Refactor stream

src/helpers/schedulers.ts

@@ -6,36 +6,12 @@
 
 // * Jolly Cobra's schedulers
 import { AnyToVoidFunction, NoneToVoidFunction } from "../types";
+import _debounce from './schedulers/debounce';
 
 //type Scheduler = typeof requestAnimationFrame | typeof onTickEnd | typeof runNow;
 
-export function debounce<F extends AnyToVoidFunction>(
-  fn: F,
-  ms: number,
-  shouldRunFirst = true,
-  shouldRunLast = true,
-) {
-  let waitingTimeout: number | null = null;
-
-  return (...args: Parameters<F>) => {
-    if(waitingTimeout) {
-      clearTimeout(waitingTimeout);
-      waitingTimeout = null;
-    } else if(shouldRunFirst) {
-      // @ts-ignore
-      fn(...args);
-    }
-
-    waitingTimeout = setTimeout(() => {
-      if(shouldRunLast) {
-        // @ts-ignore
-        fn(...args);
-      }
-
-      waitingTimeout = null;
-    }, ms) as any;
-  };
-}
+const debounce = _debounce;
+export {debounce};
 
 export function throttle<F extends AnyToVoidFunction>(
   fn: F,

src/helpers/schedulers/debounce.ts

@@ -0,0 +1,31 @@
+// * Jolly Cobra's schedulers
+
+import { AnyToVoidFunction } from "../../types";
+
+export default function debounce<F extends AnyToVoidFunction>(
+  fn: F,
+  ms: number,
+  shouldRunFirst = true,
+  shouldRunLast = true,
+) {
+  let waitingTimeout: number | null = null;
+
+  return (...args: Parameters<F>) => {
+    if(waitingTimeout) {
+      clearTimeout(waitingTimeout);
+      waitingTimeout = null;
+    } else if(shouldRunFirst) {
+      // @ts-ignore
+      fn(...args);
+    }
+
+    waitingTimeout = setTimeout(() => {
+      if(shouldRunLast) {
+        // @ts-ignore
+        fn(...args);
+      }
+
+      waitingTimeout = null;
+    }, ms) as any;
+  };
+}

src/lib/serviceWorker/stream.ts

@@ -6,88 +6,119 @@
 
 import { deferredPromise } from "../../helpers/cancellablePromise";
 import { notifySomeone } from "../../helpers/context";
+import debounce from "../../helpers/schedulers/debounce";
 import { isSafari } from "../../helpers/userAgent";
-import { UploadFile } from "../../layer";
+import { InputFileLocation, UploadFile } from "../../layer";
 import { DownloadOptions } from "../mtproto/apiFileManager";
 import { RequestFilePartTask, deferredPromises, incrementTaskId } from "./index.service";
 import timeout from "./timeout";
 
+type StreamRange = [number, number];
+type StreamId = string;
+const streams: Map<StreamId, Stream> = new Map();
+class Stream {
+  private destroyDebounced: () => void;
+  private id: StreamId;
+  private limitPart: number;
+
+  constructor(private info: DownloadOptions) {
+    this.id = Stream.getId(info);
+    streams.set(this.id, this);
+
+    // ! если грузить очень большое видео чанками по 512Кб в мобильном Safari, то стрим не запустится
+    this.limitPart = info.size > (75 * 1024 * 1024) ? STREAM_CHUNK_UPPER_LIMIT : STREAM_CHUNK_MIDDLE_LIMIT;
+    this.destroyDebounced = debounce(this.destroy, 15000, false, true);
+  }
+
+  private destroy = () => {
+    streams.delete(this.id);
+  };
+
+  private requestFilePart(alignedOffset: number, limit: number) {
+    const task: RequestFilePartTask = {
+      type: 'requestFilePart',
+      id: incrementTaskId(),
+      payload: [this.info.dcId, this.info.location, alignedOffset, limit]
+    };
+
+    notifySomeone(task);
+    
+    const deferred = deferredPromises[task.id] = deferredPromise<UploadFile.uploadFile>();
+    return deferred;
+  }
+
+  public requestRange(range: StreamRange) {
+    this.destroyDebounced();
+
+    const possibleResponse = responseForSafariFirstRange(range, this.info.mimeType, this.info.size);
+    if(possibleResponse) {
+      return possibleResponse;
+    }
+
+    const [offset, end] = range;
+
+    /* if(info.size > limitPart && isSafari && offset === limitPart) {
+      //end = info.size - 1;
+      //offset = info.size - 1 - limitPart;
+      offset = info.size - (info.size % limitPart);
+    } */
+
+    const limit = end && end < this.limitPart ? alignLimit(end - offset + 1) : this.limitPart;
+    const alignedOffset = alignOffset(offset, limit);
+
+    return this.requestFilePart(alignedOffset, limit).then(result => {
+      let ab = result.bytes as Uint8Array;
+        
+      //log.debug('[stream] requestFilePart result:', result);
+
+      const headers: Record<string, string> = {
+        'Accept-Ranges': 'bytes',
+        'Content-Range': `bytes ${alignedOffset}-${alignedOffset + ab.byteLength - 1}/${this.info.size || '*'}`,
+        'Content-Length': `${ab.byteLength}`,
+      };
+
+      if(this.info.mimeType) headers['Content-Type'] = this.info.mimeType;
+
+      if(isSafari) {
+        ab = ab.slice(offset - alignedOffset, end - alignedOffset + 1);
+        headers['Content-Range'] = `bytes ${offset}-${offset + ab.byteLength - 1}/${this.info.size || '*'}`;
+        headers['Content-Length'] = `${ab.byteLength}`;
+      }
+
+      // simulate slow connection
+      //setTimeout(() => {
+        return new Response(ab, {
+          status: 206,
+          statusText: 'Partial Content',
+          headers,
+        });
+      //}, 2.5e3);
+    });
+  }
+
+  public static get(info: DownloadOptions) {
+    return streams.get(this.getId(info)) ?? new Stream(info);
+  }
+
+  public static getId(info: DownloadOptions) {
+    return (info.location as InputFileLocation.inputDocumentFileLocation).id;
+  }
+}
+
 export default function onStreamFetch(event: FetchEvent, params: string) {
   const range = parseRange(event.request.headers.get('Range'));
-  let [offset, end] = range;
-
   const info: DownloadOptions = JSON.parse(decodeURIComponent(params));
-  //const fileName = getFileNameByLocation(info.location);
-
-  // ! если грузить очень большое видео чанками по 512Кб в мобильном Safari, то стрим не запустится
-  const limitPart = info.size > (75 * 1024 * 1024) ? STREAM_CHUNK_UPPER_LIMIT : STREAM_CHUNK_MIDDLE_LIMIT;
-
-  /* if(info.size > limitPart && isSafari && offset === limitPart) {
-    //end = info.size - 1;
-    //offset = info.size - 1 - limitPart;
-    offset = info.size - (info.size % limitPart);
-  } */
+  const stream = Stream.get(info);
 
