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prathamesh0 16bb955213 Invoke subgraph block handlers (#43 ) * Add a test case to eden test to call the block handler * Add a block handler in example subgraph and call it in a watcher * Use an array map to call all the block handlers for a contract * Await on all the promises returned by block handlers map		2021-12-28 16:08:05 +05:30
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README.md

Example Watcher

Setup

Run the following command to install required packages:
```
yarn
```

Create a postgres12 database for the watcher:

sudo su - postgres
createdb graph-test-watcher

If the watcher is an active watcher:

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):

createdb graph-test-watcher-job-queue

postgres@tesla:~$ psql -U postgres -h localhost graph-test-watcher-job-queue
Password for user postgres:
psql (12.7 (Ubuntu 12.7-1.pgdg18.04+1))
SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, bits: 256, compression: off)
Type "help" for help.

graph-test-watcher-job-queue=# CREATE EXTENSION pgcrypto;
CREATE EXTENSION
graph-test-watcher-job-queue=# exit

Update the config with database connection settings.
Update the upstream config in the config file and provide the ipld-eth-server GQL API and the indexer-db postgraphile endpoints.

Customize

Indexing on an event:
- Edit the custom hook function handleEvent (triggered on an event) in hooks.ts to perform corresponding indexing using the Indexer object.
- Refer to hooks.example.ts for an example hook function for events in an ERC20 contract.

Run

Run the watcher:
```
yarn server
```

GQL console: http://localhost:3008/graphql

If the watcher is an active watcher:

Run the job-runner:
```
yarn job-runner
```

To watch a contract:

yarn watch:contract --address <contract-address> --kind Example --starting-block [block-number]

To fill a block range:

yarn fill --startBlock <from-block> --endBlock <to-block>