Simple configuration of federation senders

synapse-module/default.nix

@@ -55,7 +55,39 @@ in
       default = lib.readFile ./matrix-synapse-log_config.yaml;
     };
 
-    workers = lib.mkOption {
+    workers = let
+      inherit (lib.lists) any;
+      isReplication = l: any (r: any (n: n == "replication") r.names) l.resources;
+
+      dMRL = lib.lists.findFirst isReplication
+        (throw "No replication listener configured!")
+        cfg.settings.listeners;
+
+      dMRH = lib.findFirst (x: true) (throw "Replication listener had no addresses")
+        dMRL.bind_addresses;
+      dMRP = dMRL.port;
+    in {
+      enable = lib.mkEnableOption "synapse worker support";
+
+      mainReplicationHost = lib.mkOption {
+        type = lib.types.str;
+        default = dMRH;
+        description = "Host of the main synapse instance's replication listener";
+      };
+
+      mainReplicationPort = lib.mkOption {
+        type = lib.types.port;
+        default = dMRP;
+        description = "Port for the main synapse instance's replication listener";
+      };
+
+      federationSenders = lib.mkOption {
+        type = lib.types.ints.positive;
+        description = "How many automatically configured federation senders to set up";
+        default = 0;
+      };
+
+      instances = lib.mkOption {
         type = lib.types.attrsOf (lib.types.submodule ({config, ...}: {
           options.settings = lib.mkOption {
             type = lib.types.submodule {
@@ -69,17 +101,17 @@ in
                   "synapse.app.federation_sender"
                   "synapse.app.media_repository"
                   "synapse.app.user_dir"
-                "synapse.app.frontend_proxy"
                 ];
                 description = "The type of worker application";
               };
               options.worker_replication_host = lib.mkOption {
                 type = lib.types.str;
+                default = cfg.workers.mainReplicationHost;
                 description = "The replication listeners ip on the main synapse process";
-              default = "127.0.0.1";
               };
               options.worker_replication_http_port = lib.mkOption {
                 type = lib.types.port;
+                default = cfg.workers.mainReplicationPort;
                 description = "The replication listeners port on the main synapse process";
               };
               options.worker_listeners = lib.mkOption {
@@ -145,6 +177,7 @@ in
         };
       };
     };
+    };
 
     settings = lib.mkOption {
       type = lib.types.submodule {
@@ -179,7 +212,7 @@ in
 
         options.use_presence = lib.mkOption {
           type = lib.types.bool;
-          description = "disable presence tracking on this homeserver, if you're having perfomance issues this can have a big impact";
+          description = "disable presence tracking, if you're having perfomance issues this can have a big impact";
           default = true;
         };
 
@@ -407,11 +440,16 @@ in
           Restart = "on-failure";
         };
       };
+
+      services.matrix-synapse-next.settings.federation_sender_instances = lib.genList (x: "auto-fed-sender${toString x}") cfg.workers.federationSenders;
+      services.matrix-synapse-next.workers.instances = lib.attrsets.genAttrs (lib.genList
+        (x: "auto-fed-sender${toString x}") cfg.workers.federationSenders)
+        (_: { settings.worker_app = "synapse.app.federation_sender";});
     })
 
     ({
       systemd.services = let
-        workerList = lib.mapAttrsToList (name: value: lib.nameValuePair name value ) cfg.workers;
+        workerList = lib.mapAttrsToList (name: value: lib.nameValuePair name value ) cfg.workers.instances;
         workerName = worker: worker.name;
         workerSettings = worker: (worker.value.settings // {worker_name = (workerName worker);});
         workerConfig = worker: format.generate "matrix-synapse-worker-${workerName worker}-config.yaml" (workerSettings worker);