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use log::warn;
use serde::{Deserialize, Serialize};
use crate::util::f64_to_i64_safe;
#[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
#[serde(untagged)]
pub enum FlagValue {
Bool(bool),
Str(String),
Number(f64),
Json(serde_json::Value),
}
impl From<bool> for FlagValue {
fn from(b: bool) -> FlagValue {
FlagValue::Bool(b)
}
}
impl From<String> for FlagValue {
fn from(s: String) -> FlagValue {
FlagValue::Str(s)
}
}
impl From<f64> for FlagValue {
fn from(f: f64) -> FlagValue {
FlagValue::Number(f)
}
}
impl From<i64> for FlagValue {
fn from(i: i64) -> FlagValue {
FlagValue::Number(i as f64)
}
}
impl From<serde_json::Value> for FlagValue {
fn from(v: serde_json::Value) -> Self {
use serde_json::Value;
match v {
Value::Bool(b) => b.into(),
Value::Number(n) => {
if let Some(f) = n.as_f64() {
f.into()
} else {
warn!("unrepresentable number {}, converting to string", n);
FlagValue::Json(format!("{}", n).into())
}
}
Value::String(s) => s.into(),
Value::Null | Value::Object(_) | Value::Array(_) => FlagValue::Json(v),
}
}
}
impl FlagValue {
pub fn as_bool(&self) -> Option<bool> {
match self {
FlagValue::Bool(b) => Some(*b),
_ => {
warn!("variation type is not bool but {:?}", self);
None
}
}
}
pub fn as_string(&self) -> Option<String> {
match self {
FlagValue::Str(s) => Some(s.clone()),
_ => {
warn!("variation type is not str but {:?}", self);
None
}
}
}
pub fn as_float(&self) -> Option<f64> {
match self {
FlagValue::Number(f) => Some(*f),
_ => {
warn!("variation type is not number but {:?}", self);
None
}
}
}
pub fn as_int(&self) -> Option<i64> {
match self {
FlagValue::Number(f) => f64_to_i64_safe(*f),
_ => {
warn!("variation type is not number but {:?}", self);
None
}
}
}
pub fn as_json(&self) -> Option<serde_json::Value> {
use serde_json::Value;
match self {
FlagValue::Bool(b) => Some(Value::from(*b)),
FlagValue::Str(s) => Some(Value::from(s.as_str())),
FlagValue::Number(f) => Some(Value::from(*f)),
FlagValue::Json(v) => Some(v.clone()),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use serde_json::json;
use spectral::prelude::*;
#[test]
fn float_bounds() {
let test_cases = vec![
(1.99, Some(1)),
(9007199254740990.0, Some(9007199254740990)),
(9007199254740991.0, Some(9007199254740991)),
(9007199254740992.0, None),
(-1.99, Some(-1)),
(-9007199254740990.0, Some(-9007199254740990)),
(-9007199254740991.0, Some(-9007199254740991)),
(-9007199254740992.0, None),
];
for (have, expect) in test_cases {
assert_that!(FlagValue::Number(have).as_int()).is_equal_to(expect);
}
}
#[test]
fn deserialization() {
fn test_case(json: &str, expected: FlagValue) {
assert_eq!(serde_json::from_str::<FlagValue>(json).unwrap(), expected);
}
test_case("1.0", FlagValue::Number(1.0));
test_case("1", FlagValue::Number(1.0));
test_case("true", FlagValue::Bool(true));
test_case("\"foo\"", FlagValue::Str("foo".to_string()));
test_case("{}", FlagValue::Json(json!({})));
}
}