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solana-with-rpc-optimizations
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Introducing Scripts 

A sequence of instructions. A client compiles the script and then uses
the compiled script to construction a transaction. Then it adds a
adds a blockhash, signs the transaction, and sends it off for
processing.
This commit is contained in:
Greg Fitzgerald 2019-03-16 14:30:10 -06:00 committed by Grimes
parent 55cdbedb52
commit ae4d14a2ad
6 changed files with 268 additions and 178 deletions
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225
programs/budget/src/budget_program.rs
View File

@ -143,9 +143,10 @@ pub fn process_instruction(
#[cfg(test)]
mod test {
use super::*;
use solana_budget_api::budget_transaction::BudgetTransaction;
use solana_budget_api::budget_instruction::BudgetInstruction;
use solana_budget_api::id;
use solana_runtime::bank::Bank;
use solana_runtime::bank_client::BankClient;
use solana_sdk::genesis_block::GenesisBlock;
use solana_sdk::signature::{Keypair, KeypairUtil};
use solana_sdk::transaction::{InstructionError, Transaction, TransactionError};
@ -157,41 +158,41 @@ mod test {
(bank, mint_keypair)
}
#[test]
fn test_invalid_instruction() {
let (bank, from) = create_bank(10_000);
let blockhash = bank.last_blockhash();
let contract = Keypair::new();
let data = (1u8, 2u8, 3u8);
let tx = Transaction::new_signed(&from, &[contract.pubkey()], &id(), &data, blockhash, 0);
assert!(bank.process_transaction(&tx).is_err());
}
#[test]
fn test_unsigned_witness_key() {
let (bank, from) = create_bank(10_000);
let blockhash = bank.last_blockhash();
let (bank, mint_keypair) = create_bank(10_000);
let alice_client = BankClient::new(&bank, mint_keypair);
let alice_pubkey = alice_client.pubkey();
// Initialize BudgetState
let contract = Keypair::new().pubkey();
let to = Keypair::new().pubkey();
let budget_pubkey = Keypair::new().pubkey();
let bob_pubkey = Keypair::new().pubkey();
let witness = Keypair::new().pubkey();
let tx =
BudgetTransaction::new_when_signed(&from, &to, &contract, &witness, None, 1, blockhash);
bank.process_transaction(&tx).unwrap();
let script = BudgetInstruction::new_when_signed_script(
&alice_pubkey,
&bob_pubkey,
&budget_pubkey,
&witness,
None,
1,
);
alice_client.process_script(script).unwrap();
// Attack! Part 1: Sign a witness transaction with a random key.
let rando = Keypair::new();
bank.transfer(1, &from, &rando.pubkey(), blockhash).unwrap();
let mut tx = BudgetTransaction::new_signature(&rando, &contract, &to, blockhash);
let mallory_client = BankClient::new(&bank, Keypair::new());
let mallory_pubkey = mallory_client.pubkey();
alice_client.transfer(1, &mallory_pubkey).unwrap();
let instruction =
BudgetInstruction::new_apply_signature(&mallory_pubkey, &budget_pubkey, &bob_pubkey);
let mut transaction = Transaction::new(vec![instruction]);
// Attack! Part 2: Point the instruction to the expected, but unsigned, key.
tx.account_keys.push(from.pubkey());
tx.instructions[0].accounts[0] = 3;
transaction.account_keys.push(alice_pubkey);
transaction.instructions[0].accounts[0] = 3;
// Ensure the transaction fails because of the unsigned key.
assert_eq!(
bank.process_transaction(&tx),
mallory_client.process_transaction(transaction),
Err(TransactionError::InstructionError(
0,
InstructionError::ProgramError(ProgramError::MissingRequiredSignature)
@ -201,37 +202,44 @@ mod test {
#[test]
fn test_unsigned_timestamp() {
let (bank, from) = create_bank(10_000);
let blockhash = bank.last_blockhash();
let (bank, mint_keypair) = create_bank(10_000);
let alice_client = BankClient::new(&bank, mint_keypair);
let alice_pubkey = alice_client.pubkey();
// Initialize BudgetState
let contract = Keypair::new().pubkey();
let to = Keypair::new().pubkey();
let budget_pubkey = Keypair::new().pubkey();
let bob_pubkey = Keypair::new().pubkey();
