Move router into app, and out of util
This commit is contained in:
Jon Staab
@@ -0,0 +1,585 @@
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import {first, switcher, throttleWithValue, clamp, last, splitAt, identity, sortBy, uniq, shuffle, pushToMapKey} from '@welshman/lib'
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import {Tags, getFilterId, unionFilters, isShareableRelayUrl, isCommunityAddress, isGroupAddress, isContextAddress} from '@welshman/util'
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import type {TrustedEvent, Filter} from '@welshman/util'
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import {NetworkContext, ConnectionStatus} from '@welshman/net'
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import {AppContext} from './core'
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import type {PartialSubscribeRequest} from './core'
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import {pubkey} from './session'
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import {relaySelectionsByPubkey, getReadRelayUrls, getWriteRelayUrls, getRelayUrls} from './relaySelections'
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import {relays, relaysByUrl} from './relays'
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export enum RelayMode {
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Read = "read",
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Write = "write",
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Inbox = "inbox"
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}
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export type RouterOptions = {
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/**
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* Retrieves the user's public key.
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* @returns The user's public key as a string, or null if not available.
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*/
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getUserPubkey?: () => string | null
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/**
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* Retrieves group relays for the specified community.
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* @param address - The address to retrieve group relays for.
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* @returns An array of group relay URLs as strings.
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*/
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getGroupRelays?: (address: string) => string[]
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/**
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* Retrieves relays for the specified community.
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* @param address - The address to retrieve community relays for.
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* @returns An array of community relay URLs as strings.
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*/
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getCommunityRelays?: (address: string) => string[]
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/**
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* Retrieves relays for the specified public key and mode.
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* @param pubkey - The public key to retrieve relays for.
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* @param mode - The relay mode (optional). May be "read", "write", or "inbox".
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* @returns An array of relay URLs as strings.
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*/
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getPubkeyRelays?: (pubkey: string, mode?: RelayMode) => string[]
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/**
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* Retrieves fallback relays, for use when no other relays can be selected.
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* @returns An array of relay URLs as strings.
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*/
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getFallbackRelays: () => string[]
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/**
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* Retrieves relays likely to support NIP-50 search.
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* @returns An array of relay URLs as strings.
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*/
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getSearchRelays?: () => string[]
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/**
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* Retrieves the quality of the specified relay.
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* @param url - The URL of the relay to retrieve quality for.
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* @returns The quality of the relay as a number between 0 and 1 inclusive.
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*/
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getRelayQuality?: (url: string) => number
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/**
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* Retrieves the redundancy setting, which is how many relays to use per selection value.
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* @returns The redundancy setting as a number.
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*/
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getRedundancy?: () => number
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/**
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* Retrieves the limit setting, which is the maximum number of relays that should be
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* returned from getUrls and getSelections.
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* @returns The limit setting as a number.
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*/
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getLimit?: () => number
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}
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export type ValuesByRelay = Map<string, string[]>
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export type RelayValues = {
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relay: string
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values: string[]
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}
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export type ValueRelays = {
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value: string
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relays: string[]
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}
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// Fallback policies
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export type FallbackPolicy = (count: number, limit: number) => number
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export const addNoFallbacks = (count: number, redundancy: number) => 0
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export const addMinimalFallbacks = (count: number, redundancy: number) => count > 0 ? 0 : 1
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export const addMaximalFallbacks = (count: number, redundancy: number) => redundancy - count
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export class Router {
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constructor(readonly options: RouterOptions) {}
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// Utilities derived from options
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getPubkeySelection = (pubkey: string, mode?: RelayMode) =>
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this.selection(pubkey, this.options.getPubkeyRelays?.(pubkey, mode) || [])
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getPubkeySelections = (pubkeys: string[], mode?: RelayMode) =>
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pubkeys.map(pubkey => this.getPubkeySelection(pubkey, mode))
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getUserSelections = (mode?: RelayMode) =>
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this.getPubkeySelections([this.options.getUserPubkey?.()].filter(identity) as string[], mode)
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getContextSelections = (tags: Tags) => {
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return [
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...tags.communities().mapTo(t => this.selection(t.value(), this.options.getCommunityRelays?.(t.value()) || [])).valueOf(),
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...tags.groups().mapTo(t => this.selection(t.value(), this.options.getGroupRelays?.(t.value()) || [])).valueOf(),
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]
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}
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// Utilities for creating ValueRelays
