feat(WC): Handle unavailable chains or internet connection

This commits implements the `connect` `disconnect` session events for WC and also disables primary buttons for WC whenever there is no connection to internet or chains.

+ update tests

storybook/pages/DAppsWorkflowPage.qml

@@ -72,6 +72,7 @@ Item {
                     accountsModel: wcService.validAccounts
                     networksModel: wcService.flatNetworks
                     sessionRequestsModel: wcService.sessionRequestsModel
+                    enabled: wcService.isServiceOnline
 
                     //formatBigNumber: (number, symbol, noSymbolOption) => wcService.walletRootStore.currencyStore.formatBigNumber(number, symbol, noSymbolOption)
 
@@ -200,6 +201,13 @@ Item {
                 }
             }
 
+            StatusBaseText { text: "Networks Down" }
+
+            NetworkFilter {
+                id: networkFilter
+                flatNetworks: walletConnectService.walletRootStore.filteredFlatModel
+            }
+
             // spacer
             ColumnLayout {}
 
@@ -337,6 +345,8 @@ Item {
             projectId: projectIdText.projectId
         }
 
+        blockchainNetworksDown: networkFilter.selection
+
         store: SharedStores.DAppsStore {
             signal dappsListReceived(string dappsJson)
             signal userAuthenticated(string topic, string id, string password, string pin)

storybook/qmlTests/tests/tst_DAppsWorkflow.qml

@@ -121,6 +121,7 @@ Item {
             onPairingValidated: function(validationState) {
                 onPairingValidatedTriggers.push({validationState})
             }
+            blockchainNetworksDown: []
         }
     }
 
@@ -221,6 +222,33 @@ Item {
                 }
             }
 
+            readonly property ListModel filteredFlatModelWithOnlineStat: ListModel {
+                ListElement {
+                    chainId: 1
+                    layer: 1
+                    isOnline: true
+                }
+                ListElement {
+                    chainId: 2
+                    chainName: "Test Chain"
+                    iconUrl: "network/Network=Ethereum"
+                    layer: 2
+                    isOnline: true
+                }
+                // Used by tst_balanceCheck
+                ListElement {
+                    chainId: 11155111
+                    layer: 1
+                    isOnline: true
+                }
+                // Used by tst_balanceCheck
+                ListElement {
+                    chainId: 421613
+                    layer: 2
+                    isOnline: true
+                }
+            }
+
             readonly property ListModel nonWatchAccounts: ListModel {
                 ListElement {
                     address: "0x1"
@@ -299,9 +327,10 @@ Item {
                 sdk: sdk,
                 store: store,
                 accountsModel: walletStore.nonWatchAccounts,
-                networksModel: walletStore.filteredFlatModel
+                networksModel: walletStore.filteredFlatModelWithOnlineStat
             })
             verify(!!handler)
+            sdk.getActiveSessionsCallbacks = []
         }
 
         function cleanup() {
@@ -791,6 +820,7 @@ Item {
             verify(!!walletStore)
             provider = createTemporaryObject(dappsListProviderComponent, root, {sdk: sdk, store: store, supportedAccountsModel: walletStore.nonWatchAccounts})
             verify(!!provider)
+            sdk.getActiveSessionsCallbacks = []
         }
 
         function cleanup() {

ui/app/AppLayouts/Wallet/helpers/ChainsAvailabilityWatchdog.qml

@@ -0,0 +1,56 @@
+import QtQuick 2.15
+
+import StatusQ 0.1
+import StatusQ.Core.Utils 0.1
+
+// This component receives the networksModel
+// and breaks down the online status of each chain
+QObject {
+    id: root
+    // Required roleNames: chainId, isOnline
+    required property var networksModel
+
+    readonly property bool allOffline: d.allOffline
+    readonly property bool allOnline: d.allOnline
+
+    property bool active: true
+
+    signal chainOnlineChanged(int chainId, bool isOnline)
+
+    // Network online observer
+    // `chainOnlineChanged` signal when the online status of a chain changes
+    Instantiator {
+        id: networkOnlineObserver
+        model: root.networksModel
+        active: root.active
+        delegate: QtObject {
+            required property var model
+            property var /*var intended*/ isOnline: model.isOnline
+
+            onIsOnlineChanged: {
+                root.chainOnlineChanged(model.chainId, isOnline)
+            }
+        }
+    }
+
+    // Aggregator to count the number of online chains
+    SumAggregator{
+        id: aggregator
+        model: root.active ? root.networksModel : null
+        roleName: "isOnline"
+    }
+
+    // Network checker to check if the device is online
+    NetworkChecker {
+        id: networkChecker
+        active: root.active
+    }
+
+    QtObject {
+        id: d
+        readonly property bool allOffline: !networkChecker.isOnline || aggregator.value === 0
+        readonly property bool allOnline: networkChecker.isOnline &&
+                                        aggregator.value > 0 &&
+                                        aggregator.value === networksModel.ModelCount.count
+    }
+}

