mirror of https://github.com/Revertron/Alfis
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836 lines
33 KiB
Rust
836 lines
33 KiB
Rust
use std::cell::RefCell;
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use std::collections::{HashSet, HashMap};
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use std::fs;
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use std::path::Path;
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use chrono::Utc;
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#[allow(unused_imports)]
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use log::{debug, error, info, trace, warn};
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use sqlite::{Connection, State, Statement};
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use crate::{Block, Bytes, Keystore, Transaction, check_domain, get_domain_zone, is_yggdrasil_record, from_hex};
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use crate::commons::constants::*;
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use crate::blockchain::types::{BlockQuality, MineResult, Options};
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use crate::blockchain::types::BlockQuality::*;
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use crate::blockchain::hash_utils::*;
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use crate::settings::Settings;
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use crate::keys::check_public_key_strength;
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use std::cmp::max;
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use crate::blockchain::transaction::{ZoneData, DomainData};
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use std::ops::Deref;
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use crate::blockchain::types::MineResult::*;
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use crate::event::Event;
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const DB_NAME: &str = "blockchain.db";
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const TEMP_DB_NAME: &str = "temp.db";
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const SQL_CREATE_TABLES: &str = include_str!("sql/create_db.sql");
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const SQL_ADD_BLOCK: &str = "INSERT INTO blocks (id, timestamp, version, difficulty, random, nonce, 'transaction',\
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prev_block_hash, hash, pub_key, signature) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);";
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const SQL_REPLACE_BLOCK: &str = "UPDATE blocks SET timestamp = ?, version = ?, difficulty = ?, random = ?, nonce = ?, 'transaction' = ?,\
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prev_block_hash = ?, hash = ?, pub_key = ?, signature = ? WHERE id = ?;";
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const SQL_GET_LAST_BLOCK: &str = "SELECT * FROM blocks ORDER BY id DESC LIMIT 1;";
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const SQL_GET_FIRST_BLOCK_FOR_KEY: &str = "SELECT id FROM blocks WHERE pub_key = ? LIMIT 1;";
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const SQL_ADD_DOMAIN: &str = "INSERT INTO domains (id, timestamp, identity, confirmation, data, pub_key) VALUES (?, ?, ?, ?, ?, ?)";
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const SQL_ADD_ZONE: &str = "INSERT INTO zones (id, timestamp, identity, confirmation, data, pub_key) VALUES (?, ?, ?, ?, ?, ?)";
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const SQL_DELETE_DOMAIN: &str = "DELETE FROM domains WHERE id = ?";
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const SQL_DELETE_ZONE: &str = "DELETE FROM zones WHERE id = ?";
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const SQL_GET_BLOCK_BY_ID: &str = "SELECT * FROM blocks WHERE id=? LIMIT 1;";
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const SQL_GET_LAST_FULL_BLOCK: &str = "SELECT * FROM blocks WHERE `transaction`<>'' ORDER BY id DESC LIMIT 1;";
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const SQL_GET_LAST_FULL_BLOCK_FOR_KEY: &str = "SELECT * FROM blocks WHERE `transaction`<>'' AND pub_key = ? ORDER BY id DESC LIMIT 1;";
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const SQL_GET_DOMAIN_PUBLIC_KEY_BY_ID: &str = "SELECT pub_key FROM domains WHERE identity = ? ORDER BY id DESC LIMIT 1;";
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const SQL_GET_ZONE_PUBLIC_KEY_BY_ID: &str = "SELECT pub_key FROM zones WHERE identity = ? ORDER BY id DESC LIMIT 1;";
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const SQL_GET_DOMAIN_BY_ID: &str = "SELECT * FROM domains WHERE identity = ? ORDER BY id DESC LIMIT 1;";
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const SQL_GET_ZONES: &str = "SELECT data FROM zones;";
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const SQL_GET_OPTIONS: &str = "SELECT * FROM options;";
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pub struct Chain {
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origin: Bytes,
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last_block: Option<Block>,
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last_full_block: Option<Block>,
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max_height: u64,
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db: Connection,
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zones: RefCell<HashSet<String>>,
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}
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impl Chain {
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pub fn new(settings: &Settings) -> Self {
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let origin = settings.get_origin();
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let db = sqlite::open(DB_NAME).expect("Unable to open blockchain DB");
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let zones = RefCell::new(HashSet::new());
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let mut chain = Chain { origin, last_block: None, last_full_block: None, max_height: 0, db, zones };
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chain.init_db();
