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a tool for shared writing and social publishing
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4.3 kB · 121 lines
TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122import { randomUUID } from "node:crypto";import type { SupabaseClient } from "@supabase/supabase-js";import type { ClientStateNotFoundResponse, PullResponseOKV1, ReadonlyJSONValue,} from "replicache";import type { Database } from "supabase/database.types";import { buildExtras, buildPullResponse, parseCVRCookie, type PullFactVersion,} from "./cvr";import type { CVRStore } from "./cvrStore";
export type PullData = { clients: Record<string, number>; facts: PullFactVersion[]; publications: | { description: string; title: string; tags: string[] | null; cover_image: string | null; preferences: ReadonlyJSONValue | null; }[] | null; draft_contributors: string[] | null;};
// The whole client view comes from the pull_data_cvr stored function (see its// migration for the query): one PostgREST round trip, no pool connection, and// — because the function is a single SQL statement — one snapshot for every// read, so a mutation's lastMutationID is never visible without its fact// writes. The caller's base CVR fact versions are passed in so full fact rows// only leave the database when new or changed against that base; null// hydrates everything (the full-snapshot path).export async function fetchPullData( supabase: SupabaseClient<Database>, token_id: string, client_group_id: string, baseFactVersions: Record<string, number> | null,): Promise<PullData> { let { data, error } = await supabase.rpc("pull_data_cvr", { token_id, client_group_id, base_cvr: baseFactVersions ?? {}, }); if (error || data == null) throw error ?? new Error("pull_data_cvr returned no data"); let result = data as unknown as { client_groups: { client_id: string; last_mutation: number }[] | null; facts: | { id: string; row_version: number; fact: PullFactVersion["fact"] }[] | null; publications: PullData["publications"]; draft_contributors: string[] | null; }; let clients: Record<string, number> = {}; for (let row of result.client_groups ?? []) clients[row.client_id] = Number(row.last_mutation); return { clients, facts: (result.facts ?? []).map((row) => ({ id: row.id, row_version: Number(row.row_version), fact: row.fact ?? null, })), publications: result.publications, draft_contributors: result.draft_contributors, };}
// The full CVR pull: resolve the base CVR the cookie points at, fetch the// client view, diff, and store the advanced CVR. Cookies we can't parse// (legacy Date.now() numbers, null first pulls) and cookies whose CVR is// gone from the store both get the legacy full-snapshot response.export async function computePull( supabase: SupabaseClient<Database>, store: CVRStore, pullRequest: { cookie: unknown; clientGroupID: string }, token_id: string, now: number,): Promise<PullResponseOKV1 | ClientStateNotFoundResponse> { let cookie = parseCVRCookie(pullRequest.cookie); let storeKey = `${token_id}:${pullRequest.clientGroupID}`; try { // The base CVR must resolve before the pull query runs: the query takes // the base fact versions as an argument and only hydrates rows that // differ from them. let baseCVR = cookie ? await store.get(storeKey, cookie.cvrID) : null; let data = await fetchPullData( supabase, token_id, pullRequest.clientGroupID, baseCVR?.f ?? null, ); let nextCVRID = randomUUID(); let { response, nextCVR } = buildPullResponse({ prevCookie: pullRequest.cookie, baseCVR, nextCVRID, facts: data.facts, extras: buildExtras(data.publications, data.draft_contributors), clients: data.clients, now, }); if (nextCVR) await store.set(storeKey, { id: nextCVRID, ...nextCVR }); return response; } catch (e) { // The legacy handler returned ClientStateNotFound whenever the pull_data // RPC errored (e.g. a malformed token id); Replicache then resets the // client, which also cleanly recovers the (structurally impossible) // unhydrated-changed-fact error from buildPullResponse. Preserve that // rather than surfacing a 500 the puller would hand to Replicache as a // garbage response. console.log(e); return { error: "ClientStateNotFound" }; }}