nix | wb: add utxo_lsmt attrs for LedgerDB.V2LSM config

Author: mgmeier

nix/nixos/cardano-node-service.nix

@@ -117,6 +117,11 @@ let
                    hasPrometheus = map (n: if isInt n then n + i else n) baseConfig.hasPrometheus;
                  })
             )
+            // optionalAttrs (cfg.withUtxoHdLsmt i){
+              LedgerDB = {
+                Backend = "V2LSM";
+                LSMDatabasePath = cfg.lmdbDatabasePath i;
+              }
             // optionalAttrs (cfg.withUtxoHdLmdb i){
               LedgerDB = {
                 Backend = "V1LMDB";
@@ -427,7 +432,7 @@ in {
         default = null;
         apply = x : if lib.isFunction x then x else if x == null then _: null else _: x;
         description = ''
-          A node UTxO-HD LMDB path for performant disk I/O, for each instance.
+          A node UTxO-HD on-disk (LMDB or LSM-trees) path for performant disk I/O, for each instance.
           This could point to a direct-access SSD, with a specifically created journal-less file system and optimized mount options.
         '';
       };
@@ -802,6 +807,16 @@ in {
         '';
       };
 
+      withUtxoHdLsmt = mkOption {
+        type = funcToOr bool;
+        default = false;
+        apply = x: if lib.isFunction x then x else _: x;
+        description = ''
+          On a UTxO-HD enabled node, the in-memory backend is the default.
+          This activates the on-disk backend (LSM-Trees) instead.
+        '';
+      };
+
       extraArgs = mkOption {
         type = listOf str;
         default = [];

nix/workbench/service/nodes.nix

@@ -76,6 +76,7 @@ let
       # Allow for local clusters to have multiple LMDB directories in the same physical ssd_directory;
       # non-block producers (like the explorer node) keep using the in-memory backend
       withUtxoHdLmdb   = profile.node.utxo_lmdb && isProducer;
+      withUtxoHdLsmt   = profile.node.utxo_lsmt && isProducer;
       lmdbDatabasePath = liveTablesPath i;
 
       ## Combine:
@@ -127,8 +128,15 @@ let
                   LedgerDB = {
                     Backend = "V1LMDB";
                     LiveTablesPath = liveTablesPath i;
-                  };
-                })
+                  }
+                } // optionalAttrs (profile.node.utxo_lsmt && isProducer)
+                {
+                  LedgerDB = {
+                    Backend = "V2LSM";
+                    LSMDatabasePath = liveTablesPath i;
+                  }
+                };
+                )
               (if __hasAttr "preset" profile && profile.preset != null
                ## It's either an undisturbed preset,
                ## or a hardforked setup.