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Oct 6th, 2020
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  1. "use strict"
  2.  
  3. const { Wallets, Gateway } = require("fabric-network")
  4. const fs = require("fs")
  5. const path = require("path")
  6. const net = require("net")
  7.  
  8. const blockProcessing = require("./blockProcessing.js")
  9.  
  10. const config = require("./config.json")
  11. const channelid = config.channelid
  12. const sdkUser = config.sdk_user
  13. const sdkAddress = config.sdk_address
  14. const sdkPort = config.sdk_port
  15. const healthPort = config.healthcheck_port
  16.  
  17. const configPath = path.resolve(__dirname, "nextblock.txt")
  18.  
  19. class BlockMap {
  20.     constructor() {
  21.         this.list = []
  22.     }
  23.     get(key) {
  24.         key = parseInt(key, 10).toString()
  25.         return this.list[`block${key}`]
  26.     }
  27.     set(key, value) {
  28.         this.list[`block${key}`] = value
  29.     }
  30.     remove(key) {
  31.         key = parseInt(key, 10).toString()
  32.         delete this.list[`block${key}`]
  33.     }
  34. }
  35.  
  36. let ProcessingMap = new BlockMap()
  37.  
  38. async function main() {
  39.     try {
  40.         const http = require('http');
  41.         /*const server = http.createServer((req, res)=>{
  42.             console.log(req.url, req.method, req. headers);
  43.             res.write('<html>');
  44.             res.write('<head><title>HLF Event Listener </title></head>');
  45.             res.write(' <body>HLF Event Listener Service is Up!</body>');
  46.             res.write('</html>');
  47.             res.end();
  48.         });
  49.         server.listen(healthPort);*/
  50.  
  51.         let nextBlock = 1
  52.         if (fs.existsSync(configPath)) {
  53.             nextBlock = fs.readFileSync(configPath, "utf8")
  54.         } else {
  55.             fs.writeFileSync(configPath, parseInt(nextBlock, 10))
  56.         }
  57.  
  58.         const walletPath = path.join(process.cwd(), "wallet")
  59.         const wallet = await Wallets.newFileSystemWallet(walletPath)
  60.         console.log(`Wallet path: ${walletPath}`)
  61.  
  62.         const userExists = await wallet.get(sdkUser)
  63.         if (!userExists) {
  64.             console.log(`An identity for the user "${sdkUser}" does not exist in the wallet`)
  65.             console.log("Run the enrollUser.js application before retrying")
  66.             return
  67.         }
  68.  
  69.         const ccpPath = path.resolve("connection-mtr.json")
  70.         const ccp = JSON.parse(fs.readFileSync(ccpPath, "utf8"))
  71.         const gateway = new Gateway()
  72.         await gateway.connect(ccp, { wallet, identity: sdkUser, discovery: { enabled: true, asLocalhost: false } })
  73.  
  74.         let network, listener
  75.         for (var i=0; i<channelid.length; i++) {
  76.             let cid = channelid[i]
  77.             console.log(`Adding listener for channel ${cid}`)
  78.             network = await gateway.getNetwork(cid)
  79.             console.log(`await gateway.getNetwork`)
  80.             listener = await network.addBlockListener(
  81.                 async (event) => {
  82.                     await ProcessingMap.set(event.blockData.header.number, event.blockData)
  83.                     console.log(`Added block ${event.blockData.header.number} to ProcessingMap`)
  84.                 },
  85.                 { startBlock: parseInt(nextBlock, 10) }
  86.             )
  87.             console.log(`await network.addBlockListener`)
  88.         };
  89.  
  90.         console.log(`Listening for block events, nextblock: ${nextBlock}`)
  91.         processPendingBlocks(ProcessingMap, channelid)
  92.     } catch (error) {
  93.         console.error(`Failed to evaluate transaction: ${error}`)
  94.         process.exit(1)
  95.     }
  96. }
  97.  
  98. async function processPendingBlocks(ProcessingMap, channelid) {
  99.     setTimeout(async () => {
  100.         let nextBlockNumber = fs.readFileSync(configPath, "utf8")
  101.         let processBlock
  102.  
  103.         do {
  104.             processBlock = ProcessingMap.get(nextBlockNumber)
  105.             if (processBlock == undefined) {
  106.                 break
  107.             }
  108.  
  109.             try {
  110.                 await blockProcessing.processBlockEvent(channelid, processBlock, sdkAddress, sdkPort)
  111.             } catch (error) {
  112.                 console.error(`Failed to process block: ${error}`)
  113.             }
  114.  
  115.             ProcessingMap.remove(nextBlockNumber)
  116.             fs.writeFileSync(configPath, parseInt(nextBlockNumber, 10) + 1)
  117.             nextBlockNumber = fs.readFileSync(configPath, "utf8")
  118.         } while (true)
  119.  
  120.         processPendingBlocks(ProcessingMap)
  121.     }, 250)
  122. }
  123.  
  124. main()
  125.  
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