decouple host params (#12)

* decouple host params

* introduce RequestMetadata

* modify dispatchIncoming

* fix solidity

src/IIsmpHost.sol

@@ -4,26 +4,12 @@ pragma solidity 0.8.17;
 import {StateCommitment, StateMachineHeight} from "./IConsensusClient.sol";
 import {IIsmp, PostRequest, PostResponse, GetResponse, PostTimeout, GetRequest} from "./IIsmp.sol";
 
-// The IsmpHost parameters
-struct HostParams {
-    // default timeout in seconds for requests.
-    uint256 defaultTimeout;
-    // timestamp for when the consensus was most recently updated
-    uint256 lastUpdated;
-    // unstaking period
-    uint256 unStakingPeriod;
-    // minimum challenge period in seconds;
-    uint256 challengePeriod;
-    // consensus client contract
-    address consensusClient;
-    // admin account, this only has the rights to freeze, or unfreeze the bridge
-    address admin;
-    // Ismp request/response handler
-    address handler;
-    // the authorized cross-chain governor contract
-    address crosschainGovernor;
-    // current verified state of the consensus client;
-    bytes consensusState;
+// Some metadata about the request
+struct RequestMetadata {
+    // the relayer fee
+    uint256 fee;
+    // user who initiated the request
+    address sender;
 }
 
 interface IIsmpHost is IIsmp {
@@ -101,7 +87,7 @@ interface IIsmpHost is IIsmp {
      * @param commitment - commitment to the request
      * @return existence status of an outgoing request commitment
      */
-    function requestCommitments(bytes32 commitment) external returns (bool);
+    function requestCommitments(bytes32 commitment) external returns (RequestMetadata memory);
 
     /**
      * @param commitment - commitment to the response
@@ -125,12 +111,6 @@ interface IIsmpHost is IIsmp {
      */
     function storeConsensusState(bytes memory state) external;
 
-    /**
-     * @dev Updates bridge params
-     * @param params new bridge params
-     */
-    function setHostParams(HostParams memory params) external;
-
     /**
      * @dev Store the timestamp when the consensus client was updated
      * @param timestamp - new timestamp
@@ -180,11 +160,11 @@ interface IIsmpHost is IIsmp {
      * @dev Dispatch an incoming get timeout to source module
      * @param timeout - get timeout
      */
-    function dispatchIncoming(GetRequest memory timeout) external;
+    function dispatchIncoming(GetRequest memory timeout, RequestMetadata memory meta, bytes32 commitment) external;
 
     /**
      * @dev Dispatch an incoming post timeout to source module
      * @param timeout - post timeout
      */
-    function dispatchIncoming(PostTimeout memory timeout) external;
+    function dispatchIncoming(PostTimeout memory timeout, RequestMetadata memory meta, bytes32 commitment) external;
 }