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OOPify bitfields

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This commit is contained in:
Kagami Hiiragi 2015-01-19 02:05:53 +03:00
parent dd7d4315c2
commit 232e06caf2
4 changed files with 80 additions and 58 deletions
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8
lib/address.js
View File

@ -11,7 +11,7 @@ var bufferEqual = require("buffer-equal");
var bs58 = require("bs58");
var assert = require("./util").assert;
var var_int = require("./structs").var_int;
var pubkeyBitfield = require("./structs").pubkeyBitfield;
var PubkeyBitfield = require("./structs").PubkeyBitfield;
var bmcrypto = require("./crypto");
/**
@ -32,10 +32,8 @@ function Address(opts) {
// Merge remained values.
objectAssign(this, opts);
this.stream = this.stream || 1;
if (!this.pubkeyFeatures) {
// Fill up default features.
this.pubkeyFeatures = pubkeyBitfield.encode([pubkeyBitfield.DOES_ACK]);
}
this.pubkeyFeatures = this.pubkeyFeatures ||
PubkeyBitfield().set(PubkeyBitfield.DOES_ACK);
}
/**

8
lib/messages.js
View File

@ -11,6 +11,7 @@
var assert = require("./util").assert;
var structs = require("./structs");
var ServicesBitfield = structs.ServicesBitfield;
var UserAgent = require("./user-agent");
var util = require("./util");
@ -33,7 +34,7 @@ exports.version = {
// 4 + 8 + 8 + 26 + 26 + 8 + (1+) + (1+)
assert(buf.length >= 82, "Buffer is too small");
var protoVersion = buf.readUInt32BE(0, true);
var services = structs.servicesBitfield.decode(buf.slice(4, 12));
var services = ServicesBitfield(buf.slice(4, 12), {copy: true});
var time = util.readTime64BE(buf, 12);
var short = {short: true};
var addrRecv = structs.net_addr.decode(buf.slice(20, 46), short);
@ -67,7 +68,8 @@ exports.version = {
*/
encode: function(opts) {
// Deal with default options.
var services = opts.services || [structs.servicesBitfield.NODE_NETWORK];
var services = opts.services ||
ServicesBitfield().set(ServicesBitfield.NODE_NETWORK);
var time = opts.time || new Date();
var nonce = opts.nonce || exports.version.NONCE;
assert(nonce.length === 8, "Bad nonce");
@ -90,7 +92,7 @@ exports.version = {
});
return Buffer.concat([
protoVersion,
structs.servicesBitfield.encode(services),
services.buffer,
util.writeTime64BE(null, time),
addrRecv,
addrFrom,

