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middleware.js
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middleware.js
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try { var config = require("./config.json") }
catch (exception) { }
var pollslow, pollfast, polltick, pollsleep, blocks_from_top;
var mongo_db, mongo_url, base_url, debug_level;
// polling configurations
if (config && config.pollslow) { pollslow = config.pollslow; } else { pollslow = 1000; }
if (config && config.pollfast) { pollfast = config.pollfast; } else { pollfast = 0; }
if (config && config.polltick) { polltick = config.polltick; } else { polltick = 500; }
if (config && config.pollsleep) { pollsleep = config.pollsleep; } else { pollsleep = 30000; }
if (config && config.blocks_from_top) { blocks_from_top = config.blocks_from_top; } else { blocks_from_top = 1; }
//middleware configurations
if (config && config.mongo_db) { mongo_db = config.mongo_db; } else { mongo_db = "middleware"; }
if (config && config.mongo_url) { mongo_url = config.mongo_url; } else { mongo_url = "mongodb://127.0.0.1:27017"; }
if (config && config.base_url) { base_url = config.base_url; } else { base_url = "http://127.0.0.1:3013"; }
if (config && config.debug_level) { debug_level = config.debug_level; } else { debug_level = 1; }
// calculated variables
const base_block=base_url+"/v2/generations/height/";
const base_microblock=base_url+"/v2/micro-blocks/hash/";
const top_block=base_url+"/v2/key-blocks/current";
// dependencies: mongodb request
const MongoClient = require("mongodb").MongoClient;
const client = new MongoClient(mongo_url,{ useNewUrlParser: true, useUnifiedTopology: true });
var request = require("request");
var status = {}; //status variable
status.keyblocks = {};
status.microblocks = {};
status.transactions = {};
status.keyblocks.current = 0;
status.keyblocks.top = 0;
status.reset = {};
status.reset.block = 0;
status.reset.retry = 1;
var keyblocks, microblocks, transactions, pending;
client.connect(function(err) {
if(!err) {
if(debug_level>0) console.log("Connected successfully to Mongo server");
keyblocks = client.db(mongo_db).collection("keyblocks");
microblocks = client.db(mongo_db).collection("microblocks");
transactions = client.db(mongo_db).collection("transactions");;
pending = client.db(mongo_db).collection("pending");;
/*
async function clearMe() {
for(i = 395000; i<=400000; i++)
{
await clearBlockData(i);
}
process.exit()
} //clearMe()
*/
setInterval(retryFailKeyblocks, pollsleep)
getBlock(getBlockLoop);
getTopBlock(getTopBlockLoop);
getMicroBlockLoop();
getTransactionLoop();
cleanUpPendingLoop();
calcKeyblocksLoop();
} else {
if(debug_level>0) console.log(err);
process.exit();
}
});
function getTopBlockLoop() { setTimeout(function() { getTopBlock(getTopBlockLoop); },pollsleep); }
function getBlockLoop() { setTimeout(function() { getBlock(getBlockLoop); },pollslow); }
function getMicroBlockLoop() { setTimeout(function() { getMicroBlock(getMicroBlockLoop); },polltick); }
function getTransactionLoop() { setTimeout(function() { getTransaction(getTransactionLoop); }, polltick); }
function cleanUpPendingLoop() { setTimeout(function() { cleanUpPending(cleanUpPendingLoop); }, polltick); }
function calcKeyblocksLoop() { setTimeout(function() { calcKeyblocks(calcKeyblocksLoop); }, polltick); }
function getTopBlock(release) {
if(debug_level>1) console.log("getTopBlock");
try {
request(top_block, function(error,response,body) {
if(!error && body) {
var parsed=JSON.parse(body);
status.keyblocks.top = parsed.height;
} else {
console.log("getTopBlock" + error);
}
release();
});
}
catch(exception) {
if(debug_level>0) console.log("Temporary error getting top block.");
release();
}
}
function getBlock(release) { //checks the current block height in the chain
if(debug_level>1) console.log("getBlock");
keyblocks.find({}).sort({"_id":-1}).limit(1).toArray(function(err, docs){
if(!err){
if(docs.length == 1) {
status.keyblocks.current = docs[0].key_block.height+1;
} else {
status.keyblocks.current = 0
}
if(status.keyblocks.current<status.keyblocks.top) { //we want to be 1 block behind so we give the microblocks time to be gathered
requestBlock(status.keyblocks.current,release);
} else {
release();
}
} else {
release();
}
});
}
function requestBlock(height, release) {
