PromQL Parser in Rust w/ native Node bindings

Lorenzo Mangani

Last update: Aug 7, 2022

Related tags

Parsing rust-promql-parser-js

Overview

⚙️ promql-parser-js

PromQL parsing wasm module based on Rust crate promql-rs

Status

Experiemental, don't use it!

Install

npm install @qxip/promql-parser-js

Functions

promql_parse

Usage

const jsonic = require('jsonic'); // parse imperfect JSON we might return
const { promql_parse } = require("promql-parser-js"); // parse PromQL to JSON
const query = 'sum(rate(foo{bar="baz"}[5m])) by (x,y)';
try {
  const s = promql_parse(query);
  const parsed = JSON.stringify(jsonic(s));
  console.log(parsed);
} catch(e) { console.log(e) }

node js/index.js 'rate(foo{bar="baz"}[5m])'

{
  "name": "rate",
  "args": [
    {
      "name": "foo",
      "label_matchers": [
        {
          "op": "Equal",
          "name": "bar",
          "value": "baz"
        }
      ],
      "offset": false,
      "range": "300s"
    }
  ],
  "aggregation": false
}

Build

Rebuild wasm package release. Not needed for regular module usage.

npm install
npm run build
npm test

TODO

WASM binding + NODE module
Convert Expr to json w/o Debug print
Implement test cases
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