feat(examples): 添加 LLM 单轮对话示例

examples/simple_visit.rs

@@ -0,0 +1,62 @@
+use std::env;
+
+use agcore::init_tracing;
+use agcore::llm::{
+    cycle::{CycleConfig, LlmCycle},
+    provider::openai::OpenaiProvider,
+    types::{ChatResponse, OpenaiContentPart},
+};
+
+fn extract_response_text(response: &ChatResponse) -> &str {
+    match &response.message {
+        agcore::llm::types::OpenaiChatMessage::Assistant { content, .. } => match content {
+            agcore::llm::types::ContentField::String(s) => s,
+            agcore::llm::types::ContentField::Array(parts) => {
+                for part in parts {
+                    if let OpenaiContentPart::Text { text } = part {
+                        return text;
+                    }
+                }
+                "[无文本内容]"
+            }
+        },
+        _ => "[非 assistant 消息]",
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    dotenvy::dotenv().ok();
+    init_tracing();
+
+    let api_key = env::var("OPENAI_API_KEY").expect("未设置 OPENAI_API_KEY 环境变量");
+    let base_url = env::var("OPENAI_BASE_URL").expect("未设置 OPENAI_BASE_URL 环境变量");
+    let model = env::var("OPENAI_MODEL").expect("未设置 OPENAI_MODEL 环境变量选择所要使用的模型");
+
+    let provider = OpenaiProvider::new(base_url, api_key, model.clone());
+    let config = CycleConfig {
+        model,
+        max_tokens: Some(65536),
+        temperature: Some(1.3),
+        ..CycleConfig::default()
+    };
+
+    let mut cycle = LlmCycle::new(Box::new(provider), config)
+        .with_system_prompt("你是一个简洁的助手，对于任何问题都是用一句话回答。".to_string());
+
+    println!("发送请求...");
+
+    match cycle.submit("介绍一下你自己吧。".to_string(), vec![]).await {
+        Ok(response) => {
+            println!("LLM 回复：{}", extract_response_text(&response));
+            println!(
+                "Token 用量：{} 输入， {} 输出",
+                response.usage.prompt_tokens, response.usage.completion_tokens
+            );
+        }
+        Err(e) => {
+            eprintln!("请求失败：{e}");
+            std::process::exit(1);
+        }
+    }
+}