Ruben Hensen
80 lines
2.3 KiB
Nix
80 lines
2.3 KiB
Nix
{ config, lib, pkgs, self, ... }:
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let
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cfg = config.eink.renderer;
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pythonEnv = pkgs.python3.withPackages (ps: with ps; [
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pillow
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numpy
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playwright
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requests
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# The Waveshare 12.48" lib is not packaged in nixpkgs; we vendor it
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# under renderer/waveshare/ and import it as a local module.
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spidev
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rpi-gpio
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]);
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in
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{
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options.eink.renderer = {
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enable = lib.mkEnableOption "E-paper renderer (Playwright + Pillow + Waveshare driver)";
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dashboardUrl = lib.mkOption {
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type = lib.types.str;
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default = "http://127.0.0.1:3000";
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};
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refreshSeconds = lib.mkOption {
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type = lib.types.int;
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default = 300;
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description = "Seconds between full panel refreshes. Below 180 will wear the panel.";
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};
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panel = lib.mkOption {
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type = lib.types.enum [ "bw" "bwr" ];
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default = "bw";
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description = "Panel variant: bw = 12.48\" B/W, bwr = 12.48\" Module (B) B/W/Red.";
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};
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};
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config = lib.mkIf cfg.enable {
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# Playwright needs a Chromium and its system deps. Use the nixpkgs one
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# so the binary path is stable across rebuilds (not the npm-downloaded
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# browser, which won't find its sandbox libs on NixOS).
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systemd.services.eink-renderer = {
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description = "E-paper renderer loop";
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after = [ "eink-dashboard.service" "network-online.target" ];
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wants = [ "eink-dashboard.service" ];
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wantedBy = [ "multi-user.target" ];
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environment = {
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DASHBOARD_URL = cfg.dashboardUrl;
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REFRESH_SECONDS = toString cfg.refreshSeconds;
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PANEL_VARIANT = cfg.panel;
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PLAYWRIGHT_BROWSERS_PATH = "${pkgs.playwright-driver.browsers}";
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PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD = "1";
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PYTHONPATH = "${self}/renderer";
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};
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serviceConfig = {
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Type = "simple";
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ExecStart = "${pythonEnv}/bin/python ${self}/renderer/render.py";
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Restart = "always";
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RestartSec = "10s";
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# The Waveshare lib needs raw SPI + GPIO. Run as a dedicated user
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# in the spi/gpio groups rather than root.
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User = "eink";
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Group = "eink";
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SupplementaryGroups = [ "spi" "gpio" ];
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};
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};
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users.users.eink = {
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isSystemUser = true;
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group = "eink";
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extraGroups = [ "spi" "gpio" ];
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};
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users.groups.eink = {};
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};
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}
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