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query.rs
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query.rs
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use bitcoin::blockdata::transaction::Transaction;
use bitcoin::consensus::encode::deserialize;
use bitcoin::hash_types::{BlockHash, TxMerkleNode, Txid};
use bitcoin::hashes::hex::ToHex;
use bitcoin::hashes::sha256d::Hash as Sha256dHash;
use bitcoin::hashes::Hash;
use serde_json::Value;
use sha2::{Digest, Sha256};
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
use crate::app::App;
use crate::cache::TransactionCache;
use crate::errors::*;
use crate::index::{compute_script_hash, TxInRow, TxOutRow, TxRow};
use crate::mempool::Tracker;
use crate::metrics::{HistogramOpts, HistogramVec, Metrics};
use crate::store::{ReadStore, Row};
use crate::util::{FullHash, HashPrefix, HeaderEntry};
pub struct FundingOutput {
pub txn_id: Txid,
pub height: u32,
pub output_index: usize,
pub value: u64,
}
type OutPoint = (Txid, usize); // (txid, output_index)
struct SpendingInput {
txn_id: Txid,
height: u32,
funding_output: OutPoint,
value: u64,
}
pub struct Status {
confirmed: (Vec<FundingOutput>, Vec<SpendingInput>),
mempool: (Vec<FundingOutput>, Vec<SpendingInput>),
txn_fees: HashMap<Txid, u64>,
}
fn calc_balance((funding, spending): &(Vec<FundingOutput>, Vec<SpendingInput>)) -> i64 {
let funded: u64 = funding.iter().map(|output| output.value).sum();
let spent: u64 = spending.iter().map(|input| input.value).sum();
funded as i64 - spent as i64
}
pub struct HistoryItem {
height: i32,
tx_hash: Txid,
fee: Option<u64>, // need to be set only for unconfirmed transactions (i.e. height <= 0)
}
impl HistoryItem {
pub fn to_json(&self) -> Value {
let mut result = json!({ "height": self.height, "tx_hash": self.tx_hash.to_hex()});
self.fee.map(|f| {
result
.as_object_mut()
.unwrap()
.insert("fee".to_string(), json!(f))
});
result
}
}
impl Status {
fn funding(&self) -> impl Iterator<Item = &FundingOutput> {
self.confirmed.0.iter().chain(self.mempool.0.iter())
}
fn spending(&self) -> impl Iterator<Item = &SpendingInput> {
self.confirmed.1.iter().chain(self.mempool.1.iter())
}
pub fn confirmed_balance(&self) -> i64 {
calc_balance(&self.confirmed)
}
pub fn mempool_balance(&self) -> i64 {
calc_balance(&self.mempool)
}
pub fn history(&self) -> Vec<HistoryItem> {
let mut txns_map = HashMap::<Txid, i32>::new();
for f in self.funding() {
txns_map.insert(f.txn_id, f.height as i32);
}
for s in self.spending() {
txns_map.insert(s.txn_id, s.height as i32);
}
let mut items: Vec<HistoryItem> = txns_map
.into_iter()
.map(|item| HistoryItem {
height: item.1,
tx_hash: item.0,
fee: self.txn_fees.get(&item.0).cloned(),
})
.collect();
items.sort_unstable_by_key(|item| item.height);
items
}
pub fn unspent(&self) -> Vec<&FundingOutput> {
let mut outputs_map = HashMap::<OutPoint, &FundingOutput>::new();
for f in self.funding() {
outputs_map.insert((f.txn_id, f.output_index), f);
}
for s in self.spending() {
if outputs_map.remove(&s.funding_output).is_none() {
warn!("failed to remove {:?}", s.funding_output);
}
}
let mut outputs = outputs_map
.into_iter()
.map(|item| item.1) // a reference to unspent output
.collect::<Vec<&FundingOutput>>();
outputs.sort_unstable_by_key(|out| out.height);
outputs
}
pub fn hash(&self) -> Option<FullHash> {
let txns = self.history();
if txns.is_empty() {
None
} else {
let mut sha2 = Sha256::new();
for item in txns {
let part = format!("{}:{}:", item.tx_hash.to_hex(), item.height);
sha2.update(part.as_bytes());
}
Some(sha2.finalize().into())
}
}
}
struct TxnHeight {
txn: Transaction,
height: u32,
}
fn merklize<T: Hash>(left: T, right: T) -> T {
let data = [&left[..], &right[..]].concat();
<T as Hash>::hash(&data)
}
fn create_merkle_branch_and_root<T: Hash>(mut hashes: Vec<T>, mut index: usize) -> (Vec<T>, T) {
let mut merkle = vec![];
while hashes.len() > 1 {
if hashes.len() % 2 != 0 {
let last = *hashes.last().unwrap();
hashes.push(last);
}
index = if index % 2 == 0 { index + 1 } else { index - 1 };
merkle.push(hashes[index]);
index /= 2;
hashes = hashes
.chunks(2)
.map(|pair| merklize(pair[0], pair[1]))
.collect()
}
(merkle, hashes[0])
}
// TODO: the functions below can be part of ReadStore.
