mirror of
https://github.com/cerc-io/watcher-ts
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296 lines
7.6 KiB
Markdown
296 lines
7.6 KiB
Markdown
# Subgraph watcher demo
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* The following core services need to be running for the demo:
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* [ipld-eth-db](https://github.com/cerc-io/ipld-eth-db)
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* Version: [v4.2.3-alpha](https://github.com/cerc-io/ipld-eth-db/releases/tag/v4.2.3-alpha)
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* [geth](https://github.com/cerc-io/go-ethereum)
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* State diffing service should use `ipld-eth-db` for database.
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* Version: [v1.10.26-statediff-4.2.2-alpha](https://github.com/cerc-io/go-ethereum/releases/tag/v1.10.26-statediff-4.2.2-alpha)
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* Endpoint: http://127.0.0.1:8545
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* [ipld-eth-server](https://github.com/cerc-io/ipld-eth-server)
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* Should use `ipld-eth-db` for database.
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* Version: [v4.2.3-alpha](https://github.com/cerc-io/ipld-eth-server/releases/tag/v4.2.3-alpha)
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* Endpoints:
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* GQL: http://127.0.0.1:8082/graphql
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* RPC: http://127.0.0.1:8081
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* In [packages/codegen](./), create a `config.yaml` file:
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```yaml
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# Config to generate demo-erc721-watcher using codegen.
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# Contracts to watch (required).
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contracts:
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# Contract name.
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- name: ERC721
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# Contract file path or an url.
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path: ../../node_modules/@openzeppelin/contracts/token/ERC721/ERC721.sol
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# Contract kind
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kind: ERC721
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# Output folder path (logs output using `stdout` if not provided).
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outputFolder: ../demo-erc721-watcher
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# Code generation mode [eth_call | storage | all | none] (default: none).
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mode: all
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# Kind of watcher [lazy | active] (default: active).
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kind: active
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# Watcher server port (default: 3008).
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port: 3009
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# Flatten the input contract file(s) [true | false] (default: true).
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flatten: true
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```
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* Run codegen to generate watcher:
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```bash
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yarn codegen --config-file ./config.yaml
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```
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The watcher should be generated in `packages/demo-erc721-watcher`
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* Create a postgres12 database for the watcher:
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```bash
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sudo su - postgres
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# If database already exists
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# dropdb demo-erc721-watcher
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createdb demo-erc721-watcher
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```
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* Create database for the job queue and enable the `pgcrypto` extension on them (https://github.com/timgit/pg-boss/blob/master/docs/usage.md#intro):
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```bash
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# If database already exists
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# dropdb demo-erc721-watcher-job-queue
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createdb demo-erc721-watcher-job-queue
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```
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```
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postgres@tesla:~$ psql -U postgres -h localhost demo-erc721-watcher-job-queue
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Password for user postgres:
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psql (12.7 (Ubuntu 12.7-1.pgdg18.04+1))
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SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, bits: 256, compression: off)
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Type "help" for help.
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demo-erc721-watcher-job-queue=# CREATE EXTENSION pgcrypto;
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CREATE EXTENSION
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demo-erc721-watcher-job-queue=# exit
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```
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## Custom hooks:
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For generating default state for `ERC721` from the indexer methods, replace the `handleEvent` hook in `demo-erc721-watcher/src/hooks.ts` file with:
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```ts
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export async function handleEvent (indexer: Indexer, eventData: ResultEvent): Promise<void> {
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assert(indexer);
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assert(eventData);
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// Perform indexing based on the type of event.
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switch (eventData.event.__typename) {
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case 'TransferEvent': {
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// Get event fields from eventData.
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const { from, to, tokenId } = eventData.event;
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// Update balance entry for the sender in database.
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if (from !== '0x0000000000000000000000000000000000000000') {
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await indexer._balances(eventData.block.hash, eventData.contract, from, true);
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}
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// Update balance entry for the receiver in database.
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if (to !== '0x0000000000000000000000000000000000000000') {
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await indexer._balances(eventData.block.hash, eventData.contract, to, true);
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}
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// Update owner for the tokenId in database.
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await indexer._owners(eventData.block.hash, eventData.contract, tokenId, true);
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break;
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}
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case 'ApprovalEvent': {
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// Get event fields from eventData.
