Use custom relay API (#1302)

* Use custom relay API

Relay from nostr-tools was cumbersome to use. This custom abstraction over window.WebSocket makes interacting with nostr relays easier.

* Use variables for nostr message parts

* Fix NWC save

* Use try/finally

* Refactor crossposting code

* use custom replay API
* simplify callWithTimeout

* Use isomorphic-ws for nip57 zap receipts

* Use async map

* Reject with timeout error

* Move time functions into lib/time

* Remove outdated comment regarding relay.close()

components/nostr-auth.js

@@ -8,7 +8,7 @@ import { useRouter } from 'next/router'
 import AccordianItem from './accordian-item'
 import BackIcon from '@/svgs/arrow-left-line.svg'
 import styles from './lightning-auth.module.css'
-import { callWithTimeout } from '@/lib/nostr'
+import { callWithTimeout } from '@/lib/time'
 
 function ExtensionError ({ message, details }) {
   return (

components/use-crossposter.js

@@ -1,7 +1,8 @@
 import { useCallback } from 'react'
 import { useToast } from './toast'
 import { Button } from 'react-bootstrap'
-import { DEFAULT_CROSSPOSTING_RELAYS, crosspost, callWithTimeout } from '@/lib/nostr'
+import { DEFAULT_CROSSPOSTING_RELAYS, crosspost } from '@/lib/nostr'
+import { callWithTimeout } from '@/lib/time'
 import { gql, useMutation, useQuery, useLazyQuery } from '@apollo/client'
 import { SETTINGS } from '@/fragments/users'
 import { ITEM_FULL_FIELDS, POLL_FIELDS } from '@/fragments/items'

lib/nostr.js

@@ -1,5 +1,7 @@
 import { bech32 } from 'bech32'
 import { nip19 } from 'nostr-tools'
+import WebSocket from 'isomorphic-ws'
+import { callWithTimeout, withTimeout } from '@/lib/time'
 
 export const NOSTR_PUBKEY_HEX = /^[0-9a-fA-F]{64}$/
 export const NOSTR_PUBKEY_BECH32 = /^npub1[02-9ac-hj-np-z]+$/
@@ -15,6 +17,149 @@ export const DEFAULT_CROSSPOSTING_RELAYS = [
   'wss://relay.mutinywallet.com/'
 ]
 
