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Copy pathsqlite.go
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186 lines (171 loc) · 4.27 KB
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package sqlite
import (
"context"
"database/sql"
"fmt"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"sync/atomic"
sqlite3 "github.com/mattn/go-sqlite3"
"github.com/sqliteai/sqlite-memory/cli/internal/config"
"github.com/sqliteai/sqlite-memory/cli/internal/download"
)
var driverSeq atomic.Uint64
type ExtensionPaths struct {
Vector string
Memory string
Sync string
}
type OpenOptions struct {
Config config.Config
ConfigPath string
ExtensionsDir string
SkipLoad bool
}
func Open(ctx context.Context, opts OpenOptions) (*sql.DB, error) {
dbPath := config.DatabasePath(opts.ConfigPath, opts.Config)
if err := os.MkdirAll(filepath.Dir(dbPath), 0755); err != nil {
return nil, err
}
driverName := "sqlite3"
if !opts.SkipLoad {
paths, err := ResolveExtensions(opts.Config, opts.ExtensionsDir)
if err != nil {
return nil, err
}
driverName = registerExtensionDriver(paths)
}
db, err := sql.Open(driverName, dbPath)
if err != nil {
return nil, err
}
db.SetMaxOpenConns(1)
if err := db.PingContext(ctx); err != nil {
db.Close()
return nil, err
}
return db, nil
}
func ResolveExtensions(cfg config.Config, dirOverride string) (ExtensionPaths, error) {
base := config.ResolveExtensionsDir(cfg, dirOverride)
vector, err := resolveOne(base, download.RepoVector, "vector", cfg)
if err != nil {
return ExtensionPaths{}, err
}
memory, err := resolveOne(base, download.RepoMemory, "memory", cfg)
if err != nil {
return ExtensionPaths{}, err
}
var syncPath string
if cfg.Extensions["sync"] != "" {
syncPath, err = resolveOne(base, download.RepoSync, "sync", cfg)
if err != nil {
return ExtensionPaths{}, err
}
}
return ExtensionPaths{Vector: vector, Memory: memory, Sync: syncPath}, nil
}
func LoadExtensions(ctx context.Context, db *sql.DB, paths ExtensionPaths) error {
return fmt.Errorf("extensions must be loaded while opening the database")
}
func registerExtensionDriver(paths ExtensionPaths) string {
name := fmt.Sprintf("sqlite3_sqlmem_%d", driverSeq.Add(1))
sql.Register(name, &sqlite3.SQLiteDriver{Extensions: extensionOrder(paths)})
return name
}
func extensionOrder(paths ExtensionPaths) []string {
order := []string{paths.Vector, paths.Memory}
if paths.Sync != "" {
order = append(order, paths.Sync)
}
return order
}
func resolveOne(base, repo, key string, cfg config.Config) (string, error) {
if v := cfg.Extensions[key]; v != "" && v != "latest" {
if filepath.IsAbs(v) || fileExists(v) {
return v, nil
}
}
version := cfg.ExtensionVersions[key]
if version == "" {
version = cfg.Extensions[key]
}
if version == "" {
version = "latest"
}
lib, ok := download.FindSharedLibrary(filepath.Join(base, repo, version), repo, download.CurrentPlatform())
if !ok && version == "latest" {
lib, ok = findAnyInstalled(base, repo)
}
if !ok {
return "", fmt.Errorf("%s extension not installed. Run `sqlmem extensions install %s`.", key, key)
}
return lib, nil
}
func findAnyInstalled(base, repo string) (string, bool) {
root := filepath.Join(base, repo)
entries, err := os.ReadDir(root)
if err != nil {
return "", false
}
sort.Slice(entries, func(i, j int) bool {
return compareVersions(entries[i].Name(), entries[j].Name()) > 0
})
for _, entry := range entries {
if !entry.IsDir() {
continue
}
if lib, ok := download.FindSharedLibrary(filepath.Join(root, entry.Name()), repo, download.CurrentPlatform()); ok {
return lib, true
}
}
return "", false
}
func compareVersions(a, b string) int {
an := versionNumbers(a)
bn := versionNumbers(b)
if len(an) == 0 || len(bn) == 0 {
return strings.Compare(a, b)
}
for i := 0; i < len(an) || i < len(bn); i++ {
av, bv := 0, 0
if i < len(an) {
av = an[i]
}
if i < len(bn) {
bv = bn[i]
}
if av < bv {
return -1
}
if av > bv {
return 1
}
}
return strings.Compare(a, b)
}
func versionNumbers(version string) []int {
version = strings.TrimLeft(version, "vV")
parts := strings.FieldsFunc(version, func(r rune) bool {
return r < '0' || r > '9'
})
nums := make([]int, 0, len(parts))
for _, part := range parts {
if part == "" {
continue
}
n, err := strconv.Atoi(part)
if err != nil {
return nil
}
nums = append(nums, n)
}
return nums
}
func fileExists(path string) bool {
_, err := os.Stat(path)
return err == nil
}