Summary: Adds a new implementation of the interface ExternalStorage that works for Azure Blob Storage as an alternative to S3, for a specific self-hosting case. Tweaks HostedStorageManager and ICreate to allow configuring different core implementations of ExternalStorage. Followup tasks: - Make this code available to self hosters, possibly by making it open source. - Add an env var or other config option to specify the preferred type of storage. Currently using the var `AZURE_STORAGE_CONNECTION_STRING` to know how to connect to Azure when requested, but that choice still only lives in test code. Test Plan: Generalized HostedStorageManager and ExternalStorage tests to test the new AzureExternalStorage alongside S3ExternalStorage. The HostedStorageManager tests also now test the 'cached' in-memory test storage in a way that's closer to the real storage methods. Reviewers: paulfitz Reviewed By: paulfitz Differential Revision: https://phab.getgrist.com/D3413pull/203/head
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/**
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* Just some basic utilities for async generators that should really be part of the language or lodash or something.
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*/
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export async function* asyncFilter<T>(it: AsyncIterableIterator<T>, pred: (x: T) => boolean): AsyncIterableIterator<T> {
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for await (const x of it) {
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if (pred(x)) {
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yield x;
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}
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}
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}
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export async function* asyncMap<T, R>(it: AsyncIterableIterator<T>, mapper: (x: T) => R): AsyncIterableIterator<R> {
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for await (const x of it) {
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yield mapper(x);
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}
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}
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export async function toArray<T>(it: AsyncIterableIterator<T>): Promise<T[]> {
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const result = [];
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for await (const x of it) {
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result.push(x);
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}
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return result;
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}
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