1 files changed, 71 insertions, 0 deletions
diff --git a/viewer/loader.ts b/viewer/loader.ts
new file mode 100644
index 0000000..487102f
--- /dev/null
+++ b/viewer/loader.ts
@@ -0,0 +1,71 @@
+import { Resource, RespackEntry } from "./resources.ts";
+
+export abstract class Loader {
+    num_loading: number = 0
+    abstract download(res: Resource<undefined>): Promise<Uint8Array>
+    abstract get_entry(): Promise<Resource<RespackEntry>>;
+    abstract wait_ready(): Promise<void>
+}
+
+export class HTTPLoader extends Loader {
+    constructor() {
+        super();
+    }
+    // deno-lint-ignore require-await
+    async wait_ready(): Promise<void> {
+        return
+    }
+    async download<T>(res: Resource<T>): Promise<Uint8Array> {
+        this.num_loading += 1
+        const resp = await fetch(`http://127.0.0.1:28556/${res.toString()}`)
+        if (!resp.ok) throw new Error("aaaa");
+        const buf = await resp.bytes()
+        this.num_loading -= 1
+        return buf
+    }
+    async get_entry(): Promise<Resource<RespackEntry>> {
+        const resp = await fetch("http://127.0.0.1:28556/entry")
+        if (!resp.ok) throw new Error("aaaa");
+        return new Resource(await resp.bytes())
+    }
+}
+export class WSLoader extends Loader {
+    ws: WebSocket
+    queue: ((r: Uint8Array) => void)[] = []
+    constructor() {
+        super()
+        this.ws = new WebSocket(`http://127.0.0.1:28557/`)
+        this.ws.onopen = () => console.log("open");
+        this.ws.onclose = () => console.log("close");
+        this.ws.onmessage = m => {
+            if (typeof m.data == "string") throw new Error(m.data);
+            if (m.data instanceof Blob) {
+                const h = this.queue.shift()!
+                m.data.arrayBuffer()
+                    .then(b => new Uint8Array(b))
+                    .then(h)
+                    .then(() => this.num_loading -= 1)
+            }
+        }
+    }
+    wait_ready(): Promise<void> {
+        return new Promise(resolve => {
+            if (this.ws.readyState == this.ws.OPEN) return resolve()
+            else this.ws.addEventListener("open", () => resolve())
+        })
+    }
+    download<T>(res: Resource<T>): Promise<Uint8Array> {
+        return new Promise(resolve => {
+            this.num_loading += 1
+            this.queue.push(resolve)
+            this.ws.send(res.hash)
+        })
+    }
+    get_entry(): Promise<Resource<RespackEntry>> {
+        return new Promise(resolve => {
+            this.num_loading += 1
+            this.queue.push(buf => resolve(new Resource(buf)))
+            this.ws.send("entry")
+        })
+    }
+}