feat: dry run with fake sig

crate/Cargo.toml

@@ -18,7 +18,7 @@ nodejs = []
 web = []
 
 [build-dependencies]
-namada_tx = { git = "https://github.com/anoma/namada", tag="libs-v0.251.3" }
+namada_tx = { path = "/home/mj/Projects/heliax/namada/crates/tx" }
 
 [dependencies]
 aes-gcm = "0.10.3"
@@ -29,7 +29,7 @@ chrono = "0.4.22"
 getrandom = { version = "0.3.3", features = [] }
 gloo-utils = { version = "0.1.5", features = ["serde"] }
 js-sys = "0.3.60"
-namada_sdk = { git = "https://github.com/anoma/namada", tag="libs-v0.251.3", default-features = false }
+namada_sdk = { path = "/home/mj/Projects/heliax/namada/crates/sdk", default-features = false }
 password-hash = "0.5.0"
 rand = {version = "0.8.5"}
 rayon = { version = "1.8", optional = true }

crate/src/sdk/args.rs

@@ -3,7 +3,7 @@ use std::{path::PathBuf, str::FromStr};
 
 use namada_sdk::address::DecodeError;
 use namada_sdk::args::{
-    TxShieldedSource, TxShieldedTarget, TxTransparentSource, TxTransparentTarget,
+    DryRun, TxShieldedSource, TxShieldedTarget, TxTransparentSource, TxTransparentTarget
 };
 use namada_sdk::borsh::{BorshDeserialize, BorshSerialize};
 use namada_sdk::collections::HashMap;
@@ -1082,7 +1082,7 @@ fn tx_msg_into_args(tx_msg: &[u8]) -> Result<args::Tx, JsError> {
     };
 
     let args = args::Tx {
-        dry_run: None,
+        dry_run: Some(DryRun::Wrapper),
         dump_tx: None,
         force,
         ledger_address,
@@ -1100,6 +1100,8 @@ fn tx_msg_into_args(tx_msg: &[u8]) -> Result<args::Tx, JsError> {
         device_transport: Default::default(),
     };
 
+    web_sys::console::log_1(&format!("Tx args: {:?}", args).into());
+
     Ok(args)
 }
 

crate/src/sdk/mod.rs

@@ -36,12 +36,12 @@ use namada_sdk::masp_primitives::transaction::components::amount::I128Sum;
 use namada_sdk::masp_primitives::transaction::TxId;
 use namada_sdk::masp_primitives::zip32::{ExtendedFullViewingKey, ExtendedKey};
 use namada_sdk::rpc::{self, query_denom, query_epoch, InnerTxResult, TxAppliedEvents, TxResponse};
-use namada_sdk::signing::SigningData;
+use namada_sdk::signing::{mock_hw_sig, Signable, SigningData};
 use namada_sdk::string_encoding::Format;
 use namada_sdk::tendermint_rpc::Url;
 use namada_sdk::token::{Amount, DenominatedAmount};
 use namada_sdk::token::{MaspTxId, OptionExt};
-use namada_sdk::tx::data::{ResultCode, TxType};
+use namada_sdk::tx::data::{DryRunResult, ResultCode, TxType};
 use namada_sdk::tx::Section;
 use namada_sdk::tx::{
     build_batch, build_bond, build_claim_rewards, build_ibc_transfer, build_redelegation,
@@ -408,6 +408,20 @@ impl Sdk {
         Ok(event)
     }
 
+    pub async fn dry_run_tx(&self, tx_bytes: &[u8], pk: &str) -> Result<JsValue, JsValue> {
+        let mut tx = Tx::try_from_slice(tx_bytes).expect("Should be able to deserialize a Tx");
+
+        let pk = common::PublicKey::from_str(pk).unwrap();
+        mock_hw_sig(&mut tx, pk, Signable::FeeRawHeader);
+
+        let result = rpc::dry_run_tx(&self.namada, tx.to_bytes()).await.map_err(|e| JsValue::from_str(&e.to_string()))?;
+
+        let DryRunResult(_, gas_cost) = &result;
+
+        Ok(JsValue::from(u64::from(*gas_cost)))
+    }
+
+
     pub async fn broadcast_tx(&self, tx_bytes: &[u8], deadline: u64) -> Result<JsValue, JsValue> {
         #[derive(serde::Serialize)]
         struct TxErrResponse {
@@ -420,7 +434,6 @@ impl Sdk {
         let tx_hash = tx.header_hash().to_string();
 
         let response = self.namada.client().broadcast_tx_sync(tx.to_bytes()).await;
-
         match response {
             Ok(res) => {
                 if res.clone().code != 0.into() {

packages/lib/src/rpc/rpc.ts

@@ -239,6 +239,13 @@ export class Rpc {
     return deserialize(Buffer.from(response), TxResponseMsgValue);
   }
 
+  async dryRunTx(
+    signedTxBytes: Uint8Array,
+    publicKey: string,
+  ): Promise<number> {
+    return await this.sdk.dry_run_tx(signedTxBytes, publicKey);
+  }
+
   /**
    * Sync the shielded context
    * @async