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Contents contributed and discussions participated by 張 旭

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張 旭

RolifyCommunity/rolify: Role management library with resource scoping - 0 views

github.com/...rolify

rails model role system permission

shared by 張 旭 on 10 Jun 17 - No Cached
  • 張 旭 on 09 Aug 17
     
    "resource"
張 旭

MySQL 到底能不能放到 Docker 里跑？ - 0 views

mp.weixin.qq.com/s

mysql server docker

shared by 張 旭 on 07 Aug 17 - No Cached
  • 忙碌又容易出错的工作其实是无意义的
  • 单机多实例运行 MySQL
  • MySQL 运行的就是个进程而且对 IO 要求比较高
  • ...12 more annotations...
  • Docker 的资源限制用的就是 cgroups
  • Percona：我们的备份、慢日志分析、过载保护等功能都是基于 pt-tools 工具包来实现的。
  • Consul：分布式的服务发现和配置共享软件
  • 容器调度的开源产品主要有 Kubernetes 和 mesos
  • 适合自己现状的需求才是最好的
  • 有机会做到计算调度和存储调度分离的情况下我们可能会转向 Kubernetes 的方案
  • 根据这个需求按照我们的资源筛选规则 (比如主从不能在同一台机器、内存配置不允许超卖等等)，从现有的资源池中匹配出可用资源，然后依次创建主从关系、创建高可用管理、检查集群复制状态、推送集群信息到中间件 (选用了中间件的情况下) 控制中心、最后将以上相关信息都同步到 CMDB。
    • 張 旭
      張 旭 on 07 Aug 17
       
      感覺用 K8S 就不用那麼麻煩了。
  • 每一个工作都是通过服务端发送消息到 agent，然后由 agent 执行对应的脚本，脚本会返回指定格式的执行结果
  • 备份工具我们是用 percona-xtrabackup
  • zabbix 来实现监控告警
  • grafana 是监控画图界的扛把子，功能齐全的度量仪表盘和图形编辑器，经过简单配置就能完成各种监控图形的展示。
  • (MariaDB 不支持写 table，只能写 file)，极大减少了从库复制带来的 IOPS。
張 旭

How to Test Rails Models with RSpec - Semaphore - 0 views

semaphoreci.com/...o-test-rails-models-with-rspec

rails model test rspec

shared by 張 旭 on 31 Jul 17 - No Cached
  • Behaviour-driven Development (BDD) as a software development process is composed of multiple subtechniques.
  • Models can sometimes be full-blown objects with rich behaviour.
  • An alternative is to use the shoulda gem.
  • ...3 more annotations...
  • reflect_on_association
  • add the business logic
  • Covering Edge Cases
張 旭

drapergem/draper: Decorators/View-Models for Rails Applications - 0 views

github.com/draper

rails model programming decorator

shared by 張 旭 on 04 Jul 17 - No Cached
  • The decorator wraps the model, and deals only with presentational concerns.
  • In the controller, you decorate the article before handing it off to the view
  • whenever you start needing logic in the view or start thinking about a helper method, you can implement a method on the decorator instead.
  • ...5 more annotations...
  • convert an existing Rails helper to a decorator method
  • That method is presentation-centric, and thus does not belong in a model.
  • Where does that come from? It's a method of the source Article, whose methods have been made available on the decorator by the delegate_all call above.
  • a great way to replace procedural helpers like the one above with "real" object-oriented programming
  • format complex data for user display
張 旭

Search and filter Rails models without bloating your controller - Justin Weiss - 0 views

www.justinweiss.com/...thout-bloating-your-controller

rails search development programming database model scope

shared by 張 旭 on 01 Jul 17 - No Cached
  • Rails includes scopes, which can provide you with a lot of what you need for simple searching, filtering, and sorting.
  • scope chaining
  • filtering and searching of your models with one line in the controller and one line in the model.
  • ...2 more annotations...
  • .public_send
  • ClassMethods
張 旭

