# zcbot nginx 反代示例(蓝绿双实例,RUN.md §无感更新 B 档)。
#
# 安装(一次性):
#   sudo cp deploy/nginx/zcbot.conf.example /etc/nginx/conf.d/zcbot.conf   # 按需改 server_name/端口/TLS
#   echo 'server 127.0.0.1:8765;' | sudo tee /etc/nginx/zcbot_upstream.conf   # 初始指 blue
#   sudo nginx -t && sudo systemctl reload nginx
#
# 之后 zcbot_upstream.conf 由 deploy/update_bluegreen.sh 改写 + reload nginx 切流量,
# 本文件不再动。nginx reload 对已建立连接零影响:旧 SSE 留在旧实例自然收尾,新请求走新实例。

upstream zcbot_backend {
    # 只含一行 server 127.0.0.1:8765|8766;由 update_bluegreen.sh 维护
    include /etc/nginx/zcbot_upstream.conf;
    keepalive 32;
}

server {
    listen 80;
    # TODO 按部署域名改;上 TLS 时换 listen 443 ssl + 证书(certbot 等)
    server_name _;

    # 上传接口(/v1/files/upload)会传大文件;与后端无硬限制,给足余量
    client_max_body_size 512m;

    location / {
        proxy_pass http://zcbot_backend;
        proxy_http_version 1.1;
        # keepalive upstream 需要清掉 Connection 头
        proxy_set_header Connection "";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # ★ SSE(GET /v1/tasks/{id}/events):关 buffering、拉长 read 超时。
        # 后端响应头已带 X-Accel-Buffering: no(对 proxy_buffering 同效),这里显式
        # 再关一层作双保险;30s 服务端 ping 心跳 < read_timeout,长连接不会被掐。
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
    }
}