| 1 | /** |
| 2 | * Bun implementation of the Effect HTTP platform service. |
| 3 | * |
| 4 | * This module provides one `layer` for `HttpPlatform`. It implements file |
| 5 | * responses with `Bun.file`, supports sliced file responses for byte ranges, |
| 6 | * and returns Web `File` values as raw HTTP server responses. The layer also |
| 7 | * provides the Bun file-system layer and ETag generator required by |
| 8 | * `HttpPlatform`. |
| 9 | * |
| 10 | * @since 4.0.0 |
| 11 | */ |
| 12 | import * as NodeHttpCompression from "@effect/platform-node-shared/NodeHttpCompression" |
| 13 | import type * as Effect from "effect/Effect" |
| 14 | import type { FileSystem } from "effect/FileSystem" |
| 15 | import * as Etag from "effect/http/Etag" |
| 16 | import * as Platform from "effect/http/HttpPlatform" |
| 17 | import * as Response from "effect/http/HttpServerResponse" |
| 18 | import * as Layer from "effect/Layer" |
| 19 | import * as BunFileSystem from "./BunFileSystem.ts" |
| 20 | |
| 21 | // Bun's CompressionStream supports an extended format set covering brotli and |
| 22 | // zstd |
| 23 | const compression = NodeHttpCompression.make(Platform.makeCompressionWeb({ |
| 24 | algorithms: ["gzip", "deflate", "br", "zstd"], |
| 25 | transform: (algorithm) => Platform.compressionTransformWeb(algorithm === "br" ? "brotli" : algorithm) |
| 26 | })) |
| 27 | |
| 28 | /** |
| 29 | * @category constructors |
| 30 | * @since 4.0.0 |
| 31 | */ |
| 32 | const make: Effect.Effect< |
| 33 | Platform.HttpPlatform["Service"], |
| 34 | never, |
| 35 | FileSystem | Etag.Generator |
| 36 | > = Platform.make({ |
| 37 | platform: "bun", |
| 38 | compression, |
| 39 | fileResponse(path, status, statusText, headers, start, end, contentLength) { |
| 40 | let file = Bun.file(path) |
| 41 | if (start > 0 || end !== undefined) { |
| 42 | file = file.slice(start, end) |
| 43 | } |
| 44 | return Response.raw(file, { |
| 45 | headers: { ...headers, "content-length": contentLength.toString() }, |
| 46 | status, |
| 47 | statusText |
| 48 | }) |
| 49 | }, |
| 50 | fileWebResponse(file, status, statusText, headers, options) { |
| 51 | const start = options?.offset ?? 0 |
| 52 | const end = options?.bytesToRead !== undefined ? start + options.bytesToRead : undefined |
| 53 | const body = start > 0 || end !== undefined |
| 54 | ? (file as File).slice(start, end, file.type) |
| 55 | : file |
| 56 | return Response.raw(body, { headers, status, statusText }) |
| 57 | } |
| 58 | }) |
| 59 | |
| 60 | /** |
| 61 | * Layer that provides the Bun `HttpPlatform`, including file responses backed by `Bun.file`. |
| 62 | * |
| 63 | * @category layers |
| 64 | * @since 4.0.0 |
| 65 | */ |
| 66 | export const layer = Layer.effect(Platform.HttpPlatform)(make).pipe( |
| 67 | Layer.provide(BunFileSystem.layer), |
| 68 | Layer.provide(Etag.layer) |
| 69 | ) |