fix tests, .seenOn() method for pools.

now pools are much smarter.

.github/workflows/npm-publish.yml

@@ -12,9 +12,10 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: 18
-      - run: yarn --ignore-engines
-      - run: node build.js
-      - run: yarn test
+      - uses: extractions/setup-just@v1
+      - run: just install-dependencies
+      - run: just build
+      - run: just test
       - uses: JS-DevTools/npm-publish@v1
         with:
           token: ${{ secrets.NPM_TOKEN }}

.github/workflows/test.yml

@@ -3,6 +3,7 @@ on:
   push:
     branches:
       - master
+  pull_request:
 
 jobs:
   test:
@@ -12,6 +13,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           node-version: 18
-      - run: yarn --ignore-engines
-      - run: node build.js
-      - run: yarn test
+      - uses: extractions/setup-just@v1
+      - run: just install-dependencies
+      - run: just build
+      - run: just test

README.md

@@ -2,7 +2,7 @@
 
 Tools for developing [Nostr](https://github.com/fiatjaf/nostr) clients.
 
-Very lean on dependencies.
+Only depends on _@scure_ and _@noble_ packages.
 
 ## Usage
 
@@ -30,11 +30,11 @@ let event = {
   kind: 1,
   created_at: Math.floor(Date.now() / 1000),
   tags: [],
-  content: 'hello'
+  content: 'hello',
+  pubkey: getPublicKey(privateKey)
 }
 
 event.id = getEventHash(event)
-event.pubkey = getPublicKey(privateKey)
 event.sig = signEvent(event, privateKey)
 
 let ok = validateEvent(event)
@@ -102,13 +102,18 @@ event.sig = signEvent(event, sk)
 
 let pub = relay.publish(event)
 pub.on('ok', () => {
-  console.log(`{relay.url} has accepted our event`)
+  console.log(`${relay.url} has accepted our event`)
 })
 pub.on('seen', () => {
-  console.log(`we saw the event on {relay.url}`)
+  console.log(`we saw the event on ${relay.url}`)
 })
 pub.on('failed', reason => {
-  console.log(`failed to publish to {relay.url}: ${reason}`)
+  console.log(`failed to publish to ${relay.url}: ${reason}`)
+})
+
+let events = await relay.list([{kinds: [0, 1]}])
+let event = await relay.get({
+  ids: ['44e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245']
 })
 
 await relay.close()
@@ -120,6 +125,46 @@ To use this on Node.js you first must install `websocket-polyfill` and import it
 import 'websocket-polyfill'
 ```
 
+### Interacting with multiple relays
+
+```js
+import {pool} from 'nostr-tools'
+
+const pool = new SimplePool()
+
+let relays = ['wss://relay.example.com', 'wss://relay.example2.com']
+
+let relay = await pool.ensureRelay('wss://relay.example3.com')
+
+let subs = pool.sub([...relays, relay], {
+  authors: ['32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245']
+})
+
+subs.forEach(sub =>
+  sub.on('event', event => {
+    // this will only be called once the first time the event is received
+    // ...
+  })
+)
+
+let pubs = pool.publish(relays, newEvent)
+pubs.forEach(pub =>
+  pub.on('ok', () => {
+    // ...
+  })
+)
+
+let events = await pool.list(relays, [{kinds: [0, 1]}])
+let event = await pool.get(relays, {
+  ids: ['44e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245']
+})
+
+let relaysForEvent = pool.seenOn(
+  '44e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245'
+)
+// relaysForEvent will be an array of URLs from relays a given event was seen on
+```
+
 ### Querying profile data from a NIP-05 address
 
 ```js
@@ -182,7 +227,7 @@ let pk2 = getPublicKey(sk2)
 
 // on the sender side
 let message = 'hello'
-let ciphertext = await nip04.encrypt(sk1, pk2, 'hello')
+let ciphertext = await nip04.encrypt(sk1, pk2, message)
 
 let event = {
   kind: 4,
@@ -195,8 +240,8 @@ let event = {
 sendEvent(event)
 
 // on the receiver side
-sub.on('event', (event) => {
-  let sender = event.tags.find(([k, v]) => k === 'p' && && v && v !== '')[1]
+sub.on('event', event => {
+  let sender = event.tags.find(([k, v]) => k === 'p' && v && v !== '')[1]
   pk1 === sender
   let plaintext = await nip04.decrypt(sk2, pk1, event.content)
 })

event.test.js

@@ -4,7 +4,6 @@ const {
   validateEvent,
   verifySignature,
   signEvent,
-  getEventHash,
   getPublicKey
 } = require('./lib/nostr.cjs')
 
@@ -35,15 +34,15 @@ test('validate event', () => {
 })
 
 test('check signature', async () => {
-  expect(await verifySignature(event)).toBeTruthy()
+  expect(verifySignature(event)).toBeTruthy()
 })
 
 test('sign event', async () => {
-  let sig = await signEvent(unsigned, privateKey)
-  let hash = getEventHash(unsigned)
   let pubkey = getPublicKey(privateKey)
+  let authored = {...unsigned, pubkey}
 
-  let signed = {...unsigned, id: hash, sig, pubkey}
+  let sig = signEvent(authored, privateKey)
+  let signed = {...authored, sig}
 
-  expect(await verifySignature(signed)).toBeTruthy()
+  expect(verifySignature(signed)).toBeTruthy()
 })

event.ts

@@ -3,7 +3,6 @@ import {sha256} from '@noble/hashes/sha256'
 
 import {utf8Encoder} from './utils'
 
-
 /* eslint-disable no-unused-vars */
 export enum Kind {
   Metadata = 0,
@@ -17,7 +16,7 @@ export enum Kind {
   ChannelMetadata = 41,
   ChannelMessage = 42,
   ChannelHideMessage = 43,
-  ChannelMuteUser = 44,
+  ChannelMuteUser = 44
 }
 
 export type Event = {
@@ -41,6 +40,9 @@ export function getBlankEvent(): Event {
 }
 
 export function serializeEvent(evt: Event): string {
+  if (!validateEvent(evt))
+    throw new Error("can't serialize event with wrong or missing properties")
+
   return JSON.stringify([
     0,
     evt.pubkey,
@@ -57,9 +59,10 @@ export function getEventHash(event: Event): string {
 }
 
 export function validateEvent(event: Event): boolean {
-  if (event.id !== getEventHash(event)) return false
   if (typeof event.content !== 'string') return false
   if (typeof event.created_at !== 'number') return false
+  if (typeof event.pubkey !== 'string') return false
+  if (!event.pubkey.match(/^[a-f0-9]{64}$/)) return false
 
   if (!Array.isArray(event.tags)) return false
   for (let i = 0; i < event.tags.length; i++) {
@@ -73,10 +76,12 @@ export function validateEvent(event: Event): boolean {
   return true
 }
 
