chore: configurable log level for application (#12379)

Author: Dschoordsch

.env.example

@@ -192,6 +192,8 @@ MAIL_PROVIDER='debug'
 # LOGGING
 # Enable additional audit logs for select mutations
 AUDIT_LOGS='true'
+# highest log level, 'debug' | 'info' | 'warn' | 'error', defaults to 'info'
+# LOG_LEVEL='info'
 
 #
 # DEVELOPER VARIABLES

packages/server/utils/Logger.ts

@@ -2,7 +2,21 @@ import tracer from 'dd-trace'
 import formats from 'dd-trace/ext/formats'
 import util from 'util'
 
-type LogLevel = 'error' | 'warn' | 'info' | 'debug'
+const Levels = {
+  error: 1,
+  warn: 2,
+  info: 3,
+  debug: 4
+} as const
+type LogLevel = keyof typeof Levels
+
+const LOG_LEVEL = Levels[(process.env.LOG_LEVEL || 'info') as LogLevel]
+if (!LOG_LEVEL) {
+  throw new Error(
+    `Invalid LOG_LEVEL: ${process.env.LOG_LEVEL}, allowed values are: ${Object.keys(Levels).join(', ')}`
+  )
+}
+
 const LogFun = {
   error: console.error,
   warn: console.warn,
@@ -47,10 +61,17 @@ function trace(level: LogLevel, message: any, ...optionalParameters: any[]) {
   LogFun[level](JSON.stringify(record))
 }
 
+const bindIfEnabled = (level: LogLevel) => {
+  if (Levels[level] <= LOG_LEVEL) {
+    return trace.bind(null, level)
+  }
+  return () => {}
+}
+
 export const Logger = {
-  log: trace.bind(null, 'info'),
-  error: trace.bind(null, 'error'),
-  warn: trace.bind(null, 'warn'),
-  info: trace.bind(null, 'info'),
-  debug: trace.bind(null, 'debug')
+  log: bindIfEnabled('info'),
+  error: bindIfEnabled('error'),
+  warn: bindIfEnabled('warn'),
+  info: bindIfEnabled('info'),
+  debug: bindIfEnabled('debug')
 }