Restructure go project (#2356)

* Move main to cmd
* Move api to internal
* Move logger and manager to internal
* Move shell hiding code to separate package
* Decouple job from desktop and utils
* Decouple session from config
* Move static into internal
* Decouple config from dlna
* Move desktop to internal
* Move dlna to internal
* Decouple remaining packages from config
* Move config into internal
* Move jsonschema and paths to models
* Make ffmpeg functions private
* Move file utility methods into fsutil package
* Move symwalk into fsutil
* Move single-use util functions into client package
* Move slice functions to separate packages
* Add env var to suppress windowsgui arg
* Move hash functions into separate package
* Move identify to internal
* Move autotag to internal
* Touch UI when generating backend

internal/manager/checksum.go

@@ -0,0 +1,73 @@
+package manager
+
+import (
+	"context"
+	"errors"
+
+	"github.com/stashapp/stash/internal/manager/config"
+	"github.com/stashapp/stash/pkg/logger"
+	"github.com/stashapp/stash/pkg/models"
+)
+
+func setInitialMD5Config(ctx context.Context, txnManager models.TransactionManager) {
+	// if there are no scene files in the database, then default the
+	// VideoFileNamingAlgorithm config setting to oshash and calculateMD5 to
+	// false, otherwise set them to true for backwards compatibility purposes
+	var count int
+	if err := txnManager.WithReadTxn(ctx, func(r models.ReaderRepository) error {
+		var err error
+		count, err = r.Scene().Count()
+		return err
+	}); err != nil {
+		logger.Errorf("Error while counting scenes: %s", err.Error())
+		return
+	}
+
+	usingMD5 := count != 0
+	defaultAlgorithm := models.HashAlgorithmOshash
+	if usingMD5 {
+		defaultAlgorithm = models.HashAlgorithmMd5
+	}
+
+	config := config.GetInstance()
+	config.SetChecksumDefaultValues(defaultAlgorithm, usingMD5)
+	if err := config.Write(); err != nil {
+		logger.Errorf("Error while writing configuration file: %s", err.Error())
+	}
+}
+
+// ValidateVideoFileNamingAlgorithm validates changing the
+// VideoFileNamingAlgorithm configuration flag.
+//
+// If setting VideoFileNamingAlgorithm to MD5, then this function will ensure
+// that all checksum values are set on all scenes.
+//
+// Likewise, if VideoFileNamingAlgorithm is set to oshash, then this function
+// will ensure that all oshash values are set on all scenes.
+func ValidateVideoFileNamingAlgorithm(txnManager models.TransactionManager, newValue models.HashAlgorithm) error {
+	// if algorithm is being set to MD5, then all checksums must be present
+	return txnManager.WithReadTxn(context.TODO(), func(r models.ReaderRepository) error {
+		qb := r.Scene()
+		if newValue == models.HashAlgorithmMd5 {
+			missingMD5, err := qb.CountMissingChecksum()
+			if err != nil {
+				return err
+			}
+
+			if missingMD5 > 0 {
+				return errors.New("some checksums are missing on scenes. Run Scan with calculateMD5 set to true")
+			}
+		} else if newValue == models.HashAlgorithmOshash {
+			missingOSHash, err := qb.CountMissingOSHash()
+			if err != nil {
+				return err
+			}
+
+			if missingOSHash > 0 {
+				return errors.New("some oshash values are missing on scenes. Run Scan to populate")
+			}
+		}
+
+		return nil
+	})
+}