-export function verifySignature(
-  event: Event & {id: string; sig: string}
-): boolean {
-  return secp256k1.schnorr.verifySync(event.sig, event.id, event.pubkey)
+export function verifySignature(event: Event & {sig: string}): boolean {
+  return secp256k1.schnorr.verifySync(
+    event.sig,
+    getEventHash(event),
+    event.pubkey
+  )
 }
 
 export function signEvent(event: Event, key: string): string {

fakejson.test.js

@@ -0,0 +1,49 @@
+/* eslint-env jest */
+
+const {fj} = require('./lib/nostr.cjs')
+
+test('match id', () => {
+  expect(
+    fj.matchEventId(
+      `["EVENT","nostril-query",{"tags":[],"content":"so did we cut all corners and p2p stuff in order to make a decentralized social network that was fast and worked, but in the end what we got was a lot of very slow clients that can't handle the traffic of one jack dorsey tweet?","sig":"ca62629d189edebb8f0811cfa0ac53015013df5f305dcba3f411ba15cfc4074d8c2d517ee7d9e81c9eb72a7328bfbe31c9122156397565ac55e740404e2b1fe7","id":"fef2a50f7d9d3d5a5f38ee761bc087ec16198d3f0140df6d1e8193abf7c2b146","kind":1,"pubkey":"3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d","created_at":1671150419}]`,
+      'fef2a50f7d9d3d5a5f38ee761bc087ec16198d3f0140df6d1e8193abf7c2b146'
+    )
+  ).toBeTruthy()
+
+  expect(
+    fj.matchEventId(
+      `["EVENT","nostril-query",{"content":"a bunch of mfs interacted with my post using what I assume were \"likes\": https://nostr.build/i/964.png","created_at":1672506879,"id":"f40bdd0905137ad60482537e260890ab50b0863bf16e67cf9383f203bd26c96f","kind":1,"pubkey":"3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d","sig":"8b825d2d4096f0643b18ca39da59ec07a682cd8a3e717f119c845037573d98099f5bea94ec7ddedd5600c8020144a255ed52882a911f7f7ada6d6abb3c0a1eb4","tags":[]}]`,
+      'fef2a50f7d9d3d5a5f38ee761bc087ec16198d3f0140df6d1e8193abf7c2b146'
+    )
+  ).toBeFalsy()
+})
+
+test('match kind', () => {
+  expect(
+    fj.matchEventKind(
+      `["EVENT","nostril-query",{"tags":[],"content":"so did we cut all corners and p2p stuff in order to make a decentralized social network that was fast and worked, but in the end what we got was a lot of very slow clients that can't handle the traffic of one jack dorsey tweet?","sig":"ca62629d189edebb8f0811cfa0ac53015013df5f305dcba3f411ba15cfc4074d8c2d517ee7d9e81c9eb72a7328bfbe31c9122156397565ac55e740404e2b1fe7","id":"fef2a50f7d9d3d5a5f38ee761bc087ec16198d3f0140df6d1e8193abf7c2b146","kind":1,"pubkey":"3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d","created_at":1671150419}]`,
+      1
+    )
+  ).toBeTruthy()
+
+  expect(
+    fj.matchEventKind(
+      `["EVENT","nostril-query",{"content":"{\"name\":\"fiatjaf\",\"about\":\"buy my merch at fiatjaf store\",\"picture\":\"https://fiatjaf.com/static/favicon.jpg\",\"nip05\":\"_@fiatjaf.com\"}","created_at":1671217411,"id":"b52f93f6dfecf9d81f59062827cd941412a0e8398dda60baf960b17499b88900","kind":12720,"pubkey":"3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d","sig":"fc1ea5d45fa5ed0526faed06e8fc7a558e60d1b213e9714f440828584ee999b93407092f9b04deea7e504fa034fc0428f31f7f0f95417b3280ebe6004b80b470","tags":[]}]`,
+      12720
+    )
+  ).toBeTruthy()
+})
+
+test('match subscription id', () => {
+  expect(fj.getSubscriptionId('["EVENT","",{}]')).toEqual('')
+  expect(fj.getSubscriptionId('["EVENT","_",{}]')).toEqual('_')
+  expect(fj.getSubscriptionId('["EVENT","subname",{}]')).toEqual('subname')
+  expect(fj.getSubscriptionId('["EVENT", "kasjbdjkav", {}]')).toEqual(
+    'kasjbdjkav'
+  )
+  expect(
+    fj.getSubscriptionId(
+      '  [ \n\n "EVENT"  , \n\n "y4d5ow45gfwoiudfÇA VSADLKAN KLDASB[12312535]SFMZSNJKLH" , {}]'
+    )
+  ).toEqual('y4d5ow45gfwoiudfÇA VSADLKAN KLDASB[12312535]SFMZSNJKLH')
+})

fakejson.ts

@@ -0,0 +1,41 @@
+export function getHex64(json: string, field: string): string {
+  let len = field.length + 3
+  let idx = json.indexOf(`"${field}":`) + len
+  let s = json.slice(idx).indexOf(`"`) + idx + 1
+  return json.slice(s, s + 64)
+}
+
+export function getInt(json: string, field: string): number {
+  let len = field.length
+  let idx = json.indexOf(`"${field}":`) + len + 3
+  let sliced = json.slice(idx)
+  let end = Math.min(sliced.indexOf(','), sliced.indexOf('}'))
+  return parseInt(sliced.slice(0, end), 10)
+}
+
+export function getSubscriptionId(json: string): string | null {
+  let idx = json.slice(0, 22).indexOf(`"EVENT"`)
+  if (idx === -1) return null
+
+  let pstart = json.slice(idx + 7 + 1).indexOf(`"`)
+  if (pstart === -1) return null
+  let start = idx + 7 + 1 + pstart
+
+  let pend = json.slice(start + 1, 80).indexOf(`"`)
+  if (pend === -1) return null
+  let end = start + 1 + pend
+
+  return json.slice(start + 1, end)
+}
+
+export function matchEventId(json: string, id: string): boolean {
+  return id === getHex64(json, 'id')
+}
+
+export function matchEventPubkey(json: string, pubkey: string): boolean {
+  return pubkey === getHex64(json, 'pubkey')
+}
+
+export function matchEventKind(json: string, kind: number): boolean {
+  return kind === getInt(json, 'kind')
+}

