From 0bb71e4fcc0eeb7687b84ee196ea84bd1e5061a4 Mon Sep 17 00:00:00 2001
From: Tom Gasson <tgasson@atlassian.com>
Date: Tue, 3 Sep 2024 12:52:25 +1000
Subject: [PATCH] Shortcut hash computation for constant rules

This reduces the number of hashing operations performed substantially
---
 src/main/kotlin/com/statsig/sdk/Evaluator.kt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/main/kotlin/com/statsig/sdk/Evaluator.kt b/src/main/kotlin/com/statsig/sdk/Evaluator.kt
index bc28802..a95d6df 100644
--- a/src/main/kotlin/com/statsig/sdk/Evaluator.kt
+++ b/src/main/kotlin/com/statsig/sdk/Evaluator.kt
@@ -315,7 +315,11 @@ internal class Evaluator(
                     return
                 }
 
-                val pass =
+                val pass = if (rule.passPercentage == 0.0) {
+                    false
+                } else if (rule.passPercentage == 100.0){
+                    true
+                } else {
                     computeUserHash(
                         config.salt +
                             '.' +
@@ -324,6 +328,7 @@ internal class Evaluator(
                             (getUnitID(ctx.user, rule.idType) ?: Const.EMPTY_STR),
                     )
                         .mod(10000UL) < (rule.passPercentage.times(100.0)).toULong()
+                }
 
                 if (!pass) {
                     ctx.evaluation.jsonValue = config.defaultValue