crabmate 0.4.0

//! 单轮 `run_agent_turn` 编排（从 `lib.rs` 拆出以降低单文件行数）。

use std::sync::Arc;

use tracing::Instrument;

use crate::llm as llm_mod;
use crate::{
    AgentTurnLlmOverrides, AgentTurnTransport, RunAgentTurnAttach, RunAgentTurnObs,
    RunAgentTurnParams, RunAgentTurnSession, RunAgentTurnSharedInputs,
};

fn resolved_turn_llm_backend<'a>(
    llm_backend: Option<&'a (dyn llm_mod::ChatCompletionsBackend + 'static)>,
) -> &'a (dyn llm_mod::ChatCompletionsBackend + 'static) {
    match llm_backend {
        Some(b) => b,
        None => llm_mod::default_chat_completions_backend(),
    }
}

async fn emit_mcp_servers_skipped_notice(
    skipped: &[crate::mcp::McpServerSkipInfo],
    out: Option<&tokio::sync::mpsc::Sender<String>>,
) {
    if skipped.is_empty() {
        return;
    }
    let detail = skipped
        .iter()
        .map(|s| format!("{} ({}): {}", s.name, s.id, s.error))
        .collect::<Vec<_>>()
        .join("\n");
    let title = if skipped.len() == 1 {
        format!("MCP 服务器连接失败：{}", skipped[0].name)
    } else {
        format!("MCP：{} 个服务器连接失败", skipped.len())
    };
    log::warn!(target: "crabmate", "MCP 本轮跳过服务器：\n{detail}");
    crate::turn_replay_dump::append_turn_replay_event_if_configured(
        "mcp_servers_skipped",
        title.as_str(),
        Some(detail.as_str()),
    );
    if let Some(tx) = out {
        let payload = crate::sse::SsePayload::TimelineLog {
            log: crate::sse::protocol::TimelineLogBody {
                kind: "mcp_servers_skipped".to_string(),
                title,
                detail: Some(detail),
            },
        };
        let _ = crate::sse::send_string_logged(
            tx,
            crate::sse::encode_message(payload),
            "mcp_servers_skipped",
        )
        .await;
    }
}

/// 执行一轮 Agent：发请求、若遇 tool_calls 则执行工具并继续，直到模型返回最终回复。
/// `cfg` 建议使用 [`Arc`] 共享（与进程内 Web 服务状态一致），以便工具在 `spawn_blocking` 路径中复用同一份配置而不反复深拷贝。
/// 若提供 transport.out，则流式 content 会通过 out 发送（供 SSE 等使用）；`transport.no_stream` 为 true 时 API 使用 `stream: false`，
/// 有正文则通过 `out` 一次性下发整段。
/// effective_working_dir 为当前生效的工作目录（可与前端设置的工作区一致）。
/// `transport.cancel` 为 `Some` 时，各轮请求会在流式读与重试间隔中轮询其标志；置位后尽快结束并返回 `Ok`（或 `Err`：[`agent::agent_turn::RunAgentTurnError`] 中含取消 / 限流 / SSE 早停等，用户可见串与常量 [`crate::types::LLM_CANCELLED_ERROR`] 对齐），供协作取消等场景使用。
/// 分阶段规划下若规划轮未解析出合法 `agent_reply_plan` v1：**不再**整轮失败退出：保留规划轮助手正文并**降级**为与门控拒绝时相同的常规 `run_agent_outer_loop`（含工具）。规划轮会先丢弃 API 返回的原生 `tool_calls`，再视情况执行工具，避免网关误报 `tool_calls` 时静默无动作。
/// `transport.per_flight` 仅 Web 队列任务传入，用于 `GET /status` 的 `per_active_jobs` 镜像；运维 CLI 传 `None`。
/// 自定义 `ChatCompletionsBackend` 见 [`AgentTurnTransport::llm_backend`]。
pub async fn run_agent_turn<'a>(
    p: RunAgentTurnParams<'a>,
) -> Result<(), crate::agent::agent_turn::RunAgentTurnError> {
    let RunAgentTurnParams {
        shared,
        session,
        transport,
        llm,
        attach,
        obs,
    } = p;
    let RunAgentTurnSharedInputs {
        client,
        api_key,
        cfg,
        tools,
    } = shared;
    let RunAgentTurnSession {
        messages,
        effective_working_dir,
        workspace_is_set,
    } = session;
    let RunAgentTurnAttach {
        long_term_memory,
        long_term_memory_scope_id,
        read_file_turn_cache,
        turn_allowed_tool_names,
        session_mode,
    } = attach;
    let RunAgentTurnObs {
        tracing_chat_turn,
        request_audit,
        process_handles,
    } = obs;
    let AgentTurnTransport {
        out,
        no_stream,
        cancel,
        per_flight,
        web_tool_ctx,
        sse_control_mirror,
        llm_backend,
        trace_sink,
    } = transport;
    let AgentTurnLlmOverrides {
        temperature_override,
        model_override,
        use_executor_model,
        executor_model_override,
        executor_api_base,
        executor_api_key,
        seed_override,
    } = llm;
    let turn_dump_scope_id = long_term_memory_scope_id.clone();
    let turn_dump_model_override = model_override.clone();
    let turn_dump_executor_model_override = executor_model_override.clone();
    let llm_backend = resolved_turn_llm_backend(llm_backend);

