improve std timestamp error further

CHANGELOG.md

@@ -8,6 +8,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
 
+## Changed
+
+- Implement `Display` and `Error` for `StdTimestampError` properly.
+- Implement some redundant `Error` suffixes for enum error variants.
+
 # [v0.6.0] 2023-07-06
 
 ## Added

src/time/cds.rs

@@ -514,7 +514,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> TimeProvider<ProvidesDaysLen> {
         days_len: LengthOfDaySegment,
     ) -> Result<SubmillisPrecision, TimestampError> {
         if buf.len() < MIN_CDS_FIELD_LEN {
-            return Err(TimestampError::ByteConversionError(
+            return Err(TimestampError::ByteConversion(
                 ByteConversionError::FromSliceTooSmall(SizeMissmatch {
                     expected: MIN_CDS_FIELD_LEN,
                     found: buf.len(),
@@ -548,7 +548,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> TimeProvider<ProvidesDaysLen> {
         }
         let stamp_len = Self::calc_stamp_len(pfield);
         if buf.len() < stamp_len {
-            return Err(TimestampError::ByteConversionError(
+            return Err(TimestampError::ByteConversion(
                 ByteConversionError::FromSliceTooSmall(SizeMissmatch {
                     expected: stamp_len,
                     found: buf.len(),
@@ -605,7 +605,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> TimeProvider<ProvidesDaysLen> {
 
     fn length_check(&self, buf: &[u8], len_as_bytes: usize) -> Result<(), TimestampError> {
         if buf.len() < len_as_bytes {
-            return Err(TimestampError::ByteConversionError(
+            return Err(TimestampError::ByteConversion(
                 ByteConversionError::ToSliceTooSmall(SizeMissmatch {
                     expected: len_as_bytes,
                     found: buf.len(),
@@ -674,21 +674,21 @@ impl<ProvidesDaysLen: ProvidesDaysLength> TimeProvider<ProvidesDaysLen> {
     fn from_now_generic(days_len: LengthOfDaySegment) -> Result<Self, StdTimestampError> {
         let conversion_from_now = ConversionFromNow::new()?;
         Self::generic_from_conversion(days_len, conversion_from_now)
-            .map_err(StdTimestampError::TimestampError)
+            .map_err(StdTimestampError::Timestamp)
     }
 
     #[cfg(feature = "std")]
     fn from_now_generic_us_prec(days_len: LengthOfDaySegment) -> Result<Self, StdTimestampError> {
         let conversion_from_now = ConversionFromNow::new_with_submillis_us_prec()?;
         Self::generic_from_conversion(days_len, conversion_from_now)
-            .map_err(StdTimestampError::TimestampError)
+            .map_err(StdTimestampError::Timestamp)
     }
 
     #[cfg(feature = "std")]
     fn from_now_generic_ps_prec(days_len: LengthOfDaySegment) -> Result<Self, StdTimestampError> {
         let conversion_from_now = ConversionFromNow::new_with_submillis_ps_prec()?;
         Self::generic_from_conversion(days_len, conversion_from_now)
-            .map_err(StdTimestampError::TimestampError)
+            .map_err(StdTimestampError::Timestamp)
     }
 
