liujinxia (liujinxia)

libgit2 是如何绑定到其他语言的

liujinxia — Sun, 02 Oct 2016 22:00:26 +0800

看了社区里 gitlab 的一篇文章，很好奇 libgit2 这个 c 语言写的程序是怎么绑定到其他语言的，比如 Ruby 的 rugged。

是在 rugged 中调用 libgit2 中的方法吗？

GitLab 发送邮件失效，使用 ActionMailer 和 postfix

liujinxia — Wed, 21 Sep 2016 13:30:56 +0800

求支招，自己的私有 gitlab 服务器，配置了 ActionMailer，用 smtp 来发送通知邮件。配置如下：

if Rails.env.production?
  Gitlab::Application.config.action_mailer.delivery_method = :smtp

  ActionMailer::Base.smtp_settings = {
    address: "smtp.163.com",
    port: 25,
    user_name: "*****************",
    password: "**************",
    domain: "163.com",
    authentication: :login,
    enable_starttls_auto: false,
    openssl_verify_mode: 'none' # See ActionMailer documentation for other possible options
  }
end

用的是 163 邮箱服务器，向其他用户发送通知邮件。

前段时间是可以正常发送通知邮件的，这几天不知什么原因，收不到邮件了，检查 sidekiq 的日志如下：

Sidekiq::Extensions::DelayedMailer JID-b694bbc959b6972dec24430c INFO: start
2016-09-21T00:11:42.086Z 30161 TID-ouhh3htik Sidekiq::Extensions::DelayedMailer JID-b694bbc959b6972dec24430c INFO: fail: 30.018 sec
2016-09-21T00:11:42.087Z 30161 TID-ouhh3htik WARN: {"retry"=>true, "queue"=>"default", "class"=>"Sidekiq::Extensions::DelayedMailer", "args"=>["---\n- !ruby/class 'Notify'\n- :new_ssh_key_email\n- - 874\n"], "jid"=>"b694bbc959b6972dec24430c", "enqueued_at"=>1474169870.4743142, "error_message"=>"execution expired", "error_class"=>"Net::OpenTimeout", "failed_at"=>1474169908.4454546, "retry_count"=>17, "retried_at"=>1474416702.0864198}
2016-09-21T00:11:42.087Z 30161 TID-ouhh3htik WARN: execution expired
2016-09-21T00:11:42.087Z 30161 TID-ouhh3htik WARN: /usr/local/lib/ruby/2.1.0/net/smtp.rb:541:in `initialize'
/usr/local/lib/ruby/2.1.0/net/smtp.rb:541:in `open'
/usr/local/lib/ruby/2.1.0/net/smtp.rb:541:in `tcp_socket'
/usr/local/lib/ruby/2.1.0/net/smtp.rb:551:in `block in do_start'
/usr/local/lib/ruby/2.1.0/timeout.rb:91:in `block in timeout'
/usr/local/lib/ruby/2.1.0/timeout.rb:101:in `call'
/usr/local/lib/ruby/2.1.0/timeout.rb:101:in `timeout'
/usr/local/lib/ruby/2.1.0/net/smtp.rb:550:in `do_start'
/usr/local/lib/ruby/2.1.0/net/smtp.rb:520:in `start'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/mail-2.6.4/lib/mail/network/delivery_methods/smtp.rb:113:in `deliver!'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/mail-2.6.4/lib/mail/message.rb:2149:in `do_delivery'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/mail-2.6.4/lib/mail/message.rb:237:in `block in deliver'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/actionmailer-4.1.14.1/lib/action_mailer/base.rb:527:in `block in deliver_mail'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.14.1/lib/active_support/notifications.rb:159:in `block in instrument'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.14.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.14.1/lib/active_support/notifications.rb:159:in `instrument'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/actionmailer-4.1.14.1/lib/action_mailer/base.rb:525:in `deliver_mail'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/mail-2.6.4/lib/mail/message.rb:237:in `deliver'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/extensions/action_mailer.rb:32:in `deliver'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/extensions/action_mailer.rb:20:in `perform'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/processor.rb:75:in `execute_job'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/processor.rb:52:in `block (2 levels) in process'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/chain.rb:127:in `call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/chain.rb:127:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidetiq-0.6.3/lib/sidetiq/middleware/history.rb:8:in `call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/chain.rb:129:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/server/active_record.rb:6:in `call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/chain.rb:129:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/server/retry_jobs.rb:74:in `call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/chain.rb:129:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/server/logging.rb:11:in `block in call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/logging.rb:22:in `with_context'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/server/logging.rb:7:in `call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/chain.rb:129:in `block in invoke'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/chain.rb:132:in `call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/middleware/chain.rb:132:in `invoke'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/sidekiq-3.3.0/lib/sidekiq/processor.rb:51:in `block in process'
"sidekiq.log" [readonly] 11741L, 1309001C

