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|
package storage
import (
"bufio"
"context"
"database/sql"
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
_ "modernc.org/sqlite"
)
const schemaSQL = `
CREATE TABLE IF NOT EXISTS record (
host TEXT NOT NULL,
uptime_sec INTEGER NOT NULL,
boot_time INTEGER NOT NULL,
os TEXT NOT NULL,
os_kernel_name TEXT NOT NULL,
os_kernel_major TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_record_host ON record(host);
CREATE INDEX IF NOT EXISTS idx_record_os ON record(os);
CREATE INDEX IF NOT EXISTS idx_record_os_kernel_name ON record(os_kernel_name);
CREATE INDEX IF NOT EXISTS idx_record_os_kernel_major ON record(os_kernel_major);
`
type Record struct {
Host string
Uptime uint64
BootTime uint64
OS string
KernelName string
KernelMajor string
}
func Open(ctx context.Context, path string) (*sql.DB, error) {
db, err := sql.Open("sqlite", path)
if err != nil {
return nil, err
}
if _, err := db.ExecContext(ctx, "PRAGMA foreign_keys = OFF"); err != nil {
db.Close()
return nil, err
}
return db, nil
}
func CreateSchema(ctx context.Context, db *sql.DB) error {
_, err := db.ExecContext(ctx, schemaSQL)
return err
}
func ResetRecords(ctx context.Context, db *sql.DB) error {
_, err := db.ExecContext(ctx, "DELETE FROM record")
return err
}
func ImportFromDir(ctx context.Context, db *sql.DB, statsDir string) error {
if err := ResetRecords(ctx, db); err != nil {
return fmt.Errorf("reset records: %w", err)
}
entries, err := os.ReadDir(statsDir)
if err != nil {
return fmt.Errorf("read dir: %w", err)
}
tx, err := db.BeginTx(ctx, nil)
if err != nil {
return fmt.Errorf("begin transaction: %w", err)
}
defer tx.Rollback()
insert, err := tx.PrepareContext(ctx, "INSERT INTO record (host, uptime_sec, boot_time, os, os_kernel_name, os_kernel_major) VALUES (?, ?, ?, ?, ?, ?)")
if err != nil {
return fmt.Errorf("prepare insert: %w", err)
}
defer insert.Close()
for _, e := range entries {
if e.IsDir() || !strings.HasSuffix(e.Name(), ".records") {
continue
}
path := filepath.Join(statsDir, e.Name())
info, err := os.Stat(path)
if err != nil || info.Size() == 0 {
continue
}
host := strings.TrimSuffix(e.Name(), filepath.Ext(e.Name()))
if idx := strings.Index(host, "."); idx > 0 {
host = host[:idx]
}
if err := importFile(ctx, insert, path, host); err != nil {
return err
}
}
if err := tx.Commit(); err != nil {
return fmt.Errorf("commit transaction: %w", err)
}
return nil
}
func LoadRecords(ctx context.Context, db *sql.DB) ([]Record, error) {
rows, err := db.QueryContext(ctx, "SELECT host, uptime_sec, boot_time, os, os_kernel_name, os_kernel_major FROM record ORDER BY host, boot_time")
if err != nil {
return nil, fmt.Errorf("query: %w", err)
}
defer rows.Close()
var out []Record
for rows.Next() {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
var rec Record
var uptimeSec, bootTime int64
if err := rows.Scan(&rec.Host, &uptimeSec, &bootTime, &rec.OS, &rec.KernelName, &rec.KernelMajor); err != nil {
return nil, fmt.Errorf("scan row: %w", err)
}
rec.Uptime = uint64(uptimeSec)
rec.BootTime = uint64(bootTime)
out = append(out, rec)
}
if err := rows.Err(); err != nil {
return nil, fmt.Errorf("rows: %w", err)
}
return out, nil
}
type recordLine struct {
Uptime uint64
BootTime uint64
OS string
KernelName string
KernelMajor string
}
func importFile(ctx context.Context, insert *sql.Stmt, path, host string) error {
f, err := os.Open(path)
if err != nil {
return fmt.Errorf("open %s: %w", path, err)
}
defer f.Close()
sc := bufio.NewScanner(f)
for sc.Scan() {
select {
case <-ctx.Done():
return ctx.Err()
default:
}
rec, ok := parseRecordLine(sc.Text())
if !ok {
continue
}
if _, err := insert.ExecContext(ctx, host, rec.Uptime, rec.BootTime, rec.OS, rec.KernelName, rec.KernelMajor); err != nil {
return fmt.Errorf("insert: %w", err)
}
}
if err := sc.Err(); err != nil {
return fmt.Errorf("scan %s: %w", path, err)
}
return nil
}
func parseRecordLine(line string) (recordLine, bool) {
line = strings.TrimSpace(line)
if line == "" {
return recordLine{}, false
}
parts := strings.SplitN(line, ":", 3)
if len(parts) != 3 {
return recordLine{}, false
}
uptime, _ := strconv.ParseUint(parts[0], 10, 64)
bootTime, _ := strconv.ParseUint(parts[1], 10, 64)
osStr := parts[2]
kernelName := osStr
if i := strings.Index(osStr, " "); i > 0 {
kernelName = osStr[:i]
}
kernelMajor := kernelName + " "
rest := osStr
if i := strings.Index(osStr, " "); i >= 0 {
rest = osStr[i+1:]
}
if j := strings.Index(rest, "."); j >= 0 {
kernelMajor += rest[:j] + "..."
} else {
kernelMajor += rest + "..."
}
return recordLine{
Uptime: uptime,
BootTime: bootTime,
OS: osStr,
KernelName: kernelName,
KernelMajor: kernelMajor,
}, true
}
|