Rails API Testing Best Practices - 0 views

matthewlehner.net/rails-api-testing-guidelines

rails api programming development

shared by 張 旭 on 29 Jun 17 - No Cached
  • Writing an API is almost a given with modern web applications
  • A properly designed API should return two things: an HTTP response status-code and the response body.
  • Testing the status-code is necessary
  • ...6 more annotations...
  • testing the response body should just verify that the application is sending the right content.
  • Unauthorized
  • Forbidden
  • Your test should also ensure that any desired business logic gets completed as expected.
  • Request specs provide a thin wrapper around Rails’ integration tests, and are designed to drive behavior through the full stack
  • we’ll be doing json = JSON.parse(response.body) a lot. This should be a helper method.
張 旭

dry-rb - Home - 0 views

dry-rb.org

ruby programming development

shared by 張 旭 on 02 Oct 16 - No Cached
張 旭

cryptography - What's the difference between SSL, TLS, and HTTPS? - Information Securit... - 0 views

security.stackexchange.com/...ence-between-ssl-tls-and-https

security ssl system https

shared by 張 旭 on 23 Jun 17 - No Cached
  • TLS is the new name for SSL
  • HTTPS is HTTP-within-SSL/TLS
  • SSL (TLS) establishes a secured, bidirectional tunnel for arbitrary binary data between two hosts
  • ...10 more annotations...
  • HTTP is meant to run over a bidirectional tunnel for arbitrary binary data; when that tunnel is an SSL/TLS connection, then the whole is called "HTTPS".
  • "SSL" means "Secure Sockets Layer".
  • "TLS" means "Transport Layer Security".
  • The name was changed to avoid any legal issues with Netscape so that the protocol could be "open and free" (and published as a RFC).
    • 張 旭
      張 旭 on 23 Jun 17
       
      看起來其實就指同一件事，只是講 TLS 可以避開 SSL 這個有產權糾紛的名諱。
  • not just Internet-based sockets
  • "HTTPS" is supposed to mean "HyperText Transfer Protocol Secure",
  • Other protocol acronyms have been built the same way, e.g. SMTPS, IMAPS, FTPS... all of them being a bare protocol that "got secured" by running it within some SSL/TLS.
  • To make the confusing perfect: SSL (secure socket layer) often refers to the old protocol variant which starts with the handshake right away and therefore requires another port for the encrypted protocol such as 443 instead of 80.
  • TLS (transport layer security) often refers to the new variant which allows to start with an unencrypted traditional protocol and then issuing a command (usually STARTTLS) to initialize the handshake.
  • Whether you use SSL or TLS for this depends on the configuration of your browser and of the server (there usually is an option to allow SSLv2, SSLv3 or TLS 1.x).
張 旭

Four-Phase Test - 0 views

robots.thoughtbot.com/four-phase-test

test programming development

shared by 張 旭 on 20 Jun 17 - No Cached
張 旭

How To: Manage users through a CRUD interface · plataformatec/devise Wiki - 0 views

github.com/...users-through-a-CRUD-interface

rails devise authentication

shared by 張 旭 on 19 Jun 17 - No Cached
  • Make sure to put your resources :users below the devise_for :users route.
  • the registration routes and user managing routes can conflict
  • remove the password key of the params hash if it’s blank
張 旭

Form Helpers - Ruby on Rails Guides - 0 views

guides.rubyonrails.org/form_helpers.html

rails form framework ruby html

shared by 張 旭 on 18 Jun 17 - Cached
  • While the *_tag helpers can certainly be used for this task they are somewhat verbose as for each tag you would have to ensure the correct parameter name is used and set the default value of the input appropriately.
  • For these helpers the first argument is the name of an instance variable and the second is the name of a method (usually an attribute) to call on that object.
  • must pass the name of an instance variable, i.e. :person or "person", not an actual instance of your model object.
  • ...2 more annotations...
  • provide a :namespace option for your form to ensure uniqueness of id attributes on form elements.
  • a form builder object (the f variable).
張 旭