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const { tokenId } = eventData.event;
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// Update tokenApprovals for the tokenId in database.
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await indexer._tokenApprovals(eventData.block.hash, eventData.contract, tokenId, true);
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break;
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}
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case 'ApprovalForAllEvent': {
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// Get event fields from eventData.
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const { owner, operator } = eventData.event;
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// Update operatorApprovals for the tokenId in database.
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await indexer._operatorApprovals(eventData.block.hash, eventData.contract, owner, operator, true);
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break;
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}
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}
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}
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```
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Here, the `diff` is passed as true to indexer methods to store default state.
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* In `watcher-ts` repo, follow the instructions in [Setup](../../README.md#setup) for installing and building packages.
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```bash
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# After setup
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yarn && yarn build
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```
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* In `packages/demo-erc721-watcher`, run the job-runner:
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```bash
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yarn job-runner
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```
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* Run the watcher:
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```bash
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yarn server
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```
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## Operations
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Run the following in [packages/erc721-watcher](../erc721-watcher/):
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* Get the signer account address and export to a shell variable:
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```bash
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yarn account
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```
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```bash
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export SIGNER_ADDRESS="<SIGNER_ADDRESS>"
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```
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* Connect MetaMask to `http://localhost:8545` (with chain ID `99`)
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* Add a second account to Metamask and export the account address to a shell variable for later use:
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```bash
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export RECIPIENT_ADDRESS="<RECIPIENT_ADDRESS>"
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```
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* Deploy token:
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```bash
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yarn nft:deploy
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```
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* Set the returned address to the variable `$NFT_ADDRESS`:
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```bash
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NFT_ADDRESS=<NFT_ADDRESS>
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```
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* Run the following GQL mutation in generated watcher graphql endpoint http://127.0.0.1:3009/graphql
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```graphql
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mutation {
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watchContract(
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address: "NFT_ADDRESS"
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kind: "ERC721"
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checkpoint: true
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)
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}
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```
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* Run the following GQL subscription in generated watcher graphql endpoint:
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```graphql
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subscription {
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onEvent {
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event {
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__typename
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... on TransferEvent {
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from
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to
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tokenId
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},
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... on ApprovalEvent {
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owner
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approved
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tokenId
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}
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},
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block {
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number
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hash
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}
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}
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}
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```
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* Mint token:
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```bash
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yarn nft:mint --nft $NFT_ADDRESS --to $SIGNER_ADDRESS --token-id 1
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```
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* A `Transfer` event to `$SIGNER_ADDRESS` shall be visible in the subscription at endpoint.
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* An auto-generated `diff` entry `State` should be added with `parent` cid pointing to the initial checkpoint `State`.
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* Run the `getState` query at the endpoint to get the latest `State` for `NFT_ADDRESS`:
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```graphql
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query {
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getState (
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blockHash: "EVENT_BLOCK_HASH"
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contractAddress: "NFT_ADDRESS"
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# kind: "checkpoint"
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kind: "diff"
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) {
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cid
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block {
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cid
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hash
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number
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timestamp
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parentHash
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}
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contractAddress
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data
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}
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}
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```
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* Transfer token:
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```bash
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yarn nft:transfer --nft $NFT_ADDRESS --from $SIGNER_ADDRESS --to $RECIPIENT_ADDRESS --token-id 1
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```
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* An `Approval` event for `ZERO_ADDRESS` shall be visible in the subscription at endpoint.
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* A `Transfer` event to `$RECIPIENT_ADDRESS` shall be visible in the subscription at endpoint.
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* An auto-generated `diff` entry `State` should be added with `parent` cid pointing to the previous `State`.
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* Run the `getState` query again at the endpoint with event blockHash.
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* Get the latest `blockHash`:
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```bash
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yarn block:latest
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```
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* In `packages/demo-erc721-watcher`, create a checkpoint using CLI:
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```bash
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yarn checkpoint create --address $NFT_ADDRESS
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```
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* Run the `getState` query again with the output blockHash and kind `checkpoint` at the endpoint.
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* The latest checkpoint should have the aggregate of state diffs since the last checkpoint.
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* The `State` entries can be seen in `pg-admin` in table `state`.
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