cargo: chrono-03 can be supported

In this commit we introduce a version 0.3 of chrono crate just to show
that newer version of chrono (0.5) can be supported in the future.

Note: this commit is just a placeholder. Most of the code is left as
todo - this should not be merged.

scylla-cql/Cargo.toml

@@ -22,6 +22,7 @@ thiserror = "1.0"
 num-bigint-03 = { package = "num-bigint", version = "0.3", optional = true }
 num-bigint-04 = { package = "num-bigint", version = "0.4", optional = true }
 bigdecimal-04 = { package = "bigdecimal", version = "0.4", optional = true }
+chrono-03 = { package = "chrono", version = "0.3", default-features = false, optional = true }
 chrono-04 = { package = "chrono", version = "0.4.32", default-features = false, optional = true }
 lz4_flex = { version = "0.11.1" }
 async-trait = "0.1.57"
@@ -44,11 +45,13 @@ harness = false
 secrecy-08 = ["dep:secrecy-08"]
 time-02 = ["dep:time-02"]
 time-03 = ["dep:time-03"]
+chrono-03 = ["dep:chrono-03"]
 chrono-04 = ["dep:chrono-04"]
 num-bigint-03 = ["dep:num-bigint-03"]
 num-bigint-04 = ["dep:num-bigint-04"]
 bigdecimal-04 = ["dep:bigdecimal-04"]
 full-serialization = [
+    "chrono-03",
     "chrono-04",
     "time-02",
     "time-03",

scylla-cql/src/frame/response/cql_to_rust.rs

@@ -175,6 +175,16 @@ impl FromCqlVal<CqlValue> for bigdecimal_04::BigDecimal {
     }
 }
 
+#[cfg(feature = "chrono-03")]
+impl FromCqlVal<CqlValue> for chrono_03::NaiveDate {
+    fn from_cql(cql_val: CqlValue) -> Result<Self, FromCqlValError> {
+        match cql_val {
+            CqlValue::Date(cql_date) => cql_date.try_into().map_err(|_| FromCqlValError::BadVal),
+            _ => Err(FromCqlValError::BadCqlType),
+        }
+    }
+}
+
 #[cfg(feature = "chrono-04")]
 impl FromCqlVal<CqlValue> for chrono_04::NaiveDate {
     fn from_cql(cql_val: CqlValue) -> Result<Self, FromCqlValError> {
@@ -205,6 +215,16 @@ impl FromCqlVal<CqlValue> for time_03::Date {
     }
 }
 
+#[cfg(feature = "chrono-03")]
+impl FromCqlVal<CqlValue> for chrono_03::NaiveTime {
+    fn from_cql(cql_val: CqlValue) -> Result<Self, FromCqlValError> {
+        match cql_val {
+            CqlValue::Time(cql_time) => cql_time.try_into().map_err(|_| FromCqlValError::BadVal),
+            _ => Err(FromCqlValError::BadCqlType),
+        }
+    }
+}
+
 #[cfg(feature = "chrono-04")]
 impl FromCqlVal<CqlValue> for chrono_04::NaiveTime {
     fn from_cql(cql_val: CqlValue) -> Result<Self, FromCqlValError> {
@@ -235,6 +255,17 @@ impl FromCqlVal<CqlValue> for time_03::Time {
     }
 }
 
+#[cfg(feature = "chrono-03")]
+impl FromCqlVal<CqlValue> for chrono_03::DateTime<chrono_03::UTC> {
+    fn from_cql(cql_val: CqlValue) -> Result<Self, FromCqlValError> {
+        cql_val
+            .as_cql_timestamp()
+            .ok_or(FromCqlValError::BadCqlType)?
+            .try_into()
+            .map_err(|_| FromCqlValError::BadVal)
+    }
+}
+
 #[cfg(feature = "chrono-04")]
 impl FromCqlVal<CqlValue> for chrono_04::DateTime<chrono_04::Utc> {
     fn from_cql(cql_val: CqlValue) -> Result<Self, FromCqlValError> {
@@ -554,6 +585,36 @@ mod tests {
         assert_eq!(Ok(counter), Counter::from_cql(CqlValue::Counter(counter)));
     }
 