request(base_block+height, function(error,response,body) {
if(!error) {
var parsedblock
try {
parsedblock = JSON.parse(body);
}
catch(exception) {
console.log(exception);
releae();
}
if(!parsedblock.reason) {
parsedblock._id=parsedblock.key_block.height;
if(parsedblock.micro_blocks.length==0) {
parsedblock.txs_count=0;
//parsedblock.processed=true;
} else {
for(index in parsedblock.micro_blocks) {
var pendingObj = {};
pendingObj._id = parsedblock.micro_blocks[index];
pendingObj.height = parsedblock.key_block.height;
pendingObj.th = true;
pendingObj.mh = true;
pending.insertOne(pendingObj, function(error, docs) {
if(!error) {
if(debug_level>0) console.log(parsedblock.key_block.height, "new microblock", parsedblock.micro_blocks.length, docs.ops[0]._id);
}
else {
//console.log(error.errmsg);
}
});
}
}
keyblocks.insertOne(parsedblock, function(error, doc) {
if(!error) {
if(debug_level>0) console.log(new Date(parsedblock.key_block.time), parsedblock.key_block.height, status.keyblocks.top);
//status.keyblocks.current = parsedblock.key_block.height; //Not needed, but useful.
} else {
console.log(error.errmsg, "getBlockData");
}
release();
});
} else {
console.log("There was an error:", parsedblock.reason);
release();
}
} else {
console.log(error, "while requesting body for", height)
requestBlock(height, release);
}
});
}
function getMicroBlock(release) {
if(debug_level>1) console.log("getMicroBlock");
var parsedmicro;
pending.find({mh:true}).limit(1).sort({"height":1}).toArray(function(err, doc) {
if(!err && doc.length==1) {
//status.microblocks.current = doc[0].height;
request(base_microblock+doc[0]._id+"/header", function(error,response,body) {
if(!error && body) {
try {
parsedmicro=JSON.parse(body);
if(!parsedmicro.reason) {
parsedmicro._id=parsedmicro.hash;
microblocks.insertOne(parsedmicro, function(error, docs) {
if(!error) {
if(debug_level>0) console.log(parsedmicro.height, "getMicroBlock", parsedmicro.hash);
} else {
console.log(error.errmsg, "getMicroBlock");
console.log(parsedmicro.hash)
microblocks.findOne({_id:parsedmicro.hash},(txerr, txdoc) => {
if(!txerr) {
console.log(doc, parsedmicro, txdoc)
// clearBlockData(txdoc.block_height)
}
})
}
pending.updateOne({_id:doc[0]._id},{$set:{mh:false,time:parsedmicro.time}},function(error, numModified) { release(); });
});
} else {
pending.updateOne({_id:doc[0]._id},{$set:{mh:"error"}},function(error, numModified) { release(); });
//console.log("mh header error", doc[0]._id);
}
} catch(exception) {
release();
return;
}
}
});
} else {
release();
}
});
}
function getTransaction(release) {
if(debug_level>1) console.log("getTransaction");
var parsedtx;
pending.find({th:true,time:{$exists:true}}).limit(1).sort({"height":1}).toArray(function(err, doc) {
if(!err && doc.length==1) {
//status.microblocks.current = doc[0].height;
request(base_microblock+doc[0]._id+"/transactions", function(error,response,body) {
if(!error && body) {
try {
parsedtx=JSON.parse(body);
//console.log(parsedtx.transactions);
if(!parsedtx.reason) {
for(index in parsedtx.transactions) { //updating changes in the transaction for faster indexing
parsedtx.transactions[index].time = doc[0].time;
parsedtx.transactions[index]._id = parsedtx.transactions[index].hash;
}
if(parsedtx.transactions.length > 0) {
transactions.insertMany(parsedtx.transactions, function(error, docs) {
if(!error) {
for(index in docs.ops) {
if(debug_level>0) console.log(docs.ops[index].block_height, "getTransaction", docs.ops.length, docs.ops[index].hash);
}
status.transactions.current = doc[0].height;
} else {
//if transction exist check if the transaction has the correct height
//if the height is not the same destroy clear both blocks and let it resync
//console.log(doc[0].height, 'clearBlockData', "getTransaction", status.transactions.current);
//console.log(error, parsedtx)
//console.log(error.result.result.writeErrors[0].err.op.block_height, "Was cleared")
//transactions.findOne({_id:error.result.result.writeErrors[0].err.op.hash},(txerr, txdoc) => {
//if(!txerr) {
//console.log(doc, parsedtx, txdoc)
//clearBlockData(txdoc.block_height)
//process.exit()
//}
//})
//TODO
}
pending.updateOne({_id:doc[0]._id},{$set:{th:false}},function(error, numModified) { release(); });
});
} else {
//microblock is empty, no transactions to gather from this block.
