Antigravity Agent
143 lines
4.2 KiB
Markdown
143 lines
4.2 KiB
Markdown
---
|
|
id: wiki-2026-0508-스트림-stream
|
|
title: 스트림(Stream)
|
|
category: 10_Wiki/Topics
|
|
status: verified
|
|
canonical_id: self
|
|
aliases: [stream, streaming]
|
|
duplicate_of: none
|
|
source_trust_level: A
|
|
confidence_score: 0.95
|
|
verification_status: applied
|
|
tags: [stream, async, io]
|
|
raw_sources: []
|
|
last_reinforced: 2026-05-10
|
|
github_commit: pending
|
|
tech_stack:
|
|
language: typescript
|
|
framework: nodejs
|
|
---
|
|
|
|
# 스트림(Stream)
|
|
|
|
## 매 한 줄
|
|
> **"매 데이터를 chunk 단위로 점진 전달한다"**. 매 entire payload 를 buffer 에 fully load 하지 않고, 매 사용 가능한 시점마다 chunk 를 yield → 매 memory footprint 감소 + first-byte latency 개선. 매 modern web (Server-Sent Events · LLM token streaming · HTTP/2 push) 의 backbone.
|
|
|
|
## 매 핵심
|
|
|
|
### 매 Stream 의 종류
|
|
- **Readable**: pull-based source (file read, HTTP response).
|
|
- **Writable**: push-based sink (file write, response.write).
|
|
- **Duplex**: read + write (TCP socket).
|
|
- **Transform**: read → mutate → write (gzip, JSON.parse).
|
|
|
|
### 매 동작 모델
|
|
- **Chunk + backpressure**: consumer slow → producer pause (highWaterMark).
|
|
- **Object mode**: chunk 가 raw bytes 가 아닌 object.
|
|
- **Pipe**: source.pipe(transform).pipe(sink) chain.
|
|
|
|
### 매 응용
|
|
1. LLM token streaming (Claude · GPT-5 의 SSE response).
|
|
2. Large file upload/download (Multipart, S3 multipart).
|
|
3. Real-time analytics (Kafka consumer).
|
|
|
|
## 💻 패턴
|
|
|
|
### Web Streams API (cross-platform)
|
|
```typescript
|
|
const response = await fetch("/api/llm");
|
|
const reader = response.body!.pipeThrough(new TextDecoderStream()).getReader();
|
|
while (true) {
|
|
const { value, done } = await reader.read();
|
|
if (done) break;
|
|
process.stdout.write(value);
|
|
}
|
|
```
|
|
|
|
### Async iteration over Node stream
|
|
```typescript
|
|
import { createReadStream } from "node:fs";
|
|
const stream = createReadStream("big.log", { encoding: "utf-8" });
|
|
for await (const chunk of stream) {
|
|
console.log(`got ${chunk.length} chars`);
|
|
}
|
|
```
|
|
|
|
### Transform stream — gzip on the fly
|
|
```typescript
|
|
import { pipeline } from "node:stream/promises";
|
|
import { createReadStream, createWriteStream } from "node:fs";
|
|
import { createGzip } from "node:zlib";
|
|
await pipeline(createReadStream("input.txt"), createGzip(), createWriteStream("output.gz"));
|
|
```
|
|
|
|
### Server-Sent Events (LLM token stream)
|
|
```typescript
|
|
// Hono / Bun
|
|
import { streamSSE } from "hono/streaming";
|
|
app.get("/chat", c => streamSSE(c, async stream => {
|
|
for await (const tok of llm.generate(prompt)) {
|
|
await stream.writeSSE({ data: tok });
|
|
}
|
|
}));
|
|
```
|
|
|
|
### ReadableStream from generator
|
|
```typescript
|
|
function makeStream<T>(gen: AsyncGenerator<T>) {
|
|
return new ReadableStream<T>({
|
|
async pull(controller) {
|
|
const { value, done } = await gen.next();
|
|
done ? controller.close() : controller.enqueue(value);
|
|
}
|
|
});
|
|
}
|
|
```
|
|
|
|
### Backpressure handling
|
|
```typescript
|
|
const writable = createWriteStream("out.bin");
|
|
function writeChunk(buf: Buffer) {
|
|
if (!writable.write(buf)) {
|
|
return new Promise<void>(res => writable.once("drain", res));
|
|
}
|
|
return Promise.resolve();
|
|
}
|
|
```
|
|
|
|
## 매 결정 기준
|
|
| 상황 | Approach |
|
|
|---|---|
|
|
| Browser fetch streaming | Web Streams API (`response.body`) |
|
|
| Node.js file/network | `node:stream` + async iter |
|
|
| LLM token stream | SSE or chunked transfer |
|
|
| Massive object pipeline | object mode + Transform |
|
|
| Cross-runtime (Bun/Deno) | Web Streams (standard) |
|
|
|
|
**기본값**: Web Streams API + async iteration.
|
|
|
|
## 🔗 Graph
|
|
- 부모: [[Nodejs 성능 최적화 및 디버깅]]
|
|
- Adjacent: [[API 응답 및 에러 핸들링 아키텍처]]
|
|
- 응용: [[Server Architecture]]
|
|
|
|
## 🤖 LLM 활용
|
|
**언제**: streaming chat UI · large file async processing · backpressure debug.
|
|
**언제 X**: small payload (<1MB) — buffering 이 simpler.
|
|
|
|
## ❌ 안티패턴
|
|
- **Concat all chunks before yielding**: stream 의 의미 무효화.
|
|
- **Ignore backpressure**: producer 가 consumer 추월 → memory blow up.
|
|
- **No error propagation in pipe**: 한 stage error 가 silent.
|
|
- **Sync transform on huge object**: event loop block.
|
|
|
|
## 🧪 검증 / 중복
|
|
- Verified (Node.js docs · WHATWG Streams Standard).
|
|
- 신뢰도 A.
|
|
|
|
## 🕓 Changelog
|
|
| 날짜 | 변경 |
|
|
|---|---|
|
|
| 2026-05-08 | Phase 1 |
|
|
| 2026-05-10 | Manual cleanup — Stream API 패턴 정리 |
|