feat: add support for customizing logger configuration

args.js

@@ -6,7 +6,7 @@ module.exports = function parseArgs (args) {
   const parsedArgs = argv(args, {
     number: ['port', 'inspect-port', 'body-limit', 'plugin-timeout'],
     boolean: ['pretty-logs', 'options', 'watch', 'debug'],
-    string: ['log-level', 'address', 'socket', 'prefix', 'ignore-watch'],
+    string: ['log-level', 'address', 'socket', 'prefix', 'ignore-watch', 'logging-module'],
     envPrefix: 'FASTIFY_',
     alias: {
       port: ['p'],
@@ -20,7 +20,8 @@ module.exports = function parseArgs (args) {
       'debug-port': ['I'],
       'log-level': ['l'],
       'pretty-logs': ['P'],
-      'plugin-timeout': ['T']
+      'plugin-timeout': ['T'],
+      'logging-module': ['L']
     },
     default: {
       'log-level': 'fatal',
@@ -48,6 +49,7 @@ module.exports = function parseArgs (args) {
     logLevel: parsedArgs.logLevel,
     address: parsedArgs.address,
     socket: parsedArgs.socket,
-    prefix: parsedArgs.prefix
+    prefix: parsedArgs.prefix,
+    loggingModule: parsedArgs.loggingModule
   }
 }

help/start.txt

@@ -16,6 +16,10 @@ Usage: fastify start [opts] <file>
   [env: FASTIFY_LOG_LEVEL]
       Log level (default to fatal)
 
+  -L, --logging-module
+  [env: FASTIFY_LOGGING_MODULE]
+      Path to logging configuration module to use
+
   -P, --pretty-logs
   [env: FASTIFY_PRETTY_LOGS]
       Prints pretty logs

start.js

@@ -5,6 +5,8 @@
 require('dotenv').config()
 
 const assert = require('assert')
+const path = require('path')
+
 const updateNotifier = require('update-notifier')
 const PinoColada = require('pino-colada')
 const pump = require('pump')
@@ -83,10 +85,24 @@ function runFastify (args, cb) {
     return module.exports.stop(e)
   }
 
+  let logger
+  if (opts.loggingModule) {
+    try {
+      const moduleFilePath = path.resolve(opts.loggingModule)
+      const moduleFileExtension = path.extname(opts.loggingModule)
+      const modulePath = moduleFilePath.split(moduleFileExtension)[0]
+
+      logger = require(modulePath)
+    } catch (e) {
+      module.exports.stop(e)
+    }
+  }
+
+  const defaultLogger = {
+    level: opts.logLevel
+  }
   const options = {
-    logger: {
-      level: opts.logLevel
-    },
+    logger: logger || defaultLogger,
 
     pluginTimeout: opts.pluginTimeout
   }

test/args.test.js

@@ -19,6 +19,7 @@ test('should parse args correctly', t => {
     '--body-limit', '5242880',
     '--debug', 'true',
     '--debug-port', 1111,
+    '--logging-module', './custom-logger.js',
     'app.js'
   ]
   const parsedArgs = parseArgs(argv)
@@ -37,7 +38,8 @@ test('should parse args correctly', t => {
     pluginTimeout: 500,
     bodyLimit: 5242880,
     debug: true,
-    debugPort: 1111
+    debugPort: 1111,
+    loggingModule: './custom-logger.js'
   })
 })
 
@@ -58,6 +60,7 @@ test('should parse args with = assignment correctly', t => {
     '--body-limit=5242880',
     '--debug=true',
     '--debug-port', 1111,
+    '--logging-module', './custom-logger.js',
     'app.js'
   ]
   const parsedArgs = parseArgs(argv)
@@ -76,7 +79,8 @@ test('should parse args with = assignment correctly', t => {
     pluginTimeout: 500,
     bodyLimit: 5242880,
     debug: true,
-    debugPort: 1111
+    debugPort: 1111,
+    loggingModule: './custom-logger.js'
   })
 })
 
@@ -96,6 +100,7 @@ test('should parse env vars correctly', t => {
   process.env.FASTIFY_PLUGIN_TIMEOUT = '500'
   process.env.FASTIFY_DEBUG = 'true'
   process.env.FASTIFY_DEBUG_PORT = '1111'
+  process.env.FASTIFY_LOGGING_MODULE = './custom-logger.js'
 
   t.teardown(function () {
     delete process.env.FASTIFY_PORT
@@ -111,6 +116,7 @@ test('should parse env vars correctly', t => {
     delete process.env.FASTIFY_PLUGIN_TIMEOUT
     delete process.env.FASTIFY_DEBUG
     delete process.env.FASTIFY_DEBUG_PORT
+    delete process.env.FASTIFY_LOGGING_MODULE
   })
 
   const parsedArgs = parseArgs([])
@@ -129,12 +135,13 @@ test('should parse env vars correctly', t => {
     socket: 'fastify.io.socket:9999',
     pluginTimeout: 500,
     debug: true,
-    debugPort: 1111
+    debugPort: 1111,
+    loggingModule: './custom-logger.js'
   })
 })
 
 test('should respect default values', t => {
-  t.plan(9)
+  t.plan(10)
 
   const argv = [
     'app.js'
@@ -151,4 +158,5 @@ test('should respect default values', t => {
   t.is(parsedArgs.pluginTimeout, 10000)
   t.is(parsedArgs.debug, false)
   t.is(parsedArgs.debugPort, 9320)
+  t.is(parsedArgs.loggingModule, undefined)
 })

test/data/custom-logger.js

@@ -0,0 +1,6 @@
+module.exports = {
+  name: 'Custom Logger',
+  customLevels: {
+    test: 99
+  }
+}

test/start.test.js

@@ -545,3 +545,32 @@ test('boolean env are not overridden if no arguments are passed', t => {
     t.pass('Custom options')
   }
 })
+
+test('should support custom logger configuration', t => {
+  t.plan(2)
+
+  const argv = ['-L', './test/data/custom-logger.js', './examples/plugin.js']
+  start.start(argv, (err, fastify) => {
+    t.error(err)
+    t.ok(fastify.log.test)
+
+    fastify.close()
+  })
+})
+
+test('should throw on logger configuration module not found', t => {
+  t.plan(2)
+
+  const oldStop = start.stop
+  t.tearDown(() => { start.stop = oldStop })
+  start.stop = function (err) {
+    t.ok(/Cannot find module/.test(err.message), err.message)
+  }
+
+  const argv = ['-L', './test/data/missing.js', './examples/plugin.js']
+  start.start(argv, (err, fastify) => {
+    t.error(err)
+
+    fastify.close()
+  })
+})