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66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
"use strict";
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const dateFns = require("date-fns");
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const pipe = require("@promistream/pipe");
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const combineSequentialStreaming = require("@promistream/combine-sequential-streaming");
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const fromIterable = require("@promistream/from-iterable");
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const fromNodeStream = require("@promistream/from-node-stream");
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const createTypeTaggingStream = require("./streams/tag-type");
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module.exports = function ({ db, knex }) {
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return function (tx, { timestamp, prefix }) {
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// NOTE: This returns snake_cased keys! As we're bypassing the Objection internals, no casemapping occurs.
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// FIXME/REFACTOR: That needs to be changed in the refactor, for consistency across database backends
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// NOTE: This is a hacky workaround - if we don't do this, then for some reason also entries *at* the exact timestamp are included, which is not what we want.
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// FIXME: Verify that this doesn't break anything, eg. when an entry is created inbetween the original timestamp and +1ms.
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let actualTimestamp = (timestamp != null)
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? dateFns.addMilliseconds(timestamp, 1)
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: undefined;
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function applyWhereClauses(query, idField) {
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if (timestamp != null) {
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// FIXME: An error in the query here throws an error, resulting in an abort handling bug in a promistream
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query = query.whereRaw(`updated_at > ?`, [ actualTimestamp ]);
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}
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if (prefix != null) {
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query = query.whereRaw(`${idField} LIKE ?`, [ `${prefix.replace(/%/g, "\\%")}%` ]);
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}
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return query;
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}
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function* streamGenerator() {
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yield pipe([
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fromNodeStream.fromReadable(
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applyWhereClauses(db.Item.query(tx), "id").toKnexQuery().stream()
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),
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createTypeTaggingStream("item")
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]);
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yield pipe([
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fromNodeStream.fromReadable(
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// NOTE: We are only interested in aliases which don't point at themselves
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applyWhereClauses(db.Alias.query(tx).where("alias", "!=", knex.ref("item_id")), "alias").toKnexQuery().stream()
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),
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createTypeTaggingStream("alias")
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]);
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yield pipe([
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fromNodeStream.fromReadable(
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applyWhereClauses(db.TaskResult.query(tx), "item_id").toKnexQuery().stream()
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),
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createTypeTaggingStream("taskResult")
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]);
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}
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return pipe([
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fromIterable(streamGenerator()),
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combineSequentialStreaming()
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]);
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}
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};
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