2023-10-19 06:56:10 +00:00
# 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` :
```bash
docker logs -f $(docker ps -aq --filter name="ipld-eth-server-2")
```
## Run
### ERC20 Ponder App
* Run the first indexer Ponder app:
```bash
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:
```bash
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` ):
```bash
# 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:
```bash
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:
```bash
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
```bash
# ...
# 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)
# ...
```
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* Following are the example GQL queries (with payment headers) `ponder-indexer-2` makes to `ponder-indexer-1` for fetching data
```graphql
{
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
}
}
```
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* In another terminal run the Ponder app in watcher mode:
```bash
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:
```bash
# ...
# 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
```
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* Following are the example GQL queries (with payment headers) `ponder-watcher` makes to `ponder-indexer-2` for fetching data
```graphql
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
}
}
```
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* Open watcher Ponder app endpoint http://localhost:42069
* Try GQL query to see transfer events
```graphql
{
transferEvents (orderBy: "timestamp", orderDirection: "desc") {
id
amount
from {
id
}
to {
id
}
timestamp
}
}
```
* Transfer an ERC20 token on chain
* Get the deployed ERC20 token address
```bash
export TOKEN_ADDRESS=$(docker exec payments-ponder-er20-contracts-1 jq -r '.address' ./deployment/erc20-address.json)
```
* Transfer token
```bash
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
```bash
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
