benchTracer: add a flag to toggle legacy and new nixos svc use

nix/nixos/cardano-tracer-service.nix

@@ -109,6 +109,7 @@ with builtins; let
     echo "..or, once again, in a single line:"
     echo "${toString cmd}"
 
+    trap 'RC="$?"; echo "Service binary 'cardano-tracer' returned status: $RC" >&2; exit $RC' EXIT
     ${toString cmd}
   '';
 in {
@@ -244,7 +245,7 @@ in {
 
       executable = mkOption {
         type = str;
-        default = "exec ${cfg.package}/bin/cardano-tracer";
+        default = "${cfg.package}/bin/cardano-tracer";
         defaultText = "cardano-node";
         description = ''
           The cardano-tracer executable invocation to use.
@@ -359,7 +360,7 @@ in {
       };
 
       metricsComp = mkOption {
-        type = nullOr (attrsOf str);
+        type = nullOr (either str (attrsOf str));
         default = null;
         description = ''
           Passing metric compatability mapping to cardano-tracer can be done as
@@ -369,10 +370,8 @@ in {
           original name and mapped name.  Only one mapping per message is
           supported.
 
-          If such a set is already available as JSON, this also can be imported:
-
-            services.cardano-tracer.metricsComp =
-              builtins.fromJSON (builtins.readFile $PATH);
+          If such a set is already available as JSON in a file, this option can
+          be declared as a string of the path to such file.
 
           Any metrics prefix name declared with `TraceOptionMetricsPrefix` in
           cardano-node config should not be included in the attribute name.
@@ -386,18 +385,16 @@ in {
       };
 
       metricsHelp = mkOption {
-        type = nullOr (attrsOf str);
+        type = nullOr (either str (attrsOf str));
         default = null;
         description = ''
           Passing metric help annotations to cardano-tracer can be done as a an
           attribute set of strings from metric name to help text where
           cardano-tracer's internal metric names have to be used as attribute
           names.
 
-          If such a set is already available as JSON, this also can be imported:
-
-            services.cardano-tracer.metricsHelp =
-              builtins.fromJSON (builtins.readFile $PATH);
+          If such a set is already available as JSON in a file, this option can
+          be declared as a string of the path to such file.
 
           Any metrics prefix name declared with `TraceOptionMetricsPrefix` in
           cardano-node config should not be included in the attribute name.
@@ -690,13 +687,24 @@ in {
         '';
       };
 
-      stateDir = mkOption {
+      script = mkOption {
         type = str;
+        default = mkScript;
+        internal = true;
+        description = ''
+        '';
+      };
+
+      stateDir = mkOption {
+        type = nullOr str;
         default = "${cfg.stateDirBase}cardano-tracer";
         description = ''
           The directory to store any cardano-tracer process related data.
 
           RTView if enabled will save its state in this directory.
+
+          For non-systemd use cases, this can be set to null or any other
+          string path.
         '';
       };
 
@@ -708,6 +716,16 @@ in {
         '';
       };
 
+      tracerConfig = mkOption {
+        type = attrs;
+        default = tracerConfig;
+        internal = true;
+        description = ''
+          The default nixos tracerConfig attribute set used in workbench
+          profile generation.
+        '';
+      };
+
       user = mkOption {
         type = str;
         default = "cardano-node";

nix/workbench/service/tracer.nix

@@ -9,6 +9,9 @@
 with pkgs.lib;
 
 let
+  # For testing legacy to new cardano-tracer-service transition
+  # useLegacyTracerService = true;
+  useLegacyTracerService = false;
 
