feat: hermes config generator

lib/default.nix

@@ -168,4 +168,29 @@ in {
         gomod2nix --outdir "$CURDIR"
       '';
     };
+  # `hermesModuleConfigToml { modules }).config.hermes.toml`
+  # will be a string to put into [config.toml](https://hermes.informal.systems/documentation/configuration/configure-hermes.html)
+  hermesModuleConfigToml = {modules}:
+    pkgs.lib.evalModules {
+      modules =
+        [
+          (
+            {
+              lib,
+              config,
+              ...
+            }: let
+              # please note that this is not `nixos service`(systemd/launchd),
+              # but just the "abstract" module that can be used to build other configurations:
+              # static config files, containers, vm, process manager, futher generator.
+              cfg = config.hermes;
+              base = import ../nixosModules/hermes/base.nix {inherit lib nix-std cfg;};
+            in {
+              options.hermes = base.options;
+              config.hermes.toml = base.config.toml;
+            }
+          )
+        ]
+        ++ modules;
+    };
 }

modules/nixosModules.nix

@@ -0,0 +1,11 @@
+{
+  inputs,
+  hermes,
+  ...
+}: let
+  std = inputs.nix-std;
+in {
+  flake.nixosModules = {
+    hermes = import ../../nixosModules/hermes/default.nix {inherit nix-std hermes;};
+  };
+}

modules/packages.nix

@@ -220,6 +220,15 @@
                 inherit (inputs) apalache-src;
               };
             }
+            # fails with gaia nill pointer, so need to have config builder for cosmos-sdk too
+            # {
+            #   hermes-test = import ../nixosTests/tests/hermes-test.nix {
+            #     inherit pkgs;
+            #     inherit (inputs) nix-std;
+            #     inherit (self'.packages) hermes;
+            #     gaia = self'.packages.gaia14;
+            #   };
+            # }
             {
               stargaze = import ../packages/stargaze.nix {
                 inherit (inputs) stargaze-src;

nixosModules/hermes/base.nix

@@ -0,0 +1,18 @@
+{
+  lib,
+  nix-std,
+  cfg,
+}:
+with lib; {
+  options = {
+    config = import ./config-options.nix {inherit lib;};
+    toml = mkOption {type = types.unique {message = "only one toml output";} types.str;};
+  };
+  config = {
+    toml = let
+      # remove `null` from toml render
+      sanitizedCfg = filterAttrsRecursive (_: v: v != null) cfg.config;
+    in
+      nix-std.lib.serde.toTOML sanitizedCfg;
+  };
+}

