[isso] feature: add support for log messages formatting

README.md

Isso feature: add support for log messages formatting

Patch v1.0.0 (for Isso v0.13.0+)

Why ?

See isso-comments/isso#976 for context.

How to apply this patch in production ?

apt-get update && apt-get install patchutils

cd /path/to/isso/
wget -qO- https://gist.githubusercontent.com/HorlogeSkynet/7052787db2d3e2027a848ed399d824c4/raw/isso-976.patch \
    | filterdiff -p 1 -i 'isso/*' \
    | patch -p 2

isso-976.patch

From a76b1392e8ee5eb4305999a0a1288806054476f4 Mon Sep 17 00:00:00 2001
From: Samuel FORESTIER <samuel+dev@forestier.app>
Date: Wed, 8 Nov 2023 20:14:43 +0100
Subject: [PATCH] feature: add support for log messages formatting

---
 CHANGES.rst                           |  7 ++++++-
 contrib/isso-dev.cfg                  |  1 +
 docs/docs/reference/server-config.rst | 12 ++++++++++++
 isso/__init__.py                      |  3 +++
 isso/isso.cfg                         |  4 ++++
 5 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index 21d711078..34b763136 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -14,7 +14,12 @@ New Features
 Breaking Changes
 ^^^^^^^^^^^^^^^^
 
-- TBD
+- Change default log messages formatting and make it configurable (`#976`_, HorlogeSkynet)
+
+    [general]
+    log-format = %(asctime)s:%(levelname)s:%(name)s:%(message)s
+
+.. _#976: https://github.com/posativ/isso/pull/976
 
 Bugfixes & Improvements
 ^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/contrib/isso-dev.cfg b/contrib/isso-dev.cfg
index d3820ee51..b1f817e4d 100644
--- a/contrib/isso-dev.cfg
+++ b/contrib/isso-dev.cfg
@@ -16,6 +16,7 @@ max-age = 15m
 notify = stdout
 reply-notifications = false
 log-file =
+log-format = %(asctime)s:%(levelname)s:%(name)s:%(message)s
 latest-enabled = true
 
 [admin]
diff --git a/docs/docs/reference/server-config.rst b/docs/docs/reference/server-config.rst
index 833bd6bbd..84154a625 100644
--- a/docs/docs/reference/server-config.rst
+++ b/docs/docs/reference/server-config.rst
@@ -49,6 +49,7 @@ Here are the **default values** for this section:
     max-age = 15m
     notify = stdout
     log-file =
+    log-format = %(asctime)s:%(levelname)s:%(name)s:%(message)s
     gravatar = false
     gravatar-url = https://www.gravatar.com/avatar/{}?d=identicon&s=55
     latest-enabled = false
@@ -118,6 +119,17 @@ log-file
 
     Default: (empty)
 
+log-format
+    Format string for console messages logged to file (see ``log-file`` option).
+    Also see Python `LogRecord attributes`_ documentation for the full list of
+    attributes.
+    Please do note this option is interpolated by Python runtime and may lead
+    to security issues if not trusted.
+
+    Default: %(asctime)s:%(levelname)s:%(name)s:%(message)s
+
+.. _LogRecord attributes: https://docs.python.org/3/library/logging.html#logrecord-attributes
+
 gravatar
     When set to ``true`` this will add the property "gravatar_image"
     containing the link to a gravatar image to every comment. If a comment
diff --git a/isso/__init__.py b/isso/__init__.py
index 68468de73..e90d9976e 100644
--- a/isso/__init__.py
+++ b/isso/__init__.py
@@ -281,6 +281,9 @@ def main():
     if conf.get("general", "log-file"):
         handler = logging.FileHandler(conf.get("general", "log-file"))
 
+        if conf.get("general", "log-format"):
+            handler.setFormatter(logging.Formatter(conf.get("general", "log-format")))
+
         logger.addHandler(handler)
         logging.getLogger("werkzeug").addHandler(handler)
 
diff --git a/isso/isso.cfg b/isso/isso.cfg
index 3827a61bb..b54f52ede 100644
--- a/isso/isso.cfg
+++ b/isso/isso.cfg
@@ -51,6 +51,10 @@ reply-notifications=false
 # Log console messages to file instead of standard output.
 log-file =
 
+# Format string for console messages logged to file (see Python
+# ``logging.Formatter``).
+log-format = %(asctime)s:%(levelname)s:%(name)s:%(message)s
+
 # adds property "gravatar_image" to json response when true
 # will automatically build md5 hash by email and use "gravatar_url" to build
 # the url to the gravatar image