openvibe-sdk/events

type EventInput

What a producer passes: event_id, timestamp, source, version, payload and trace_id are filled in.

export type EventInput = Omit<EventEnvelope, 'event_id' | 'timestamp' | 'source' | 'version' | 'payload'> & Partial<Pick<EventEnvelope, 'event_id' | 'timestamp' | 'source' | 'version' | 'payload'>>;

interface PublishResult

export interface PublishResult { event_id: string; seq: number; duplicate: boolean; }

interface StoredEvent

export interface StoredEvent { seq: number; event: EventEnvelope; }

interface Gap

export interface Gap { from_seq: number; to_seq: number; reason?: string; latest_seq?: number; }

interface EventsPage

export interface EventsPage { events: StoredEvent[]; next_after_seq: number; latest_seq: number; gap?: Gap; }

interface Subscription

export interface Subscription {
    id: string;
    consumer: string;
    topic_pattern: string;
    endpoint: string;
    enabled: boolean;
    retry_policy: { max_attempts?: number; backoff_ms?: number[] } | null;
    /** Only in the create response. */
    secret?: string;
    [field: string]: unknown;
}

interface CreateSubscription

export interface CreateSubscription { topicPattern: string; endpoint: string; secret?: string; retryPolicy?: { max_attempts?: number; backoff_ms?: number[] }; }

interface EventsClient

export interface EventsClient {
    prepare(envelope: EventInput, opts?: { traceId?: string; now?: number }): EventEnvelope;
    publish(envelope: EventInput, opts?: { traceparent?: string }): Promise<PublishResult>;
    publish(envelopes: EventInput[], opts?: { traceparent?: string }): Promise<{ results: PublishResult[] }>;
    pull(opts?: { topic?: string | string[]; afterSeq?: number; limit?: number }): Promise<EventsPage>;
    /** onPage runs after every item of that page was yielded and handled: save page.next_after_seq there. */
    iterate(opts?: { topic?: string | string[]; afterSeq?: number; limit?: number; maxPages?: number; onGap?: (gap: Gap) => void | Promise<void>; onPage?: (page: EventsPage) => void | Promise<void> }): AsyncGenerator<StoredEvent, void, unknown>;
    get(eventId: string): Promise<StoredEvent | null>;
    getCheckpoint(topic: string): Promise<{ consumer: string; topic: string; cursor: number; updated_at: string | null }>;
    setCheckpoint(topic: string, cursor: number): Promise<{ consumer: string; topic: string; cursor: number }>;
    subscriptions: {
        create(input: CreateSubscription): Promise<Subscription>;
        list(): Promise<Subscription[]>;
        get(id: string): Promise<Subscription | null>;
        disable(id: string): Promise<Subscription>;
        enable(id: string): Promise<Subscription>;
    };
    subscribe(input: CreateSubscription): Promise<Subscription>;
    deliveries(opts?: { status?: 'pending' | 'delivered' | 'failed' | 'dead'; subscriptionId?: string; afterSeq?: number; limit?: number }): Promise<{ deliveries: Array<Record<string, unknown>>; counts: Record<string, number> }>;
    replay(opts: { subscriptionId: string; fromSeq?: number; eventIds?: string[] }): Promise<{ subscription_id: string; queued: number }>;
}

function createEventsClient

export declare function createEventsClient(client: OpenVibeClient, opts?: { source?: string; baseUrl?: string }): EventsClient;

function projectKey

'prj_01JAB…' -> 'p01jab…' (the second segment of a project's event types); null if not prj_<ULID>.

export declare function projectKey(projectId: string): string | null;

function appSource

'app_01JAB…' or 'app:app_01JAB…' -> 'app-01jab…' (the app's event source); null if not an app id.

export declare function appSource(appId: string): string | null;

type AppEventInput

An app event: event_type may be project-relative ('order.shipped'); actor and subject default to the app.

export type AppEventInput = Omit<EventInput, 'actor' | 'subject'> & Partial<Pick<EventEnvelope, 'actor' | 'subject'>>;

