Added: Swagger; Split Services into Units

Merged

.gitignore

@@ -0,0 +1,43 @@
+# Nix build outputs
+result
+result-*
+*.img
+*.img.zst
+*.qcow2
+
+# Nix store
+.dirlocals
+
+# Build artifacts
+*.o
+*.a
+*.so
+*.dylib
+
+# IDE/Editor
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Archives
+*.tar.gz
+*.tar.bz2
+*.zip
+
+# Local development
+.envrc
+direnv.allow
+
+# Flake lock (optional - usually committed, but some prefer not to)
+# flake.lock
+
+# Temporary files
+*.tmp
+*.bak

flake.lock

@@ -1,38 +1,6 @@
 {
   "nodes": {
-    "flake-compat": {
-      "locked": {
-        "lastModified": 1733328505,
-        "narHash": "sha256-NeCCThCEP3eCl2l/+27kNNK7QrwZB1IJCrXfrbv5oqU=",
-        "rev": "ff81ac966bb2cae68946d5ed5fc4994f96d0ffec",
-        "revCount": 69,
-        "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/edolstra/flake-compat/1.1.0/01948eb7-9cba-704f-bbf3-3fa956735b52/source.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz"
-      }
-    },
     "flake-parts": {
-      "inputs": {
-        "nixpkgs-lib": "nixpkgs-lib"
-      },
-      "locked": {
-        "lastModified": 1769996383,
-        "narHash": "sha256-AnYjnFWgS49RlqX7LrC4uA+sCCDBj0Ry/WOJ5XWAsa0=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "57928607ea566b5db3ad13af0e57e921e6b12381",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
-    "flake-parts_2": {
       "inputs": {
         "nixpkgs-lib": [
           "nixvim",
@@ -60,11 +28,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1770818644,
+        "lastModified": 1770995331,
-        "narHash": "sha256-DYS4jIRpRoKOzJjnR/QqEd/MlT4OZZpt8CrBLv+cjsE=",
+        "narHash": "sha256-MZOF7PVKDOMAOp6bJpzuKOb1DVcyUT84568r8y3iVGg=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "0acbd1180697de56724821184ad2c3e6e7202cd7",
+        "rev": "5e90b62996d56da9acb21e502c078e7c4e6ab40f",
         "type": "github"
       },
       "original": {
@@ -74,64 +42,13 @@
         "type": "github"
       }
     },
-    "nixcord": {
-      "inputs": {
-        "flake-compat": "flake-compat",
-        "flake-parts": "flake-parts",
-        "nixpkgs": "nixpkgs"
-      },
-      "locked": {
-        "lastModified": 1770761134,
-        "narHash": "sha256-65Xg7Rfx9Cj/D+OUF7KZUcYSQPbToBDZpqUfFUAKuwc=",
-        "owner": "kaylorben",
-        "repo": "nixcord",
-        "rev": "f77d6e05efd34581cbc30e7f426496285711bcde",
-        "type": "github"
-      },
-      "original": {
-        "owner": "kaylorben",
-        "repo": "nixcord",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1770617025,
+        "lastModified": 1770843696,
-        "narHash": "sha256-1jZvgZoAagZZB6NwGRv2T2ezPy+X6EFDsJm+YSlsvEs=",
+        "narHash": "sha256-LovWTGDwXhkfCOmbgLVA10bvsi/P8eDDpRudgk68HA8=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "2db38e08fdadcc0ce3232f7279bab59a15b94482",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-25.11",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-lib": {
-      "locked": {
-        "lastModified": 1769909678,
-        "narHash": "sha256-cBEymOf4/o3FD5AZnzC3J9hLbiZ+QDT/KDuyHXVJOpM=",
-        "owner": "nix-community",
-        "repo": "nixpkgs.lib",
-        "rev": "72716169fe93074c333e8d0173151350670b824c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "nixpkgs.lib",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1770781623,
-        "narHash": "sha256-RYEMTlGCVc67pxVxjOlGd8w6fpF7Bur7gKL88FB0WTs=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "c05d2232d2feaa4c7a07f1168606917402868195",
+        "rev": "2343bbb58f99267223bc2aac4fc9ea301a155a16",
         "type": "github"
       },
       "original": {
@@ -141,7 +58,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_3": {
+    "nixpkgs_2": {
       "locked": {
         "lastModified": 1770380644,
         "narHash": "sha256-P7dWMHRUWG5m4G+06jDyThXO7kwSk46C1kgjEWcybkE=",
@@ -157,34 +74,18 @@
         "type": "github"
       }
     },
-    "nixpkgs_4": {
-      "locked": {
-        "lastModified": 1770197578,
-        "narHash": "sha256-AYqlWrX09+HvGs8zM6ebZ1pwUqjkfpnv8mewYwAo+iM=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "00c21e4c93d963c50d4c0c89bfa84ed6e0694df2",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "nixvim": {
       "inputs": {
-        "flake-parts": "flake-parts_2",
+        "flake-parts": "flake-parts",
-        "nixpkgs": "nixpkgs_3",
+        "nixpkgs": "nixpkgs_2",
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1770630823,
+        "lastModified": 1770954048,
-        "narHash": "sha256-5SEmOnJ61vmbap39vzWEsCX5UQ+3Ul8J4mXWKdqSn3w=",
+        "narHash": "sha256-TEXS8Z7K+GsOOtL0QD1hrMxL0lVJjKDl3qZq/mJHu2k=",
         "owner": "nix-community",
         "repo": "nixvim",
-        "rev": "6acc964664ac916c64fe4e394edd467af4d90790",
+        "rev": "e49b8deda7b1732f5a2ea2a90446e45adb2a121d",
         "type": "github"
       },
       "original": {
@@ -196,29 +97,8 @@
     "root": {
       "inputs": {
         "home-manager": "home-manager",
-        "nixcord": "nixcord",
+        "nixpkgs": "nixpkgs",
-        "nixpkgs": "nixpkgs_2",
+        "nixvim": "nixvim"
-        "nixvim": "nixvim",
-        "spicetify-nix": "spicetify-nix"
-      }
-    },
-    "spicetify-nix": {
-      "inputs": {
-        "nixpkgs": "nixpkgs_4",
-        "systems": "systems_2"
-      },
-      "locked": {
-        "lastModified": 1770528352,
-        "narHash": "sha256-KO51BALxgLUlhg1CqQgA3Rj8vgAcDvoLxzNLTxD65cc=",
-        "owner": "Gerg-L",
-        "repo": "spicetify-nix",
-        "rev": "9f4ab243968118026f4ff82f7ce41d30319e2bf0",
-        "type": "github"
-      },
-      "original": {
-        "owner": "Gerg-L",
-        "repo": "spicetify-nix",
-        "type": "github"
       }
     },
     "systems": {
@@ -235,21 +115,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -16,33 +16,45 @@
     home-manager.url = "github:nix-community/home-manager/master";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
     nixvim.url = "github:nix-community/nixvim";
-    nixcord.url = "github:kaylorben/nixcord";
-    spicetify-nix.url = "github:Gerg-L/spicetify-nix";
   };
 
