fix: bump version

Cargo.lock

@@ -153,6 +153,15 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "ctor"
 version = "0.4.2"
@@ -227,6 +236,8 @@ dependencies = [
 name = "droplet"
 version = "0.7.0"
 dependencies = [
+ "dyn-clone",
+ "flate2",
  "hex",
  "md5",
  "napi",
@@ -261,6 +272,22 @@ version = "0.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7454e41ff9012c00d53cf7f475c5e3afa3b91b7c90568495495e8d9bf47a1055"
 
+[[package]]
+name = "dyn-clone"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0881ea181b1df73ff77ffaaf9c7544ecc11e82fba9b5f27b262a3c73a332555"
+
+[[package]]
+name = "flate2"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a3d7db9596fecd151c5f638c0ee5d5bd487b6e0ea232e5dc96d5250f6f94b1d"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "futures-core"
 version = "0.3.31"

Cargo.toml

@@ -25,6 +25,8 @@ ring = "0.17.14"
 tokio = { version = "1.45.1", features = ["fs", "io-util"] }
 tokio-util = { version = "0.7.15", features = ["codec"] }
 rawzip = "0.3.0"
+dyn-clone = "1.0.20"
+flate2 = "1.1.2"
 
 [package.metadata.patch]
 crates = ["rawzip"]

__test__/manifest.spec.mjs

@@ -2,7 +2,7 @@ import test from "ava";
 import fs from "node:fs";
 import path from "path";
 
-import { generateManifest, listFiles } from "../index.js";
+import { DropletHandler, generateManifest } from "../index.js";
 
 test("numerous small file", async (t) => {
   // Setup test dir
@@ -18,9 +18,12 @@ test("numerous small file", async (t) => {
     fs.writeFileSync(fileName, i.toString());
   }
 
+  const dropletHandler = new DropletHandler();
+
   const manifest = JSON.parse(
     await new Promise((r, e) =>
       generateManifest(
+        dropletHandler,
         dirName,
         (_, __) => {},
         (_, __) => {},
@@ -56,7 +59,6 @@ test("numerous small file", async (t) => {
 
 test.skip("performance test", async (t) => {
   t.timeout(5 * 60 * 1000);
-  return t.pass();
   const dirName = "./.test/pt";
   if (fs.existsSync(dirName)) fs.rmSync(dirName, { recursive: true });
   fs.mkdirSync(dirName, { recursive: true });
@@ -73,9 +75,12 @@ test.skip("performance test", async (t) => {
     randomStream.on("end", r);
   });
 
+  const dropletHandler = new DropletHandler();
+
   const start = Date.now();
   await new Promise((r, e) =>
     generateManifest(
+      dropletHandler,
       dirName,
       (_, __) => {},
       (_, __) => {},

__test__/utils.spec.mjs

@@ -2,7 +2,7 @@ import test from "ava";
 import fs from "node:fs";
 import path from "path";
 
-import droplet, { generateManifest } from "../index.js";
+import droplet, { DropletHandler, generateManifest } from "../index.js";
 
 test("check alt thread util", async (t) => {
   let endtime1, endtime2;
@@ -23,6 +23,28 @@ test("check alt thread util", async (t) => {
   t.pass();
 });
 
+test("list files", async (t) => {
+  const dirName = "./.listfiles";
+  if (fs.existsSync(dirName)) fs.rmSync(dirName, { recursive: true });
+  fs.mkdirSync(dirName, { recursive: true });
+  fs.mkdirSync(dirName + "/subdir", { recursive: true });
+  fs.mkdirSync(dirName + "/subddir", { recursive: true });
+
+  fs.writeFileSync(dirName + "/root.txt", "root");
+  fs.writeFileSync(dirName + "/subdir/one.txt", "the first subdir");
+  fs.writeFileSync(dirName + "/subddir/two.txt", "the second");
+
+  const dropletHandler = new DropletHandler();
+  const files = dropletHandler.listFiles(dirName);
+
+  t.assert(
+    files.sort().join("\n"),
+    ["root.txt", "subddir/two.txt", "subdir/one.txt"].join("\n")
+  );
+
+  fs.rmSync(dirName, { recursive: true });
+});
+
 test("read file", async (t) => {
   const dirName = "./.test2";
   if (fs.existsSync(dirName)) fs.rmSync(dirName, { recursive: true });
@@ -32,11 +54,13 @@ test("read file", async (t) => {
 
   fs.writeFileSync(dirName + "/TESTFILE", testString);
 
-  const stream = droplet.readFile(dirName, "TESTFILE");
+  const dropletHandler = new DropletHandler();
+
+  const stream = dropletHandler.readFile(dirName, "TESTFILE");
 
   let finalString = "";
 
-  for await (const chunk of stream) {
+  for await (const chunk of stream.getStream()) {
     // Do something with each 'chunk'
     finalString += String.fromCharCode.apply(null, chunk);
   }
@@ -53,11 +77,12 @@ test("read file offset", async (t) => {
   const testString = "0123456789";
   fs.writeFileSync(dirName + "/TESTFILE", testString);
 
