Merge pull request #419 from NuSkooler/remove-mci-cache

Remove MCI cache

core/art.js

@@ -15,7 +15,6 @@ const paths     = require('path');
 const assert    = require('assert');
 const iconv     = require('iconv-lite');
 const _         = require('lodash');
-const xxhash    = require('xxhash');
 
 exports.getArt                          = getArt;
 exports.getArtFromPath                  = getArtFromPath;
@@ -251,7 +250,6 @@ function display(client, art, options, cb) {
     }
 
     options.mciReplaceChar = options.mciReplaceChar || ' ';
-    options.disableMciCache = options.disableMciCache || false;
 
     //  :TODO: this is going to be broken into two approaches controlled via options:
     //  1) Standard - use internal tracking of locations for MCI -- no CPR's/etc.
@@ -272,45 +270,7 @@ function display(client, art, options, cb) {
         startRow        : options.startRow,
     });
 
-    let parseComplete = false;
-    let mciMap;
-    const mciCprQueue = [];
-    let artHash;
-    let mciMapFromCache;
-
-    function completed() {
-
-        if(!options.disableMciCache && !mciMapFromCache) {
-            //  cache our MCI findings...
-            client.mciCache[artHash] = mciMap;
-            client.log.trace( { artHash : artHash.toString(16), mciMap : mciMap }, 'Added MCI map to cache');
-        }
-
-        ansiParser.removeAllListeners();    //  :TODO: Necessary???
-
-        const extraInfo = {
-            height : ansiParser.row - 1,
-        };
-
-        return cb(null, mciMap, extraInfo);
-    }
-
-    if(!options.disableMciCache) {
-        artHash = xxhash.hash(Buffer.from(art), 0xCAFEBABE);
-
-        //  see if we have a mciMap cached for this art
-        if(client.mciCache) {
-            mciMap  = client.mciCache[artHash];
-        }
-    }
-
-    if(mciMap) {
-        mciMapFromCache = true;
-        client.log.trace( { artHash : artHash.toString(16), mciMap : mciMap }, 'Loaded MCI map from cache');
-    } else {
-        //  no cached MCI info
-        mciMap = {};
-
+    const mciMap = {};
     let generatedId = 100;
 
     ansiParser.on('mci', mciInfo => {
@@ -337,17 +297,18 @@ function display(client, art, options, cb) {
         }
 
     });
-    }
 
     ansiParser.on('literal', literal => client.term.write(literal, false) );
     ansiParser.on('control', control => client.term.rawWrite(control) );
 
     ansiParser.on('complete', () => {
-        parseComplete = true;
+        ansiParser.removeAllListeners();
 
-        if(0 === mciCprQueue.length) {
-            return completed();
-        }
+        const extraInfo = {
+            height : ansiParser.row - 1,
+        };
+
+        return cb(null, mciMap, extraInfo);
     });
 
     let initSeq = '';

core/client.js

@@ -87,13 +87,8 @@ function Client(/*input, output*/) {
     this.lastActivityTime   = Date.now();
     this.menuStack          = new MenuStack(this);
     this.acs                = new ACS( { client : this, user : this.user } );
-    this.mciCache           = {};
     this.interruptQueue     = new UserInterruptQueue(this);
 
-    this.clearMciCache = function() {
-        this.mciCache = {};
-    };
-
     Object.defineProperty(this, 'currentTheme', {
         get : () => {
             if (this.currentThemeConfig) {

core/servers/login/ssh.js

@@ -231,8 +231,6 @@ function SSHClient(clientConn) {
         if(termHeight > 0 && termWidth > 0) {
             self.term.termHeight = termHeight;
             self.term.termWidth = termWidth;
-
-            self.clearMciCache();   //  term size changes = invalidate cache
         }
 
         if(_.isString(info.term) && info.term.length > 0 && 'unknown' === self.term.termType) {

core/servers/login/telnet.js

@@ -128,7 +128,7 @@ class TelnetClient {
                                 const value = parseInt(getValue(what));
                                 if (value) {
                                     this.term[what === 'ROWS' ? 'termHeight' : 'termWidth'] = value;
-                                    this.clearMciCache();
+
                                     this._logDebug(
                                         { [ what ] : value, source : 'NEW-ENVIRON' },
                                         'Window size updated'
@@ -157,8 +157,6 @@ class TelnetClient {
                             this.term.env.ROWS = height;
                         }
 
-                        this.clearMciCache();
-
                         this._logDebug(
                             { width, height, source : 'NAWS' },
                             'Windows size updated'

package.json

@@ -58,7 +58,6 @@
     "uuid": "8.3.2",
     "uuid-parse": "1.1.0",
     "ws": "7.4.3",
-    "xxhash": "^0.3.0",
     "yazl": "^2.5.1"
   },
   "devDependencies": {

yarn.lock

@@ -1231,7 +1231,7 @@ nan@^2.10.0:
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.11.1.tgz#90e22bccb8ca57ea4cd37cc83d3819b52eea6766"
   integrity sha512-iji6k87OSXa0CcrLl9z+ZiYSuR2o+c0bGuNmXdrhTQTakxytAFsC56SArGYoiHlJlFoHSnvmhpceZJaXkVuOtA==
 
-nan@^2.12.1, nan@^2.13.2, nan@^2.14.0:
+nan@^2.12.1, nan@^2.14.0:
   version "2.14.0"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.0.tgz#7818f722027b2459a86f0295d434d1fc2336c52c"
   integrity sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg==
@@ -2015,13 +2015,6 @@ xtend@~4.0.1:
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
   integrity sha1-pcbVMr5lbiPbgg77lDofBJmNY68=
 
-xxhash@^0.3.0:
-  version "0.3.0"
-  resolved "https://registry.yarnpkg.com/xxhash/-/xxhash-0.3.0.tgz#d20893a62c5b0f7260597dd55859b12a1e02c559"
-  integrity sha512-1ud2yyPiR1DJhgyF1ZVMt+Ijrn0VNS/wzej1Z8eSFfkNfRPp8abVZNV2u9tYy9574II0ZayZYZgJm8KJoyGLCw==
-  dependencies:
-    nan "^2.13.2"
-
 yallist@^3.0.0, yallist@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.0.2.tgz#8452b4bb7e83c7c188d8041c1a837c773d6d8bb9"