noob (noob)

Thread.current 是否保证对一个响应可用且私有吗？

noob — Tue, 17 Oct 2023 19:40:00 +0800

多个请求，偶尔出现共享感觉简化的代码如下：

  def current_user
    return kite_verify(token) if xxxx # 小程序

   verify(token) || raise(ActionController::InvalidAuthenticityToken, 'UnauthorizedError') # web页面登陆
  end

private

def kite_verify
    id, _ = 解析token获取id
    User.find_by(id: id)
end

def verify
    id, company = 解析token获取id, company
    User.find_by(id: id)
    Thread.current[:company] = company
end

接口：/test/company

def company
  render json: {company:  Thread.current[:company]}
end

出现状况：同一个用户 id，小程序登陆，web 登陆不同公司的登陆，小程序能获取到 Thread.current[:company] 的值。

小程序打印出的Thread.current： <Thread:0x00000001049de928@puma threadpool 001  xxx>
web页面登录打印出的Thread.current ： <Thread:0x00000001049bfa78@puma threadpool 003  xxxx>

请教一下具体什么原因

gem install mysql2 报错：Make sure that `gem install mysql2 -v '0.3.20' --source 'https://rubygems.org/'` succeeds before bundling.

noob — Sat, 13 Apr 2019 21:01:19 +0800

本机信息

Mac 10.1.4.4
ruby 2.3.1
mysql 已安装服务已启动

报错信息

Fetching mysql2 0.3.20
Installing mysql2 0.3.20 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
client.c:367:33: warning: implicit conversion loses integer precision: 'long' to 'unsigned int' [-Wshorten-64-to-32]
        elapsed_time = end_time - start_time;
                     ~ ~~~~~~~~~^~~~~~~~~~~~
client.c:439:3: error: use of undeclared identifier 'my_bool'
  my_bool res = mysql_read_query_result(client);
  ^
client.c:441:19: error: use of undeclared identifier 'res'
  return (void *)(res == 0 ? Qtrue : Qfalse);
                  ^
client.c:775:3: error: use of undeclared identifier 'my_bool'
  my_bool boolval;
  ^
client.c:806:7: error: use of undeclared identifier 'boolval'
      boolval = (value == Qfalse ? 0 : 1);
      ^
client.c:807:17: error: use of undeclared identifier 'boolval'
      retval = &boolval;
                ^
client.c:810:10: error: use of undeclared identifier 'MYSQL_SECURE_AUTH'; did you mean 'MYSQL_DEFAULT_AUTH'?
    case MYSQL_SECURE_AUTH:
         ^~~~~~~~~~~~~~~~~
         MYSQL_DEFAULT_AUTH
/usr/local/Cellar/mysql/8.0.15/include/mysql/mysql.h:188:3: note: 'MYSQL_DEFAULT_AUTH' declared here
  MYSQL_DEFAULT_AUTH,
  ^
client.c:811:7: error: use of undeclared identifier 'boolval'
      boolval = (value == Qfalse ? 0 : 1);
      ^
client.c:812:17: error: use of undeclared identifier 'boolval'
      retval = &boolval;
                ^
client.c:843:38: error: use of undeclared identifier 'boolval'
        wrapper->reconnect_enabled = boolval;
                                     ^
client.c:1165:56: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'unsigned int' [-Wshorten-64-to-32]
  mysql2rb = mysql2_mysql_enc_name_to_rb(charset_name, charset_name_len);
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~               ^~~~~~~~~~~~~~~~
client.c:1198:38: error: use of undeclared identifier 'MYSQL_SECURE_AUTH'; did you mean 'MYSQL_DEFAULT_AUTH'?
  return _mysql_client_options(self, MYSQL_SECURE_AUTH, value);
                                     ^~~~~~~~~~~~~~~~~
                                     MYSQL_DEFAULT_AUTH
/usr/local/Cellar/mysql/8.0.15/include/mysql/mysql.h:188:3: note: 'MYSQL_DEFAULT_AUTH' declared here
  MYSQL_DEFAULT_AUTH,
  ^
2 warnings and 10 errors generated.
make: *** [client.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/apple/.rvm/gems/ruby-2.3.1/gems/mysql2-0.3.20 for inspection.
Results logged to /Users/apple/.rvm/gems/ruby-2.3.1/extensions/x86_64-darwin-18/2.3.0/mysql2-0.3.20/gem_make.out

An error occurred while installing mysql2 (0.3.20), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.20' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  mysql2

参考信息

brew unlink mysql
brew cleanup
brew install mysql
gem install mysql2

不起作用前辈们有没有遇到这种情况，求助

执行 bundle install 报错： Could not load OpenSSL.

noob — Sat, 13 Apr 2019 20:10:10 +0800

本级版本以及 ruby 版本

Mac 10.14.4 ruby 2.3.1 openssl 已安装

报错具体信息

执行 bundle install 错误信息：

$ bundle install           
Could not load OpenSSL.
You must recompile Ruby with OpenSSL support or change the sources in your Gemfile from 'https' to 'http'. Instructions for compiling with OpenSSL using RVM are available at rvm.io/packages/openssl.