-  const stream = droplet.readFile(dirName, "TESTFILE", BigInt(1), BigInt(4));
+  const dropletHandler = new DropletHandler();
+  const stream = dropletHandler.readFile(dirName, "TESTFILE", BigInt(1), BigInt(4));
 
   let finalString = "";
 
-  for await (const chunk of stream) {
+  for await (const chunk of stream.getStream()) {
     // Do something with each 'chunk'
     finalString += String.fromCharCode.apply(null, chunk);
   }
@@ -73,9 +98,13 @@ test("read file offset", async (t) => {
 
 test("zip file reader", async (t) => {
   return t.pass();
+
+  t.timeout(10_000);
+  const dropletHandler = new DropletHandler();
   const manifest = JSON.parse(
     await new Promise((r, e) =>
       generateManifest(
+        dropletHandler,
         "./assets/TheGame.zip",
         (_, __) => {},
         (_, __) => {},
@@ -84,17 +113,20 @@ test("zip file reader", async (t) => {
     )
   );
 
-  console.log(manifest);
+  const stream = dropletHandler.readFile(
+    "./assets/TheGame.zip",
+    "setup.exe",
+    BigInt(10),
+    BigInt(20)
+  );
 
-  return t.pass();
-  const stream = droplet.readFile("./assets/TheGame.zip", "TheGame/setup.exe");
 
-  let finalString;
+  let finalString = "";
-  for await (const chunk of stream) {
+  for await (const chunk of stream.getStream()) {
-    console.log(`read chunk ${chunk}`);
     // Do something with each 'chunk'
-    finalString += String.fromCharCode.apply(null, chunk);
+    finalString = String.fromCharCode.apply(null, chunk);
+    if(finalString.length > 100) break;
   }
 
-  console.log(finalString);
+  t.pass();
 });

assets/generate.sh

@@ -1,3 +1,3 @@
-dd if=/dev/random of=./setup.exe bs=1024 count=1000000
+yes "droplet is awesome" | dd of=./setup.exe bs=1024 count=1000000
 zip TheGame.zip setup.exe
 rm setup.exe

index.d.ts

@@ -1,24 +1,28 @@
 /* auto-generated by NAPI-RS */
 /* eslint-disable */
+/**
+ * Persistent object so we can cache things between commands
+ */
+export declare class DropletHandler {
+  constructor()
+  hasBackendForPath(path: string): boolean
+  listFiles(path: string): Array<string>
+  peekFile(path: string, subPath: string): bigint
+  readFile(path: string, subPath: string, start?: bigint | undefined | null, end?: bigint | undefined | null): JsDropStreamable
+}
+
+export declare class JsDropStreamable {
+  getStream(): any
+}
+
 export declare function callAltThreadFunc(tsfn: ((err: Error | null, ) => any)): void
 
 export declare function generateClientCertificate(clientId: string, clientName: string, rootCa: string, rootCaPrivate: string): Array<string>
 
-export declare function generateManifest(dir: string, progressSfn: ((err: Error | null, arg: number) => any), logSfn: ((err: Error | null, arg: string) => any), callbackSfn: ((err: Error | null, arg: string) => any)): void
+export declare function generateManifest(dropletHandler: DropletHandler, dir: string, progressSfn: ((err: Error | null, arg: number) => any), logSfn: ((err: Error | null, arg: string) => any), callbackSfn: ((err: Error | null, arg: string) => any)): void
 
 export declare function generateRootCa(): Array<string>
 
-export declare function hasBackendForPath(path: string): boolean
-
-export declare function listFiles(path: string): Array<string>
-
-/**
- * This is inefficient, but is used in attempt to keep the interface simple
- */
-export declare function peekFile(path: string, subPath: string): bigint
-
-export declare function readFile(path: string, subPath: string, start?: bigint | undefined | null, end?: bigint | undefined | null): ReadableStream<Buffer> | null
-
 export declare function signNonce(privateKey: string, nonce: string): string
 
 export declare function verifyClientCertificate(clientCert: string, rootCa: string): boolean

index.js

@@ -376,14 +376,12 @@ if (!nativeBinding) {
 }
 
 module.exports = nativeBinding
+module.exports.DropletHandler = nativeBinding.DropletHandler
+module.exports.JsDropStreamable = nativeBinding.JsDropStreamable
 module.exports.callAltThreadFunc = nativeBinding.callAltThreadFunc
 module.exports.generateClientCertificate = nativeBinding.generateClientCertificate
 module.exports.generateManifest = nativeBinding.generateManifest
 module.exports.generateRootCa = nativeBinding.generateRootCa
-module.exports.hasBackendForPath = nativeBinding.hasBackendForPath
-module.exports.listFiles = nativeBinding.listFiles
-module.exports.peekFile = nativeBinding.peekFile
-module.exports.readFile = nativeBinding.readFile
 module.exports.signNonce = nativeBinding.signNonce
 module.exports.verifyClientCertificate = nativeBinding.verifyClientCertificate
 module.exports.verifyNonce = nativeBinding.verifyNonce

