70 lines
2.1 KiB
TypeScript
70 lines
2.1 KiB
TypeScript
import { FileMeta } from "../types.ts";
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import type { SpacePrimitives } from "./space_primitives.ts";
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/**
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* FallbackSpacePrimitives is a SpacePrimitives implementation that will try to fall back to another SpacePrimitives implementation for two
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* operations:
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* - readFile
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* - getFileMeta
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* The use case is primarily sync: when sync hasn't completed yet, we can fall back to HttpSpacePrimitives to fetch the file from the server.
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*/
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export class FallbackSpacePrimitives implements SpacePrimitives {
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constructor(
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private primary: SpacePrimitives,
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private fallback: SpacePrimitives,
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) {
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}
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fetchFileList(): Promise<FileMeta[]> {
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return this.primary.fetchFileList();
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}
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async readFile(name: string): Promise<{ data: Uint8Array; meta: FileMeta }> {
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try {
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return await this.primary.readFile(name);
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} catch (e) {
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console.info(
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`Could not read file ${name} from primary, trying fallback, primary read error:`,
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e.message,
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);
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try {
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return await this.fallback.readFile(name);
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} catch (fallbackError: any) {
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console.error("Error during readFile fallback", fallbackError.message);
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// Fallback failed, so let's throw the original error
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throw e;
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}
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}
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}
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async getFileMeta(name: string): Promise<FileMeta> {
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try {
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return await this.primary.getFileMeta(name);
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} catch (e) {
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console.info(
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`Could not fetch file ${name} metadata from primary, trying fallback, primary read error`,
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e.message,
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);
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try {
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return await this.fallback.getFileMeta(name);
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} catch (fallbackError) {
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console.error(
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"Error during getFileMeta fallback",
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fallbackError.message,
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);
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// Fallback failed, so let's throw the original error
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throw e;
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}
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}
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}
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writeFile(
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name: string,
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data: Uint8Array,
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selfUpdate?: boolean | undefined,
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meta?: FileMeta,
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): Promise<FileMeta> {
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return this.primary.writeFile(name, data, selfUpdate, meta);
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}
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deleteFile(name: string): Promise<void> {
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return this.primary.deleteFile(name);
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}
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}
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