FEAT: Allow interval option from environment variable (bahmutov#315)

* Allow interval option from environment variable

* feat(test): add new demo for testing, update README

README.md

@@ -279,6 +279,10 @@ To disable HTTPS checks for `wait-on`, run with environment variable `START_SERV
 
 This utility will wait for maximum of 5 minutes while checking for the server to respond (default). Setting an environment variable `WAIT_ON_TIMEOUT=600000` (milliseconds) sets the timeout for example to 10 minutes.
 
+### Interval
+
+This utility will check for a server response every two seconds (default). Setting an environment variable `WAIT_ON_INTERVAL=600000` (milliseconds) sets the interval for example to 10 minutes.
+
 ### Starting two servers
 
 Sometimes you need to start one API server and one webserver in order to test the application. Use the syntax:

package.json

@@ -92,6 +92,8 @@
     "demo10": "node src/bin/start.js start-fail http://127.0.0.1:9000 test",
     "demo11": "node src/bin/start.js http-get://127.0.0.1:9000",
     "demo12": "node src/bin/start.js start-304 9000 test2",
+    "demo-interval": "WAIT_ON_INTERVAL=1000 node src/bin/start.js start http://127.0.0.1:9000 test2",
+    "demo-timeout": "WAIT_ON_TIMEOUT=10000 node src/bin/start.js start http://127.0.0.1:9000 test2",
     "demo-cross-env": "node src/bin/start.js start-cross-env 9000",
     "demo-commands": "node src/bin/start.js 'node test/server.js --port 8800' 8800 'node test/client --port 8800'",
     "demo-multiple": "node src/bin/start.js 'node test/server --port 6000' 6000 'node test/server --port 6010' 6010 'curl http://127.0.0.1:6000 && curl http://127.0.0.1:6010'",

src/index.js

@@ -13,10 +13,16 @@ const debug = require('debug')('start-server-and-test')
  * Used for timeout (ms)
  */
 const fiveMinutes = 5 * 60 * 1000
+const twoSeconds = 2000
+
 const waitOnTimeout = process.env.WAIT_ON_TIMEOUT
   ? Number(process.env.WAIT_ON_TIMEOUT)
   : fiveMinutes
 
+const waitOnInterval = process.env.WAIT_ON_INTERVAL
+  ? Number(process.env.WAIT_ON_INTERVAL)
+  : twoSeconds
+
 const isDebug = () =>
   process.env.DEBUG && process.env.DEBUG.indexOf('start-server-and-test') !== -1
 
@@ -74,7 +80,7 @@ function waitAndRun ({ start, url, runFn }) {
     debug('starting waitOn %s', url)
     const options = {
       resources: Array.isArray(url) ? url : [url],
-      interval: 2000,
+      interval: waitOnInterval,
       window: 1000,
       timeout: waitOnTimeout,
       verbose: isDebug(),

src/utils.js

@@ -199,6 +199,14 @@ function printArguments ({ services, test }) {
     )
   })
 
+  if (process.env.WAIT_ON_INTERVAL !== undefined) {
+    console.log('WAIT_ON_INTERVAL is set to', process.env.WAIT_ON_INTERVAL)
+  }
+
+  if (process.env.WAIT_ON_TIMEOUT !== undefined) {
+    console.log('WAIT_ON_TIMEOUT is set to', process.env.WAIT_ON_TIMEOUT)
+  }
+
   console.log('running tests using command "%s"', test)
   console.log('')
 }