    let read_file_turn_cache =
        crate::agent_turn_prep::resolve_read_file_turn_cache_for_turn(cfg, read_file_turn_cache);

    let workspace_changelist = crate::agent_turn_prep::workspace_changelist_for_turn(
        cfg.as_ref(),
        process_handles.as_ref(),
        long_term_memory_scope_id.as_deref(),
    );

    let crate::agent_turn_prep::ToolsForTurnPrepared {
        tools_for_turn,
        mcp_turn,
        mcp_skipped,
    } = crate::agent_turn_prep::prepare_tools_for_turn(
        cfg,
        tools,
        effective_working_dir,
        turn_allowed_tool_names.as_ref().map(|a| a.as_ref()),
    )
    .await;
    emit_mcp_servers_skipped_notice(&mcp_skipped, out).await;

    let request_chrome_trace = crate::request_chrome_trace::request_trace_dir_from_env()
        .map(|_| Arc::new(crate::request_chrome_trace::RequestTurnTrace::new()));
    let wall_ms = std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .map(|d| d.as_millis() as u64)
        .unwrap_or(0);
    crate::turn_replay_dump::set_turn_replay_event_context(
        wall_ms,
        turn_dump_scope_id.as_deref(),
        tracing_chat_turn.as_ref().map(|t| t.job_id),
    );
    crate::turn_replay_dump::append_latest_user_input_event_if_configured(messages);
    crate::turn_replay_dump::append_turn_replay_event_json_if_configured(
        "turn_started",
        "run_agent_turn",
        Some(&serde_json::json!({
            "text": format!("wall_start_ms={wall_ms}"),
            "phase": "turn"
        })),
    );