按着提示信息将 https 更改为 http 不起作用，使用 source 'https://gems.ruby-china.com' 也不起作用

参考的连接

issues_197 也不起作用

各位有遇到这种情况是怎么解决的，求助，折腾一天了，还没解决

这样设计合理吗

noob — Tue, 04 Sep 2018 15:04:00 +0800

一个数据表中 50 多个字段，合理吗？
表中明明有关联字段，还要存很多关联表中的其他字段，说是为了查询方便，合理吗？

已解决 Rails transaction 引起 MySQL 死锁问题

noob — Fri, 17 Jun 2016 18:21:50 +0800

问题截图

出现问题之后：在 mysql shell 中执行 insert into fin_user_accounts(xx,xx,xx) values(xx,xx,xx)。

返回错误信息：Lock wait timeout exceeded; try restarting transaction

引起问题出现的代码如下：

def create_account profile
  Fin::UserAccount.transaction do
    # 创建资金账号
    ua = Fin::UserAccount.create_account profile
    # 更新会员关联表的ID
    profile.update_user_account_id(ua.id)
  end
end


# 如果还没有资金账户，创建资金账户
  if profile.user_account_id.nil?
    fin_account_service = UserFinAccountService.new
    fin_account_service.request = @request
    if !fin_account_service.create_account profile
      charge_request.errors.add_to_base("创建资金账户失败。")
      return order
    end
  end
  order.user_account_id = profile.user_account_id

之前直接在数据库中添加了一条资金账号数据但并没有更新对应的会员表数据，之后再进行充值时，会报上图出现错误，便手动在数据库中把会员表中的数据更新，暂时解决。但是之后使用新用户有出现同样问题。

查询了：show processlist; +---------------+--------+-------------------------------------------------------------------------+ | command | state | info | +---------------+----------- +---------------------------------------------------------------------+ | QUERY | UPDATE | insert into fin_user_accounts(xx,xx,xx) values(xx,xx,xx) | +---------+-----+-------+---------------------------------------------------------------------------+ （猜想是否程序还在等待 profile.update_user_account_id(ua.id)操作）

show innodb status

*************************** 1. row ***************************
  Type: InnoDB
  Name: 
Status: 
=====================================
160618 11:42:40 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 46 seconds
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 3022, signal count 3022
Mutex spin waits 0, rounds 15701, OS waits 8
RW-shared spins 6958, OS waits 3009; RW-excl spins 5, OS waits 5
------------
TRANSACTIONS
------------
Trx id counter 0 29446433
Purge done for trx's n:o < 0 29446407 undo n:o < 0 0
History list length 40
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0 0, not started, process no 2687, OS thread id 2708777872
MySQL thread id 19282, query id 133303 localhost root
show innodb status
---TRANSACTION 0 0, not started, process no 2687, OS thread id 2767657872
MySQL thread id 19278, query id 132619 127.0.0.1 root
---TRANSACTION 0 0, not started, process no 2687, OS thread id 2764352400
MySQL thread id 19266, query id 133301 127.0.0.1 root
---TRANSACTION 0 29446432, not started, process no 2687, OS thread id 2764553104
MySQL thread id 19263, query id 133302 127.0.0.1 root
---TRANSACTION 0 0, not started, process no 2687, OS thread id 2764954512
MySQL thread id 19259, query id 132249 127.0.0.1 root
---TRANSACTION 0 29446426, not started, process no 2687, OS thread id 2708978576
MySQL thread id 19257, query id 132791 192.168.1.150 root
---TRANSACTION 0 29446239, not started, process no 2687, OS thread id 2766052240
MySQL thread id 19207, query id 122339 127.0.0.1 root
---TRANSACTION 0 29445785, not started, process no 2687, OS thread id 2765355920
MySQL thread id 11, query id 1821 127.0.0.1 root
---TRANSACTION 0 29445848, ACTIVE 58874 sec, process no 2687, OS thread id 2768038800
2 lock struct(s), heap size 320, 1 row lock(s), undo log entries 1
MySQL thread id 10, query id 3725 127.0.0.1 root
--------
FILE I/O
--------
I/O thread 0 state: waiting for i/o request (insert buffer thread)
I/O thread 1 state: waiting for i/o request (log thread)
I/O thread 2 state: waiting for i/o request (read thread)
I/O thread 3 state: waiting for i/o request (write thread)
Pending normal aio reads: 0, aio writes: 0,
 ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
Pending flushes (fsync) log: 0; buffer pool: 0
26327 OS file reads, 350 OS file writes, 243 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 5, seg size 7,
3 inserts, 3 merged recs, 3 merges
Hash table size 276707, node heap has 2 buffer(s)
16.74 hash searches/s, 6.80 non-hash searches/s
---
LOG
---
Log sequence number 12 3680676575
Log flushed up to   12 3680676575
Last checkpoint at  12 3680676575
0 pending log writes, 0 pending chkp writes
155 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 81330832; in additional pool allocated 1048576
Dictionary memory allocated 359936
Buffer pool size   4096
Free buffers       0
Database pages     4094
Modified db pages  0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages read 128174, created 0, written 183
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Main thread process no. 2687, id 2719468432, state: sleeping
Number of rows inserted 6, updated 36, deleted 0, read 2135875
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 22.22 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================

