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stack-orchestrator/stack_orchestrator/data/stacks/fixturenet-payments/ponder-demo.md

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Demo

Stack components:

  • ipld-eth-db database for statediffed data
  • Local geth + lighthouse blockchain "fixturenet" running in statediffing mode
  • ipld-eth-server-2 which runs an ETH RPC API and a GQL server; they both serve data from ipld-eth-db
  • A go-nitro deployment acting as the remote Nitro node for ipld-eth-server-2
  • Example ERC20 Ponder apps
    • ponder-app-indexer-1 that pays the ipld-eth-server-2 for ETH RPC requests
    • ponder-app-indexer-2 that pays ponder-app-indexer-1 for GQL queries
    • ponder-app-watcher that pays ponder-app-indexer-2 for GQL queries

Setup

  • In a terminal, check ipld-eth-server-2's logs to keep track of incoming RPC requests from the ponder-app-indexer-1:

    docker logs -f $(docker ps -aq --filter name="ipld-eth-server-2")

Run

ERC20 Ponder App

  • Run the first indexer Ponder app:

    docker exec -it payments-ponder-app-indexer-1-1 bash -c "DEBUG=laconic:payments pnpm start"

# Expected output:
# 12:57:03.751 INFO  payment    Nitro node setup with address 0x67D5b55604d1aF90074FcB69b8C51838FFF84f8d
#   laconic:payments Starting voucher subscription... +0ms
# ...
# 09:58:54.288 INFO  payment    Creating ledger channel with nitro node 0x660a4bEF3fbC863Fcd8D3CDB39242aE513d7D92e ...
# 09:59:14.230 INFO  payment    Creating payment channel with nitro node 0x660a4bEF3fbC863Fcd8D3CDB39242aE513d7D92e ...
# 09:59:14.329 INFO  payment    Using payment channel 0x1ff59db391b7a55bed723b930ab53c80e7ce857487c1e58771aa5a0737d71625

  • Export the payment channel id to a variable:

    export PONDER_UPSTREAM_PAYMENT_CHANNEL=<PAYMENT_CHANNEL_ID>

  • On starting the Ponder app in indexer mode, it creates a payment channel with the ipld-eth-server-2's (external) Nitro node and then starts the historical sync service

  • The sync service makes several ETH RPC requests to the ipld-eth-server-2 to fetch required data; check the ipld-eth-server-2 logs for charged RPC requests (eth_getBlockByNumber, eth_getLogs):

    # Expected output:
# ...
# 2023/10/18 05:29:38 INFO Serving a paid RPC request method=eth_getBlockByNumber cost=50 sender=0x67D5b55604d1aF90074FcB69b8C51838FFF84f8d
# time="2023-10-18T05:29:38Z" level=debug msg=START api_method=eth_getBlockByNumber api_params="[latest true]" api_reqid=0 conn="172.26.0.19:42306" user_id= uuid=54992dc3-6d77-11ee-9ede-0242ac1a000f
# WARN [10-18|05:29:38.292] Attempting GerRPCCalls, but default PluginLoader has not been initialized
# time="2023-10-18T05:29:38Z" level=debug msg=END api_method=eth_getBlockByNumber api_params="[latest true]" api_reqid=0 conn="172.26.0.19:42306" duration=22 user_id= uuid=54992dc3-6d77-11ee-9ede-0242ac1a000f
# ...
# 2023/10/18 05:29:40 INFO Serving a paid RPC request method=eth_getLogs cost=50 sender=0x67D5b55604d1aF90074FcB69b8C51838FFF84f8d
# WARN [10-18|05:29:40.340] Attempting GerRPCCalls, but default PluginLoader has not been initialized
# time="2023-10-18T05:29:40Z" level=debug msg="retrieving log cids for receipt ids"
# ...

  • Check the Ponder - ipld-eth-server-2 payment channel status:

    docker exec payments-nitro-rpc-client-1 npm exec -c "nitro-rpc-client get-payment-channel $PONDER_UPSTREAM_PAYMENT_CHANNEL -s false -h go-nitro -p 4006"

# Expected output ('PaidSoFar' is non zero):
# {
#   ID: '0x1ff59db391b7a55bed723b930ab53c80e7ce857487c1e58771aa5a0737d71625',
#   Status: 'Open',
#   Balance: {
#     AssetAddress: '0x0000000000000000000000000000000000000000',
#     Payee: '0x660a4bef3fbc863fcd8d3cdb39242ae513d7d92e',
#     Payer: '0x67d5b55604d1af90074fcb69b8c51838fff84f8d',
#     PaidSoFar: 7200n,
#     RemainingFunds: 999992800n
#   }
# }

  • In another terminal run the second indexer Ponder app:

    docker exec -it payments-ponder-app-indexer-2-1 bash -c "DEBUG=laconic:payments pnpm start"

# Expected output:
# 08:00:28.701 INFO  payment    Nitro node setup with address 0xB2B22ec3889d11f2ddb1A1Db11e80D20EF367c01
#   laconic:payments Starting voucher subscription... +0ms
# ...
# 09:58:54.288 INFO  payment    Creating ledger channel with nitro node 0x67D5b55604d1aF90074FcB69b8C51838FFF84f8d ...
# 09:59:14.230 INFO  payment    Creating payment channel with nitro node 0x67D5b55604d1aF90074FcB69b8C51838FFF84f8d ...
# 09:59:14.329 INFO  payment    Using payment channel 0xfbf9d7eb7c18446883c7f57f4c94db5607f414a224b3e921c787db07371d2a70

  • On starting indexer Ponder app, it creates a payment channel with first indexer and then starts the sync services

