Monitor WETH balance on Solana (via Native program)

In the wormhole example, one can also monitor SPL token program.

First, import your builtin SPL token processor

import { SPLTokenProcessor } from '@sentio/sdk/solana/builtin'

Then we trigger user written callback on both Mint and Burn instructions (Both are standard in SPL program). The code is as follows

SPLTokenProcessor.bind({
  address: 'wormDTUJ6AWPNvk59vGQbDvGJmqbDTdgWgAqcLBCgUb',
})
  .onMintTo((data, ctx) => {
    if (data.mint === '7vfCXTUXx5WJV5JADk17DUJ4ksgau7utNKj4b963voxs') {
      ctx.meter.Counter('totalWeth_supply').add(data.amount as number)
    }
  })
  .onBurn((data, ctx) => {
    if (data.mint === '7vfCXTUXx5WJV5JADk17DUJ4ksgau7utNKj4b963voxs') {
      ctx.meter.Counter('totalWeth_supply').sub(data.amount as number)
    }
  })
  .innerInstruction(true)

You could see the metrics are submitted using ctx.meter.Counter

ℹ️

See this repo for full implementation. To learn how to view metrics from the UI, go to view-metrics