pending.updateOne({_id:doc[0]._id},{$set:{th:false}},function(error, numModified) { release(); });
}
} else {
//pending.updateOne({_id:doc[0]._id},{$set:{th:"error"}},function(error, numModified) { release(); });
}
} catch(exception) {
release();
return;
}
} else {
release();
}
});
} else {
release();
}
});
}
function cleanUpPending(release) {
pending.find({th:false,mh:false}).sort({height:1}).limit(1).toArray(function(error, doc) { //YEA
if(!error && doc.length>0 && doc[0].height<status.keyblocks.current) {
transactions.countDocuments({block_hash:doc[0]._id},function(error, count) {
if(error) { console.log(error); }
microblocks.updateOne({_id:doc[0]._id},{$set:{txs_count:count}},function(error, numModified) {
if(error) { console.log(error) }
else {
pending.deleteOne({_id:doc[0]._id},function(error, docs) {
if(error) { console.log(error) }
release();
});
}
});
});
} else {
release();
}
});
}
function calcKeyblocks(release) {
if(debug_level>1) console.log("calcKeyblocks");
keyblocks.find({_id:{$lt:status.keyblocks.current},txs_count:{$exists:false}}).sort({_id:1}).limit(1).toArray(function(error, doc){
if(!error && doc.length==1) {
//status.microblocks.current = doc[0].key_block.height-1;
pending.countDocuments({ height: doc[0].key_block.height, th: true },function (error, count) {
if(!error && count==0) {
transactions.countDocuments({ block_height: doc[0].key_block.height }, function(error,result) {
if(!error) {
if(debug_level>0) console.log(doc[0].key_block.height,"found",result,"transactions");
keyblocks.updateOne({_id:doc[0].key_block.height},{$set:{txs_count:result}},function(error,numUpdated) {
release();
});
} else {
if(result==0 && doc[0].key_block.height+20<status.keyblocks.top) {
console.log(doc[0].key_block.height, 'clearBlockData', 'called from calckeyblocks')
if ( status.reset.block >= doc[0].key_block.height ) {
console.log(doc[0].key_block.height, 'clearBlockData', 'retry++')
status.reset.retry++
} else {
console.log(doc[0].key_block.height, 'clearBlockData', 'retry=1')
status.reset.retry = 1
}
//for ( var index = 0; index <= status.reset.retry; index++ ) {
console.log(doc[0].key_block.height, 'clearBlockData', doc[0].key_block.height-index)
clearBlockData(doc[0].key_block.height)
//}
status.reset.block = doc[0].key_block.height
}
release();
}
});
} else {
release();
}
});
} else {
release();
}
});
}
function clearBlockData(blockHeight) {
keyblocks.deleteOne({_id:blockHeight},function(error, docs) {});
microblocks.deleteMany({height:blockHeight},function(error, docs) {});
transactions.deleteMany({block_height:blockHeight},function(error, docs) {});
pending.deleteMany({height:blockHeight},function(error,docs) {});
requestBlock(blockHeight, function(blockHeight) {});
console.log(blockHeight, "was cleared.")
