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libs/pubsub/query: add EXISTS operator (#4077)

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## Issue:

This PR adds an "EXISTS" condition to the event query grammar. It enables querying for the occurrence of an event without having to provide a condition for one of its attributes.

As an example, someone interested in all slashing events might currently catch them with a query such as slash.power > 0.

With this PR the event can be captured with slash.power EXISTS or just slash EXISTS to catch by event type.

## Examples:

`slash EXISTS`

## Commits:

* Add EXISTS condition to query grammar

* Gofmt files

* Move PEG instructions out of auto-generated file to prevent overwrite

* Update libs/pubsub/query/query.go

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

* Update changelog and add test case

* Merge with other changes in PR #4070

* Add EXISTS to Conditions() func

* Apply gofmt

* Addressing PR comments
This commit is contained in:
Henrik Aasted Sørensen
2019-11-07 08:30:50 +01:00
committed by Anton Kaliaev
parent 3495a915cc
commit 98c595312a
8 changed files with 947 additions and 547 deletions
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4
libs/pubsub/query/peg.go Normal file
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// nolint
package query
//go:generate peg -inline -switch query.peg