interface AppEventsClient

export interface AppEventsClient {
    projectId: string;
    /** app_<ULID> */
    appId: string;
    /** p<lowercased project ULID> */
    projectKey: string;
    /** app-<lowercased app ULID> */
    source: string;
    /** app.<projectKey>. */
    prefix: string;
    /** A project-relative type or pattern -> the full one ('order.*' -> 'app.<key>.order.*'; '*' -> 'app.<key>.*'). */
    topic(name: string): string;
    prepare(envelope: AppEventInput, opts?: { traceId?: string; now?: number }): EventEnvelope;
    publish(envelope: AppEventInput, opts?: { traceparent?: string }): Promise<PublishResult>;
    publish(envelopes: AppEventInput[], opts?: { traceparent?: string }): Promise<{ results: PublishResult[] }>;
    /** topic is project-relative (default '*'); platformTopics are first-party patterns (public events only). */
    pull(opts?: { topic?: string | string[]; platformTopics?: string[]; afterSeq?: number; limit?: number }): Promise<EventsPage>;
    iterate(opts?: { topic?: string | string[]; platformTopics?: string[]; afterSeq?: number; limit?: number; maxPages?: number; onGap?: (gap: Gap) => void | Promise<void>; onPage?: (page: EventsPage) => void | Promise<void> }): AsyncGenerator<StoredEvent, void, unknown>;
    get(eventId: string): Promise<StoredEvent | null>;
    getCheckpoint(topic: string): Promise<{ consumer: string; topic: string; cursor: number; updated_at: string | null }>;
    setCheckpoint(topic: string, cursor: number): Promise<{ consumer: string; topic: string; cursor: number }>;
    subscriptions: {
        /** topicPattern is project-relative (default '*'); the endpoint must be public https. */
        create(input: Partial<CreateSubscription> & { endpoint: string }): Promise<Subscription>;
        list(): Promise<Subscription[]>;
        get(id: string): Promise<Subscription | null>;
        disable(id: string): Promise<Subscription>;
        enable(id: string): Promise<Subscription>;
    };
    subscribe(input: Partial<CreateSubscription> & { endpoint: string }): Promise<Subscription>;
    /** The unscoped client underneath. */
    events: EventsClient;
}

function createAppEvents

Events for one developer app of one project (token: events.app.publish | read | subscribe). onBehalfOf (usr_…, the token's on_behalf_of) makes that person the default actor.

export declare function createAppEvents(client: OpenVibeClient, opts: { projectId: string; appId: string; onBehalfOf?: string; baseUrl?: string }): AppEventsClient;

function signDelivery

export declare function signDelivery(rawBody: RawBody, secret: string): string;

function verifyDelivery

export declare function verifyDelivery(rawBody: RawBody, signatureHeader: string | undefined | null, secret: string): boolean;

function signDeliveryV2

`t=<ts>,v2=<hex HMAC-SHA256 of "<ts>.<raw body>">`, the value of X-OpenVibe-Signature-V2 (timestamp in unix seconds, default now).

export declare function signDeliveryV2(rawBody: RawBody, secret: string, timestamp?: number): string;

function signDeliveryHeaders

X-OpenVibe-Signature, X-OpenVibe-Timestamp and X-OpenVibe-Signature-V2 for a delivery body, as Events sends them (now in ms).

export declare function signDeliveryHeaders(rawBody: RawBody, secret: string, opts?: { now?: number }): {
    'X-OpenVibe-Signature': string;
    'X-OpenVibe-Timestamp': string;
    'X-OpenVibe-Signature-V2': string;
};

interface DeliveryV2Options

export interface DeliveryV2Options {
    /** Seconds the timestamp may be away from `now`, either way. Default 300. */
    toleranceSec?: number;
    /** The current time in ms. Default Date.now(). */
    now?: number;
}

function verifyDeliveryV2

Constant-time check of X-OpenVibe-Signature-V2 over the raw body, and of its timestamp (±toleranceSec).

export declare function verifyDeliveryV2(rawBody: RawBody, headers: Record<string, any> | Headers, secret: string, opts?: DeliveryV2Options): boolean;

interface ParseDeliveryOptions

export interface ParseDeliveryOptions extends DeliveryV2Options {
    /** Refuse deliveries without X-OpenVibe-Signature-V2 (v1-only). Default false. A present v2 header must always verify. */
    requireV2?: boolean;
}

function parseDelivery

export declare function parseDelivery(rawBody: RawBody, headers: Record<string, any> | Headers, secret: string, opts?: ParseDeliveryOptions): { event: EventEnvelope; seq: number; subscriptionId: string | null; attempt: number } | null;

interface SqliteDatabase

The subset of a better-sqlite3 Database the outbox and inbox use.

export interface SqliteDatabase {
    prepare(sql: string): any;
    exec(sql: string): any;
    transaction<F extends (...args: any[]) => any>(fn: F): F;
    readonly inTransaction: boolean;
}

interface FlushStats

export interface FlushStats { sent: number; failed: number; rejected: number; }

interface Outbox

export interface Outbox {
    ensureSchema(): void;
    /** Inside the caller's transaction; returns the complete envelope. */
    enqueue(envelope: EventInput, opts?: { traceparent?: string }): EventEnvelope;
    flush(): Promise<FlushStats>;
    start(): void;
    stop(): Promise<unknown>;
    kick(): void;
    pending(): number;
    rejected(): number;
    prune(olderThanMs?: number): number;
}

function createOutbox

export declare function createOutbox(db: SqliteDatabase, opts: {
    events: Pick<EventsClient, 'publish' | 'prepare'>;
    table?: string; batchSize?: number; intervalMs?: number; backoffMs?: number[];
    now?: () => number; onError?: (err: unknown, row?: unknown) => void; allowOutsideTransaction?: boolean;
}): Outbox;

interface Inbox

export interface Inbox {
    ensureSchema(): void;
    once<T>(consumer: string, eventId: string, fn: () => T): { duplicate: true } | { duplicate: false; result: T };
    seen(consumer: string, eventId: string): boolean;
}

function createInbox

export declare function createInbox(db: SqliteDatabase, opts?: { table?: string; now?: () => number }): Inbox;