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chain
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}
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/// Reads options from DB or initializes and writes them to DB if not found
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fn init_db(&mut self) {
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let options = self.get_options();
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if !self.origin.is_zero() && !options.origin.is_empty() && self.origin.to_string() != options.origin {
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self.clear_db();
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}
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if options.version < DB_VERSION {
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self.migrate_db(options.version, DB_VERSION);
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}
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// Trying to get last block from DB to check its version
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// If some block loaded we check its version and determine if we need some migration
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if let Some(block) = self.load_last_block() {
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// Cache some info
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self.last_block = Some(block.clone());
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if block.transaction.is_some() {
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self.last_full_block = Some(block);
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} else {
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self.last_full_block = self.get_last_full_block(None);
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}
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}
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}
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fn load_last_block(&mut self) -> Option<Block> {
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match self.db.prepare(SQL_GET_LAST_BLOCK) {
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Ok(mut statement) => {
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let mut result = None;
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while statement.next().unwrap() == State::Row {
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match Self::get_block_from_statement(&mut statement) {
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None => {
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error!("Something wrong with block in DB!");
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panic!();
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}
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Some(block) => {
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debug!("Loaded last block: {:?}", &block);
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result = Some(block);
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break;
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}
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}
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}
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result
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}
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Err(e) => {
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info!("No blockchain database found. Creating new. {}", e);
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self.db.execute(SQL_CREATE_TABLES).expect("Error creating DB tables");
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None
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}
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}
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}
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fn migrate_db(&mut self, from: u32, to: u32) {
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debug!("Migrating DB from {} to {}", from, to);
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}
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fn clear_db(&mut self) {
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warn!("Clearing DB");
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// We cannot close DB connection and recreate file,
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// therefore we switch our db to temporary file, delete main DB and switch back.
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// I know that this is a crutch, but this way I don't need to use Option<db> :)
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self.db = sqlite::open(TEMP_DB_NAME).expect("Unable to open temporary blockchain DB");
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let file = Path::new(DB_NAME);
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if fs::remove_file(&file).is_err() {
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panic!("Unable to remove database!");
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}
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self.db = sqlite::open(DB_NAME).expect("Unable to open blockchain DB");
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let file = Path::new(TEMP_DB_NAME);
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let _ = fs::remove_file(&file).is_err();
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}
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fn get_options(&self) -> Options {
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let mut options = Options::empty();
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if let Ok(mut statement) = self.db.prepare(SQL_GET_OPTIONS) {
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while let State::Row = statement.next().unwrap() {
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let name = statement.read::<String>(0).unwrap();
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let value = statement.read::<String>(1).unwrap();
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match name.as_ref() {
