feat: add sim_only to print assembled transaction

cmd/soroban-cli/src/commands/contract/deploy/asset.rs

@@ -103,7 +103,7 @@ impl NetworkRunnable for Cmd {
         )?;
         self.fee.exit_if_build_only(&tx)?;
         let txn = client.create_assembled_transaction(&tx).await?;
-        let txn = self.fee.apply_to_assembled_txn(txn);
+        let txn = self.fee.apply_to_assembled_txn(txn)?;
         client
             .send_assembled_transaction(txn, &key, &[], network_passphrase, None, None)
             .await?;

cmd/soroban-cli/src/commands/contract/deploy/wasm.rs

@@ -168,7 +168,7 @@ impl NetworkRunnable for Cmd {
         )?;
         self.fee.exit_if_build_only(&txn)?;
         let txn = client.create_assembled_transaction(&txn).await?;
-        let txn = self.fee.apply_to_assembled_txn(txn);
+        let txn = self.fee.apply_to_assembled_txn(txn)?;
         client
             .send_assembled_transaction(txn, &key, &[], &network.network_passphrase, None, None)
             .await?;

cmd/soroban-cli/src/commands/contract/install.rs

@@ -129,7 +129,7 @@ impl NetworkRunnable for Cmd {
         let txn = client
             .create_assembled_transaction(&tx_without_preflight)
             .await?;
-        let txn = self.fee.apply_to_assembled_txn(txn);
+        let txn = self.fee.apply_to_assembled_txn(txn)?;
 
         // Currently internal errors are not returned if the contract code is expired
         if let Some(TransactionResult {

cmd/soroban-cli/src/commands/contract/invoke.rs

@@ -336,7 +336,7 @@ impl NetworkRunnable for Cmd {
         )?;
         self.fee.exit_if_build_only(&tx)?;
         let txn = client.create_assembled_transaction(&tx).await?;
-        let txn = self.fee.apply_to_assembled_txn(txn);
+        let txn = self.fee.apply_to_assembled_txn(txn)?;
         let (return_value, events) = if self.is_view() {
             (
                 txn.sim_response().results()?[0].xdr.clone(),

cmd/soroban-cli/src/fee.rs

@@ -17,9 +17,12 @@ pub struct Args {
     /// Number of instructions to simulate
     #[arg(long, help_heading = HEADING_RPC)]
     pub instructions: Option<u32>,
-    /// Build the transaction only write the output to stdout
+    /// Build the transaction only write the base64 xdr to stdout
     #[arg(long, help_heading = HEADING_RPC)]
     pub build_only: bool,
+    /// Simulation the transaction only write the base64 to stdout
+    #[arg(long, help_heading = HEADING_RPC, conflicts_with = "build_only")]
+    pub sim_only: bool,
 }
 
 impl Args {
@@ -31,12 +34,22 @@ impl Args {
         Ok(())
     }
 
-    pub fn apply_to_assembled_txn(&self, txn: Assembled) -> Assembled {
-        if let Some(instructions) = self.instructions {
+    pub fn apply_to_assembled_txn(&self, txn: Assembled) -> Result<Assembled, xdr::Error> {
+        let simulated_txn = if let Some(instructions) = self.instructions {
             txn.set_max_instructions(instructions)
         } else {
             add_padding_to_instructions(txn)
+        };
+        if self.sim_only {
+            println!(
+                "{}",
+                simulated_txn
+                    .transaction()
+                    .to_xdr_base64(xdr::Limits::none())?
+            );
+            std::process::exit(0);
         }
+        Ok(simulated_txn)
     }
 }
 
@@ -60,6 +73,7 @@ impl Default for Args {
             cost: false,
             instructions: None,
             build_only: false,
+            sim_only: false,
         }
     }
 }

docs/soroban-cli-full-docs.md

@@ -579,7 +579,11 @@ Deploy builtin Soroban Asset Contract
   Possible values: `true`, `false`
 
 * `--instructions <INSTRUCTIONS>` — Number of instructions to simulate
-* `--build-only` — Build the transaction only write the output to stdout
+* `--build-only` — Build the transaction only write the base64 xdr to stdout
+
+  Possible values: `true`, `false`
+
+* `--sim-only` — Simulation the transaction only write the base64 to stdout
 
   Possible values: `true`, `false`
 
@@ -734,7 +738,11 @@ If no keys are specified the contract itself is extended.
   Possible values: `true`, `false`
 
 * `--instructions <INSTRUCTIONS>` — Number of instructions to simulate
-* `--build-only` — Build the transaction only write the output to stdout
+* `--build-only` — Build the transaction only write the base64 xdr to stdout
+
+  Possible values: `true`, `false`
+
+* `--sim-only` — Simulation the transaction only write the base64 to stdout
 
   Possible values: `true`, `false`
 
@@ -770,7 +778,11 @@ Deploy a wasm contract
   Possible values: `true`, `false`
 
 * `--instructions <INSTRUCTIONS>` — Number of instructions to simulate
-* `--build-only` — Build the transaction only write the output to stdout
+* `--build-only` — Build the transaction only write the base64 xdr to stdout
+
+  Possible values: `true`, `false`
+
+* `--sim-only` — Simulation the transaction only write the base64 to stdout
 
   Possible values: `true`, `false`
 
@@ -938,7 +950,11 @@ Install a WASM file to the ledger without creating a contract instance
   Possible values: `true`, `false`
 
 * `--instructions <INSTRUCTIONS>` — Number of instructions to simulate
-* `--build-only` — Build the transaction only write the output to stdout
+* `--build-only` — Build the transaction only write the base64 xdr to stdout
+
+  Possible values: `true`, `false`
+
+* `--sim-only` — Simulation the transaction only write the base64 to stdout
 
   Possible values: `true`, `false`
 
@@ -991,7 +1007,11 @@ soroban contract invoke ... -- --help
   Possible values: `true`, `false`
 
 * `--instructions <INSTRUCTIONS>` — Number of instructions to simulate
-* `--build-only` — Build the transaction only write the output to stdout
+* `--build-only` — Build the transaction only write the base64 xdr to stdout
+
+  Possible values: `true`, `false`
+
+* `--sim-only` — Simulation the transaction only write the base64 to stdout
 
   Possible values: `true`, `false`
 
@@ -1107,7 +1127,11 @@ If no keys are specificed the contract itself is restored.
   Possible values: `true`, `false`
 
 * `--instructions <INSTRUCTIONS>` — Number of instructions to simulate
-* `--build-only` — Build the transaction only write the output to stdout
+* `--build-only` — Build the transaction only write the base64 xdr to stdout
+
+  Possible values: `true`, `false`
+
+* `--sim-only` — Simulation the transaction only write the base64 to stdout
 
   Possible values: `true`, `false`
 
@@ -1400,7 +1424,11 @@ Deploy a token contract to wrap an existing Stellar classic asset for smart cont
   Possible values: `true`, `false`
 
 * `--instructions <INSTRUCTIONS>` — Number of instructions to simulate
-* `--build-only` — Build the transaction only write the output to stdout
+* `--build-only` — Build the transaction only write the base64 xdr to stdout
+
+  Possible values: `true`, `false`
+
+* `--sim-only` — Simulation the transaction only write the base64 to stdout
 
   Possible values: `true`, `false`