index.ts

@@ -2,6 +2,7 @@ export * from './keys'
 export * from './relay'
 export * from './event'
 export * from './filter'
+export * from './pool'
 
 export * as nip04 from './nip04'
 export * as nip05 from './nip05'
@@ -9,6 +10,9 @@ export * as nip06 from './nip06'
 export * as nip19 from './nip19'
 export * as nip26 from './nip26'
 
+export * as fj from './fakejson'
+export * as utils from './utils'
+
 // monkey patch secp256k1
 import * as secp256k1 from '@noble/secp256k1'
 import {hmac} from '@noble/hashes/hmac'

justfile

@@ -0,0 +1,16 @@
+export PATH := "./node_modules/.bin:" + env_var('PATH')
+
+install-dependencies:
+    yarn --ignore-engines
+
+build:
+    node build.js
+
+test: build
+    jest
+
+testOnly file: build
+    jest {{file}}
+
+publish: build
+    npm publish

magic.ts

@@ -0,0 +1,140 @@
+import {Relay, relayInit} from './relay'
+import {Event} from './event'
+import {normalizeURL} from './utils'
+
+export default function (
+  writeableRelays: string[],
+  fallbackRelays: string[],
+  safeRelays: string[]
+) {
+  return new MagicPool(fallbackRelays, writeableRelays, safeRelays)
+}
+
+class MagicPool {
+  private _conn: {[url: string]: Relay}
+  private _fallback: {[url: string]: Relay}
+  private _write: {[url: string]: Relay}
+  private _safe: {[url: string]: Relay}
+
+  private _profileRelays: {[pubkey: string]: RelayTableScore}
+  private _tempCache: {[id: string]: Event}
+
+  constructor(
+    fallbackRelays: string[],
+    writeableRelays: string[],
+    safeRelays: string[] = [
+      'wss://eden.nostr.land',
+      'wss://nostr.milou.lol',
+      'wss://relay.minds.com/nostr/v1/ws'
+    ]
+  ) {
+    this._conn = {}
+    this._write = {}
+    this._fallback = {}
+    this._profileRelays = {}
+    this._tempCache = {}
+
+    const hasEventId = (id: string): boolean => id in this._tempCache
+    const init = (url: string) => {
+      this._conn[normalizeURL(url)] = relayInit(normalizeURL(url), hasEventId)
+    }
+
+    fallbackRelays.forEach(init)
+    writeableRelays.forEach(init)
+    safeRelays.forEach(init)
+
+    this._write = Object.fromEntries(
+      writeableRelays.map(url => [
+        normalizeURL(url),
+        this._conn[normalizeURL(url)]
+      ])
+    )
+    this._fallback = Object.fromEntries(
+      fallbackRelays.map(url => [
+        normalizeURL(url),
+        this._conn[normalizeURL(url)]
+      ])
+    )
+    this._safe = Object.fromEntries(
+      safeRelays.map(url => [normalizeURL(url), this._conn[normalizeURL(url)]])
+    )
+  }
+
+  publish(event: Event) {
+    return Promise.all(
+      Object.entries(this._write).map(
+        ([url, relay]) =>
+          new Promise(async resolve => {
+            await relay.connect()
+            let pub = relay.publish(event)
+            let to = setTimeout(() => {
+              let end = setTimeout(() => {
+                resolve({url, success: false, reason: 'timeout'})
+              }, 2500)
+              pub.on('seen', () => {
+                clearTimeout(end)
+                resolve({url, success: true, reason: 'seen'})
+              })
+            }, 2500)
+            pub.on('ok', () => {
+              clearTimeout(to)
+              resolve({url, success: true, reason: 'ok'})
+            })
+            pub.on('failed', (reason: string) => {
+              clearTimeout(to)
+              resolve({url, success: false, reason})
+            })
+          })
+      )
+    )
+  }
+
+  profile(
+    pubkey: string,
+    onUpdate: (events: Event[]) => void
+  ): {
+    page(n: number): void
+  } {
+    var relays = new Set()
+    let rts = this._profileRelays[pubkey]
+    if (rts) {
+      relays = rts.get(3)
+    }
+
+    let fallback = Object.values(this._fallback)
+    for (let i = 0; i < fallback.length; i++) {
+      if (relays.size < 3) {
+        relays.add(fallback[Math.floor(Math.random() * fallback.length)])
+      } else break
+    }
+
+    // start subscription
+    for (let r in relays) {
+        r.
+    }
+
+    return {
+      page(n: number) {}
+    }
+  }
+}
+
+class RelayTableScore {
+  seen: string[] = []
+  hinted: string[] = []
+  explicit: string[] = []
+
+  get(n: number): Set<string> {
+    let relays = new Set<string>()
+    for (let i = 0; i < n; i++) {
+      for (let j = 0; j < 3; j++) {
+        let v = [this.seen, this.explicit, this.hinted][j][i]
+        if (v) {
+          relays.add(v)
+          if (relays.size >= n) return relays
+        }
+      }
+    }
+    return relays
+  }
+}

nip04.ts

@@ -1,6 +1,6 @@
 import {randomBytes} from '@noble/hashes/utils'
 import * as secp256k1 from '@noble/secp256k1'
-import {encode as b64encode, decode as b64decode} from 'base64-arraybuffer'
+import {base64} from '@scure/base'
 
 import {utf8Decoder, utf8Encoder} from './utils'
 