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"origin" => options.origin = value,
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"version" => options.version = value.parse().unwrap(),
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_ => {}
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}
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}
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}
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options
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}
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pub fn add_block(&mut self, block: Block) {
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debug!("Adding block:\n{:?}", &block);
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let index = block.index;
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let timestamp = block.timestamp;
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self.last_block = Some(block.clone());
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if block.transaction.is_some() {
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self.last_full_block = Some(block.clone());
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}
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let transaction = block.transaction.clone();
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if self.add_block_to_table(block).is_ok() {
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if let Some(transaction) = transaction {
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self.add_transaction_to_table(index, timestamp, &transaction).expect("Error adding transaction");
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}
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}
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}
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pub fn replace_block(&mut self, index: u64, block: Block) -> sqlite::Result<()> {
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debug!("Replacing block {} with:\n{:?}", index, &block);
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let old_block = self.get_block(index).unwrap();
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if old_block.transaction.is_some() {
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let _ = self.delete_transaction(index);
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}
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let index = block.index;
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let timestamp = block.timestamp;
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self.last_block = Some(block.clone());
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if block.transaction.is_some() {
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self.last_full_block = Some(block.clone());
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}
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let transaction = block.transaction.clone();
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if self.replace_block_in_table(block).is_ok() {
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if let Some(transaction) = transaction {
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self.add_transaction_to_table(index, timestamp, &transaction).expect("Error adding transaction");
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}
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}
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Ok(())
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}
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pub fn update(&mut self, keystore: &Option<Keystore>) -> Option<Event> {
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if self.height() < BLOCK_SIGNERS_START {
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trace!("Too early to start block signings");
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return None;
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}
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if keystore.is_none() {
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trace!("We can't sign blocks without keys");
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return None;
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}
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if self.height() < self.max_height() {
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trace!("No signing while syncing");
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return None;
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}
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let block = self.last_block().unwrap();
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if block.transaction.is_none() {
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trace!("No need to sign signing block");
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return None;
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}
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let keystore = keystore.clone().unwrap().clone();
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let signers: HashSet<Bytes> = self.get_block_signers(&block).into_iter().collect();
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if signers.contains(&keystore.get_public()) {
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info!("We have an honor to mine signing block!");
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let keystore = Box::new(keystore);
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// We start mining sign block after some time, not everyone in the same time
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let start = Utc::now().timestamp() + (rand::random::<i64>() % BLOCK_SIGNERS_START_RANDOM);
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return Some(Event::ActionMineLocker { start, index: block.index + 1, hash: block.hash, keystore });
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} else if !signers.is_empty() {
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info!("Signing block must be mined by other nodes");
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}
