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Devin Zuczek
28 lines
1.2 KiB
TypeScript
28 lines
1.2 KiB
TypeScript
/**
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* D1 caps a prepared statement at 100 bound parameters — binding more fails outright with
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* "variable number must be between ?1 and ?100". Every `IN (…)` list built from a caller's
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* array has to respect this, which is easy to miss: the id list behind a bulk lookup (a
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* friends list, a room's subrooms) stays under a hundred right up until it meets a real
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* account, and then the whole endpoint 500s rather than degrading.
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*/
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export const MAX_BOUND_PARAMS = 100
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/**
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* Split values into chunks that fit {@link MAX_BOUND_PARAMS}, one statement each. `reserve`
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* is how many binds the statement spends on something other than the list — a `now` cutoff,
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* a player id — which come out of the same budget.
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*/
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export function chunkForBinds<T>(values: T[], reserve = 0): T[][] {
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const perChunk = MAX_BOUND_PARAMS - reserve
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const chunks: T[][] = []
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for (let i = 0; i < values.length; i += perChunk) {
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chunks.push(values.slice(i, i + perChunk))
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}
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return chunks
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}
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/** The `?1,?2,…` placeholder list for one chunk, offset past any binds reserved ahead of it. */
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export function bindPlaceholders(chunk: unknown[], offset = 0): string {
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return chunk.map((_, i) => `?${i + 1 + offset}`).join(', ')
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}
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