@@ -26,8 +26,8 @@ export async function encrypt(
     cryptoKey,
     plaintext
   )
-  let ctb64 = b64encode(ciphertext)
-  let ivb64 = b64encode(iv.buffer)
+  let ctb64 = base64.encode(new Uint8Array(ciphertext))
+  let ivb64 = base64.encode(new Uint8Array(iv.buffer))
 
   return `${ctb64}?iv=${ivb64}`
 }
@@ -48,8 +48,8 @@ export async function decrypt(
     false,
     ['decrypt']
   )
-  let ciphertext = b64decode(ctb64)
-  let iv = b64decode(ivb64)
+  let ciphertext = base64.decode(ctb64)
+  let iv = base64.decode(ivb64)
 
   let plaintext = await crypto.subtle.decrypt(
     {name: 'AES-CBC', iv},

nip05.ts

@@ -36,7 +36,7 @@ export async function queryProfile(
     name = '_'
   }
 
-  if (!name.match(/^[a-z0-9-_]+$/)) return null
+  if (!name.match(/^[A-Za-z0-9-_]+$/)) return null
 
   let res = await (
     await _fetch(`https://${domain}/.well-known/nostr.json?name=${name}`)

nip06.test.js

@@ -0,0 +1,15 @@
+/* eslint-env jest */
+const {nip06} = require('./lib/nostr.cjs')
+
+test('generate private key from a mnemonic', async () => {
+  const mnemonic = 'zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong'
+  const privateKey = nip06.privateKeyFromSeedWords(mnemonic)
+  expect(privateKey).toEqual('c26cf31d8ba425b555ca27d00ca71b5008004f2f662470f8c8131822ec129fe2')
+})
+
+test('generate private key from a mnemonic and passphrase', async () => {
+  const mnemonic = 'zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong'
+  const passphrase = '123'
+  const privateKey = nip06.privateKeyFromSeedWords(mnemonic, passphrase)
+  expect(privateKey).toEqual('55a22b8203273d0aaf24c22c8fbe99608e70c524b17265641074281c8b978ae4')
+})

nip06.ts

@@ -7,8 +7,8 @@ import {
 } from '@scure/bip39'
 import {HDKey} from '@scure/bip32'
 
-export function privateKeyFromSeedWords(mnemonic: string): string {
-  let root = HDKey.fromMasterSeed(mnemonicToSeedSync(mnemonic))
+export function privateKeyFromSeedWords(mnemonic: string, passphrase?: string): string {
+  let root = HDKey.fromMasterSeed(mnemonicToSeedSync(mnemonic, passphrase))
   let privateKey = root.derive(`m/44'/1237'/0'/0/0`).privateKey
   if (!privateKey) throw new Error('could not derive private key')
   return secp256k1.utils.bytesToHex(privateKey)

nip19.ts

@@ -1,8 +1,10 @@
 import * as secp256k1 from '@noble/secp256k1'
-import {bech32} from 'bech32'
+import {bech32} from '@scure/base'
 
 import {utf8Decoder, utf8Encoder} from './utils'
 
+const Bech32MaxSize = 5000
+
 export type ProfilePointer = {
   pubkey: string // hex
   relays?: string[]
@@ -17,7 +19,7 @@ export function decode(nip19: string): {
   type: string
   data: ProfilePointer | EventPointer | string
 } {
-  let {prefix, words} = bech32.decode(nip19, 1000)
+  let {prefix, words} = bech32.decode(nip19, Bech32MaxSize)
   let data = new Uint8Array(bech32.fromWords(words))
 
   if (prefix === 'nprofile') {
@@ -87,7 +89,7 @@ export function noteEncode(hex: string): string {
 function encodeBytes(prefix: string, hex: string): string {
   let data = secp256k1.utils.hexToBytes(hex)
   let words = bech32.toWords(data)
-  return bech32.encode(prefix, words, 1000)
+  return bech32.encode(prefix, words, Bech32MaxSize)
 }
 
 export function nprofileEncode(profile: ProfilePointer): string {
@@ -96,7 +98,7 @@ export function nprofileEncode(profile: ProfilePointer): string {
     1: (profile.relays || []).map(url => utf8Encoder.encode(url))
   })
   let words = bech32.toWords(data)
-  return bech32.encode('nprofile', words, 1000)
+  return bech32.encode('nprofile', words, Bech32MaxSize)
 }
 
 export function neventEncode(event: EventPointer): string {
@@ -105,7 +107,7 @@ export function neventEncode(event: EventPointer): string {
     1: (event.relays || []).map(url => utf8Encoder.encode(url))
   })
   let words = bech32.toWords(data)
-  return bech32.encode('nevent', words, 1000)
+  return bech32.encode('nevent', words, Bech32MaxSize)
 }
 
 function encodeTLV(tlv: TLV): Uint8Array {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nostr-tools",
-  "version": "1.0.1",
+  "version": "1.3.2",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",
@@ -11,10 +11,9 @@
   "dependencies": {
     "@noble/hashes": "^0.5.7",
     "@noble/secp256k1": "^1.7.0",
+    "@scure/base": "^1.1.1",
     "@scure/bip32": "^1.1.1",
-    "@scure/bip39": "^1.1.0",
-    "base64-arraybuffer": "^1.0.2",
-    "bech32": "^2.0.0"
+    "@scure/bip39": "^1.1.0"
   },
   "keywords": [
     "decentralization",
@@ -39,10 +38,5 @@
     "tsd": "^0.22.0",
     "typescript": "^4.9.4",
     "websocket-polyfill": "^0.0.3"
-  },
-  "scripts": {
-    "build": "node build.js",
-    "pretest": "node build.js",
-    "test": "jest"
   }
 }

