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server/email_notifications: do not panic on template registration

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instead print an error and continue, the rendering functions will error
out if one of the templates could not be registered

if we `.unwrap()` here, it can lead to problems if the templates are
not correct, i.e. we could panic while holding a lock, if something holds
a mutex while this is called for the first time

add a test to catch registration issues during package build

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2021-03-18 13:01:05 +01:00 committed by Dietmar Maurer
parent 2729d134bd
commit 25b4d52dce
1 changed files with 42 additions and 13 deletions
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55
src/server/email_notifications.rs
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@ -1,10 +1,11 @@
use anyhow::Error;
use serde_json::json;
use handlebars::{Handlebars, Helper, Context, RenderError, RenderContext, Output, HelperResult};
use handlebars::{Handlebars, Helper, Context, RenderError, RenderContext, Output, HelperResult, TemplateError};
use proxmox::tools::email::sendmail;
use proxmox::api::schema::parse_property_string;
use proxmox::try_block;
use crate::{
config::datastore::DataStoreConfig,
@ -181,25 +182,33 @@ lazy_static::lazy_static!{
static ref HANDLEBARS: Handlebars<'static> = {
let mut hb = Handlebars::new();
let result: Result<(), TemplateError> = try_block!({
hb.set_strict_mode(true);
hb.set_strict_mode(true);
hb.register_helper("human-bytes", Box::new(handlebars_humam_bytes_helper));
hb.register_helper("relative-percentage", Box::new(handlebars_relative_percentage_helper));
hb.register_helper("human-bytes", Box::new(handlebars_humam_bytes_helper));
hb.register_helper("relative-percentage", Box::new(handlebars_relative_percentage_helper));
hb.register_template_string("gc_ok_template", GC_OK_TEMPLATE).unwrap();
hb.register_template_string("gc_err_template", GC_ERR_TEMPLATE).unwrap();
hb.register_template_string("gc_ok_template", GC_OK_TEMPLATE)?;
hb.register_template_string("gc_err_template", GC_ERR_TEMPLATE)?;
hb.register_template_string("verify_ok_template", VERIFY_OK_TEMPLATE).unwrap();
hb.register_template_string("verify_err_template", VERIFY_ERR_TEMPLATE).unwrap();
hb.register_template_string("verify_ok_template", VERIFY_OK_TEMPLATE)?;
hb.register_template_string("verify_err_template", VERIFY_ERR_TEMPLATE)?;
hb.register_template_string("sync_ok_template", SYNC_OK_TEMPLATE).unwrap();
hb.register_template_string("sync_err_template", SYNC_ERR_TEMPLATE).unwrap();
hb.register_template_string("sync_ok_template", SYNC_OK_TEMPLATE)?;
hb.register_template_string("sync_err_template", SYNC_ERR_TEMPLATE)?;
hb.register_template_string("tape_backup_ok_template", TAPE_BACKUP_OK_TEMPLATE).unwrap();
hb.register_template_string("tape_backup_err_template", TAPE_BACKUP_ERR_TEMPLATE).unwrap();
hb.register_template_string("tape_backup_ok_template", TAPE_BACKUP_OK_TEMPLATE)?;
hb.register_template_string("tape_backup_err_template", TAPE_BACKUP_ERR_TEMPLATE)?;
hb.register_template_string("package_update_template", PACKAGE_UPDATES_TEMPLATE).unwrap();
hb.register_template_string("package_update_template", PACKAGE_UPDATES_TEMPLATE)?;
Ok(())
});
if let Err(err) = result {
eprintln!("error during template registration: {}", err);
}
hb
};
@ -600,3 +609,23 @@ fn handlebars_relative_percentage_helper(
}
Ok(())
}
#[test]
fn test_template_register() {
HANDLEBARS.get_helper("human-bytes").unwrap();
HANDLEBARS.get_helper("relative-percentage").unwrap();
assert!(HANDLEBARS.has_template("gc_ok_template"));
assert!(HANDLEBARS.has_template("gc_err_template"));
assert!(HANDLEBARS.has_template("verify_ok_template"));
assert!(HANDLEBARS.has_template("verify_err_template"));
assert!(HANDLEBARS.has_template("sync_ok_template"));
assert!(HANDLEBARS.has_template("sync_err_template"));
assert!(HANDLEBARS.has_template("tape_backup_ok_template"));
assert!(HANDLEBARS.has_template("tape_backup_err_template"));
assert!(HANDLEBARS.has_template("package_update_template"));
}