From be964e731f8b0ff81873ea7d39684bebee2db371 Mon Sep 17 00:00:00 2001
From: Andrey Berezin <a.berezin@yadro.com>
Date: Wed, 13 Dec 2023 13:59:37 +0300
Subject: [PATCH] [#146] Prettify verifier messages for error rates

Signed-off-by: Andrey Berezin <a.berezin@yadro.com>
---
 src/frostfs_testlib/load/load_verifiers.py | 40 +++++++++++++---------
 1 file changed, 24 insertions(+), 16 deletions(-)

diff --git a/src/frostfs_testlib/load/load_verifiers.py b/src/frostfs_testlib/load/load_verifiers.py
index fe39862..5ca92dc 100644
--- a/src/frostfs_testlib/load/load_verifiers.py
+++ b/src/frostfs_testlib/load/load_verifiers.py
@@ -44,22 +44,20 @@ class LoadVerifier:
         if deleters and not delete_operations:
             issues.append(f"No any delete operation was performed")
 
-        if write_operations and writers and write_errors / write_operations * 100 > self.load_params.error_threshold:
-            issues.append(
-                f"Write error rate is greater than threshold: {write_errors / write_operations * 100} > {self.load_params.error_threshold}"
-            )
-        if read_operations and readers and read_errors / read_operations * 100 > self.load_params.error_threshold:
-            issues.append(
-                f"Read error rate is greater than threshold: {read_errors / read_operations * 100} > {self.load_params.error_threshold}"
-            )
-        if (
-            delete_operations
-            and deleters
-            and delete_errors / delete_operations * 100 > self.load_params.error_threshold
-        ):
-            issues.append(
-                f"Delete error rate is greater than threshold: {delete_errors / delete_operations * 100} > {self.load_params.error_threshold}"
-            )
+        error_rate = self._get_error_rate(writers, write_operations, write_errors)
+        if error_rate > self.load_params.error_threshold:
+            rate_str = self._get_rate_str(error_rate)
+            issues.append(f"Write errors exceeded threshold: {rate_str} > {self.load_params.error_threshold}%")
+
+        error_rate = self._get_error_rate(readers, read_operations, read_errors)
+        if error_rate > self.load_params.error_threshold:
+            rate_str = self._get_rate_str(error_rate)
+            issues.append(f"Read errors exceeded threshold: {rate_str} > {self.load_params.error_threshold}%")
+
+        error_rate = self._get_error_rate(deleters, delete_operations, delete_errors)
+        if error_rate > self.load_params.error_threshold:
+            rate_str = self._get_rate_str(error_rate)
+            issues.append(f"Delete errors exceeded threshold: {rate_str} > {self.load_params.error_threshold}%")
 
         return issues
 
@@ -76,6 +74,16 @@ class LoadVerifier:
                 )
         return verify_issues
 
+    def _get_error_rate(self, vus: int, operations: int, errors: int) -> float:
+        if not operations or not vus:
+            return 0
+
+        error_rate = errors / operations * 100
+        return error_rate
+
+    def _get_rate_str(self, rate: float, minimal: float = 0.01) -> str:
+        return f"{rate:.2f}%" if rate >= minimal else f"~{minimal}%"
+
     def _collect_verify_issues_on_process(self, label, load_summary, verification_summary) -> list[str]:
         issues = []