auto backup mongo (ruby version and very concise)

autobackupmongo.rb

# Instead of backing up on set days this will check the time differences 
# between the last backup and the time the script running.

# Useful if you're backing up irregularly on a laptop

#!/usr/local/ruby/bin/ruby -w



require 'time'

Backpath    = "" # backup directory 
Host        = ""                     # mongo host to connect,empty is for local
Database    = ""                     # database to use. empty is for all
Collection  = ""  # collection to use 
User        = ""
Passwd      = ""
Port        = ""
Now         = Time.now
DATE        = Now.strftime("%Y-%m-%d")


Lastweek  = Now - (60*60*24*7)
Lastmonth = Now - (60*60*24*30)






# Form request options
opt = ""
opt = opt << " --host #{Host}" unless Host.empty?
opt = opt << " --port #{Port}" unless Port.empty?
opt = opt << " --username #{User} --password #{Passwd}" unless User.empty?
opt = opt << " --db #{Database}" unless Database.empty?
opt = opt << " --collection #{Collection}" unless Collection.empty?
Opt = opt


def dbdump(bkpath)
    puts "mongodump --out #{bkpath} #{Opt}"
    `/usr/local/bin/mongodump --out #{bkpath} #{Opt}` 
#   sleep(60*1)
end

# Removes old backups
def remove_old(folder, time_from)
  filenames = Dir.entries("#{Backpath}/#{folder}/").select {|filename| /^(\d+)-(\d+)-(\d+)$/.match(filename)}
  # Remove old backup
  filenames.each do |filename|
    `rm -rf "#{Backpath}/#{folder}/#{filename}/"` if Time.parse(filename) < time_from
  end
end

# Check if backup is required
def entries(folder)
  filenames = Dir.entries("#{Backpath}/#{folder}/").select {|filename| /^(\d+)-(\d+)-(\d+)$/.match(filename)} 
end

def last_time(entries)
  entries.empty? ? nil : Time.parse(entries[entries.length-1])
end




#Create required directory
#first check backup directory exist?
if Dir[Backpath] == [] 
    `mkdir -p #{Backpath}`
end

#check daily exist?
if Dir["#{Backpath}/daily"] == [] 
    `mkdir -p '#{Backpath}/daily'`
end

#check weekly exist?
if Dir["#{Backpath}/weekly"] == [] 
    `mkdir -p '#{Backpath}/weekly'`
end

#check monthly exist?
if Dir["#{Backpath}/monthly"] == [] 
    `mkdir -p '#{Backpath}/monthly'`
end

#make monthly backup
monthly_entries = entries('monthly')
if monthly_entries.empty? || last_time(monthly_entries) < Lastmonth   

  puts "Monthly backup begin.."
  bkpath=Backpath+"/monthly/"+DATE
  dbdump bkpath

end



#make daily backup
weekly_entries = entries('weekly')
if weekly_entries.empty? || last_time(weekly_entries) < Lastweek
  # Delete backups older than a month"
  remove_old("weekly", Lastmonth)
   
    puts "Weekly backup begin.."
    bkpath=Backpath+"/weekly/"+DATE
    dbdump bkpath
end


daily_entries = entries('daily')


if daily_entries.empty? || !(last_time(daily_entries) == DATE)
    puts "Delete backup 7 days ago"
    remove_old("daily", Lastweek)
    bkpath=Backpath+"/daily/"+DATE
    puts "Daily backup begin..."
    dbdump bkpath
end