pofresh-admin

pofresh-admin is an admin console library for pofresh. It provides the a series of utilities to monitor the pofresh server clusters.

Installation

npm install pofresh-admin

Basic conception

Process roles

There are three process roles in pofresh-admin: master, monitor and client.

• master - the master server process, collects and maintains all the client and monitor status and exports the cluster status for the clients.

• monitor - monitor proxy, in every server process which needs to be monitored. It should be started during the process starts and registers itself to the master server and reports the monitored process status to the master.

• client - pofresh-admin client process that fetches the status from master server, such as pofresh-admin-web and pofresh-cli.

Message types

There are two message types of the communication between processes.

• request - bidirectional message that cooperated with response.

• notify - unidirectional message.

Components

ConsoleService

Main service of pofresh-admin that runs in both master and monitor processes. It maintains the master agent or monitor agent for the process, loads the registed modules and provides the messages routing service for the messages from other processes.

MasterAgent

pofresh-admin agent that runs on the master process to provide the basic network communication and protocol encoding and decoding.

MonitorAgent

pofresh-admin agent that runs on the monitor process to provide the basic network communication and protocol encoding and decoding.

Module

Module is the place to implement the monitor logic, such as process status collecting. Developer can register modules in pofresh-admin to customize all kinds of system monitors.

There are three optional callback functions in each module.

• function masterHandler(agent, msg, cb) - callback in master process to process a message from monitor process or a timer event in master process.

• function monitorHandler(agent, msg, cb) - callback in monitor process to process a message from master process or a timer event in monitor process.

• function clientHandler(agent, msg, cb) - callback in master process to process a message from client.

The relations of the components is as below:

Usage

const admin = require("pofresh-admin");

Create a consoleService instance in master process.

const masterConsole = admin.createMasterConsole({  
    port: masterPort  
});  

Register an admin module.

masterConsole.register(moduleId, module);  

Start masterConsole.

masterConsole.start(function(err) {  
  // start servers  
});  

Create a consoleService instance in monitor process.

const monitorConsole = admin.createMonitorConsole({  
    id: serverId,  
    type: serverType,  
    host: masterInfo.host,  
    port: masterInfo.port,  
    info: serverInfo  
}); 

Customized modules

Developers can customize modules to collect and export additional status as they need.

Simple example

class Module {
  constructor(app, opts) {
    opts = opts || {};
    this.type = opts.type || 'pull';  // pull or push 
    this.interval = opts.interval || 5; // pull or push interval
  }

  monitorHandler (agent, msg) {
    var word = agent.id + ' hello pofresh';
    // notify admin messages to master
    agent.notify(Module.moduleId, {serverId: agent.id, body: word});
  }

  masterHandler (agent, msg) {
      // if no message, then notify all monitors to fetch datas
      if(!msg) {
        agent.notifyAll(Module.moduleId);
        return;
      }
      // collect data from monitor
      var data = agent.get(Module.moduleId);
      if(!data) {
        data = {};
        agent.set(Module.moduleId, data);
      }
    
      data[msg.serverId] = msg;
  }

  clientHandler (agent, msg, cb) {
    // deal with client request,directly return data cached in master
    cb(null, agent.get(Module.moduleId) || {});
  }
};

Module.moduleId = 'hellopofresh';

module.exports = Module;

Register customized modules

you must register your customized modules to pofresh to make it work.
write in app.js which is in your project's root directory

app.configure('production|development', function() {
  app.registerAdmin('hellopofresh',new hellopofresh());
});

User level control

pofresh-admin defines user level for admin client to login master server in this schema

{
    "id": "user-1",
    "username": "admin",
    "password": "admin",
    "level": 1
}

level defines the user admin level
level 1 means the user has the admin permission, this user can do anything
other level user will have limited permission
currently add, stop, kill will require level 1 permission

note: by default you should provide adminUser.json file under the config dir
adminUser.json

[{
    "id": "user-1",
    "username": "admin",
    "password": "admin",
    "level": 1
}, {
    "id": "user-2",
    "username": "monitor",
    "password": "monitor",
    "level": 2
},{
    "id": "user-3",
    "username": "test",
    "password": "test",
    "level": 2
}
]

Self-defined auth

pofresh-admin provides a simple auth function in pofresh-admin auth
developers can provide self-defined auth in pofresh by
in master server

app.set('adminAuthUser', function(msg, cb){
  if(auth success) {
    cb(user);
  } else {
    cb(null);
  }
})

Server master auth

server connect to master with authorization
pofresh-admin provides a simple auth function in pofresh-admin auth
developers can provide self-defined auth in pofresh by
in master server

app.set('adminAuthServerMaster', function(msg, cb){
  if(auth success) {
    cb('ok');
  } else {
    cb('bad');
  }
})

in monitor server

app.set('adminAuthServerMonitor', function(msg, cb){
  if(auth success) {
    cb('ok');
  } else {
    cb('bad');
  }
})

note: by default you should provide adminServer.json file under the config dir
adminServer.json

[{
    "type": "connector",
    "token": "agarxhqb98rpajloaxn34ga8xrunpagkjwlaw3ruxnpaagl29w4rxn"
}, {
    "type": "chat",
    "token": "agarxhqb98rpajloaxn34ga8xrunpagkjwlaw3ruxnpaagl29w4rxn"
},{
    "type": "gate",
    "token": "agarxhqb98rpajloaxn34ga8xrunpagkjwlaw3ruxnpaagl29w4rxn"
}
]

type is the serverType, token is a string you can genrate by yourself
when using in pofresh, you should fill all your servers with type:token

Notes

pofresh-admin provides a series of useful system modules by default. But most of them are turned off by default. Add a simple line of code in app.js as below to enable them.

app.configure('development', function() {
  // enable the system monitor modules
  app.enable('systemMonitor');
});