From 125c3947c315e53eb2b712918b997a784f0b91af Mon Sep 17 00:00:00 2001
From: "R. Alex Matevish" <alex@matevi.sh>
Date: Tue, 27 May 2025 20:42:15 -0700
Subject: [PATCH] Move to flat files

---
 go.mod  | 10 ----------
 go.sum  | 14 --------------
 main.go | 60 ++++++++++++++++++++++++++++++---------------------------
 3 files changed, 32 insertions(+), 52 deletions(-)

diff --git a/go.mod b/go.mod
index a9bb465..02ebd02 100644
--- a/go.mod
+++ b/go.mod
@@ -1,13 +1,3 @@
 module github.com/ramatevish/kindle-sender
 
 go 1.24.3
-
-require (
-	github.com/jinzhu/inflection v1.0.0 // indirect
-	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/mattn/go-sqlite3 v1.14.28 // indirect
-	golang.org/x/sys v0.13.0 // indirect
-	golang.org/x/text v0.20.0 // indirect
-	gorm.io/driver/sqlite v1.5.7 // indirect
-	gorm.io/gorm v1.30.0 // indirect
-)
diff --git a/go.sum b/go.sum
index b90bbc7..e69de29 100644
--- a/go.sum
+++ b/go.sum
@@ -1,14 +0,0 @@
-github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
-github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
-github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
-github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
-github.com/mattn/go-sqlite3 v1.14.28 h1:ThEiQrnbtumT+QMknw63Befp/ce/nUPgBPMlRFEum7A=
-github.com/mattn/go-sqlite3 v1.14.28/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
-golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
-golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/text v0.20.0 h1:gK/Kv2otX8gz+wn7Rmb3vT96ZwuoxnQlY+HlJVj7Qug=
-golang.org/x/text v0.20.0/go.mod h1:D4IsuqiFMhST5bX19pQ9ikHC2GsaKyk/oF+pn3ducp4=
-gorm.io/driver/sqlite v1.5.7 h1:8NvsrhP0ifM7LX9G4zPB97NwovUakUxc+2V2uuf3Z1I=
-gorm.io/driver/sqlite v1.5.7/go.mod h1:U+J8craQU6Fzkcvu8oLeAQmi50TkwPEhHDEjQZXDah4=
-gorm.io/gorm v1.30.0 h1:qbT5aPv1UH8gI99OsRlvDToLxW5zR7FzS9acZDOZcgs=
-gorm.io/gorm v1.30.0/go.mod h1:8Z33v652h4//uMA76KjeDH8mJXPm1QNCYrMeatR0DOE=
diff --git a/main.go b/main.go
index 6678868..592e352 100644
--- a/main.go
+++ b/main.go
@@ -5,6 +5,7 @@ import (
 	"crypto/md5"
 	"encoding/base64"
 	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"io"
 	"log"
@@ -14,10 +15,8 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 	"time"
-
-	"gorm.io/driver/sqlite"
-	"gorm.io/gorm"
 )
 
 var (
@@ -28,14 +27,14 @@ var (
 	senderEmail  = os.Getenv("SENDER_EMAIL")
 	recipient    = os.Getenv("RECIPIENT_EMAIL")
 	watchDir     = os.Getenv("WATCH_DIR")
-	db           *gorm.DB
+	sentDir      string
+	sentFileLock sync.Mutex
 )
 
-type SentFile struct {
-	ID     uint      `gorm:"primaryKey"`
-	Path   string
-	Hash   string    `gorm:"uniqueIndex"`
-	SentAt time.Time
+type SentFileEntry struct {
+	Path   string    `json:"path"`
+	SentAt time.Time `json:"sent_at"`
+	Hash   string    `json:"hash"`
 }
 
 func isEbookFile(name string) bool {
@@ -104,33 +103,38 @@ func fileHash(path string) (string, error) {
 	return hex.EncodeToString(h.Sum(nil)), nil
 }
 
+func sentFilePath(hash string) string {
+	return filepath.Join(sentDir, hash+".json")
+}
+
 func hasBeenSent(hash string) bool {
-	var file SentFile
-	err := db.Where("hash = ?", hash).First(&file).Error
+	sentFileLock.Lock()
+	defer sentFileLock.Unlock()
+	_, err := os.Stat(sentFilePath(hash))
 	return err == nil
 }
 
 func markAsSent(filePath, hash string) {
-	err := db.Create(&SentFile{
+	sentFileLock.Lock()
+	defer sentFileLock.Unlock()
+
+	entry := SentFileEntry{
 		Path:   filePath,
-		Hash:   hash,
 		SentAt: time.Now().UTC(),
-	}).Error
-	if err != nil {
-		log.Printf("DB error marking file as sent: %v", err)
+		Hash: hash,
 	}
+	f, err := os.Create(sentFilePath(hash))
+	if err != nil {
+		log.Printf("Failed to record sent file %s: %v", filePath, err)
+		return
+	}
+	defer f.Close()
+	json.NewEncoder(f).Encode(entry)
 }
 
-func setupDatabase() error {
-	dbPath := filepath.Join(watchDir, "sent_files.db")
-	database, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{
-	    SkipDefaultTransaction: true,
-	})
-	if err != nil {
-		return err
-	}
-	db = database
-	return db.AutoMigrate(&SentFile{})
+func setupFileTracking() error {
+	sentDir = filepath.Join(watchDir, ".sent")
+	return os.MkdirAll(sentDir, 0755)
 }
 
 func scanAndSendEbooks() {
@@ -170,8 +174,8 @@ func main() {
 		log.Fatal("WATCH_DIR environment variable is required")
 	}
 
-	if err := setupDatabase(); err != nil {
-		log.Fatalf("Failed to setup database: %v", err)
+	if err := setupFileTracking(); err != nil {
+		log.Fatalf("Failed to setup tracking directory: %v", err)
 	}
 
 	log.Printf("Scanning folder: %s\n", watchDir)