     fn generic_from_conversion<C: CdsConverter>(
@@ -697,7 +697,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> TimeProvider<ProvidesDaysLen> {
     ) -> Result<Self, TimestampError> {
         let ccsds_days: ProvidesDaysLen::FieldType =
             converter.ccsds_days_as_u32().try_into().map_err(|_| {
-                TimestampError::CdsError(CdsError::InvalidCcsdsDays(
+                TimestampError::Cds(CdsError::InvalidCcsdsDays(
                     converter.ccsds_days_as_u32().into(),
                 ))
             })?;
@@ -753,7 +753,7 @@ impl<ProvidesDaysLen: ProvidesDaysLength> TimeProvider<ProvidesDaysLen> {
             .ccsds_days
             .try_into()
             .map_err(|_| {
-                StdTimestampError::TimestampError(
+                StdTimestampError::Timestamp(
                     CdsError::InvalidCcsdsDays(
                         conversion_from_now.unix_conversion.ccsds_days as i64,
                     )
@@ -791,7 +791,7 @@ impl TimeProvider<DaysLen24Bits> {
     /// ## Errors
     ///
     /// This function will return [TimestampError::DateBeforeCcsdsEpoch] or
-    /// [TimestampError::CdsError] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
+    /// [TimestampError::Cds] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
     /// or the CCSDS days value exceeds the allowed bit width (24 bits).
     pub fn from_dt_with_u24_days(dt: &DateTime<Utc>) -> Result<Self, TimestampError> {
         Self::from_dt_generic(dt, LengthOfDaySegment::Long24Bits)
@@ -802,7 +802,7 @@ impl TimeProvider<DaysLen24Bits> {
     /// ## Errors
     ///
     /// This function will return [TimestampError::DateBeforeCcsdsEpoch] or
-    /// [TimestampError::CdsError] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
+    /// [TimestampError::Cds] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
     /// or the CCSDS days value exceeds the allowed bit width (24 bits).
     pub fn from_unix_secs_with_u24_days(
         unix_stamp: &UnixTimestamp,
@@ -867,7 +867,7 @@ impl TimeProvider<DaysLen16Bits> {
     /// Create a provider from a [`DateTime<Utc>`] struct.
     ///
     /// This function will return a [TimestampError::DateBeforeCcsdsEpoch] or a
-    /// [TimestampError::CdsError] if the time is before the CCSDS epoch (01-01-1958 00:00:00) or
+    /// [TimestampError::Cds] if the time is before the CCSDS epoch (01-01-1958 00:00:00) or
     /// the CCSDS days value exceeds the allowed bit width (16 bits).
     pub fn from_dt_with_u16_days(dt: &DateTime<Utc>) -> Result<Self, TimestampError> {
         Self::from_dt_generic(dt, LengthOfDaySegment::Short16Bits)
@@ -885,7 +885,7 @@ impl TimeProvider<DaysLen16Bits> {
     /// ## Errors
     ///
     /// This function will return [TimestampError::DateBeforeCcsdsEpoch] or
-    /// [TimestampError::CdsError] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
+    /// [TimestampError::Cds] if the time is before the CCSDS epoch (1958-01-01T00:00:00+00:00)
     /// or the CCSDS days value exceeds the allowed bit width (24 bits).
     pub fn from_unix_secs_with_u16_days(
         unix_stamp: &UnixTimestamp,
@@ -1305,7 +1305,7 @@ impl TryFrom<TimeProvider<DaysLen24Bits>> for TimeProvider<DaysLen16Bits> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::time::TimestampError::{ByteConversionError, InvalidTimeCode};
+    use crate::time::TimestampError::{ByteConversion, InvalidTimeCode};
     use crate::ByteConversionError::{FromSliceTooSmall, ToSliceTooSmall};
     use chrono::{Datelike, NaiveDate, Timelike};
     #[cfg(feature = "serde")]
@@ -1403,8 +1403,7 @@ mod tests {
         let faulty_ctor = TimeProvider::<DaysLen16Bits>::from_bytes(&buf);
         assert!(faulty_ctor.is_err());
         let error = faulty_ctor.unwrap_err();
-        if let TimestampError::CdsError(CdsError::InvalidCtorForDaysOfLenInPreamble(len_of_day)) =
-            error
+        if let TimestampError::Cds(CdsError::InvalidCtorForDaysOfLenInPreamble(len_of_day)) = error
         {
             assert_eq!(len_of_day, LengthOfDaySegment::Long24Bits);
         } else {
@@ -1449,7 +1448,7 @@ mod tests {
             let res = time_stamper.write_to_bytes(&mut buf[0..i]);
             assert!(res.is_err());
             match res.unwrap_err() {
-                ByteConversionError(ToSliceTooSmall(missmatch)) => {
+                ByteConversion(ToSliceTooSmall(missmatch)) => {
                     assert_eq!(missmatch.found, i);
                     assert_eq!(missmatch.expected, 7);
                 }
@@ -1469,7 +1468,7 @@ mod tests {
             assert!(res.is_err());
             let err = res.unwrap_err();
             match err {
-                ByteConversionError(e) => match e {
+                ByteConversion(e) => match e {
                     FromSliceTooSmall(missmatch) => {
                         assert_eq!(missmatch.found, i);
                         assert_eq!(missmatch.expected, 7);
@@ -1946,7 +1945,7 @@ mod tests {
                 panic!("creation should not succeed")
             }
             Err(e) => {
-                if let TimestampError::CdsError(CdsError::InvalidCcsdsDays(days)) = e {
+                if let TimestampError::Cds(CdsError::InvalidCcsdsDays(days)) = e {
                     assert_eq!(
                         days,
                         unix_to_ccsds_days(invalid_unix_secs / SECONDS_PER_DAY as i64)

src/time/cuc.rs

@@ -245,7 +245,7 @@ impl TimeProviderCcsdsEpoch {
         let fractions =
             fractional_part_from_subsec_ns(fraction_resolution, now.subsec_nanos() as u64);
         Self::new_with_fractions(ccsds_epoch as u32, fractions.unwrap())
-            .map_err(|e| StdTimestampError::TimestampError(e.into()))
+            .map_err(|e| StdTimestampError::Timestamp(e.into()))
     }
 
