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package main
import (
"context"
"errors"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"time"
badger "github.com/dgraph-io/badger/v4"
"github.com/dgraph-io/badger/v4/options"
"github.com/urfave/cli/v2"
)
func getLocalStorage() string {
switch runtime.GOOS {
case "windows":
return os.Getenv("APPDATA")
case "linux":
home, _ := os.UserHomeDir()
return filepath.Join(home, ".local", "share")
case "darwin":
home, _ := os.UserHomeDir()
return filepath.Join(home, "Library", "Application Support")
default:
return ""
}
}
func getDb(cCtx *cli.Context) (context.Context, error) {
if cCtx.Path("dbfile") == "" {
localFolder := getLocalStorage()
if localFolder == "" {
return context.WithValue(cCtx.Context, "dbfile", ""), errors.New("failed to locate application data folder")
}
return context.WithValue(cCtx.Context, "dbfile", filepath.Join(localFolder, "reencoder")), nil
}
if _, err := os.Stat(cCtx.Path("dbfile")); err != nil {
return context.WithValue(cCtx.Context, "dbfile", ""), err
}
return context.WithValue(cCtx.Context, "dbfile", cCtx.Path("dbfile")), nil
}
func checkTools() error {
if _, err := exec.LookPath("flac"); err != nil {
return errors.New("missing flac executable")
}
if _, err := exec.LookPath("metaflac"); err != nil {
return errors.New("missing metaflac executable")
}
return nil
}
func initArgs(cCtx *cli.Context) (context.Context, error) {
if err := checkTools(); err != nil {
return nil, err
}
if _, err := os.Stat(cCtx.Path("path")); err != nil {
return nil, err
}
ctx, err := getDb(cCtx)
if err != nil {
return nil, err
}
ctx = context.WithValue(ctx, "path", cCtx.Path("path"))
encoder, err := exec.Command("flac", "-v").Output()
if err != nil {
return nil, err
}
return context.WithValue(ctx, "encoder", strings.ReplaceAll(strings.Split(string(encoder), " ")[1], "\n", "")), nil
}
func Options(path string) badger.Options {
return badger.Options{
Dir: path,
ValueDir: path,
MemTableSize: 64 << 20,
BaseTableSize: 2 << 20,
BaseLevelSize: 10 << 20,
TableSizeMultiplier: 2,
LevelSizeMultiplier: 10,
MaxLevels: 7,
NumGoroutines: 8,
MetricsEnabled: false,
NumCompactors: 4, // Run at least 2 compactors. Zero-th compactor prioritizes L0.
NumLevelZeroTables: 5,
NumLevelZeroTablesStall: 15,
NumMemtables: 5,
BloomFalsePositive: 0.01,
BlockSize: 4 * 1024,
SyncWrites: false,
NumVersionsToKeep: 1,
CompactL0OnClose: true,
VerifyValueChecksum: false,
Compression: options.Snappy,
BlockCacheSize: 256 << 20,
IndexCacheSize: 0,
// The following benchmarks were done on a 4 KB block size (default block size). The
// compression is ratio supposed to increase with increasing compression level but since the
// input for compression algorithm is small (4 KB), we don't get significant benefit at
// level 3.
// NOTE: The benchmarks are with DataDog ZSTD that requires CGO. Hence, no longer valid.
// no_compression-16 10 502848865 ns/op 165.46 MB/s -
// zstd_compression/level_1-16 7 739037966 ns/op 112.58 MB/s 2.93
// zstd_compression/level_3-16 7 756950250 ns/op 109.91 MB/s 2.72
// zstd_compression/level_15-16 1 11135686219 ns/op 7.47 MB/s 4.38
// Benchmark code can be found in table/builder_test.go file
ZSTDCompressionLevel: 1,
// (2^30 - 1)*2 when mmapping < 2^31 - 1, max int32.
// -1 so 2*ValueLogFileSize won't overflow on 32-bit systems.
ValueLogFileSize: 1<<30 - 1,
ValueLogMaxEntries: 1000000,
VLogPercentile: 0.0,
ValueThreshold: (1 << 20),
Logger: nil,
EncryptionKey: []byte{},
EncryptionKeyRotationDuration: 10 * 24 * time.Hour, // Default 10 days.
DetectConflicts: true,
NamespaceOffset: -1,
}
}
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