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selection = (value: string, relays: Iterable<string>) => ({value, relays: Array.from(relays)})
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selections = (values: string[], relays: string[]) =>
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values.map(value => this.selection(value, relays))
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forceValue = (value: string, selections: ValueRelays[]) =>
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selections.map(({relays}) => this.selection(value, relays))
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// Utilities for processing hints
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relaySelectionsFromMap = (valuesByRelay: ValuesByRelay) =>
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sortBy(
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({values}) => -values.length,
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Array.from(valuesByRelay)
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.map(([relay, values]: [string, string[]]) => ({relay, values: uniq(values)}))
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)
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scoreRelaySelection = ({values, relay}: RelayValues) =>
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values.length * (this.options.getRelayQuality?.(relay) || 1)
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sortRelaySelections = (relaySelections: RelayValues[]) => {
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const scores = new Map<string, number>()
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const getScore = (relayValues: RelayValues) => -(scores.get(relayValues.relay) || 0)
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for (const relayValues of relaySelections) {
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scores.set(relayValues.relay, this.scoreRelaySelection(relayValues))
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}
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return sortBy(getScore, relaySelections.filter(getScore))
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}
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// Utilities for creating scenarios
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scenario = (selections: ValueRelays[]) => new RouterScenario(this, selections)
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merge = (scenarios: RouterScenario[]) =>
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this.scenario(scenarios.flatMap((scenario: RouterScenario) => scenario.selections))
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product = (values: string[], relays: string[]) =>
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this.scenario(this.selections(values, relays))
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fromRelays = (relays: string[]) => this.scenario([this.selection("", relays)])
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// Routing scenarios
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User = () => this.scenario(this.getUserSelections())
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ReadRelays = () => this.scenario(this.getUserSelections(RelayMode.Read))
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WriteRelays = () => this.scenario(this.getUserSelections(RelayMode.Write))
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Messages = (pubkeys: string[]) =>
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this.scenario([
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...this.getUserSelections(),
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...this.getPubkeySelections(pubkeys),
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])
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PublishMessage = (pubkey: string) =>
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this.scenario([
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...this.getUserSelections(RelayMode.Inbox),
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this.getPubkeySelection(pubkey, RelayMode.Inbox),
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]).policy(addMinimalFallbacks)
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Event = (event: TrustedEvent) =>
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this.scenario(this.forceValue(event.id, [
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this.getPubkeySelection(event.pubkey, RelayMode.Write),
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...this.getContextSelections(Tags.fromEvent(event).context()),
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]))
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EventChildren = (event: TrustedEvent) =>
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this.scenario(this.forceValue(event.id, [
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this.getPubkeySelection(event.pubkey, RelayMode.Read),
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...this.getContextSelections(Tags.fromEvent(event).context()),
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]))
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EventAncestors = (event: TrustedEvent, type: "mentions" | "replies" | "roots") => {
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const tags = Tags.fromEvent(event)
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const ancestors = tags.ancestors()[type]
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const pubkeys = tags.values("p").valueOf()
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const communities = tags.communities().values().valueOf()
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const groups = tags.groups().values().valueOf()
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const relays = uniq([
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...this.options.getPubkeyRelays?.(event.pubkey, RelayMode.Read) || [],
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...pubkeys.flatMap((k: string) => this.options.getPubkeyRelays?.(k, RelayMode.Write) || []),
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...communities.flatMap((a: string) => this.options.getCommunityRelays?.(a) || []),
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...groups.flatMap((a: string) => this.options.getGroupRelays?.(a) || []),
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...ancestors.relays().valueOf(),
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])
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return this.product(ancestors.values().valueOf(), relays)
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}
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EventMentions = (event: TrustedEvent) => this.EventAncestors(event, "mentions")
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EventParents = (event: TrustedEvent) => this.EventAncestors(event, "replies")
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EventRoots = (event: TrustedEvent) => this.EventAncestors(event, "roots")
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PublishEvent = (event: TrustedEvent) => {
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const tags = Tags.fromEvent(event)
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const mentions = tags.values("p").valueOf()
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// If we're publishing to private groups, only publish to those groups' relays
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if (tags.groups().exists()) {
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return this
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.scenario(this.getContextSelections(tags.groups()))
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.policy(addNoFallbacks)
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}
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return this.scenario(this.forceValue(event.id, [
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this.getPubkeySelection(event.pubkey, RelayMode.Write),
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...this.getContextSelections(tags.context()),
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...this.getPubkeySelections(mentions, RelayMode.Read),
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]))
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}
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FromPubkeys = (pubkeys: string[]) =>
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this.scenario(this.getPubkeySelections(pubkeys, RelayMode.Write))
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ForPubkeys = (pubkeys: string[]) =>
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this.scenario(this.getPubkeySelections(pubkeys, RelayMode.Read))
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WithinGroup = (address: string, relays?: string) =>
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this
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.scenario(this.getContextSelections(Tags.wrap([["a", address]])))
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.policy(addNoFallbacks)