-  outputs = { self, nixpkgs, home-manager, nixvim, ... }@inputs:
+  outputs =
+    {
+      self,
+      nixpkgs,
+      home-manager,
+      nixvim,
+      ...
+    }@inputs:
     let
       primaryUser = "phil";
       system = "aarch64-linux";
+
+      mkNixosConfig =
+        hostName:
+        nixpkgs.lib.nixosSystem {
+          inherit system;
+          modules = [
+            ./nixos/default.nix
+            ./nixos/hardware.nix
+            ./hosts/${hostName}/configuration.nix
+            home-manager.nixosModules.home-manager
+            {
+              home-manager = {
+                useGlobalPkgs = true;
+                useUserPackages = true;
+                users.${primaryUser} = import ./home/default.nix;
+                extraSpecialArgs = { inherit inputs primaryUser; };
+                backupFileExtension = "backup";
+              };
+            }
+          ];
+          specialArgs = { inherit inputs self primaryUser; };
+        };
     in
     {
-      nixosConfigurations."rpi-4" = nixpkgs.lib.nixosSystem {
+      nixosConfigurations."cyper-pi-1" = mkNixosConfig "cyper-pi-1";
-        inherit system;
+      nixosConfigurations."cyper-pi-2" = mkNixosConfig "cyper-pi-2";
-        modules = [
-          ./nixos/default.nix
-          ./nixos/hardware.nix
-          home-manager.nixosModules.home-manager
-          {
-            home-manager = {
-	    	useGlobalPkgs = true;
-        	useUserPackages = true;
-            	users.${primaryUser} = import ./home/default.nix;
-            	extraSpecialArgs = { inherit inputs primaryUser; };
-	    	backupFileExtension = "backup";
-	    };
-          }
-        ];
-        specialArgs = { inherit inputs self primaryUser; };
-      };
     };
+
 }