ui/app/AppLayouts/Wallet/helpers/qmldir

@@ -2,3 +2,4 @@ ChartDataBase 1.0 ChartDataBase.qml
 TokenBalanceHistoryData 1.0 TokenBalanceHistoryData.qml
 TokenMarketValuesData 1.0 TokenMarketValuesData.qml
 singleton NetworkModelHelpers 1.0 NetworkModelHelpers.qml
+ChainsAvailabilityWatchdog 1.0 ChainsAvailabilityWatchdog.qml

ui/app/AppLayouts/Wallet/panels/WalletHeader.qml

@@ -146,7 +146,7 @@ Item {
                 visible: !root.walletStore.showSavedAddresses
                          && root.dappsEnabled
                          && wcService.serviceAvailableToCurrentAddress
-                enabled: !!Global.walletConnectService
+                enabled: !!wcService && wcService.isServiceOnline
 
 
                 loginType: root.loginType

ui/app/AppLayouts/Wallet/services/dapps/DAppsRequestHandler.qml

@@ -16,11 +16,13 @@ SQUtils.QObject {
     required property WalletConnectSDKBase sdk
     required property DAppsStore store
     required property var accountsModel
+    // Required roles: chainId, layer, isOnline
     required property var networksModel
     required property CurrenciesStore currenciesStore
     required property WalletStore.WalletAssetsStore assetsStore
 
     property alias requestsModel: requests
+    readonly property bool isServiceOnline: chainsSupervisorPlugin.anyChainAvailable && sdk.sdkReady
 
     function subscribeForFeeUpdates(topic, id) {
         d.subscribeForFeeUpdates(topic, id)
@@ -1175,4 +1177,11 @@ SQUtils.QObject {
             }
         }
     }
+
+    ChainsSupervisorPlugin {
+        id: chainsSupervisorPlugin
+
+        sdk: root.sdk
+        networksModel: root.networksModel
+    }
 }

ui/app/AppLayouts/Wallet/services/dapps/WalletConnectSDK.qml

@@ -364,14 +364,6 @@ WalletConnectSDKBase {
                                    `
             )
         }
-
-        function connected() {
-            console.debug(`WC WalletConnectSDK.wcCall.connected;`)
-        }
-
-        function disconnected() {
-            console.debug(`WC WalletConnectSDK.wcCall.disconnected;`)
-        }
     }
 
     QtObject {

ui/app/AppLayouts/Wallet/services/dapps/WalletConnectService.qml

@@ -32,6 +32,8 @@ QObject {
     required property WalletConnectSDKBase wcSDK
     required property DAppsStore store
     required property var walletRootStore
+    // // Array[chainId] of the networks that are down
+    required property var blockchainNetworksDown
 
     //output properties
     /// Model contaning all dApps available for the currently selected account
@@ -49,6 +51,8 @@ QObject {
     /// TODO: refactor
     readonly property alias connectorDAppsProvider: connectorDAppsProvider
 
+    readonly property bool isServiceOnline: requestHandler.isServiceOnline
+
     // methods
     /// Triggers the signing process for the given session request
     /// @param topic The topic of the session
@@ -250,7 +254,16 @@ QObject {
         sdk: root.wcSDK
         store: root.store
         accountsModel: root.validAccounts
-        networksModel: root.flatNetworks
+        networksModel: SortFilterProxyModel {
+            sourceModel: root.flatNetworks
+            proxyRoles: [
+                FastExpressionRole {
+                    name: "isOnline"
+                    expression: !root.blockchainNetworksDown.map(Number).includes(model.chainId)
+                    expectedRoles: "chainId"
+                }
+            ]
+        }
         currenciesStore: root.walletRootStore.currencyStore
         assetsStore: root.walletRootStore.walletAssetsStore
 