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@drop-oss/droplet",
-  "version": "1.6.0",
+  "version": "2.0.1",
   "main": "index.js",
   "types": "index.d.ts",
   "napi": {
@@ -27,7 +27,14 @@
     "ava": "^6.2.0"
   },
   "ava": {
-    "timeout": "3m"
+    "timeout": "3m",
+    "extensions": [
+      "cjs",
+      "mjs",
+      "js",
+      "ts",
+      "mts"
+    ]
   },
   "engines": {
     "node": ">= 10"
@@ -44,5 +51,8 @@
   "packageManager": "yarn@4.7.0",
   "repository": {
     "url": "git+https://github.com/Drop-OSS/droplet.git"
+  },
+  "dependencies": {
+    "tsimp": "^2.0.12"
   }
 }

src/manifest.rs

@@ -13,8 +13,7 @@ use napi::{
 use serde_json::json;
 use uuid::Uuid;
 
-use crate::version::utils::create_backend_for_path;
+use crate::version::{types::VersionBackend, utils::DropletHandler};
-
 
 const CHUNK_SIZE: usize = 1024 * 1024 * 64;
 
@@ -36,15 +35,18 @@ pub fn call_alt_thread_func(tsfn: Arc<ThreadsafeFunction<()>>) -> Result<(), Str
 }
 
 #[napi]
-pub fn generate_manifest(
+pub fn generate_manifest<'a>(
+  droplet_handler: &mut DropletHandler,
   dir: String,
   progress_sfn: ThreadsafeFunction<i32>,
   log_sfn: ThreadsafeFunction<String>,
   callback_sfn: ThreadsafeFunction<String>,
-) -> Result<(), String> {
+) -> Result<()> {
+  let backend: &mut Box<dyn VersionBackend + Send> =
+    droplet_handler.create_backend_for_path(dir).ok_or(napi::Error::from_reason("Could not create backend for path."))?;
+  let backend: &'static mut Box<dyn VersionBackend + Send> =
+    unsafe { std::mem::transmute(backend) };
   thread::spawn(move || {
-    let base_dir = Path::new(&dir);
-    let mut backend = create_backend_for_path(base_dir).unwrap();
     let files = backend.list_files();
 
     // Filepath to chunk data
@@ -54,7 +56,7 @@ pub fn generate_manifest(
     let mut i: i32 = 0;
 
     for version_file in files {
-      let raw_reader= backend.reader(&version_file).unwrap();
+      let raw_reader = backend.reader(&version_file).unwrap();
       let mut reader = BufReader::with_capacity(CHUNK_SIZE, raw_reader);
 
       let mut chunk_data = ChunkData {

src/version/backends.rs

@@ -1,24 +1,34 @@
-use core::arch;
 #[cfg(unix)]
 use std::os::unix::fs::PermissionsExt;
 use std::{
-  fs::File,
+  fs::{self, metadata, File},
-  io::{self, Read, Seek},
+  io::{self, Read, Sink},
-  path::PathBuf,
+  path::{Path, PathBuf},
-  pin::Pin,
-  rc::Rc,
   sync::Arc,
 };
 
+use flate2::read::DeflateDecoder;
 use rawzip::{
-  FileReader, ReaderAt, ZipArchive, ZipArchiveEntryWayfinder, ZipEntry, RECOMMENDED_BUFFER_SIZE,
+  FileReader, ZipArchive, ZipArchiveEntryWayfinder, ZipEntry, ZipReader, RECOMMENDED_BUFFER_SIZE,
 };
 
-use crate::version::{
+use crate::version::types::{MinimumFileObject, Skippable, VersionBackend, VersionFile};
-  types::{MinimumFileObject, Skippable, VersionBackend, VersionFile},
-  utils::_list_files,
-};
 
+pub fn _list_files(vec: &mut Vec<PathBuf>, path: &Path) {
+  if metadata(path).unwrap().is_dir() {
+    let paths = fs::read_dir(path).unwrap();
+    for path_result in paths {
+      let full_path = path_result.unwrap().path();
+      if metadata(&full_path).unwrap().is_dir() {
+        _list_files(vec, &full_path);
+      } else {
+        vec.push(full_path);
+      }
+    }
+  }
+}
+
+#[derive(Clone)]
 pub struct PathVersionBackend {
   pub base_dir: PathBuf,
 }
@@ -30,8 +40,31 @@ impl VersionBackend for PathVersionBackend {
     let mut results = Vec::new();
 
     for pathbuf in vec.iter() {
-      let file = File::open(pathbuf.clone()).unwrap();
       let relative = pathbuf.strip_prefix(self.base_dir.clone()).unwrap();
+
+      results.push(
+        self
+          .peek_file(relative.to_str().unwrap().to_owned())
+          .unwrap(),
+      );
+    }
+
+    results
+  }
+
+  fn reader(&mut self, file: &VersionFile) -> Option<Box<dyn MinimumFileObject + 'static>> {
+    let file = File::open(self.base_dir.join(file.relative_filename.clone())).ok()?;
+
+    return Some(Box::new(file));
+  }
+
+  fn peek_file(&mut self, sub_path: String) -> Option<VersionFile> {
+    let pathbuf = self.base_dir.join(sub_path.clone());
+    if !pathbuf.exists() {
+      return None;
+    };
+
+    let file = File::open(pathbuf.clone()).unwrap();
     let metadata = file.try_clone().unwrap().metadata().unwrap();
     let permission_object = metadata.permissions();
     let permissions = {
@@ -47,23 +80,15 @@ impl VersionBackend for PathVersionBackend {
       perm
     };
 
