Add Fastify sample

README.md

@@ -201,7 +201,7 @@ const logger = createLogger({
 })
 ```
 
-Complete samples for Express and Koa are available in `/samples/` directory.
+Complete samples for Express, Fastify and Koa are available in `/samples/` directory.
 
 ## Middleware configuration
 

samples/fastify.winston.js

@@ -0,0 +1,53 @@
+'use strict'
+
+const rTracer = require('../index')
+
+// first - configure winston logger
+
+const { createLogger, format, transports } = require('winston')
+const { combine, timestamp, printf } = format
+
+// a custom format that outputs request id
+const rTracerFormat = printf((info) => {
+  const rid = rTracer.id()
+  return rid
+    ? `${info.timestamp} [request-id:${rid}]: ${info.message}`
+    : `${info.timestamp}: ${info.message}`
+})
+
+const logger = createLogger({
+  format: combine(
+    timestamp(),
+    rTracerFormat
+  ),
+  transports: [new transports.Console()]
+})
+
+// next - configure and start Fastify app
+
+const Fastify = require('fastify')
+const app = new Fastify()
+
+app.use(rTracer.fastifyMiddleware())
+
+app.get('/', async (request, reply) => {
+  logger.info('Starting request handling')
+  const result = await fakeDbAccess()
+  reply.send(result)
+})
+
+async function fakeDbAccess () {
+  return new Promise((resolve) => {
+    setTimeout(() => {
+      logger.info('Logs from fakeDbAccess')
+      resolve({ message: 'Hello from cls-rtracer Fastify example' })
+    }, 0)
+  })
+}
+
+app.listen(3000, (err) => {
+  if (err) {
+    logger.err('The app could not start')
+  }
+  logger.info('The app is listening on 3000')
+})