From 66dfaac3cbc01f0edb17a10cc72b620bac5f45ab Mon Sep 17 00:00:00 2001
From: Finley Lau <finley.lau@mongodb.com>
Date: Tue, 4 Nov 2025 15:27:17 -0600
Subject: [PATCH] SERVER-113382 Reserve location codes for extension errors and
 logs (#43533)

GitOrigin-RevId: d3e28a680d3859f938280edaf54dc861f220ca91
---
 buildscripts/errorcodes.py     | 13 ++++++++++++-
 src/mongo/base/error_codes.yml |  1 +
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/buildscripts/errorcodes.py b/buildscripts/errorcodes.py
index 6d76048a73d..4b8850c5e49 100755
--- a/buildscripts/errorcodes.py
+++ b/buildscripts/errorcodes.py
@@ -24,6 +24,8 @@ except ImportError:
     import re  # type: ignore
 
 MAXIMUM_CODE = 99999999  # JIRA Ticket + XX
+MIN_EXTENSION_RESERVED_CODE = 65000
+MAX_EXTENSION_RESERVED_CODE = 71000
 
 codes = []  # type: ignore
 
@@ -162,6 +164,7 @@ def read_error_codes(src_root="src/mongo"):
     dups = defaultdict(list)
     skips = []
     malformed = []  # type: ignore
+    reserved = []
 
     # define validation callbacks
     def check_dups(assert_loc):
@@ -181,11 +184,14 @@ def read_error_codes(src_root="src/mongo"):
             errors.append(assert_loc)
 
     def validate_code(assert_loc):
-        """Check for malformed codes."""
+        """Check for malformed codes or pre-reserved codes."""
         code = int(assert_loc.code)
         if code > MAXIMUM_CODE:
             malformed.append(assert_loc)
             errors.append(assert_loc)
+        elif code >= MIN_EXTENSION_RESERVED_CODE and code < MAX_EXTENSION_RESERVED_CODE:
+            reserved.append(assert_loc)
+            errors.append(assert_loc)
 
     def callback(assert_loc):
         validate_code(assert_loc)
@@ -217,6 +223,11 @@ def read_error_codes(src_root="src/mongo"):
         print("MALFORMED ID: %s" % loc.code)
         print("  %s:%d:%d:%s" % (loc.sourceFile, line, col, loc.lines))
 
+    for loc in reserved:
+        line, col = get_line_and_column_for_position(loc)
+        print("USE OF ALREADY RESERVED ID: %s" % loc.code)
+        print("  %s:%d:%d:%s" % (loc.sourceFile, line, col, loc.lines))
+
     return (codes, errors, seen)
 
 
diff --git a/src/mongo/base/error_codes.yml b/src/mongo/base/error_codes.yml
index 44453cbca30..7e7575a5118 100644
--- a/src/mongo/base/error_codes.yml
+++ b/src/mongo/base/error_codes.yml
@@ -1053,6 +1053,7 @@ error_codes:
     }
   - {code: 56846, name: ConfigServerUnreachable}
   - {code: 57986, name: RetryableInternalTransactionNotSupported}
+  # Codes 65000-70999 are reserved for extension-developed logs and errors. Do not use these unless they are used for writing an extension.
   - {code: 640570, name: IllegalChangeToExpectedShardVersion}
   - {code: 640571, name: IllegalChangeToExpectedDatabaseVersion}
   - {