     /// Updates the current time stamp from the current time. The fractional field width remains
@@ -454,7 +454,7 @@ impl TimeReader for TimeProviderCcsdsEpoch {
         Self: Sized,
     {
         if buf.len() < MIN_CUC_LEN {
-            return Err(TimestampError::ByteConversionError(
+            return Err(TimestampError::ByteConversion(
                 ByteConversionError::FromSliceTooSmall(SizeMissmatch {
                     expected: MIN_CUC_LEN,
                     found: buf.len(),
@@ -480,7 +480,7 @@ impl TimeReader for TimeProviderCcsdsEpoch {
         let (cntr_len, fractions_len, total_len) =
             Self::len_components_and_total_from_pfield(buf[0]);
         if buf.len() < total_len {
-            return Err(TimestampError::ByteConversionError(
+            return Err(TimestampError::ByteConversion(
                 ByteConversionError::FromSliceTooSmall(SizeMissmatch {
                     expected: total_len,
                     found: buf.len(),
@@ -536,7 +536,7 @@ impl TimeWriter for TimeProviderCcsdsEpoch {
     fn write_to_bytes(&self, bytes: &mut [u8]) -> Result<usize, TimestampError> {
         // Cross check the sizes of the counters against byte widths in the ctor
         if bytes.len() < self.len_as_bytes() {
-            return Err(TimestampError::ByteConversionError(
+            return Err(TimestampError::ByteConversion(
                 ByteConversionError::ToSliceTooSmall(SizeMissmatch {
                     found: bytes.len(),
                     expected: self.len_as_bytes(),
@@ -798,9 +798,7 @@ mod tests {
             let res = TimeProviderCcsdsEpoch::from_bytes(&buf[0..i]);
             assert!(res.is_err());
             let err = res.unwrap_err();
-            if let TimestampError::ByteConversionError(ByteConversionError::FromSliceTooSmall(e)) =
-                err
-            {
+            if let TimestampError::ByteConversion(ByteConversionError::FromSliceTooSmall(e)) = err {
                 assert_eq!(e.found, i);
                 assert_eq!(e.expected, 2);
             }
@@ -811,9 +809,7 @@ mod tests {
             let res = TimeProviderCcsdsEpoch::from_bytes(&buf[0..i]);
             assert!(res.is_err());
             let err = res.unwrap_err();
-            if let TimestampError::ByteConversionError(ByteConversionError::FromSliceTooSmall(e)) =
-                err
-            {
+            if let TimestampError::ByteConversion(ByteConversionError::FromSliceTooSmall(e)) = err {
                 assert_eq!(e.found, i);
                 assert_eq!(e.expected, large_stamp.len_as_bytes());
             }
@@ -887,9 +883,7 @@ mod tests {
             let err = cuc.write_to_bytes(&mut buf[0..i]);
             assert!(err.is_err());
             let err = err.unwrap_err();
-            if let TimestampError::ByteConversionError(ByteConversionError::ToSliceTooSmall(e)) =
-                err
-            {
+            if let TimestampError::ByteConversion(ByteConversionError::ToSliceTooSmall(e)) = err {
                 assert_eq!(e.expected, cuc.len_as_bytes());
                 assert_eq!(e.found, i);
             } else {

src/time/mod.rs

@@ -64,9 +64,9 @@ pub enum TimestampError {
     /// Contains tuple where first value is the expected time code and the second
     /// value is the found raw value
     InvalidTimeCode(CcsdsTimeCodes, u8),
-    ByteConversionError(ByteConversionError),
-    CdsError(cds::CdsError),
-    CucError(cuc::CucError),
+    ByteConversion(ByteConversionError),
+    Cds(cds::CdsError),
+    Cuc(cuc::CucError),
     DateBeforeCcsdsEpoch(DateTime<Utc>),
     CustomEpochNotSupported,
 }
@@ -80,13 +80,13 @@ impl Display for TimestampError {
                     "invalid raw time code value {raw_val} for time code {time_code:?}"
                 )
             }
-            TimestampError::CdsError(e) => {
+            TimestampError::Cds(e) => {
                 write!(f, "cds error {e}")
             }
-            TimestampError::CucError(e) => {
+            TimestampError::Cuc(e) => {
                 write!(f, "cuc error {e}")
             }
-            TimestampError::ByteConversionError(e) => {
+            TimestampError::ByteConversion(e) => {
                 write!(f, "byte conversion error {e}")
             }
             TimestampError::DateBeforeCcsdsEpoch(e) => {
@@ -103,22 +103,22 @@ impl Display for TimestampError {
 impl Error for TimestampError {
     fn source(&self) -> Option<&(dyn Error + 'static)> {
         match self {
-            TimestampError::ByteConversionError(e) => Some(e),
-            TimestampError::CdsError(e) => Some(e),
-            TimestampError::CucError(e) => Some(e),
+            TimestampError::ByteConversion(e) => Some(e),
+            TimestampError::Cds(e) => Some(e),
+            TimestampError::Cuc(e) => Some(e),
             _ => None,
         }
     }
 }
 impl From<cds::CdsError> for TimestampError {
     fn from(e: cds::CdsError) -> Self {
-        TimestampError::CdsError(e)
+        TimestampError::Cds(e)
     }
 }
 
 impl From<cuc::CucError> for TimestampError {
     fn from(e: cuc::CucError) -> Self {
-        TimestampError::CucError(e)
+        TimestampError::Cuc(e)
     }
 }
 
@@ -132,9 +132,9 @@ pub mod std_mod {
     #[derive(Debug, Clone, Error)]
     pub enum StdTimestampError {
         #[error("system time error: {0}")]
-        SystemTimeError(#[from] SystemTimeError),
+        SystemTime(#[from] SystemTimeError),
         #[error("timestamp error: {0}")]
-        TimestampError(#[from] TimestampError),
+        Timestamp(#[from] TimestampError),
     }
 }