hosts/cyper-pi-1/configuration.nix

@@ -0,0 +1,24 @@
+{
+  lib,
+  ...
+}:
+
+{
+  imports = [
+    ./postgres.nix
+    ./postgrest.nix
+    ./swagger.nix
+    ./k3s-master.nix
+  ];
+
+  # Any RPi 4 specific customizations go here
+  networking = {
+    hostName = lib.mkForce "cyper-pi-1";
+    #    interfaces.end0.ipv4.addresses = [
+    #      {
+    #        address = "192.168.2.41";
+    #        prefixLength = 24;
+    #      }
+    #    ];
+  };
+}

hosts/cyper-pi-1/k3s-master.nix

@@ -0,0 +1,39 @@
+{ pkgs, ... }:
+
+{
+  boot.kernelParams = [
+    "cgroup_memory=1"
+    "cgroup_enable=memory"
+    "cgroup_enable=cpuset"
+  ];
+
+  services.k3s = {
+    enable = true;
+    role = "server";
+    clusterInit = true;
+    extraFlags = ''
+      --disable=traefik
+      --flannel-backend=host-gw
+    '';
+  };
+
+  networking.firewall = {
+    allowedTCPPorts = [ 6443 ];
+    allowedTCPPortRanges = [
+      {
+        from = 10250;
+        to = 10250;
+      }
+      {
+        from = 30000;
+        to = 32767;
+      }
+    ];
+    trustedInterfaces = [ "cni0" ];
+  };
+
+  environment.systemPackages = with pkgs; [
+    kubectl
+    kubernetes-helm
+  ];
+}

hosts/cyper-pi-1/postgres.nix

@@ -0,0 +1,85 @@
+{
+  pkgs,
+  ...
+}:
+
+{
+  services.postgresql = {
+    enable = true;
+    package = pkgs.postgresql_15;
+    enableTCPIP = true;
+
+    # Initial database setup
+    initialScript = pkgs.writeText "backend-init-script" ''
+      CREATE USER postgres WITH SUPERUSER PASSWORD 'postgres';
+
+      -- Create web_anon role for PostgREST
+      CREATE ROLE web_anon NOLOGIN;
+      GRANT USAGE ON SCHEMA public TO web_anon;
+      GRANT SELECT ON ALL TABLES IN SCHEMA public TO web_anon;
+
+      -- Create example users table
+      CREATE TABLE IF NOT EXISTS users (
+        id SERIAL PRIMARY KEY,
+        name VARCHAR(255),
+        email VARCHAR(255),
+        created_at TIMESTAMP DEFAULT NOW()
+      );
+
+      -- Grant permissions
+      GRANT SELECT, INSERT, UPDATE, DELETE ON users TO web_anon;
+      GRANT USAGE, SELECT ON SEQUENCE users_id_seq TO web_anon;
+    '';
+
+    # Raspberry Pi 4 optimized settings (2GB RAM assumed)
+    settings = {
+      # Should match firewall
+      port = 5432;
+
+      # Memory settings (RPi 4 has limited RAM)
+      shared_buffers = "128MB";
+      effective_cache_size = "512MB";
+      maintenance_work_mem = "32MB";
+      work_mem = "2MB";
+      wal_buffers = "4MB";
+
+      # Connection settings
+      max_connections = 20;
+
+      # Performance tuning for ARM/RPi
+      random_page_cost = 2.0;
+      effective_io_concurrency = 100;
+
+      # WAL settings (conservative for SD card)
+      wal_level = "replica";
+      checkpoint_timeout = "15min";
+      checkpoint_completion_target = 0.7;
+      min_wal_size = "1GB";
+      max_wal_size = "4GB";
+
+      # Query planning
+      default_statistics_target = 50;
+
+      # Logging
+      log_min_duration_statement = 1000;
+      log_duration = false;
+
+      # ARM/RPi specific
+      cpu_index_tuple_cost = 0.1;
+      cpu_operator_cost = 0.05;
+    };
+
+    authentication = ''
+      local	all			all								trust
+      host	all			all			127.0.0.1/32		md5
+      host	all			all			::1/128				md5
+      host	all			all			192.168.2.0/24		md5
+    '';
+  };
+
+  # Enable the PostgreSQL service to start on boot
+  systemd.services.postgresql.wantedBy = [ "multi-user.target" ];
+
+  # Open firewall port for PostgreSQL
+  networking.firewall.allowedTCPPorts = [ 5432 ];
+}

