From afc1ee44189265b4bec2b29e5847e189a1f80d9c Mon Sep 17 00:00:00 2001
From: Kutsal Kaan Bilgin <kutsalbilgin@gmail.com>
Date: Fri, 24 Jun 2022 09:36:49 +0300
Subject: [PATCH] Publish status for RPC subscription services.

---
 .../WSPRC/RPCSubscriptionService.swift        | 48 +++++++++----------
 1 file changed, 24 insertions(+), 24 deletions(-)

diff --git a/Sources/SubVTData/Service/WSPRC/RPCSubscriptionService.swift b/Sources/SubVTData/Service/WSPRC/RPCSubscriptionService.swift
index 0daa6f8..ad220a3 100644
--- a/Sources/SubVTData/Service/WSPRC/RPCSubscriptionService.swift
+++ b/Sources/SubVTData/Service/WSPRC/RPCSubscriptionService.swift
@@ -16,26 +16,26 @@ public enum RPCError: Error {
     case error(error: Error?)
 }
 
+public enum RPCSubscriptionServiceStatus {
+    case connected
+    case disconnected(code: UInt16, reason: String)
+    case error(error: Error?)
+    case idle
+    case subscribed(subscriptionId: UInt64)
+    case unsubscribed
+}
+
 /**
  Base class for RPC pub/sub services.
  */
-public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
-    private enum State {
-        case connected
-        case disconnected(code: UInt16, reason: String)
-        case error(error: Error?)
-        case idle
-        case subscribed(subscriptionId: UInt64)
-        case unsubscribed
-    }
-    
+public class RPCSubscriptionService<T: Codable>: ObservableObject, WebSocketDelegate {
     private let host: String
     private let port: UInt16
     private let subscribeMethod: String
     private let unsubscribeMethod: String
     private let socket: WebSocket
     
-    private var state = State.idle
+    @Published public private(set) var status = RPCSubscriptionServiceStatus.idle
     private var rpcId: UInt64 = 0
     private var subscriptionParameter: String? = nil
     
@@ -70,13 +70,13 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
         case .binary(_):
             break
         case .cancelled:
-            state = .idle
+            status = .idle
             eventBus.send(completion: .finished)
         case .connected(_):
-            state = .connected
+            status = .connected
             sendSubscriptionRequest()
         case .disconnected(let reason, let code):
-            switch state {
+            switch status {
             case .error(let error):
                 eventBus.send(
                     completion: .failure(
@@ -99,12 +99,12 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
             default:
                 break
             }
-            state = .disconnected(
+            status = .disconnected(
                 code: code,
                 reason: reason
             )
         case .error(let error):
-            state = .error(error: error)
+            status = .error(error: error)
             eventBus.send(
                 completion: .failure(
                     RPCError.error(
@@ -132,7 +132,7 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
     
     public func subscribe(parameter: String? = nil) -> AnyPublisher<RPCEvent<T>, RPCError> {
         subscriptionParameter = parameter
-        switch state {
+        switch status {
         case .disconnected(_, _):
             fallthrough
         case .idle:
@@ -144,7 +144,7 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
     }
     
     public func unsubscribe() {
-        guard case .subscribed(let subscriptionId) = state else {
+        guard case .subscribed(let subscriptionId) = status else {
             return
         }
         let request = RPCRequest<UInt64>(
@@ -183,13 +183,13 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
     private func processText(text: String) {
         if let data = text.data(using: .utf8) {
             do {
-                switch state {
+                switch status {
                 case .connected:
                     let response = try jsonDecoder.decode(
                         RPCSubscribeResponse.self,
                         from: data
                     )
-                    state = .subscribed(
+                    status = .subscribed(
                         subscriptionId: response.subscriptionId
                     )
                     eventBus.send(
@@ -215,7 +215,7 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
                             from: data
                         )
                         eventBus.send(RPCEvent.unsubscribed)
-                        state = .unsubscribed
+                        status = .unsubscribed
                         socket.disconnect()
                     }
                 default:
@@ -235,7 +235,7 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
                             )
                         )
                     )
-                    state = .error(error: nil)
+                    status = .error(error: nil)
                 } catch {
                     eventBus.send(
                         completion: .failure(
@@ -244,7 +244,7 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
                             )
                         )
                     )
-                    state = .error(error: error)
+                    status = .error(error: error)
                 }
                 socket.disconnect()
             }
@@ -254,7 +254,7 @@ public class RPCSubscriptionService<T: Codable>: WebSocketDelegate {
                     RPCError.dataReadError
                 )
             )
-            state = .error(error: nil)
+            status = .error(error: nil)
             socket.disconnect()
         }
     }