Add web capability seam: ctx.web, search/fetch providers, web tools
Introduce web access as a first-class capability seam so the model-facing web tools stay stable while backends change. dsh-web owns ctx.web as a provider registry with registration-order-independent selection and the WebError taxonomy; dsh-web-search-exa, dsh-web-search-perplexity, and dsh-web-fetch-local register capabilities into it; dsh-tool-web is the sole owner of the model-facing web_search/web_fetch schemas, prompt sections, and HTML-to-markdown presentation. Search and fetch are deliberately one seam. Providers ship as namespace plugins that register into ctx.web (like an LlmAdapter into ctx.llm), not key-owning services, since multiple search providers cannot each own the key. Tool registration follows product enablement, not backend availability, so load order/credentials never enter the model contract; the seam resolves the provider at execution time and surfaces a structured WebError otherwise. Moves the RFC to implemented/ amended to match what shipped. Example/app configs are intentionally not wired yet (RFC migration step 6).
This commit is contained in:
Dudu-0223
270
packages/web/web/src/index.ts
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270
packages/web/web/src/index.ts
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/**
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* The web access seam (`ctx.web`): a provider registry plus a provider-selecting
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* execution surface for two capabilities — search and fetch. Provider packages
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* register concrete backends with `registerSearchProvider` /
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* `registerFetchProvider`; the model-facing consumer
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* (`@deepseek-ai/dsh-tool-web`) reads capability status and executes through
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* `search()` / `fetch()`.
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*
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* The registry half stays close to `LlmService`: a `Map<id, provider>` per
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* capability kind, register methods that return disposers, duplicate ids that
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* throw, and execution-time resolution that throws when the selected provider is
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* absent or unusable. On top of that sits one small selection-status layer so
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* diagnostics and execution can explain why a capability can or cannot run,
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* independent of registration order.
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*
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* @module @deepseek-ai/dsh-web
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*/
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import { Context, Service } from 'cordis'
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import z from 'schemastery'
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import type {
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WebCapabilityStatus,
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WebExecContext,
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WebFetchProvider,
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WebFetchRequest,
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WebFetchResult,
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WebProviderStatus,
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WebSearchProvider,
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WebSearchRequest,
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WebSearchResult,
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} from './types.ts'
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import { WebError } from './types.ts'
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export {
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WebError,
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} from './types.ts'
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export type {
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WebCapabilityStatus,
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WebErrorCode,
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WebExecContext,
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WebFetchBody,
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WebFetchProvider,
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WebFetchRequest,
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WebFetchResult,
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WebProviderStatus,
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WebSearchProvider,
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WebSearchRequest,
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WebSearchResult,
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WebSearchSource,
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} from './types.ts'
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declare module 'cordis' {
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interface Context {
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web: WebService
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}
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interface Events {
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/**
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* Fired after the provider registry changes — a search or fetch provider was
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* registered or disposed. Carries no payload and no capability graph: it
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* means only "the provider registry changed; observers may recompute status
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* from `ctx.web`". `searchStatus()` / `fetchStatus()` stay derived, not
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* stored.
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* @mode emit
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*/
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'web/providers-change'(this: WebService): void
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}
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}
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/** Selection inputs shared by the status query and execution resolution. */
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interface Selection<P> {
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/** The configured provider id for this capability, if any. */
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readonly configuredId?: string
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/** Providers registered for this capability kind. */
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readonly providers: ReadonlyMap<string, P>
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}
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/**
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* Config for the web seam. `searchProvider` / `fetchProvider` pin which provider
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* wins for each capability; both are optional (a single registered usable
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* provider auto-selects). Operational overrides such as environment variables
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* must feed these same fields rather than introduce a hidden priority chain.
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*/
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export interface WebServiceConfig {
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/** Explicit search provider id. Omitted = auto-select when exactly one usable. */
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readonly searchProvider?: string
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/** Explicit fetch provider id. Omitted = auto-select when exactly one usable. */
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readonly fetchProvider?: string
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}
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/**
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* The web access service. Registered as `ctx.web` (one instance per context).
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*
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* Selection semantics (identical for status and execution, never order-
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* dependent):
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* - A configured id that is registered and `status().available` → that provider.
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* - A configured id not registered → `configured-missing` /
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* `WEB_PROVIDER_CONFIGURED_MISSING`.
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* - A configured id registered but unavailable → `configured-unavailable` /
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* `WEB_PROVIDER_CONFIGURED_UNAVAILABLE`.
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* - No id configured, exactly one registered usable provider → that provider.