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None
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}
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pub fn update_sign_block_for_mining(&self, mut block: Block) -> Option<Block> {
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if let Some(full_block) = &self.last_full_block {
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let sign_count = self.height() - full_block.index;
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if sign_count >= BLOCK_SIGNERS_MIN {
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return None;
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}
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block.index = self.height() + 1;
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block.prev_block_hash = self.last_block.clone().unwrap().hash;
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}
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None
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}
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fn delete_transaction(&mut self, index: u64) -> sqlite::Result<()> {
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let mut statement = self.db.prepare(SQL_DELETE_DOMAIN)?;
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statement.bind(1, index as i64)?;
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statement.next()?;
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let mut statement = self.db.prepare(SQL_DELETE_ZONE)?;
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statement.bind(1, index as i64)?;
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statement.next()?;
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Ok(())
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}
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/// Adds block to blocks table
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fn add_block_to_table(&mut self, block: Block) -> sqlite::Result<State> {
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let mut statement = self.db.prepare(SQL_ADD_BLOCK)?;
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statement.bind(1, block.index as i64)?;
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statement.bind(2, block.timestamp as i64)?;
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statement.bind(3, block.version as i64)?;
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statement.bind(4, block.difficulty as i64)?;
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statement.bind(5, block.random as i64)?;
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statement.bind(6, block.nonce as i64)?;
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match &block.transaction {
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None => { statement.bind(7, "")?; }
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Some(transaction) => {
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statement.bind(7, transaction.to_string().as_str())?;
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}
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}
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statement.bind(8, &**block.prev_block_hash)?;
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statement.bind(9, &**block.hash)?;
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statement.bind(10, &**block.pub_key)?;
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statement.bind(11, &**block.signature)?;
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statement.next()
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}
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/// Replaces block in blocks table on arrival of better block from some fork
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fn replace_block_in_table(&mut self, block: Block) -> sqlite::Result<State> {
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let mut statement = self.db.prepare(SQL_REPLACE_BLOCK)?;
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statement.bind(1, block.timestamp as i64)?;
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statement.bind(2, block.version as i64)?;
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statement.bind(3, block.difficulty as i64)?;
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statement.bind(4, block.random as i64)?;
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statement.bind(5, block.nonce as i64)?;
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match &block.transaction {
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None => { statement.bind(6, "")?; }
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Some(transaction) => {
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statement.bind(6, transaction.to_string().as_str())?;
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}
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}
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statement.bind(7, &**block.prev_block_hash)?;
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statement.bind(8, &**block.hash)?;
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statement.bind(9, &**block.pub_key)?;
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statement.bind(10, &**block.signature)?;
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statement.bind(11, block.index as i64)?;
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statement.next()
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}
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/// Adds transaction to transactions table
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fn add_transaction_to_table(&mut self, index: u64, timestamp: i64, t: &Transaction) -> sqlite::Result<State> {
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let sql = match t.class.as_ref() {
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"domain" => SQL_ADD_DOMAIN,
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"zone" => SQL_ADD_ZONE,
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_ => return Err(sqlite::Error { code: None, message: None })