+    #[cfg(feature = "chrono-03")]
+    #[test]
+    fn naive_date_03_from_cql() {
+        use chrono_03::NaiveDate;
+
+        let unix_epoch: CqlValue = CqlValue::Date(CqlDate(2_u32.pow(31)));
+        assert_eq!(
+            Ok(NaiveDate::from_ymd_opt(1970, 1, 1).unwrap()),
+            NaiveDate::from_cql(unix_epoch)
+        );
+
+        let before_epoch: CqlValue = CqlValue::Date(CqlDate(2_u32.pow(31) - 30));
+        assert_eq!(
+            Ok(NaiveDate::from_ymd_opt(1969, 12, 2).unwrap()),
+            NaiveDate::from_cql(before_epoch)
+        );
+
+        let after_epoch: CqlValue = CqlValue::Date(CqlDate(2_u32.pow(31) + 30));
+        assert_eq!(
+            Ok(NaiveDate::from_ymd_opt(1970, 1, 31).unwrap()),
+            NaiveDate::from_cql(after_epoch)
+        );
+
+        let min_date: CqlValue = CqlValue::Date(CqlDate(0));
+        assert!(NaiveDate::from_cql(min_date).is_err());
+
+        let max_date: CqlValue = CqlValue::Date(CqlDate(u32::MAX));
+        assert!(NaiveDate::from_cql(max_date).is_err());
+    }
+
     #[cfg(feature = "chrono-04")]
     #[test]
     fn naive_date_04_from_cql() {
@@ -662,6 +723,50 @@ mod tests {
         assert_eq!(time_ns, CqlTime::from_cql(cql_value).unwrap().0);
     }
 
+    #[cfg(feature = "chrono-03")]
+    #[test]
+    fn naive_time_03_from_cql() {
+        use chrono_03::NaiveTime;
+
+        // Midnight
+        let midnight = CqlValue::Time(CqlTime(0));
+        assert_eq!(
+            Ok(NaiveTime::from_hms(0, 0, 0)),
+            NaiveTime::from_cql(midnight)
+        );
+
+        // 7:15:21.123456789
+        let morning = CqlValue::Time(CqlTime(
+            (7 * 3600 + 15 * 60 + 21) * 1_000_000_000 + 123_456_789,
+        ));
+        assert_eq!(
+            Ok(NaiveTime::from_hms_nano_opt(7, 15, 21, 123_456_789).unwrap()),
+            NaiveTime::from_cql(morning)
+        );
+
+        // 23:59:59.999999999
+        let late_night = CqlValue::Time(CqlTime(
+            (23 * 3600 + 59 * 60 + 59) * 1_000_000_000 + 999_999_999,
+        ));
+        assert_eq!(
+            Ok(NaiveTime::from_hms_nano_opt(23, 59, 59, 999_999_999).unwrap()),
+            NaiveTime::from_cql(late_night)
+        );
+
+        // Bad values. Since value is out of `chrono_04::NaiveTime` range, it should return `BadVal` error
+        let bad_time1 = CqlValue::Time(CqlTime(-1));
+        assert_eq!(Err(FromCqlValError::BadVal), NaiveTime::from_cql(bad_time1));
+        let bad_time2 = CqlValue::Time(CqlTime(i64::MAX));
+        assert_eq!(Err(FromCqlValError::BadVal), NaiveTime::from_cql(bad_time2));
+
+        // Different CQL type. Since value can't be casted, it should return `BadCqlType` error
+        let bad_type = CqlValue::Double(0.5);
+        assert_eq!(
+            Err(FromCqlValError::BadCqlType),
+            NaiveTime::from_cql(bad_type)
+        );
+    }
+
     #[cfg(feature = "chrono-04")]
     #[test]
     fn naive_time_04_from_cql() {
@@ -762,6 +867,25 @@ mod tests {
         );
     }
 
+    #[cfg(feature = "chrono-03")]
+    #[test]
+    fn datetime_03_from_cql() {
+        use chrono_03::{DateTime, NaiveDate, UTC};
+        let naivedatetime_utc = NaiveDate::from_ymd_opt(2022, 12, 31)
+            .unwrap()
+            .and_hms_opt(2, 0, 0)
+            .unwrap();
+        let datetime_utc = DateTime::<UTC>::from_utc(naivedatetime_utc, UTC);
+
+        assert_eq!(
+            datetime_utc,
+            DateTime::<UTC>::from_cql(CqlValue::Timestamp(CqlTimestamp(
+                datetime_utc.timestamp() * 1000 + datetime_utc.timestamp_subsec_millis() as i64
+            )))
+            .unwrap()
+        );
+    }
+
     #[cfg(feature = "chrono-04")]
     #[test]
     fn datetime_04_from_cql() {