let dt = Utc::now();
let tx = BudgetTransaction::new_on_date(
&from,
&to,
&contract,
let script = BudgetInstruction::new_on_date_script(
&alice_pubkey,
&bob_pubkey,
&budget_pubkey,
dt,
&from.pubkey(),
&alice_pubkey,
None,
1,
blockhash,
);
bank.process_transaction(&tx).unwrap();
alice_client.process_script(script).unwrap();
// Attack! Part 1: Sign a timestamp transaction with a random key.
let rando = Keypair::new();
bank.transfer(1, &from, &rando.pubkey(), blockhash).unwrap();
let mut tx = BudgetTransaction::new_timestamp(&rando, &contract, &to, dt, blockhash);
let mallory_client = BankClient::new(&bank, Keypair::new());
let mallory_pubkey = mallory_client.pubkey();
alice_client.transfer(1, &mallory_pubkey).unwrap();
let instruction = BudgetInstruction::new_apply_timestamp(
&mallory_pubkey,
&budget_pubkey,
&bob_pubkey,
dt,
);
let mut transaction = Transaction::new(vec![instruction]);
// Attack! Part 2: Point the instruction to the expected, but unsigned, key.
tx.account_keys.push(from.pubkey());
tx.instructions[0].accounts[0] = 3;
transaction.account_keys.push(alice_pubkey);
transaction.instructions[0].accounts[0] = 3;
// Ensure the transaction fails because of the unsigned key.
assert_eq!(
bank.process_transaction(&tx),
mallory_client.process_transaction(transaction),
Err(TransactionError::InstructionError(
0,
InstructionError::ProgramError(ProgramError::MissingRequiredSignature)
@ -241,40 +249,39 @@ mod test {
#[test]
fn test_transfer_on_date() {
let (bank, from) = create_bank(2);
let blockhash = bank.last_blockhash();
let contract = Keypair::new();
let to = Keypair::new();
let rando = Keypair::new();
let (bank, mint_keypair) = create_bank(2);
let alice_client = BankClient::new(&bank, mint_keypair);
let alice_pubkey = alice_client.pubkey();
let budget_pubkey = Keypair::new().pubkey();
let bob_pubkey = Keypair::new().pubkey();
let mallory_pubkey = Keypair::new().pubkey();
let dt = Utc::now();
let tx = BudgetTransaction::new_on_date(
&from,
&to.pubkey(),
&contract.pubkey(),
let script = BudgetInstruction::new_on_date_script(
&alice_pubkey,
&bob_pubkey,
&budget_pubkey,
dt,
&from.pubkey(),
&alice_pubkey,
None,
1,
blockhash,
);
bank.process_transaction(&tx).unwrap();
assert_eq!(bank.get_balance(&from.pubkey()), 1);
assert_eq!(bank.get_balance(&contract.pubkey()), 1);
alice_client.process_script(script).unwrap();
assert_eq!(bank.get_balance(&alice_pubkey), 1);
assert_eq!(bank.get_balance(&budget_pubkey), 1);
let contract_account = bank.get_account(&contract.pubkey()).unwrap();
let contract_account = bank.get_account(&budget_pubkey).unwrap();
let budget_state = BudgetState::deserialize(&contract_account.data).unwrap();
assert!(budget_state.is_pending());
// Attack! Try to payout to a rando key
let tx = BudgetTransaction::new_timestamp(
&from,
&contract.pubkey(),
&rando.pubkey(),
// Attack! Try to payout to mallory_pubkey
let instruction = BudgetInstruction::new_apply_timestamp(
&alice_pubkey,
&budget_pubkey,
&mallory_pubkey,
dt,
blockhash,
);
assert_eq!(
bank.process_transaction(&tx).unwrap_err(),
alice_client.process_script(vec![instruction]).unwrap_err(),
TransactionError::InstructionError(
0,
InstructionError::ProgramError(ProgramError::CustomError(
@ -282,77 +289,71 @@ mod test {
))
)
);
assert_eq!(bank.get_balance(&from.pubkey()), 1);
assert_eq!(bank.get_balance(&contract.pubkey()), 1);
assert_eq!(bank.get_balance(&to.pubkey()), 0);
assert_eq!(bank.get_balance(&alice_pubkey), 1);
assert_eq!(bank.get_balance(&budget_pubkey), 1);
assert_eq!(bank.get_balance(&bob_pubkey), 0);
let contract_account = bank.get_account(&contract.pubkey()).unwrap();
let contract_account = bank.get_account(&budget_pubkey).unwrap();
let budget_state = BudgetState::deserialize(&contract_account.data).unwrap();
assert!(budget_state.is_pending());
// Now, acknowledge the time in the condition occurred and
// that pubkey's funds are now available.
