sati-open/sati.n-api.index-file
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Read writer memory optimize

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This commit is contained in:
Eli-Class
2026-02-05 05:36:36 +00:00
parent 132189da48
commit 92a2681292
8 changed files with 118 additions and 87 deletions
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21
lib/idx/reader.ts
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@@ -1,5 +1,6 @@
// src/index-file/reader.ts
import * as fs from 'node:fs';
import * as fsext from 'fs-ext';
import { INDEX_HEADER_SIZE, INDEX_ENTRY_SIZE, FLAG_VALID } from './constants.js';
import { IndexProtocol } from './protocol.js';
import type { IndexHeader, IndexEntry } from './types.js';
@@ -14,7 +15,8 @@ export class IndexReader {
private currentIndex: number = -1;
private currentSequence: number = -1;
// Reusable buffer for reading entries
// Reusable buffers
private headerBuf: Buffer = Buffer.alloc(INDEX_HEADER_SIZE);
private entryBuffer: Buffer = Buffer.alloc(INDEX_ENTRY_SIZE);
constructor() {
@@ -22,12 +24,16 @@ export class IndexReader {
open(idxFilePath: string): void {
this.path = idxFilePath;
// 버퍼 초기화
this.headerBuf.fill(0);
this.entryBuffer.fill(0);
this.fd = fs.openSync(this.path, 'r');
// Read header only (64 bytes)
const headerBuf = Buffer.alloc(INDEX_HEADER_SIZE);
fs.readSync(this.fd, headerBuf, 0, INDEX_HEADER_SIZE, 0);
this.header = IndexProtocol.readHeader(headerBuf);
fs.readSync(this.fd, this.headerBuf, 0, INDEX_HEADER_SIZE, null);
this.header = IndexProtocol.readHeader(this.headerBuf);
// 아예 최초에는 -1 로 두어서 readNextEntry 할때 자동 ++ 할때 오류를 검증
this.currentIndex = -1;
this.currentSequence = -1;
@@ -136,6 +142,10 @@ export class IndexReader {
this.header = null;
this.currentIndex = -1;
this.currentSequence = -1;
// 버퍼 초기화
this.headerBuf.fill(0);
this.entryBuffer.fill(0);
}
// ######################################################################
@@ -143,7 +153,8 @@ export class IndexReader {
// ######################################################################
private readEntryAt(fd: number, index: number): IndexEntry | null {
const offset = INDEX_HEADER_SIZE + index * INDEX_ENTRY_SIZE;
fs.readSync(fd, this.entryBuffer, 0, INDEX_ENTRY_SIZE, offset);
fsext.seekSync(fd, offset, 0);
fs.readSync(fd, this.entryBuffer, 0, INDEX_ENTRY_SIZE, null);
const flags = this.entryBuffer.readUInt32LE(24);
const indexEntry = this.buildIndexEntry(flags);