Added logging, changed some directory structure

goTorrentWebUI/node_modules/react-scripts/node_modules/detect-port-alt/lib/detect-port.js

@@ -0,0 +1,102 @@
+'use strict'
+
+const debug = require('debug')('detect-port')
+const net = require('net')
+const address = require('address')
+
+module.exports = (port, host, callback) => {
+  if (typeof port === 'function') {
+    callback = port
+    port = null
+  } else if (typeof host === 'function') {
+    callback = host
+    host = null
+  }
+  port = parseInt(port) || 0
+  let maxPort = port + 10
+  if (maxPort > 65535) {
+    maxPort = 65535
+  }
+  debug('detect free port between [%s, %s)', port, maxPort)
+  if (typeof callback === 'function') {
+    return tryListen(host, port, maxPort, callback)
+  }
+  // promise
+  return new Promise((resolve, reject) => {
+    tryListen(host, port, maxPort, (error, realPort) => {
+      if (error) {
+        reject(error);
+      } else {
+        resolve(realPort);
+      }
+    })
+  })
+}
+
+function tryListen(host, port, maxPort, callback) {
+  function handleError() {
+    port++
+    if (port >= maxPort) {
+      debug(
+        'port: %s >= maxPort: %s, give up and use random port',
+        port,
+        maxPort
+      )
+      port = 0
+      maxPort = 0
+    }
+    tryListen(host, port, maxPort, callback)
+  }
+
+  // 1. check specified host (or null)
+  listen(port, host, (err, realPort) => {
+    // ignore random listening
+    if (port === 0) {
+      return callback(err, realPort)
+    }
+
+    if (err) {
+      return handleError(err)
+    }
+
+    // 2. check default host
+    listen(port, null, err => {
+      if (err) {
+        return handleError(err)
+      }
+
+      // 3. check localhost
+      listen(port, 'localhost', err => {
+        if (err) {
+          return handleError(err)
+        }
+
+        // 4. check current ip
+        listen(port, address.ip(), (err, realPort) => {
+          if (err) {
+            return handleError(err)
+          }
+
+          callback(null, realPort)
+        })
+      })
+    })
+  })
+}
+
+function listen(port, hostname, callback) {
+  const server = new net.Server()
+
+  server.on('error', err => {
+    debug('listen %s:%s error: %s', hostname, port, err)
+    server.close()
+    return callback(err)
+  })
+
+  server.listen(port, hostname, () => {
+    port = server.address().port
+    server.close()
+    debug('get free %s:%s', hostname, port)
+    return callback(null, port)
+  })
+}