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WithinCommunity = (address: string) =>
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this.scenario(this.getContextSelections(Tags.wrap([["a", address]])))
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WithinContext = (address: string) => {
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if (isGroupAddress(address)) {
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return this.WithinGroup(address)
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}
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if (isCommunityAddress(address)) {
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return this.WithinCommunity(address)
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}
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throw new Error(`Unknown context ${address}`)
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}
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WithinMultipleContexts = (addresses: string[]) =>
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this.merge(addresses.map(this.WithinContext))
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Search = (term: string, relays: string[] = []) =>
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this.product([term], uniq(relays.concat(this.options.getSearchRelays?.() || [])))
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}
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// Router Scenario
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export type RouterScenarioOptions = {
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redundancy?: number
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policy?: FallbackPolicy
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limit?: number
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}
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export class RouterScenario {
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constructor(readonly router: Router, readonly selections: ValueRelays[], readonly options: RouterScenarioOptions = {}) {}
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clone = (options: RouterScenarioOptions) =>
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new RouterScenario(this.router, this.selections, {...this.options, ...options})
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select = (f: (selection: string) => boolean) =>
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new RouterScenario(this.router, this.selections.filter(({value}) => f(value)), this.options)
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redundancy = (redundancy: number) => this.clone({redundancy})
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policy = (policy: FallbackPolicy) => this.clone({policy})
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limit = (limit: number) => this.clone({limit})
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getRedundancy = () => this.options.redundancy || this.router.options.getRedundancy?.() || 3
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getPolicy = () => this.options.policy || addMaximalFallbacks
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getLimit = () => this.options.limit || this.router.options.getLimit?.() || 10
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getSelections = () => {
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const allValues = new Set()
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const valuesByRelay: ValuesByRelay = new Map()
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for (const {value, relays} of this.selections) {
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allValues.add(value)
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for (const relay of relays) {
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if (isShareableRelayUrl(relay)) {
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pushToMapKey(valuesByRelay, relay, value)
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}
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}
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}
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// Adjust redundancy by limit, since if we're looking for very specific values odds
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// are we're less tolerant of failure. Add more redundancy to fill our relay limit.
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const limit = this.getLimit()
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const redundancy = this.getRedundancy()
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const adjustedRedundancy = Math.max(redundancy, redundancy * (limit / (allValues.size * redundancy)))
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const seen = new Map<string, number>()
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const result: ValuesByRelay = new Map()
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const relaySelections = this.router.relaySelectionsFromMap(valuesByRelay)
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for (const {relay} of this.router.sortRelaySelections(relaySelections)) {
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const values = new Set<string>()
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for (const value of uniq(valuesByRelay.get(relay) || [])) {
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const timesSeen = seen.get(value) || 0
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if (timesSeen < adjustedRedundancy) {
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seen.set(value, timesSeen + 1)
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values.add(value)
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}
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}
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if (values.size > 0) {
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result.set(relay, Array.from(values))
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}
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}
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const fallbacks = shuffle(this.router.options.getFallbackRelays())
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const fallbackPolicy = this.getPolicy()
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for (const {value} of this.selections) {
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const timesSeen = seen.get(value) || 0
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const fallbacksNeeded = fallbackPolicy(timesSeen, adjustedRedundancy)
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if (fallbacksNeeded > 0) {
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for (const relay of fallbacks.slice(0, fallbacksNeeded)) {
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pushToMapKey(result, relay, value)
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}
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}
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}
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const [keep, discard] = splitAt(limit, this.router.relaySelectionsFromMap(result))
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for (const target of keep.slice(0, redundancy)) {
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target.values = uniq(discard.concat(target).flatMap((selection: RelayValues) => selection.values))
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}
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return keep
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}
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getUrls = () => this.getSelections().map((selection: RelayValues) => selection.relay)
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getUrl = () => first(this.getUrls())
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}
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// Default router options
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export const getRelayQuality = (url: string) => {
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const oneMinute = 60 * 1000
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const oneHour = 60 * oneMinute
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const oneDay = 24 * oneHour
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const oneWeek = 7 * oneDay
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const relay = relaysByUrl.get().get(url)
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const connect_count = relay?.stats?.connect_count || 0
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const recent_errors = relay?.stats?.recent_errors || []
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const connection = NetworkContext.pool.get(url, {autoConnect: false})
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// If we haven't connected, consult our relay record and see if there has
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// been a recent fault. If there has been, penalize the relay. If there have been several,
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// don't use the relay.