-      results.push(VersionFile {
+    Some(VersionFile {
-        relative_filename: relative.to_string_lossy().to_string(),
+      relative_filename: sub_path,
       permission: permissions,
       size: metadata.len(),
-      });
+    })
-    }
-
-    results
-  }
-
-  fn reader(&mut self, file: &VersionFile) -> Option<Box<(dyn MinimumFileObject + 'static)>> {
-    let file = File::open(self.base_dir.join(file.relative_filename.clone())).ok()?;
-
-    return Some(Box::new(file));
   }
 }
 
+#[derive(Clone)]
 pub struct ZipVersionBackend {
   archive: Arc<ZipArchive<FileReader>>,
 }
@@ -75,46 +100,51 @@ impl ZipVersionBackend {
     }
   }
 
-  pub fn new_entry(
+  pub fn new_entry<'archive>(
     &self,
-    entry: ZipEntry<'_, FileReader>,
+    entry: ZipEntry<'archive, FileReader>,
-    wayfinder: ZipArchiveEntryWayfinder,
+  ) -> ZipFileWrapper<'archive> {
-  ) -> ZipFileWrapper {
+    let deflater = DeflateDecoder::new(entry.reader());
-    let (offset, end_offset) = entry.compressed_data_range();
+    ZipFileWrapper { reader: deflater }
-    ZipFileWrapper {
-      archive: self.archive.clone(),
-      wayfinder,
-      offset,
-      end_offset,
-    }
   }
 }
 
-pub struct ZipFileWrapper {
+pub struct ZipFileWrapper<'archive> {
-  pub archive: Arc<ZipArchive<FileReader>>,
+  reader: DeflateDecoder<ZipReader<'archive, FileReader>>,
-  wayfinder: ZipArchiveEntryWayfinder,
-  offset: u64,
-  end_offset: u64,
 }
 
-impl Read for ZipFileWrapper {
+impl<'a> Read for ZipFileWrapper<'a> {
   fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
-    let read_size = buf.len().min((self.end_offset - self.offset) as usize);
+    let read = self.reader.read(buf)?;
-    let read = self
-      .archive
-      .get_ref()
-      .read_at(&mut buf[..read_size], self.offset)?;
-    self.offset += read as u64;
     Ok(read)
   }
 }
-impl Skippable for ZipFileWrapper {
+impl<'a> Skippable for ZipFileWrapper<'a> {
   fn skip(&mut self, amount: u64) {
-    self.offset += amount;
+    io::copy(&mut self.reader.by_ref().take(amount), &mut Sink::default()).unwrap();
   }
 }
-impl MinimumFileObject for ZipFileWrapper {}
+impl<'a> MinimumFileObject for ZipFileWrapper<'a> {}
 
+impl ZipVersionBackend {
+  fn find_wayfinder(&mut self, filename: &str) -> Option<ZipArchiveEntryWayfinder> {
+    let read_buffer = &mut [0u8; RECOMMENDED_BUFFER_SIZE];
+    let mut entries = self.archive.entries(read_buffer);
+    let entry = loop {
+      if let Some(v) = entries.next_entry().unwrap() {
+        if v.file_path().try_normalize().unwrap().as_ref() == filename {
+          break Some(v);
+        }
+      } else {
+        break None;
+      }
+    }?;
+
+    let wayfinder = entry.wayfinder();
+
+    Some(wayfinder)
+  }
+}
 impl VersionBackend for ZipVersionBackend {
   fn list_files(&mut self) -> Vec<VersionFile> {
     let mut results = Vec::new();
@@ -133,24 +163,22 @@ impl VersionBackend for ZipVersionBackend {
     results
   }
 
-  fn reader(&mut self, file: &VersionFile) -> Option<Box<(dyn MinimumFileObject)>> {
+  fn reader(&mut self, file: &VersionFile) -> Option<Box<dyn MinimumFileObject + '_>> {
-    let read_buffer = &mut [0u8; RECOMMENDED_BUFFER_SIZE];
+    let wayfinder = self.find_wayfinder(&file.relative_filename)?;
-    let mut entries = self.archive.entries(read_buffer);
-    let entry = loop {
-      if let Some(v) = entries.next_entry().unwrap() {
-        if v.file_path().try_normalize().unwrap().as_ref() == &file.relative_filename {
-          break Some(v);
-        }
-      } else {
-        break None;
-      }
-    }?;
-
-    let wayfinder = entry.wayfinder();
     let local_entry = self.archive.get_entry(wayfinder).unwrap();
 
-    let wrapper = self.new_entry(local_entry, wayfinder);
+    let wrapper = self.new_entry(local_entry);
 
     Some(Box::new(wrapper))
   }
+
+  fn peek_file(&mut self, sub_path: String) -> Option<VersionFile> {
+    let entry = self.find_wayfinder(&sub_path)?;
+
+    Some(VersionFile {
+      relative_filename: sub_path,
+      permission: 0,
+      size: entry.uncompressed_size_hint(),
+    })
+  }
 }

src/version/types.rs

@@ -1,7 +1,9 @@
 use std::{
-  fmt::Debug, io::{Read, Seek, SeekFrom}
+  fmt::Debug,
+  io::{Read, Seek, SeekFrom},
 };
 
