From d97a824362dbae09280e0ff5cf86b0553764d554 Mon Sep 17 00:00:00 2001
From: Daniel Gonzalez <danielhumgon@gmail.com>
Date: Tue, 21 Sep 2021 11:08:15 -0400
Subject: [PATCH] feat(wallet): Poll for wallet services

---
 package.json                                  |  1 +
 .../admin-lte/configure/ipfs-tab/index.js     |  3 +-
 .../admin-lte/configure/lib/ipfs-control.js   | 65 +++++++++++++++++++
 3 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 45141a1..caff56b 100644
--- a/package.json
+++ b/package.json
@@ -47,6 +47,7 @@
     "react-jdenticon": "0.0.9",
     "react-qr-reader": "^2.2.1",
     "react-redux": "^7.2.4",
+    "semver": "^7.3.5",
     "stream-browserify": "^3.0.0",
     "stream-http": "^3.2.0"
   },
diff --git a/src/components/admin-lte/configure/ipfs-tab/index.js b/src/components/admin-lte/configure/ipfs-tab/index.js
index 48d4675..39e41e9 100644
--- a/src/components/admin-lte/configure/ipfs-tab/index.js
+++ b/src/components/admin-lte/configure/ipfs-tab/index.js
@@ -155,7 +155,8 @@ class IPFS extends React.Component {
         // handleChatLog: _this.onCommandLog
         handleChatLog: _this.incommingChat,
         bchWallet: bchWallet || _this.props.bchWallet, // bch wallet instance
-        privateLog: _this.privLogChat
+        privateLog: _this.privLogChat,
+        pollLog: _this.onAppStatus
       }
       // Retrieve last ipfs control
       const { menuNavigation } = _this.props
diff --git a/src/components/admin-lte/configure/lib/ipfs-control.js b/src/components/admin-lte/configure/lib/ipfs-control.js
index 814b084..c031907 100644
--- a/src/components/admin-lte/configure/lib/ipfs-control.js
+++ b/src/components/admin-lte/configure/lib/ipfs-control.js
@@ -7,9 +7,12 @@
 */
 import IPFS from '@chris.troutner/ipfs'
 import IpfsCoord from 'ipfs-coord'
+const semver = require('semver')
 
 // CHANGE THESE VARIABLES
 const CHAT_ROOM_NAME = 'psf-ipfs-chat-001'
+const MIN_BCH_WALLET_VERSION = '1.11.0'
+const WALLET_PROTOCOL = 'bch-wallet'
 
 // JSON-LD schema used in announcement.
 // Customize this data for your own app.
@@ -35,7 +38,11 @@ class IpfsControl {
     this.handleChatLog = ipfsConfig.handleChatLog
     this.wallet = ipfsConfig.bchWallet
     this.privateLog = ipfsConfig.privateLog
+    this.pollLog = ipfsConfig.pollLog
+    this.serviceProviders = []
+    this.selectedServiceProvider = null
 
+    this.semver = semver
     _this = this
   }
 
@@ -141,6 +148,8 @@ class IpfsControl {
       console.log('IPFS node setup complete.')
       this.statusLog('IPFS node setup complete.')
       _this.statusLog(' ')
+
+      setInterval(this.pollForServices, 10000)
     } catch (err) {
       console.error('Error in startIpfs(): ', err)
       this.statusLog(
@@ -164,6 +173,62 @@ class IpfsControl {
       announceJsonLd
     }
   }
+
+  // Poll the ipfs-coord coordination channel for available service providers.
+  pollForServices () {
+    try {
+      // An array of IPFS IDs of other nodes in the coordination pubsub channel.
+      const peers = _this.ipfsCoord.thisNode.peerList
+      // console.log(`peers: ${JSON.stringify(peers, null, 2)}`)
+
+      // Array of objects. Each object is the IPFS ID of the peer and contains
+      // data about that peer.
+      const peerData = _this.ipfsCoord.thisNode.peerData
+      // console.log(`peerData: ${JSON.stringify(peerData, null, 2)}`)
+
+      for (let i = 0; i < peers.length; i++) {
+        const thisPeer = peers[i]
+        const thisData = peerData.filter(x => x.from === thisPeer)
+        const thisPeerData = thisData[0]
+
+        // Create a 'fingerprint' that defines the wallet service.
+        const protocol = thisPeerData.data.jsonLd.protocol
+        const version = thisPeerData.data.jsonLd.version
+        // console.log(
+        //   `debug: peer ${thisPeer} uses protocol: ${protocol} v${version}`,
+        // )
+
+        let versionMatches = false
+        if (version) {
+          versionMatches = _this.semver.gt(version, MIN_BCH_WALLET_VERSION)
+        }
+
+        // Ignore any peers that don't match the fingerprint for a BCH wallet
+        // service.
+        if (protocol && protocol.includes(WALLET_PROTOCOL) && versionMatches) {
+          // console.log('Matching peer: ', thisPeerData)
+
+          // Temporary business logic.
+          // Use the first available wallet service detected.
+          if (_this.serviceProviders.length === 0) {
+            _this.selectedServiceProvider = thisPeer
+
+            // Persist the config setting, so it can be used by other commands.
+            // _this.conf.set('selectedService', thisPeer)
+            const pollLog = `---->BCH wallet service selected: ${thisPeer}`
+            console.log(pollLog)
+            _this.pollLog(pollLog)
+          }
+
+          // Add the peer to the list of serviceProviders.
+          _this.serviceProviders.push(thisPeer)
+        }
+      }
+    } catch (err) {
+      console.error('Error in pollForServices(): ', err)
+      // Do not throw error. This is a top-level function.
+    }
+  }
 }
 
 // module.exports = AppIpfs