refactor(SSE handling): improve SSE parsing logic #97

Refactored the Server Sent Event (SSE) parsing logic to handle edge cases better and make code cleaner. The new approach fixes #16 which involved adding checks on whether incoming events were `"ping":` or just starting with `":"` followed by "ping". It also added functionality to clear chat window before showing new messages while creating a new conversation using NewChatAction component. Made this change because it enhances user experience by providing smoother interaction between server push notifications and client display of those notifications. Modified these files accordingly as per suggestions from SonarLint analysis.

src/main/kotlin/cc/unitmesh/devti/gui/toolbar/NewChatAction.kt

@@ -38,7 +38,16 @@ class NewChatAction : DumbAwareAction(), CustomComponentAction {
                         AutoDevToolWindowFactory.Util.id
                     )
 
-                    AutoDevToolWindowFactory().createToolWindowContent(project, toolWindowManager!!)
+                    val contentManager = toolWindowManager?.contentManager
+                    val codingPanel =
+                        contentManager?.component?.components?.filterIsInstance<ChatCodingPanel>()?.firstOrNull()
+
+                    if (codingPanel == null) {
+                        AutoDevToolWindowFactory().createToolWindowContent(project, toolWindowManager!!)
+                        return@addActionListener
+                    }
+
+                    codingPanel.clearChat()
                 }
             }
         }

src/main/kotlin/cc/unitmesh/devti/llms/azure/ResponseBodyCallback.kt

@@ -64,8 +64,12 @@ class ResponseBodyCallback(private val emitter: FlowableEmitter<SSE>, private va
                 sse = when {
                     line!!.startsWith("data:") -> {
                         val data = line!!.substring(5).trim { it <= ' ' }
-                        //  data: ping - 2024-03-05 02:07:20.310586
-                        if (data.startsWith("ping") || data.startsWith(" ping")) {
+                        //  https://github.com/sysid/sse-starlette/issues/16
+                        //  ```
+                        //  event: ping
+                        //  data: 2020-12-22 15:33:27.463789
+                        //  ```
+                        if (data.startsWith(":ping") || data.startsWith(": ping")) {
                             null
                         } else {
                             SSE(data)
@@ -84,7 +88,14 @@ class ResponseBodyCallback(private val emitter: FlowableEmitter<SSE>, private va
                     }
                     // starts with event:
                     line!!.startsWith("event:") -> {
-                        // do nothing
+                        // https://github.com/sysid/sse-starlette/issues/16
+                        val eventName = line!!.substring(6).trim { it <= ' ' }
+                        if (eventName == "ping") {
+                            // skip ping event and data
+                            emitter.onNext(sse)
+                            emitter.onNext(sse)
+                        }
+
                         null
                     }