[usage] Use credit cents when computing listed usage balance

Author: easyCZ

components/usage/pkg/apiv1/usage.go

@@ -150,8 +150,8 @@ func (s *UsageService) ListUsage(ctx context.Context, in *v1.ListUsageRequest) (
 
 	return &v1.ListUsageResponse{
 		UsageEntries:         usageData,
-		CreditBalanceAtStart: float64(usageSummary.CreditCentsBalanceAtStart) / 100,
-		CreditBalanceAtEnd:   float64(usageSummary.CreditCentsBalanceAtEnd) / 100,
+		CreditBalanceAtStart: usageSummary.CreditCentsBalanceAtStart.ToCredits(),
+		CreditBalanceAtEnd:   usageSummary.CreditCentsBalanceAtEnd.ToCredits(),
 		Pagination:           &pagination,
 	}, nil
 }

components/usage/pkg/db/cost_center.go

@@ -162,15 +162,15 @@ func (c *CostCenterManager) ComputeInvoiceUsageRecord(ctx context.Context, attri
 	if err != nil {
 		return nil, err
 	}
-	if summary.CreditCentsBalanceAtEnd <= int64(0) {
-		// account has not debt, do nothing
+	if summary.CreditCentsBalanceAtEnd.ToCredits() <= 0 {
+		// account has no debt, do nothing
 		return nil, nil
 	}
 	return &Usage{
 		ID:            uuid.New(),
 		AttributionID: attributionID,
 		Description:   "Credits",
-		CreditCents:   CreditCents(summary.CreditCentsBalanceAtEnd * -1),
+		CreditCents:   summary.CreditCentsBalanceAtEnd * -1,
 		EffectiveTime: NewVarcharTime(now),
 		Kind:          InvoiceUsageKind,
 		Draft:         false,

components/usage/pkg/db/usage.go

@@ -163,8 +163,8 @@ func FindUsage(ctx context.Context, conn *gorm.DB, params *FindUsageParams) ([]U
 
 type UsageSummary struct {
 	NumRecordsInRange         int
-	CreditCentsBalanceAtStart int64
-	CreditCentsBalanceAtEnd   int64
+	CreditCentsBalanceAtStart CreditCents
+	CreditCentsBalanceAtEnd   CreditCents
 }
 
 func GetUsageSummary(ctx context.Context, conn *gorm.DB, attributionId AttributionID, from, to time.Time, excludeDrafts bool) (*UsageSummary, error) {
@@ -197,8 +197,8 @@ func GetUsageSummary(ctx context.Context, conn *gorm.DB, attributionId Attributi
 	}
 	return &UsageSummary{
 		NumRecordsInRange:         int(numRecordsInRange.Int32),
-		CreditCentsBalanceAtStart: creditCentsBalanceAtStart.Int64,
-		CreditCentsBalanceAtEnd:   creditCentsBalanceAtStart.Int64 + creditCentsBalanceInPeriod.Int64,
+		CreditCentsBalanceAtStart: CreditCents(creditCentsBalanceAtStart.Int64),
+		CreditCentsBalanceAtEnd:   CreditCents(creditCentsBalanceAtStart.Int64 + creditCentsBalanceInPeriod.Int64),
 	}, nil
 }