+export class Relay {
+  constructor (relayUrl) {
+    const ws = new WebSocket(relayUrl)
+
+    ws.onmessage = function (msg) {
+      const [type, notice] = JSON.parse(msg.data)
+      if (type === 'NOTICE') {
+        console.log('relay notice:', notice)
+      }
+    }
+
+    ws.onerror = function (err) {
+      console.error('websocket error: ' + err)
+      this.error = err
+    }
+
+    this.ws = ws
+  }
+
+  static async connect (url, { timeout } = {}) {
+    const relay = new Relay(url)
+    await relay.waitUntilConnected({ timeout })
+    return relay
+  }
+
+  get connected () {
+    return this.ws.readyState === WebSocket.OPEN
+  }
+
+  get closed () {
+    return this.ws.readyState === WebSocket.CLOSING || this.ws.readyState === WebSocket.CLOSED
+  }
+
+  async waitUntilConnected ({ timeout } = {}) {
+    let interval
+
+    const checkPromise = new Promise((resolve, reject) => {
+      interval = setInterval(() => {
+        if (this.connected) {
+          resolve()
+        }
+        if (this.closed) {
+          reject(new Error(`failed to connect to ${this.url}: ` + this.error))
+        }
+      }, 100)
+    })
+
+    try {
+      return await withTimeout(checkPromise, timeout)
+    } finally {
+      clearInterval(interval)
+    }
+  }
+
+  close () {
+    const state = this.ws.readyState
+    if (state !== WebSocket.CLOSING && state !== WebSocket.CLOSED) {
+      this.ws.close()
+    }
+  }
+
+  async publish (event, { timeout } = {}) {
+    const ws = this.ws
+
+    let listener
+    const ackPromise = new Promise((resolve, reject) => {
+      ws.send(JSON.stringify(['EVENT', event]))
+
+      listener = function onmessage (msg) {
+        const [type, eventId, accepted, reason] = JSON.parse(msg.data)
+
+        if (type !== 'OK' || eventId !== event.id) return
+
+        if (accepted) {
+          resolve(eventId)
+        } else {
+          reject(new Error(reason || `event rejected: ${eventId}`))
+        }
+      }
+
+      ws.addEventListener('message', listener)
+    })
+
+    try {
+      return await withTimeout(ackPromise, timeout)
+    } finally {
+      ws.removeEventListener('message', listener)
+    }
+  }
+
+  async fetch (filter, { timeout } = {}) {
+    const ws = this.ws
+
+    let listener
+    const ackPromise = new Promise((resolve, reject) => {
+      const id = crypto.randomUUID()
+
+      ws.send(JSON.stringify(['REQ', id, ...filter]))
+
+      const events = []
+      let eose = false
+
+      listener = function onmessage (msg) {
+        const [type, eventId, event] = JSON.parse(msg.data)
+
+        if (eventId !== id) return
+
+        if (type === 'EVENT') {
+          events.push(event)
+          if (eose) {
+            // EOSE was already received:
+            // return first event after EOSE
+            resolve(events)
+          }
+          return
+        }
+
+        if (type === 'CLOSED') {
+          return resolve(events)
+        }
+
+        if (type === 'EOSE') {
+          eose = true
+          if (events.length > 0) {
+            // we already received events before EOSE:
+            // return all events before EOSE
+            ws.send(JSON.stringify(['CLOSE', id]))
+            return resolve(events)
+          }
+        }
+      }
+
+      ws.addEventListener('message', listener)
+    })
+
+    try {
+      return await withTimeout(ackPromise, timeout)
+    } finally {
+      ws.removeEventListener('message', listener)
+    }
+  }
+}
+
 export function hexToBech32 (hex, prefix = 'npub') {
   return bech32.encode(prefix, bech32.toWords(Buffer.from(hex, 'hex')))
 }
@@ -36,51 +181,10 @@ export function nostrZapDetails (zap) {
   return { npub, content, note }
 }
 
-async function publishNostrEvent (signedEvent, relay) {
-  return new Promise((resolve, reject) => {
+async function publishNostrEvent (signedEvent, relayUrl) {
   const timeout = 3000
-    const wsRelay = new window.WebSocket(relay)
-    let timer
-    let isMessageSentSuccessfully = false
-
-    function timedout () {
-      clearTimeout(timer)
-      wsRelay.close()
-      reject(new Error(`relay timeout for ${relay}`))
-    }
-
-    timer = setTimeout(timedout, timeout)
-
-    wsRelay.onopen = function () {
-      clearTimeout(timer)
-      timer = setTimeout(timedout, timeout)
-      wsRelay.send(JSON.stringify(['EVENT', signedEvent]))
-    }
-
-    wsRelay.onmessage = function (msg) {
-      const m = JSON.parse(msg.data)
-      if (m[0] === 'OK') {
-        isMessageSentSuccessfully = true
-        clearTimeout(timer)
-        wsRelay.close()
-        console.log('Successfully sent event to', relay)
-        resolve()
-      }
-    }
-
-    wsRelay.onerror = function (error) {
-      clearTimeout(timer)
-      console.log(error)
-      reject(new Error(`relay error: Failed to send to ${relay}`))
-    }
-
-    wsRelay.onclose = function () {
-      clearTimeout(timer)
-      if (!isMessageSentSuccessfully) {
-        reject(new Error(`relay error: Failed to send to ${relay}`))
-      }
-    }
-  })
+  const relay = await Relay.connect(relayUrl, { timeout })
+  await relay.publish(signedEvent, { timeout })
 }
 
 export async function crosspost (event, relays = DEFAULT_CROSSPOSTING_RELAYS) {
@@ -118,13 +222,3 @@ export async function crosspost (event, relays = DEFAULT_CROSSPOSTING_RELAYS) {
     return { error }
   }
 }
-
-export function callWithTimeout (targetFunction, timeoutMs) {
-  return new Promise((resolve, reject) => {
-    Promise.race([
-      targetFunction(),
-      new Promise((resolve, reject) => setTimeout(() => reject(new Error('timeouted after ' + timeoutMs + ' ms waiting for extension')), timeoutMs))
-    ]).then(resolve)
-      .catch(reject)
-  })
-}

