jason-shen

const { devices, firefox, chromium } = require('playwright');
(async () => {
  const browser = await chromium.launch({headless: false});
  const context = await browser.newContext({
    permissions: ['geolocation', 'microphone', 'camera'],
    colorScheme: 'dark',
    recordVideo: {
      dir: 'videos/',
      size: { width: 1920, height: 1080 },
    }

jason-shen

// haversin(θ) function
func hsin(theta float64) float64 {
	return math.Pow(math.Sin(theta/2), 2)
}

// Distance function returns the distance (in meters) between two points of
//     a given longitude and latitude relatively accurately (using a spherical
//     approximation of the Earth) through the Haversin Distance Formula for
//     great arc distance on a sphere with accuracy for small distances
//

jason-shen

1.) Download a Nerd Font

2.) Unzip and copy to ~/.fonts

3.) Run the command fc-cache -fv to manually rebuild the font cache

jason-shen

#gstreamer mixer

gst-launch-1.0 -e \
videomixer name=mix background=1 \
        sink_1::xpos=0   sink_1::ypos=0 \
        sink_2::xpos=200 sink_2::ypos=0 \
        sink_3::xpos=0 sink_3::ypos=100 \
        sink_4::xpos=200 sink_4::ypos=100 \
    ! autovideosink \

jason-shen

//Self-Signed Certificate for using with VS Code Live Server

//Save both files in a location you will remember

1. create a private key
openssl genrsa -aes256 -out localhost.key 2048
// you will be prompted to provide a password
//this will create localhost.key (call it whatever you like)

2. create the certificate

jason-shen

Introduction

• C-a == Ctrl-a
• M-a == Alt-a

General

:q        close
:w        write/saves
:wa[!]    write/save all windows [force]
:wq       write/save and close

jason-shen

document.getElementById("btn").onclick = async () => {
  await run();
}

async function run() {
  let stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: false });

  /* sender */
  let sender = new RTCPeerConnection();
  sender.onicecandidate = e => receiver.addIceCandidate(e.candidate);

jason-shen

Caddy is ready to serve your site over HTTPS:

Point your domain's A/AAAA DNS records at this machine.
Upload your site's files to /var/www/html.
Edit your Caddyfile at /etc/caddy/Caddyfile:
Replace :80 with your domain name
Change the site root to /var/www/html
Reload the configuration: systemctl reload caddy
Visit your site!

jason-shen

FROM golang:1.6.2

COPY . /go

RUN go get github.com/nats-io/nats
RUN go build api-server.go

EXPOSE 8080
ENTRYPOINT ["/go/api-server"]

jason-shen

	httpsServer := &http.Server{
		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			hj, isHJ := w.(http.Hijacker)
			if r.Header.Get("Upgrade") == "websocket" && isHJ {
				c, br, err := hj.Hijack()
				if err != nil {
					log.Printf("websocket websocket hijack: %v", err)
					http.Error(w, err.Error(), 500)
					return
				}