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Location: kallithea/scripts/dbmigrate-test
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db: add some PullRequest.query() shortcuts
This makes database query code more explicit and increases readability.
E.g. the function name get_pullrequest_cnt_for_user was bad, because the
concept of "pullrequest for user" is incredibly vague, and could refer
to any kind of association between PRs and users. (Quiz time! Does it
mean that the user is the PR owner, that the user is reviewing, or that
the user has commented on the PR and thus is receiving notifications?)
A descriptive name could be "get_open_pull_request_count_for_reviewer",
because the function is indeed only concerned with reviewers and only
with open pull requests. But at this point, we might as well say
PullRequest.query(reviewer_id=user, include_closed=False).count()
which is only slightly longer, and doesn't require us to write dozens
of little wrapper functions (including, any moment now, a separate
function for listing the PRs instead of counting them).
Note that we're not actually going down an abstraction level by doing
this. We're still operating on the concepts of "pull request", "open"
and "reviewer", and are not leaking database implementation details.
The query() shortcuts are designed so they default to not altering
the query. Any processing requires explicit opt-in by the caller.
This makes database query code more explicit and increases readability.
E.g. the function name get_pullrequest_cnt_for_user was bad, because the
concept of "pullrequest for user" is incredibly vague, and could refer
to any kind of association between PRs and users. (Quiz time! Does it
mean that the user is the PR owner, that the user is reviewing, or that
the user has commented on the PR and thus is receiving notifications?)
A descriptive name could be "get_open_pull_request_count_for_reviewer",
because the function is indeed only concerned with reviewers and only
with open pull requests. But at this point, we might as well say
PullRequest.query(reviewer_id=user, include_closed=False).count()
which is only slightly longer, and doesn't require us to write dozens
of little wrapper functions (including, any moment now, a separate
function for listing the PRs instead of counting them).
Note that we're not actually going down an abstraction level by doing
this. We're still operating on the concepts of "pull request", "open"
and "reviewer", and are not leaking database implementation details.
The query() shortcuts are designed so they default to not altering
the query. Any processing requires explicit opt-in by the caller.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 | #!/bin/sh -e
if [ $# -lt 2 ] || [ $# -gt 3 ]; then
cat >&2 <<EOD
usage: $0 CONFIG_FILE FROM_REV [TO_REV]
Runs a database migration from FROM_REV to TO_REV (default: current
working directory parent), using the specified CONFIG_FILE (.ini file).
Test is run using a clean Kallithea install, in a temporary virtual
environment. FROM_REV and (optional) TO_REV should be Mercurial revision
identifiers (e.g. changeset hash or a version number tag). The working
directory is not touched, but the database referenced in the config file
will be (re)created.
Only SQLite is available out of the box; for MySQL or PostgreSQL, set
the EXTRA environment variable to the required package(s), and it'll
be installed in the virtual environment. (E.g. EXTRA=MySQL-python or
EXTRA=psycopg2.)
The temporary directory is not removed, allowing follow-up examination
of the upgrade results. It is, however, created in /tmp by default,
which many Linux distributions automatically clean at regular intervals.
EOD
exit 1
fi
config_file=$(readlink -f "$1")
from_rev=$2
to_rev=$3
source_repo=$(dirname "$(dirname "$(readlink -f "$0")")")
announce() {
echo
echo "$1"
echo
}
quiet_if_ok() (
local output
local st
set +e
output=$("$@" < /dev/null 2>&1)
st=$?
if [ $st -ne 0 ]; then
echo "$output" >&2
echo "Command $@ returned exit status $st." >&2
exit 1
fi
)
HG() {
"${HG:-hg}" --repository "$source_repo" "$@"
}
# If upgrading to "current revision", warn if working directory is dirty.
if [ ! "$to_rev" ] && [ "$(HG status -mard)" ]; then
announce "Warning: Uncommitted changes in working directory will be ignored!"
fi
from_rev_hash=$(HG id --id --rev "${from_rev:-.}")
to_rev_hash=$(HG id --id --rev "${to_rev:-.}")
temp=$(readlink -f "$(mktemp --tmpdir -d 'dbmigrate-test.XXXXXX')")
cat <<EOD
Config file: $config_file
EOD
sed -n -e 's/^sqlalchemy\.url *= */Database URL: /p' "$config_file"
cat <<EOD
Working dir: $temp
Repository: $source_repo
Upgrade from: $from_rev_hash (${from_rev:-current})
Upgrade to: $to_rev_hash (${to_rev:-current})
Extra packages: ${EXTRA:-(none)}
EOD
mkdir "$temp/repos" # empty
# Enable caching for old pip versions (this will cache the pip upgrade)
# Newer pip versions cache automatically, and don't use this variable.
if [ ! "$PIP_DOWNLOAD_CACHE" ]; then
export PIP_DOWNLOAD_CACHE=$HOME/.cache/pip/legacy
fi
install_kallithea() {
local prefix=$1
local rev=$2
announce "Installing Kallithea $rev in $prefix..."
"${VIRTUALENV:-virtualenv}" --quiet "$prefix-env"
HG archive --rev "$rev" "$prefix"
(
cd "$prefix"
. "$prefix-env/bin/activate"
pip install --quiet --upgrade pip setuptools mercurial $EXTRA
pip install --quiet -e .
)
}
install_kallithea "$temp/from" "$from_rev_hash"
(
cd "$temp/from"
. "$temp/from-env/bin/activate"
announce "Initializing database..."
quiet_if_ok paster setup-db "$config_file" --repos="$temp/repos" --user=doe --email=doe@example.com --password=123456 --no-public-access --force-yes
alembic -c "$config_file" current -v
)
install_kallithea "$temp/to" "$to_rev_hash"
(
cd "$temp/to"
. "$temp/to-env/bin/activate"
announce "Commencing database upgrade from shown Alembic revision to head..."
alembic -c "$config_file" current -v
alembic -c "$config_file" upgrade head
announce "Upgrade complete, now at the shown Alembic revision:"
alembic -c "$config_file" current -v
)
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