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ship.js
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ship.js
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const WebSocket = require('ws');
const { Serialize } = require('enf-eosjs');
const { getDB, getStartBlock, serialize, deserialize, handleHashesDB, pruneDB } = require("./db");
const { append, annotateIncrementalMerkleTree } = require("./functions");
const { blocksDB, rootDB, statusDB } = getDB();
const { asBinary } = require('lmdb');
class SHIP {
constructor() {
this.abi = null;
this.types = null;
this.blocksQueue = [];
this.inProcessBlocks = false;
this.currentArgs = null;
this.connectionRetries = 0;
this.maxConnectionRetries = 100;
}
start(endpoint){
console.log(`Websocket connecting to ${endpoint}`);
this.ws = new WebSocket(endpoint, { perMessageDeflate: false });
this.ws.on('message', data =>{
//if abi is not set, it means we are receiving an abi
if (!this.abi) {
this.rawabi = data;
this.abi = JSON.parse(data);
this.types = Serialize.getTypesFromAbi(Serialize.createInitialTypes(), this.abi);
//request ship status
return this.send(['get_status_request_v0', {}]);
}
//Receiving blocks
const [type, response] = this.deserialize('result', data);
this[type](response);
});
this.ws.on('close', code => {
console.error(`Websocket disconnected from ${process.env.SHIP_WS} with code ${code}`);
this.abi = null;
this.types = null;
this.blocksQueue = [];
this.inProcessBlocks = false;
if (code !== 1000) this.reconnect();
});
this.ws.on('error', (e) => {console.error(`Websocket error`, e)});
}
disconnect() {
console.log(`Closing connection`);
this.ws.close();
}
reconnect(){
if (this.connectionRetries > this.maxConnectionRetries) return console.error(`Exceeded max reconnection attempts of ${this.maxConnectionRetries}`);
const timeout = Math.pow(2, this.connectionRetries/5) * 1000;
console.log(`Retrying with delay of ${timeout / 1000}s`);
setTimeout(() => { this.start(process.env.SHIP_WS); }, timeout);
this.connectionRetries++;
}
serialize(type, value) {
const buffer = new Serialize.SerialBuffer({ textEncoder: new TextEncoder, textDecoder: new TextDecoder });
Serialize.getType(this.types, type).serialize(buffer, value);
return buffer.asUint8Array();
}
deserialize(type, array) {
const buffer = new Serialize.SerialBuffer({ textEncoder: new TextEncoder, textDecoder: new TextDecoder, array });
return Serialize.getType(this.types, type).deserialize(buffer, new Serialize.SerializerState({ bytesAsUint8Array: true }));
}
send(request) {
this.ws.send(this.serialize('request', request));
}
requestBlocks(requestArgs) {
if (!this.currentArgs) this.currentArgs = {
start_block_num: 0,
end_block_num: 0xffffffff,
max_messages_in_flight: 50,
have_positions: [],
irreversible_only: false,
fetch_block: false,
fetch_traces: false,
fetch_deltas: false,
...requestArgs
};
this.send(['get_blocks_request_v0', this.currentArgs]);
}
async get_status_result_v0(response) {
const start_block_num = await getStartBlock();
console.log("SHIP Lib is at ", response.last_irreversible.block_num);
console.log("Db starting to sync from",start_block_num)
this.requestBlocks({ start_block_num, irreversible_only:false })
}
get_blocks_result_v0(response) {
this.blocksQueue.push(response);
this.processBlocks();
}
async processBlocks() {
if (this.inProcessBlocks) return;
this.inProcessBlocks = true;
while (this.blocksQueue.length) {
let response = this.blocksQueue.shift();
if (response.this_block){
let block_num = response.this_block.block_num;
this.currentArgs.start_block_num = block_num - 50; // replay 25 seconds
}
this.send(['get_blocks_ack_request_v0', { num_messages: 1 }]);
await this.receivedBlock(response);
}
this.inProcessBlocks = false;
}
async receivedBlock(response) {
if (!response.this_block) return;
let block_num = response.this_block.block_num;
let block_id = response.this_block.block_id;
//handle forks
let blockExists = blocksDB.getBinary(block_num);
if (blockExists){
console.log(`overwriting block #${block_num} in lightproof-db`);
let existingBlock
try{ existingBlock = await deserialize(blockExists); }
catch(ex){ console.log("ex",ex, blockExists); }
//remove the hash if not used in another block, or reduce its instance count by 1 to roll back the block
if(existingBlock) for (var node of existingBlock.nodes) await handleHashesDB(node);
}
// }
this.current_block = block_num;
if (!(block_num % 1000)){
const progress = (100 * ((this.current_block) / response.head.block_num)).toFixed(2)
console.log(`SHIP: ${progress}% (${this.current_block}/${response.head.block_num})`);
await pruneDB();
}
await rootDB.transaction(async () => {
let nodes, aliveUntil=0;
//if starting form genesis
if(block_num==1) nodes = [];
//if lightproof-db stored the previous block or starting from a snapshot
else {
let previousBuffer = blocksDB.getBinary(block_num-1);
//if starting from snapshot
if(!previousBuffer){
console.log(`Cannot find previous block #${block_num-1} in lightproof-db`);
process.exit()
}
//if lightproof-db has the previous block nodes
let previous = await deserialize(previousBuffer);
const previousNodeCount = block_num-2
const merkleTree = append(previous.id, previous.nodes, previousNodeCount);
nodes = merkleTree.activeNodes;
const tree = {...merkleTree, nodeCount: block_num-1}
const { blockToEdit } = annotateIncrementalMerkleTree(JSON.parse(JSON.stringify(tree)), false);
if (blockToEdit) aliveUntil = blockToEdit.aliveUntil;
}
var buffer = serialize(block_id, nodes, aliveUntil);
blocksDB.put(block_num, asBinary(buffer));
if (this.currentArgs.irreversible_only) statusDB.put("lib", block_num);
else statusDB.put("lib", block_num - 600);
});
if (this.current_block === this.end_block-1){
console.log(`SHIP done streaming`)
this.disconnect()
}
}
}
module.exports = SHIP