fn txrow_by_txid(store: &dyn ReadStore, txid: &Txid) -> Option<TxRow> {
let key = TxRow::filter_full(&txid);
let value = store.get(&key)?;
Some(TxRow::from_row(&Row { key, value }))
}
fn txrows_by_prefix(store: &dyn ReadStore, txid_prefix: HashPrefix) -> Vec<TxRow> {
store
.scan(&TxRow::filter_prefix(txid_prefix))
.iter()
.map(|row| TxRow::from_row(row))
.collect()
}
fn txids_by_script_hash(store: &dyn ReadStore, script_hash: &[u8]) -> Vec<HashPrefix> {
store
.scan(&TxOutRow::filter(script_hash))
.iter()
.map(|row| TxOutRow::from_row(row).txid_prefix)
.collect()
}
fn txids_by_funding_output(
store: &dyn ReadStore,
txn_id: &Txid,
output_index: usize,
) -> Vec<HashPrefix> {
store
.scan(&TxInRow::filter(&txn_id, output_index))
.iter()
.map(|row| TxInRow::from_row(row).txid_prefix)
.collect()
}
pub struct Query {
app: Arc<App>,
tracker: RwLock<Tracker>,
tx_cache: TransactionCache,
txid_limit: usize,
duration: HistogramVec,
}
impl Query {
pub fn new(
app: Arc<App>,
metrics: &Metrics,
tx_cache: TransactionCache,
txid_limit: usize,
) -> Arc<Query> {
Arc::new(Query {
app,
tracker: RwLock::new(Tracker::new(metrics)),
tx_cache,
txid_limit,
duration: metrics.histogram_vec(
HistogramOpts::new("electrs_query_duration", "Request duration (in seconds)"),
&["type"],
),
})
}
fn load_txns_by_prefix(
&self,
store: &dyn ReadStore,
prefixes: Vec<HashPrefix>,
) -> Result<Vec<TxnHeight>> {
let mut txns = vec![];
for txid_prefix in prefixes {
for tx_row in txrows_by_prefix(store, txid_prefix) {
let txid: Txid = deserialize(&tx_row.key.txid).unwrap();
let txn = self.load_txn(&txid, Some(tx_row.height))?;
txns.push(TxnHeight {
txn,
height: tx_row.height,
})
}
}
Ok(txns)
}
fn find_spending_input(
&self,
store: &dyn ReadStore,
funding: &FundingOutput,
) -> Result<Option<SpendingInput>> {
let spending_txns: Vec<TxnHeight> = self.load_txns_by_prefix(
store,
txids_by_funding_output(store, &funding.txn_id, funding.output_index),
)?;
let mut spending_inputs = vec![];
for t in &spending_txns {
for input in t.txn.input.iter() {
if input.previous_output.txid == funding.txn_id
&& input.previous_output.vout == funding.output_index as u32
{
spending_inputs.push(SpendingInput {
txn_id: t.txn.txid(),
height: t.height,
funding_output: (funding.txn_id, funding.output_index),
value: funding.value,
})
}
}
}
assert!(spending_inputs.len() <= 1);
Ok(if spending_inputs.len() == 1 {
Some(spending_inputs.remove(0))
} else {
None
})
}
fn find_funding_outputs(&self, t: &TxnHeight, script_hash: &[u8]) -> Vec<FundingOutput> {
let mut result = vec![];
let txn_id = t.txn.txid();
for (index, output) in t.txn.output.iter().enumerate() {
if compute_script_hash(&output.script_pubkey[..]) == script_hash {
result.push(FundingOutput {
txn_id,
height: t.height,
output_index: index,
value: output.value,
})
}
}
result
}
fn confirmed_status(
&self,
script_hash: &[u8],
) -> Result<(Vec<FundingOutput>, Vec<SpendingInput>)> {
let mut funding = vec![];
let mut spending = vec![];
let read_store = self.app.read_store();
let txid_prefixes = txids_by_script_hash(read_store, script_hash);
// if the limit is enabled
if self.txid_limit > 0 && txid_prefixes.len() > self.txid_limit {
bail!(
"{}+ transactions found, query may take a long time",
txid_prefixes.len()
);
}
for t in self.load_txns_by_prefix(read_store, txid_prefixes)? {
funding.extend(self.find_funding_outputs(&t, script_hash));
}
for funding_output in &funding {
if let Some(spent) = self.find_spending_input(read_store, &funding_output)? {
spending.push(spent);
}
}
Ok((funding, spending))
}
fn mempool_status(
&self,
script_hash: &[u8],
confirmed_funding: &[FundingOutput],
tracker: &Tracker,
) -> Result<(Vec<FundingOutput>, Vec<SpendingInput>)> {
let mut funding = vec![];
let mut spending = vec![];
let txid_prefixes = txids_by_script_hash(tracker.index(), script_hash);
for t in self.load_txns_by_prefix(tracker.index(), txid_prefixes)? {
funding.extend(self.find_funding_outputs(&t, script_hash));
}
// // TODO: dedup outputs (somehow) both confirmed and in mempool (e.g. reorg?)
