Paraemu P2P Pack

For user

How to use

1. Install global package paraemu

   npm i -g paraemu

2. Setting config file:

   File structure:

   {
       "server": undefined | {                     // server config
           "host": @string,
           "port": @int
       },
       "remote": undefined | {                     // client config
           "host": @string,
           "port": @int
       },
       "processes" : [
           {
               "tag": undefined | @string,
               "root": undefined | @string,        // root path
               "script": @string,                  // execute file name
               "args": undefined | [ @any, ... ],  // node js command line arguments
               "env": undefined | [ @string, ... ] // node js command line options
           },
           ...
       ]
   }

   • Script execute path is ./${root}/${script}.

   Central Example:

   // ./test/config-central.json
   {
       "server": {
           "host": "127.0.0.1",
           "port": 23410
       },
       "processes" : [
           {
               "root": "./content/central/",
               "script": "./central.js"
           }
       ]
   }

   Node Example:

   // ./test/config-single-node.json
   {
       "remote": {
           "host": "127.0.0.1",
           "port": 23410
       },
       "processes" : [
           {
               "root": "./content/single-node",
               "script": "./node.js"
           }
       ]
   }

3. Write script file:

   (1) Central Example:

   // ./test/content/central/central.js
   const pemu = require('paraemu');
    
   /**
    * Node connect logic
    * @async
    * @param {string} nodeId 
    * @return {Promise<string[]>} Neighbor node ids
    */
   pemu.nodeConnect = async (nodeId) => {
       ...
       return neighborNodeIds;
   };
    
   /**
    * Node disconnect logic
    * @async
    * @param {string} nodeId 
    * @return {Promise<undefined>} 
    */
   pemu.nodeDisconnect = async (nodeId) => {
       ...
   };
    
   /**
    * Node group detach logic
    * @async
    * @param {string} groupId 
    * @return {Promise<string[]>} Node ids
    */
   pemu.nodeGroupDetach = async (groupId) => {
       ...
       return nodeIds;
   };
    
   /**
    * Fetch neighbors logic
    * @async
    * @param {string} nodeId 
    * @return {Promise<string[]>} Neighbor node ids
    */
   pemu.fetchNeighbors = async (nodeId) => {
       ...
       return nodeIds;
   };
    
   // expand p2p pack
   require('paraemu-p2p-pack').expand(pemu, 'central');
    
   /**
    * Do something before init function call promise resolve
    */
   let function1 = () => {
       ...
   };
   await pemu.initP2PEnv(function1);         // init central

   (2) Node Example:

   // ./test/content/single-node/node.js
   const pemu = require('paraemu');
    
   /**
    * Node agree or disagree to become a peer (Optional)
    * @param {string} nodeId node id for asker
    * @return {boolean} true: agree, false: disagree
    */
   pemu.canAddPeer = (nodeId) => {
       ...
   };
    
   // expand p2p pack
   require('paraemu-p2p-pack').expand(pemu, 'node');
    
   // set maximum peers (after require p2p-pack)
   pemu.maxPeers = 5;
    
   /**
    * Do something before init function call promise resolve
    */
   let function2 = () => {
       ...
   };
   await pemu.initP2PEnv(function2);   // init node
    
   // paraemu p2p default event
   pemu.on('__p2p-update-neighbors', callback);    // old node can update wired neighbors
    
   // paraemu p2p method
   await pemu.fetchNeighbors();        // fetch the newest wired neighbors and save those to cache
   await pemu.findPeer();              // find peers by wired neighbors in cache and save those to cache
   await pemu.disconnect();            // disconnect
    
   // paraemu p2p property
   console.log(pemu.wiredNeighbors);   // list of wired neighbors in cache
   console.log(pemu.peers);            // list of peers in cache

4. Run command line:

   paraemu ./config.json

5. Debug task use Chrome DevTools (Optional):
   (1) Add "--inspect-brk" in "env" field in config.json
   (2) Run commend line which is similar to step 3
   (3) Url set "chrome://inspect" in Chrome
   (4) Click "Open dedicated DevTools for Node" link
   (5) Click "Add connection" button
   (6) Add "localhost:9230" in url field
   (Debugger listening start from 9230 port in first child process)
   (7) Press "F5" key to refresh page
   (8) Click "inspect" link in Remote Target

6. Debug main task use Chrome DevTools (Optional):
   (1) Run command line which is different from step 3:

   paraemu --inspect-brk ./config

   (2) Url set "chrome://inspect" in Chrome
   (3) Click"Open dedicated DevTools for Node" link
   (4) Click "Add connection" button
   (5) Add "localhost:9229" in url field
   (Debugger listening start from 9229 port in main process)
   (6) Press "F5" key to refresh page
   (7) Click "inspect" link in Remote Target

Noun Definition

• Group: Total workspace in config.
• Task: Each child process in config.
• Job: Detailed work in each child process.

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For maintainer

Install project

• Clone project:

  git clone <project-url>

• Install dependency package:

  npm install

Build and Run

• Run test-all (use npm):

  npm run test-all

• Run test-central (use npm):

  npm run test-central

• Run test-multi-node (use npm):

  npm run test-multi-node

• Run test-single-node (use npm):

  npm run test-single-node