playground/web-doc/vitess.md

# Vitess


```blockdiag
diagram login {
  client [label = "Client"];

  gw_sniproxy [label = "sniproxy"]
  gw_nginx [label = "nginx"]
  gw_redirect_pl [label = "redirect.pl"]

  client -> gw_sniproxy -> gw_nginx;
  gw_nginx ->gw_redirect_pl;
}
```

```blockdiag
diagram get-page-uuid {
  index [ label = "login/index.ant" ]
  inc-main [ label = "modules/policy/inc-main.php" ]
  sql [ label = "SELECT location.location_group_id, settings FROM ant_policies.location LEFT JOIN ant_policies.policy ON location.location_group_id = policy.location_group_id WHERE ppli =\"eth0\"" ]

  index -> inc-main -> sql;
}
```

```mermaid
graph LR
    A --- B
    B-->C[fa:fa-ban forbidden]
    B-->D(fa:fa-spinner);
```

```c
#include <stdio.h>
int main ()
{
    printf ("hello, world\n");
    return 0;
}
```

```mermaid
mindmap
  root((mindmap))
    Origins
      Long history
      ::icon(fa fa-book)
      Popularisation
        British popular psychology author Tony Buzan
    Research
      On effectivness<br/>and features
      On Automatic creation
        Uses
            Creative techniques
            Strategic planning
            Argument mapping
    Tools
      Pen and paper
      Mermaid
```

```c

#include <stdio.h>

// Function to add two numbers
int add(int a, int b) {
    return a + b;
}

// Function to subtract two numbers
int subtract(int a, int b) {
    return a - b;
}

// Function that accepts a function pointer as a parameter
int calculate(int (*operation)(int, int), int a, int b) {
    return operation(a, b);
}

int main() {
    int x = 100, y = 200;
    int sum = calculate(add, x, y);
    int diff = calculate(subtract, x, y);
    printf("Sum: %d\n", sum);
    printf("Difference: %d\n", diff);
    return 0;
}
```

```bytefield
(defattrs :bg-green {:fill "#a0ffa0"})
(defattrs :bg-yellow {:fill "#ffffa0"})
(defattrs :bg-pink {:fill "#ffb0a0"})
(defattrs :bg-cyan {:fill "#a0fafa"})
(defattrs :bg-purple {:fill "#e4b5f7"})

(defn draw-group-label-header
  [span label]
  (draw-box (text label [:math {:font-size 12}]) {:span span :borders #{} :height 14}))

(defn draw-remotedb-header
  [kind args]
  (draw-column-headers)
  (draw-group-label-header 5 "start")
  (draw-group-label-header 5 "TxID")
  (draw-group-label-header 3 "type")
  (draw-group-label-header 2 "args")
  (draw-group-label-header 1 "tags")
  (next-row 18)

  (draw-box 0x11 :bg-green)
  (draw-box 0x872349ae [{:span 4} :bg-green])
  (draw-box 0x11 :bg-yellow)
  (draw-box (text "TxID" :math) [{:span 4} :bg-yellow])
  (draw-box 0x10 :bg-pink)
  (draw-box (hex-text kind 4 :bold) [{:span 2} :bg-pink])
  (draw-box 0x0f :bg-cyan)
  (draw-box (hex-text args 2 :bold) :bg-cyan)
  (draw-box 0x14 :bg-purple)

  (draw-box (text "0000000c" :hex [[:plain {:font-weight "light" :font-size 16}] " (12)"]) [{:span 4} :bg-purple])
  (draw-box (hex-text 6 2 :bold) [:box-first :bg-purple])
  (doseq [val [6 6 3 6 6 6 6 3]]
    (draw-box (hex-text val 2 :bold) [:box-related :bg-purple]))
  (doseq [val [0 0]]
    (draw-box val [:box-related :bg-purple]))
  (draw-box 0 [:box-last :bg-purple]))

(draw-remotedb-header 0x4702 9)

(draw-box 0x11)
(draw-box 0x2104 {:span 4})
(draw-box 0x11)
(draw-box 0 {:span 4})
(draw-box 0x11)
(draw-box (text "length" [:math] [:sub 1]) {:span 4})
(draw-box 0x14)

(draw-box (text "length" [:math] [:sub 1]) {:span 4})
(draw-gap "Cue and loop point bytes")

(draw-box nil :box-below)
(draw-box 0x11)
(draw-box 0x36 {:span 4})
(draw-box 0x11)
(draw-box (text "num" [:math] [:sub "hot"]) {:span 4})
(draw-box 0x11)
(draw-box (text "num" [:math] [:sub "cue"]) {:span 4})

(draw-box 0x11)
(draw-box (text "length" [:math] [:sub 2]) {:span 4})
(draw-box 0x14)
(draw-box (text "length" [:math] [:sub 2]) {:span 4})
(draw-gap "Unknown bytes" {:min-label-columns 6})
(draw-bottom)
```