thng-query

DSL for working with EVRYTHNG Platform API

tq --key $OPERATOR_KEY 'products tagged embedded where photos~gif'

const tq = require('tq');

tq.setup({
  authorization: process.env.OPERATOR_KEY
});

tq.run('thngs with name Advanced* where identifiers.ser^673')
    .then(console.log)
    .catch(console.error);

Query syntax

Each query consist of stages:

|     fetch stage        |     filter stage         |
'thngs with name Advanced* where identifiers.ser^673'

Each stage is independent from the other in terms of data processing. Think about it as about stream. That also means independent syntax for each one of them.

Stages

Fetch

'target selector'
'quantifier target selector'

quantifier

• int string (14, 203, 1) target:
• thng(s)
• product(s) selector:
• with name | named
• with tag | tagged

Filter

'where filterExpression'

filterExpression

• filterField filterOperator filterValue filterField
• string path to a property of entity filterOperator
• = - exact match
• ~ - inclusion check
• ^ - starts with
• $ - ends with filterValue
• string

Interface

As library

const tq = require('tq');

/**
 * Runs a given query. Throws if any errors during parsing
 * @param {String} query 
 */
tq.run('query');

/**
 * Consumes global settings for tq
 * @param {Settings} settings   
 */
tq.setup({})

As CLI app

# To see all available options
tq --help 
# Will dump output json straight to stdout
tq -k $OPERATOR_KEY 'thngs where properties.online = true'
# Could be used with formatters, like jq
tq -k $OPERATOR_KEY 'products with tag overcomplicated' | jq .

Settings

tq.setup({
  /**
   * Defines if tq will produce 
   * debug output
   * 
   * @type {Boolean}
   */
  debug: false,
  
  /**
   * Defines max depth of query pipeline i.e. max amount of 
   * pipeline repetitions attempted to fulfill output.
   * Imagine, account has 10k thngs, tagged "connected"
   * running a query with settings.perPage=1 against them would attempt
   * to fulfill settings.maxItems (100 by default) which would be actually 
   * capped at 20 by default.
   * 
   * @type {Number}
   */
  depth: 20,
  
  /**
   * Defines how many entities will be queries by fetch stage
   * Ends up as a "perPage" query param on all outgoing requests
   * 
   * @type {Number}
   */
  perPage: 100,
  
  /**
   * Defines how many results at max pipeline will expect
   * 
   * @type {Number}
   */
  maxResults: 100,
  
  /**
   * API Key to use for queries
   * 
   * @see https://developers.evrythng.com/docs/api-key-scopes-and-permissions
   * @type {String} 
   */
  authorization: '',
  
  /**
   * API Url to use
   * 
   * @type {String}
   */
  apiUrl: 'https://api.evrythng.com',
});

Development

# Will complile current grammar and run nearley-test 
# against given expression
npm run debug -- 'thngs where createdAt $ 65'

# Will complile nearley grammar to parser
npm run compile

# Will produce a random string which will be valid
# when feed to the runner
# i.e. "PrOdUCTs    with nAMe j where  YG ~pol"
npm run unparse