hosts/cyper-pi-1/postgrest.nix

@@ -0,0 +1,50 @@
+{
+  pkgs,
+  ...
+}:
+
+{
+  # PostgREST service
+  systemd.services.postgrest = {
+    description = "PostgREST - PostgreSQL REST API";
+    after = [
+      "postgresql.service"
+      "network.target"
+    ];
+    wantedBy = [ "multi-user.target" ];
+
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${pkgs.postgrest}/bin/postgrest /etc/postgrest/postgrest.conf";
+      User = "postgrest";
+      Restart = "on-failure";
+      RestartSec = 5;
+    };
+  };
+
+  # Create postgrest user
+  users.users.postgrest = {
+    isSystemUser = true;
+    group = "postgrest";
+  };
+
+  users.groups.postgrest = { };
+
+  # PostgREST configuration file
+  environment.etc."postgrest/postgrest.conf".text = ''
+    db-uri = "postgres://postgres:postgres@127.0.0.1:5432/postgres"
+    db-schema = "public"
+    db-anon-role = "web_anon"
+    server-host = "0.0.0.0"
+    server-port = 3000
+    jwt-secret = "no7WwM0xJa/Yzn5o4IZHG4oBNSShl4JRPZOcmhvnqFw="
+  '';
+
+  # Open firewall port for PostgREST
+  networking.firewall.allowedTCPPorts = [ 3000 ];
+
+  # Include postgrest in system packages
+  environment.systemPackages = with pkgs; [
+    postgrest
+  ];
+}

hosts/cyper-pi-1/swagger.nix

@@ -0,0 +1,80 @@
+{
+  pkgs,
+  ...
+}:
+
+{
+  # Swagger UI service
+  systemd.services.swagger-ui = {
+    description = "Swagger UI for PostgREST API";
+    after = [ "postgrest.service" "network.target" ];
+    wantedBy = [ "multi-user.target" ];
+
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${pkgs.nodePackages.http-server}/bin/http-server /var/lib/swagger-ui -p 8080 -c-1 --cors";
+      Restart = "on-failure";
+      RestartSec = 5;
+      User = "swagger";
+    };
+  };
+
+  # Create swagger user
+  users.users.swagger = {
+    isSystemUser = true;
+    group = "swagger";
+  };
+
+  users.groups.swagger = {};
+
+  # Setup Swagger UI directory
+  systemd.tmpfiles.rules = [
+    "d /var/lib/swagger-ui 0755 swagger swagger"
+  ];
+
+  # Create Swagger UI index.html that points to PostgREST OpenAPI
+  environment.etc."swagger-ui-init/index.html".text = ''
+    <!DOCTYPE html>
+    <html>
+      <head>
+        <title>Swagger UI - PostgREST API</title>
+        <meta charset="utf-8"/>
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/swagger-ui-dist@3/swagger-ui.css">
+      </head>
+      <body>
+        <div id="swagger-ui"></div>
+        <script src="https://cdn.jsdelivr.net/npm/swagger-ui-dist@3/swagger-ui-bundle.js"></script>
+        <script src="https://cdn.jsdelivr.net/npm/swagger-ui-dist@3/swagger-ui-standalone-preset.js"></script>
+        <script>
+          SwaggerUIBundle({
+            url: "http://localhost:3000/openapi.json",
+            dom_id: '#swagger-ui',
+            presets: [
+              SwaggerUIBundle.presets.apis,
+              SwaggerUIStandalonePreset
+            ],
+            layout: "StandaloneLayout"
+          })
+        </script>
+      </body>
+    </html>
+  '';
+
+  # Copy Swagger UI files on startup
+  system.activationScripts.swagger-ui-setup = ''
+    mkdir -p /var/lib/swagger-ui
+    cp ${pkgs.swagger-ui}/share/swagger-ui/* /var/lib/swagger-ui/ 2>/dev/null || true
+    cp /etc/swagger-ui-init/index.html /var/lib/swagger-ui/index.html
+    chown -R swagger:swagger /var/lib/swagger-ui
+  '';
+
+  # Open firewall port for Swagger UI
+  networking.firewall.allowedTCPPorts = [ 8080 ];
+
+  # Include packages
+  environment.systemPackages = with pkgs; [
+    swagger-ui
+    nodePackages.http-server
+  ];
+}

