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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 std::fmt::Display;
use serde::{Deserialize, Serialize};
use serde_json::Value as JsonValue;
/// This type represents all possible errors that can occur when serializing or deserializing an object from/to JSON.
#[derive(Debug)]
pub struct ObjectError(serde_json::Error);
impl Display for ObjectError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
Display::fmt(&self.0, f)
}
}
impl std::error::Error for ObjectError {}
/// An object that can be serialized into JSON.
///
/// Objects are defined by their structure in the metrics definition.
///
/// This is essentially a wrapper around serde's `Serialize`/`Deserialize`,
/// but in a way we can name it for our JSON (de)serialization.
pub trait ObjectSerialize {
/// Deserialize the object from its JSON representation.
///
/// Returns an error if deserialization fails.
/// This should not happen for glean_parser-generated and later serialized objects.
fn from_str(obj: &str) -> Result<Self, ObjectError>
where
Self: Sized;
/// Serialize this object into a JSON string.
fn into_serialized_object(self) -> Result<JsonValue, ObjectError>;
}
impl<V> ObjectSerialize for V
where
V: Serialize,
V: for<'de> Deserialize<'de>,
{
fn from_str(obj: &str) -> Result<Self, ObjectError> {
serde_json::from_str(obj).map_err(ObjectError)
}
fn into_serialized_object(self) -> Result<JsonValue, ObjectError> {
serde_json::to_value(self).map_err(ObjectError)
}
}