   ## Given an env config, evaluate it and produce the service.
   ##
@@ -18,17 +21,12 @@ let
     let
       tracerConfig =
         {
+          enable = true;
           ## In both the local and remote scenarios, it's most frequently
           ## convenient to act as an acceptor.
           acceptingSocket = "tracer.socket";
           networkMagic = profile.genesis.network_magic;
-          dsmPassthrough = {
-            # rtsOpts = ["-xc"];
-          } // optionalAttrs (profile.tracer.withresources or false) {
-            rtsOpts = [ "-scardano-tracer.gcstats" ];
-          };
           configFile     = "config.json";
-          logRoot        = ".";
           metricsHelp    = "../../../cardano-tracer/configuration/metrics_help.json";
         } // optionalAttrs backend.useCabalRun {
           executable     = "cardano-tracer";
@@ -39,6 +37,25 @@ let
           };
         } // optionalAttrs (profile.tracer.withresources or false) {
           resourceFreq = 1000;
+        } // optionalAttrs useLegacyTracerService {
+          dsmPassthrough = {
+            # rtsOpts = ["-xc"];
+          } // optionalAttrs (profile.tracer.withresources or false) {
+            rtsOpts = [ "-scardano-tracer.gcstats" ];
+          };
+          logRoot    = ".";
+        } // optionalAttrs (!useLegacyTracerService) {
+          logging = [
+            {
+              logRoot    = ".";
+              logMode    = "FileMode";
+              logFormat  = "ForMachine";
+            }
+          ];
+          rtsArgs =
+            # ["-xc"] ++
+            optionals (profile.tracer.withresources or false) ["-scardano-tracer.gcstats"];
+          stateDir = null;
         }
       ;
       systemdCompat.options = {
@@ -48,29 +65,26 @@ let
         assertions = mkOption {};
         environment = mkOption {};
       };
-      eval =
-        let
-          extra = {
-            services.cardano-tracer = {
-              enable = true;
-            } // tracerConfig;
-          };
-        in evalModules {
-          prefix = [];
-         modules = [
-                     (import ../../nixos/cardano-node-service.nix)
-                     (import ../../nixos/cardano-submit-api-service.nix)
-                     # (import ../../nixos/cardano-tracer-service.nix)
-                     (import ../../nixos/cardano-tracer-service-legacy.nix pkgs)
-                     systemdCompat
-                     extra
-                     { config._module.args = { inherit pkgs; }; }
-                   ]
-                   ++ [ backend.service-modules.tracer or {} ]
+      eval = evalModules {
+        prefix = [];
+
+        modules = [
+          (import ../../nixos/cardano-node-service.nix)
+          (import ../../nixos/cardano-submit-api-service.nix)
+          # (import ../../nixos/cardano-tracer-service.nix)
+          { config._module.args = { inherit pkgs; }; }
+          { services.cardano-tracer = tracerConfig; }
+          systemdCompat
+        ]
+          ++ [ backend.service-modules.tracer or {} ]
+          ++ optionals useLegacyTracerService
+            [ (import ../../nixos/cardano-tracer-service-legacy.nix pkgs) ]
+          ++ optionals (!useLegacyTracerService)
+            [ (import ../../nixos/cardano-tracer-service.nix) ]
           ;
-          # args = { inherit pkgs; };
-        }
-      ;
+
+        # args = { inherit pkgs; };
+      };
     in
       eval.config.services.cardano-tracer;
 
@@ -81,18 +95,20 @@ let
     (nodeSpecs:
     let
       nixosServiceConfig    = tracerConfigServiceConfig;
-      execConfig            = nixosServiceConfig.configJSONfn nixosServiceConfig;
+        execConfig          = if useLegacyTracerService
+                              then nixosServiceConfig.configJSONfn nixosServiceConfig
+                              else nixosServiceConfig.tracerConfig;
     in {
       start = rec {
-        value = ''
+        value = traceVal ''
           #!${pkgs.stdenv.shell}
 
           ${nixosServiceConfig.script}
           '';
         JSON = pkgs.writeScript "startup-tracer.sh" value;
       };
 
-      config = rec {
+      config = {
         value = execConfig;
         JSON  = jsonFilePretty "config.json" (__toJSON execConfig);
       };