pool.test.js

@@ -0,0 +1,133 @@
+/* eslint-env jest */
+
+require('websocket-polyfill')
+const {
+  SimplePool,
+  generatePrivateKey,
+  getPublicKey,
+  getEventHash,
+  signEvent
+} = require('./lib/nostr.cjs')
+
+let pool = new SimplePool()
+
+let relays = [
+  'wss://nostr-dev.wellorder.net/',
+  'wss://relay.nostr.bg/',
+  'wss://nostr.fmt.wiz.biz/',
+  'wss://relay.nostr.band/',
+  'wss://nostr.zebedee.cloud/'
+]
+
+afterAll(async () => {
+  await pool.close([
+    ...relays,
+    'wss://nostr-relay.untethr.me',
+    'wss://offchain.pub',
+    'wss://eden.nostr.land'
+  ])
+})
+
+test('removing duplicates when querying', async () => {
+  let priv = generatePrivateKey()
+  let pub = getPublicKey(priv)
+
+  let sub = pool.sub(relays, [{authors: [pub]}])
+  let received = []
+
+  sub.on('event', event => {
+    // this should be called only once even though we're listening
+    // to multiple relays because the events will be catched and
+    // deduplicated efficiently (without even being parsed)
+    received.push(event)
+  })
+
+  let event = {
+    pubkey: pub,
+    created_at: Math.round(Date.now() / 1000),
+    content: 'test',
+    kind: 22345,
+    tags: []
+  }
+  event.id = getEventHash(event)
+  event.sig = signEvent(event, priv)
+
+  pool.publish(relays, event)
+
+  await new Promise(resolve => setTimeout(resolve, 1500))
+
+  expect(received).toHaveLength(1)
+})
+
+test('same with double querying', async () => {
+  let priv = generatePrivateKey()
+  let pub = getPublicKey(priv)
+
+  let sub1 = pool.sub(relays, [{authors: [pub]}])
+  let sub2 = pool.sub(relays, [{authors: [pub]}])
+
+  let received = []
+
+  sub1.on('event', event => {
+    received.push(event)
+  })
+
+  sub2.on('event', event => {
+    received.push(event)
+  })
+
+  let event = {
+    pubkey: pub,
+    created_at: Math.round(Date.now() / 1000),
+    content: 'test2',
+    kind: 22346,
+    tags: []
+  }
+  event.id = getEventHash(event)
+  event.sig = signEvent(event, priv)
+
+  pool.publish(relays, event)
+
+  await new Promise(resolve => setTimeout(resolve, 1500))
+
+  expect(received).toHaveLength(2)
+})
+
+test('get()', async () => {
+  let event = await pool.get(relays, {
+    ids: ['d7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027']
+  })
+
+  expect(event).toHaveProperty(
+    'id',
+    'd7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027'
+  )
+})
+
+test('list()', async () => {
+  let events = await pool.list(
+    [...relays, 'wss://offchain.pub', 'wss://eden.nostr.land'],
+    [
+      {
+        authors: [
+          '3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d'
+        ],
+        kinds: [1],
+        limit: 2
+      }
+    ]
+  )
+
+  // the actual received number will be greater than 2, but there will be no duplicates
+  expect(events.length).toEqual(
+    events
+      .map(evt => evt.id)
+      .reduce((acc, n) => (acc.indexOf(n) !== -1 ? acc : [...acc, n]), [])
+      .length
+  )
+
+  let relaysForAllEvents = events
+    .map(event => pool.seenOn(event.id))
+    .reduce((acc, n) => acc.concat(n), [])
+  expect(relaysForAllEvents.length).toBeGreaterThanOrEqual(events.length)
+})

pool.ts

@@ -0,0 +1,167 @@
+import {Relay, relayInit} from './relay'
+import {normalizeURL} from './utils'
+import {Filter} from './filter'
+import {Event} from './event'
+import {SubscriptionOptions, Sub, Pub} from './relay'
+
+export class SimplePool {
+  private _conn: {[url: string]: Relay}
+  private _seenOn: {[id: string]: Set<string>} = {} // a map of all events we've seen in each relay
+
+  constructor() {
+    this._conn = {}
+  }
+
+  async close(relays: string[]): Promise<void> {
+    await Promise.all(
+      relays.map(async url => {
+        let relay = this._conn[normalizeURL(url)]
+        if (relay) await relay.close()
+      })
+    )
+  }
+
+  async ensureRelay(url: string): Promise<Relay> {
+    const nm = normalizeURL(url)
+    const existing = this._conn[nm]
+    if (existing) return existing
+
+    const relay = relayInit(nm)
+    this._conn[nm] = relay
+
+    await relay.connect()
+
+    return relay
+  }
+
+  sub(relays: string[], filters: Filter[], opts?: SubscriptionOptions): Sub {
+    let _knownIds: Set<string> = new Set()
+    let modifiedOpts = opts || {}
+    modifiedOpts.alreadyHaveEvent = (id, url) => {
+      let set = this._seenOn[id] || new Set()
+      set.add(url)
+      this._seenOn[id] = set
+      return _knownIds.has(id)
+    }
+
+    let subs: Sub[] = []
+    let eventListeners: Set<(event: Event) => void> = new Set()
+    let eoseListeners: Set<() => void> = new Set()
+    let eosesMissing = relays.length
+
+    let eoseSent = false
+    let eoseTimeout = setTimeout(() => {
+      eoseSent = true
+      for (let cb of eoseListeners.values()) cb()
+    }, 2400)
+
+    relays.forEach(async relay => {
+      let r = await this.ensureRelay(relay)
+      if (!r) return
+      let s = r.sub(filters, modifiedOpts)
+      s.on('event', (event: Event) => {
+        _knownIds.add(event.id as string)
+        for (let cb of eventListeners.values()) cb(event)
+      })
+      s.on('eose', () => {
+        if (eoseSent) return
+
+        eosesMissing--
+        if (eosesMissing === 0) {
+          clearTimeout(eoseTimeout)
+          for (let cb of eoseListeners.values()) cb()
+        }
+      })
+      subs.push(s)
+    })
+
+    let greaterSub: Sub = {
+      sub(filters, opts) {
+        subs.forEach(sub => sub.sub(filters, opts))
+        return greaterSub
+      },
+      unsub() {
+        subs.forEach(sub => sub.unsub())
+      },
+      on(type, cb) {
+        switch (type) {
+          case 'event':
+            eventListeners.add(cb)
+            break
+          case 'eose':
+            eoseListeners.add(cb)
+            break
+        }
+      },
+      off(type, cb) {
+        if (type === 'event') {
+          eventListeners.delete(cb)
+        } else if (type === 'eose') eoseListeners.delete(cb)
+      }
+    }
+
+    return greaterSub
+  }
+
+  get(
+    relays: string[],
+    filter: Filter,
+    opts?: SubscriptionOptions
+  ): Promise<Event | null> {
+    return new Promise(resolve => {
+      let sub = this.sub(relays, [filter], opts)
+      let timeout = setTimeout(() => {
+        sub.unsub()
+        resolve(null)
+      }, 1500)
+      sub.on('event', (event: Event) => {
+        resolve(event)
+        clearTimeout(timeout)
+        sub.unsub()
+      })
+    })
+  }
+
+  list(
+    relays: string[],
+    filters: Filter[],
+    opts?: SubscriptionOptions
+  ): Promise<Event[]> {
+    return new Promise(resolve => {
+      let events: Event[] = []
+      let sub = this.sub(relays, filters, opts)
+
+      sub.on('event', (event: Event) => {
+        events.push(event)
+      })
+
+      // we can rely on an eose being emitted here because pool.sub() will fake one
+      sub.on('eose', () => {
+        sub.unsub()
+        resolve(events)
+      })
+    })
+  }
+
+  publish(relays: string[], event: Event): Pub[] {
+    return relays.map(relay => {
+      let r = this._conn[normalizeURL(relay)]
+      if (!r) return badPub(relay)
+      let s = r.publish(event)
+      return s
+    })
+  }
+
+  seenOn(id: string): string[] {
+    return Array.from(this._seenOn[id]?.values?.() || [])
+  }
+}
+
+function badPub(relay: string): Pub {
+  return {
+    on(typ, cb) {
+      if (typ === 'failed') cb(`relay ${relay} not connected`)
+    },
+    off() {}
+  }
+}

