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#![allow(bare_trait_objects)]
use exonum::{
blockchain::{ExecutionError, ExecutionResult, Transaction, TransactionContext},
crypto::{PublicKey, SecretKey},
messages::{Message, RawTransaction, Signed},
};
use super::proto;
use crate::{schema::Schema, CRYPTOCURRENCY_SERVICE_ID};
const ERROR_SENDER_SAME_AS_RECEIVER: u8 = 0;
#[derive(Debug, Fail)]
#[repr(u8)]
pub enum Error {
#[fail(display = "Wallet already exists")]
WalletAlreadyExists = 0,
#[fail(display = "Sender doesn't exist")]
SenderNotFound = 1,
#[fail(display = "Receiver doesn't exist")]
ReceiverNotFound = 2,
#[fail(display = "Insufficient currency amount")]
InsufficientCurrencyAmount = 3,
}
impl From<Error> for ExecutionError {
fn from(value: Error) -> ExecutionError {
let description = format!("{}", value);
ExecutionError::with_description(value as u8, description)
}
}
#[derive(Clone, Debug, ProtobufConvert)]
#[exonum(pb = "proto::Transfer", serde_pb_convert)]
pub struct Transfer {
pub to: PublicKey,
pub amount: u64,
pub seed: u64,
}
#[derive(Serialize, Deserialize, Clone, Debug, ProtobufConvert)]
#[exonum(pb = "proto::Issue")]
pub struct Issue {
pub amount: u64,
pub seed: u64,
}
#[derive(Serialize, Deserialize, Clone, Debug, ProtobufConvert)]
#[exonum(pb = "proto::CreateWallet")]
pub struct CreateWallet {
pub name: String,
}
#[derive(Serialize, Deserialize, Clone, Debug, TransactionSet)]
pub enum WalletTransactions {
Transfer(Transfer),
Issue(Issue),
CreateWallet(CreateWallet),
}
impl CreateWallet {
#[doc(hidden)]
pub fn sign(name: &str, pk: &PublicKey, sk: &SecretKey) -> Signed<RawTransaction> {
Message::sign_transaction(
Self {
name: name.to_owned(),
},
CRYPTOCURRENCY_SERVICE_ID,
*pk,
sk,
)
}
}
impl Transfer {
#[doc(hidden)]
pub fn sign(
pk: &PublicKey,
&to: &PublicKey,
amount: u64,
seed: u64,
sk: &SecretKey,
) -> Signed<RawTransaction> {
Message::sign_transaction(
Self { to, amount, seed },
CRYPTOCURRENCY_SERVICE_ID,
*pk,
sk,
)
}
}
impl Transaction for Transfer {
fn execute(&self, mut context: TransactionContext) -> ExecutionResult {
let from = &context.author();
let hash = context.tx_hash();
let mut schema = Schema::new(context.fork());
let to = &self.to;
let amount = self.amount;
if from == to {
return Err(ExecutionError::new(ERROR_SENDER_SAME_AS_RECEIVER));
}
let sender = schema.wallet(from).ok_or(Error::SenderNotFound)?;
let receiver = schema.wallet(to).ok_or(Error::ReceiverNotFound)?;
if sender.balance < amount {
Err(Error::InsufficientCurrencyAmount)?
}
schema.decrease_wallet_balance(sender, amount, &hash);
schema.increase_wallet_balance(receiver, amount, &hash);
Ok(())
}
}
impl Transaction for Issue {
fn execute(&self, mut context: TransactionContext) -> ExecutionResult {
let pub_key = &context.author();
let hash = context.tx_hash();
let mut schema = Schema::new(context.fork());
if let Some(wallet) = schema.wallet(pub_key) {
let amount = self.amount;
schema.increase_wallet_balance(wallet, amount, &hash);
Ok(())
} else {
Err(Error::ReceiverNotFound)?
}
}
}
impl Transaction for CreateWallet {
fn execute(&self, mut context: TransactionContext) -> ExecutionResult {
let pub_key = &context.author();
let hash = context.tx_hash();
let mut schema = Schema::new(context.fork());
if schema.wallet(pub_key).is_none() {
let name = &self.name;
schema.create_wallet(pub_key, name, &hash);
Ok(())
} else {
Err(Error::WalletAlreadyExists)?
}
}
}