Low hanging fruit: Don't re-create binary parsers constantly

core/ftn_mail_packet.js

@@ -165,6 +165,74 @@ exports.PacketHeader = PacketHeader;
 //  *   Writeup on differences between type 2, 2.2, and 2+:
 //      http://walon.org/pub/fidonet/FTSC-nodelists-etc./pkt-types.txt
 //
+const PacketHeaderParser = new Parser()
+    .uint16le('origNode')
+    .uint16le('destNode')
+    .uint16le('year')
+    .uint16le('month')
+    .uint16le('day')
+    .uint16le('hour')
+    .uint16le('minute')
+    .uint16le('second')
+    .uint16le('baud')
+    .uint16le('packetType')
+    .uint16le('origNet')
+    .uint16le('destNet')
+    .int8('prodCodeLo')
+    .int8('prodRevLo')  //  aka serialNo
+    .buffer('password', { length : 8 }) //  can't use string; need CP437 - see https://github.com/keichi/binary-parser/issues/33
+    .uint16le('origZone')
+    .uint16le('destZone')
+    //
+    //  The following is "filler" in FTS-0001, specifics in
+    //  FSC-0045 and FSC-0048
+    //
+    .uint16le('auxNet')
+    .uint16le('capWordValidate')
+    .int8('prodCodeHi')
+    .int8('prodRevHi')
+    .uint16le('capWord')
+    .uint16le('origZone2')
+    .uint16le('destZone2')
+    .uint16le('origPoint')
+    .uint16le('destPoint')
+    .uint32le('prodData');
+
+const MessageHeaderParser = new Parser()
+    .uint16le('messageType')
+    .uint16le('ftn_msg_orig_node')
+    .uint16le('ftn_msg_dest_node')
+    .uint16le('ftn_msg_orig_net')
+    .uint16le('ftn_msg_dest_net')
+    .uint16le('ftn_attr_flags')
+    .uint16le('ftn_cost')
+    //
+    //  It would be nice to just string() these, but we want CP437 which requires
+    //  iconv. Another option would be to use a formatter, but until issue 33
+    //  (https://github.com/keichi/binary-parser/issues/33) is fixed, this is cumbersome.
+    //
+    .array('modDateTime', {
+        type        : 'uint8',
+        length      : 20,   //  FTS-0001.016: 20 bytes
+    })
+    .array('toUserName', {
+        type        : 'uint8',
+        //  :TODO: array needs some soft of 'limit' field
+        readUntil   : b => 0x00 === b,
+    })
+    .array('fromUserName', {
+        type        : 'uint8',
+        readUntil   : b => 0x00 === b,
+    })
+    .array('subject', {
+        type        : 'uint8',
+        readUntil   : b => 0x00 === b,
+    })
+    .array('message', {
+        type        : 'uint8',
+        readUntil   : b => 0x00 === b,
+    });
+
 function Packet(options) {
     var self = this;
 
@@ -175,39 +243,7 @@ function Packet(options) {
 
         let packetHeader;
         try {
-            packetHeader = new Parser()
+            packetHeader = PacketHeaderParser.parse(packetBuffer);
-                .uint16le('origNode')
-                .uint16le('destNode')
-                .uint16le('year')
-                .uint16le('month')
-                .uint16le('day')
-                .uint16le('hour')
-                .uint16le('minute')
-                .uint16le('second')
-                .uint16le('baud')
-                .uint16le('packetType')
-                .uint16le('origNet')
-                .uint16le('destNet')
-                .int8('prodCodeLo')
-                .int8('prodRevLo')  //  aka serialNo
-                .buffer('password', { length : 8 }) //  can't use string; need CP437 - see https://github.com/keichi/binary-parser/issues/33
-                .uint16le('origZone')
-                .uint16le('destZone')
-                //
-                //  The following is "filler" in FTS-0001, specifics in
-                //  FSC-0045 and FSC-0048
-                //
-                .uint16le('auxNet')
-                .uint16le('capWordValidate')
-                .int8('prodCodeHi')
-                .int8('prodRevHi')
-                .uint16le('capWord')
-                .uint16le('origZone2')
-                .uint16le('destZone2')
-                .uint16le('origPoint')
-                .uint16le('destPoint')
-                .uint32le('prodData')
-                .parse(packetBuffer);
         } catch(e) {
             return Errors.Invalid(`Unable to parse FTN packet header: ${e.message}`);
         }
@@ -544,41 +580,7 @@ function Packet(options) {
 