我不太了解 163 邮箱服务器，postfix 和目标邮箱服务器之间是怎么交互的，google 了一下尝试在服务器上上用命令： telnat smtp.163.com 25 来连接 163 的邮箱服务器，结果一直连不上

telnet smtp.163.com 25
Trying 220.181.12.14...
Trying 220.181.12.15...
Trying 220.181.12.16...

不知道跟这个有没有关系，目前这个问题还没有解决，求助同志们

Ruby 方法传递实例变量的问题

liujinxia — Wed, 04 May 2016 07:27:11 +0800

求教一个问题，我想把一个实例变量作为参数传递给方法，类似：

def get_message(@data)
 ..
end

但是会报 formal arguement cannot be instance variable 那么我怎么把一个实例变量仍然传递给一个方法呢？

如何彻底删除一个 controller 里的 action

liujinxia — Mon, 04 Jan 2016 10:02:04 +0800

一个开发好的 Rails 项目，想要删除一些功能。但是这个功能包括几个 controller，也包括几个 controller 里的 action。怎么能删除这个 controller 或者 action 的时候把调用的地方也找到删掉呢？

Ruby 解密 AES

liujinxia — Mon, 30 Nov 2015 17:16:06 +0800

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex

class AESCrypto():
    def __init__(self,key):
        self.key = key
        self.mode = AES.MODE_CBC

    #加密函数，如果text不足16位就用空格补足为16位，
    #如果大于16当时不是16的倍数，那就补足为16的倍数。
    def encrypt(self,text):
        cryptor = AES.new(self.key,self.mode,b'0000000000000000')   
        #这里密钥key 长度必须为16（AES-128）,
        #24（AES-192）,或者32 （AES-256）Bytes 长度
        #目前AES-128 足够目前使用
        length = 16
        count = len(text)
        if count < length:
            add = (length-count)
            text = text + ('\0' * add)
        elif count > length:
            add = (length-(count % length))
            text = text + ('\0' * add)
        self.ciphertext = cryptor.encrypt(text)
        #因为AES加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题
        #所以这里统一把加密后的字符串转化为16进制字符串
        return b2a_hex(self.ciphertext)

    #解密后，去掉补足的空格用strip() 去掉
    def decrypt(self,text):
        cryptor = AES.new(self.key,self.mode,b'0000000000000000')
        plain_text  = cryptor.decrypt(a2b_hex(text))
        return plain_text.rstrip('\0')

if __name__ == '__main__':
    pc = AESCrypto('123456789') #初始化密钥
    e = pc.encrypt('MhpPUwqNAsLehj1VRQmo8eLiQumNPAif7YZAuSW6')
    print "e=",e    
    d = pc.decrypt(e) #解密
    print "加密:",e
    print "解密:",d

这是一个用 Python 实现的AES加密解密方法，我现在需要使用Ruby来实现其中的解密方法，但是那个 b'0000000000000000'不知道是什么东西，写了一部分如下：

require 'openssl'
require 'base64'
class Test

    token_encry = "c8fd20f158163fcfe2b41ef546ec7b4af0caeb65fbfd1128090335f6640effa819aae009a036acf020162613f08fcb01"    
    decipher = OpenSSL::Cipher.new("AES-256-CBC")
    decipher.decrypt
    decipher.key = "123456789"

    decipher.padding = 0
    re = [token_encry].pack('H*')
    puts "re====#{re}"
    result = decipher.update([token_encry].pack('H*')) << decipher.final          
    puts result
    return result
end

查了很多资料，也找不到怎么能得出一样的结论。？_?