for funding_output in funding.iter().chain(confirmed_funding.iter()) {
if let Some(spent) = self.find_spending_input(tracker.index(), &funding_output)? {
spending.push(spent);
}
}
Ok((funding, spending))
}
pub fn status(&self, script_hash: &[u8]) -> Result<Status> {
let timer = self
.duration
.with_label_values(&["confirmed_status"])
.start_timer();
let confirmed = self
.confirmed_status(script_hash)
.chain_err(|| "failed to get confirmed status")?;
timer.observe_duration();
let tracker = self.tracker.read().unwrap();
let timer = self
.duration
.with_label_values(&["mempool_status"])
.start_timer();
let mempool = self
.mempool_status(script_hash, &confirmed.0, &tracker)
.chain_err(|| "failed to get mempool status")?;
timer.observe_duration();
let mut txn_fees = HashMap::new();
let funding_txn_ids = mempool.0.iter().map(|funding| funding.txn_id);
let spending_txn_ids = mempool.1.iter().map(|spending| spending.txn_id);
for mempool_txid in funding_txn_ids.chain(spending_txn_ids) {
tracker
.get_fee(&mempool_txid)
.map(|fee| txn_fees.insert(mempool_txid, fee));
}
Ok(Status {
confirmed,
mempool,
txn_fees,
})
}
fn lookup_confirmed_blockhash(
&self,
tx_hash: &Txid,
block_height: Option<u32>,
) -> Result<Option<BlockHash>> {
let blockhash = if self.tracker.read().unwrap().has_txn(&tx_hash) {
None // found in mempool (as unconfirmed transaction)
} else {
// Lookup in confirmed transactions' index
let height = match block_height {
Some(height) => height,
None => {
txrow_by_txid(self.app.read_store(), &tx_hash)
.chain_err(|| format!("not indexed tx {}", tx_hash))?
.height
}
};
let header = self
.app
.index()
.get_header(height as usize)
.chain_err(|| format!("missing header at height {}", height))?;
Some(*header.hash())
};
Ok(blockhash)
}
// Internal API for transaction retrieval
fn load_txn(&self, txid: &Txid, block_height: Option<u32>) -> Result<Transaction> {
let _timer = self.duration.with_label_values(&["load_txn"]).start_timer();
self.tx_cache.get_or_else(&txid, || {
let blockhash = self.lookup_confirmed_blockhash(txid, block_height)?;
let value: Value = self
.app
.daemon()
.gettransaction_raw(txid, blockhash, /*verbose*/ false)?;
let value_hex: &str = value.as_str().chain_err(|| "non-string tx")?;
hex::decode(&value_hex).chain_err(|| "non-hex tx")
})
}
// Public API for transaction retrieval (for Electrum RPC)
pub fn get_transaction(&self, tx_hash: &Txid, verbose: bool) -> Result<Value> {
let _timer = self
.duration
.with_label_values(&["get_transaction"])
.start_timer();
let blockhash = self.lookup_confirmed_blockhash(tx_hash, /*block_height*/ None)?;
self.app
.daemon()
.gettransaction_raw(tx_hash, blockhash, verbose)
}
pub fn get_confirmed_blockhash(&self, tx_hash: &Txid) -> Result<Value> {
let blockhash = self.lookup_confirmed_blockhash(tx_hash, None)?;
Ok(json!({ "block_hash": blockhash }))
}
pub fn get_headers(&self, heights: &[usize]) -> Vec<HeaderEntry> {
let _timer = self
.duration
.with_label_values(&["get_headers"])
.start_timer();
let index = self.app.index();
heights
.iter()
.filter_map(|height| index.get_header(*height))
.collect()
}
pub fn get_best_header(&self) -> Result<HeaderEntry> {
let last_header = self.app.index().best_header();
Ok(last_header.chain_err(|| "no headers indexed")?)
