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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
//! Helper macros for implementing the FFI API for metric types.
/// Get a metric object by ID from the corresponding map, then
/// execute the provided closure with it.
///
/// # Arguments
///
/// * `$map` - The name of the hash map within `metrics::__glean_metric_maps`
/// (or `factory::__jog_metric_maps`)
/// as generated by glean_parser.
/// * `$id` - The ID of the metric to get.
/// * `$m` - The identifier to use for the retrieved metric.
/// The expression `$f` can use this identifier.
/// * `$f` - The expression to execute with the retrieved metric `$m`.
macro_rules! with_metric {
(BOOLEAN_MAP, $id:ident, $m:ident, $f:expr) => {
maybe_labeled_with_metric!(BOOLEAN_MAP, $id, $m, $f)
};
(COUNTER_MAP, $id:ident, $m:ident, $f:expr) => {
maybe_labeled_with_metric!(COUNTER_MAP, $id, $m, $f)
};
(STRING_MAP, $id:ident, $m:ident, $f:expr) => {
maybe_labeled_with_metric!(STRING_MAP, $id, $m, $f)
};
($map:ident, $id:ident, $m:ident, $f:expr) => {
just_with_metric!($map, $id, $m, $f)
};
}
/// Get a metric object by id from the corresponding map, then
/// execute the provided closure with it.
///
/// Ignores the possibility that the $id might be for a labeled submetric.
///
/// # Arguments
///
/// * `$map` - The name of the hash map within `metrics::__glean_metric_maps`
/// (or `factory::__jog_metric_maps`)
/// as generated by glean_parser.
/// * `$id` - The ID of the metric to get.
/// * `$m` - The identifier to use for the retrieved metric.
/// The expression `$f` can use this identifier.
/// * `$f` - The expression to execute with the retrieved metric `$m`.
macro_rules! just_with_metric {
($map:ident, $id:ident, $m:ident, $f:expr) => {
if $id & (1 << $crate::factory::DYNAMIC_METRIC_BIT) > 0 {
let map = $crate::factory::__jog_metric_maps::$map
.read()
.expect("Read lock for dynamic metric map was poisoned");
match map.get(&$id.into()) {
Some($m) => $f,
None => panic!("No (dynamic) metric for id {}", $id),
}
} else {
match $crate::metrics::__glean_metric_maps::$map.get(&$id.into()) {
Some($m) => $f,
None => panic!("No metric for id {}", $id),
}
}
};
}
/// Get a metric object by id from the corresponding map, then
/// execute the provided closure with it.
///
/// Requires that the provided $map be of a type that can be labeled, since it
/// assumes the presence of a same-named map in
/// `metrics::_glean_metrics_map::submetric_maps`.
///
/// # Arguments
///
/// * `$map` - The name of the hash map within `metrics::__glean_metric_maps`
/// and `metrics::__glean_metric_maps::submetric_maps` as generated
/// by glean_parser.
/// * `$id` - The ID of the metric to get.
/// * `$m` - The identifier to use for the retrieved metric.
/// The expression `$f` can use this identifier.
/// * `$f` - The expression to execute with the retrieved metric `$m`.
macro_rules! maybe_labeled_with_metric {
($map:ident, $id:ident, $m:ident, $f:expr) => {
if $id & (1 << $crate::metrics::__glean_metric_maps::submetric_maps::SUBMETRIC_BIT) > 0 {
let map = $crate::metrics::__glean_metric_maps::submetric_maps::$map
.read()
.expect("Read lock for labeled metric map was poisoned");
match map.get(&$id.into()) {
Some($m) => $f,
None => panic!("No submetric for id {}", $id),
}
} else {
just_with_metric!($map, $id, $m, $f)
}
};
}
/// Test whether a value is stored for the given metric.
///
/// # Arguments
///
/// * `$metric` - The metric to test.
/// * `$storage` - the storage name to look into.
macro_rules! test_has {
($metric:ident, $storage:ident) => {{
let storage = if $storage.is_empty() {
None
} else {
Some($storage.to_utf8())
};
$metric.test_get_value(storage.as_deref()).is_some()
}};
}
/// Get the currently stored value for the given metric.
///
/// # Arguments
///
/// * `$metric` - The metric to test.
/// * `$storage` - the storage name to look into.
macro_rules! test_get {
($metric:ident, $storage:ident) => {{
let storage = if $storage.is_empty() {
None
} else {
Some($storage.to_utf8())
};
$metric.test_get_value(storage.as_deref()).unwrap()
}};
}
/// Check the provided metric in the provided storage for errors.
/// On finding one, return an error string.
///
/// # Arguments
///
/// * `$metric` - The metric to test.
macro_rules! test_get_errors {
($metric:path) => {{
let error_types = [
glean::ErrorType::InvalidValue,
glean::ErrorType::InvalidLabel,
glean::ErrorType::InvalidState,
glean::ErrorType::InvalidOverflow,
];
let mut error_str = None;
for &error_type in error_types.iter() {
let num_errors = $metric.test_get_num_recorded_errors(error_type);
if num_errors > 0 {
error_str = Some(format!(
"Metric had {} error(s) of type {}!",
num_errors,
error_type.as_str()
));
break;
}
}
error_str
}};
}
/// Get the submetric id for a given labeled metric and label.
///
/// # Arguments
///
/// * `$id` - The id of the labeled metric.
/// * `$label` - The label of the submetric.
/// * `$labeled_map` - The name of the labeled metric's map for retrieval.
/// * `$submetric_map`- The name of the submetrics' map for storage.
/// * `$metric_type` - The submetric's type (needed for an internal closure).
macro_rules! labeled_submetric_get {
($id:ident, $label:ident, $labeled_map:ident, $submetric_map:ident, $metric_type:ty) => {{
let tuple = ($id, $label.to_utf8().into());
{
let map = $crate::metrics::__glean_metric_maps::submetric_maps::LABELED_METRICS_TO_IDS
.read()
.expect("read lock of submetric ids was poisoned");
if let Some(submetric_id) = map.get(&tuple) {
return *submetric_id;
}
}
// Gotta actually create a new submetric with a new id.
let submetric_id =
$crate::metrics::__glean_metric_maps::submetric_maps::NEXT_LABELED_SUBMETRIC_ID
.fetch_add(1, Ordering::SeqCst);
{
with_metric!($labeled_map, $id, metric, {
let submetric = metric.get(&tuple.1);
let mut map = $crate::metrics::__glean_metric_maps::submetric_maps::$submetric_map
.write()
.expect("write lock of submetric map was poisoned");
map.insert(submetric_id.into(), submetric);
});
}
let mut map = $crate::metrics::__glean_metric_maps::submetric_maps::LABELED_METRICS_TO_IDS
.write()
.expect("write lock of submetric ids was poisoned");
map.insert(tuple, submetric_id);
submetric_id
}};
}
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