lib/time.js

@@ -127,3 +127,20 @@ function tzOffset (tz) {
   const targetOffsetHours = (date.getTime() - targetDate.getTime()) / 1000 / 60 / 60
   return targetOffsetHours
 }
+
+function timeoutPromise (timeout) {
+  return new Promise((resolve, reject) => {
+    // if no timeout is specified, never settle
+    if (!timeout) return
+
+    setTimeout(() => reject(new Error('timeout')), timeout)
+  })
+}
+
+export async function withTimeout (promise, timeout) {
+  return await Promise.race([promise, timeoutPromise(timeout)])
+}
+
+export async function callWithTimeout (fn, timeout) {
+  return await Promise.race([fn(), timeoutPromise(timeout)])
+}

package-lock.json

@@ -41,6 +41,7 @@
         "graphql-scalar": "^0.1.0",
         "graphql-tag": "^2.12.6",
         "graphql-type-json": "^0.3.2",
+        "isomorphic-ws": "^5.0.0",
         "ln-service": "^57.1.3",
         "macaroon": "^3.0.4",
         "mathjs": "^11.11.2",
@@ -10548,6 +10549,14 @@
       "integrity": "sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==",
       "dev": true
     },
+    "node_modules/isomorphic-ws": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/isomorphic-ws/-/isomorphic-ws-5.0.0.tgz",
+      "integrity": "sha512-muId7Zzn9ywDsyXgTIafTry2sV3nySZeUDe6YedVd1Hvuuep5AsIlqK+XefWpYTyJG5e503F2xIuT2lcU6rCSw==",
+      "peerDependencies": {
+        "ws": "*"
+      }
+    },
     "node_modules/isstream": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",

package.json

@@ -46,6 +46,7 @@
     "graphql-scalar": "^0.1.0",
     "graphql-tag": "^2.12.6",
     "graphql-type-json": "^0.3.2",
+    "isomorphic-ws": "^5.0.0",
     "ln-service": "^57.1.3",
     "macaroon": "^3.0.4",
     "mathjs": "^11.11.2",

wallets/nwc/client.js

@@ -1,5 +1,6 @@
 import { parseNwcUrl } from '@/lib/url'
-import { Relay, finalizeEvent, nip04 } from 'nostr-tools'
+import { finalizeEvent, nip04 } from 'nostr-tools'
+import { Relay } from '@/lib/nostr'
 
 export * from 'wallets/nwc'
 
@@ -7,112 +8,67 @@ export async function testConnectClient ({ nwcUrl }, { logger }) {
   const { relayUrl, walletPubkey } = parseNwcUrl(nwcUrl)
 
   logger.info(`requesting info event from ${relayUrl}`)
-  const relay = await Relay
-    .connect(relayUrl)
-    .catch(() => {
-      // NOTE: passed error is undefined for some reason
-      const msg = `failed to connect to ${relayUrl}`
-      logger.error(msg)
-      throw new Error(msg)
-    })
+
+  const relay = await Relay.connect(relayUrl)
   logger.ok(`connected to ${relayUrl}`)
 
   try {
-    await new Promise((resolve, reject) => {
-      let found = false
-      const sub = relay.subscribe([
-        {
+    const [info] = await relay.fetch([{
       kinds: [13194],
       authors: [walletPubkey]
-        }
-      ], {
-        onevent (event) {
-          found = true
+    }])
+
+    if (info) {
       logger.ok(`received info event from ${relayUrl}`)
-          resolve(event)
-        },
-        onclose (reason) {
-          if (!['closed by caller', 'relay connection closed by us'].includes(reason)) {
-            // only log if not closed by us (caller)
-            const msg = 'connection closed: ' + (reason || 'unknown reason')
-            logger.error(msg)
-            reject(new Error(msg))
+    } else {
+      throw new Error('info event not found')
     }
-        },
-        oneose () {
-          if (!found) {
-            const msg = 'EOSE received without info event'
-            logger.error(msg)
-            reject(new Error(msg))
-          }
-          sub?.close()
-        }
-      })
-    })
   } finally {
-    // For some reason, this throws 'WebSocket is already in CLOSING or CLOSED state'
-    // even though relay connection is still open here
-    relay?.close()?.catch()
-    if (relay) logger.info(`closed connection to ${relayUrl}`)
+    relay?.close()
+    logger.info(`closed connection to ${relayUrl}`)
   }
 }
 
 export async function sendPayment (bolt11, { nwcUrl }, { logger }) {
   const { relayUrl, walletPubkey, secret } = parseNwcUrl(nwcUrl)
 