   //log.debug('[stream]', url, offset, end);
 
   event.respondWith(Promise.race([
     timeout(45 * 1000),
-
-    new Promise<Response>((resolve, reject) => {
-      // safari workaround
-      const possibleResponse = responseForSafariFirstRange(range, info.mimeType, info.size);
-      if(possibleResponse) {
-        return resolve(possibleResponse);
-      }
-
-      const limit = end && end < limitPart ? alignLimit(end - offset + 1) : limitPart;
-      const alignedOffset = alignOffset(offset, limit);
-
-      //log.debug('[stream] requestFilePart:', /* info.dcId, info.location, */ alignedOffset, limit);
-
-      const task: RequestFilePartTask = {
-        type: 'requestFilePart',
-        id: incrementTaskId(),
-        payload: [info.dcId, info.location, alignedOffset, limit]
-      };
-
-      
-      const deferred = deferredPromises[task.id] = deferredPromise<UploadFile.uploadFile>();
-      deferred.then(result => {
-        let ab = result.bytes as Uint8Array;
-        
-        //log.debug('[stream] requestFilePart result:', result);
-
-        const headers: Record<string, string> = {
-          'Accept-Ranges': 'bytes',
-          'Content-Range': `bytes ${alignedOffset}-${alignedOffset + ab.byteLength - 1}/${info.size || '*'}`,
-          'Content-Length': `${ab.byteLength}`,
-        };
-
-        if(info.mimeType) headers['Content-Type'] = info.mimeType;
-
-        if(isSafari) {
-          ab = ab.slice(offset - alignedOffset, end - alignedOffset + 1);
-          headers['Content-Range'] = `bytes ${offset}-${offset + ab.byteLength - 1}/${info.size || '*'}`;
-          headers['Content-Length'] = `${ab.byteLength}`;
-        }
-
-        // simulate slow connection
-        //setTimeout(() => {
-          resolve(new Response(ab, {
-            status: 206,
-            statusText: 'Partial Content',
-            headers,
-          }));
-        //}, 2.5e3);
-      }).catch(err => {});
-
-      notifySomeone(task);
-    })
+    stream.requestRange(range)
   ]));
 }
 
-function responseForSafariFirstRange(range: [number, number], mimeType: string, size: number): Response {
+function responseForSafariFirstRange(range: StreamRange, mimeType: string, size: number): Response {
   if(range[0] === 0 && range[1] === 1) {
     return new Response(new Uint8Array(2).buffer, {
       status: 206,
@@ -112,7 +143,7 @@ const STREAM_CHUNK_MIDDLE_LIMIT = 512 * 1024;
 const STREAM_CHUNK_UPPER_LIMIT = 1024 * 1024;
 const SMALLEST_CHUNK_LIMIT = 512 * 4;
 
-function parseRange(header: string): [number, number] {
+function parseRange(header: string): StreamRange {
   if(!header) return [0, 0];
   const [, chunks] = header.split('=');
   const ranges = chunks.split(', ');