gristlabs_grist-core/app/client/ui/HomeImports.ts

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import {guessTimezone} from 'app/client/lib/guessTimezone';
import {IMPORTABLE_EXTENSIONS, uploadFiles} from 'app/client/lib/uploads';
import {AppModel, reportError} from 'app/client/models/AppModel';
import {IProgress} from 'app/client/models/NotifyModel';
import {openFilePicker} from 'app/client/ui/FileDialog';
import {byteString} from 'app/common/gutil';
import {Disposable} from 'grainjs';
/**
* Imports a document and returns its docId, or null if no files were selected.
*/
export async function docImport(app: AppModel, workspaceId: number|"unsaved"): Promise<string|null> {
// We use openFilePicker() and uploadFiles() separately, rather than the selectFiles() helper,
// because we only want to connect to a docWorker if there are in fact any files to upload.
// Start selecting files. This needs to start synchronously to be seen as a user-initiated
// popup, or it would get blocked by default in a typical browser.
const files: File[] = await openFilePicker({
multiple: false,
accept: IMPORTABLE_EXTENSIONS.join(","),
});
if (!files.length) { return null; }
// There is just one file (thanks to {multiple: false} above).
const progressUI = app.notifier.createProgressIndicator(files[0].name, byteString(files[0].size));
const progress = ImportProgress.create(progressUI, progressUI, files[0]);
try {
const timezone = await guessTimezone();
if (workspaceId === "unsaved") {
function onUploadProgress(ev: ProgressEvent) {
if (ev.lengthComputable) {
progress.setUploadProgress(ev.loaded / ev.total * 100); // percentage complete
}
}
return await app.api.importUnsavedDoc(files[0], {timezone, onUploadProgress});
} else {
// Connect to a docworker. Imports share some properties of documents but not all. In place of
// docId, for the purposes of work allocation, we use the special assigmentId `import`.
const docWorker = await app.api.getWorkerAPI('import');
// This uploads to the docWorkerUrl saved in window.gristConfig
const uploadResult = await uploadFiles(files, {docWorkerUrl: docWorker.url, sizeLimit: 'import'},
(p) => progress.setUploadProgress(p));
const importResult = await docWorker.importDocToWorkspace(uploadResult!.uploadId, workspaceId, {timezone});
return importResult.id;
}
} catch (err) {
reportError(err);
return null;
} finally {
progress.finish();
// Dispose the indicator UI and the progress timer owned by it.
progressUI.dispose();
}
}
export class ImportProgress extends Disposable {
// Import does upload first, then import. We show a single indicator, estimating which fraction
// of the time should be given to upload (whose progress we can report well), and which to the
// subsequent import (whose progress indicator is mostly faked).
private _uploadFraction: number;
private _estImportSeconds: number;
private _importTimer: null | ReturnType<typeof setInterval> = null;
private _importStart: number = 0;
constructor(private _progressUI: IProgress, file: File) {
super();
// We'll assume that for .grist files, the upload takes 90% of the total time, and for other
// files, 40%.
this._uploadFraction = file.name.endsWith(".grist") ? 0.9 : 0.4;
// TODO: Import step should include a progress callback, to be combined with upload progress.
// Without it, we estimate import to take 2s per MB (non-scientific unreliable estimate), and
// use an asymptotic indicator which keeps moving without ever finishing. Not terribly useful,
// but does slow down for larger files, and is more comforting than a stuck indicator.
this._estImportSeconds = file.size / 1024 / 1024 * 2;
this._progressUI.setProgress(0);
this.onDispose(() => this._importTimer && clearInterval(this._importTimer));
}
// Once this reaches 100, the import stage begins.
public setUploadProgress(percentage: number) {
this._progressUI.setProgress(percentage * this._uploadFraction);
if (percentage >= 100 && !this._importTimer) {
this._importStart = Date.now();
this._importTimer = setInterval(() => this._onImportTimer(), 100);
}
}
public finish() {
if (this._importTimer) {
clearInterval(this._importTimer);
}
this._progressUI.setProgress(100);
}
/**
* Calls _progressUI.setProgress(percent) with percentage increasing from 0 and asymptotically
* approaching 100, reaching 50% after estSeconds. It's intended to look reasonable when the
* estimate is good, and to keep showing slowing progress even if it's not.
*/
private _onImportTimer() {
const elapsedSeconds = (Date.now() - this._importStart) / 1000;
const importProgress = elapsedSeconds / (elapsedSeconds + this._estImportSeconds);
const progress = this._uploadFraction + importProgress * (1 - this._uploadFraction);
this._progressUI.setProgress(100 * progress);
}
}