+use dyn_clone::DynClone;
 use tokio::io::{self, AsyncRead};
 
 #[derive(Debug, Clone)]
@@ -27,12 +29,11 @@ pub trait MinimumFileObject: Read + Send + Skippable {}
 impl<T: Read + Send + Seek> MinimumFileObject for T {}
 
 // Intentionally not a generic, because of types in read_file
-pub struct ReadToAsyncRead {
+pub struct ReadToAsyncRead<'a> {
-  pub inner: Box<(dyn Read + Send)>,
+  pub inner: Box<dyn Read + Send + 'a>,
-  pub backend: Box<(dyn VersionBackend + Send)>,
 }
 
-impl AsyncRead for ReadToAsyncRead {
+impl<'a> AsyncRead for ReadToAsyncRead<'a> {
   fn poll_read(
     mut self: std::pin::Pin<&mut Self>,
     _cx: &mut std::task::Context<'_>,
@@ -40,13 +41,16 @@ impl AsyncRead for ReadToAsyncRead {
   ) -> std::task::Poll<io::Result<()>> {
     let mut read_buf = [0u8; 8192];
     let var_name = self.inner.read(&mut read_buf).unwrap();
-    let amount = var_name;
+    let amount = var_name.min(buf.remaining());
     buf.put_slice(&read_buf[0..amount]);
     std::task::Poll::Ready(Ok(()))
   }
 }
 
-pub trait VersionBackend {
+pub trait VersionBackend: DynClone {
   fn list_files(&mut self) -> Vec<VersionFile>;
-  fn reader(&mut self, file: &VersionFile) -> Option<Box<(dyn MinimumFileObject)>>;
+  fn peek_file(&mut self, sub_path: String) -> Option<VersionFile>;
+  fn reader(&mut self, file: &VersionFile) -> Option<Box<dyn MinimumFileObject + '_>>;
 }
+
+dyn_clone::clone_trait_object!(VersionBackend);

src/version/utils.rs

@@ -1,10 +1,6 @@
-use std::{
+use std::{collections::HashMap, fs::File, io::Read, path::Path};
-  fs::{self, metadata, File},
-  io::Read,
-  path::{Path, PathBuf},
-};
 
-use napi::{bindgen_prelude::*, tokio_stream::StreamExt};
+use napi::{bindgen_prelude::*, sys::napi_value__, tokio_stream::StreamExt};
 use tokio_util::codec::{BytesCodec, FramedRead};
 
 use crate::version::{
@@ -12,90 +8,115 @@ use crate::version::{
   types::{ReadToAsyncRead, VersionBackend, VersionFile},
 };
 
-pub fn _list_files(vec: &mut Vec<PathBuf>, path: &Path) {
+/**
-  if metadata(path).unwrap().is_dir() {
+ * Append new backends here
-    let paths = fs::read_dir(path).unwrap();
+ */
-    for path_result in paths {
+pub fn create_backend_constructor<'a>(
-      let full_path = path_result.unwrap().path();
+  path: &Path,
-      if metadata(&full_path).unwrap().is_dir() {
+) -> Option<Box<dyn FnOnce() -> Box<dyn VersionBackend + Send + 'a>>> {
-        _list_files(vec, &full_path);
+  if !path.exists() {
-      } else {
+    return None;
-        vec.push(full_path);
   }
-    }
-  }
-}
 
-pub fn create_backend_for_path<'a>(path: &Path) -> Option<Box<(dyn VersionBackend + Send + 'a)>> {
   let is_directory = path.is_dir();
   if is_directory {
-    return Some(Box::new(PathVersionBackend {
+    let base_dir = path.to_path_buf();
-      base_dir: path.to_path_buf(),
+    return Some(Box::new(move || Box::new(PathVersionBackend { base_dir })));
-    }));
   };
 
   if path.to_string_lossy().ends_with(".zip") {
     let f = File::open(path.to_path_buf()).unwrap();
-    return Some(Box::new(ZipVersionBackend::new(f)));
+    return Some(Box::new(|| Box::new(ZipVersionBackend::new(f))));
   }
 
   None
 }
 
+/**
+ * Persistent object so we can cache things between commands
+ */
+#[napi(js_name = "DropletHandler")]
+pub struct DropletHandler<'a> {
+  backend_cache: HashMap<String, Box<dyn VersionBackend + Send + 'a>>,
+}
+
 #[napi]
-pub fn has_backend_for_path(path: String) -> bool {
+impl<'a> DropletHandler<'a> {
+  #[napi(constructor)]
+  pub fn new() -> Self {
+    DropletHandler {
+      backend_cache: HashMap::new(),
+    }
+  }
+
+  pub fn create_backend_for_path(
+    &mut self,
+    path: String,
+  ) -> Option<&mut Box<dyn VersionBackend + Send + 'a>> {
+    let fs_path = Path::new(&path);
+    let constructor = create_backend_constructor(fs_path)?;
+
+    let existing_backend = self.backend_cache.entry(path).or_insert_with(|| {
+      let backend = constructor();
+      backend
+    });
+
+    Some(existing_backend)
+  }
+
+  #[napi]
+  pub fn has_backend_for_path(&self, path: String) -> bool {
     let path = Path::new(&path);
 
