Jon Staab
74 lines
2.0 KiB
TypeScript
74 lines
2.0 KiB
TypeScript
import {writable, derived, Subscriber} from "svelte/store"
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import {fetchJson, Maybe} from "@welshman/lib"
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import {RelayProfile} from "@welshman/util"
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import {displayRelayUrl, displayRelayProfile} from "@welshman/util"
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import {getter, deriveItems, makeForceLoadItem, makeLoadItem, makeDeriveItem} from "@welshman/store"
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export const relaysByUrl = writable(new Map<string, RelayProfile>())
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export const relays = deriveItems(relaysByUrl)
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export const getRelaysByUrl = getter(relaysByUrl)
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export const getRelays = getter(relays)
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export const getRelay = (url: string) => getRelaysByUrl().get(url)
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export const relaySubscribers: Subscriber<RelayProfile>[] = []
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export const notifyRelay = (relay: RelayProfile) => relaySubscribers.forEach(sub => sub(relay))
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export const onRelay = (sub: (relay: RelayProfile) => void) => {
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relaySubscribers.push(sub)
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return () => {
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const i = relaySubscribers.findIndex(s => s === sub)
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if (i !== -1) relaySubscribers.splice(i, 1)
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}
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}
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export const fetchRelay = async (url: string): Promise<Maybe<RelayProfile>> => {
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try {
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const json = await fetchJson(url.replace(/^ws/, "http"), {
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headers: {
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Accept: "application/nostr+json",
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},
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})
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if (json) {
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const info = {...json, url}
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if (!Array.isArray(info.supported_nips)) {
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info.supported_nips = []
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}
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info.supported_nips = info.supported_nips.map(String)
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relaysByUrl.update($relaysByUrl => {
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$relaysByUrl.set(url, info)
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return $relaysByUrl
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})
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notifyRelay(info)
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return info
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}
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} catch (e) {
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// pass
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}
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}
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export const forceLoadRelay = makeForceLoadItem(fetchRelay, getRelay)
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export const loadRelay = makeLoadItem(fetchRelay, getRelay)
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export const deriveRelay = makeDeriveItem(relaysByUrl, loadRelay)
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export const displayRelayByPubkey = (url: string) =>
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displayRelayProfile(getRelay(url), displayRelayUrl(url))
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export const deriveRelayDisplay = (url: string) =>
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derived(deriveRelay(url), $relay => displayRelayProfile($relay, displayRelayUrl(url)))
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