Implements billing service disconnection logic

app/src/main/java/net/pokeranalytics/android/util/billing/AppGuard.kt

@@ -35,28 +35,40 @@ object AppGuard : PurchasesUpdatedListener {
 
 		billingClient = BillingClient.newBuilder(context).setListener(this).build()
 
-		this.restorePurchases()
+		this.startConnection(Runnable {
+			this.restorePurchases()
+		})
+
+	}
+
+	private fun startConnection(executeOnSuccess: Runnable) {
 
 		billingClient.startConnection(object : BillingClientStateListener {
 			override fun onBillingSetupFinished(@BillingClient.BillingResponse billingResponseCode: Int) {
 				if (billingResponseCode == BillingClient.BillingResponse.OK) {
 					// The BillingClient is ready. You can query purchases here.
-
 					billingClientAvailable = true
-
+					executeOnSuccess.run()
 				}
 			}
 
 			override fun onBillingServiceDisconnected() {
 				billingClientAvailable = false
-
-				// Try to restart the connection on the next request to
-				// Google Play by calling the startConnection() method.
 			}
 		})
 
 	}
 
+	private fun executeServiceRequest(runnable: Runnable) {
+
+		if (billingClientAvailable) {
+			runnable.run()
+		} else {
+			this.startConnection(runnable)
+		}
+
+	}
+
 	/**
 	 * Restore purchases
 	 */
@@ -81,7 +93,10 @@ object AppGuard : PurchasesUpdatedListener {
 			val params = SkuDetailsParams.newBuilder()
 			params.setSkusList(skuList).setType(BillingClient.SkuType.SUBS)
 
-			billingClient.querySkuDetailsAsync(params.build(), listener)
+			this.executeServiceRequest(Runnable {
+				billingClient.querySkuDetailsAsync(params.build(), listener)
+			})
+
 			return true
 		}
 		return false
@@ -95,7 +110,10 @@ object AppGuard : PurchasesUpdatedListener {
 		val flowParams = BillingFlowParams.newBuilder()
 			.setSkuDetails(skuDetails)
 			.build()
-		val responseCode = billingClient.launchBillingFlow(activity, flowParams)
+
+		this.executeServiceRequest(Runnable {
+			val responseCode = billingClient.launchBillingFlow(activity, flowParams)
+		})
 
 	}