65 lines
1.7 KiB
TypeScript
65 lines
1.7 KiB
TypeScript
import type { Dlr } from './dlr.ts';
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export type MessageDlr = Dlr & { segments: Dlr[] };
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type Group = {
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expected: number;
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parts: Map<number, Dlr>;
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};
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const numbered = /^(.*)-(\d+)$/;
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/**
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* Merges the per-segment receipts of a multipart message into one report, but only when the peer
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* numbered its ids `<base>-<n>` off one base — the convention this library's own server follows. An
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* SMSC that hands out unrelated ids per segment cannot be merged, so nothing is reported for it.
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*/
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export class DlrMerger {
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private readonly groups = new Map<string, Group>();
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/** Registers the ids one multipart send got back, so their receipts can be merged. */
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expect(smsIds: string[]): void {
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if (smsIds.length < 2) return;
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const bases = new Set<string>();
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for (const smsId of smsIds) {
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const base = numbered.exec(smsId)?.[1];
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if (base === undefined || base === '') return;
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bases.add(base);
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}
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if (bases.size !== 1) return;
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for (const base of bases) {
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this.groups.set(base, { expected: smsIds.length, parts: new Map() });
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}
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}
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/** The whole message's report, on the receipt that completes it. */
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collect(dlr: Dlr): MessageDlr | undefined {
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const match = numbered.exec(dlr.smsId);
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const base = match?.[1];
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const part = match?.[2];
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if (base === undefined || part === undefined) return undefined;
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const group = this.groups.get(base);
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if (!group) return undefined;
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group.parts.set(Number(part), dlr);
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if (group.parts.size < group.expected) return undefined;
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this.groups.delete(base);
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const segments = [...group.parts.entries()].sort(([a], [b]) => a - b).map(([, one]) => one);
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const worst = segments.reduce((carry, one) => (one.statusId > carry.statusId ? one : carry));
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return { ...worst, segments, smsId: base };
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}
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}
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