Monitor Your Health Factor

In this section, we're gonna make a simple monitor to check your HealthFactor.

1. With our powerful DataCompressor, we can get the CreditAccount list of our wallet. There are many data in the return, you could try to output it.

   jsx
   const dataCompressorAddress = await addressProvider.getDataCompressor();
   const dataCompressor = DataCompressor__factory.connect(dataCompressorAddress, provider);
   const myCreditAccountList = await dataCompressor.getCreditAccountList(MY_WALLET);

   jsx
   const dataCompressorAddress = await addressProvider.getDataCompressor();
   const dataCompressor = DataCompressor__factory.connect(dataCompressorAddress, provider);
   const myCreditAccountList = await dataCompressor.getCreditAccountList(MY_WALLET);

2. Since we want to build a monitor, the easy way is writting a while loop. And check the blockNumber each time, when a new block is finalized, we start doing our work.

   jsx
   let lastBlockNum: number = 0;
   while (true) {
     let currentBlockNum = await provider.getBlockNumber();
     if (currentBlockNum > lastBlockNum) {
       lastBlockNum = currentBlockNum;
       ... 
     }
     await sleep(5000);
   }

   jsx
   let lastBlockNum: number = 0;
   while (true) {
     let currentBlockNum = await provider.getBlockNumber();
     if (currentBlockNum > lastBlockNum) {
       lastBlockNum = currentBlockNum;
       ... 
     }
     await sleep(5000);
   }

3. For each CreditAccount we opened, get the CreditFilter from CreditManager(Note here that CreditFilter and CreditManager are one-to-one correspondence.). Then we can use calcCreditAccountHealthFactor function from CreditFilter to get the HealthFactor directly. (You can add some alert here.)

   jsx
     if (currentBlockNum > lastBlockNum) {
       lastBlockNum = currentBlockNum;
       for (let i = 0; i < myCreditAccountList.length; ++i) {
         const creditManager = CreditManager__factory.connect(myCreditAccountList[i].creditManager, provider);
         const creditFilterAddress = await creditManager.creditFilter();
         const creditFilter = CreditFilter__factory.connect(creditFilterAddress, provider);
         const healhFactor = await creditFilter.calcCreditAccountHealthFactor(myCreditAccountList[i].addr);
         console.log(`BlockNumber ${currentBlockNum}, CreditAccount ${myCreditAccountList[i].addr}'s healh factor is ${healhFactor}`);
       }
     }

   jsx
     if (currentBlockNum > lastBlockNum) {
       lastBlockNum = currentBlockNum;
       for (let i = 0; i < myCreditAccountList.length; ++i) {
         const creditManager = CreditManager__factory.connect(myCreditAccountList[i].creditManager, provider);
         const creditFilterAddress = await creditManager.creditFilter();
         const creditFilter = CreditFilter__factory.connect(creditFilterAddress, provider);
         const healhFactor = await creditFilter.calcCreditAccountHealthFactor(myCreditAccountList[i].addr);
         console.log(`BlockNumber ${currentBlockNum}, CreditAccount ${myCreditAccountList[i].addr}'s healh factor is ${healhFactor}`);
       }
     }

   NOTE: In step 1, if you output the return data from DataCompressor, you will see the HealthFactor is also there. Why don't we query getCreditAccountList each time to get the HealthFactor of all our CreditAccount? The answer is that this query is inefficient, it will query many other data at the same. Further, we could actually save the CreditFilter list first, so that we don't need to query the Creditfilter every time.