chore: refactor main code base into smaller parts

lib/multi.js

@@ -3,6 +3,7 @@
 const Queue = require('denque')
 const utils = require('./utils')
 const Command = require('./command')
+const handleReply = utils.handleReply
 
 /**
  * @description Queues all transaction commands and checks if a queuing error
@@ -23,9 +24,6 @@ function pipelineTransactionCommand (multi, command, index) {
       multi.errors.push(err)
       return
     }
-    // Keep track of who wants buffer responses:
-    // By the time the callback is called the command got the bufferArgs attribute attached
-    multi.wantsBuffers[index] = command.bufferArgs
     tmp(null, reply)
   }
   return multi._client.internalSendCommand(command)
@@ -41,8 +39,10 @@ function pipelineTransactionCommand (multi, command, index) {
 function multiCallback (multi, replies) {
   if (replies) {
     var i = 0
-    while (multi._queue.length !== 0) {
-      const command = multi._queue.shift()
+    const queue = multi._queue
+    const client = multi._client
+    while (queue.length !== 0) {
+      const command = queue.shift()
       if (replies[i] instanceof Error) {
         const match = replies[i].message.match(utils.errCode)
         // LUA script could return user errors that don't behave like all other errors!
@@ -53,7 +53,7 @@ function multiCallback (multi, replies) {
         command.callback(replies[i])
       } else {
         // If we asked for strings, even in detectBuffers mode, then return strings:
-        replies[i] = multi._client.handleReply(replies[i], command.command, multi.wantsBuffers[i])
+        replies[i] = handleReply(client, replies[i], command)
         command.callback(null, replies[i])
       }
       i++