         let msgData;
         try {
-            msgData = new Parser()
+            msgData = MessageHeaderParser.parse(packetBuffer);
-                .uint16le('messageType')
-                .uint16le('ftn_msg_orig_node')
-                .uint16le('ftn_msg_dest_node')
-                .uint16le('ftn_msg_orig_net')
-                .uint16le('ftn_msg_dest_net')
-                .uint16le('ftn_attr_flags')
-                .uint16le('ftn_cost')
-                //
-                //  It would be nice to just string() these, but we want CP437 which requires
-                //  iconv. Another option would be to use a formatter, but until issue 33
-                //  (https://github.com/keichi/binary-parser/issues/33) is fixed, this is cumbersome.
-                //
-                .array('modDateTime', {
-                    type        : 'uint8',
-                    length      : 20,   //  FTS-0001.016: 20 bytes
-                })
-                .array('toUserName', {
-                    type        : 'uint8',
-                    //  :TODO: array needs some soft of 'limit' field
-                    readUntil   : b => 0x00 === b,
-                })
-                .array('fromUserName', {
-                    type        : 'uint8',
-                    readUntil   : b => 0x00 === b,
-                })
-                .array('subject', {
-                    type        : 'uint8',
-                    readUntil   : b => 0x00 === b,
-                })
-                .array('message', {
-                    type        : 'uint8',
-                    readUntil   : b => 0x00 === b,
-                })
-                .parse(packetBuffer);
         } catch(e) {
             return cb(Errors.Invalid(`Failed to parse FTN message header: ${e.message}`));
         }

core/sauce.js

@@ -26,6 +26,25 @@ exports.SAUCE_SIZE      = SAUCE_SIZE;
 //
 const SAUCE_VALID_DATA_TYPES = [0, 1, 2, 3, 4, 5, 6, 7, 8 ];
 
+const SAUCEParser = new Parser()
+    .buffer('id', { length : 5 } )
+    .buffer('version', { length : 2 } )
+    .buffer('title', { length: 35 } )
+    .buffer('author', { length : 20 } )
+    .buffer('group', { length: 20 } )
+    .buffer('date', { length: 8 } )
+    .uint32le('fileSize')
+    .int8('dataType')
+    .int8('fileType')
+    .uint16le('tinfo1')
+    .uint16le('tinfo2')
+    .uint16le('tinfo3')
+    .uint16le('tinfo4')
+    .int8('numComments')
+    .int8('flags')
+    //  :TODO: does this need to be optional?
+    .buffer('tinfos', { length: 22 } );  //  SAUCE 00.5
+
 function readSAUCE(data, cb) {
     if(data.length < SAUCE_SIZE) {
         return cb(Errors.DoesNotExist('No SAUCE record present'));
@@ -33,30 +52,11 @@ function readSAUCE(data, cb) {
 
     let sauceRec;
     try {
-        sauceRec = new Parser()
+        sauceRec = SAUCEParser.parse(data.slice(data.length - SAUCE_SIZE));
-            .buffer('id', { length : 5 } )
-            .buffer('version', { length : 2 } )
-            .buffer('title', { length: 35 } )
-            .buffer('author', { length : 20 } )
-            .buffer('group', { length: 20 } )
-            .buffer('date', { length: 8 } )
-            .uint32le('fileSize')
-            .int8('dataType')
-            .int8('fileType')
-            .uint16le('tinfo1')
-            .uint16le('tinfo2')
-            .uint16le('tinfo3')
-            .uint16le('tinfo4')
-            .int8('numComments')
-            .int8('flags')
-            //  :TODO: does this need to be optional?
-            .buffer('tinfos', { length: 22 } )  //  SAUCE 00.5
-            .parse(data.slice(data.length - SAUCE_SIZE));
     } catch(e) {
         return cb(Errors.Invalid('Invalid SAUCE record'));
     }
 
-
     if(!SAUCE_ID.equals(sauceRec.id)) {
         return cb(Errors.DoesNotExist('No SAUCE record present'));
     }

core/servers/login/telnet.js

@@ -192,6 +192,18 @@ OPTION_IMPLS[OPTIONS.SUPPRESS_GO_AHEAD]     = function(bufs, i, event) {
     return event;
 };
 