relay.test.js

@@ -32,7 +32,7 @@ test('connectivity', () => {
   ).resolves.toBe(true)
 })
 
-test('querying', () => {
+test('querying', async () => {
   var resolve1
   var resolve2
 
@@ -52,8 +52,7 @@ test('querying', () => {
     resolve2(true)
   })
 
-  return expect(
-    Promise.all([
+  let [t1, t2] = await Promise.all([
     new Promise(resolve => {
       resolve1 = resolve
     }),
@@ -61,7 +60,34 @@ test('querying', () => {
       resolve2 = resolve
     })
   ])
-  ).resolves.toEqual([true, true])
+
+  expect(t1).toEqual(true)
+  expect(t2).toEqual(true)
+})
+
+test('get()', async () => {
+  let event = await relay.get({
+    ids: ['d7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027']
+  })
+
+  expect(event).toHaveProperty(
+    'id',
+    'd7dd5eb3ab747e16f8d0212d53032ea2a7cadef53837e5a6c66d42849fcb9027'
+  )
+})
+
+test('list()', async () => {
+  let events = await relay.list([
+    {
+      authors: [
+        '3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d'
+      ],
+      kinds: [1],
+      limit: 2
+    }
+  ])
+
+  expect(events.length).toEqual(2)
 })
 
 test('listening (twice) and publishing', async () => {
@@ -98,7 +124,7 @@ test('listening (twice) and publishing', async () => {
     content: 'nostr-tools test suite'
   }
   event.id = getEventHash(event)
-  event.sig = await signEvent(event, sk)
+  event.sig = signEvent(event, sk)
 
   relay.publish(event)
   return expect(

relay.ts

@@ -2,6 +2,7 @@
 
 import {Event, verifySignature, validateEvent} from './event'
 import {Filter, matchFilters} from './filter'
+import {getHex64, getSubscriptionId} from './fakejson'
 
 type RelayEvent = 'connect' | 'disconnect' | 'error' | 'notice'
 
@@ -11,6 +12,8 @@ export type Relay = {
   connect: () => Promise<void>
   close: () => Promise<void>
   sub: (filters: Filter[], opts?: SubscriptionOptions) => Sub
+  list: (filters: Filter[], opts?: SubscriptionOptions) => Promise<Event[]>
+  get: (filter: Filter, opts?: SubscriptionOptions) => Promise<Event | null>
   publish: (event: Event) => Pub
   on: (type: RelayEvent, cb: any) => void
   off: (type: RelayEvent, cb: any) => void
@@ -26,15 +29,19 @@ export type Sub = {
   off: (type: 'event' | 'eose', cb: any) => void
 }
 
-type SubscriptionOptions = {
-  skipVerification?: boolean
+export type SubscriptionOptions = {
   id?: string
+  skipVerification?: boolean
+  alreadyHaveEvent?: null | ((id: string, relay: string) => boolean)
 }
 
 export function relayInit(url: string): Relay {
   var ws: WebSocket
   var resolveClose: () => void
-  var untilOpen: Promise<void>
+  var setOpen: (value: PromiseLike<void> | void) => void
+  var untilOpen = new Promise<void>(resolve => {
+    setOpen = resolve
+  })
   var openSubs: {[id: string]: {filters: Filter[]} & SubscriptionOptions} = {}
   var listeners: {
     connect: Array<() => void>
@@ -67,6 +74,7 @@ export function relayInit(url: string): Relay {
 
       ws.onopen = () => {
         listeners.connect.forEach(cb => cb())
+        setOpen()
         resolve()
       }
       ws.onerror = () => {
@@ -78,19 +86,46 @@ export function relayInit(url: string): Relay {
         resolveClose && resolveClose()
       }
 
-      ws.onmessage = async e => {
-        var data
-        try {
-          data = JSON.parse(e.data)
-        } catch (err) {
-          data = e.data
+      let incomingMessageQueue: string[] = []
+      let handleNextInterval: any
+
+      ws.onmessage = e => {
+        incomingMessageQueue.push(e.data)
+        if (!handleNextInterval) {
+          handleNextInterval = setInterval(handleNext, 0)
+        }
       }
 