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};
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let mut statement = self.db.prepare(sql)?;
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statement.bind(1, index as i64)?;
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statement.bind(2, timestamp)?;
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statement.bind(3, &**t.identity)?;
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statement.bind(4, &**t.confirmation)?;
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statement.bind(5, t.data.as_ref() as &str)?;
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statement.bind(6, &**t.pub_key)?;
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statement.next()
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}
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pub fn get_block(&self, index: u64) -> Option<Block> {
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match self.db.prepare(SQL_GET_BLOCK_BY_ID) {
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Ok(mut statement) => {
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statement.bind(1, index as i64).expect("Error in bind");
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while statement.next().unwrap() == State::Row {
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return match Self::get_block_from_statement(&mut statement) {
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None => {
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error!("Something wrong with block in DB!");
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None
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}
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Some(block) => {
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//trace!("Loaded block: {:?}", &block);
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Some(block)
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}
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};
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}
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None
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}
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Err(_) => {
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warn!("Can't find requested block {}", index);
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None
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}
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}
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}
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/// Gets last block that has a Transaction within
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pub fn get_last_full_block(&self, pub_key: Option<&[u8]>) -> Option<Block> {
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if let Some(block) = &self.last_full_block {
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match pub_key {
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None => { return Some(block.clone()); }
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Some(key) => {
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if block.pub_key.deref().eq(key) {
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return Some(block.clone());
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}
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}
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}
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}
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let mut statement = match pub_key {
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None => {
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self.db.prepare(SQL_GET_LAST_FULL_BLOCK).expect("Unable to prepare")
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}
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Some(pub_key) => {
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let mut statement = self.db.prepare(SQL_GET_LAST_FULL_BLOCK_FOR_KEY).expect("Unable to prepare");
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statement.bind(1, pub_key).expect("Unable to bind");
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statement
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}
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};
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while statement.next().unwrap() == State::Row {
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return match Self::get_block_from_statement(&mut statement) {
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None => {
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error!("Something wrong with block in DB!");
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None
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}
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Some(block) => {
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//trace!("Got last full block: {:?}", &block);
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Some(block)
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}
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};
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}
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None
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}
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/// Checks if any domain is available to mine for this client (pub_key)
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pub fn is_domain_available(&self, domain: &str, keystore: &Keystore) -> bool {
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if domain.is_empty() {
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return false;
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}
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let identity_hash = hash_identity(domain, None);
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if !self.is_id_available(&identity_hash, &keystore.get_public(), false) {
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return false;
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}