1 row in set, 1 warning (0.00 sec)

ERROR: 
No query specified

还请各位前辈指点迷津，谢谢。

解决方法：show processlist;然后 kill 掉 status = sleep

ActiveRecord 该如何缓存 SQL 查询出来的数据

noob — Thu, 24 Sep 2015 10:58:25 +0800

各路神仙请显灵，该如何实现：可以缓存@ placements 里的数据，同时 placements 表中数据是会变化的，可否设置缓存时间，缓存失效后，重新查询 placements 表。

require 'active_record'

ActiveRecord::Base.establish_connection(:adapter => "mysql2", :host => "10.1.1.130", :username => "xmo_prd", :database => "xmo", :encoding => "utf8", :password => "MWc200bs",)

class Plecement < ActiveRecord::Base
  @placements =ActiveRecord::Base.connection.execute("select id, placement_name from placements").collect { |e| [e[0], e[1]] }

  def self.tv_source(uid,placement_id)
    return "" if (placement_id.nil? && uid.nil?)
    uid.empty? ? @placements.detect { |e| placement_id == e[0]}[1].split("_")[0] : uid.split("_")[0]
  end
end

书不在多，精读才行

noob — Wed, 16 Sep 2015 14:53:12 +0800

山不在高，有仙则灵，水不在深，有龙则灵，书不在多，精读才行。希望各位高人，能提供本重构的书，ruby 进阶的书 ps：这样写是不是标题党啊？

HR 该不该这样做

noob — Tue, 15 Sep 2015 11:43:05 +0800

面试隔天接到 hr 的通知电话，告诉我税前的工资是多少，然后问我知道税后是多少，我说应该是**k 吧，hr 随后问什么时候能来上班啊。。。。。，上班的第一天休息时间，同学打电话的时候突然聊到工资，得知我们税后不一样，遂问 hr 我税后到底是多少，hr 回答：你是想比 Offer 吗？气急：难道我连自己税后的工资都没有知情权吗？hr：具体是多少我也不知道，你自己去网上算算吧，和网上九米算的差不多。ps（我去，神马 xx）。最后只能等到月末，发现竟比预算少 1k。

ps 大家一定要问清楚税后，不要像我一样以为是这些，同时还想问一下，难道 hr 不该把税后工资告诉我吗？

北京好多拆迁的

noob — Fri, 31 Jul 2015 15:25:56 +0800

北京好多拆迁的，住了好几年的地方就要走了，还是蛮怀念的

Ruby map、each、select、inject、collect 、detect reference

noob — Fri, 31 Jul 2015 15:06:56 +0800

感觉在像写个人日志一样，这些小知识不知道能不能帮到大家，同时也希望大牛们多多指教，多多传授一下工作中常用的技术或者方法，小菜谢过了

map：(collect 是 map 的别名函数)

对数组中每个元素进行表达式操作，原始数组不会被改变，返回执行表达式结果的新数组

[1,2,3,4,5,6,7,8,9,10].map{|e| e*3}  
=> [3, 6, 9, 12, 15, 18, 21, 24, 27, 30] 
[1,2,3,4,5,6,7,8,9,10].collect{|e| e == 3} 
=>[false, false, true, false, false, false, false, false, false, false]

each： 常用作数组的循环操作，对循环的参数做表达式操作，原数组不会被改变，返回原始数组

eg：[1,2,3,4,5,6,7,8,9,10].each{|e| print e.to_s + "###"} 
    => 1###2###3###4###5###6###7###8###9###10### =>返回 [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

select： 相当于过滤器，返回符合表达式元素的新数组，如果所有都不符合表达式则返回空数组

 eg：[1,2,3,4,5,6,7,8,9,10].select{|e| e == 3}
   =>  [3] 
eg：[1,2,3,4,5,6,7,8,9,10].select{|e| e*3}
  => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