let tx = BudgetTransaction::new_timestamp(
&from,
&contract.pubkey(),
&to.pubkey(),
dt,
blockhash,
);
bank.process_transaction(&tx).unwrap();
assert_eq!(bank.get_balance(&from.pubkey()), 1);
assert_eq!(bank.get_balance(&contract.pubkey()), 0);
assert_eq!(bank.get_balance(&to.pubkey()), 1);
assert_eq!(bank.get_account(&contract.pubkey()), None);
let instruction =
BudgetInstruction::new_apply_timestamp(&alice_pubkey, &budget_pubkey, &bob_pubkey, dt);
alice_client.process_script(vec![instruction]).unwrap();
assert_eq!(bank.get_balance(&alice_pubkey), 1);
assert_eq!(bank.get_balance(&budget_pubkey), 0);
assert_eq!(bank.get_balance(&bob_pubkey), 1);
assert_eq!(bank.get_account(&budget_pubkey), None);
}
#[test]
fn test_cancel_transfer() {
let (bank, from) = create_bank(3);
let blockhash = bank.last_blockhash();
let contract = Keypair::new();
let to = Keypair::new();
let (bank, mint_keypair) = create_bank(3);
let alice_client = BankClient::new(&bank, mint_keypair);
let alice_pubkey = alice_client.pubkey();
let budget_pubkey = Keypair::new().pubkey();
let bob_pubkey = Keypair::new().pubkey();
let dt = Utc::now();
let tx = BudgetTransaction::new_on_date(
&from,
&to.pubkey(),
&contract.pubkey(),
let script = BudgetInstruction::new_on_date_script(
&alice_pubkey,
&bob_pubkey,
&budget_pubkey,
dt,
&from.pubkey(),
Some(from.pubkey()),
&alice_pubkey,
Some(alice_pubkey),
1,
blockhash,
);
bank.process_transaction(&tx).unwrap();
assert_eq!(bank.get_balance(&from.pubkey()), 2);
assert_eq!(bank.get_balance(&contract.pubkey()), 1);
alice_client.process_script(script).unwrap();
assert_eq!(bank.get_balance(&alice_pubkey), 2);
assert_eq!(bank.get_balance(&budget_pubkey), 1);
let contract_account = bank.get_account(&contract.pubkey()).unwrap();
let contract_account = bank.get_account(&budget_pubkey).unwrap();
let budget_state = BudgetState::deserialize(&contract_account.data).unwrap();
assert!(budget_state.is_pending());
// Attack! try to put the lamports into the wrong account with cancel
let rando = Keypair::new();
bank.transfer(1, &from, &rando.pubkey(), blockhash).unwrap();
assert_eq!(bank.get_balance(&from.pubkey()), 1);
let mallory_client = BankClient::new(&bank, Keypair::new());
let mallory_pubkey = mallory_client.pubkey();
alice_client.transfer(1, &mallory_pubkey).unwrap();
assert_eq!(bank.get_balance(&alice_pubkey), 1);
let tx =
BudgetTransaction::new_signature(&rando, &contract.pubkey(), &to.pubkey(), blockhash);
// unit test hack, the `from account` is passed instead of the `to` account to avoid
// creating more account vectors
bank.process_transaction(&tx).unwrap();
let instruction =
BudgetInstruction::new_apply_signature(&mallory_pubkey, &budget_pubkey, &bob_pubkey);
mallory_client.process_script(vec![instruction]).unwrap();
// nothing should be changed because apply witness didn't finalize a payment
assert_eq!(bank.get_balance(&from.pubkey()), 1);
assert_eq!(bank.get_balance(&contract.pubkey()), 1);
assert_eq!(bank.get_account(&to.pubkey()), None);
assert_eq!(bank.get_balance(&alice_pubkey), 1);
assert_eq!(bank.get_balance(&budget_pubkey), 1);
assert_eq!(bank.get_account(&bob_pubkey), None);
// Now, cancel the transaction. from gets her funds back
let tx =
BudgetTransaction::new_signature(&from, &contract.pubkey(), &from.pubkey(), blockhash);
bank.process_transaction(&tx).unwrap();
assert_eq!(bank.get_balance(&from.pubkey()), 2);
assert_eq!(bank.get_account(&contract.pubkey()), None);
assert_eq!(bank.get_account(&to.pubkey()), None);
// Now, cancel the transaction. mint gets her funds back
let instruction =
BudgetInstruction::new_apply_signature(&alice_pubkey, &budget_pubkey, &alice_pubkey);
alice_client.process_script(vec![instruction]).unwrap();
assert_eq!(bank.get_balance(&alice_pubkey), 2);
assert_eq!(bank.get_account(&budget_pubkey), None);
assert_eq!(bank.get_account(&bob_pubkey), None);
}
}