84
lib/structs.js
View File

@ -379,7 +379,7 @@ exports.net_addr = {
res.stream = buf.readUInt32BE(8, true);
buf = buf.slice(12);
}
res.services = servicesBitfield.decode(buf.slice(0, 8));
res.services = ServicesBitfield(buf.slice(0, 8), {copy: true});
res.host = inet_ntop(buf.slice(8, 24));
res.port = buf.readUInt16BE(24, true);
return res;
@ -409,8 +409,9 @@ exports.net_addr = {
buf.writeUInt32BE(stream, 8);
shift = 12;
}
var services = opts.services || [servicesBitfield.NODE_NETWORK];
servicesBitfield.encode(services).copy(buf, shift);
var services = opts.services ||
ServicesBitfield().set(ServicesBitfield.NODE_NETWORK);
services.buffer.copy(buf, shift);
inet_pton(opts.host).copy(buf, shift + 8);
buf.writeUInt16BE(opts.port, shift + 24);
return buf;
@ -497,37 +498,58 @@ exports.encrypted = {
};
// Creates bitfield (LSB 0) class of the specified size.
var bitfield = function(size) {
var Bitfield = function(size) {
var bytesize = size / 8;
return {
decode: function(buf) {
assert(buf.length === bytesize, "Bad buffer size");
var features = [];
var index;
for (var i = 0; i < size; i++) {
index = bytesize - Math.floor(i / 8) - 1;
if ((buf[index] & (1 << (i % 8))) !== 0) { // jshint ignore:line
features.push(i);
}
}
return features;
},
encode: function(features) {
var buf = new Buffer(bytesize);
buf.fill(0);
if (!Array.isArray(features)) {
features = [features];
// <https://github.com/fb55/bitfield> is the source of inspiration.
function BitfieldInner(buf, opts) {
if (!(this instanceof BitfieldInner)) {
return new BitfieldInner(buf);
}
features.forEach(function(feature) {
assert(feature >= 0, "Bad feature");
assert(feature <= (size - 1), "Bad feature");
var index = bytesize - Math.floor(feature / 8) - 1;
buf[index] |= 1 << (feature % 8); // jshint ignore:line
opts = opts || {};
if (buf) {
assert(buf.length === bytesize, "Bad buffer size");
if (opts.copy) {
var dup = new Buffer(bytesize);
dup.fill(0);
buf.copy(dup);
buf = dup;
}
} else {
buf = new Buffer(bytesize);
buf.fill(0);
}
this.buffer = buf;
}
BitfieldInner.prototype.get = function(bits) {
if (!Array.isArray(bits)) {
bits = [bits];
}
var buf = this.buffer;
return bits.every(function(bit) {
assert(bit >= 0, "Bit number is too low");
assert(bit < size, "Bit number is too high");
var index = bytesize - Math.floor(bit / 8) - 1;
return (buf[index] & (1 << (bit % 8))) !== 0; // jshint ignore:line
});
return buf;
},
};
BitfieldInner.prototype.set = function(bits) {
if (!Array.isArray(bits)) {
bits = [bits];
}
var buf = this.buffer;
bits.forEach(function(bit) {
assert(bit >= 0, "Bit number is too low");
assert(bit < size, "Bit number is too high");
var index = bytesize - Math.floor(bit / 8) - 1;
buf[index] |= 1 << (bit % 8); // jshint ignore:line
});
return this;
};
return BitfieldInner;
};
/**
@ -537,7 +559,7 @@ var bitfield = function(size) {
* @static
*/
// TODO(Kagami): Document methods.
var servicesBitfield = exports.servicesBitfield = objectAssign(bitfield(64), {
var ServicesBitfield = exports.ServicesBitfield = objectAssign(Bitfield(64), {
/** This is a normal network node. */
NODE_NETWORK: 0,
});
@ -551,7 +573,7 @@ var servicesBitfield = exports.servicesBitfield = objectAssign(bitfield(64), {
// XXX(Kagami): PyBitmessage uses MSB 0 scheme for this bitfield so we
// invert the numberes. See
// <https://github.com/Bitmessage/PyBitmessage/issues/769> for details.
exports.pubkeyBitfield = objectAssign(bitfield(32), {
exports.PubkeyBitfield = objectAssign(Bitfield(32), {
/**
* Receiving node expects that the RIPE hash encoded in their address
* preceedes the encrypted message data of msg messages bound for

