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import { Barcode } from "./barcode";
import { BrowserHelper } from "./browserHelper";
import { EngineLoader } from "./engineLoader";
import { ScanSettings } from "./scanSettings";
import { EngineSentMessageData, EngineWorker, engineWorkerBlob } from "./workers/engineWorker";
type EventName = "blurryTablesUpdate";
class BlurryRecognitionPreloaderEventEmitter extends EventEmitter<EventName> {}
export class BlurryRecognitionPreloader {
private static readonly writableDataPath: string = "/scandit_sync_folder_preload";
private static readonly fsObjectStoreName: string = "FILE_DATA";
// From AndroidLowEnd
private static readonly blurryTableFiles: string[] = [
"/0ae170296d3653ad308e7fa192d42fb6.scandit", // ean13, ean8, upca, upce
"/1a3f08f42d1332344e3cebb5c53d9837.scandit", // code39
"/32e564a3408a1555c8e1c437fee00d36.scandit", // code39
"/3d90c055e483d26cc356c4a9e1b1fb37.scandit", // code39
"/4243724f7555e82c259850107c30914f.scandit", // itf
"/58c55d55c191d83754ff25398170a396.scandit", // code128
"/59a53ea1435408779834719fa6c2cabd.scandit", // msi-plessey
"/59c85c98c5674dd1072254ea6bd6ef92.scandit", // itf
"/5f91576bc7215e09de2c145cccca50de.scandit", // code93
"/6fa564c6d98a4cf360aead27987f9546.scandit", // msi-plessey
"/76ca9155b19b81b4ea4a209c9c2154a4.scandit", // itf
"/89dfec6b19b94e2bd9459388c7d2fefb.scandit", // ean13, ean8, upca, upce
"/98908cb667cf64cf863486b6a7aafe8b.scandit", // code128
"/cd5894907b6dd4d3ab237f353db43625.scandit", // msi-plessey
"/e078b48a2b083e551246567e8cdf1b9c.scandit", // code93
"/e171da0d56d58dc63b105a2f4dc5dce0.scandit", // code128
"/e4d5141cd8ed672df64dca4f0bd1709e.scandit", // ean13, ean8, upca, upce
"/eadf9b9d40ca243665e4ee7cbd7ba109.scandit", // code93
].map((path) => {
return `${BlurryRecognitionPreloader.writableDataPath}${path}`;
});
private static readonly availableBlurryRecognitionSymbologies: Set<Barcode.Symbology> = new Set([
Barcode.Symbology.EAN13, // Shared with UPCA
Barcode.Symbology.EAN8,
Barcode.Symbology.CODE39,
Barcode.Symbology.CODE128,
Barcode.Symbology.CODE93,
Barcode.Symbology.INTERLEAVED_2_OF_5,
Barcode.Symbology.MSI_PLESSEY,
Barcode.Symbology.UPCA, // Shared with EAN13
Barcode.Symbology.UPCE,
]);
private readonly eventEmitter: BlurryRecognitionPreloaderEventEmitter = new EventEmitter();
private readonly preload: boolean;
private queuedBlurryRecognitionSymbologies: Barcode.Symbology[] = Array.from(
BlurryRecognitionPreloader.availableBlurryRecognitionSymbologies.values()
);
private readyBlurryRecognitionSymbologies: Set<Barcode.Symbology> = new Set();
private engineWorker: EngineWorker;
private constructor(preload: boolean) {
this.preload = preload;
}
public static create(preload: boolean): Promise<BlurryRecognitionPreloader> {
if (preload) {
// Edge currently doesn't support IndexedDB in blob Web Workers so data wouldn't be persisted,
// hence it would be useless to preload blurry recognition as data couldn't be saved.
