temporary code to reset twap calc on negative values (#79)

Author: jhunsaker

program/src/oracle/upd_aggregate.h

@@ -108,16 +108,23 @@ static void upd_ema(
       pd_load( denom, ptr->denom_ );
     }
     else {
-      /* temporary upgrade code */
+      // temporary upgrade code
       pd_new_scale( numer, ptr->numer_, PD_EMA_EXPO );
       pd_new_scale( denom, ptr->denom_, PD_EMA_EXPO );
     }
-    pd_mul( numer, numer, decay );
-    pd_mul( wval, val, cwgt );
-    pd_add( numer, numer, wval, qs->fact_ );
-    pd_mul( denom, denom, decay );
-    pd_add( denom, denom, cwgt, qs->fact_ );
-    pd_div( val, numer, denom );
+    if ( numer->v_ < 0 || denom->v_ < 0 ) {
+      // temporary reset twap on negative value
+      pd_set( numer, val );
+      pd_set( denom, one );
+    }
+    else {
+      pd_mul( numer, numer, decay );
+      pd_mul( wval, val, cwgt );
+      pd_add( numer, numer, wval, qs->fact_ );
+      pd_mul( denom, denom, decay );
+      pd_add( denom, denom, cwgt, qs->fact_ );
+      pd_div( val, numer, denom );
+    }
   }
 
   // adjust and store results