Lower gas costs on mainnet for some tokens

Cargo.toml

@@ -11,7 +11,7 @@ members = [
     "proposals/mainnet_phases/phase5a",
     "proposals/mainnet_phases/phase5b",
     "proposals/mainnet/update-staking-inflation-parameters",
-    "proposals/testnet/add-uusdc-gas-token",
+    "proposals/testnet/add-uusdc-gas-token", "proposals/mainnet/update-gas-costs",
 ]
 
 [workspace.package]
@@ -22,9 +22,7 @@ version = "1.0.0"
 
 [workspace.dependencies]
 namada_tx_prelude_01502 = { package = "namada_tx_prelude", git = "https://github.com/anoma/namada", tag = "libs-v0.150.2" }
-namada_tx_prelude_02512 = { package = "namada_tx_prelude", git = "https://github.com/anoma/namada", tag = "libs-v0.251.2" }
 namada_proof_of_stake_01502 = { package = "namada_proof_of_stake", git = "https://github.com/anoma/namada", tag = "libs-v0.150.2" }
-namada_proof_of_stake_02512 = { package = "namada_proof_of_stake", git = "https://github.com/anoma/namada", tag = "libs-v0.251.2" }
 
 rlsf = "0.2.1"
 getrandom = { version = "0.2", features = ["custom"] }

proposals/mainnet/update-gas-costs/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "update-gas-costs"
+description = "WASM transaction to write minimum gas costs for desired tokens."
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+version.workspace = true
+
+[dependencies]
+namada_tx_prelude_01502.workspace = true
+rlsf.workspace = true
+getrandom.workspace = true
+
+[lib]
+crate-type = ["cdylib"]

proposals/mainnet/update-gas-costs/data.json

@@ -0,0 +1,15 @@
+{
+    "rust-version": "1.85.1",
+    "proposal": {
+        "title": "Insert title.",
+        "authors": "Bob The Builer <[email protected]>",
+        "discussions-to": "www.bob-the-builder.forum.rock",
+        "abstract": "OPTIONAL: You can put an abstract here if you'd like.",
+        "motivation": "OPTIONAL: You can put a motivation here if you'd like.",
+        "details": "Put proposal details here.",
+        "author": "tnam1qxfj3sf6a0meahdu9t6znp05g8zx4dkjtgyn9gfu",
+        "voting_start_epoch": 6,
+        "voting_end_epoch": 12,
+        "activation_epoch": 18
+    }
+}

proposals/mainnet/update-gas-costs/src/lib.rs

@@ -0,0 +1,64 @@
+use std::collections::BTreeMap;
+
+use namada_tx_prelude::*;
+use namada_tx_prelude_01502::{self as namada_tx_prelude, parameters_storage::get_gas_cost_key};
+
+pub type ChannelId = &'static str;
+pub type BaseToken = &'static str;
+
+pub type Gas = token::Amount;
+
+const IBC_TOKENS: [(ChannelId, BaseToken, Gas); 6] = [
+    (
+        "channel-0",
+        "stuosmo",
+        Gas::from_u64(3), // 3 stuosmo / gas unit
+    ),
+    (
+        "channel-1",
+        "uosmo",
+        Gas::from_u64(3), // 3 uosmo / gas unit
+    ),
+    (
+        "channel-4",
+        "upenumbra",
+        Gas::from_u64(3), // 3 upenumbra / gas unit;
+    ),
+    (
+        "channel-5",
+        "uusdc",
+        Gas::from_u64(1), // 1 uusdc / gas unit;
+    ),
+    (
+        "channel-6",
+        "unym",
+        Gas::from_u64(15), // 15 unym / gas unit;
+    ),
+    (
+        "channel-7",
+        "untrn",
+        Gas::from_u64(7), // 7 untrn / gas unit;
+    ),
+];
+
+#[transaction]
+fn apply_tx(ctx: &mut Ctx, _tx_data: BatchedTx) -> TxResult {
+    // Read the current gas cost map
+    let gas_cost_key = get_gas_cost_key();
+    let mut minimum_gas_price: BTreeMap<Address, token::Amount> =
+        ctx.read(&gas_cost_key)?.unwrap_or_default();
+
+    // Enable IBC deposit/withdraws limits
+    for (channel_id, base_token, gas) in IBC_TOKENS {
+        let ibc_denom = format!("transfer/{channel_id}/{base_token}");
+        let token_address = ibc::ibc_token(&ibc_denom).clone();
+
+        // Check if this ibc token should can also be used to pay for gas
+        minimum_gas_price.insert(token_address.clone(), gas);
+    }
+
+    // Write the gas cost map back to storage
+    ctx.write(&gas_cost_key, minimum_gas_price)?;
+
+    Ok(())
+}