}
function retryFailKeyblocks() {
pending.find({ mh: "error"}).sort({height:1}).limit(1).toArray(function(error, results) {
for(i in results) {
if (results[i].height > status.keyblocks.top - 5000) {
clearBlockData(results[i].height)
}
}
});
keyblocks.find({txs_count:{$exists:false}}).sort({_id:1}).limit(1).toArray(function(error, results) {
for(i in results) {
pending.countDocuments({height:results[i]._id},function(error, count) {
if(!error && count==0 && results[i].height > status.keyblocks.top - 5000) {
clearBlockData(results[i]._id)
}
});
}
});
keyblocks.find({micro_blocks: { $not: {$size: 0}}, txs_count: 0}).sort({_id:1}).limit(1).toArray(function(error, results) {
for(i in results) {
pending.countDocuments({height:results[i]._id},function(error, count) {
if(!error && count==0 && results[i].height > status.keyblocks.top - 5000) {
clearBlockData(results[i]._id)
}
});
}
});
}
setInterval(function() {
if(debug_level>=0) {
text = (new Date()).toISOString()+" KB:{";
if(status.microblocks.current) text += "pro:"+status.microblocks.current+",";
text += "cur:"+status.keyblocks.current+",top:"+status.keyblocks.top+"}";
if(status.microblocks.processed) text += " MB:{pro:"+status.microblocks.processed;
if(status.microblocks.pending) text += ",pnd:"+status.microblocks.pending;
if(status.microblocks.processed || status.microblocks.pending) text += "}";
if(status.transactions.processed) text += " TX:"+status.transactions.processed;
console.log(text);
}
},pollsleep*10);
function createIndexesCallback(error, result) {
if(error) {
console.log("Index creation Error: '", error, "'")
}
}
function createIndexes() {
keyblocks.createIndex({_id: 1}, createIndexesCallback)
keyblocks.createIndex({"key_block.beneficiary": 1}, createIndexesCallback)
keyblocks.createIndex({"key_block.hash": 1}, {unique: true}, createIndexesCallback)
keyblocks.createIndex({"key_block.height": 1}, {unique: true}, createIndexesCallback)
keyblocks.createIndex({"key_block.time": 1}, createIndexesCallback)
keyblocks.createIndex({"txs_count": 1}, createIndexesCallback)
microblocks.createIndex({_id: 1}, createIndexesCallback)
microblocks.createIndex({height: 1}, createIndexesCallback)
microblocks.createIndex({time: 1}, createIndexesCallback)
transactions.createIndex({_id: 1}, createIndexesCallback)
transactions.createIndex({block_hash: 1}, createIndexesCallback)
transactions.createIndex({block_height: -1}, createIndexesCallback)
transactions.createIndex({block_height: 1, time: 1}, createIndexesCallback)
transactions.createIndex({block_height: 1}, createIndexesCallback)
transactions.createIndex({time: -1}, createIndexesCallback)
transactions.createIndex({time: 1}, createIndexesCallback)
transactions.createIndex({"tx.account_id": 1}, createIndexesCallback)
transactions.createIndex({"tx.account_id": 1, block_height: -1}, createIndexesCallback)
transactions.createIndex({"tx.recipient_id": 1}, createIndexesCallback)
transactions.createIndex({"tx.recipient_id": 1, block_height: -1}, createIndexesCallback)
transactions.createIndex({"tx.sender_id": 1}, createIndexesCallback)
transactions.createIndex({"tx.sender_id": 1, block_height: -1}, createIndexesCallback)
transactions.createIndex({"tx.type": 1}, createIndexesCallback)
pending.createIndex({_id: 1}, createIndexesCallback)
pending.createIndex({height: 1}, createIndexesCallback)
pending.createIndex({mh: 1, height: 1}, createIndexesCallback)
pending.createIndex({mh:1, time: 1}, createIndexesCallback)
pending.createIndex({mh: 1, time: 1, height: 1}, createIndexesCallback)
pending.createIndex({th: 1, height: 1}, createIndexesCallback)
pending.createIndex({th: 1, time: 1}, createIndexesCallback)
pending.createIndex({th: 1, time: 1, height: 1}, createIndexesCallback)
pending.createIndex({time: 1}, createIndexesCallback)
}