Use swarm mode routing mesh | Docker Documentation - 0 views

docs.docker.com/...ingress

docker swarm cluster system server HA networking

shared by 張 旭 on 16 Jun 17 - No Cached
  • Docker Engine swarm mode makes it easy to publish ports for services to make them available to resources outside the swarm.
  • All nodes participate in an ingress routing mesh.
  • routing mesh enables each node in the swarm to accept connections on published ports for any service running in the swarm, even if there’s no task running on the node.
  • ...6 more annotations...
  • Port 7946 TCP/UDP for container network discovery
  • Port 4789 UDP for the container ingress network.
  • When you access port 8080 on any node, the swarm load balancer routes your request to an active container.
  • The routing mesh listens on the published port for any IP address assigned to the node.
  • publish a port for an existing service
  • To use an external load balancer without the routing mesh, set --endpoint-mode to dnsrr instead of the default value of vip
張 旭

Swarm mode key concepts | Docker Documentation - 0 views

docs.docker.com/...key-concepts

docker cluster system server HA

shared by 張 旭 on 16 Jun 17 - No Cached
  • The cluster management and orchestration features embedded in the Docker Engine are built using SwarmKit.
  • Docker engines participating in a cluster are running in swarm mode
  • A swarm is a cluster of Docker engines, or nodes, where you deploy services
  • ...19 more annotations...
  • When you run Docker without using swarm mode, you execute container commands.
  • When you run the Docker in swarm mode, you orchestrate services.
  • You can run swarm services and standalone containers on the same Docker instances.
  • A node is an instance of the Docker engine participating in the swarm
  • You can run one or more nodes on a single physical computer or cloud server
  • To deploy your application to a swarm, you submit a service definition to a manager node.
  • Manager nodes also perform the orchestration and cluster management functions required to maintain the desired state of the swarm.
  • Manager nodes elect a single leader to conduct orchestration tasks.
  • Worker nodes receive and execute tasks dispatched from manager nodes.
  • service is the definition of the tasks to execute on the worker nodes
  • When you create a service, you specify which container image to use and which commands to execute inside running containers.
  • replicated services model, the swarm manager distributes a specific number of replica tasks among the nodes based upon the scale you set in the desired state.
  • global services, the swarm runs one task for the service on every available node in the cluster.
  • A task carries a Docker container and the commands to run inside the container
  • Manager nodes assign tasks to worker nodes according to the number of replicas set in the service scale.
  • Once a task is assigned to a node, it cannot move to another node
  • If you do not specify a port, the swarm manager assigns the service a port in the 30000-32767 range.
  • External components, such as cloud load balancers, can access the service on the PublishedPort of any node in the cluster whether or not the node is currently running the task for the service.
  • Swarm mode has an internal DNS component that automatically assigns each service in the swarm a DNS entry.
張 旭

File: README - Documentation by YARD 0.8.7.6 - 0 views

rspec.info/...rspec-core

rails ruby test programming rspec

shared by 張 旭 on 14 Jun 17 - No Cached
  • we can express concepts like a conversation
    • 張 旭
      張 旭 on 14 Jun 17
       
      描述 order 這個東西。 order 就是將登記在它上面的物品價格加總起來。
  • The describe method creates an ExampleGroup.
  • ...15 more annotations...
  • declare examples using the it method
  • an example group is a class in which the block passed to describe is evaluated
  • The blocks passed to it are evaluated in the context of an instance of that class
  • nested groups using the describe or context methods
  • can declare example groups using either describe or context
  • can declare examples within a group using any of it, specify, or example
  • Declare a shared example group using shared_examples, and then include it in any group using include_examples.
  • Nearly anything that can be declared within an example group can be declared within a shared example group.
  • shared_context and include_context.
  • When a class is passed to describe, you can access it from an example using the described_class method
  • rspec-core stores a metadata hash with every example and group
  • Example groups are defined by a describe or context block, which is eagerly evaluated when the spec file is loaded
  • Examples -- typically defined by an it block -- and any other blocks with per-example semantics -- such as a before(:example) hook -- are evaluated in the context of an instance of the example group class to which the example belongs.
  • Examples are not executed when the spec file is loaded
  • run any examples until all spec files have been loaded
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