j2f5 is a customization for j2cli, which again is a command line tool to template any kind of text based files using python's famous jinja2.
j2f5 focuses on F5 related code (specifically iRules), but isn't limited to it. It is supposed to be a relatively lightweight addition to j2cli.
- adds ansible filters (when ansible is available)
- supports custom jinja2 delimiters
- sane formatting defaults
Copy and run this example:
cat <<EOF > configuration.yaml
# configuration.yaml
error:
heading: "Sorry :-("
message: "Sorry, we can't serve your request right now."
include_id: true
EOF
cat <<'EOF' > lb_sorry_page.irule.j2
# lb_sorry_page.irule.j2
when LB_FAILED {
{# generate unique error_id and log when error.include_id is true #}
{% if error.include_id %}
set error_id [lindex [AES::key 128] 2]
log local0.error "LB failed for [FLOW::this], error_id:$error_id"
{% endif %}
HTTP::respond 503 content "<html><body>
<h1>{{error.heading}}</h1>
<p>{{error.message}}</p>
{% if error.include_id %}
<p>error_id: $error_id</p>
{% endif %}
</body></html>" Connection Close
}
EOF
j2 --customize j2f5.py lb_sorry_page.irule.j2 configuration.yaml \
-o lb_sorry_page.irule
cat lb_sorry_page.iruleWill produce:
# lb_sorry_page.irule.j2
when LB_FAILED {
set error_id [lindex [AES::key 128] 2]
log local0.error "LB failed for [FLOW::this], error_id:$error_id"
HTTP::respond 503 content "<html><body>
<h1>Sorry :-(</h1>
<p>Sorry, we can't serve your request right now.</p>
<p>error_id: $error_id</p>
</body></html>" Connection Close
}In configuration.yaml set:
include_id: falseRun:
j2 --customize j2f5.py lb_sorry_page.irule.j2 configuration.yaml \
-o lb_sorry_page.irule
cat lb_sorry_page.iruleAnd observe the result:
# lb_sorry_page.irule.j2
when LB_FAILED {
HTTP::respond 503 content "<html><body>
<h1>Sorry :-(</h1>
<p>Sorry, we can't serve your request right now.</p>
</body></html>" Connection Close
}