IBC Fraction for trust level changed to uints (#7892)

* fraction uses uint now

* Update proto/ibc/lightclients/tendermint/v1/tendermint.proto

Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>

proto/ibc/lightclients/tendermint/v1/tendermint.proto

@@ -106,8 +106,8 @@ message Header {
   .tendermint.types.ValidatorSet trusted_validators = 4 [(gogoproto.moretags) = "yaml:\"trusted_validators\""];
 }
 
-// Fraction defines the protobuf message type for tmmath.Fraction
+// Fraction defines the protobuf message type for tmmath.Fraction that only supports positive values.
 message Fraction {
-  int64 numerator   = 1;
-  int64 denominator = 2;
+  uint64 numerator   = 1;
+  uint64 denominator = 2;
 }

x/ibc/light-clients/07-tendermint/client/cli/tx.go

@@ -290,12 +290,12 @@ func parseFraction(fraction string) (types.Fraction, error) {
 		return types.Fraction{}, fmt.Errorf("fraction must have format 'numerator/denominator' got %s", fraction)
 	}
 
-	numerator, err := strconv.ParseInt(fr[0], 10, 64)
+	numerator, err := strconv.ParseUint(fr[0], 10, 64)
 	if err != nil {
 		return types.Fraction{}, fmt.Errorf("invalid trust-level numerator: %w", err)
 	}
 
-	denominator, err := strconv.ParseInt(fr[1], 10, 64)
+	denominator, err := strconv.ParseUint(fr[1], 10, 64)
 	if err != nil {
 		return types.Fraction{}, fmt.Errorf("invalid trust-level denominator: %w", err)
 	}

x/ibc/light-clients/07-tendermint/types/fraction.go

@@ -11,15 +11,15 @@ var DefaultTrustLevel = NewFractionFromTm(light.DefaultTrustLevel)
 // NewFractionFromTm returns a new Fraction instance from a tmmath.Fraction
 func NewFractionFromTm(f tmmath.Fraction) Fraction {
 	return Fraction{
-		Numerator:   f.Numerator,
-		Denominator: f.Denominator,
+		Numerator:   uint64(f.Numerator),
+		Denominator: uint64(f.Denominator),
 	}
 }
 
 // ToTendermint converts Fraction to tmmath.Fraction
 func (f Fraction) ToTendermint() tmmath.Fraction {
 	return tmmath.Fraction{
-		Numerator:   f.Numerator,
-		Denominator: f.Denominator,
+		Numerator:   int64(f.Numerator),
+		Denominator: int64(f.Denominator),
 	}
 }