-        if (data.length >= 1) {
+      function handleNext() {
+        if (incomingMessageQueue.length === 0) {
+          clearInterval(handleNextInterval)
+          handleNextInterval = null
+          return
+        }
+
+        var json = incomingMessageQueue.shift()
+        if (!json) return
+
+        let subid = getSubscriptionId(json)
+        if (subid) {
+          let so = openSubs[subid]
+          if (
+            so &&
+            so.alreadyHaveEvent &&
+            so.alreadyHaveEvent(getHex64(json, 'id'), url)
+          ) {
+            return
+          }
+        }
+
+        try {
+          let data = JSON.parse(json)
+
+          // we won't do any checks against the data since all failures (i.e. invalid messages from relays)
+          // will naturally be caught by the encompassing try..catch block
+
           switch (data[0]) {
             case 'EVENT':
-              if (data.length !== 3) return // ignore empty or malformed EVENT
-
               let id = data[1]
               let event = data[2]
               if (
@@ -104,13 +139,11 @@ export function relayInit(url: string): Relay {
               }
               return
             case 'EOSE': {
-              if (data.length !== 2) return // ignore empty or malformed EOSE
               let id = data[1]
               ;(subListeners[id]?.eose || []).forEach(cb => cb())
               return
             }
             case 'OK': {
-              if (data.length < 3) return // ignore empty or malformed OK
               let id: string = data[1]
               let ok: boolean = data[2]
               let reason: string = data[3] || ''
@@ -119,11 +152,12 @@ export function relayInit(url: string): Relay {
               return
             }
             case 'NOTICE':
-              if (data.length !== 2) return // ignore empty or malformed NOTICE
               let notice = data[1]
               listeners.notice.forEach(cb => cb(notice))
               return
           }
+        } catch (err) {
+          return
         }
       }
     })
@@ -138,13 +172,18 @@ export function relayInit(url: string): Relay {
     let msg = JSON.stringify(params)
 
     await untilOpen
+    try {
       ws.send(msg)
+    } catch (err) {
+      console.log(err)
+    }
   }
 
   const sub = (
     filters: Filter[],
     {
       skipVerification = false,
+      alreadyHaveEvent = null,
       id = Math.random().toString().slice(2)
     }: SubscriptionOptions = {}
   ): Sub => {
@@ -153,7 +192,8 @@ export function relayInit(url: string): Relay {
     openSubs[subid] = {
       id: subid,
       filters,
-      skipVerification
+      skipVerification,
+      alreadyHaveEvent
     }
     trySend(['REQ', subid, ...filters])
 
@@ -161,6 +201,7 @@ export function relayInit(url: string): Relay {
       sub: (newFilters, newOpts = {}) =>
         sub(newFilters || filters, {
           skipVerification: newOpts.skipVerification || skipVerification,
+          alreadyHaveEvent: newOpts.alreadyHaveEvent || alreadyHaveEvent,
           id: subid
         }),
       unsub: () => {
@@ -186,22 +227,46 @@ export function relayInit(url: string): Relay {
   return {
     url,
     sub,
-    on: (
-      type: RelayEvent,
-      cb: any
-    ): void => {
+    on: (type: RelayEvent, cb: any): void => {
       listeners[type].push(cb)
       if (type === 'connect' && ws?.readyState === 1) {
         cb()
       }
     },
-    off: (
-      type: RelayEvent,
-      cb: any
-    ): void => {
+    off: (type: RelayEvent, cb: any): void => {
       let index = listeners[type].indexOf(cb)
       if (index !== -1) listeners[type].splice(index, 1)
     },
+    list: (filters: Filter[], opts?: SubscriptionOptions): Promise<Event[]> =>
+      new Promise(resolve => {
+        let s = sub(filters, opts)
+        let events: Event[] = []
+        let timeout = setTimeout(() => {
+          s.unsub()
+          resolve(events)
+        }, 1500)
+        s.on('eose', () => {
+          s.unsub()
+          clearTimeout(timeout)
+          resolve(events)
+        })
+        s.on('event', (event: Event) => {
+          events.push(event)
+        })
+      }),
+    get: (filter: Filter, opts?: SubscriptionOptions): Promise<Event | null> =>
+      new Promise(resolve => {
+        let s = sub([filter], opts)
+        let timeout = setTimeout(() => {
+          s.unsub()
+          resolve(null)
+        }, 1500)
+        s.on('event', (event: Event) => {
+          s.unsub()
+          clearTimeout(timeout)
+          resolve(event)
+        })
+      }),
     publish(event: Event): Pub {
       if (!event.id) throw new Error(`event ${event} has no id`)
       let id = event.id
@@ -259,6 +324,7 @@ export function relayInit(url: string): Relay {
     },
     connect,
     close(): Promise<void> {
+      if (ws.readyState > 1) return Promise.resolve()
       ws.close()
       return new Promise<void>(resolve => {
         resolveClose = resolve