-  let has_backend = create_backend_for_path(path).is_some();
+    let has_backend = create_backend_constructor(path).is_some();
 
     has_backend
-}
+  }
 
-#[napi]
+  #[napi]
-pub fn list_files(path: String) -> Result<Vec<String>> {
+  pub fn list_files(&mut self, path: String) -> Result<Vec<String>> {
-  let path = Path::new(&path);
+    let backend = self
-  let mut backend =
+      .create_backend_for_path(path)
-    create_backend_for_path(path).ok_or(napi::Error::from_reason("No backend for path"))?;
+      .ok_or(napi::Error::from_reason("No backend for path"))?;
     let files = backend.list_files();
     Ok(files.into_iter().map(|e| e.relative_filename).collect())
-}
+  }
 
-/**
+  #[napi]
- * This is inefficient, but is used in attempt to keep the interface simple
+  pub fn peek_file(&mut self, path: String, sub_path: String) -> Result<u64> {
- */
+    let backend = self
-#[napi]
+      .create_backend_for_path(path)
-pub fn peek_file(path: String, sub_path: String) -> Result<u64> {
+      .ok_or(napi::Error::from_reason("No backend for path"))?;
-  let path = Path::new(&path);
-  let mut backend =
-    create_backend_for_path(path).ok_or(napi::Error::from_reason("No backend for path"))?;
-  let files = backend.list_files();
 
-  let file = files
+    let file = backend
-    .iter()
+      .peek_file(sub_path)
-    .find(|e| e.relative_filename == sub_path)
       .ok_or(napi::Error::from_reason("Can't find file to peek"))?;
-  return Ok(file.size.try_into().unwrap());
-}
 
-#[napi]
+    return Ok(file.size.try_into().unwrap());
-pub fn read_file(
+  }
+
+  #[napi]
+  pub fn read_file(
+    &mut self,
+    reference: Reference<DropletHandler<'static>>,
     path: String,
     sub_path: String,
-  env: &Env,
+    env: Env,
     start: Option<BigInt>,
     end: Option<BigInt>,
-) -> Option<ReadableStream<'_, BufferSlice<'_>>> {
+  ) -> Result<JsDropStreamable> {
-  let path = Path::new(&path);
+    let stream = reference.share_with(env, |handler| {
-  let mut backend = create_backend_for_path(path).unwrap();
+      let backend = handler
+        .create_backend_for_path(path)
+        .ok_or(napi::Error::from_reason("Failed to create backend."))?;
       let version_file = VersionFile {
         relative_filename: sub_path,
         permission: 0, // Shouldn't matter
         size: 0,       // Shouldn't matter
       };
       // Use `?` operator for cleaner error propagation from `Option`
-  let mut reader = backend.reader(&version_file)?;
+      let mut reader = backend.reader(&version_file).ok_or(napi::Error::from_reason("Failed to create reader."))?;
 
-  // Skip the 'start' amount of bytes without seek
       if let Some(skip) = start.clone() {
         reader.skip(skip.get_u64().1.into());
         // io::copy(&mut reader.by_ref().take(skip.into()), &mut io::sink()).unwrap();
@@ -105,13 +126,9 @@ pub fn read_file(
         let amount = limit.get_u64().1 - start.map_or(Some(0), |v| Some(v.get_u64().1)).unwrap();
         ReadToAsyncRead {
           inner: Box::new(reader.take(amount.into())),
-      backend,
         }
       } else {
-    ReadToAsyncRead {
+        ReadToAsyncRead { inner: reader }
-      inner: reader,
-      backend,
-    }
       };
 
       // Create a FramedRead stream with BytesCodec for chunking
@@ -127,5 +144,24 @@ pub fn read_file(
       // Create the napi-rs ReadableStream from the tokio_stream::Stream
       // The unwrap() here means if stream creation fails, it will panic.
       // For a production system, consider returning Result<Option<...>> and handling this.
-  Some(ReadableStream::create_with_stream_bytes(env, stream).unwrap())
+      Ok(ReadableStream::create_with_stream_bytes(&env, stream).unwrap())
+    })?;
+
+    Ok(JsDropStreamable {
+      inner: stream,
+    })
+  }
+}
+
+#[napi]
+pub struct JsDropStreamable {
+  inner: SharedReference<DropletHandler<'static>, ReadableStream<'static, BufferSlice<'static>>>,
+}
+
+#[napi]
+impl JsDropStreamable {
+  #[napi]
+  pub fn get_stream(&self) -> *mut napi_value__ {
+    self.inner.raw()
+  }
 }

yarn.lock

@@ -12,6 +12,7 @@ __metadata:
     "@napi-rs/cli": "npm:3.0.0-alpha.91"
     "@types/node": "npm:^22.13.10"
     ava: "npm:^6.2.0"
+    tsimp: "npm:^2.0.12"
   languageName: unknown
   linkType: soft
 