  • Check logs in ponder-indexer-1 to see payments made from ponder-indexer-2 from GQL queries to fetch network data

    # ...
#   laconic:payments Received a payment voucher of 100 from 0xB2B22ec3889d11f2ddb1A1Db11e80D20EF367c01 +23ms
#   laconic:payments Serving a paid query for 0xB2B22ec3889d11f2ddb1A1Db11e80D20EF367c01 +0ms
# 13:01:05.671 DEBUG payment    Verified payment for GQL queries getEthLogs
#   laconic:payments Received a payment voucher of 100 from 0xB2B22ec3889d11f2ddb1A1Db11e80D20EF367c01 +20ms
#   laconic:payments Serving a paid query for 0xB2B22ec3889d11f2ddb1A1Db11e80D20EF367c01 +0ms
# 13:01:05.691 DEBUG payment    Verified payment for GQL queries getEthBlock
# 13:01:07.598 INFO  realtime   Fetched missing blocks [686, 687] (network=fixturenet)
# 13:01:07.598 DEBUG realtime   Started processing new head block 686 (network=fixturenet)
# ...

  • Following are the example GQL queries (with payment headers) ponder-indexer-2 makes to ponder-indexer-1 for fetching data

    {
  getEthLogs(
    chainId: 1212,
    address: "0x6325439389e0797ab35752b4f43a14c004f22a9c",
    fromBlock: 100,
    toBlock: 200,
  ) {
    address
    blockHash
    blockNumber
    data
    logIndex
    removed
    topics
    transactionHash
    transactionIndex 
  }

  getEthBlock(
    chainId: 1212,
    blockNumber: 150,
    fullTransactions: false
  ) {
    baseFeePerGas
    difficulty
    extraData
    gasLimit
    gasUsed
    hash
    logsBloom
    miner
    mixHash
    nonce
    number
    parentHash
    receiptsRoot
    sha3Uncles
    size
    stateRoot
    timestamp
    totalDifficulty
    transactionsRoot
    txHashes
  }
}

  • In another terminal run the Ponder app in watcher mode:

    docker exec -it payments-ponder-app-watcher-1 bash -c "DEBUG=laconic:payments pnpm start"

# Expected output:
# 11:23:22.057 DEBUG app        Started using config file: ponder.config.ts
# 08:02:12.548 INFO  payment    Nitro node setup with address 0x111A00868581f73AB42FEEF67D235Ca09ca1E8db
#   laconic:payments Starting voucher subscription... +0ms
# 08:02:17.417 INFO  payment    Creating ledger channel with nitro node 0xB2B22ec3889d11f2ddb1A1Db11e80D20EF367c01 ...
# 08:02:37.135 INFO  payment    Creating payment channel with nitro node 0xB2B22ec3889d11f2ddb1A1Db11e80D20EF367c01 ...
# 08:02:37.313 INFO  payment    Using payment channel 0xc48622577dfa389283beb19ed946274eb034587d72e61445dc997304be671f1a
# ...
# 11:23:22.436 INFO  server     Started responding as healthy

  • Check the terminal of the second indexer Ponder app. Logs of payment for getLogEvents queries can be seen:

    # ...
# 08:02:37.763 DEBUG realtime   Finished processing new head block 89 (network=fixturenet)
#   laconic:payments Received a payment voucher of 50 from 0x111A00868581f73AB42FEEF67D235Ca09ca1E8db +444ms
#   laconic:payments Serving a paid query for 0x111A00868581f73AB42FEEF67D235Ca09ca1E8db +1ms
# 08:02:37.804 DEBUG payment    Verified payment for GQL queries getLogEvents
#   laconic:payments Received a payment voucher of 50 from 0x111A00868581f73AB42FEEF67D235Ca09ca1E8db +45ms
#   laconic:payments Serving a paid query for 0x111A00868581f73AB42FEEF67D235Ca09ca1E8db +0ms
# 08:02:37.849 DEBUG payment    Verified payment for GQL queries getLogEvents

  • Following are the example GQL queries (with payment headers) ponder-watcher makes to ponder-indexer-2 for fetching data

    getLogEvents(
  fromTimestamp: 1695303079,
  toTimestamp: 1695304156,
  filters: [
    {
      name: "AdventureGold"
      chainId: 1212,
      address: ["0x6325439389e0797ab35752b4f43a14c004f22a9c"],
      fromBlock: 100,
      toBlock: 200,
      includeEventSelectors: ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
    }
  ]
) {
  events {
    transaction {
      hash
    }
    log {
      id 
    }
    block {
      number
    }
  }
  metadata {
    pageEndsAtTimestamp	
    isLastPage
  }
}

  • Open watcher Ponder app endpoint http://localhost:42069

    • Try GQL query to see transfer events

      {
  transferEvents (orderBy: "timestamp", orderDirection: "desc") {
    id
    amount
    from {
      id
    }
    to {
      id
    }
    timestamp
  }
}

  • Transfer an ERC20 token on chain

    • Get the deployed ERC20 token address

      export TOKEN_ADDRESS=$(docker exec payments-ponder-er20-contracts-1 jq -r '.address' ./deployment/erc20-address.json)

    • Transfer token

      docker exec -it payments-ponder-er20-contracts-1 bash -c "yarn token:transfer:docker --token ${TOKEN_ADDRESS} --to 0xe22AD83A0dE117bA0d03d5E94Eb4E0d80a69C62a --amount 5000"

  • Wait for a log in watcher Ponder app

    06:40:47.567 INFO  handlers   Processed 1 event (up to Oct 19, 2023)

  • Check the GQL query again in http://localhost:42069 to see a new TransferEvent entity