-  const relay = await Relay.connect(relayUrl).catch(() => {
-    // NOTE: passed error is undefined for some reason
-    throw new Error(`failed to connect to ${relayUrl}`)
-  })
+  const relay = await Relay.connect(relayUrl)
   logger.ok(`connected to ${relayUrl}`)
 
   try {
-    const ret = await new Promise(function (resolve, reject) {
-      (async function () {
     const payload = {
       method: 'pay_invoice',
       params: { invoice: bolt11 }
     }
-        const content = await nip04.encrypt(secret, walletPubkey, JSON.stringify(payload))
+    const encrypted = await nip04.encrypt(secret, walletPubkey, JSON.stringify(payload))
 
     const request = finalizeEvent({
       kind: 23194,
       created_at: Math.floor(Date.now() / 1000),
       tags: [['p', walletPubkey]],
-          content
+      content: encrypted
     }, secret)
     await relay.publish(request)
 
-        const filter = {
+    const [response] = await relay.fetch([{
       kinds: [23195],
       authors: [walletPubkey],
       '#e': [request.id]
+    }])
+
+    if (!response) {
+      throw new Error('no response')
     }
-        relay.subscribe([filter], {
-          async onevent (response) {
-            try {
-              const content = JSON.parse(await nip04.decrypt(secret, walletPubkey, response.content))
-              if (content.error) return reject(new Error(content.error.message))
-              if (content.result) return resolve({ preimage: content.result.preimage })
-            } catch (err) {
-              return reject(err)
-            }
-          },
-          onclose (reason) {
-            if (!['closed by caller', 'relay connection closed by us'].includes(reason)) {
-              // only log if not closed by us (caller)
-              const msg = 'connection closed: ' + (reason || 'unknown reason')
-              reject(new Error(msg))
-            }
-          }
-        })
-      })().catch(reject)
-    })
-    return ret
+
+    const decrypted = await nip04.decrypt(secret, walletPubkey, response.content)
+    const content = JSON.parse(decrypted)
+
+    if (content.error) throw new Error(content.error.message)
+    if (content.result) return { preimage: content.result.preimage }
+
+    throw new Error('invalid response')
   } finally {
-    // For some reason, this throws 'WebSocket is already in CLOSING or CLOSED state'
-    // even though relay connection is still open here
-    relay?.close()?.catch()
-    if (relay) logger.info(`closed connection to ${relayUrl}`)
+    relay?.close()
+    logger.info(`closed connection to ${relayUrl}`)
   }
 }

worker/nostr.js

@@ -1,5 +1,6 @@
 import { getInvoice } from 'ln-service'
-import { Relay, signId, calculateId, getPublicKey } from 'nostr'
+import { signId, calculateId, getPublicKey } from 'nostr'
+import { Relay } from '@/lib/nostr'
 
 const nostrOptions = { startAfter: 5, retryLimit: 21, retryBackoff: true }
 
@@ -50,31 +51,12 @@ export async function nip57 ({ data: { hash }, boss, lnd, models }) {
 
     console.log('zap note', e, relays)
     await Promise.allSettled(
-      relays.map(r => new Promise((resolve, reject) => {
+      relays.map(async r => {
         const timeout = 1000
-        const relay = Relay(r)
-
-        function timedout () {
-          relay.close()
-          console.log('failed to send to', r)
-          reject(new Error('relay timeout'))
-        }
-
-        let timer = setTimeout(timedout, timeout)
-
-        relay.on('open', () => {
-          clearTimeout(timer)
-          timer = setTimeout(timedout, timeout)
-          relay.send(['EVENT', e])
+        const relay = await Relay.connect(r, { timeout })
+        await relay.publish(e, { timeout })
       })
-
-        relay.on('ok', () => {
-          clearTimeout(timer)
-          relay.close()
-          console.log('sent zap to', r)
-          resolve()
-        })
-      })))
+    )
   } catch (e) {
     console.log(e)
   }