utils.test.js

@@ -0,0 +1,183 @@
+/* eslint-env jest */
+
+const {utils} = require('./lib/nostr.cjs')
+
+const {insertEventIntoAscendingList, insertEventIntoDescendingList} = utils
+
+describe('inserting into a desc sorted list of events', () => {
+  test('insert into an empty list', async () => {
+    const list0 = []
+    expect(
+      insertEventIntoDescendingList(list0, {id: 'abc', created_at: 10})
+    ).toHaveLength(1)
+  })
+
+  test('insert in the beginning of a list', async () => {
+    const list0 = [{created_at: 20}, {created_at: 10}]
+    const list1 = insertEventIntoDescendingList(list0, {
+      id: 'abc',
+      created_at: 30
+    })
+    expect(list1).toHaveLength(3)
+    expect(list1[0].id).toBe('abc')
+  })
+
+  test('insert in the beginning of a list with same created_at', async () => {
+    const list0 = [{created_at: 30}, {created_at: 20}, {created_at: 10}]
+    const list1 = insertEventIntoDescendingList(list0, {
+      id: 'abc',
+      created_at: 30
+    })
+    expect(list1).toHaveLength(4)
+    expect(list1[0].id).toBe('abc')
+  })
+
+  test('insert in the middle of a list', async () => {
+    const list0 = [
+      {created_at: 30},
+      {created_at: 20},
+      {created_at: 10},
+      {created_at: 1}
+    ]
+    const list1 = insertEventIntoDescendingList(list0, {
+      id: 'abc',
+      created_at: 15
+    })
+    expect(list1).toHaveLength(5)
+    expect(list1[2].id).toBe('abc')
+  })
+
+  test('insert in the end of a list', async () => {
+    const list0 = [
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 10}
+    ]
+    const list1 = insertEventIntoDescendingList(list0, {
+      id: 'abc',
+      created_at: 5
+    })
+    expect(list1).toHaveLength(6)
+    expect(list1.slice(-1)[0].id).toBe('abc')
+  })
+
+  test('insert in the last-to-end of a list with same created_at', async () => {
+    const list0 = [
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 10}
+    ]
+    const list1 = insertEventIntoDescendingList(list0, {
+      id: 'abc',
+      created_at: 10
+    })
+    expect(list1).toHaveLength(6)
+    expect(list1.slice(-2)[0].id).toBe('abc')
+  })
+
+  test('do not insert duplicates', async () => {
+    const list0 = [
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 10, id: 'abc'}
+    ]
+    const list1 = insertEventIntoDescendingList(list0, {
+      id: 'abc',
+      created_at: 10
+    })
+    expect(list1).toHaveLength(3)
+  })
+})
+
+describe('inserting into a asc sorted list of events', () => {
+  test('insert into an empty list', async () => {
+    const list0 = []
+    expect(
+      insertEventIntoAscendingList(list0, {id: 'abc', created_at: 10})
+    ).toHaveLength(1)
+  })
+
+  test('insert in the beginning of a list', async () => {
+    const list0 = [{created_at: 10}, {created_at: 20}]
+    const list1 = insertEventIntoAscendingList(list0, {
+      id: 'abc',
+      created_at: 1
+    })
+    expect(list1).toHaveLength(3)
+    expect(list1[0].id).toBe('abc')
+  })
+
+  test('insert in the beginning of a list with same created_at', async () => {
+    const list0 = [{created_at: 10}, {created_at: 20}, {created_at: 30}]
+    const list1 = insertEventIntoAscendingList(list0, {
+      id: 'abc',
+      created_at: 10
+    })
+    expect(list1).toHaveLength(4)
+    expect(list1[0].id).toBe('abc')
+  })
+
+  test('insert in the middle of a list', async () => {
+    const list0 = [
+      {created_at: 10},
+      {created_at: 20},
+      {created_at: 30},
+      {created_at: 40}
+    ]
+    const list1 = insertEventIntoAscendingList(list0, {
+      id: 'abc',
+      created_at: 25
+    })
+    expect(list1).toHaveLength(5)
+    expect(list1[2].id).toBe('abc')
+  })
+
+  test('insert in the end of a list', async () => {
+    const list0 = [
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 40}
+    ]
+    const list1 = insertEventIntoAscendingList(list0, {
+      id: 'abc',
+      created_at: 50
+    })
+    expect(list1).toHaveLength(6)
+    expect(list1.slice(-1)[0].id).toBe('abc')
+  })
+
+  test('insert in the last-to-end of a list with same created_at', async () => {
+    const list0 = [
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 30}
+    ]
+    const list1 = insertEventIntoAscendingList(list0, {
+      id: 'abc',
+      created_at: 30
+    })
+    expect(list1).toHaveLength(6)
+    expect(list1.slice(-2)[0].id).toBe('abc')
+  })
+
+  test('do not insert duplicates', async () => {
+    const list0 = [
+      {created_at: 20},
+      {created_at: 20},
+      {created_at: 30, id: 'abc'}
+    ]
+    const list1 = insertEventIntoAscendingList(list0, {
+      id: 'abc',
+      created_at: 30
+    })
+    expect(list1).toHaveLength(3)
+  })
+})

utils.ts

@@ -1,2 +1,111 @@
+import {Event} from './event'
+
 export const utf8Decoder = new TextDecoder('utf-8')
 export const utf8Encoder = new TextEncoder()
+
+export function normalizeURL(url: string): string {
+  let p = new URL(url)
+  p.pathname = p.pathname.replace(/\/+/g, '/')
+  if (p.pathname.endsWith('/')) p.pathname = p.pathname.slice(0, -1)
+  if (
+    (p.port === '80' && p.protocol === 'ws:') ||
+    (p.port === '443' && p.protocol === 'wss:')
+  )
+    p.port = ''
+  p.searchParams.sort()
+  p.hash = ''
+  return p.toString()
+}
+
+//
+// fast insert-into-sorted-array functions adapted from https://github.com/terrymorse58/fast-sorted-array
+//
+export function insertEventIntoDescendingList(
+  sortedArray: Event[],
+  event: Event
+) {
+  let start = 0
+  let end = sortedArray.length - 1
+  let midPoint
+  let position = start
+
+  if (end < 0) {
+    position = 0
+  } else if (event.created_at < sortedArray[end].created_at) {
+    position = end + 1
+  } else if (event.created_at >= sortedArray[start].created_at) {
+    position = start
+  } else
+    while (true) {
+      if (end <= start + 1) {
+        position = end
+        break
+      }
+      midPoint = Math.floor(start + (end - start) / 2)
+      if (sortedArray[midPoint].created_at > event.created_at) {
+        start = midPoint
+      } else if (sortedArray[midPoint].created_at < event.created_at) {
+        end = midPoint
+      } else {
+        // aMidPoint === num
+        position = midPoint
+        break
+      }
+    }
+
+  // insert when num is NOT already in (no duplicates)
+  if (sortedArray[position]?.id !== event.id) {
+    return [
+      ...sortedArray.slice(0, position),
+      event,
+      ...sortedArray.slice(position)
+    ]
+  }
+
+  return sortedArray
+}
+
+export function insertEventIntoAscendingList(
+  sortedArray: Event[],
+  event: Event
+) {
+  let start = 0
+  let end = sortedArray.length - 1
+  let midPoint
+  let position = start
+
+  if (end < 0) {
+    position = 0
+  } else if (event.created_at > sortedArray[end].created_at) {
+    position = end + 1
+  } else if (event.created_at <= sortedArray[start].created_at) {
+    position = start
+  } else
+    while (true) {
+      if (end <= start + 1) {
+        position = end
+        break
+      }
+      midPoint = Math.floor(start + (end - start) / 2)
+      if (sortedArray[midPoint].created_at < event.created_at) {
+        start = midPoint
+      } else if (sortedArray[midPoint].created_at > event.created_at) {
+        end = midPoint
+      } else {
+        // aMidPoint === num
+        position = midPoint
+        break
+      }
+    }
+
+  // insert when num is NOT already in (no duplicates)
+  if (sortedArray[position]?.id !== event.id) {
+    return [
+      ...sortedArray.slice(0, position),
+      event,
+      ...sortedArray.slice(position)
+    ]
+  }
+
+  return sortedArray
+}