【Redis】多级缓存之OpenResty：nginx查询Tomcat与Redis以及nginx本地缓存

# 在OpenResty中配置多级缓存
 
http {
    # ...
 
    upstream tomcat_server {
        server 127.0.0.1:8080;
    }
 
    server {
        listen 80;
 
        # 配置本地缓存
        location /local_cache/ {
            # 设置本地缓存存储路径
            proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=my_cache:10m max_size=10g inactive=60m use_temp_path=off;
 
            # 启用缓存
            proxy_cache my_cache;
 
            # 缓存有效期
            proxy_cache_valid 200 1d;
 
            # 代理设置
            proxy_pass http://tomcat_server;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 
            # 设置缓存键
            proxy_cache_key $uri$is_args$args;
        }
 
        # 配置Redis缓存
        location /redis_cache/ {
            # 设置Redis连接参数
            set $redis_key $uri$is_args$args;
            redis_pass 127.0.0.1:6379;
 
            # 设置缓存查询失败时的回退处理
            default_type text/plain;
            error_page 404 = @tomcat;
 
            # 从Redis缓存中获取数据
            redis_code 200 "get $redis_key";
 
            # 设置缓存有效期
            redis_code 200 "expire $redis_key 1d";
        }
 
        # 请求未命中Redis缓存时，代理到Tomcat服务器
        location @tomcat {
            proxy_pass http://tomcat_server;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 
            # 将响应数据存储到Redis缓存中
            proxy_store on;
            proxy_store_access user:rw group:rw all:rw;
            proxy_temp_path /data/nginx/temp;
            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_pass_request_body off;
            proxy_pass_request_headers on;
            proxy_connect_timeout 10s;
            proxy_send_timeout 10s;
            proxy_read_timeout 10s;
 
            # 设置数据存储到Redis的键和过期时间
            set $redis_key $uri$is_args$args;
            set_by_lua_block $redis_expire $msec {
                return tonumber(ngx.var.msec) + 86400000;
            }
            lua_shared_dict msec 1m;
            lua_shared_dict redis_commands 1m;
            content_by_lua_block {
                local msec = ngx.shared.msec