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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
use inherent::inherent;
use std::sync::Arc;
use super::{CommonMetricData, MetricId};
use crate::ipc::need_ipc;
/// A text metric.
///
/// Record a string value with arbitrary content. Supports non-ASCII
/// characters.
///
/// # Example
///
/// The following piece of code will be generated by `glean_parser`:
///
/// ```rust,ignore
/// use glean::metrics::{TextMetric, CommonMetricData, Lifetime};
/// use once_cell::sync::Lazy;
///
/// mod browser {
/// pub static bread_recipe: Lazy<TextMetric> = Lazy::new(|| TextMetric::new(CommonMetricData {
/// name: "bread_recipe".into(),
/// category: "browser".into(),
/// lifetime: Lifetime::Ping,
/// disabled: false,
/// dynamic_label: None
/// }));
/// }
/// ```
///
/// It can then be used with:
///
/// ```rust,ignore
/// browser::bread_recipe.set("The 'baguette de tradition française' is made from wheat flour, water, yeast, and common salt. It may contain up to 2% broad bean flour, up to 0.5% soya flour, and up to 0.3% wheat malt flour.");
/// ```
#[derive(Clone)]
pub enum TextMetric {
Parent(Arc<glean::private::TextMetric>),
Child(TextMetricIpc),
}
#[derive(Clone, Debug)]
pub struct TextMetricIpc;
impl TextMetric {
/// Create a new text metric.
pub fn new(_id: MetricId, meta: CommonMetricData) -> Self {
if need_ipc() {
TextMetric::Child(TextMetricIpc)
} else {
TextMetric::Parent(Arc::new(glean::private::TextMetric::new(meta)))
}
}
#[cfg(test)]
pub(crate) fn child_metric(&self) -> Self {
match self {
TextMetric::Parent(_) => TextMetric::Child(TextMetricIpc),
TextMetric::Child(_) => panic!("Can't get a child metric from a child process"),
}
}
}
#[inherent]
impl glean::traits::Text for TextMetric {
/// Sets to the specified value.
///
/// # Arguments
///
/// * `value` - The text to set the metric to.
pub fn set<S: Into<std::string::String>>(&self, value: S) {
match self {
TextMetric::Parent(p) => {
p.set(value.into());
}
TextMetric::Child(_) => {
log::error!("Unable to set text metric in non-main process. This operation will be ignored.");
// If we're in automation we can panic so the instrumentor knows they've gone wrong.
// This is a deliberate violation of Glean's "metric APIs must not throw" design.
assert!(!crate::ipc::is_in_automation(), "Attempted to set text metric in non-main process, which is forbidden. This panics in automation.");
}
}
}
/// **Exported for test purposes.**
///
/// Gets the currently stored value as a string.
///
/// This doesn't clear the stored value.
///
/// # Arguments
///
/// * `ping_name` - represents the optional name of the ping to retrieve the
/// metric for. Defaults to the first value in `send_in_pings`.
pub fn test_get_value<'a, S: Into<Option<&'a str>>>(
&self,
ping_name: S,
) -> Option<std::string::String> {
let ping_name = ping_name.into().map(|s| s.to_string());
match self {
TextMetric::Parent(p) => p.test_get_value(ping_name),
TextMetric::Child(_) => {
panic!("Cannot get test value for text metric in non-main process!")
}
}
}
/// **Exported for test purposes.**
///
/// Gets the number of recorded errors for the given metric and error type.
///
/// # Arguments
///
/// * `error` - The type of error
/// * `ping_name` - represents the optional name of the ping to retrieve the
/// metric for. Defaults to the first value in `send_in_pings`.
///
/// # Returns
///
/// The number of errors reported.
pub fn test_get_num_recorded_errors(&self, error: glean::ErrorType) -> i32 {
match self {
TextMetric::Parent(p) => p.test_get_num_recorded_errors(error),
TextMetric::Child(_) => panic!(
"Cannot get the number of recorded errors for text metric in non-main process!"
),
}
}
}
#[cfg(test)]
mod test {
use crate::{common_test::*, ipc, metrics};
#[test]
fn sets_text_value() {
let _lock = lock_test();
let metric = &metrics::test_only_ipc::a_text;
metric.set("test_text_value");
assert_eq!("test_text_value", metric.test_get_value("store1").unwrap());
}
#[test]
fn text_ipc() {
// TextMetric doesn't support IPC.
let _lock = lock_test();
let parent_metric = &metrics::test_only_ipc::a_text;
parent_metric.set("test_parent_value");
{
let child_metric = parent_metric.child_metric();
let _raii = ipc::test_set_need_ipc(true);
// Instrumentation calls do not panic.
child_metric.set("test_child_value");
// (They also shouldn't do anything,
// but that's not something we can inspect in this test)
}
assert!(ipc::replay_from_buf(&ipc::take_buf().unwrap()).is_ok());
assert!(
"test_parent_value" == parent_metric.test_get_value("store1").unwrap(),
"Text metrics should only work in the parent process"
);
}
}