feat: add logs on recent data when error occur (#1)

Author: josebmendozam

index.js

@@ -11,15 +11,33 @@ var DB = process.env.DB || path.join(__dirname, 'db')
 
 var db = DB_CLOSED ? {} : level(DB)
 
+var EXTENDED_LOGS = ['arborist', 'blackbird', 'strategis'].some(p => (process.env.HOSTNAME || '').includes(p) || (process.env.DB_NAME || '').includes(p))
+
 var server = net.createServer(function (sock) {
+  var dataBuffer = []
+  var mldbServer = multileveldown.server(db)
+
+  sock.on('data', function (data) {
+    if (EXTENDED_LOGS) dataBuffer.push({ data: data.toString(), ts: new Date().toISOString() })
+    if (dataBuffer.length > 200) dataBuffer.shift()
+  })
+
+  mldbServer.on('error', function (err) {
+    if (EXTENDED_LOGS) console.log({ dataBuffer, mldbError: err })
+    sock.destroy()
+    if (err) return console.error(err)
+    process.exit(1)
+  })
+
   sock.on('error', function (err) {
+    if (EXTENDED_LOGS) console.log({ dataBuffer, socketError: err })
     sock.destroy()
     if (err) return console.error(err)
     process.exit(1)
   })
 
   if (!DB_CLOSED) {
-    sock.pipe(multileveldown.server(db)).pipe(sock)
+    sock.pipe(mldbServer).pipe(sock)
   }
 })
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "multilevel-db",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "main": "index.js",
   "scripts": {
     "start": "node index.js",