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let parts: Vec<&str> = domain.rsplitn(2, ".").collect();
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if parts.len() > 1 {
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// We do not support third level domains
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if parts.last().unwrap().contains(".") {
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return false;
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}
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return self.is_zone_in_blockchain(parts.first().unwrap());
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}
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true
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}
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/// Checks if this identity is free or is owned by the same pub_key
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pub fn is_id_available(&self, identity: &Bytes, public_key: &Bytes, zone: bool) -> bool {
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let sql = match zone {
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true => { SQL_GET_ZONE_PUBLIC_KEY_BY_ID }
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false => { SQL_GET_DOMAIN_PUBLIC_KEY_BY_ID }
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};
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let mut statement = self.db.prepare(sql).unwrap();
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statement.bind(1, &***identity).expect("Error in bind");
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while let State::Row = statement.next().unwrap() {
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let pub_key = Bytes::from_bytes(&statement.read::<Vec<u8>>(0).unwrap());
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if !pub_key.eq(public_key) {
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return false;
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}
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}
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true
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}
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pub fn get_zones(&self) -> Vec<ZoneData> {
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let mut map = HashMap::new();
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match self.db.prepare(SQL_GET_ZONES) {
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Ok(mut statement) => {
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while statement.next().unwrap() == State::Row {
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let data = statement.read::<String>(0).unwrap();
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debug!("Got zone data {}", &data);
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if let Ok(zone_data) = serde_json::from_str::<ZoneData>(&data) {
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map.insert(zone_data.name.clone(), zone_data);
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}
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}
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}
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Err(e) => {
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warn!("Can't get zones from DB {}", e);
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}
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}
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let result: Vec<ZoneData> = map.drain().map(|(_, value)| value).collect();
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result
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}
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|
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/// Checks if some zone exists in our blockchain
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pub fn is_zone_in_blockchain(&self, zone: &str) -> bool {
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if self.zones.borrow().contains(zone) {
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return true;
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}
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|
|
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// Checking for existing zone in DB
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let identity_hash = hash_identity(zone, None);
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if self.is_id_in_blockchain(&identity_hash, true) {
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// If there is such a zone
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self.zones.borrow_mut().insert(zone.to_owned());
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return true;
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}
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false
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}
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|
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/// Checks if some id exists in our blockchain
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pub fn is_id_in_blockchain(&self, id: &Bytes, zone: bool) -> bool {
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let sql = match zone {
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true => { SQL_GET_ZONE_PUBLIC_KEY_BY_ID }
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false => { SQL_GET_DOMAIN_PUBLIC_KEY_BY_ID }
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};
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// Checking for existing zone in DB
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let mut statement = self.db.prepare(sql).unwrap();
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statement.bind(1, &***id).expect("Error in bind");
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while let State::Row = statement.next().unwrap() {
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// If there is such a zone
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return true;
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}
|
|
false
|
|
}
|
|
|
|
pub fn can_mine_domain(&self, domain: &str, pub_key: &Bytes) -> MineResult {
