fix: fix server timeout issue

Author: phodal

llm-modules/openai/src/main/kotlin/cc/unitmesh/openai/OpenAiProvider.kt

@@ -56,7 +56,7 @@ class OpenAiProvider(var apiKey: String, var apiHost: String? = null) : LlmProvi
         var result = ""
         openai.streamChatCompletion(request)
             .blockingForEach { response ->
-                val completion = response.choices[0].message
+                val completion = response.choices?.get(0)?.message
                 if (completion != null && completion.content != null) {
                     result += completion.content
                 }

server/src/main/kotlin/cc/unitmesh/cf/presentation/ChatController.kt

@@ -21,11 +21,12 @@ import org.springframework.http.ResponseEntity
 import org.springframework.stereotype.Controller
 import org.springframework.web.bind.annotation.PostMapping
 import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RestController
 import org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody
 import java.io.IOException
 
 
-@Controller
+@RestController
 class ChatController(
     val feFlow: FEWorkflow,
     val codeFlow: CodeInterpreterWorkflow,

server/src/main/kotlin/cc/unitmesh/cf/presentation/config/CorsConfiguration.kt renamed to server/src/main/kotlin/cc/unitmesh/cf/presentation/config/WebConfig.kt

@@ -1,17 +1,24 @@
 package cc.unitmesh.cf.presentation.config
 
 import org.springframework.context.annotation.Configuration
+import org.springframework.scheduling.annotation.EnableAsync
+import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer
 import org.springframework.web.servlet.config.annotation.CorsRegistry
 import org.springframework.web.servlet.config.annotation.EnableWebMvc
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer
 
 @Configuration
 @EnableWebMvc
+@EnableAsync
 class WebConfig : WebMvcConfigurer {
     override fun addCorsMappings(registry: CorsRegistry) {
         registry.addMapping("/**")
             .allowedMethods("*")
             .allowedOrigins("*")
             .allowedHeaders("*")
     }
+
+    override fun configureAsyncSupport(configurer: AsyncSupportConfigurer) {
+        configurer.setDefaultTimeout(-1)
+    }
 }