FactGrid:Setup

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This page describes the technical setup of the FactGrid website and services. FactGrid currently runs on a single virtual server, and all the file system paths mentioned here refer to that server.

MediaWiki

MediaWiki is installed under /var/www/w/. Apache serves /var/www/ as document root, with the standard MediaWiki short URL setup to rewrite /wiki/ into /w/index.php.

QuickStatements

The git repositories for quickstatements and its dependency magnustools are cloned under /srv/, and symlinks in /var/www/ point into their public_html/ subdirectories. There is an oauth.ini configuration file in /srv/quickstatements/ (for this consumer, with a request modeled after the original Wikidata consumer), and a config.json file in /src/quickstatements/public_html/ describes the URL layout of the FactGrid site and selects FactGrid as the site to use. Logs go to /srv/quickstatements/tool.log, which is owned by the www-data group and group-writable.

The bot has not been set up yet, so “run in background” doesn’t currently work.

Reasonator

The git repository for reasonator is cloned under /srv, and a symlink in /var/www/ points into its public_html/v2/ subdirectory. config.json is copied from config.json.template with some property IDs replaced with their FactGrid equivalent, a few replaced with “TODO”, and most other property IDs completely removed because they don’t apply to FactGrid. There are also minor uncommitted changes in vue.js (avoid CORS errors) and main-page.html (replace example items), though hopefully those should become unnecessary in the future.

Query service

Upstream instructions:

The query service source is cloned in ~factgrid/wikidata-query-rdf/, built using ant as described in the “getting started” document, and unzipped into /srv/wdqs-0.3.1-SNAPSHOT/ (to which /srv/wdqs/ is a symlink). RWStore.properties is edited to adjust the location of the journal file, which we have in /var/lib/wdqs/factgrid.jnl. There is also a nearly-empty mwservices.conf file ({"services":{},"endpoints":[]}) to avoid a warning if that file is missing completely.

The query service itself runs as the blazegraph.service systemd unit (run systemctl cat blazegraph to see the configuration files). Its standard output and error go to the journal, and can be viewed by administrators with journalctl -u blazegraph (add -e for the latest messages).

The updater for the query service, which reads updates from the wiki’s recent changes and applies them to the query service, similarly runs as blazegraph-update.service.

The query service UI is cloned in ~factgrid/wikidata-query-rdf/gui/. It can be built using npm run build, and the resulting build/ directory is then copied into /var/www/, with a symlink /var/www/query pointing to the latest version. A few of the files in the repository have uncommitted changes specific to FactGrid; before updating the GUI, they have to be stashed away.

git stash save &&
git pull &&
git stash pop &&
npm run build &&
now=$(date -Iseconds) &&
cp -a build/ /var/www/query-"$now" &&
ln -sfT query-"$now" /var/www/query # atomically update symlink
# optional: remove the old /var/www/query-* directory