const browserName: string | undefined = BrowserHelper.userAgentInfo.getBrowser().name;
if (browserName != null && browserName.includes("Edge")) {
const worker: Worker = new Worker(
URL.createObjectURL(
new Blob([`(${BlurryRecognitionPreloader.workerIndexedDBSupportTestFunction.toString()})()`], {
type: "text/javascript",
})
)
);
return new Promise((resolve) => {
worker.onmessage = (message) => {
worker.terminate();
resolve(new BlurryRecognitionPreloader(message.data));
};
});
}
}
return Promise.resolve(new BlurryRecognitionPreloader(preload));
}
// istanbul ignore next
private static workerIndexedDBSupportTestFunction(): void {
try {
indexedDB.deleteDatabase("scandit_indexeddb_support_test");
// @ts-ignore
postMessage(true);
} catch (error) {
// @ts-ignore
postMessage(false);
}
}
public prepareBlurryTables(): void {
(this.preload ? this.checkBlurryTablesAlreadyAvailable() : Promise.resolve(true))
.then((alreadyAvailable) => {
if (alreadyAvailable) {
this.queuedBlurryRecognitionSymbologies = [];
this.readyBlurryRecognitionSymbologies = new Set(
BlurryRecognitionPreloader.availableBlurryRecognitionSymbologies
);
this.eventEmitter.emit("blurryTablesUpdate", new Set(this.readyBlurryRecognitionSymbologies));
} else {
this.engineWorker = new Worker(URL.createObjectURL(engineWorkerBlob));
this.engineWorker.onmessage = this.engineWorkerOnMessage.bind(this);
EngineLoader.load(this.engineWorker, true, true);
}
})
.catch(console.error);
}
public on(eventName: EventName, listener: ListenerFn): void {
// istanbul ignore else
if (eventName === "blurryTablesUpdate") {
if (
this.readyBlurryRecognitionSymbologies.size ===
BlurryRecognitionPreloader.availableBlurryRecognitionSymbologies.size
) {
listener(this.readyBlurryRecognitionSymbologies);
} else {
this.eventEmitter.on(eventName, listener);
}
}
}
public updateBlurryRecognitionPriority(scanSettings: ScanSettings): void {
const newQueuedBlurryRecognitionSymbologies: Barcode.Symbology[] = this.queuedBlurryRecognitionSymbologies.slice();
this.getEnabledSymbologies(scanSettings).forEach((symbology) => {
const symbologyQueuePosition: number = newQueuedBlurryRecognitionSymbologies.indexOf(symbology);
if (symbologyQueuePosition !== -1) {
newQueuedBlurryRecognitionSymbologies.unshift(
newQueuedBlurryRecognitionSymbologies.splice(symbologyQueuePosition, 1)[0]
);
}
});
this.queuedBlurryRecognitionSymbologies = newQueuedBlurryRecognitionSymbologies;
}
public isBlurryRecognitionAvailable(scanSettings: ScanSettings): boolean {
const enabledBlurryRecognitionSymbologies: Barcode.Symbology[] = this.getEnabledSymbologies(scanSettings);
return enabledBlurryRecognitionSymbologies.every((symbology) => {
return this.readyBlurryRecognitionSymbologies.has(symbology);
});
}
public getEnabledSymbologies(scanSettings: ScanSettings): Barcode.Symbology[] {
return Array.from(BlurryRecognitionPreloader.availableBlurryRecognitionSymbologies.values()).filter((symbology) => {
return scanSettings.isSymbologyEnabled(symbology);
});
}
private createNextBlurryTableSymbology(): void {
let symbology: Barcode.Symbology | undefined;
do {
symbology = this.queuedBlurryRecognitionSymbologies.shift();
} while (symbology != null && this.readyBlurryRecognitionSymbologies.has(symbology));
// istanbul ignore else
if (symbology != null) {
this.engineWorker.postMessage({
type: "create-blurry-table",
symbology,
});
}
}
private checkBlurryTablesAlreadyAvailable(): Promise<boolean> {
return new Promise((resolve) => {
const openDbRequest: IDBOpenDBRequest = indexedDB.open(BlurryRecognitionPreloader.writableDataPath);
function handleErrorOrNew(this: IDBOpenDBRequest | IDBTransaction | IDBRequest | { error: Error }): void {
openDbRequest?.result?.close();
// this.error
resolve(false);
}
openDbRequest.onupgradeneeded = () => {
try {
openDbRequest.result.createObjectStore(BlurryRecognitionPreloader.fsObjectStoreName);
} catch (error) {
// Ignored
}
};
openDbRequest.onsuccess = () => {
try {
const transaction: IDBTransaction = openDbRequest.result.transaction(
BlurryRecognitionPreloader.fsObjectStoreName,
"readonly"
);
transaction.onerror = handleErrorOrNew;
const storeKeysRequest: IDBRequest<IDBValidKey[]> = transaction
.objectStore(BlurryRecognitionPreloader.fsObjectStoreName)
.getAllKeys();
storeKeysRequest.onsuccess = () => {
openDbRequest.result.close();
if (
BlurryRecognitionPreloader.blurryTableFiles.every((file) => {
return storeKeysRequest.result.indexOf(file) !== -1;
})
) {
return resolve(true);
} else {
return resolve(false);
}
};
storeKeysRequest.onerror = handleErrorOrNew;
} catch (error) {
handleErrorOrNew.call({ error });
}
};
openDbRequest.onblocked = openDbRequest.onerror = handleErrorOrNew;
});
}
private engineWorkerOnMessage(ev: MessageEvent): void {
const data: EngineSentMessageData = ev.data;
// istanbul ignore else
if (data[1] != null) {
switch (data[0]) {
case "license-key-features":
this.createNextBlurryTableSymbology();
break;
case "create-blurry-table-result":
this.readyBlurryRecognitionSymbologies.add(data[1]);
if (data[1] === Barcode.Symbology.EAN13) {
this.readyBlurryRecognitionSymbologies.add(Barcode.Symbology.UPCA);
} else if (data[1] === Barcode.Symbology.UPCA) {
this.readyBlurryRecognitionSymbologies.add(Barcode.Symbology.EAN13);
}
this.eventEmitter.emit("blurryTablesUpdate", new Set(this.readyBlurryRecognitionSymbologies));
if (
this.readyBlurryRecognitionSymbologies.size ===
BlurryRecognitionPreloader.availableBlurryRecognitionSymbologies.size
) {
this.engineWorker.terminate();
} else {
this.createNextBlurryTableSymbology();
}
break;
// istanbul ignore next
default:
break;
}
}
}
}
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