Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.
| Fast pages, required checks on the branch, self-hosted runners, honest incidents | 1 | /** |
| 2 | * Reading a service's D1 database near the caller with D1's Sessions API, | |
| 3 | * and saying how long an RPC took: the TypeScript side of | |
| 4 | * crates/kit/src/d1.rs, with the same rules. | |
| 5 | * | |
| 6 | * The caller chooses, per request, with the `x-d1-bookmark` header: | |
| 7 | * | |
| 8 | * | Header | Reads go to | | |
| 9 | * | --- | --- | | |
| 10 | * | absent | the primary, with no session (as always) | | |
| 11 | * | `first-primary` | the primary first, then any copy at least as new | | |
| 12 | * | `first-unconstrained` | the nearest copy | | |
| 13 | * | a bookmark | any copy at least as new as the bookmark | | |
| 14 | * | |
| 15 | * Writes always go to the primary. The session's latest bookmark comes | |
| The docs folder is gone, and what it held lives where people read it: how a self-hosted g1t runs and how to deploy g1t to Cloudflare are pages on docs.g1t.sh under Run g1t yourself, and speed, rate limits and operating g1t.sh are sections of CONTRIBUTING.md; code that cited a file in docs/ now points to the page or section that covers it, or says what it means itself, and applied migrations and the runner images are left as they were. | 16 | * back in the response's `x-d1-bookmark`. The site's side is |
| 17 | * apps/web/app/lib/perf.ts. | |
| Fast pages, required checks on the branch, self-hosted runners, honest incidents | 18 | */ |
| 19 | ||
| 20 | /** The header that carries a session's constraint or bookmark, both ways. */ | |
| 21 | export const BOOKMARK_HEADER = "x-d1-bookmark"; | |
| 22 | ||
| 23 | const MAX_BOOKMARK = 256; | |
| 24 | ||
| 25 | /** | |
| 26 | * What an `x-d1-bookmark` header asks for: null for no session, otherwise | |
| 27 | * what `withSession` is given. Anything malformed starts on the primary. | |
| 28 | */ | |
| 29 | export function sessionConstraint(header: string | null | undefined): string | null { | |
| 30 | const value = header?.trim(); | |
| 31 | if (!value) return null; | |
| 32 | if (value === "first-primary" || value === "first-unconstrained") return value; | |
| 33 | return value.length <= MAX_BOOKMARK && /^[0-9A-Za-z-]+$/.test(value) ? value : "first-primary"; | |
| 34 | } | |
| 35 | ||
| 36 | /** A D1 binding, as far as sessions need it. */ | |
| 37 | type SessionCapable = { withSession(constraintOrBookmark?: string): { getBookmark(): string | null } }; | |
| 38 | ||
| A doc opens at once: the page carries the document's saved state, so the editor mounts without waiting for its live room, which connects in the background and sends only what changed, with a quiet dot that turns green when it's synced; edits made before then are kept and sent once. The editor's code is preloaded from the page and fetched early when you hover a doc, the app's shared code ships in a few chunks instead of a hundred small ones, socket tickets come with the page instead of a round trip, and the artifacts service answers a page, a sidebar and a room in parallel lookups instead of a dozen in a row, reporting its database round trips in Server-Timing. The artifacts guide says how a doc opens, and CONTRIBUTING's Speed section has the numbers. | 39 | /** How long a request waited on D1, and in how many round trips. */ |
| 40 | export type D1Timing = { trips: number; ms: number }; | |
| 41 | ||
| 42 | /** The methods of a prepared statement that go to the database. */ | |
| 43 | const TRIPS = new Set(["all", "first", "run", "raw"]); | |
| 44 | ||
| 45 | /** | |
| 46 | * `db` with every round trip counted into `timing`: each `all`, `first`, | |
| 47 | * `run` and `raw` of a statement, and each `batch`. Statements given to | |
| 48 | * `batch` are unwrapped, so the binding sees its own. The `db;dur` metric | |
| 49 | * crates/kit/src/d1.rs reports for the Rust services, for the TypeScript | |
| 50 | * ones; the site reads both (apps/web/app/lib/perf.ts `databaseTime`). | |
| 51 | */ | |
| 52 | export function timedD1<D extends object>(db: D, timing: D1Timing): D { | |
| 53 | const raw = new WeakMap<object, object>(); | |
| 54 | const trip = async <T>(work: () => Promise<T>): Promise<T> => { | |
| 55 | const from = Date.now(); | |
| 56 | try { | |
| 57 | return await work(); | |
| 58 | } finally { | |
| 59 | timing.trips += 1; | |
| 60 | timing.ms += Date.now() - from; | |
| 61 | } | |
| 62 | }; | |
| 63 | const statement = (s: object): object => { | |
| 64 | const wrapped = new Proxy(s, { | |
| 65 | get(target, prop) { | |
| 66 | const value = Reflect.get(target, prop, target); | |
| 67 | if (typeof value !== "function") return value; | |
| 68 | if (prop === "bind") return (...args: unknown[]) => statement(value.apply(target, args)); | |
| 69 | if (typeof prop === "string" && TRIPS.has(prop)) return (...args: unknown[]) => trip(() => value.apply(target, args)); | |
| 70 | return value.bind(target); | |
| 71 | }, | |
| 72 | }); | |
| 73 | raw.set(wrapped, s); | |
| 74 | return wrapped; | |
| 75 | }; | |
| 76 | return new Proxy(db, { | |
| 77 | get(target, prop) { | |
| 78 | const value = Reflect.get(target, prop, target); | |
| 79 | if (typeof value !== "function") return value; | |
| 80 | if (prop === "prepare") return (query: string) => statement(value.call(target, query)); | |
| 81 | if (prop === "batch") return (statements: object[]) => trip(() => value.call(target, statements.map((s) => raw.get(s) ?? s))); | |
| 82 | return value.bind(target); | |
| 83 | }, | |
| 84 | }); | |
| 85 | } | |
| 86 | ||
| Fast pages, required checks on the branch, self-hosted runners, honest incidents | 87 | /** |