81
programs/budget_api/src/budget_instruction.rs
View File

@ -1,9 +1,12 @@
use crate::budget_expr::BudgetExpr;
use crate::budget_expr::{BudgetExpr, Condition};
use crate::budget_state::BudgetState;
use crate::id;
use bincode::serialized_size;
use chrono::prelude::{DateTime, Utc};
use serde_derive::{Deserialize, Serialize};
use solana_sdk::pubkey::Pubkey;
use solana_sdk::transaction::Instruction;
use solana_sdk::system_instruction::SystemInstruction;
use solana_sdk::transaction::{Instruction, Script};
/// A smart contract.
#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
@ -37,6 +40,80 @@ impl BudgetInstruction {
Instruction::new(id(), &BudgetInstruction::InitializeAccount(expr), keys)
}
pub fn new_initialize_account_script(
from: &Pubkey,
contract: &Pubkey,
lamports: u64,
expr: BudgetExpr,
) -> Script {
let space = serialized_size(&BudgetState::new(expr.clone())).unwrap();
vec![
SystemInstruction::new_program_account(&from, contract, lamports, space, &id()),
Self::new_initialize_account(contract, expr),
]
}
/// Create a postdated payment script.
pub fn new_on_date_script(
from: &Pubkey,
to: &Pubkey,
contract: &Pubkey,
dt: DateTime<Utc>,
dt_pubkey: &Pubkey,
cancelable: Option<Pubkey>,
lamports: u64,
) -> Script {
let expr = if let Some(from) = cancelable {
BudgetExpr::Or(
(
Condition::Timestamp(dt, *dt_pubkey),
Box::new(BudgetExpr::new_payment(lamports, to)),
),
(
Condition::Signature(from),
Box::new(BudgetExpr::new_payment(lamports, &from)),
),
)
} else {
BudgetExpr::After(
Condition::Timestamp(dt, *dt_pubkey),
Box::new(BudgetExpr::new_payment(lamports, to)),
)
};
Self::new_initialize_account_script(from, contract, lamports, expr)
}
/// Create a multisig payment script.
pub fn new_when_signed_script(
from: &Pubkey,
to: &Pubkey,
contract: &Pubkey,
witness: &Pubkey,
cancelable: Option<Pubkey>,
lamports: u64,
) -> Script {
let expr = if let Some(from) = cancelable {
BudgetExpr::Or(
(
Condition::Signature(*witness),
Box::new(BudgetExpr::new_payment(lamports, to)),
),
(
Condition::Signature(from),
Box::new(BudgetExpr::new_payment(lamports, &from)),
),
)
} else {
BudgetExpr::After(
Condition::Signature(*witness),
Box::new(BudgetExpr::new_payment(lamports, to)),
)
};
Self::new_initialize_account_script(from, contract, lamports, expr)
}
pub fn new_apply_timestamp(
from: &Pubkey,
contract: &Pubkey,

