channeldb+lnd: rpc server filters invoices by date

channeldb/invoices.go

@@ -1279,6 +1279,14 @@ type InvoiceQuery struct {
 	// Reversed, if set, indicates that the invoices returned should start
 	// from the IndexOffset and go backwards.
 	Reversed bool
+
+	// CreationDateStart, if set, filters out all invoices with a creation
+	// date greater than or euqal to it.
+	CreationDateStart time.Time
+
+	// CreationDateEnd, if set, filters out all invoices with a creation
+	// date less than or euqal to it.
+	CreationDateEnd time.Time
 }
 
 // InvoiceSlice is the response to a invoice query. It includes the original
@@ -1309,7 +1317,11 @@ type InvoiceSlice struct {
 // QueryInvoices allows a caller to query the invoice database for invoices
 // within the specified add index range.
 func (d *DB) QueryInvoices(q InvoiceQuery) (InvoiceSlice, error) {
-	var resp InvoiceSlice
+	var (
+		resp         InvoiceSlice
+		startDateSet = !q.CreationDateStart.IsZero()
+		endDateSet   = !q.CreationDateEnd.IsZero()
+	)
 
 	err := kvdb.View(d, func(tx kvdb.RTx) error {
 		// If the bucket wasn't found, then there aren't any invoices
@@ -1349,6 +1361,24 @@ func (d *DB) QueryInvoices(q InvoiceQuery) (InvoiceSlice, error) {
 				return false, nil
 			}
 
+			// Skip any invoices that were created before the
+			// specified time.
+			if startDateSet && invoice.CreationDate.Before(
+				q.CreationDateStart,
+			) {
+
+				return false, nil
+			}
+
+			// Skip any invoices that were created after the
+			// specified time.
+			if endDateSet && invoice.CreationDate.After(
+				q.CreationDateEnd,
+			) {
+
+				return false, nil
+			}
+
 			// At this point, we've exhausted the offset, so we'll
 			// begin collecting invoices found within the range.
 			resp.Invoices = append(resp.Invoices, invoice)