README

This library allows you to generate an index of hashed values from a csv file or a list of json strings.

The result is a yaml file that can be easily used for quick diffs in order to spot changes, additions and deletions.

Pre-requisite

• php 7.1
• ext-json

Installation

Run composer require skyree/document-hash-indexer from your project.

Getting started

All it takes is to instantiate a HashIndexer and run the hash method with the desired key.

Example

$hashIndexer = new HashIndexer(new JsonParser(), new LazyErrorHandler());
$outputFile = $hashIndexer->hash('file.json', 'foo');
echo file_get_contents($outputFile);

with file.json containing the following

{"foo": "aaa", "bar": [{"a":  1, "b": 2}]}
{"foo": "bbb", "bar": [{"y":  4, "z": 5}]}

will result in

aaa: 7dc9c52dbf3e5a436ac2a40affed4d16
bbb: 288a8a3a1c2a8a370ea20b88b9b0f426

Important note: As mentioned in the description, for json documents, the expected input is list of json strings, not a properly formatted json object.

Important note 2: Make sure your input document has a unique key (a csv column whose values are all different or a json node whose value differs for each line), otherwise the generated yaml will be invalid as duplicates are forbidden.

Parsers

This library comes with 2 parsers:

• ParserJson
• ParserCsv

You can create and use your own parsers by implementing ParserInterface

ErrorHandlers

These handlers are used to provide a behavior when a key is not found on a line; This library comes with 2 handlers:

• LazyErrorHandler which basically ignores the error
• ThresholdErrorHandler which allows up to n errors before interrupting

You can create and use your own handlers by implementing ErrorHandlerInterface

Integration with Symfony

This library can easily be defined as one or multiple services

Skyree\DocumentHashIndexer\Parser\JsonParser: ~

Skyree\DocumentHashIndexer\Parser\CsvParser: ~

Skyree\DocumentHashIndexer\ErrorHandler\LazyErrorHandler: ~

my_project.json_hash_indexer:
    class: Skyree\DocumentHashIndexer\HashIndexer
    arguments:
        $parser: '@Skyree\DocumentHashIndexer\Parser\JsonParser'
        $errorHandler: '@Skyree\DocumentHashIndexer\ErrorHandler\LazyErrorHandler'

my_project.csv_hash_indexer:
    class: Skyree\DocumentHashIndexer\HashIndexer
    arguments:
        $parser: '@Skyree\DocumentHashIndexer\Parser\CsvParser'
        $errorHandler: '@Skyree\DocumentHashIndexer\ErrorHandler\LazyErrorHandler'