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/// API handlers, the ends of each filter chain
use log::debug; // this is more useful than debug! learn how to use this
use parking_lot::RwLockUpgradableReadGuard;
use std::convert::Infallible;
use warp::{http::StatusCode, reply};
use crate::schema::{Block, Db, Transaction};
/// GET /transaction
/// Returns JSON array of transactions
/// Cannot fail
pub async fn list_transactions(db: Db) -> Result<impl warp::Reply, Infallible> {
debug!("list all transactions");
let mut result = Vec::new();
let transactions = db.pending_transactions.read();
// let transactions = transactions.clone().into_iter().collect();
for (_, value) in transactions.iter() {
result.push(value)
}
Ok(reply::with_status(reply::json(&result), StatusCode::OK))
}
/// GET /block
/// Returns JSON array of blocks
/// Cannot fail
/// Mostly around for debug purposes
pub async fn list_blocks(db: Db) -> Result<impl warp::Reply, Infallible> {
debug!("list all blocks");
let mut result = Vec::new();
let blocks = db.blockchain.read();
for block in blocks.iter() {
result.push(block);
}
Ok(reply::with_status(reply::json(&result), StatusCode::OK))
}
/// POST /transaction
/// Pushes a new transaction for pending transaction pool
/// Can reject the transaction proposal
/// TODO: when is a new transaction rejected <07-04-21, yigit> //
pub async fn propose_transaction(
new_transaction: Transaction,
db: Db,
) -> Result<impl warp::Reply, warp::Rejection> {
debug!("new transaction request {:?}", new_transaction);
// let mut transactions = db.lock().await;
let mut transactions = db.pending_transactions.write();
transactions.insert(new_transaction.source.to_owned(), new_transaction);
Ok(StatusCode::CREATED)
}
/// POST /block
/// Proposes a new block for the next round
/// Can reject the block
pub async fn propose_block(new_block: Block, db: Db) -> Result<impl warp::Reply, warp::Rejection> {
debug!("new block request {:?}", new_block);
// https://blog.logrocket.com/create-an-async-crud-web-service-in-rust-with-warp/ (this has
// error.rs, error struct, looks very clean)
let pending_transactions = db.pending_transactions.upgradable_read();
let blockchain = db.blockchain.upgradable_read();
// TODO: check 1, new_block.transaction_list from pending_transactions pool? <07-04-21, yigit> //
for transaction_hash in new_block.transaction_list.iter() {
if !pending_transactions.contains_key(transaction_hash) {
return Ok(StatusCode::BAD_REQUEST);
}
}
// TODO: check 2, block hash (\w nonce) asserts $hash_condition? <07-04-21, yigit> //
// assume it is for now
let mut blockchain = RwLockUpgradableReadGuard::upgrade(blockchain);
blockchain.push(new_block);
let mut pending_transactions = RwLockUpgradableReadGuard::upgrade(pending_transactions);
pending_transactions.clear();
Ok(StatusCode::CREATED)
}
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