71
programs/budget_api/src/budget_transaction.rs
View File

@ -1,6 +1,6 @@
//! The `budget_transaction` module provides functionality for creating Budget transactions.
use crate::budget_expr::{BudgetExpr, Condition};
use crate::budget_expr::BudgetExpr;
use crate::budget_instruction::BudgetInstruction;
use crate::budget_state::BudgetState;
use crate::id;
@ -10,7 +10,7 @@ use solana_sdk::hash::Hash;
use solana_sdk::pubkey::Pubkey;
use solana_sdk::signature::{Keypair, KeypairUtil};
use solana_sdk::system_instruction::SystemInstruction;
use solana_sdk::transaction::Transaction;
use solana_sdk::transaction::{Script, Transaction};
pub struct BudgetTransaction {}
@ -36,6 +36,18 @@ impl BudgetTransaction {
tx
}
fn new_signed(
from_keypair: &Keypair,
script: Script,
recent_blockhash: Hash,
fee: u64,
) -> Transaction {
let mut tx = Transaction::new(script);
tx.fee = fee;
tx.sign(&[from_keypair], recent_blockhash);
tx
}
/// Create and sign a new Transaction. Used for unit-testing.
pub fn new_payment(
from_keypair: &Keypair,
@ -96,24 +108,16 @@ impl BudgetTransaction {
lamports: u64,
recent_blockhash: Hash,
) -> Transaction {
let expr = if let Some(from) = cancelable {
BudgetExpr::Or(
(
Condition::Timestamp(dt, *dt_pubkey),
Box::new(BudgetExpr::new_payment(lamports, to)),
),
(
Condition::Signature(from),
Box::new(BudgetExpr::new_payment(lamports, &from)),
),
)
} else {
BudgetExpr::After(
Condition::Timestamp(dt, *dt_pubkey),
Box::new(BudgetExpr::new_payment(lamports, to)),
)
};
Self::new(from_keypair, contract, expr, lamports, recent_blockhash, 0)
let script = BudgetInstruction::new_on_date_script(
&from_keypair.pubkey(),
to,
contract,
dt,
dt_pubkey,
cancelable,
lamports,
);
Self::new_signed(from_keypair, script, recent_blockhash, 0)
}
/// Create and sign a multisig Transaction.
@ -126,24 +130,15 @@ impl BudgetTransaction {
lamports: u64,
recent_blockhash: Hash,
) -> Transaction {
let expr = if let Some(from) = cancelable {
BudgetExpr::Or(
(
Condition::Signature(*witness),
Box::new(BudgetExpr::new_payment(lamports, to)),
),
(
Condition::Signature(from),
Box::new(BudgetExpr::new_payment(lamports, &from)),
),
)
} else {
BudgetExpr::After(
Condition::Signature(*witness),
Box::new(BudgetExpr::new_payment(lamports, to)),
)
};
Self::new(from_keypair, contract, expr, lamports, recent_blockhash, 0)
let script = BudgetInstruction::new_when_signed_script(
&from_keypair.pubkey(),
to,
contract,
witness,
cancelable,
lamports,
);
Self::new_signed(from_keypair, script, recent_blockhash, 0)
}
pub fn system_instruction(tx: &Transaction, index: usize) -> Option<SystemInstruction> {

25
runtime/src/bank_client.rs
View File

@ -1,6 +1,8 @@
use crate::bank::Bank;
use solana_sdk::signature::Keypair;
use solana_sdk::transaction::{Transaction, TransactionError};
use solana_sdk::pubkey::Pubkey;
use solana_sdk::signature::{Keypair, KeypairUtil};
use solana_sdk::system_instruction::SystemInstruction;
use solana_sdk::transaction::{Script, Transaction, TransactionError};
pub struct BankClient<'a> {
bank: &'a Bank,
@ -12,8 +14,23 @@ impl<'a> BankClient<'a> {
Self { bank, keypair }
}
pub fn process_transaction(&self, tx: &mut Transaction) -> Result<(), TransactionError> {
pub fn pubkey(&self) -> Pubkey {
self.keypair.pubkey()
}
pub fn process_transaction(&self, mut tx: Transaction) -> Result<(), TransactionError> {
tx.sign(&[&self.keypair], self.bank.last_blockhash());
self.bank.process_transaction(tx)
self.bank.process_transaction(&mut tx)
}
/// Create and process a transaction.
pub fn process_script(&self, script: Script) -> Result<(), TransactionError> {
self.process_transaction(Transaction::new(script))
}
/// Transfer lamports to pubkey
pub fn transfer(&self, lamports: u64, pubkey: &Pubkey) -> Result<(), TransactionError> {
let move_instruction = SystemInstruction::new_move(&self.pubkey(), pubkey, lamports);
self.process_script(vec![move_instruction])
}
}