}
pub fn get_merkle_proof(
&self,
tx_hash: &Txid,
height: usize,
) -> Result<(Vec<TxMerkleNode>, usize)> {
let header_entry = self
.app
.index()
.get_header(height)
.chain_err(|| format!("missing block #{}", height))?;
let txids = self.app.daemon().getblocktxids(&header_entry.hash())?;
let pos = txids
.iter()
.position(|txid| txid == tx_hash)
.chain_err(|| format!("missing txid {}", tx_hash))?;
let tx_nodes: Vec<TxMerkleNode> = txids
.into_iter()
.map(|txid| TxMerkleNode::from_inner(txid.into_inner()))
.collect();
let (branch, _root) = create_merkle_branch_and_root(tx_nodes, pos);
Ok((branch, pos))
}
pub fn get_header_merkle_proof(
&self,
height: usize,
cp_height: usize,
) -> Result<(Vec<Sha256dHash>, Sha256dHash)> {
if cp_height < height {
bail!("cp_height #{} < height #{}", cp_height, height);
}
let best_height = self.get_best_header()?.height();
if best_height < cp_height {
bail!(
"cp_height #{} above best block height #{}",
cp_height,
best_height
);
}
let heights: Vec<usize> = (0..=cp_height).collect();
let header_hashes: Vec<BlockHash> = self
.get_headers(&heights)
.into_iter()
.map(|h| *h.hash())
.collect();
let merkle_nodes: Vec<Sha256dHash> = header_hashes
.iter()
.map(|block_hash| Sha256dHash::from_inner(block_hash.into_inner()))
.collect();
assert_eq!(header_hashes.len(), heights.len());
Ok(create_merkle_branch_and_root(merkle_nodes, height))
}
pub fn get_id_from_pos(
&self,
height: usize,
tx_pos: usize,
want_merkle: bool,
) -> Result<(Txid, Vec<TxMerkleNode>)> {
let header_entry = self
.app
.index()
.get_header(height)
.chain_err(|| format!("missing block #{}", height))?;
let txids = self.app.daemon().getblocktxids(header_entry.hash())?;
let txid = *txids
.get(tx_pos)
.chain_err(|| format!("No tx in position #{} in block #{}", tx_pos, height))?;
let tx_nodes = txids
.into_iter()
.map(|txid| TxMerkleNode::from_inner(txid.into_inner()))
.collect();
let branch = if want_merkle {
create_merkle_branch_and_root(tx_nodes, tx_pos).0
} else {
vec![]
};
Ok((txid, branch))
}
pub fn broadcast(&self, txn: &Transaction) -> Result<Txid> {
self.app.daemon().broadcast(txn)
}
pub fn update_mempool(&self) -> Result<()> {
let _timer = self
.duration
.with_label_values(&["update_mempool"])
.start_timer();
self.tracker.write().unwrap().update(self.app.daemon())
}
/// Returns [vsize, fee_rate] pairs (measured in vbytes and satoshis).
pub fn get_fee_histogram(&self) -> Vec<(f32, u32)> {
self.tracker.read().unwrap().fee_histogram().clone()
}
// Fee rate [BTC/kB] to be confirmed in `blocks` from now.
pub fn estimate_fee(&self, blocks: usize) -> f64 {
let mut total_vsize = 0u32;
let mut last_fee_rate = 0.0;
let blocks_in_vbytes = (blocks * 1_000_000) as u32; // assume ~1MB blocks
for (fee_rate, vsize) in self.tracker.read().unwrap().fee_histogram() {
last_fee_rate = *fee_rate;
total_vsize += vsize;
if total_vsize >= blocks_in_vbytes {
break; // under-estimate the fee rate a bit
}
}
(last_fee_rate as f64) * 1e-5 // [BTC/kB] = 10^5 [sat/B]
}
pub fn get_banner(&self) -> Result<String> {
self.app.get_banner()
}
pub fn get_relayfee(&self) -> Result<f64> {
self.app.daemon().get_relayfee()
}
}