nixosModules/hermes/chain-options.nix

@@ -0,0 +1,256 @@
+# will be used to generate `[[chains]]` part of [config.toml](https://hermes.informal.systems/documentation/configuration/description.html)
+{lib}:
+with lib; {
+  # Required
+  id = mkOption {
+    type = types.str;
+    description = ''
+      Specify the chain ID.
+    '';
+  };
+  rpc_addr = mkOption {
+    type = types.str;
+    description = ''
+      Specify the RPC address and port where the chain RPC server listens on.
+    '';
+  };
+  grpc_addr = mkOption {
+    type = types.str;
+    description = ''
+      Specify the GRPC address and port where the chain GRPC server listens on.
+    '';
+  };
+
+  event_source = mkOption {
+    type = types.submodule {
+      options = {
+        mode = mkOption {
+          type = types.enum ["push" "pull"];
+          default = "push";
+          description = ''
+            Specify the mode of the event source.
+          '';
+        };
+        url = mkOption {
+          type = types.nullOr types.str;
+          default = null;
+          description = ''
+            Specify the WebSocket address and port where the chain WebSocket server listens on.
+          '';
+        };
+        batch_delay = mkOption {
+          type = types.nullOr types.str;
+          default = null;
+          description = ''
+            Specify the delay between batches of events.
+          '';
+        };
+        interval = mkOption {
+          type = types.nullOr types.str;
+          default = null;
+
+          description = ''
+            Specify the interval between requests for new events.
+          '';
+        };
+      };
+    };
+  };
+
+  account_prefix = mkOption {
+    type = types.str;
+    description = ''
+      Specify the prefix used by the chain.
+    '';
+  };
+  key_name = mkOption {
+    type = types.str;
+    description = ''
+      Specify the name of the private key to use for signing transactions. Required
+      <link xlink:href="httpsg://hermes.informal.systems/commands/keys/index.html#adding-keys">
+        See the Adding Keys chapter
+      </link>.
+    '';
+  };
+  key_store_type = mkOption {
+    type = types.enum ["Test" "Memory"];
+    default = "Test";
+  };
+  default_gas = mkOption {
+    type = types.ints.positive;
+    default = 100000000;
+  };
+  gas_price = mkOption {
+    type = types.submodule {
+      options = {
+        price = mkOption {
+          type = types.float;
+          description = ''
+            Specify the price per gas used of the fee to submit a transaction.
+          '';
+        };
+        denom = mkOption {
+          type = types.str;
+          description = ''
+            Specify the denomination of the fee to submit a transaction.
+          '';
+        };
+      };
+    };
+  };
+
+  address_type = mkOption {
+    type = types.submodule {
+      options = {
+        derivation = mkOption {
+          type = types.enum ["cosmos"];
+          default = "cosmos";
+          description = ''
+            Specify the derivation type of the address.
+          '';
+        };
+      };
+    };
+  };
+
+  packet_filter = mkOption {
+    default = {
+      policy = "allow";
+      list = [["*" "*"]];
+    };
+    type = types.submodule {
+      options = {
+        policy = mkOption {
+          type = types.enum ["allow" "deny"];
+          default = "allow";
+          description = ''
+            Specify the policy of the packet filter.
+          '';
+        };
+        list = mkOption {
+          type = types.listOf (types.listOf types.str);
+          default = [["*" "*"]];
+          description = ''
+            Specify the list of packet filters.
+          '';
+        };
+      };
+    };
+  };
+
+  # Optional
+  rpc_timeout = mkOption {
+    type = types.str;
+    default = "10s";
+    description = ''
+      Specify the maximum amount of time (duration) that the RPC requests should
+      take before timing out.
+    '';
+  };
+  store_prefix = mkOption {
+    type = types.str;
+    default = "ibc";
+    description = ''
+      Specify the store prefix used by the on-chain IBC modules.
+    '';
+  };
+  max_gas = mkOption {
+    type = types.ints.positive;
+    default = 3000000;
+    description = ''
+      Specify the maximum amount of gas to be used as the gas limit for a transaction.
+    '';
+  };
+  gas_multiplier = mkOption {
+    type = types.float;
+    default = 0.1;
+    description = ''
+      Specify by ratio to increase the gas estimate used to compute the fee,
+      to account for potential estimation error.
+    '';
+  };
+  max_msg_num = mkOption {
+    type = types.ints.positive;
+    default = 30;
+    description = ''
+      Specify how many IBC messages at most to include in a single transaction.
+    '';
+  };
+  max_tx_size = mkOption {
+    type = types.ints.positive;
+    default = 2097152;
+    description = ''
+      Specify the maximum size, in bytes, of each transaction that Hermes will submit.
+    '';
+  };
+  max_block_time = mkOption {
+    type = types.str;
+    default = "30s";
+    description = ''
+      Specify the maximum amount of time to wait for a new block to be committed.
+    '';
+  };
+  clock_drift = mkOption {
+    type = types.str;
+    default = "5s";
+    description = ''
+      Specify the maximum amount of time to tolerate a clock drift.
+      The clock drift parameter defines how much new (untrusted) header's time
+      can drift into the future.
+    '';
+  };
+  trusting_period = mkOption {
+    type = types.str;
+    default = "14days";
+    description = ''
+      Specify the amount of time to be used as the light client trusting period.
+      It should be significantly less than the unbonding period
+      (e.g. unbonding period = 3 weeks, trusting period = 2 weeks).
+    '';
+  };
+  trusted_node = mkOption {
+    type = types.bool;
+    default = false;
+  };
+  ccv_consumer_chain = mkOption {
+    type = types.bool;
+    default = false;
+  };
+
+  type = mkOption {
+    type = types.enum ["CosmosSdk"];
+    default = "CosmosSdk";
+    description = ''
+      Specify the type of the chain.
+    '';
+  };
+
+  trust_threshold = mkOption {
+    default = {
+      numerator = "1";
+      denominator = "3";
+    };
+    type = types.submodule {
+      options = {
+        numerator = mkOption {
+          type = types.str;
+          default = "1";
+          description = ''
+            Specify the trust threshold for the light client, ie. the maximum fraction of validators
+            which have changed between two blocks.
+            Warning: This is an advanced feature! Modify with caution.
+          '';
+        };
+        denominator = mkOption {
+          type = types.str;
+          default = "3";
+          description = ''
+            Specify the trust threshold for the light client, ie. the maximum fraction of validators
+            which have changed between two blocks.
+            Warning: This is an advanced feature! Modify with caution.
+          '';
+        };
+      };
+    };
+  };
+}