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if (!connection) {
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const lastFault = last(recent_errors) || 0
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if (recent_errors.filter(n => n > Date.now() - oneHour).length > 10) {
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return 0
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}
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if (recent_errors.filter(n => n > Date.now() - oneDay).length > 50) {
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return 0
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}
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if (recent_errors.filter(n => n > Date.now() - oneWeek).length > 100) {
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return 0
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}
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return Math.max(0, Math.min(0.5, (Date.now() - oneMinute - lastFault) / oneHour))
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}
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return switcher(connection.meta.getStatus(), {
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[ConnectionStatus.Unauthorized]: 0.5,
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[ConnectionStatus.Forbidden]: 0,
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[ConnectionStatus.Error]: 0,
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[ConnectionStatus.Closed]: 0.6,
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[ConnectionStatus.Slow]: 0.5,
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[ConnectionStatus.Ok]: 1,
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default: clamp([0.5, 1], connect_count / 1000),
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})
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}
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export const getPubkeyRelays = (pubkey: string, mode?: string) => {
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const $relaySelections = relaySelectionsByPubkey.get()
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const $inboxSelections = relaySelectionsByPubkey.get()
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switch (mode) {
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case RelayMode.Read: return getReadRelayUrls($relaySelections.get(pubkey))
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case RelayMode.Write: return getWriteRelayUrls($relaySelections.get(pubkey))
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case RelayMode.Inbox: return getRelayUrls($inboxSelections.get(pubkey))
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default: return getRelayUrls($relaySelections.get(pubkey))
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}
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}
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export const getFallbackRelays = throttleWithValue(300, () =>
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relays.get().filter(r => getRelayQuality(r.url) >= 0.5).map(r => r.url)
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)
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export const getSearchRelays = throttleWithValue(300, () =>
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relays.get().filter(r => getRelayQuality(r.url) >= 0.5 && r.profile?.supported_nips?.includes(50)).map(r => r.url)
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)
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export const makeRouter = (options: Partial<RouterOptions> = {}) =>
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new Router({
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getPubkeyRelays,
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getFallbackRelays,
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getSearchRelays,
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getRelayQuality,
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getUserPubkey: () => pubkey.get(),
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getRedundancy: () => 2,
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getLimit: () => 5,
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...options,
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})
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// Infer relay selections from filters
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export type RelayFilters = {
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relay: string
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filters: Filter[]
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}
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export type FilterSelection = {
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id: string,
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filter: Filter,
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scenario: RouterScenario
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}
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export const makeFilterSelection = (id: string, filter: Filter, scenario: RouterScenario) =>
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({id, filter, scenario})
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export const getFilterSelectionsForSearch = (filter: Filter) => {
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const id = getFilterId(filter)
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const relays = AppContext.router.options.getSearchRelays?.() || []
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const scenario = AppContext.router.product([id], relays)
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|
||||
return [makeFilterSelection(id, filter, scenario)]
|
||||
}
|
||||
|
||||
export const getFilterSelectionsForContext = (filter: Filter) => {
|
||||
const filterSelections = []
|
||||
const contexts = filter["#a"].filter(isContextAddress)
|
||||
const scenario = AppContext.router.WithinMultipleContexts(contexts)
|
||||
|
||||
for (const {relay, values} of scenario.getSelections()) {
|
||||
const contextFilter = {...filter, "#a": Array.from(values)}
|
||||
const id = getFilterId(contextFilter)
|
||||
const scenario = AppContext.router.product([id], [relay])
|
||||
|
||||
filterSelections.push(
|
||||
makeFilterSelection(id, contextFilter, scenario)
|
||||
)
|
||||
}
|
||||
|
||||
return filterSelections
|
||||
}
|
||||
|
||||
export const getFilterSelectionsForAuthors = (filter: Filter) => {
|
||||
const filterSelections = []
|
||||
const scenario = AppContext.router.FromPubkeys(filter.authors!)
