\draw[sym] (D) -- (B);
+
+ %% Blockchain
+ \node[block,right=7mm of B] (1){};
+ \node[block,right=4mm of 1] (2){};
+ \node[block,right=4mm of 2] (3){};
+ \node[block,right=4mm of 3] (4){};
+ \node[block,right=4mm of 4] (5){};
+ \node[block,right=4mm of 5] (6){};
+ \draw[->] (1) -- (2);
+ \draw[->] (2) -- (3);
+ \draw[->] (3) -- (4);
+ \draw[->] (4) -- (5);
+ \draw[->] (5) -- (6);
+
+ %% Taler
+ \node[block, right=18mm of T] (off){Off-chain transactions};
+
+ % Depolymerization
+ \node[right=11mm of D] {\small{Deposit}};
+ \node[right=49mm of D] {\small{Withdraw}};
+ \draw[dashed,->] (1.north) |- (off.west);
+ \draw[dashed,->] (off.east) -| (6.north);
\end{tikzpicture}
\end{center}
\end{frame}
@@ -109,41 +135,106 @@
\begin{frame}{Depolymerization}{Architecture}
\begin{center}
\begin{tikzpicture}[
- rect/.style={rectangle, draw=black},
+ rect/.style={rectangle, draw=black, minimum height=6mm, minimum width=28mm},
sym/.style={<->, shorten >= 2pt, shorten <= 2pt}
]
\node[rect](1) {Taler Exchange};
- \node[rect, below= of 1](2) {wire\_gateway};
- \node[rect, right= of 2](3) {PostgreSQL};
- \node[rect, right= of 3](4) {\#\#\#\_wire};
- \node[rect, above= of 4](5) {Full Node};
-
- \draw[sym] (1) -- node [midway, right] {\tiny HTTP} (2);
- \draw[sym] (2) -- node [midway, above] {\tiny SQL} (3);
- \draw[sym] (3) -- node [midway, above] {\tiny SQL} (4);
- \draw[sym] (4) -- node [midway, left] {\tiny RPC} (5);
+ \node[rect,below=of 1](2) {wire\_gateway};
+ \node[rect,right=of 2](3) {PostgreSQL};
+ \node[rect,right=of 3](4) {\#\#\#\_wire};
+ \node[rect,above=of 4](5) {Full Node};
+
+ \draw[sym] (1) -- node [midway,right] {\tiny HTTP} (2);
+ \draw[sym] (2) -- node [midway,above] {\tiny SQL} (3);
+ \draw[sym] (3) -- node [midway,above] {\tiny SQL} (4);
+ \draw[sym] (4) -- node [midway,left ] {\tiny RPC} (5);
\end{tikzpicture}
\end{center}
+ Two processes sharing a common database for state and communication. wire\_gateway is currency agnostic and there is a specific wire binary for every supported currency.
\end{frame}
\section{btc\_wire}
\begin{frame}{btc\_wire}{Architecture}
- Three loops
- Watcher: Notify other loops when a new block has been mined
- Analyzer: Analyse blockchain to adapt defensively
- Worker: Sync chain -> Send -> Bounce
+ \begin{center}
+ \begin{tikzpicture}[
+ rect/.style={rectangle, draw=black, minimum height=6mm, minimum width=38mm},
+ ]
+
+ % Watcher loop
+ \node(wat) {Watcher};
+ \node[rect, below=1mm of wat](wa1) {Wait for new block};
+ \node[rect, below=4mm of wa1](wa2) {Notify new block};
+ \draw[->] (wa1) -- (wa2);
+ \draw[->] (wa2) .. controls ([xshift=-0.3cm] wa2.west) and ([xshift=-0.3cm] wa1.west) .. (wa1);
+
+ % Analysis loop
+ \node[below=5mm of wa2] (at) {Analysis};
+ \node[rect, below=1mm of at](a1) {Wait for notification};
+ \node[rect, below=4mm of a1](a2) {Analyse};
+ \draw[->] (a1) -- (a2);
+ \draw[->] (a2) .. controls ([xshift=-0.3cm] a2.west) and ([xshift=-0.3cm] a1.west) .. (a1);
+
+ % Worker loop
+ \node[rect, below right= -2mm and 1cm of wa1](wo1) {Wait for notification};
+ \node[rect, below=4mm of wo1](wo2) {Synchronize};
+ \node[rect, below=4mm of wo2](wo3) {Send};
+ \node[rect, below=4mm of wo3](wo4) {Bounce};
+ \node[above=1mm of wo1]{Worker};
+ \draw[->] (wo1) -- (wo2);
+ \draw[->] (wo2) -- (wo3);
+ \draw[->] (wo3) -- (wo4);
+ \draw[->] (wo4) .. controls ([xshift=-0.4cm] wo4.west) and ([xshift=-0.4cm] wo1.west) .. (wo1);
+ \end{tikzpicture}
+ \end{center}
+ \centering
+ Three concurrent loops
\end{frame}
\begin{frame}{btc\_wire}{Security features}
\begin{itemize}
\item Reorg resilient
- \item Handle stuck transaction
+ \item Resolve stuck transaction
\item Adaptive confirmation
\end{itemize}
\end{frame}
\begin{frame}{btc\_wire}{Reorg resilient}
+ \begin{center}
+ \begin{tikzpicture}[
+ block/.style={rectangle,draw=black,fill=black!10,minimum size=7mm},
+ ]
+ % Common
+ \node [block](1){1};
+ \node [block, right=5mm of 1](2){2};
+ \node [block, right=5mm of 2](3){3};
+ \draw[->] (1) -- (2);
+ \draw[->] (2) -- (3);
+
+ % Current
+ \node [block, right=5mm of 3](4){4};
+ \node [block, right=5mm of 4](5){5};
+ \node [block, right=5mm of 5](6){6};
+ \draw[->] (3) -- (4);
+ \draw[->] (4) -- (5);
+ \draw[->] (5) -- (6);
+
+ % Fork
+ \node [block, above=7mm of 4](4p){4'};
+ \node [block, right=5mm of 4p](5p){5'};
+ \node [block, right=5mm of 5p](6p){6'};
+ \node [block, right=5mm of 6p](7p){7};
+ \draw[->] (3.east) -- (4p.west);
+ \draw[->] (4p) -- (5p);
+ \draw[->] (5p) -- (6p);
+ \draw[->] (6p) -- (7p);
+
+ % Indication
+ \node [right=5mm of 7p]{\emph{fork}};
+ \node [right=17mm of 6]{\emph{active}};
+ \end{tikzpicture}
+ \end{center}
+ A fork is when concurrent blockchain state coexists. Node will follow the longest chain replacing recent blocks if necessary. This is a blockchain reorganisation.
\end{frame}
\begin{frame}{btc\_wire}{Handle stuck transactions}
@@ -175,7 +266,6 @@
\node [dot, above=15.5mm of C](D2) {};
\draw [dotted] (C) -- (D2);
};
-
\end{tikzpicture}
\end{center}
\only<1>{However, transaction fees are variable and can only be predicted}