detect：（find 的别名函数） 返回列表中第一个符合条件的元素

eg：[1,2,3,4,5,6,7,8,9,10].detect{|e| e == 3 || e == 2}
   =>  2

inject: 在所声明的容器中注入符合条件的元素，累加器作用

eg：[1,2,3,4,5,6,7,8,9,10].inject{ |sum,e| sum += e } 其中sum为所声明的注入器 将累加后的结果最后注入到sum中并返回注入器最后结果
eg：[1,2,3,4,5,6,7,8,9,10].inject{|result,elem| result + elem} => 55
  此时inject没有带参数，这是result会为数组中第一个元素，elem为第二个元素，依次累加返回最后结果 
eg:  {1 => 'a',2 => 'b',3 =>'c'}.inject({}){|key,value| value} key => {} value => [3,'c']

reject: 去除列表中符合条件的元素

eg：[1,2,3,4,5,6,7,8,9,10].reject{|e| e==2 || e==8}
   => [1, 3, 4, 5, 6, 7, 9, 10]

使用 Capsitrano 部署 Sinatra 项目

noob — Fri, 31 Jul 2015 15:02:22 +0800

第一次发帖，请各位多多指教，新人在此谢过了，格式不太好，以后会多多注意的 1：首先在 Gemfile 中加入

 group :development do
     gem 'capistrano'
     gem 'capistrano-chruby'
     gem 'capistrano-rvm'
     gem 'capistrano-bundler'
end

2：bundle install 安装 capistrano 3：执行结果：

  dongchaodeMacBook-Pro:happy iclick$ capify .
--------------------------------------------------------------------------------
Capistrano 3.x is incompatible with Capistrano 2.x.

This command has become `cap install` in Capistrano 3.x

For more information see http://www.capistranorb.com/
————————————————————————————————————————

4：执行 cap install 执行结果

dongchaodeMacBook-Pro:happy iclick$ cap install
mkdir -p config/deploy
create config/deploy.rb
create config/deploy/staging.rb
create config/deploy/production.rb
mkdir -p lib/capistrano/tasks
create Capfile
Capified

5：配置发布项目的一些属性 1）在 config/deploy.rb 中加入如下例子：（根据不同的项目更改不同的配置信息）

# config valid only for current version of Capistrano
lock '3.4.0'

set :application, 'redis_move'   #项目的名称

set :repo_url, 'ssh://xmo@10.1.1.172:2727/share/xmo/redis_move'  #得到项目源码地址

set :branch,'flush_code'  # 远程分支

set :deploy_to, '/opt/redis_move'  #发布到服务器的存储地址


set :bundle_flags, '--deployment' 

set :bundle_gemfile, -> { release_path.join('Gemfile') } 
注： bundle_gemfile 和bundle_flags 发布的时候自动执行bundle，还需要将 根目录下Capfile中得require 'capistrano/bundler'注释解开

set :chruby_ruby, 'ruby-2.1.3'

set :rvm_ruby_version, 'ruby-2.1.3'

set :stages, %w(staging production)

set :default_stage, "production"

注：set：stages 中后面的值和 config/deploy/下面的文件名称相对应 default_stage 默认执行 production 中得配置（其中配置内容 eg：server '10.21.20.124', user: 'xmo', roles: %w{web}）

set :scm, :git #默认使用git

set :linked_files, fetch(:linked_files, []).push("config.ru")
 #添加一些项目中不变更的配置信息这些配置文件会被放在shared中，作用是将shared中得文件链接到repo下来的项目中，
注：首先shared中得文件事先scp上去，否则会报错


set :linked_dirs, fetch(:linked_dirs, []).push('log', 'tmp/pids', 'tmp/cache', 'tmp/sockets', 'vendor/bundle', 'public/system')
# 是将项目的指定目录链接到shared目录中。这个操作会在从repo取下代码之后进行

# Default value for keep_releases is 5
set :keep_releases, 5

#每次发布完成之后使用thin重启服务
namespace :deploy do
    task :start do
        on roles(:web),in: :sequence, wait: 3 do
            within release_path do
                execute "cd /opt/redis_move/current;bundle exec thin -P tmp/rack.pid -e production -p 9191 -l logs/thin.log -d start"
           end
       end
end

task :stop do
    path = File.expand_path("..", __FILE__)
    file_path = File.join(path, "tmp/rack.pid")
    if File.exist?(file_path) then
       File.open(file_path) do |file|
           pid = file.read
          system("kill -9 #{pid}")
       end
     FileUtils.rm file_path
  end
end

task :restart => [:stop, :start]

after :published, :restart


end

上传服务器之后的文件列表图片更多详细信息：https://ruby-china.org/topics/18616