|
||||
|
||||
for (const {relay, values} of scenario.getSelections()) {
|
||||
const authorsFilter = {...filter, authors: Array.from(values)}
|
||||
const id = getFilterId(authorsFilter)
|
||||
|
||||
filterSelections.push(
|
||||
makeFilterSelection(id, authorsFilter, AppContext.router.product([id], [relay]))
|
||||
)
|
||||
}
|
||||
|
||||
return filterSelections
|
||||
}
|
||||
|
||||
export const getFilterSelectionsForMentions = (filter: Filter) => {
|
||||
const filterSelections = []
|
||||
const scenario = AppContext.router.ForPubkeys(filter['#p']!)
|
||||
|
||||
for (const {relay, values} of scenario.getSelections()) {
|
||||
const mentionsFilter = {...filter, '#p': Array.from(values)}
|
||||
const id = getFilterId(mentionsFilter)
|
||||
|
||||
filterSelections.push(
|
||||
makeFilterSelection(id, mentionsFilter, AppContext.router.product([id], [relay]))
|
||||
)
|
||||
}
|
||||
|
||||
return filterSelections
|
||||
}
|
||||
|
||||
export const getFilterSelectionsForUser = (filter: Filter) => {
|
||||
const id = getFilterId(filter)
|
||||
const scenario = AppContext.router.ReadRelays()
|
||||
|
||||
return [makeFilterSelection(id, filter, AppContext.router.product([id], scenario.getUrls()))]
|
||||
}
|
||||
|
||||
export const getFilterSelections = (filters: Filter[]): RelayFilters[] => {
|
||||
const scenarios: RouterScenario[] = []
|
||||
const filtersById = new Map<string, Filter>()
|
||||
|
||||
const addSelections = (selections: FilterSelection[]) => {
|
||||
for (const {id, filter, scenario} of selections) {
|
||||
filtersById.set(id, filter)
|
||||
scenarios.push(scenario)
|
||||
}
|
||||
}
|
||||
|
||||
for (const filter of filters) {
|
||||
if (filter.search) {
|
||||
addSelections(getFilterSelectionsForSearch(filter))
|
||||
}
|
||||
|
||||
if (filter["#a"]?.some(isContextAddress)) {
|
||||
addSelections(getFilterSelectionsForContext(filter))
|
||||
}
|
||||
|
||||
if (filter.authors) {
|
||||
addSelections(getFilterSelectionsForAuthors(filter))
|
||||
}
|
||||
|
||||
if (filter['#p']) {
|
||||
addSelections(getFilterSelectionsForMentions(filter))
|
||||
}
|
||||
|
||||
if (scenarios.length === 0) {
|
||||
addSelections(getFilterSelectionsForUser(filter))
|
||||
}
|
||||
}
|
||||
|
||||
// Use low redundancy because filters will be very low cardinality
|
||||
const selections = AppContext.router
|
||||
.merge(scenarios)
|
||||
.redundancy(1)
|
||||
.getSelections()
|
||||
.map(({values, relay}) => ({
|
||||
filters: values.map(id => filtersById.get(id)!),
|
||||
relay,
|
||||
}))
|
||||
|
||||
// Pubkey-based selections can get really big. Use the most popular relays for the long tail
|
||||
const limit = AppContext.router.options.getLimit?.() || 8
|
||||
const redundancy = AppContext.router.options.getRedundancy?.() || 3
|
||||
const [keep, discard] = splitAt(limit, selections)
|
||||
|
||||
for (const target of keep.slice(0, redundancy)) {
|
||||
target.filters = unionFilters([...discard, target].flatMap(s => s.filters))
|
||||
}
|
||||
|
||||
return keep
|
||||
}
|
||||
|
||||
export const splitRequest = (req: PartialSubscribeRequest) => {
|
||||
if ((req.relays || []).length > 0) return [req]
|
||||
|
||||
return getFilterSelections(req.filters)
|
||||
.map(({relay, filters}) => ({...req, filters, relays: [relay]}))
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user