| 88 | * The database for an RPC `request`: a session, seen as the binding, when | |
| 89 | * the caller asked for one (it answers `prepare` and `batch`, all a request | |
| A doc opens at once: the page carries the document's saved state, so the editor mounts without waiting for its live room, which connects in the background and sends only what changed, with a quiet dot that turns green when it's synced; edits made before then are kept and sent once. The editor's code is preloaded from the page and fetched early when you hover a doc, the app's shared code ships in a few chunks instead of a hundred small ones, socket tickets come with the page instead of a round trip, and the artifacts service answers a page, a sidebar and a room in parallel lookups instead of a dozen in a row, reporting its database round trips in Server-Timing. The artifacts guide says how a doc opens, and CONTRIBUTING's Speed section has the numbers. | 90 | * path uses), the binding itself otherwise, with its round trips counted. |
| 91 | * `finish` adds the bookmark, the time taken and the database time to the | |
| 92 | * answer. | |
| Fast pages, required checks on the branch, self-hosted runners, honest incidents | 93 | */ |
| A doc opens at once: the page carries the document's saved state, so the editor mounts without waiting for its live room, which connects in the background and sends only what changed, with a quiet dot that turns green when it's synced; edits made before then are kept and sent once. The editor's code is preloaded from the page and fetched early when you hover a doc, the app's shared code ships in a few chunks instead of a hundred small ones, socket tickets come with the page instead of a round trip, and the artifacts service answers a page, a sidebar and a room in parallel lookups instead of a dozen in a row, reporting its database round trips in Server-Timing. The artifacts guide says how a doc opens, and CONTRIBUTING's Speed section has the numbers. | 94 | export function openD1<D extends SessionCapable>(db: D, request: Request): { db: D; timing: D1Timing; finish(response: Response): Response } { |
| Fast pages, required checks on the branch, self-hosted runners, honest incidents | 95 | const started = Date.now(); |
| 96 | const asked = sessionConstraint(request.headers.get(BOOKMARK_HEADER)); | |
| 97 | const session = asked ? db.withSession(asked) : null; | |
| A doc opens at once: the page carries the document's saved state, so the editor mounts without waiting for its live room, which connects in the background and sends only what changed, with a quiet dot that turns green when it's synced; edits made before then are kept and sent once. The editor's code is preloaded from the page and fetched early when you hover a doc, the app's shared code ships in a few chunks instead of a hundred small ones, socket tickets come with the page instead of a round trip, and the artifacts service answers a page, a sidebar and a room in parallel lookups instead of a dozen in a row, reporting its database round trips in Server-Timing. The artifacts guide says how a doc opens, and CONTRIBUTING's Speed section has the numbers. | 98 | const timing: D1Timing = { trips: 0, ms: 0 }; |
| Fast pages, required checks on the branch, self-hosted runners, honest incidents | 99 | return { |
| A doc opens at once: the page carries the document's saved state, so the editor mounts without waiting for its live room, which connects in the background and sends only what changed, with a quiet dot that turns green when it's synced; edits made before then are kept and sent once. The editor's code is preloaded from the page and fetched early when you hover a doc, the app's shared code ships in a few chunks instead of a hundred small ones, socket tickets come with the page instead of a round trip, and the artifacts service answers a page, a sidebar and a room in parallel lookups instead of a dozen in a row, reporting its database round trips in Server-Timing. The artifacts guide says how a doc opens, and CONTRIBUTING's Speed section has the numbers. | 100 | db: timedD1((session ?? db) as D, timing), |
| 101 | timing, | |
| Fast pages, required checks on the branch, self-hosted runners, honest incidents | 102 | finish(response) { |
| 103 | const answered = new Response(response.body, response); | |
| A doc opens at once: the page carries the document's saved state, so the editor mounts without waiting for its live room, which connects in the background and sends only what changed, with a quiet dot that turns green when it's synced; edits made before then are kept and sent once. The editor's code is preloaded from the page and fetched early when you hover a doc, the app's shared code ships in a few chunks instead of a hundred small ones, socket tickets come with the page instead of a round trip, and the artifacts service answers a page, a sidebar and a room in parallel lookups instead of a dozen in a row, reporting its database round trips in Server-Timing. The artifacts guide says how a doc opens, and CONTRIBUTING's Speed section has the numbers. | 104 | const db = timing.trips ? `, db;dur=${timing.ms};desc="${timing.trips} round trip${timing.trips === 1 ? "" : "s"}"` : ""; |
| 105 | answered.headers.append("server-timing", `svc;dur=${Date.now() - started};desc="${session ? "session" : "primary"}"${db}`); | |
| Fast pages, required checks on the branch, self-hosted runners, honest incidents | 106 | const bookmark = session?.getBookmark(); |
| 107 | if (bookmark) answered.headers.set(BOOKMARK_HEADER, bookmark); | |
| 108 | return answered; | |
| 109 | }, | |
| 110 | }; | |
| 111 | } |
