Add unit test for get_witnesses_weight

diff --git a/src/ln/channelmonitor.rs b/src/ln/channelmonitor.rs
index c628411fc0657b8e4199a499e7194e50e0a68a8e..c279c2c4071dddddd06612f3962b330857c0f858 100644 (file)
--- a/src/ln/channelmonitor.rs
+++ b/src/ln/channelmonitor.rs
@@ -342,6 +342,7 @@ struct LocalSignedTx {
        htlc_outputs: Vec<(HTLCOutputInCommitment, Option<(Signature, Signature)>, Option<HTLCSource>)>,
 }
 
+#[derive(PartialEq)]
 enum InputDescriptors {
        RevokedOfferedHTLC,
        RevokedReceivedHTLC,
@@ -2274,13 +2275,19 @@ impl<R: ::std::io::Read> ReadableArgs<R, Arc<Logger>> for (Sha256dHash, ChannelM
 
 #[cfg(test)]
 mod tests {
-       use bitcoin::blockdata::script::Script;
-       use bitcoin::blockdata::transaction::Transaction;
+       use bitcoin::blockdata::script::{Script, Builder};
+       use bitcoin::blockdata::opcodes;
+       use bitcoin::blockdata::transaction::{Transaction, TxIn, TxOut, SigHashType};
+       use bitcoin::blockdata::transaction::OutPoint as BitcoinOutPoint;
+       use bitcoin::util::bip143;
        use bitcoin_hashes::Hash;
        use bitcoin_hashes::sha256::Hash as Sha256;
+       use bitcoin_hashes::sha256d::Hash as Sha256dHash;
+       use bitcoin_hashes::hex::FromHex;
        use hex;
        use ln::channelmanager::{PaymentPreimage, PaymentHash};
-       use ln::channelmonitor::ChannelMonitor;
+       use ln::channelmonitor::{ChannelMonitor, InputDescriptors};
+       use ln::chan_utils;
        use ln::chan_utils::{HTLCOutputInCommitment, TxCreationKeys};
        use util::test_utils::TestLogger;
        use secp256k1::key::{SecretKey,PublicKey};
@@ -2757,5 +2764,117 @@ mod tests {
                test_preimages_exist!(&preimages[0..5], monitor);
        }
 
