luatnd / pcs-bot-be

Auto quick buy and quick sell for the newly listed pair (500 milliseconds time manner)

nft block scan service

Scan all nft from EVM-compatible blockchain node

Output: TODO: fill here

Installation

$ yarn install

Prepare kafka auth file, put it here:

secrets/kafka.keystore.jks

Create and edit the .env file:

cp .env.example .env

Develoment

# development
$ yarn start

# watch mode
$ yarn start:dev

# production mode
$ yarn start:prod

Test

# unit tests
$ yarn test

# e2e tests
$ yarn test:e2e

# test coverage
$ yarn test:cov

Operation

This is how you operate this service:

O1. Deploy new scan instance (new process)

TODO

O2. Do Scan

Open graphql interface and run the mutation:

scanBlockRange(
    from_block: Float!
    to_block: Float!
    chain: String!
    block_per_step: Float!
): Boolean

O3. Scan with multiple threads

Let's say you wanna scan block 100-1000 and 3000-4000 parallel.

Approach to run scan in multiple threads.

• Run 2 mutation:

  - scanBlockRange(100, 1000, "ETH", 50)
  - scanBlockRange(3000, 4000, "ETH", 50)

This will start 2 threads in a same process

• Start 2 node process with different port on a single machine or multiple vps:
  • pm2 start nft-blockscan-1 > Run the mutation against this process
  • pm2 start nft-blockscan-2 > Run the mutation against this process

04. Scan block in the future

Open the graphql interface and run the mutation:

scanFromBlock(
  chain: String
  from_block: Float!
): Boolean

• This will scan from from_block to future
• If you don't fill in from_block field, this will scan from the (lastest block - 10) to the future

05. Rescan blocks failed

Open the graphql interface and run the query:

query {
  getBlocksFailed{
    blockRange,
    singleBlock
  }
}

• This will return a list of blocks failed and reason.
• Then you can use the scanBlockRange api to rescan these blocks.