ui/app/AppLayouts/Wallet/services/dapps/plugins/ChainsSupervisorPlugin.qml

@@ -0,0 +1,150 @@
+import QtQuick 2.15
+
+import AppLayouts.Wallet.helpers 1.0
+import AppLayouts.Wallet.services.dapps 1.0
+import AppLayouts.Wallet.services.dapps.types 1.0 as DAppsTypes
+
+import StatusQ 0.1
+import StatusQ.Core.Utils 0.1
+
+// This plugin handles the chain ability for the dapps
+// It monitors the chain availability and updates the dapps accordingly
+// When all chains are offline, it will inform each session that the chains are offline
+// When a chain comes back online, it will check if there are any active sessions and inform them
+// See [EIP-1193](https://eips.ethereum.org/EIPS/eip-1193)
+QObject {
+    id: root
+
+    required property WalletConnectSDKBase sdk
+    // Required roles: chainId, isOnline
+    required property var networksModel
+    // Happens when any chain is available
+    readonly property bool anyChainAvailable: !chainsAvailabilityWatchdog.allOffline
+
+    ChainsAvailabilityWatchdog {
+        id: chainsAvailabilityWatchdog
+
+        // property used for spam protection
+        property var lastNotifiedCStatuses: new Map()
+        networksModel: root.networksModel
+
+        onChainOnlineChanged: (chainId, isOnline) => {
+            if (!isOnline || !sdk.sdkReady) {
+                return
+            }
+
+            // Spam protection. Spamming the SDK could result to blocks
+            if (lastNotifiedCStatuses.has(chainId) && lastNotifiedCStatuses.get(chainId) === isOnline) {
+                return
+            }
+
+            lastNotifiedCStatuses.set(chainId, isOnline)
+            d.notifyChainConnected(chainId)
+        }
+
+        onAllOfflineChanged: {
+            if(!sdk.sdkReady) {
+                return
+            }
+
+            if (allOffline) {
+                lastNotifiedCStatuses.clear()
+                d.notifyAllChainsDisconnected()
+            }
+        }
+    }
+
+    QtObject {
+        id: d
+
+        function sessionHasEventSupport(session, event) {
+            try {
+                if (!event) {
+                    return false
+                }
+
+                if (session.namespaces.eip155.events.includes(event)) {
+                    return true
+                }
+
+                return false
+            } catch (e) {
+                console.error("Error checking sessionHasEventSupport: ", e)
+                return false
+            }
+        }
+
+        function sessionHasChainSupport(session, chainId) {
+            try {
+                if (!chainId) {
+                    return false
+                }
+
+                let chainIds = session.namespaces.eip155.chains.map(DAppsHelpers.chainIdFromEip155);
+                if (!chainIds.includes(chainId)) {
+                    return false
+                }
+
+                let accounts = session.namespaces.eip155.accounts
+                let chainAccounts = accounts.map((account) => account.startsWith(`eip155:${chainId}`))
+                if (!chainAccounts.includes(true)) {
+                    return false
+                }
+
+                return true
+            } catch (e) {
+                console.error("Error checking sessionHasChainSupport: ", e)
+                return false
+            }
+        }
+
+        function notifyAllChainsDisconnected() {
+            sdk.getActiveSessions((allSessions) => {
+                Object.values(allSessions).forEach((session) => {
+                    if (!d.sessionHasEventSupport(session, "disconnect")) {
+                        return
+                    }
+
+                    try {
+                        session.namespaces.eip155.chains.forEach((chainId) => {
+                            const chainInt = DAppsHelpers.chainIdFromEip155(chainId)
+                            if (!d.sessionHasChainSupport(session, chainInt)) {
+                                return
+                            }
+
+                            sdk.emitSessionEvent(session.topic, {
+                                name: "disconnect",
+                                data: {
+                                    code: DAppsTypes.ErrorCodes.rpcErrors.disconnected,
+                                }
+                            }, chainId)
+                        })
+                    } catch (e) {
+                        console.error("Error emitting session event: ", e)
+                    }
+                })
+            })
+        }
+
+        function notifyChainConnected(chainId) {
+            sdk.getActiveSessions((sessions) => {
+                Object.values(sessions).forEach((session) => {
+                    if (!d.sessionHasEventSupport(session, "connect")) {
+                        return
+                    }
+                    if (!d.sessionHasChainSupport(session, chainId)) {
+                        return
+                    }
+
+                    const hexChain = `0x${chainId.toString(16)}`
+                    sdk.emitSessionEvent(session.topic, {
+                        name: "connect",
+                        data: {
+                            chainId: hexChain,
+                        }
+                    }, `eip155:${chainId}`)
+                })
+            })
+        }
+    }
+}

ui/app/AppLayouts/Wallet/services/dapps/plugins/qmldir

@@ -1,2 +1,3 @@
+ChainsSupervisorPlugin 1.0 ChainsSupervisorPlugin.qml
 SiweRequestPlugin 1.0 SiweRequestPlugin.qml
 SiweLifeCycle 1.0 SiweLifeCycle.qml

ui/app/AppLayouts/Wallet/services/dapps/types/ErrorCodes.qml

@@ -0,0 +1,13 @@
+pragma Singleton
+import QtQuick 2.15
+
+QtObject {
+    // Maps to https://eips.ethereum.org/EIPS/eip-1193#rpc-errors
+    readonly property QtObject rpcErrors: QtObject {
+        readonly property int userRejectedRequest: 4001
+        readonly property int unauthorized: 4100
+        readonly property int unsupportedMethod: 4200
+        readonly property int disconnected: 4900
+        readonly property int chainDisconnected: 4901
+    }
+}

ui/app/AppLayouts/Wallet/services/dapps/types/qmldir

@@ -3,3 +3,4 @@ SessionRequestWithAuth 1.0 SessionRequestWithAuth.qml
 SessionRequestsModel 1.0 SessionRequestsModel.qml
 singleton SessionRequest 1.0 SessionRequest.qml
 singleton Pairing 1.0 Pairing.qml
+singleton ErrorCodes 1.0 ErrorCodes.qml

ui/app/mainui/AppMain.qml

@@ -2208,6 +2208,7 @@ Item {
                 controller: WalletStores.RootStore.walletConnectController
             }
             walletRootStore: WalletStores.RootStore
+            blockchainNetworksDown: appMain.networkConnectionStore.blockchainNetworksDown
 
             Component.onCompleted: {
                 Global.walletConnectService = walletConnectService