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index.js
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index.js
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const util = require('util')
const EventEmitter = require('events').EventEmitter
const Transaction = require('vaporyjs-tx')
const Block = require('vaporyjs-block')
const vapUtil = require('vaporyjs-util')
const rlp = vapUtil.rlp
const OFFSET = 0x10
const TYPES = {
0x0: 'status',
0x1: 'newBlockHashes',
0x2: 'transactions',
0x3: 'getBlockHashes',
0x4: 'blockHashes',
0x5: 'getBlocks',
0x6: 'blocks',
0x7: 'newBlock',
0x8: 'blockHashesFromNumber'
}
const OFFSETS = {
'status': 0x0,
'newBlockHashes': 0x1,
'transactions': 0x2,
'getBlockHashes': 0x3,
'blockHashes': 0x4,
'getBlocks': 0x5,
'blocks': 0x6,
'newBlock': 0x7,
'blockHashesFromNumber': 0x8
}
var VapWire = module.exports = function (stream) {
// Register as event emitter
EventEmitter.call(this)
var self = this
this.version = 61
this.stream = stream
this.stream._prefix = false
stream.on('data', function (data) {
self.parse(data)
})
stream.on('end', function () {
self._end = true
})
stream.on('error', function () {
self._end = true
})
}
util.inherits(VapWire, EventEmitter)
// parses an array of transactions
function parseTxs (payload) {
var txs = []
for (var i = 0; i < payload.length; i++) {
txs.push(new Transaction(payload[i]))
}
return txs
}
function parseBlocks (payload) {
// blocks
var blocks = []
for (var i = 0; i < payload.length; i++) {
blocks.push(new Block(payload[i]))
}
return blocks
}
// packet parsing methods
var parsingFunc = {
status: function (payload) {
return {
vapVersion: payload[0][0],
networkID: payload[1],
td: payload[2],
bestHash: payload[3],
genesisHash: payload[4]
}
},
transactions: function (payload) {
return parseTxs(payload)
},
getBlockHashes: function (payload) {
return {
hash: payload[0],
maxBlocks: payload[1]
}
},
blockHashes: function (payload) {
return payload
},
getBlocks: function (payload) {
return payload
},
newBlockHashes: function (payload) {
return payload
},
blocks: function (payload) {
return parseBlocks(payload)
},
newBlock: function (payload) {
return {
block: new Block(payload[0]),
td: payload[1]
}
},
blockHashesFromNumber: function (payload) {
return {
startNumber: payload[0],
max: payload[1]
}
}
}
VapWire.prototype.parse = function (data) {
var type = TYPES[data.slice(0, 1)[0] - OFFSET]
// try{
console.log('recieved: ' + type)
var parsed = parsingFunc[type](rlp.decode(data.slice(1)))
if (type === 'status') {
this.status = parsed
}
this.emit(type, parsed)
// }catch(e){
// this.emit('error', e)
// }
}
VapWire.prototype.send = function (type, data, cb) {
var msg = Buffer.concat([new Buffer([type + 16]), rlp.encode(data)])
// console.log(msg.toString('hex'))
this.stream.write(msg, cb)
}
// packet sending methods
VapWire.prototype.sendStatus = function (id, td, bestHash, genesisHash, cb) {
var msg = [
new Buffer([this.version]),
id,
td,
bestHash,
genesisHash
]
this.send(OFFSETS.status, msg, cb)
}
/**
* Specify (a) transaction(s) that the peer should make sure is included on its
* transaction queue.
* @method sendTransactions
* @param {Array.<Transaction>} transaction
* @param {Function} cb
*/
VapWire.prototype.sendTransactions = function (transactions, cb) {
var msg = []
transactions.forEach(function (tx) {
msg.push(tx.serialize())
})
this.send(OFFSETS.transactions, msg, cb)
}
VapWire.prototype.sendGetBlockHashes = function (startHash, max, cb) {
var msg = [startHash, vapUtil.intToBuffer(max)]
this.send(OFFSETS.getBlockHashes, msg, cb)
}
// VapWire.prototype.sendBlockHashes = function(hashes, cb) {
// this.send(OFFSETS.blockHashes, cb)
// }
VapWire.prototype.sendGetBlocks = function (hashes, cb) {
hashes = hashes.slice()
this.send(OFFSETS.getBlocks, hashes, cb)
}
/**
* Specify (a) block(s) that the peer should know about.
* @method sendBlocks
* @param {Array.<Block>} blocks
* @param {Function} cb
*/
VapWire.prototype.sendBlocks = function (blocks, cb) {
var msg = []
blocks.forEach(function (block) {
msg.push(block.serialize())
})
this.send(OFFSETS.blocks, msg, cb)
}
/**
* Specify (a) block(s) that the peer should know about.
* @method sendBlocks
* @param {Array.<Block>} block
* @param {Number} td tottal difficulty
* @param {Function} cb
*/
VapWire.prototype.sendNewBlock = function (block, td, cb) {
var msg = [block.serialize(false), td]
this.send(OFFSETS.newBlock, msg, cb)
}
VapWire.prototype.sendBlockHashesFromNumber = function (startNumber, maxNumber, cb) {
var msg = [startNumber, maxNumber]
this.send(OFFSETS.blockHashesFromNumber, msg, cb)
}
VapWire.prototype.fetchBlockHashes = function (startHash, max, cb) {
this.once('blockHashes', cb)
this.sendGetBlockHashes(startHash, max)
}
VapWire.prototype.fetchBlocks = function (hashes, cb) {
this.once('blocks', cb)
this.sendGetBlocks(hashes)
}