Use Buffer type for vector in error encode/decode

lib/messages.js

@@ -282,6 +282,7 @@ var inv = exports.inv = {
    */
   encodePayload: function(inventory) {
     assert(inventory.length <= 50000, "Too many inventory entires");
+    // TODO(Kagami): Validate vectors length.
     var bufs = [structs.var_int.encode(inventory.length)].concat(inventory);
     return Buffer.concat(bufs);
   },
@@ -378,18 +379,28 @@ var error = exports.error = {
     assert(buf.length >= 4, "Buffer is too small");
     var decodedFatal = structs.var_int.decode(buf);
     var decodedBanTime = structs.var_int.decode(decodedFatal.rest);
-    var decodedVector = structs.var_str.decode(decodedBanTime.rest);
+
-    var decodedErrorText = structs.var_str.decode(decodedVector.rest);
+    var decodedVectorLength = structs.var_int.decode(decodedBanTime.rest);
+    // NOTE(Kagami): Inventory vector should be only 32-byte in size but
+    // currently we don't ensure it.
+    var vectorLength = decodedVectorLength.value;
+    var rest = decodedVectorLength.rest;
+    assert(rest.length >= vectorLength, "Buffer is too small");
+    var vector = new Buffer(vectorLength);
+    rest.copy(vector);
+    rest = rest.slice(vectorLength);
+
+    var decodedErrorText = structs.var_str.decode(rest);
     var length = (
       decodedFatal.length +
       decodedBanTime.length +
-      decodedVector.length +
+      decodedVectorLength.length + vectorLength +
       decodedErrorText.length
     );
     return {
       fatal: decodedFatal.value,
       banTime: decodedBanTime.value,
-      vector: decodedVector.str,
+      vector: vector,
       errorText: decodedErrorText.str,
       // Real data length.
       length: length,
@@ -414,13 +425,14 @@ var error = exports.error = {
   encodePayload: function(opts) {
     var fatal = opts.fatal || error.WARNING;
     var banTime = opts.banTime || 0;
-    var vector = opts.vector || "";
+    // TODO(Kagami): Validate vector length.
-    var errorText = opts.errorText || "";
+    var vector = opts.vector || new Buffer(0);
     return Buffer.concat([
       structs.var_int.encode(fatal),
       structs.var_int.encode(banTime),
-      structs.var_str.encode(vector),
+      structs.var_int.encode(vector.length),
-      structs.var_str.encode(errorText),
+      vector,
+      structs.var_str.encode(opts.errorText),
     ]);
   },
 };

lib/structs.js

@@ -821,7 +821,7 @@ exports.inv_vect = {
   /**
    * Encode inventory vector.
    * @param {Buffer} buf - Payload to calculate the inventory vector for
-   * @return {Buffer} Encoded `inv_vect`.
+   * @return {Buffer} A 32-byte encoded `inv_vect`.
    */
   encode: function(buf) {
     return bmcrypto.sha512(bmcrypto.sha512(buf)).slice(0, 32);

tests/unit.js

@@ -576,21 +576,22 @@ describe("Message types", function() {
       var res = error.decode(encoded);
       expect(res.fatal).to.equal(0);
       expect(res.banTime).to.equal(0);
-      expect(res.vector).to.equal("");
+      expect(res.vector).to.have.length(0);
       expect(res.errorText).to.equal("test");
       expect(res.length).to.equal(8);
 
+      var vector = inv_vect.encode(Buffer("test"));
       var res = error.decode(error.encode({
         fatal: error.FATAL,
         banTime: 120,
-        vector: "123",
+        vector: vector,
         errorText: "fatal error",
       }));
       expect(res.fatal).to.equal(2);
       expect(res.banTime).to.equal(120);
-      expect(res.vector).to.equal("123");
+      expect(bufferEqual(res.vector, vector)).to.be.true;
       expect(res.errorText).to.equal("fatal error");
-      expect(res.length).to.equal(18);
+      expect(res.length).to.equal(47);
     });
   });
 });