@@ -268,6 +269,38 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@isaacs/balanced-match@npm:^4.0.1":
+  version: 4.0.1
+  resolution: "@isaacs/balanced-match@npm:4.0.1"
+  checksum: 10c0/7da011805b259ec5c955f01cee903da72ad97c5e6f01ca96197267d3f33103d5b2f8a1af192140f3aa64526c593c8d098ae366c2b11f7f17645d12387c2fd420
+  languageName: node
+  linkType: hard
+
+"@isaacs/brace-expansion@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "@isaacs/brace-expansion@npm:5.0.0"
+  dependencies:
+    "@isaacs/balanced-match": "npm:^4.0.1"
+  checksum: 10c0/b4d4812f4be53afc2c5b6c545001ff7a4659af68d4484804e9d514e183d20269bb81def8682c01a22b17c4d6aed14292c8494f7d2ac664e547101c1a905aa977
+  languageName: node
+  linkType: hard
+
+"@isaacs/cached@npm:^1.0.1":
+  version: 1.0.1
+  resolution: "@isaacs/cached@npm:1.0.1"
+  dependencies:
+    "@isaacs/catcher": "npm:^1.0.0"
+  checksum: 10c0/1c15dc2a60873f2c73f4b04ed59ecfc8d9679976ff09af1b5b45e7273a590a4f86a339cc4c785c2d22309277ca47293611af20dd7d41550cdcfb53e06a04ac65
+  languageName: node
+  linkType: hard
+
+"@isaacs/catcher@npm:^1.0.0, @isaacs/catcher@npm:^1.0.4":
+  version: 1.0.4
+  resolution: "@isaacs/catcher@npm:1.0.4"
+  checksum: 10c0/d8b77e2c6b84a6301d390d0b2badea1b4a321f2e8ba662645b045efc42f20a54a6c760f3181fab4ed0d90da58f2cb084a93490a892c53b4da21ec05278b8ba4f
+  languageName: node
+  linkType: hard
+
 "@isaacs/cliui@npm:^8.0.2":
   version: 8.0.2
   resolution: "@isaacs/cliui@npm:8.0.2"
@@ -1756,7 +1789,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"foreground-child@npm:^3.1.0":
+"foreground-child@npm:^3.1.0, foreground-child@npm:^3.1.1, foreground-child@npm:^3.3.1":
   version: 3.3.1
   resolution: "foreground-child@npm:3.3.1"
   dependencies:
@@ -1812,6 +1845,22 @@ __metadata:
   languageName: node
   linkType: hard
 
+"glob@npm:^11.0.0":
+  version: 11.0.3
+  resolution: "glob@npm:11.0.3"
+  dependencies:
+    foreground-child: "npm:^3.3.1"
+    jackspeak: "npm:^4.1.1"
+    minimatch: "npm:^10.0.3"
+    minipass: "npm:^7.1.2"
+    package-json-from-dist: "npm:^1.0.0"
+    path-scurry: "npm:^2.0.0"
+  bin:
+    glob: dist/esm/bin.mjs
+  checksum: 10c0/7d24457549ec2903920dfa3d8e76850e7c02aa709122f0164b240c712f5455c0b457e6f2a1eee39344c6148e39895be8094ae8cfef7ccc3296ed30bce250c661
+  languageName: node
+  linkType: hard
+
 "glob@npm:^7.1.3":
   version: 7.2.3
   resolution: "glob@npm:7.2.3"
@@ -1996,6 +2045,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"jackspeak@npm:^4.1.1":
+  version: 4.1.1
+  resolution: "jackspeak@npm:4.1.1"
+  dependencies:
+    "@isaacs/cliui": "npm:^8.0.2"
+  checksum: 10c0/84ec4f8e21d6514db24737d9caf65361511f75e5e424980eebca4199f400874f45e562ac20fa8aeb1dd20ca2f3f81f0788b6e9c3e64d216a5794fd6f30e0e042
+  languageName: node
+  linkType: hard
+
 "js-string-escape@npm:^1.0.1":
   version: 1.0.1
   resolution: "js-string-escape@npm:1.0.1"
@@ -2063,6 +2121,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"lru-cache@npm:^11.0.0":
+  version: 11.1.0
+  resolution: "lru-cache@npm:11.1.0"
+  checksum: 10c0/85c312f7113f65fae6a62de7985348649937eb34fb3d212811acbf6704dc322a421788aca253b62838f1f07049a84cc513d88f494e373d3756514ad263670a64
+  languageName: node
+  linkType: hard
+
 "matcher@npm:^5.0.0":
   version: 5.0.0
   resolution: "matcher@npm:5.0.0"
@@ -2114,6 +2179,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"minimatch@npm:^10.0.3":
+  version: 10.0.3
+  resolution: "minimatch@npm:10.0.3"
+  dependencies:
+    "@isaacs/brace-expansion": "npm:^5.0.0"
+  checksum: 10c0/e43e4a905c5d70ac4cec8530ceaeccb9c544b1ba8ac45238e2a78121a01c17ff0c373346472d221872563204eabe929ad02669bb575cb1f0cc30facab369f70f
+  languageName: node
+  linkType: hard
+
 "minimatch@npm:^3.1.1":
   version: 3.1.2
   resolution: "minimatch@npm:3.1.2"
@@ -2311,6 +2385,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"path-scurry@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "path-scurry@npm:2.0.0"
+  dependencies:
+    lru-cache: "npm:^11.0.0"
+    minipass: "npm:^7.1.2"
+  checksum: 10c0/3da4adedaa8e7ef8d6dc4f35a0ff8f05a9b4d8365f2b28047752b62d4c1ad73eec21e37b1579ef2d075920157856a3b52ae8309c480a6f1a8bbe06ff8e52b33c
+  languageName: node
+  linkType: hard
+
 "path-type@npm:^6.0.0":
   version: 6.0.0
   resolution: "path-type@npm:6.0.0"
@@ -2332,6 +2416,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"pirates@npm:^4.0.6":
+  version: 4.0.7
+  resolution: "pirates@npm:4.0.7"
+  checksum: 10c0/a51f108dd811beb779d58a76864bbd49e239fa40c7984cd11596c75a121a8cc789f1c8971d8bb15f0dbf9d48b76c05bb62fcbce840f89b688c0fa64b37e8478a
+  languageName: node
+  linkType: hard
+
 "plur@npm:^5.1.0":
   version: 5.1.0
   resolution: "plur@npm:5.1.0"
@@ -2398,6 +2489,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"rimraf@npm:^6.0.1":
+  version: 6.0.1
+  resolution: "rimraf@npm:6.0.1"
+  dependencies:
+    glob: "npm:^11.0.0"
+    package-json-from-dist: "npm:^1.0.0"
+  bin:
+    rimraf: dist/esm/bin.mjs
+  checksum: 10c0/b30b6b072771f0d1e73b4ca5f37bb2944ee09375be9db5f558fcd3310000d29dfcfa93cf7734d75295ad5a7486dc8e40f63089ced1722a664539ffc0c3ece8c6
+  languageName: node
+  linkType: hard
+
 "run-parallel@npm:^1.1.9":
   version: 1.2.0
   resolution: "run-parallel@npm:1.2.0"
@@ -2481,6 +2584,24 @@ __metadata:
   languageName: node
   linkType: hard
 