+       #[test]
+       fn test_claim_txn_weight_computation() {
+               // We test Claim txn weight, knowing that we want expected weigth and
+               // not actual case to avoid sigs and time-lock delays hell variances.
+
+               let secp_ctx = Secp256k1::new();
+               let privkey = SecretKey::from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap();
+               let pubkey = PublicKey::from_secret_key(&secp_ctx, &privkey);
+               let mut sum_actual_sigs: u64 = 0;
+
+               macro_rules! sign_input {
+                       ($sighash_parts: expr, $input: expr, $idx: expr, $amount: expr, $input_type: expr, $sum_actual_sigs: expr) => {
+                               let htlc = HTLCOutputInCommitment {
+                                       offered: if *$input_type == InputDescriptors::RevokedOfferedHTLC || *$input_type == InputDescriptors::OfferedHTLC { true } else { false },
+                                       amount_msat: 0,
+                                       cltv_expiry: 2 << 16,
+                                       payment_hash: PaymentHash([1; 32]),
+                                       transaction_output_index: Some($idx),
+                               };
+                               let redeem_script = if *$input_type == InputDescriptors::RevokedOutput { chan_utils::get_revokeable_redeemscript(&pubkey, 256, &pubkey) } else { chan_utils::get_htlc_redeemscript_with_explicit_keys(&htlc, &pubkey, &pubkey, &pubkey) };
+                               let sighash = hash_to_message!(&$sighash_parts.sighash_all(&$input, &redeem_script, $amount)[..]);
+                               let sig = secp_ctx.sign(&sighash, &privkey);
+                               $input.witness.push(sig.serialize_der().to_vec());
+                               $input.witness[0].push(SigHashType::All as u8);
+                               sum_actual_sigs += $input.witness[0].len() as u64;
+                               if *$input_type == InputDescriptors::RevokedOutput {
+                                       $input.witness.push(vec!(1));
+                               } else if *$input_type == InputDescriptors::RevokedOfferedHTLC || *$input_type == InputDescriptors::RevokedReceivedHTLC {
+                                       $input.witness.push(pubkey.clone().serialize().to_vec());
+                               } else if *$input_type == InputDescriptors::ReceivedHTLC {
+                                       $input.witness.push(vec![0]);
+                               } else {
+                                       $input.witness.push(PaymentPreimage([1; 32]).0.to_vec());
+                               }
+                               $input.witness.push(redeem_script.into_bytes());
+                               println!("witness[0] {}", $input.witness[0].len());
+                               println!("witness[1] {}", $input.witness[1].len());
+                               println!("witness[2] {}", $input.witness[2].len());
+                       }
+               }
+
+               let script_pubkey = Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script();
+               let txid = Sha256dHash::from_hex("56944c5d3f98413ef45cf54545538103cc9f298e0575820ad3591376e2e0f65d").unwrap();
+
+               // Justice tx with 1 to_local, 2 revoked offered HTLCs, 1 revoked received HTLCs
+               let mut claim_tx = Transaction { version: 0, lock_time: 0, input: Vec::new(), output: Vec::new() };
+               for i in 0..4 {
+                       claim_tx.input.push(TxIn {
+                               previous_output: BitcoinOutPoint {
+                                       txid,
+                                       vout: i,
+                               },
+                               script_sig: Script::new(),
+                               sequence: 0xfffffffd,
+                               witness: Vec::new(),
+                       });
+               }
+               claim_tx.output.push(TxOut {
+                       script_pubkey: script_pubkey.clone(),
+                       value: 0,
+               });
+               let base_weight = claim_tx.get_weight() + 2; // segwit flag, not added because lack of witness input at this step
+               let sighash_parts = bip143::SighashComponents::new(&claim_tx);
+               let inputs_des = vec![InputDescriptors::RevokedOutput, InputDescriptors::RevokedOfferedHTLC, InputDescriptors::RevokedOfferedHTLC, InputDescriptors::RevokedReceivedHTLC];
+               for (idx, inp) in claim_tx.input.iter_mut().zip(inputs_des.iter()).enumerate() {
+                       sign_input!(sighash_parts, inp.0, idx as u32, 0, inp.1, sum_actual_sigs);
+               }
+               assert_eq!(base_weight + ChannelMonitor::get_witnesses_weight(&inputs_des),  claim_tx.get_weight() + /* max_length_sig */ (73 * inputs_des.len() as u64 - sum_actual_sigs));
+
+               // Claim tx with 1 offered HTLCs, 3 received HTLCs
+               claim_tx.input.clear();
+               sum_actual_sigs = 0;
+               for i in 0..4 {
+                       claim_tx.input.push(TxIn {
+                               previous_output: BitcoinOutPoint {
+                                       txid,
+                                       vout: i,
+                               },
+                               script_sig: Script::new(),
+                               sequence: 0xfffffffd,
+                               witness: Vec::new(),
+                       });
+               }
+               let base_weight = claim_tx.get_weight() + 2;
+               let sighash_parts = bip143::SighashComponents::new(&claim_tx);
+               let inputs_des = vec![InputDescriptors::OfferedHTLC, InputDescriptors::ReceivedHTLC, InputDescriptors::ReceivedHTLC, InputDescriptors::ReceivedHTLC];
+               for (idx, inp) in claim_tx.input.iter_mut().zip(inputs_des.iter()).enumerate() {
+                       sign_input!(sighash_parts, inp.0, idx as u32, 0, inp.1, sum_actual_sigs);
+               }
+               assert_eq!(base_weight + ChannelMonitor::get_witnesses_weight(&inputs_des),  claim_tx.get_weight() + /* max_length_sig */ (73 * inputs_des.len() as u64 - sum_actual_sigs));
+
+               // Justice tx with 1 revoked HTLC-Success tx output
+               claim_tx.input.clear();
+               sum_actual_sigs = 0;
+               claim_tx.input.push(TxIn {
+                       previous_output: BitcoinOutPoint {
+                               txid,
+                               vout: 0,
+                       },
+                       script_sig: Script::new(),
+                       sequence: 0xfffffffd,
+                       witness: Vec::new(),
+               });
+               let base_weight = claim_tx.get_weight() + 2;
+               let sighash_parts = bip143::SighashComponents::new(&claim_tx);
+               let inputs_des = vec![InputDescriptors::RevokedOutput];
+               for (idx, inp) in claim_tx.input.iter_mut().zip(inputs_des.iter()).enumerate() {
+                       sign_input!(sighash_parts, inp.0, idx as u32, 0, inp.1, sum_actual_sigs);
+               }
+               assert_eq!(base_weight + ChannelMonitor::get_witnesses_weight(&inputs_des), claim_tx.get_weight() + /* max_length_isg */ (73 * inputs_des.len() as u64 - sum_actual_sigs));
+       }
+
        // Further testing is done in the ChannelManager integration tests.
 }