Sync engine (#298)

Fixes #261

plug-api/plugos-syscall/fs.ts

@@ -1,36 +1,48 @@
 import { syscall } from "./syscall.ts";
+import type { FileMeta, ProxyFileSystem } from "./types.ts";
 
-export type FileMeta = {
-  name: string;
-  lastModified: number;
-};
+export class LocalFileSystem implements ProxyFileSystem {
+  constructor(readonly root: string) {
+  }
 
-export function readFile(
-  path: string,
-  encoding: "utf8" | "dataurl" = "utf8",
-): Promise<string> {
-  return syscall("fs.readFile", path, encoding);
-}
+  readFile(
+    path: string,
+    encoding: "utf8" | "dataurl" = "utf8",
+  ): Promise<string> {
+    return syscall("fs.readFile", `${this.root}/${path}`, encoding);
+  }
 
-export function getFileMeta(path: string): Promise<FileMeta> {
-  return syscall("fs.getFileMeta", path);
-}
+  async getFileMeta(path: string): Promise<FileMeta> {
+    return this.removeRootDir(
+      await syscall("fs.getFileMeta", `${this.root}/${path}`),
+    );
+  }
 
-export function writeFile(
-  path: string,
-  text: string,
-  encoding: "utf8" | "dataurl" = "utf8",
-): Promise<FileMeta> {
-  return syscall("fs.writeFile", path, text, encoding);
-}
+  writeFile(
+    path: string,
+    text: string,
+    encoding: "utf8" | "dataurl" = "utf8",
+  ): Promise<FileMeta> {
+    return syscall("fs.writeFile", `${this.root}/${path}`, text, encoding);
+  }
 
-export function deleteFile(path: string): Promise<void> {
-  return syscall("fs.deleteFile", path);
-}
+  deleteFile(path: string): Promise<void> {
+    return syscall("fs.deleteFile", `${this.root}/${path}`);
+  }
 
-export function listFiles(
-  dirName: string,
-  recursive = false,
-): Promise<FileMeta[]> {
-  return syscall("fs.listFiles", dirName, recursive);
+  async listFiles(
+    dirName: string,
+    recursive = false,
+  ): Promise<FileMeta[]> {
+    return (await syscall(
+      "fs.listFiles",
+      `${this.root}/${dirName}`,
+      recursive,
+    )).map(this.removeRootDir.bind(this));
+  }
+
+  private removeRootDir(fileMeta: FileMeta): FileMeta {
+    fileMeta.name = fileMeta.name.substring(this.root.length + 1);
+    return fileMeta;
+  }
 }

plug-api/plugos-syscall/mod.ts

@@ -1,6 +1,7 @@
 export * as asset from "./asset.ts";
 export * as events from "./event.ts";
-export * as fs from "./fs.ts";
+// export * as fs from "./fs.ts";
+export { LocalFileSystem } from "./fs.ts";
 export * as sandbox from "./sandbox.ts";
 export * as fulltext from "./fulltext.ts";
 export * as shell from "./shell.ts";

plug-api/plugos-syscall/types.ts

@@ -0,0 +1,25 @@
+export type FileMeta = {
+  name: string;
+  lastModified: number;
+};
+
+export interface ProxyFileSystem {
+  readFile(
+    path: string,
+    encoding: "utf8" | "dataurl",
+  ): Promise<string>;
+
+  getFileMeta(path: string): Promise<FileMeta>;
+
+  writeFile(
+    path: string,
+    text: string,
+    encoding: "utf8" | "dataurl",
+  ): Promise<FileMeta>;
+
+  deleteFile(path: string): Promise<void>;
+
+  listFiles(
+    path: string,
+  ): Promise<FileMeta[]>;
+}