Hasura Parser

An easy utility library for parsing data from Hasura events and actions.

Getting started

First install the package.

yarn add @snotra/hasura-parser
npm install @snotra/hasura-parser

Actions

To use the Action Parser you can either import ActionParser or require the whole package.

import { ActionParser } from '@snotra/hasura-parser'

// Data is from your request body
const actionParser = new ActionParser( data )

Parsing data

To get the data you need, just pass in the keys of the arguments you want:

const data = actionParser.getData( "id", "type", "user" )

This will give you the following response:

{
	"id": <data>,
	"type": <data>,
	"user": null
}

If the value is not found a null will be returned in its place.

If you want to get all the data in its raw form, you can issue the following call:

const data = actionParser.getRawData()

This will give you all the values that were passed in by Hasura.

Getting session variables

Single session variable:

const userId = actionParser.getSessionVariable( "x-hasura-user-id" )

This will either give you the value of the session variable or just null if it is not set.

All session variables:

const sessionVariables = actionParser.getSessionVariables()

Other data

Action name:

const sessionVariables = actionParser.getActionName()

Events

To use the Events Parser you can either import EventParser or require the whole package.

import { EventParser } from '@snotra/hasura-parser'

// Data is from your request body
const eventParser = new EventParser( data )

Parsing data

To get the data you need, just pass in the keys of the arguments you want:

const data = eventParser.getData( "id", "type", "user" )

The response depends on the event type, if it is an INSERT, DELETE or MANUAL operation you will receive the following response:

{
	"id": <data>,
	"type": <data>,
	"user": null
}

If the value is not found a null will be returned in its place.

If it is an UPDATE operation, the object will contain the old and new values:

{
	"old": {
		"id": <data>,
		"type": <data>,
		"user": null
	},
	"new": {
		"id": <data>,
		"type": <data>,
		"user": null	
	}
}

If you want to get all the data in its raw form, you can issue the following calls:

const oldData = eventParser.getOldData()
const newData = eventParser.getNewData()

Depending on the event type, old or new can be null.

This will give you all the values that were passed in by Hasura.

Getting session variables

Single session variable:

const userId = eventParser.getSessionVariable( "x-hasura-user-id" )

This will either give you the value of the session variable or just null if it is not set.

All session variables:

const sessionVariables = eventParser.getSessionVariables()

Other data

Get ID of event:

const eventID = eventParser.getID()

Get trigger name (set in Hasura Console):

const triggerName = eventParser.getTriggerName()

Get schema name (the name of the schema that was affected by the event):

const schemaName = eventParser.getSchemaName()

Get table name (name of affected table by the event):

const tableName = eventParser.getTableName()

Get current retries and max retries (if this is set in the event in Hasura):

const currentRetry = eventParser.getCurrentRetry()
const maxRetries = eventParser.getMaxRetries()

Operation type checking (INSERT, UPDATE, DELETE, MANUAL):

const isInsert = eventParser.isInsertOperation() // The following operations return a boolean value
const isUpdate = eventParser.isUpdateOperation()
const isDelete = eventParser.isDeleteOperation()
const isManual = eventParser.isManualOperation()
const operationType = eventParser.getOperationType() // Returns INSERT, UPDATE, DELETE or MANUAL

Timestamp of operation:

const timestamp = eventParser.getTimestamp()

Trace context:

const traceContextID = eventParser.getTraceContextID()
const traceContextSpanID = eventParser.getTraceContextSpanID()

Contributions

If you would like to make any contribution you are welcome to do so.