Daan MeijerandClaude Opus 5.5
953bbe9e39
A batch of a dense range (over ~5,400 files) exceeded Postgres' 65,535 bind parameters per statement, so its post failed with a 500 until the range was given up. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
83 lines
3.4 KiB
TypeScript
83 lines
3.4 KiB
TypeScript
import db from '@adonisjs/lucid/services/db'
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import type { QueryClientContract } from '@adonisjs/lucid/types/database'
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import { packSegments, unpackSegments, type Segment } from '#lib/nzb/segments'
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/**
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* The only code that knows how `files` keeps its segment lists (CONCEPT.md
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* D31): compressed in `files.segments`, with the first segment's message-id
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* in the indexed `first_message_id` for lookups. Read them with
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* `segmentsOf(file)`; write new files with `FileStore.insert`.
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*/
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/** A new `files` row, with its segments as a list. */
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export type NewFile = Record<string, unknown> & { segments: Segment[] }
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const unpacked = new WeakMap<object, Segment[]>()
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/** The segments of a `files` row (a row from `db.from('files')`), in order. */
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export function segmentsOf(file: { segments?: Buffer | Segment[] | null }): Segment[] {
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const { segments } = file
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if (!segments) return []
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if (Array.isArray(segments)) return segments
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let list = unpacked.get(file)
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if (!list) {
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list = unpackSegments(segments)
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unpacked.set(file, list)
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}
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return list
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}
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/** Stored form of a segment list, for the File model's column. */
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export function storedSegments(segments: Segment[]) {
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return packSegments(segments)
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}
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export function loadedSegments(stored: Buffer | null): Segment[] {
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return stored ? unpackSegments(stored) : []
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}
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/** Rows per INSERT, well below Postgres' 65,535 bind parameters. */
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export const INSERT_ROWS = 2000
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class FileStore {
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/**
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* Inserts files, skipping those whose `file_key` exists. Returns the rows
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* that were inserted (id and filename). `files` is partitioned by id
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* (CONCEPT.md D39) and each partition has its own unique file_key index:
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* keys already in any partition are looked up first; two writers adding
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* the same new key at once meet in the newest partition's index.
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*/
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async insert(files: NewFile[], client: Pick<QueryClientContract, 'knexQuery'> = db): Promise<{ id: number; filename: string }[]> {
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if (files.length === 0) return []
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const keys = [...new Set(files.map((file) => file.file_key).filter((key): key is string => typeof key === 'string'))]
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const known = new Set<string>()
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for (let i = 0; i < keys.length; i += 5000) {
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const found = await client.knexQuery().from('files').whereIn('file_key', keys.slice(i, i + 5000)).select('file_key')
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for (const row of found) known.add(row.file_key)
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}
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const seen = new Set<string>()
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const rows = files
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.filter((file) => {
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const key = file.file_key as string | null | undefined
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if (!key) return true
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if (known.has(key) || seen.has(key)) return false
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seen.add(key)
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return true
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})
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.map(({ segments, ...file }) => {
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const sorted = [...segments].sort((a, b) => a.number - b.number)
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return { ...file, segments: packSegments(sorted), first_message_id: sorted[0]?.id ?? null }
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})
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if (rows.length === 0) return []
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// A statement takes at most 65,535 parameters: ~5,400 rows of 12 columns.
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const inserted: { id: number; filename: string }[] = []
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for (let i = 0; i < rows.length; i += INSERT_ROWS) {
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const chunk = await client.knexQuery().table('files').insert(rows.slice(i, i + INSERT_ROWS)).onConflict().ignore().returning(['id', 'filename'])
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for (const row of chunk) inserted.push({ id: Number(row.id), filename: row.filename })
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}
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return inserted
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}
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}
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export default new FileStore()
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