From cfa4b596d1f31656f9116cc16f2a4ff7d15c2837 Mon Sep 17 00:00:00 2001
From: Christopher Brookes <chris.klaitos@gmail.com>
Date: Sat, 5 Nov 2022 13:20:57 +0100
Subject: [PATCH] feat(logger): implement structured log formatter gcp
 compliant (#1028)

* feat(logger): implement structured log formatter gcp compliant

* docs: add new gcp logging format
---
 docs/configuration.md | 1 +
 logger/log.go         | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/docs/configuration.md b/docs/configuration.md
index 69ef1c94..36202b69 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -434,6 +434,7 @@ imgproxy can report occurred errors to Bugsnag, Honeybadger and Sentry:
   * `pretty`: _(default)_ colored human-readable format
   * `structured`: machine-readable format
   * `json`: JSON format
+  * `gcp`: Google Cloud Logging agent compliant
 * `IMGPROXY_LOG_LEVEL`: the log level. The following levels are supported `error`, `warn`, `info` and `debug`. Default: `info`
 
 imgproxy can send logs to syslog, but this feature is disabled by default. To enable it, set `IMGPROXY_SYSLOG_ENABLE` to `true`:
diff --git a/logger/log.go b/logger/log.go
index f7d7c632..02ba9926 100644
--- a/logger/log.go
+++ b/logger/log.go
@@ -23,6 +23,13 @@ func Init() error {
 		logrus.SetFormatter(&structuredFormatter{})
 	case "json":
 		logrus.SetFormatter(&logrus.JSONFormatter{})
+	case "gcp":
+		logrus.SetFormatter(&logrus.JSONFormatter{
+			FieldMap: logrus.FieldMap{
+				"level": "severity",
+				"msg":   "message",
+			},
+		})
 	default:
 		logrus.SetFormatter(newPrettyFormatter())
 	}