|
|
let name = domain.to_lowercase();
|
|
if !check_domain(&name, true) {
|
|
return WrongName;
|
|
}
|
|
let zone = get_domain_zone(&name);
|
|
if !self.is_zone_in_blockchain(&zone) {
|
|
return WrongZone;
|
|
}
|
|
if let Some(transaction) = self.get_domain_transaction(&name) {
|
|
if transaction.pub_key.ne(pub_key) {
|
|
return NotOwned;
|
|
}
|
|
}
|
|
let identity_hash = hash_identity(&name, None);
|
|
if let Some(last) = self.get_last_full_block(Some(&pub_key)) {
|
|
let new_id = !self.is_id_in_blockchain(&identity_hash, false);
|
|
let time = last.timestamp + NEW_DOMAINS_INTERVAL - Utc::now().timestamp();
|
|
if new_id && time > 0 {
|
|
return Cooldown { time }
|
|
}
|
|
}
|
|
|
|
Fine
|
|
}
|
|
|
|
/// Gets full Transaction info for any domain. Used by DNS part.
|
|
pub fn get_domain_transaction(&self, domain: &str) -> Option<Transaction> {
|
|
if domain.is_empty() {
|
|
return None;
|
|
}
|
|
let identity_hash = hash_identity(domain, None);
|
|
|
|
let mut statement = self.db.prepare(SQL_GET_DOMAIN_BY_ID).unwrap();
|
|
statement.bind(1, &**identity_hash).expect("Error in bind");
|
|
while let State::Row = statement.next().unwrap() {
|
|
let timestamp = statement.read::<i64>(1).unwrap();
|
|
if timestamp < Utc::now().timestamp() - DOMAIN_LIFETIME {
|
|
// This domain is too old
|
|
return None;
|
|
}
|
|
let identity = Bytes::from_bytes(&statement.read::<Vec<u8>>(2).unwrap());
|
|
let confirmation = Bytes::from_bytes(&statement.read::<Vec<u8>>(3).unwrap());
|
|
let class = String::from("domain");
|
|
let data = statement.read::<String>(4).unwrap();
|
|
let pub_key = Bytes::from_bytes(&statement.read::<Vec<u8>>(5).unwrap());
|
|
let transaction = Transaction { identity, confirmation, class, data, pub_key };
|
|
debug!("Found transaction for domain {}: {:?}", domain, &transaction);
|
|
if transaction.check_identity(domain) {
|
|
return Some(transaction);
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
pub fn get_domain_info(&self, domain: &str) -> Option<String> {
|
|
match self.get_domain_transaction(domain) {
|
|
None => { None }
|
|
Some(transaction) => { Some(transaction.data) }
|
|
}
|
|
}
|
|
|
|
pub fn get_zone_difficulty(&self, zone: &str) -> u32 {
|
|
let zones = self.get_zones();
|
|
for z in zones.iter() {
|
|
if z.name.eq(zone) {
|
|
return z.difficulty;
|
|
}
|
|
}
|
|
u32::max_value()
|
|
}
|
|
|
|
pub fn last_block(&self) -> Option<Block> {
|
|
self.last_block.clone()
|
|
}
|
|
|
|
pub fn height(&self) -> u64 {
|
|
match self.last_block {
|
|
None => { 0u64 }
|
|
Some(ref block) => {
|
|
block.index
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn last_hash(&self) -> Bytes {
|
|
match &self.last_block {
|
|
None => { Bytes::default() }
|
|
Some(block) => { block.hash.clone() }
|
|
}
|
|
}
|
|
|
|
pub fn next_allowed_full_block(&self) -> u64 {
|
|
match self.last_full_block {
|
|
None => { self.height() + 1 }
|
|
Some(ref block) => {
|
|
if block.index < BLOCK_SIGNERS_START {
|
|
self.height() + 1
|
|
} else {
|
|
max(block.index + BLOCK_SIGNERS_MIN, self.height() + 1)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn max_height(&self) -> u64 {
|
|
self.max_height
|
|
}
|
|
|
|
pub fn update_max_height(&mut self, height: u64) {
|
|
if height > self.max_height {
|
|
self.max_height = height;
|
|
}
|
|
}
|
|
|
|
/// Check if this block can be added to our blockchain
|
|
pub fn check_new_block(&self, block: &Block) -> BlockQuality {
|
|
let timestamp = Utc::now().timestamp();
|
|
if block.timestamp > timestamp + 60 {
|
|
warn!("Ignoring block from the future:\n{:?}", &block);
|
|
return Bad;
|
|
}
|
|
if !check_public_key_strength(&block.pub_key, KEYSTORE_DIFFICULTY) {
|
|
warn!("Ignoring block with weak public key:\n{:?}", &block);
|
|
return Bad;
|
|
}
|
|
let difficulty = match &block.transaction {
|
|
None => {
|
|
if block.index == 1 {
|
|
ZONE_DIFFICULTY
|
|
} else {
|
|
LOCKER_DIFFICULTY
|
|
}
|
|
}
|
|
Some(t) => { self.get_difficulty_for_transaction(&t) }
|
|
};
|
|
if block.difficulty < difficulty {
|
|
warn!("Block difficulty is lower than needed");
|
|
return Bad;
|
|
}
|
|
if hash_difficulty(&block.hash) < block.difficulty {
|
|
warn!("Ignoring block with low difficulty:\n{:?}", &block);
|
|
return Bad;
|
|
}
|
|
if !check_block_hash(block) {
|
|
warn!("Block {:?} has wrong hash! Ignoring!", &block);
|
|
return Bad;
|
|
}
|
|
if !check_block_signature(&block) {
|
|
warn!("Block {:?} has wrong signature! Ignoring!", &block);
|
|
return Bad;
|
|
}
|
|
|
|
let faulty_block_hash = "0000133B790B61460D757E1F1F2D04480C8340D28CA73AE5AF27DBBF60548D00";
|
|
let bytes = Bytes::from_bytes(&from_hex(faulty_block_hash).unwrap());
|
|
if block.hash == bytes {
|
|
warn!("Block {:?} is faulty! Ignoring!", &block);
|
|
return Bad;
|
|
}
|
|
|
|
if let Some(transaction) = &block.transaction {
|
|
// TODO check for zone transaction
|
|
if !self.is_id_available(&transaction.identity, &block.pub_key, false) || !self.is_id_available(&transaction.identity, &block.pub_key, true) {
|
|
warn!("Block {:?} is trying to spoof an identity!", &block);
|
|
return Bad;
|
|
}
|
|
if let Some(last) = self.get_last_full_block(Some(&block.pub_key)) {
|
|
let new_id = !self.is_id_in_blockchain(&transaction.identity, false);
|
|
if new_id && last.timestamp + NEW_DOMAINS_INTERVAL > block.timestamp {
|
|
warn!("Block {:?} is mined too early!", &block);
|
|
return Bad;
|
|
}
|
|
}
|
|
// Check if yggdrasil only quality of zone is not violated
|
|
if let Some(block_data) = transaction.get_domain_data() {
|
|
let zones = self.get_zones();
|
|
for z in &zones {
|
|
if z.name == block_data.zone {
|
|
if z.yggdrasil {
|
|
for record in &block_data.records {
|
|
if !is_yggdrasil_record(record) {
|
|
warn!("Someone mined domain with clearnet records for Yggdrasil only zone!");
|
|
return Bad;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
match &self.last_block {
|
|
None => {
|
|
if !block.is_genesis() {
|
|
warn!("Block is from the future, how is this possible?");
|
|
return Future;
|
|
}
|
|
if !self.origin.is_zero() && block.hash != self.origin {
|
|
warn!("Mining gave us a bad block:\n{:?}", &block);
|
|
return Bad;
|
|
}
|
|
}
|
|
Some(last_block) => {
|
|