+const TermTypeCmdParser = new Parser()
+    .uint8('iac1')
+    .uint8('sb')
+    .uint8('opt')
+    .uint8('is')
+    .array('ttype', {
+        type        : 'uint8',
+        readUntil   : b => 255 === b,   //  255=COMMANDS.IAC
+    })
+    //  note we read iac2 above
+    .uint8('se');
+
 OPTION_IMPLS[OPTIONS.TERMINAL_TYPE] = function(bufs, i, event) {
     if(event.commandCode !== COMMANDS.SB) {
         OPTION_IMPLS.NO_ARGS(bufs, i, event);
@@ -208,18 +220,7 @@ OPTION_IMPLS[OPTIONS.TERMINAL_TYPE] = function(bufs, i, event) {
 
         let ttypeCmd;
         try {
-            ttypeCmd = new Parser()
+            ttypeCmd = TermTypeCmdParser.parse(bufs.toBuffer());
-                .uint8('iac1')
-                .uint8('sb')
-                .uint8('opt')
-                .uint8('is')
-                .array('ttype', {
-                    type        : 'uint8',
-                    readUntil   : b => 255 === b,   //  255=COMMANDS.IAC
-                })
-                //  note we read iac2 above
-                .uint8('se')
-                .parse(bufs.toBuffer());
         } catch(e) {
             Log.debug( { error : e }, 'Failed parsing TTYP telnet command');
             return event;
@@ -242,6 +243,15 @@ OPTION_IMPLS[OPTIONS.TERMINAL_TYPE] = function(bufs, i, event) {
     return event;
 };
 
+const NawsCmdParser = new Parser()
+    .uint8('iac1')
+    .uint8('sb')
+    .uint8('opt')
+    .uint16be('width')
+    .uint16be('height')
+    .uint8('iac2')
+    .uint8('se');
+
 OPTION_IMPLS[OPTIONS.WINDOW_SIZE] = function(bufs, i, event) {
     if(event.commandCode !== COMMANDS.SB) {
         OPTION_IMPLS.NO_ARGS(bufs, i, event);
@@ -253,15 +263,7 @@ OPTION_IMPLS[OPTIONS.WINDOW_SIZE] = function(bufs, i, event) {
 
         let nawsCmd;
         try {
-            nawsCmd = new Parser()
+            nawsCmd = NawsCmdParser.parse(bufs.splice(0, 9).toBuffer());
-                .uint8('iac1')
-                .uint8('sb')
-                .uint8('opt')
-                .uint16be('width')
-                .uint16be('height')
-                .uint8('iac2')
-                .uint8('se')
-                .parse(bufs.splice(0, 9).toBuffer());
         } catch(e) {
             Log.debug( { error : e }, 'Failed parsing NAWS telnet command');
             return event;
@@ -282,6 +284,18 @@ OPTION_IMPLS[OPTIONS.WINDOW_SIZE] = function(bufs, i, event) {
 //  Build an array of delimiters for parsing NEW_ENVIRONMENT[_DEP]
 //const NEW_ENVIRONMENT_DELIMITERS = _.values(NEW_ENVIRONMENT_COMMANDS);
 
+const EnvCmdParser = new Parser()
+    .uint8('iac1')
+    .uint8('sb')
+    .uint8('opt')
+    .uint8('isOrInfo')  //  IS=initial, INFO=updates
+    .array('envBlock', {
+        type : 'uint8',
+        readUntil   : b => 255 === b,   //  255=COMMANDS.IAC
+    })
+    //  note we consume IAC above
+    .uint8('se');
+
 //  Handle the deprecated RFC 1408 & the updated RFC 1572:
 OPTION_IMPLS[OPTIONS.NEW_ENVIRONMENT_DEP]   =
 OPTION_IMPLS[OPTIONS.NEW_ENVIRONMENT]       = function(bufs, i, event) {
@@ -306,18 +320,7 @@ OPTION_IMPLS[OPTIONS.NEW_ENVIRONMENT]       = function(bufs, i, event) {
 
         let envCmd;
         try {
-            envCmd = new Parser()
+            envCmd = EnvCmdParser.parse(bufs.splice(0, bufs.length).toBuffer());
-                .uint8('iac1')
-                .uint8('sb')
-                .uint8('opt')
-                .uint8('isOrInfo')  //  IS=initial, INFO=updates
-                .array('envBlock', {
-                    type : 'uint8',
-                    readUntil   : b => 255 === b,   //  255=COMMANDS.IAC
-                })
-                //  note we consume IAC above
-                .uint8('se')
-                .parse(bufs.splice(0, bufs.length).toBuffer());
         } catch(e) {
             Log.debug( { error : e }, 'Failed parsing NEW-ENVIRON telnet command');
             return event;