From 1a6aa73e484ac2e9dc1c9249339948e7a5c0b65f Mon Sep 17 00:00:00 2001
From: vikingowl <christian@nachtigall.dev>
Date: Fri, 3 Apr 2026 12:30:29 +0200
Subject: [PATCH] feat: serve and tui commands with systemd units

---
 cmd/serve.go                  | 119 ++++++++++++++++++++++++++++++++++
 cmd/tui.go                    |  42 ++++++++++++
 systemd/reddit-reader.service |  12 ++++
 systemd/reddit-reader.socket  |   8 +++
 4 files changed, 181 insertions(+)
 create mode 100644 cmd/serve.go
 create mode 100644 cmd/tui.go
 create mode 100644 systemd/reddit-reader.service
 create mode 100644 systemd/reddit-reader.socket

diff --git a/cmd/serve.go b/cmd/serve.go
new file mode 100644
index 0000000..c429cfb
--- /dev/null
+++ b/cmd/serve.go
@@ -0,0 +1,119 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"net"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"github.com/spf13/cobra"
+	"google.golang.org/grpc"
+
+	"somegit.dev/vikingowl/reddit-reader/internal/config"
+	"somegit.dev/vikingowl/reddit-reader/internal/domain"
+	grpcserver "somegit.dev/vikingowl/reddit-reader/internal/grpc/server"
+	"somegit.dev/vikingowl/reddit-reader/internal/llm"
+	"somegit.dev/vikingowl/reddit-reader/internal/monitor"
+	redditpkg "somegit.dev/vikingowl/reddit-reader/internal/reddit"
+	"somegit.dev/vikingowl/reddit-reader/internal/store"
+)
+
+var serveCmd = &cobra.Command{
+	Use:   "serve",
+	Short: "Start the monitor daemon and gRPC server",
+	RunE:  runServe,
+}
+
+func init() {
+	rootCmd.AddCommand(serveCmd)
+}
+
+func runServe(_ *cobra.Command, _ []string) error {
+	cfg, err := config.LoadFromFile(config.DefaultPath())
+	if err != nil {
+		return fmt.Errorf("load config (run 'reddit-reader setup' first): %w", err)
+	}
+	cfg.ApplyEnvOverrides()
+
+	configDir, err := os.UserConfigDir()
+	if err != nil {
+		return fmt.Errorf("resolve config dir: %w", err)
+	}
+	dbPath := filepath.Join(configDir, "reddit-reader", "reddit-reader.db")
+
+	st, err := store.Open(dbPath)
+	if err != nil {
+		return fmt.Errorf("open store: %w", err)
+	}
+
+	redditClient, err := redditpkg.NewClient(
+		cfg.Reddit.ClientID,
+		cfg.Reddit.ClientSecret,
+		cfg.Reddit.Username,
+		cfg.Reddit.Password,
+	)
+	if err != nil {
+		return fmt.Errorf("create reddit client: %w", err)
+	}
+
+	var llmClient llm.Summarizer
+	if cfg.LLM.Backend == "mistral" {
+		llmClient = llm.NewMistralClient(cfg.LLM.APIKey, cfg.LLM.Model)
+	} else {
+		llmClient = llm.NewOpenAIClient(cfg.LLM.Endpoint, cfg.LLM.Model)
+	}
+
+	socketPath := cfg.GRPC.Socket
+	if socketPath == "" {
+		socketPath = config.DefaultSocket()
+	}
+
+	lis, err := net.Listen("unix", socketPath)
+	if err != nil {
+		return fmt.Errorf("listen on socket %s: %w", socketPath, err)
+	}
+
+	grpcSrv := grpc.NewServer()
+	srv := grpcserver.Register(grpcSrv, st, time.Now())
+
+	go func() {
+		slog.Info("gRPC server listening", "socket", socketPath)
+		if serveErr := grpcSrv.Serve(lis); serveErr != nil {
+			slog.Error("gRPC serve error", "err", serveErr)
+		}
+	}()
+
+	monitorCfg := monitor.Config{
+		PollInterval:       cfg.Monitor.PollInterval.Duration,
+		RelevanceThreshold: cfg.LLM.RelevanceThreshold,
+		MaxPostsPerPoll:    cfg.Monitor.MaxPostsPerPoll,
+		Interests: domain.Interests{
+			Description: cfg.Interests.Description,
+		},
+	}
+
+	mon := monitor.New(st, redditClient, llmClient, monitorCfg)
+
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	slog.Info("monitor starting")
+	runErr := mon.Run(ctx, func(posts []domain.Post) {
+		srv.Notify(posts)
+	})
+
+	grpcSrv.GracefulStop()
+	if removeErr := os.Remove(socketPath); removeErr != nil && !os.IsNotExist(removeErr) {
+		slog.Warn("failed to remove socket", "path", socketPath, "err", removeErr)
+	}
+
+	if runErr != nil && runErr != context.Canceled {
+		return runErr
+	}
+	return nil
+}
diff --git a/cmd/tui.go b/cmd/tui.go
new file mode 100644
index 0000000..8843ff9
--- /dev/null
+++ b/cmd/tui.go
@@ -0,0 +1,42 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"somegit.dev/vikingowl/reddit-reader/internal/config"
+	grpcclient "somegit.dev/vikingowl/reddit-reader/internal/grpc/client"
+	"somegit.dev/vikingowl/reddit-reader/internal/tui"
+)
+
+var tuiCmd = &cobra.Command{
+	Use:   "tui",
+	Short: "Connect to the daemon and launch the interactive interface",
+	RunE:  runTUI,
+}
+
+func init() {
+	rootCmd.AddCommand(tuiCmd)
+}
+
+func runTUI(_ *cobra.Command, _ []string) error {
+	cfg, err := config.LoadFromFile(config.DefaultPath())
+	if err != nil {
+		return fmt.Errorf("load config (run 'reddit-reader setup' first): %w", err)
+	}
+	cfg.ApplyEnvOverrides()
+
+	socketPath := cfg.GRPC.Socket
+	if socketPath == "" {
+		socketPath = config.DefaultSocket()
+	}
+
+	client, err := grpcclient.Dial(socketPath)
+	if err != nil {
+		return fmt.Errorf("connect to daemon (is 'reddit-reader serve' running?): %w", err)
+	}
+	defer client.Close()
+
+	return tui.Run(client)
+}
diff --git a/systemd/reddit-reader.service b/systemd/reddit-reader.service
new file mode 100644
index 0000000..1bca919
--- /dev/null
+++ b/systemd/reddit-reader.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=Reddit Reader Monitor
+After=network-online.target
+
+[Service]
+Type=simple
+ExecStart=%h/.local/bin/reddit-reader serve
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=default.target
diff --git a/systemd/reddit-reader.socket b/systemd/reddit-reader.socket
new file mode 100644
index 0000000..45c8bf3
--- /dev/null
+++ b/systemd/reddit-reader.socket
@@ -0,0 +1,8 @@
+[Unit]
+Description=Reddit Reader Socket
+
+[Socket]
+ListenStream=%t/reddit-reader.sock
+
+[Install]
+WantedBy=sockets.target