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* - No id configured, multiple usable providers → `ambiguous` /
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* `WEB_PROVIDER_AMBIGUOUS`.
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* - No id configured, no usable provider → `none` / `WEB_PROVIDER_UNAVAILABLE`.
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*/
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export class WebService extends Service {
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/**
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* Provider selection config. Operational env overrides feed the SAME fields:
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* `$DSH_WEB_SEARCH_PROVIDER` / `$DSH_WEB_FETCH_PROVIDER` are equivalent to
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* `searchProvider` / `fetchProvider` and are NOT a hidden priority chain.
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*/
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static Config: z<WebServiceConfig> = z.object({
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searchProvider: z.string(),
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fetchProvider: z.string(),
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})
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private searchProviders = new Map<string, WebSearchProvider>()
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private fetchProviders = new Map<string, WebFetchProvider>()
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private readonly searchProviderId: string | undefined
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private readonly fetchProviderId: string | undefined
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constructor(ctx: Context, config: WebServiceConfig = {}) {
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super(ctx, 'web')
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this.searchProviderId = config.searchProvider ?? process.env.DSH_WEB_SEARCH_PROVIDER
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this.fetchProviderId = config.fetchProvider ?? process.env.DSH_WEB_FETCH_PROVIDER
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}
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/**
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* Register a search provider. Throws {@link WebError} `WEB_DUPLICATE_PROVIDER`
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* if its id is already registered for search. Returns a disposer; emits
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* `web/providers-change` after a successful register and again on dispose.
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* Disposed with the calling fiber.
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*/
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registerSearchProvider(provider: WebSearchProvider): () => void {
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return this.registerProvider(this.searchProviders, provider)
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}
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/**
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* Register a fetch provider. Throws {@link WebError} `WEB_DUPLICATE_PROVIDER`
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* if its id is already registered for fetch. Returns a disposer; emits
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* `web/providers-change` after a successful register and again on dispose.
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* Disposed with the calling fiber.
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*/
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registerFetchProvider(provider: WebFetchProvider): () => void {
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return this.registerProvider(this.fetchProviders, provider)
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}
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private registerProvider<P extends { readonly id: string }>(store: Map<string, P>, provider: P): () => void {
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if (store.has(provider.id)) {
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throw new WebError(`a web provider with id "${provider.id}" is already registered`, 'WEB_DUPLICATE_PROVIDER')
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}
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const dispose = this.ctx.effect(function* (this: WebService) {
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store.set(provider.id, provider)
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// Yield the rollback BEFORE emitting `web/providers-change`: the generator
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// effect collects each yielded disposer before the next step runs, so a
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// throwing change listener removes the just-added provider instead of
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// leaking it into the registry.
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yield () => {
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store.delete(provider.id)
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this.ctx.emit('web/providers-change')
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}
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this.ctx.emit('web/providers-change')
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}.bind(this), 'web.registerProvider()')
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// ctx.effect's disposer returns Promise<void>; our disposer API is
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// synchronous fire-and-forget — discard the (always-resolved) promise.
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return () => void dispose()
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}
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/** Search-capability selection status, derived live (never stored). */
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searchStatus(): WebCapabilityStatus {
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return resolveStatus({
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providers: this.searchProviders,
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...this.searchProviderId !== undefined ? { configuredId: this.searchProviderId } : {},
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})
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}
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/** Fetch-capability selection status, derived live (never stored). */
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fetchStatus(): WebCapabilityStatus {
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return resolveStatus({
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providers: this.fetchProviders,
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...this.fetchProviderId !== undefined ? { configuredId: this.fetchProviderId } : {},
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})
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}
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/**
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* Run one search through the selected provider. Resolves the provider at call
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* time with the selection rules above; throws {@link WebError} when the
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* capability cannot run. The seam enforces `request.maxResults` on the result:
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* if the provider over-returns, `sources[]` is truncated and `truncated` set.
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*/
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async search(request: WebSearchRequest, exec?: WebExecContext): Promise<WebSearchResult> {
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const provider = resolveProvider({
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providers: this.searchProviders,
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...this.searchProviderId !== undefined ? { configuredId: this.searchProviderId } : {},
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})
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const result = await provider.search(request, exec)
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return capSources(result, request.maxResults)
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}
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/**
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* Retrieve one URL through the selected provider. Resolves the provider at
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* call time with the selection rules above; throws {@link WebError} when the
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* capability cannot run. A non-2xx response is a result, not a throw.
