docker-tools/dps.rb

#!/usr/bin/env ruby
require 'json'
require 'socket'
require 'net/http'

COLOR_GREEN = ""
COLOR_RED   = ""
COLOR_GRAY  = ""
COLOR_RESET = ""

class Container
	FIELDS = [:state, :dup, :ouroboros, :name, :vhosts, :nginx_allow, :status, :image, :ports]
	@@lengths = Hash.new(0)
	
	def initialize(data)
		@strings = {}
		@data = data
		
		set :state, (@data[:State]=="running" ? COLOR_GREEN : COLOR_RED) + @data[:State].capitalize + COLOR_RESET
		set :dup, @data[:Labels][:"de.fabianonline.dup"]=="true" ? "✓" : ""
		set :ouroboros, @data[:Labels][:"com.centurylinklabs.watchtower.enable"]=="true" ? "✓" : ""
		set :name, @data[:Names].first[1..-1]
		
		vh = @data[:Labels][:"nginx_virtual_host"]&.split(",")&.collect(&:strip)
		if vh.nil? || vh.count==0
			vh = ""
		elsif vh.count==1
			vh = vh.first
		else
			if FULL
				vh = vh.join(", ")
			else
				vh = vh.first + ",…"
			end
		end
		
		set :vhosts, vh
		
		p = @data[:Ports].sort_by{|p| p[:PrivatePort]}.collect do |p|
			type = p[:Type]=="tcp" ? "" : "/#{p[:Type]}"
			if p[:PrivatePort]==p[:PublicPort]
				"#{COLOR_GREEN}#{p[:PrivatePort]}#{type}"
			elsif p[:PublicPort]==nil
				"#{COLOR_GRAY}#{p[:PrivatePort]}#{type}"
			else
				"#{COLOR_RED}#{p[:PrivatePort]}->#{p[:PublicPort]}#{type}"
			end
		end.join(" ")
		
		set :nginx_allow, @data[:Labels][:"nginx_allow"]
		st = @data[:Status]
		if st.end_with?("(healthy)")
			st = COLOR_GREEN + st.gsub("(healthy)", "(v)") + COLOR_RESET
		elsif st.end_with?("(unhealthy)")
			st = COLOR_RED + st.gsub("(unhealthy)", "(x)") + COLOR_RESET
		end
		set :status, st
		im = @data[:Image]
		im = im.split(":")[0] unless FULL
		set :image, im
		set :ports, p
	end
	
	def set(key, value)
		@data[key] = value
		@@lengths[key] = [@@lengths[key], value.cleaned.length].max if value
	end
	
	def self.lengths; FIELDS.map{|k| @@lengths[k]}; end
	
	def data
		FIELDS.map{|k| @data[k]}
	end
end

class String
	def cleaned
		self.gsub(/\[.+?m/, "")
	end

	def fix_length(len)
		l = self.cleaned.length
		shortened = self.length - l
		
		if l >= len
			return self.slice(0, len + shortened)
		else
			return self + (" " * (len - l))
		end
	end
end

def fetch_data
	socket = UNIXSocket.new("/var/run/docker.sock")
	request = "GET /v1.24/containers/json?all=1 HTTP/1.0\r\n\r\n"#Host: localhost\r\n\r\n"
	socket.write(request)

	response = ""

	loop do
		break if socket.eof?
		line = socket.gets
		break if line=="\r\n"
	end

	until socket.eof?
		line = socket.gets
		response += line
	end

	return JSON.parse(response, symbolize_names: true)
end

FULL = ARGV[0]=="--full"

data = fetch_data
data = data.map{|c| Container.new(c).data}

lengths = Container.lengths

data.sort_by{|d| d[3]}.each do |row|
	row.each_with_index do |d, index|
		if index==row.length-1
			print d.to_s
		else
			print d.to_s.fix_length(lengths[index]) + "  "
		end
	end
	puts
end