36
test.js
View File

@ -14,8 +14,8 @@ var var_int_list = structs.var_int_list;
var net_addr = structs.net_addr;
var inv_vect = structs.inv_vect;
var encrypted = structs.encrypted;
var servicesBitfield = structs.servicesBitfield;
var pubkeyBitfield = structs.pubkeyBitfield;
var ServicesBitfield = structs.ServicesBitfield;
var PubkeyBitfield = structs.PubkeyBitfield;
var messages = bitmessage.messages;
var version = messages.version;
var addr = messages.addr;
@ -209,27 +209,27 @@ describe("Common structures", function() {
res = net_addr.decode(Buffer("0000000054aaf6c000000001000000000000000100000000000000000000ffff7f00000120fc", "hex"));
expect(res.time.getTime()).to.equal(1420490432000);
expect(res.stream).to.equal(1);
expect(res.services).to.have.members([servicesBitfield.NODE_NETWORK]);
expect(res.services.get(ServicesBitfield.NODE_NETWORK)).to.be.true;
expect(res.host).to.equal("127.0.0.1");
expect(res.port).to.equal(8444);
expect(net_addr.decode.bind(null, Buffer("000000000000000100000000000000000000ffff7f00000120fc", "hex"))).to.throw(Error);;
res = net_addr.decode(Buffer("000000000000000100000000000000000000ffff7f00000120fc", "hex"), {short: true});
expect(res.services).to.have.members([servicesBitfield.NODE_NETWORK]);
expect(res.services.get(ServicesBitfield.NODE_NETWORK)).to.be.true;
expect(res.host).to.equal("127.0.0.1");
expect(res.port).to.equal(8444);
res = net_addr.decode(Buffer("000000000000000100000000000000000000000000000001fde8", "hex"), {short: true});
expect(res.services).to.have.members([servicesBitfield.NODE_NETWORK]);
expect(res.services.get(ServicesBitfield.NODE_NETWORK)).to.be.true;
expect(res.host).to.equal("0:0:0:0:0:0:0:1");
expect(res.port).to.equal(65000);
});
it("should encode", function() {
var time = new Date(1420490432000);
expect(net_addr.encode({time: time, stream: 1, services: [servicesBitfield.NODE_NETWORK], host: "127.0.0.1", port: 8444}).toString("hex")).to.equal("0000000054aaf6c000000001000000000000000100000000000000000000ffff7f00000120fc");
expect(net_addr.encode({short: true, services: [servicesBitfield.NODE_NETWORK], host: "127.0.0.1", port: 8444}).toString("hex")).to.equal("000000000000000100000000000000000000ffff7f00000120fc");
expect(net_addr.encode({time: time, stream: 1, services: ServicesBitfield().set(ServicesBitfield.NODE_NETWORK), host: "127.0.0.1", port: 8444}).toString("hex")).to.equal("0000000054aaf6c000000001000000000000000100000000000000000000ffff7f00000120fc");
expect(net_addr.encode({short: true, services: ServicesBitfield().set(ServicesBitfield.NODE_NETWORK), host: "127.0.0.1", port: 8444}).toString("hex")).to.equal("000000000000000100000000000000000000ffff7f00000120fc");
expect(net_addr.encode({short: true, host: "::1", port: 65000}).toString("hex")).to.equal("000000000000000100000000000000000000000000000001fde8");
});
});
@ -265,24 +265,24 @@ describe("Common structures", function() {
});
describe("service features", function() {
it("should decode", function() {
expect(servicesBitfield.decode(Buffer("0000000000000001", "hex"))).to.have.members([servicesBitfield.NODE_NETWORK]);
it("should allow to check bits", function() {
expect(ServicesBitfield(Buffer("0000000000000001", "hex")).get(ServicesBitfield.NODE_NETWORK)).to.be.true;
});
it("should encode", function() {
expect(servicesBitfield.encode([servicesBitfield.NODE_NETWORK]).toString("hex")).to.equal("0000000000000001");
expect(servicesBitfield.encode(servicesBitfield.NODE_NETWORK).toString("hex")).to.equal("0000000000000001");
it("should allow to set bits", function() {
expect(ServicesBitfield().set([ServicesBitfield.NODE_NETWORK]).buffer.toString("hex")).to.equal("0000000000000001");
expect(ServicesBitfield().set(ServicesBitfield.NODE_NETWORK).buffer.toString("hex")).to.equal("0000000000000001");
});
});
describe("pubkey features", function() {
it("should decode", function() {
expect(pubkeyBitfield.decode(Buffer("00000003", "hex"))).to.have.members([pubkeyBitfield.DOES_ACK, pubkeyBitfield.INCLUDE_DESTINATION]);
it("should allow to check bits", function() {
expect(PubkeyBitfield(Buffer("00000003", "hex")).get([PubkeyBitfield.DOES_ACK, PubkeyBitfield.INCLUDE_DESTINATION])).to.be.true;
});
it("should encode", function() {
expect(pubkeyBitfield.encode([pubkeyBitfield.INCLUDE_DESTINATION, pubkeyBitfield.DOES_ACK]).toString("hex")).to.equal("00000003");
expect(pubkeyBitfield.encode(pubkeyBitfield.DOES_ACK).toString("hex")).to.equal("00000001");
it("should allow to set bits", function() {
expect(PubkeyBitfield().set([PubkeyBitfield.INCLUDE_DESTINATION, PubkeyBitfield.DOES_ACK]).buffer.toString("hex")).to.equal("00000003");
expect(PubkeyBitfield().set(PubkeyBitfield.DOES_ACK).buffer.toString("hex")).to.equal("00000001");
});
});
});
@ -296,7 +296,7 @@ describe("Message types", function() {
port: 8444,
}));
expect(res.version).to.equal(3);
expect(res.services).to.deep.equal([servicesBitfield.NODE_NETWORK]);
expect(res.services.get(ServicesBitfield.NODE_NETWORK)).to.be.true;
expect(res.time).to.be.instanceof(Date);
expect(res.remoteHost).to.equal("1.2.3.4");
expect(res.remotePort).to.equal(48444);