mirror of https://github.com/cerc-io/watcher-ts synced 2026-02-18 21:54:06 +00:00

History

nikugogoi 43d64f9e4b Invoke subgraph handler in watcher event processing (#34 ) * Invoke subgraph handler in watcher event processing * Fix error when invoking subgraph handler * Parse events using event signature specified in subgraph yaml * Use contract abi to parse event params * Invoke event handler based on event signature * Fill event with block and transaction data * Comment missing fields in block and transaction data		2021-12-28 16:08:05 +05:30
..
environments	Invoke subgraph handler in watcher event processing (#34 )	2021-12-28 16:08:05 +05:30
src	Invoke subgraph handler in watcher event processing (#34 )	2021-12-28 16:08:05 +05:30
.eslintignore	Integrate generated watcher to invoke handlers in graph-node (#33 )	2021-12-28 16:08:05 +05:30
.eslintrc.json	Integrate generated watcher to invoke handlers in graph-node (#33 )	2021-12-28 16:08:05 +05:30
.gitignore	Integrate generated watcher to invoke handlers in graph-node (#33 )	2021-12-28 16:08:05 +05:30
package.json	Integrate generated watcher to invoke handlers in graph-node (#33 )	2021-12-28 16:08:05 +05:30
README.md	Integrate generated watcher to invoke handlers in graph-node (#33 )	2021-12-28 16:08:05 +05:30
tsconfig.json	Integrate generated watcher to invoke handlers in graph-node (#33 )	2021-12-28 16:08:05 +05:30

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>