cgit/tests/setup.sh
Lars Hjemli 939d32fda7 Redesign the caching layer
The original caching layer in cgit has no upper bound on the number of
concurrent cache entries, so when cgit is traversed by a spider (like the
googlebot), the cache might end up filling your disk. Also, if any error
occurs in the cache layer, no content is returned to the client.

This patch redesigns the caching layer to avoid these flaws by
* giving the cache a bound number of slots
* disabling the cache for the current request when errors occur

The cache size limit is implemented by hashing the querystring (the cache
lookup key) and generating a cache filename based on this hash modulo the
cache size. In order to detect hash collisions, the full lookup key (i.e.
the querystring) is stored in the cache file (separated from its associated
content by ascii 0).

The cache filename is the reversed 8-digit hexadecimal representation of

  hash(key) % cache_size

which should make the filesystem lookup pretty fast (if directory content
is indexed/sorted); reversing the representation avoids the problem where
all keys have equal prefix.

There is a new config option, cache-size, which sets the upper bound for
the cache. Default value for this option is 0, which has the same effect
as setting nocache=1 (hence nocache is now deprecated).

Included in this patch is also a new testfile which verifies that the
new option works as intended.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2008-04-28 11:32:42 +02:00

117 lines
2.3 KiB
Bash
Executable File

# This file should be sourced by all test-scripts
#
# Main functions:
# prepare_tests(description) - setup for testing, i.e. create repos+config
# run_test(description, script) - run one test, i.e. eval script
#
# Helper functions
# cgit_query(querystring) - call cgit with the specified querystring
# cgit_url(url) - call cgit with the specified virtual url
#
# Example script:
#
# . setup.sh
# prepare_tests "html validation"
# run_test 'repo index' 'cgit_url "/" | tidy -e'
# run_test 'repo summary' 'cgit_url "/foo" | tidy -e'
mkrepo() {
name=$1
count=$2
dir=$PWD
test -d $name && return
printf "Creating testrepo %s\n" $name
mkdir -p $name
cd $name
git init
for ((n=1; n<=count; n++))
do
echo $n >file-$n
git add file-$n
git commit -m "commit $n"
done
cd $dir
}
setup_repos()
{
rm -rf trash/cache
mkdir -p trash/cache
mkrepo trash/repos/foo 5 >/dev/null
mkrepo trash/repos/bar 50 >/dev/null
cat >trash/cgitrc <<EOF
virtual-root=/
cache-root=$PWD/trash/cache
cache-size=1021
snapshots=tar.gz tar.bz zip
enable-log-filecount=1
enable-log-linecount=1
summary-log=5
summary-branches=5
summary-tags=5
repo.url=foo
repo.path=$PWD/trash/repos/foo/.git
# Do not specify a description for this repo, as it then will be assigned
# the constant value "[no description]" (which actually used to cause a
# segfault).
repo.url=bar
repo.path=$PWD/trash/repos/bar/.git
repo.desc=the bar repo
EOF
}
prepare_tests()
{
setup_repos
rm -f test-output.log 2>/dev/null
test_count=0
test_failed=0
echo "[$0]" "$@" >test-output.log
echo "$@" "($0)"
}
tests_done()
{
printf "\n"
if test $test_failed -gt 0
then
printf "test: *** %s failure(s), logfile=%s\n" \
$test_failed "$(pwd)/test-output.log"
false
fi
}
run_test()
{
desc=$1
script=$2
((test_count++))
printf "\ntest %d: name='%s'\n" $test_count "$desc" >>test-output.log
printf "test %d: eval='%s'\n" $test_count "$2" >>test-output.log
eval "$2" >>test-output.log 2>>test-output.log
res=$?
printf "test %d: exitcode=%d\n" $test_count $res >>test-output.log
if test $res = 0
then
printf " %2d) %-60s [ok]\n" $test_count "$desc"
else
((test_failed++))
printf " %2d) %-60s [failed]\n" $test_count "$desc"
fi
}
cgit_query()
{
CGIT_CONFIG="$PWD/trash/cgitrc" QUERY_STRING="$1" "$PWD/../cgit"
}
cgit_url()
{
CGIT_CONFIG="$PWD/trash/cgitrc" QUERY_STRING="url=$1" "$PWD/../cgit"
}