hosts/cyper-pi-2/configuration.nix

@@ -0,0 +1,19 @@
+{
+  lib,
+  ...
+}:
+
+{
+  imports = [ ../services/k3s-agent.nix ];
+
+  # Any RPi 4 specific customizations go here
+  networking = {
+    hostName = lib.mkForce "cyper-pi-2";
+    #    interfaces.end0.ipv4.addresses = [
+    #      {
+    #        address = "192.168.2.41";
+    #        prefixLength = 24;
+    #      }
+    #    ];
+  };
+}

hosts/rpi-4/configuration.nix

@@ -1,12 +0,0 @@
-{ config, pkgs, primaryUser, ... }:
-
-{
-  # Host-specific packages
-  environment.systemPackages = with pkgs; [
-#    python3
-#    nodejs
-  ];
-
-  # Any RPi 4 specific customizations go here
-  networking.hostName = "rpi-4";
-}

hosts/services/k3s-agent.nix

@@ -0,0 +1,29 @@
+{ ... }:
+
+{
+  boot.kernelParams = [
+    "cgroup_memory=1"
+    "cgroup_enable=memory"
+    "cgroup_enable=cpuset"
+  ];
+
+  services.k3s = {
+    enable = true;
+    role = "agent";
+    serverAddr = "https://192.168.2.200:6443";
+  };
+
+  networking.firewall = {
+    allowedTCPPortRanges = [
+      {
+        from = 10250;
+        to = 10250;
+      }
+      {
+        from = 30000;
+        to = 32767;
+      }
+    ];
+    trustedInterfaces = [ "cni0" ];
+  };
+}

nixos/default.nix

@@ -1,8 +1,5 @@
 {
-  config,
   pkgs,
-  inputs,
-  self,
   primaryUser,
   ...
 }:
@@ -16,6 +13,18 @@
 
   nixpkgs.config.allowUnfree = true;
 
+  # Speeding up builds
+  documentation = {
+    enable = false;
+    man = {
+      enable = false;
+      generateCaches = false;
+    };
+    doc.enable = false;
+    info.enable = false;
+    nixos.enable = false;
+  };
+
   # Override python-lsp-server to skip tests (flaky tests cause timeout)
   nixpkgs.config.packageOverrides = pkgs: {
     python3 = pkgs.python3.override {
@@ -28,8 +37,23 @@
   };
 
   networking = {
-    hostName = "rpi-4";
+    hostName = "cyper-pi";
-    networkmanager.enable = true;
+    useDHCP = true;
+    networkmanager.enable = false;
+    enableIPv6 = false;
+    wireless = {
+      enable = true;
+      networks = {
+        LANFRED = {
+          pskRaw = "36e2b41b51328800a9582be1a05f13f796f943569610ccdb61304803b86ce3da";
+        };
+      };
+    };
+
+    firewall = {
+      enable = true;
+      allowPing = true;
+    };
   };
 
   # SSH configuration
@@ -44,11 +68,15 @@
     isNormalUser = true;
     home = "/home/${primaryUser}";
     description = "Phil";
+    hashedPassword = "$6$TqAclAMz/DFP90Ve$HEN4t1pqK36rACeWctJOmLArkTWb/rIBYamu4sY8bPuDnqkVVyfOLqXKkgX8zBf9LKz02.mo4EKFRnYWIzcAX1";
     extraGroups = [
       "wheel"
-      "networkmanager"
     ];
     shell = pkgs.fish;
+    openssh.authorizedKeys.keys = [
+      "ssh-rsa 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 phil@web.cyperpunk.de"
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEuYuGhqRC/QLoRBH91c3DG5JHlAdRLQsvde18k5ipY2 phil@cyperpunk.de"
+    ];
   };
 
   # Shell