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*/
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async fetch(request: WebFetchRequest, exec?: WebExecContext): Promise<WebFetchResult> {
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const provider = resolveProvider({
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providers: this.fetchProviders,
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...this.fetchProviderId !== undefined ? { configuredId: this.fetchProviderId } : {},
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})
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return provider.fetch(request, exec)
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}
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}
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interface ResolvableProvider {
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readonly id: string
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status(): WebProviderStatus
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}
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/** Compute the capability status from configured id + registered providers. */
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function resolveStatus<P extends ResolvableProvider>(selection: Selection<P>): WebCapabilityStatus {
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const { configuredId, providers } = selection
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if (configuredId !== undefined) {
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const provider = providers.get(configuredId)
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if (!provider) return { available: false, reason: 'configured-missing' }
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if (!provider.status().available) return { available: false, reason: 'configured-unavailable' }
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return { available: true, providerId: configuredId }
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}
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const usable = [...providers.values()].filter(provider => provider.status().available)
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const [single] = usable
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if (single === undefined) return { available: false, reason: 'none' }
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if (usable.length > 1) return { available: false, reason: 'ambiguous' }
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return { available: true, providerId: single.id }
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}
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/**
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* Resolve the selected provider or throw the matching {@link WebError}. Shares
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* the selection rules with {@link resolveStatus} so status and execution can
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* never disagree.
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*/
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function resolveProvider<P extends ResolvableProvider>(selection: Selection<P>): P {
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const { configuredId, providers } = selection
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if (configuredId !== undefined) {
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const provider = providers.get(configuredId)
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if (!provider) {
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throw new WebError(`configured web provider "${configuredId}" is not registered`, 'WEB_PROVIDER_CONFIGURED_MISSING')
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}
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if (!provider.status().available) {
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throw new WebError(`configured web provider "${configuredId}" is registered but unavailable`, 'WEB_PROVIDER_CONFIGURED_UNAVAILABLE')
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}
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return provider
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}
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const usable = [...providers.values()].filter(provider => provider.status().available)
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const [single] = usable
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if (single === undefined) {
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throw new WebError('no usable web provider is registered', 'WEB_PROVIDER_UNAVAILABLE')
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}
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if (usable.length > 1) {
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const ids = usable.map(provider => provider.id).join(', ')
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throw new WebError(`multiple usable web providers are registered (${ids}); configure one explicitly`, 'WEB_PROVIDER_AMBIGUOUS')
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}
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return single
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}
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/** Enforce `maxResults` on a search result: truncate `sources[]` and flag it. */
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function capSources(result: WebSearchResult, maxResults: number | undefined): WebSearchResult {
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if (maxResults === undefined || result.sources.length <= maxResults) return result
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return { ...result, sources: result.sources.slice(0, maxResults), truncated: true }
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}
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export default WebService
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225
packages/web/web/src/types.ts
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225
packages/web/web/src/types.ts
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@@ -0,0 +1,225 @@
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/**
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* Vocabulary for the web capability seam (`ctx.web`): the search/fetch
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* request/result shapes providers produce and consumers format, the provider
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* and capability status discriminants selection reports, the execution-control
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* context, and the typed error taxonomy.
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*
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* These types are shared by every provider backend
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* (`@deepseek-ai/dsh-web-search-exa`, `@deepseek-ai/dsh-web-search-perplexity`,
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* `@deepseek-ai/dsh-web-fetch-local`, and future backends) and by the
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* model-facing consumer (`@deepseek-ai/dsh-tool-web`). Search and fetch share no
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* request schema and no business logic, but they are deliberately one seam:
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* `ctx.web` is a single web-access middle layer with one provider-selection
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* policy, one abort/error vocabulary, and one product-facing configuration
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* point. The cost is the parallel `Search`/`Fetch` shapes below; that
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* parallelism is intentional.
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*
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* @module @deepseek-ai/dsh-web/types
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*/
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import { HarnessError } from '@deepseek-ai/dsh-llm'
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/**
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* Execution control threaded from the tool layer through the seam into a
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* provider's network requests, stream readers, and expensive decoding. It is
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* NOT business input: the first version carries only `signal` so `tool-web` can
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* propagate turn cancellation, tool timeout, and agent disposal. It deliberately
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* does NOT carry `ToolExecution`, which would make `dsh-web` depend on
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* `dsh-tools`.
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*/
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export interface WebExecContext {
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/** Abort signal a provider must honor for its network/decoding work. */
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readonly signal?: AbortSignal
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}
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/**
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* What one search-capable backend can return. The model-facing argument is just
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* a query; `maxResults` is a `dsh-tool-web`-layer bound passed through unchanged
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* and enforced on the way back by the seam (see {@link WebSearchResult}).
