为什么此Ruby代码无法写入日志文件? [英] Why does this Ruby code fail to write to the log file?

问题描述

一旦脚本被守护进程，记录器就无法再写入文件了.那么我应该如何以及何时初始化日志?

Once the script is daemonized then the logger can't write to the file anymore. So how and when should I initialise the log?

require 'rubygems'
require 'daemons'
require 'logging'

def create_new_logger
    logger = Logging.logger['trend-analyzer']
    logger.add_appenders(
        Logging.appenders.rolling_file('./logs/trend-analyzer.log'),
        Logging.appenders.stdout
    )
    logger.level = :debug
    return logger
end

logger = create_new_logger

#this log message gets written to the log file
logger.debug Time.new 

Daemons.run_proc('ForestPress', :log_dir => '.logs', :backtrace => true) do
    running_as_daemon = true

    #this log message does NOT get written to the log file
    logger.debug Time.new

    loop do
        #this log message does NOT get written to the log file
        logger.info Time.new    
        sleep 5 
    end
end

---

编辑

我注意到当前路径从执行脚本的位置更改为/.这可能是为什么我无法记录消息的原因吗?

I notice the current path changes from where I executed the script to /. Could this be why I can't log messages?

编辑2

我现在在成为守护程序之前保存了原始路径，然后使用Dir.chdir将路径设置为原始路径.然后，我可以直接打开文件并写入文件.但是，记录中的gem仍无法写入.

I now save the original path before becoming a daemon and then use Dir.chdir to set the path to the original path. I can then open the file directly and write to it. However the logging gem can't write to it still.

推荐答案

这是它开始工作的方式

require 'rubygems'
require 'daemons'
require 'logging'

def create_new_logger
    logger = Logging.logger['trend-analyzer']
    logger.add_appenders(
        Logging.appenders.rolling_file('./logs/trend-analyzer.log'),
        Logging.appenders.stdout
    )
    logger.level = :debug
    return logger
end

current_dir = Dir.pwd

Daemons.run_proc('ForestPress', :log_dir => '.logs', :backtrace => true) do
    Dir.chdir(current_dir)  

    logger = create_new_logger

    loop do
        puts Dir.pwd
        logger.debug Time.new   
        sleep 5 
    end
end

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