kotovalexarian-likes-gitlab/gitlab-org--gitlab-foss
1
0
Fork 0
Code Releases Activity

Optimize reverse_line

Browse source
This commit is contained in:
Shinya Maeda 2017-05-17 20:21:13 +09:00
parent 6be609dd64
commit 8c1b07e0cc
1 changed files with 13 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
lib/gitlab/ci/trace/stream.rb
View file

@ -96,30 +96,31 @@ module Gitlab
end
def reverse_line
pos = BUFFER_SIZE
pos = 0
max = stream.size
debris = ''
while pos < max
while (read_size = calc_read_size(pos, max)) > 0
pos += read_size
stream.seek(-pos, IO::SEEK_END)
stream.read(BUFFER_SIZE).tap do |buf|
stream.read(read_size).tap do |buf|
buf = buf + debris
debris, *lines = buf.each_line.to_a
lines.reverse_each do |line|
yield(line)
end
end
pos += BUFFER_SIZE
end
# Reached the head, read only left
stream.seek(0)
last = (max > BUFFER_SIZE) ? (max % BUFFER_SIZE) : max
stream.read(last).tap do |buf|
buf = buf + debris
buf.each_line.reverse_each do |line|
yield(line)
end
yield(debris) if debris != ''
end
def calc_read_size(pos, max)
if pos > max
BUFFER_SIZE + (pos - max)
else
remain = max - pos
(remain > BUFFER_SIZE) ? BUFFER_SIZE : remain
end
end
end