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*/
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export interface WebSearchRequest {
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readonly query: string
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/**
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* Upper bound on returned sources; the seam truncates to it. Omitted = no
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* bound. `dsh-tool-web` always sets it. A provider whose API supports a
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* result-count control (Exa's `numResults`) should apply it at the request
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* layer as a cost/latency optimization; the seam enforces the bound
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* regardless.
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*/
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readonly maxResults?: number
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}
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/**
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* Normalized search outcome. `content` is optional provider-generated answer
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* text or summary (Exa returns none; Perplexity returns a generated answer).
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* `sources[]` is the portable citation surface. `truncated` is set by the seam
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* when it cut `sources[]` down to `maxResults`.
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*/
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export interface WebSearchResult {
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/** Id of the provider that produced this result. */
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readonly providerId: string
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/** Echo of the query the provider answered. */
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readonly query: string
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/** Optional provider-generated answer text, search context, or summary. */
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readonly content?: string
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/** Citeable sources, already truncated to the request's `maxResults`. */
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readonly sources: readonly WebSearchSource[]
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/** True when the seam dropped sources to honor `maxResults`. */
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readonly truncated: boolean
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}
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/**
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* One citeable source. A source always has a URL; `title`, `snippet`, and
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* `publishedAt` are optional because not every provider returns them — forcing
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* adapters to invent them would make the seam lie (Perplexity citations may be
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* URL-only). `dsh-tool-web` renders `title ?? hostname(url)` for display.
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*/
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export interface WebSearchSource {
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readonly url: string
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readonly title?: string
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readonly snippet?: string
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/** Publication/crawl timestamp as a provider-supplied ISO-8601 string. */
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readonly publishedAt?: string
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}
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/**
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* What one fetch-capable backend is asked to retrieve. `timeoutMs` is an
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* optional positive hint the provider caps. The request deliberately omits
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* `format`, `prompt`, and extraction controls — those are presentation or
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* higher-level LLM concerns, not safe-retrieval inputs.
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*/
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export interface WebFetchRequest {
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readonly url: string
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readonly timeoutMs?: number
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}
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/**
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* Normalized fetch outcome. A successful network fetch of a non-2xx response is
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* a result, not an error: the status code is part of the fetched resource
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* state. {@link WebError} is reserved for failures to safely retrieve or
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* represent the resource.
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*/
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export interface WebFetchResult {
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/** Id of the provider that produced this result. */
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readonly providerId: string
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/** The final URL after allowed redirects (the request URL is in the request). */
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readonly url: string
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/** HTTP status code of the fetched response. */
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readonly statusCode: number
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/** Decoded body, classified by content kind. */
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readonly body: WebFetchBody
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/** True when the provider capped the decoded body. */
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readonly truncated: boolean
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}
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/**
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* The decoded body of a fetched resource. A CLOSED discriminated union owned by
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* `dsh-web`: the provider decodes the kind and `dsh-tool-web` renders it, so a
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* new kind is a coordinated change across known packages, not a plugin
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* extension. Consumers `switch` on `kind` ending in `default: assertNever(...)`
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* so adding a kind breaks compilation at every consumer until handled. Each arm
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* stays its own object literal even where fields coincide today, leaving room
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* for arm-specific fields later (a `pdf` body's `pageCount`).
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*/
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export type WebFetchBody =
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| { readonly kind: 'html'; readonly content: string }
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| { readonly kind: 'text'; readonly content: string }
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/**
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* Whether one concrete provider implementation is usable, by cheap local checks
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* only (credential presence, parseable endpoint config). A provider `status()`
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* must NOT make network calls. It is an input to selection, not a health system.
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*/
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export type WebProviderStatus =
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| { readonly available: true }
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| { readonly available: false; readonly reason: 'missing-credential' | 'misconfigured' }
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||||
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/**
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* Whether a capability (search or fetch) has a selected usable provider, or the
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* broad category in which selection fails. Intentionally small: it carries the
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||||
* winning `providerId` on the available branch (so diagnostics can report which
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||||
* provider won) but NOT the per-reason payload (the missing id, the ambiguous
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||||
* candidate set). That branchable detail lives in the {@link WebError} thrown at
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||||
* execution time — the surface callers route on — so the same fact does not get
|
||||
* two homes that can disagree.