if block.timestamp < last_block.timestamp && block.index > last_block.index {
|
|
warn!("Ignoring block with timestamp/index collision:\n{:?}", &block);
|
|
return Bad;
|
|
}
|
|
if last_block.index + 1 < block.index {
|
|
warn!("Block {} arrived too early.", block.index);
|
|
return Future;
|
|
}
|
|
if block.index >= BLOCK_SIGNERS_START {
|
|
// If this block is main, signed part of blockchain
|
|
if !self.is_good_sign_block(&block) {
|
|
return Bad;
|
|
}
|
|
}
|
|
|
|
if block.index <= last_block.index {
|
|
if block.index == last_block.index && last_block.hash == block.hash {
|
|
debug!("Ignoring block {}, we already have it", block.index);
|
|
return Twin;
|
|
}
|
|
if let Some(my_block) = self.get_block(block.index) {
|
|
return if my_block.hash != block.hash {
|
|
warn!("Got forked block {} with hash {:?} instead of {:?}", block.index, block.hash, last_block.hash);
|
|
Fork
|
|
} else {
|
|
debug!("Ignoring block {}, we already have it", block.index);
|
|
Twin
|
|
};
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
Good
|
|
}
|
|
|
|
/// Checks if this block is a good signature block
|
|
fn is_good_sign_block(&self, block: &Block) -> bool {
|
|
if let Some(full_block) = &self.last_full_block {
|
|
let sign_count = self.height() - full_block.index;
|
|
if sign_count < BLOCK_SIGNERS_MIN {
|
|
// Last full block is not locked enough
|
|
if block.transaction.is_some() {
|
|
warn!("Not enough signing blocks over full {} block!", full_block.index);
|
|
return false;
|
|
} else {
|
|
if !self.is_good_signer_for_block(&block, full_block, sign_count) {
|
|
return false;
|
|
}
|
|
}
|
|
} else if sign_count < BLOCK_SIGNERS_ALL && block.transaction.is_none() {
|
|
if !self.is_good_signer_for_block(&block, full_block, sign_count) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
true
|
|
}
|
|
|
|
/// Check if this block's owner is a good candidate to sign last full block
|
|
fn is_good_signer_for_block(&self, block: &Block, full_block: &Block, sign_count: u64) -> bool {
|
|
// If the time for chosen signers is up
|
|
if self.can_sign_by_pos(sign_count, full_block.timestamp, block.timestamp, &block.pub_key) {
|
|
return true;
|
|
}
|
|
// If we got a locker/signing block
|
|
let signers: HashSet<Bytes> = self.get_block_signers(full_block).into_iter().collect();
|
|
if !signers.contains(&block.pub_key) {
|
|
warn!("Ignoring block {} from '{:?}', as wrong signer!", block.index, &block.pub_key);
|
|
return false;
|
|
}
|
|
// If this signers' public key has already locked/signed that block we return error
|
|
for i in (full_block.index + 1)..block.index {
|
|
let signer = self.get_block(i).expect("Error in DB!");
|
|
if signer.pub_key == block.pub_key {
|
|
warn!("Ignoring block {} from '{:?}', already signed by this key", block.index, &block.pub_key);
|
|
return false;
|
|
}
|
|
}
|
|
true
|
|
}
|
|
|
|
/// Gets an id of first block of this public key
|
|
fn get_first_block_id_for_key(&self, key: &Bytes) -> u64 {
|
|
match self.db.prepare(SQL_GET_FIRST_BLOCK_FOR_KEY) {
|
|
Ok(mut statement) => {
|
|
statement.bind(1, &***key).expect("Error in bind");
|
|
while statement.next().unwrap() == State::Row {
|
|
return statement.read::<i64>(0).unwrap() as u64;
|
|
}
|
|
0
|
|
}
|
|
Err(_) => {
|
|
0
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Check if an owner of this public key can sign full block by PoS scheme (be in first 1000 users)
|
|
fn can_sign_by_pos(&self, sign_count: u64, block_time: i64, now: i64, pub_key: &Bytes) -> bool {
|
|
if sign_count < BLOCK_SIGNERS_MIN && block_time - now > BLOCK_SIGNERS_TIME {
|
|
let index = self.get_first_block_id_for_key(&pub_key);
|
|
if index > 0 && index <= BLOCK_POS_SIGNERS {
|
|
return true;
|
|
}
|
|
}
|
|
false
|
|
}
|
|
|
|
fn get_difficulty_for_transaction(&self, transaction: &Transaction) -> u32 {
|
|
match transaction.class.as_ref() {
|
|
"domain" => {
|
|
return match serde_json::from_str::<DomainData>(&transaction.data) {
|
|
Ok(data) => {
|
|
for zone in self.get_zones().iter() {
|
|
if zone.name == data.zone {
|
|
return zone.difficulty;
|
|
}
|
|
}
|
|
u32::max_value()
|
|
}
|
|
Err(_) => {
|
|
warn!("Error parsing DomainData from {:?}", transaction);
|
|
u32::max_value()
|
|
}
|
|
}
|
|
}
|
|
"zone" => { ZONE_DIFFICULTY }
|
|
_ => { u32::max_value() }
|
|
}
|
|
}
|
|
|
|
/// Gets public keys of a node that needs to mine "signature" block above this block
|
|
/// block - last full block
|
|
pub fn get_block_signers(&self, block: &Block) -> Vec<Bytes> {
|
|
let mut result = Vec::new();
|
|
if block.index < BLOCK_SIGNERS_START {
|
|
return result;
|
|
}
|
|
let mut set = HashSet::new();
|
|
let tail = block.signature.get_tail_u64();
|
|
let mut count = 1;
|
|
let window = self.height() - 1; // Without the last block
|
|
while set.len() < BLOCK_SIGNERS_ALL as usize {
|
|
let index = ((tail * count) % window) + 1; // We want it to start from 1
|
|
if let Some(b) = self.get_block(index) {
|
|
if b.pub_key != block.pub_key && !set.contains(&b.pub_key) {
|
|
result.push(b.pub_key.clone());
|
|
set.insert(b.pub_key);
|
|
}
|
|
}
|
|
count += 1;
|
|
}
|
|
trace!("Got signers for block {}: {:?}", block.index, &result);
|
|
result
|
|
}
|
|
|
|
fn get_block_from_statement(statement: &mut Statement) -> Option<Block> {
|
|
let index = statement.read::<i64>(0).unwrap() as u64;
|
|
let timestamp = statement.read::<i64>(1).unwrap();
|
|
let version = statement.read::<i64>(2).unwrap() as u32;
|
|
let difficulty = statement.read::<i64>(3).unwrap() as u32;
|
|
let random = statement.read::<i64>(4).unwrap() as u32;
|
|
let nonce = statement.read::<i64>(5).unwrap() as u64;
|
|
let transaction = Transaction::from_json(&statement.read::<String>(6).unwrap());
|
|
let prev_block_hash = Bytes::from_bytes(statement.read::<Vec<u8>>(7).unwrap().as_slice());
|
|
let hash = Bytes::from_bytes(statement.read::<Vec<u8>>(8).unwrap().as_slice());
|
|
let pub_key = Bytes::from_bytes(statement.read::<Vec<u8>>(9).unwrap().as_slice());
|
|
let signature = Bytes::from_bytes(statement.read::<Vec<u8>>(10).unwrap().as_slice());
|
|
Some(Block::from_all_params(index, timestamp, version, difficulty, random, nonce, prev_block_hash, hash, pub_key, signature, transaction))
|
|
}
|
|
} |