Easy way that compress files in ruby is using zip lib.
Zip::File.open('./compress.zip', create: true) do |zip|
zip.get_output_stream("./stuff_to_ziped.pdf") do |f|
f.puts File.read("./stuff_to_zip.pdf")
end
end
When you need to zip larger files or when you need to perform any task that requires opening many files, good practice is to avoid loading all files into memory. To achieve this, you can use stream operations available in IO classes.
Let's look at the code above again but with a thread that monitory the memory for us.
Thread.new do
loop do
print "\r memory: %d MB" % "#{`ps -o rss= -p #{Process.pid}`.to_i/1024}\t"
end
end
Zip::File.open('./compress.zip', create: true) do |zip|
zip.get_output_stream("./stuff_to_ziped.pdf") do |f|
f.puts File.read("./stuff_to_zip.pdf")
end
end
Now you can see how much memory the program consumis until done. The method File.read load all bytes of file in memory. Lets see other implementation.
Thread.new do
loop do
print "\r memory: %d MB" % "#{`ps -o rss= -p #{Process.pid}`.to_i/1024}\t"
end
end
Zip::File.open('./compactados.zip', create: true) do |zip|
10.times do |i|
zip.get_output_stream("./copy_#{i}.pdf") do |f|
input = File.new("./copy_#{i}.pdf")
while !input.eof?
f.puts(input.gets)
end
end
end
end