+"sock-daemon@npm:^1.4.2":
+  version: 1.4.2
+  resolution: "sock-daemon@npm:1.4.2"
+  dependencies:
+    rimraf: "npm:^5.0.5"
+    signal-exit: "npm:^4.1.0"
+    socket-post-message: "npm:^1.0.3"
+  checksum: 10c0/1b5e0b02fdd8cd5454fc7de80557c11aac5d88085d0cee80ead08b8f4df5e3c0a4b50ebb2ae2113dab94f36dc88b5d3b7d4b1c2c8e53bbcfbddfc741abf3bd00
+  languageName: node
+  linkType: hard
+
+"socket-post-message@npm:^1.0.3":
+  version: 1.0.3
+  resolution: "socket-post-message@npm:1.0.3"
+  checksum: 10c0/d3ffb51dad97754856aaa6709e036196f4b8b674f00366b71591ead122bcdbc073827f67d17c8b03c9a28c921b2c7cb277c581f6ca318d472034eae7afc169d1
+  languageName: node
+  linkType: hard
+
 "sprintf-js@npm:~1.0.2":
   version: 1.0.3
   resolution: "sprintf-js@npm:1.0.3"
@@ -2613,6 +2734,27 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tsimp@npm:^2.0.12":
+  version: 2.0.12
+  resolution: "tsimp@npm:2.0.12"
+  dependencies:
+    "@isaacs/cached": "npm:^1.0.1"
+    "@isaacs/catcher": "npm:^1.0.4"
+    foreground-child: "npm:^3.1.1"
+    mkdirp: "npm:^3.0.1"
+    pirates: "npm:^4.0.6"
+    rimraf: "npm:^6.0.1"
+    signal-exit: "npm:^4.1.0"
+    sock-daemon: "npm:^1.4.2"
+    walk-up-path: "npm:^4.0.0"
+  peerDependencies:
+    typescript: ^5.1.0
+  bin:
+    tsimp: dist/esm/bin.mjs
+  checksum: 10c0/c56c03a6a4df3ab5ebcefcc0b473992cbb7150173c331be6bda01670d5ae3965e65f30c42757cd391100a1c21485e167a05a350d875f41826b35c45008e5fac8
+  languageName: node
+  linkType: hard
+
 "tslib@npm:^2.4.0":
   version: 2.8.1
   resolution: "tslib@npm:2.8.1"
@@ -2669,6 +2811,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"walk-up-path@npm:^4.0.0":
+  version: 4.0.0
+  resolution: "walk-up-path@npm:4.0.0"
+  checksum: 10c0/fabe344f91387d1d41df230af962ef18bf703dd4178006d55cd6412caacd187b54440002d4d53a982d4f7f0455567dcffb6d3884533c8b2268928eca3ebd8a19
+  languageName: node
+  linkType: hard
+
 "wasm-sjlj@npm:^1.0.6":
   version: 1.0.6
   resolution: "wasm-sjlj@npm:1.0.6"