Add IBC fees to IbcMsg::Transfer and ::SendPacket

packages/std/src/ibc.rs

@@ -36,6 +36,13 @@ pub enum IbcMsg {
         amount: Coin,
         /// when packet times out, measured on remote chain
         timeout: IbcTimeout,
+        /// When set, a [MsgPayPacketFee] with the provided fee is created and
+        /// emitted before the packet is sent.
+        /// `signer` gets filled automatically with the contract address.
+        /// No relayer restrictions will be in place.
+        ///
+        /// [MsgPayPacketFee]: https://github.com/cosmos/ibc-go/blob/v7.2.0/proto/ibc/applications/fee/v1/tx.proto#L76-L93
+        packet_fee: Option<IbcFee>,
     },
     /// Sends an IBC packet with given data over the existing channel.
     /// Data should be encoded in a format defined by the channel version,
@@ -45,12 +52,29 @@ pub enum IbcMsg {
         data: Binary,
         /// when packet times out, measured on remote chain
         timeout: IbcTimeout,
+        /// When set, a [MsgPayPacketFee] with the provided fee is created and
+        /// emitted before the packet is sent.
+        /// `signer` gets filled automatically with the contract address.
+        /// No relayer restrictions will be in place.
+        ///
+        /// [MsgPayPacketFee]: https://github.com/cosmos/ibc-go/blob/v7.2.0/proto/ibc/applications/fee/v1/tx.proto#L76-L93
+        packet_fee: Option<IbcFee>,
     },
     /// This will close an existing channel that is owned by this contract.
     /// Port is auto-assigned to the contract's IBC port
     CloseChannel { channel_id: String },
 }
 
+#[derive(Serialize, Deserialize, Clone, Debug, Default, PartialEq, Eq, JsonSchema)]
+pub struct IbcFee {
+    /// The packet receive fee
+    pub recv: Vec<Coin>,
+    /// The packet acknowledgement fee
+    pub ack: Vec<Coin>,
+    /// The packet timeout fee
+    pub timeout: Vec<Coin>,
+}
+
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, JsonSchema)]
 pub struct IbcEndpoint {
     pub port_id: String,