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*/
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export type WebCapabilityStatus =
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| { readonly available: true; readonly providerId: string }
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||||
| { readonly available: false; readonly reason: 'none' | 'configured-missing' | 'configured-unavailable' | 'ambiguous' }
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||||
|
||||
/**
|
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* A search-capable backend. Registered with `ctx.web.registerSearchProvider`.
|
||||
* `id` is a stable string, unique within the search capability kind.
|
||||
*/
|
||||
export interface WebSearchProvider {
|
||||
readonly id: string
|
||||
/** Cheap local usability check; must not make network calls. */
|
||||
status(): WebProviderStatus
|
||||
/** Run one search; honor `exec.signal` for cancellation. */
|
||||
search(request: WebSearchRequest, exec?: WebExecContext): Promise<WebSearchResult>
|
||||
}
|
||||
|
||||
/**
|
||||
* A fetch-capable backend. Registered with `ctx.web.registerFetchProvider`.
|
||||
* `id` is a stable string, unique within the fetch capability kind.
|
||||
*/
|
||||
export interface WebFetchProvider {
|
||||
readonly id: string
|
||||
/** Cheap local usability check; must not make network calls. */
|
||||
status(): WebProviderStatus
|
||||
/** Retrieve one URL; honor `exec.signal` for cancellation. */
|
||||
fetch(request: WebFetchRequest, exec?: WebExecContext): Promise<WebFetchResult>
|
||||
}
|
||||
|
||||
/**
|
||||
* Stable codes for {@link WebError}. Callers (hooks, tests, UI) route on these.
|
||||
*
|
||||
* - `WEB_PROVIDER_UNAVAILABLE`: no provider configured and none usable.
|
||||
* - `WEB_PROVIDER_CONFIGURED_MISSING`: a configured id is not registered.
|
||||
* - `WEB_PROVIDER_CONFIGURED_UNAVAILABLE`: a configured id is registered but its
|
||||
* `status()` reports unavailable.
|
||||
* - `WEB_PROVIDER_AMBIGUOUS`: no id configured and multiple usable providers
|
||||
* exist (selection refuses to pick by registration order).
|
||||
* - `WEB_DUPLICATE_PROVIDER`: a registration-time programming error — an id is
|
||||
* already registered for that capability kind.
|
||||
* - `WEB_INVALID_URL`: the fetch URL is malformed or not http(s).
|
||||
* - `WEB_BLOCKED_URL`: the fetch URL is rejected by policy (credentials in URL).
|
||||
* - `WEB_REDIRECT_BLOCKED`: a cross-origin redirect was refused.
|
||||
* - `WEB_FETCH_TOO_LARGE`: the response exceeded the byte/character cap.
|
||||
* - `WEB_FETCH_TIMEOUT`: the fetch exceeded its timeout.
|
||||
* - `WEB_ABORTED`: the operation was aborted via `WebExecContext.signal`.
|
||||
* - `WEB_UNSUPPORTED_CONTENT_TYPE`: the response content type cannot be decoded.
|
||||
* - `WEB_PROVIDER_ERROR`: catch-all for a provider's own failure surfaced through
|
||||
* the seam, including network/transport failure (DNS, connection refused, TLS).
|
||||
*/
|
||||
export type WebErrorCode =
|
||||
| 'WEB_PROVIDER_UNAVAILABLE'
|
||||
| 'WEB_PROVIDER_CONFIGURED_MISSING'
|
||||
| 'WEB_PROVIDER_CONFIGURED_UNAVAILABLE'
|
||||
| 'WEB_PROVIDER_AMBIGUOUS'
|
||||
| 'WEB_DUPLICATE_PROVIDER'
|
||||
| 'WEB_INVALID_URL'
|
||||
| 'WEB_BLOCKED_URL'
|
||||
| 'WEB_REDIRECT_BLOCKED'
|
||||
| 'WEB_FETCH_TOO_LARGE'
|
||||
| 'WEB_FETCH_TIMEOUT'
|
||||
| 'WEB_ABORTED'
|
||||
| 'WEB_UNSUPPORTED_CONTENT_TYPE'
|
||||
| 'WEB_PROVIDER_ERROR'
|
||||
|
||||
/**
|
||||
* Typed web error. Extends {@link HarnessError} so it carries a stable
|
||||
* {@link WebErrorCode} and chains `cause`. `dsh-web` owns this vocabulary so
|
||||
* providers, the seam, and the tool layer raise the same codes instead of each
|
||||
* inventing message strings. `ToolRegistry.execute()` converts a thrown
|
||||
* `WebError` into an error tool result whose structured metadata exposes the
|
||||
* code.
|
||||
*/
|
||||
export class WebError extends HarnessError {
|
||||
override readonly code: WebErrorCode
|
||||
|
||||
constructor(message: string, code: WebErrorCode, options?: ErrorOptions) {
|
||||
super(message, code, options)
|
||||
this.code = code
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user