    let mut loop_params = crate::agent::agent_turn::RunLoopParams {
        ctx: crate::agent::agent_turn::RunLoopCtx {
            core: crate::agent::agent_turn::RunLoopCore {
                llm_backend,
                client,
                api_key,
                cfg,
                tools_defs: tools_for_turn.as_slice(),
                effective_working_dir,
                workspace_is_set,
            },
            io: crate::agent::agent_turn::RunLoopIo {
                no_stream,
                cancel: cancel.as_deref(),
                control: crate::agent::agent_turn::TurnControlSink {
                    out,
                    sse_encoder: crate::sse::default_encoder(),
                    sse_control_mirror,
                },
            },
            attach: crate::agent::agent_turn::RunLoopAttach {
                web_tool_ctx,
                per_flight,
                long_term_memory,
                long_term_memory_scope_id,
                mcp_turn,
                read_file_turn_cache,
                workspace_changelist,
                turn_allowed_tool_names: turn_allowed_tool_names.clone(),
                session_mode,
            },
            obs: crate::agent::agent_turn::RunLoopObs {
                request_chrome_trace: request_chrome_trace.clone(),
                tracing_chat_turn: tracing_chat_turn.clone(),
                request_audit: request_audit.clone(),
                process_handles: Arc::clone(&process_handles),
                trace_sink,
            },
        },
        turn: crate::agent::agent_turn::RunLoopTurnState {
            messages_buf: messages,
            messages_revision: 0,
            sub_phase: crate::agent::agent_turn::AgentTurnSubPhase::Planner,
            turn_planner_hints: crate::agent::agent_turn::TurnPlannerHints::default(),
            temperature_override,
            model_override,
            use_executor_model,
            executor_model_override,
            executor_api_base,
            executor_api_key,
            seed_override,
            turn_budget: crate::agent::turn_budget::TurnBudgetCounter::new_shared(),
        },
    };

    let res = run_agent_turn_common_with_optional_trace(&mut loop_params, wall_ms).await;
    // 失败时向 trace_sink emit Error 事件（最小化 emit；完整 LLM/工具事件由后续 PR 接入）
    if let Err(e) = &res
        && let Some(sink) = loop_params.ctx.obs.trace_sink.as_ref()
    {
        sink.emit(crate::cm_llm::TraceEvent::Error {
            round: 0,
            kind: "turn_failed".to_string(),
            message: e.to_string(),
        })
        .await;
    }
    write_agent_turn_replay_dump(crate::turn_replay_dump::TurnReplayDumpParams {
        wall_ms,
        long_term_memory_scope_id: turn_dump_scope_id.as_deref(),
        tracing_job_id: tracing_chat_turn.as_ref().map(|t| t.job_id),
        result: &res,
        messages: loop_params.turn.messages(),
        tools: tools_for_turn.as_slice(),
        cfg: loop_params.ctx.core.cfg,
        no_stream,
        effective_working_dir,
        workspace_is_set,
        temperature_override,
        model_override: turn_dump_model_override,
        use_executor_model,
        executor_model_override: turn_dump_executor_model_override,
        seed_override,
    });
    res
}

async fn run_agent_turn_common_with_optional_trace(
    loop_params: &mut crate::agent::agent_turn::RunLoopParams<'_>,
    wall_ms: u64,
) -> Result<(), crate::agent::agent_turn::RunAgentTurnError> {
    let trace_span = loop_params
        .ctx
        .obs
        .tracing_chat_turn
        .as_ref()
        .map(|t| t.span.clone());
    let request_chrome_trace = loop_params.ctx.obs.request_chrome_trace.clone();
    let run_common = crate::agent::agent_turn::run_agent_turn_common(loop_params);
    match (trace_span, request_chrome_trace) {
        (Some(span), Some(t)) => {
            crate::request_chrome_trace::with_turn_trace(t, wall_ms, run_common.instrument(span))
                .await
        }
        (Some(span), None) => run_common.instrument(span).await,
        (None, Some(t)) => {
            crate::request_chrome_trace::with_turn_trace(t, wall_ms, run_common).await
        }
        (None, None) => run_common.await,
    }
}

fn write_agent_turn_replay_dump(params: crate::turn_replay_dump::TurnReplayDumpParams<'_>) {
    let wall_ms = params.wall_ms;
    let ok = params.result.is_ok();
    crate::turn_replay_dump::write_turn_replay_dump_if_configured(params);
    crate::turn_replay_dump::append_turn_replay_event_json_if_configured(
        "turn_finished",
        "run_agent_turn",
        Some(&serde_json::json!({
            "text": format!("wall_start_ms={wall_ms}, ok={ok}"),
            "phase": "turn"
        })),
    );
    crate::turn_replay_dump::clear_turn_replay_event_context();
}