Artist Daemon

Back-end code for artist.tekuma.io

Handles image resizing, jobs, etc

NOTE: Use Node.js LTS version v(6.9.1) NOTE: NPM v3.8.10

Using Server

• Log in via SSH to server1 (10.142.0.2) from Google Cloud Console Using the unix username 'stephen'

• IF returning: tmux a -t artist to go to active process.

• IF restarted: go to /tekuma/artist-server

• tmux new -s artist

• Run sudo node artist-daemon.js to start the server code

image_daemon.js

The image daemon handles all back-end processes. Rather than using an HTTP interface with node (like express and AJAX), the artist portal creates "jobs" in the artist-tekuma database, at: https://console.firebase.google.com/project/artist-tekuma-4a697/database/data/jobs

The image_daemon listens for any changes to this branch of the DB, and pops jobs off as they arrive. The script loads in all jobs, then executes them in a stack (only 2 concurrently).

Image resizing daemon uses the Jimp library for image operations. Jimp was originally chosen due to its ability to run in any NodeJS container/engine/cloud function, and for having zero dependencies.

Jobs on the server will be received as JSONs from the firebase DB. They should have the form:

-KYAOSwR5VFOM1d7oj-2: {
    bucket   : "art-uploads",             // the GC bucket fullsize image is in
    complete : true,                      // if the job has been Successfully completed.
    completed: "2016-12-04T19:53:20.947Z" // When job was marked complete.
    file_path: "portal/vqy3UGVZQzN7GjHQeeFBKhe7wY72/uploads/-KYAOSm2qS6-EuwXOgME",
                          // the path to the image, inside of the bucket.
    job_id   : "-KYAOSwR5VFOM1d7oj-2",     // UID for this job
    name     : "-KYAOSm2qS6-EuwXOgME" ,    // the Artwork UID of the image
    submitted: "2016-12-04T19:53:20.947Z", // time job was created
    task     : "resize",  // what the job is (resize || tag || submit)
    uid      : "vqy3UGVZQzN7GjHQeeFBKhe7wY72"  //the user's UID
}

Keys

The image-daemon has global read and write access to the curator-tekuma and artist-tekuma-4a697 Google Cloud/Firebase projects. This is via the service keys in the /auth directory. NOTE: Sensitive!!!

These keys enable use of the firebase-admin npm library, instead of firebase. These have administrative privileged over all data.

Security

The server, a Google Compute Engine instance called server1, should:

• Only be accessible from SSH, not HTTP

Notes about tmux

CheatSheet

• Kill all sessions:

• tmux ls | grep : | cut -d. -f1 | awk '{print substr($1, 0, length($1)-1)}' | xargs kill

• Kill session:

• tmux kill-session -t myname

• Begin session:

• tmux new -s myname

• Attach to session:

• tmux a -t myname

• List all sessions:

• tmux ls

Dependencies

• tmp
• GCloud
• imagemagick
• NOTE this is just the node client. The imagemagick suite must also be installed. On ubuntu, it can be install via sudo apt-get install imagemagick