31
runtime/tests/system.rs
View File

@ -5,39 +5,36 @@ use solana_sdk::native_program::ProgramError;
use solana_sdk::signature::{Keypair, KeypairUtil};
use solana_sdk::system_instruction::SystemInstruction;
use solana_sdk::system_program;
use solana_sdk::transaction::{Instruction, InstructionError, Transaction, TransactionError};
use solana_sdk::transaction::{Instruction, InstructionError, TransactionError};
#[test]
fn test_system_unsigned_transaction() {
let (genesis_block, from_keypair) = GenesisBlock::new(100);
let (genesis_block, mint_keypair) = GenesisBlock::new(100);
let bank = Bank::new(&genesis_block);
let from_pubkey = from_keypair.pubkey();
let alice_client = BankClient::new(&bank, from_keypair);
let to_keypair = Keypair::new();
let to_pubkey = to_keypair.pubkey();
let mallory_client = BankClient::new(&bank, to_keypair);
let alice_client = BankClient::new(&bank, mint_keypair);
let alice_pubkey = alice_client.pubkey();
let mallory_client = BankClient::new(&bank, Keypair::new());
let mallory_pubkey = mallory_client.pubkey();
// Fund to account to bypass AccountNotFound error
let ix = SystemInstruction::new_move(&from_pubkey, &to_pubkey, 50);
let mut tx = Transaction::new(vec![ix]);
alice_client.process_transaction(&mut tx).unwrap();
alice_client.transfer(50, &mallory_pubkey).unwrap();
// Erroneously sign transaction with recipient account key
// No signature case is tested by bank `test_zero_signatures()`
let ix = Instruction::new(
let malicious_script = vec![Instruction::new(
system_program::id(),
&SystemInstruction::Move { lamports: 10 },
vec![(from_pubkey, false), (to_pubkey, true)],
);
let mut tx = Transaction::new(vec![ix]);
vec![(alice_pubkey, false), (mallory_pubkey, true)],
)];
assert_eq!(
mallory_client.process_transaction(&mut tx),
mallory_client.process_script(malicious_script),
Err(TransactionError::InstructionError(
0,
InstructionError::ProgramError(ProgramError::MissingRequiredSignature)
))
);
assert_eq!(bank.get_balance(&from_pubkey), 50);
assert_eq!(bank.get_balance(&to_pubkey), 50);
assert_eq!(bank.get_balance(&alice_pubkey), 50);
assert_eq!(bank.get_balance(&mallory_pubkey), 50);
}

13
sdk/src/transaction.rs
View File

@ -71,7 +71,10 @@ impl<P, Q> GenericInstruction<P, Q> {
}
pub type Instruction = GenericInstruction<Pubkey, (Pubkey, bool)>;
pub type Script = Vec<Instruction>;
pub type CompiledInstruction = GenericInstruction<u8, u8>;
pub type CompiledScript = Vec<CompiledInstruction>;
impl CompiledInstruction {
pub fn serialize_with(mut writer: &mut Cursor<&mut [u8]>, ix: &Self) -> Result<(), Error> {
@ -163,12 +166,12 @@ pub struct Transaction {
pub program_ids: Vec<Pubkey>,
/// Programs that will be executed in sequence and committed in one atomic transaction if all
/// succeed.
pub instructions: Vec<CompiledInstruction>,
pub instructions: CompiledScript,
}
impl Transaction {
pub fn new(instructions: Vec<Instruction>) -> Self {
TransactionCompiler::new(instructions).compile()
pub fn new(script: Script) -> Self {
TransactionCompiler::new(script).compile()
}
pub fn new_with_blockhash_and_fee<T: Serialize>(
@ -224,7 +227,7 @@ impl Transaction {
recent_blockhash: Hash,
fee: u64,
program_ids: Vec<Pubkey>,
instructions: Vec<CompiledInstruction>,
instructions: CompiledScript,
) -> Self {
let mut account_keys: Vec<_> = from_keypairs
.iter()
@ -466,7 +469,7 @@ impl<'a> serde::de::Visitor<'a> for TransactionVisitor {
let program_ids: Vec<Pubkey> =
deserialize_vec_with(&mut rd, Transaction::deserialize_pubkey)
.map_err(Error::custom)?;
let instructions: Vec<CompiledInstruction> =
let instructions: CompiledScript =
deserialize_vec_with(&mut rd, CompiledInstruction::deserialize_from)
.map_err(Error::custom)?;
Ok(Transaction {