Redis与nginx回调配置

Question

我正在尝试使用redis配置我的nginx。我希望nginx检查redis缓存密钥是否存在，然后将其作为响应返回。否则调用URL并创建redis缓存键并返​​回响应。为此，我使用resty-redis nginx插件。

这是我的nginx配置。如果缓存在redis中不可用，我很困惑如何进行调用。

init_by_lua 'initCall = 1';
server {
listen 80;

access_log /var/log/nginx/accessapill.log;
error_log /var/log/nginx/errorapill.log;

root /var/www/html/api/api;

# Add index.php to the list if you are using PHP
index index.php index.html index.htm index.nginx-debian.html;

charset utf-8;
charset_types application/json;
default_type application/json;

server_name apill.com;

location / {
        content_by_lua_block {
            if (initCall == 1) then
                initCall = 0
                local args = ngx.req.get_uri_args()
                local keyset={}
                local n=0
                for key, val in pairs(args) do
                     n=n+1
                     keyset[n]=key.."="..val
                end
                --ngx.say("/readRedis" .. ngx.var.uri .. "?" .. table.concat(keyset, "&"))
                local response = ngx.location.capture("/readRedis" .. ngx.var.uri .. "?" .. table.concat(keyset, "&"))
                ngx.say(table.concat(response,""))
            end
        }

    # First attempt to serve request as file, then
    # as directory, then fall back to displaying a 404.
    #try_files $uri $uri/ =404;
    #try_files $uri $uri/ /index.php?$args;
}

location /readRedis {
    content_by_lua_block {
        local redis = require "resty.redis"
        local red = redis:new()
        local ok, err = red:connect("127.0.0.1", 6379)
        red:set_timeout(1000) -- 1 sec
        local calledUrl = ngx.var.uri
        calledUrl = calledUrl.gsub("/readRedis", "")
        local args = ngx.req.get_uri_args()
        local keyset={}
        local n=0
        for key, val in pairs(args) do
             n=n+1
             keyset[n]=key.."="..val
        end
        calledUrl = calledUrl .. "?" .. table.concat(keyset, "&");
        local keyVal, err = red:get(ngx.md5(calledUrl))
        if not(keyVal == nil) and (#keyVal > 0) then
            ngx.say(keyVal)
        else
            calledUrl = "/fallback" .. calledUrl .. "?" .. table.concat(keyset, "&")
            local response = ngx.location.capture(calledUrl)
            red:set(ngx.md5(calledUrl), response)
            red:expire(ngx.md5(calledUrl), 3600)
            ngx.say(response)
        end
    }
}

location /hello {
    content_by_lua_block {
        local args = ngx.req.get_uri_args()
        local keyset={}
        local n=0
        for key, val in pairs(args) do
                     n=n+1
                     keyset[n]=key.."="..val
        end
        ngx.say("/readRedis" .. ngx.var.uri .. "?" .. table.concat(keyset, "&"))
    }
}

location /fallback {
    resolver 127.0.0.1;
    if ($request_uri ~* "/fallback/(.*)") {
        proxy_pass  http://apill.com$1;
    }
}


location ~ \.php$ {
    root /var/www/html/api/api;
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
    fastcgi_index index.php;
    fastcgi_param  SCRIPT_FILENAME  /var/www/html/api/api/$fastcgi_script_name;
    include fastcgi_params;
    fastcgi_read_timeout 300;
}

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
#   include snippets/fastcgi-php.conf;
#
#   # With php5-cgi alone:
#   fastcgi_pass 127.0.0.1:9000;
#   # With php5-fpm:
#   fastcgi_pass unix:/var/run/php5-fpm.sock;
#}

# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
location ~ /\.ht {
    deny all;
}
}