node-mongodb-es-connector

MongoDB and ElasticSearch sync module for node (support attachment sync)

Supports one-to-one and one-to-many relationships.

Chinese Documentation - 中文文档

• one-to-one - one mongodb collection to one elasticsearch index
• one-to-many - one mongodb collection to one elasticsearch server many indexs, or one mongodb collection to many elasticsearch servers one index

my current version

elasticsearch: v6.1.2
mongodb: v3.6.2
Nodejs: v8.9.3

What does it do

node-mongodb-es-connector package keeps your mongoDB collections and elastic search cluster in sync. It does so by tailing the mongo oplog and replicate whatever crud operation into elastic search cluster without any overhead. Please note that a replica set is needed for the package to tail mongoDB.(support attentment sync)

How to use

npm install es-mongodb-sync

or Download from GitHub.

Sample usage

Create a file in the crawlerData folder,the Naming rules is ElasticSearchIndexName.json or any name .json.

If you have more additional configuration in the crawlerData folder.

For example:

mybooks.json

{
    "mongodb": {
        "m_database": "myTest",
        "m_collectionname": "books",
        "m_filterfilds": {
            "version" : "2.0"
        },
        "m_returnfilds": {
            "bName": 1,
            "bPrice": 1,
            "bImgSrc": 1
        },
        "m_extendfilds": {
            "bA": "this is a extend fild bA",
            "bB": "this is a extend fild bB"
        },
        "m_extendinit": {
            "m_comparefild": "_id",
            "m_comparefildType": "ObjectId",
            "m_startFrom": "2018-07-20 13:44:00",
            "m_endTo": "2018-07-20 13:46:59"
        },
        "m_connection": {
            "m_servers": [
                "localhost:29031",
                "localhost:29032",
                "localhost:29033"
            ],
            "m_authentication": {
                "username": "UserAdmin",
                "password": "pass1234",
                "authsource":"admin",
                "replicaset":"my_replica",
                "ssl":false
            }
        },
        "m_documentsinbatch": 5000,
        "m_delaytime": 1000,
        "max_attachment_size":5242880
    },
    "elasticsearch": {
        "e_index": "mybooks",
        "e_type": "books",
        "e_connection": {
            "e_server": "http://localhost1:9200,http://localhost2:9200,http://localhost3:9200",
            "e_httpauth": {
                "username": "EsAdmin",
                "password": "pass1234"
            }
        },
        "e_pipeline": "mypipeline",
        "e_iscontainattachment": true
    }
}

• m_database - MongoDB dataBase to watch. (required)
• m_collectionname - MongoDB collection to watch. (required)
• m_filterfilds - MongoDB filterQuery,support simple filter.(Default value is null). (required)
• m_returnfilds - MongoDB need to return to the field.(Default value is null). (required)
• m_extendfilds - MongoDB expand field.(can default key and value). (selective)
• m_extendinit - Mongodb initialization supplemental configuration. (Default value is null). (selective)
  • m_comparefild - MongoDB compare fild.(Default value is _id or other). (selective)
  • m_comparefildType - MongoDB compare fild type.(Default value is ObjectId or DateTime). (selective)
  • m_startFrom - StartTime.(Default value is a DateTime). (selective)
  • m_endTo - EndTime.(Default value is a DateTime). (selective)
• m_connection (required)
  • m_servers - MongoDB servers.(Array). (required)
  • m_authentication - If you do not need to verify the default value is null. (required)
    • username - MongoDB connection userName. (required)
    • password - MongoDB connection passWord. (required)
    • authsource - MongoDB user authentication. (required)
    • replicaset - MongoDB replicaSet name. (required)
    • ssl - MongoDB ssl.(Default value is false). (selective)
• m_url - replace m_connection(Either-or) (selective).
• m_documentsinbatch - An integer that specifies number of documents to send to ElasticSearch in batches (can be set to very high number). (required)
• m_delaytime - Number of milliseconds between batches the default value is 1000ms. (required)
• max_attachment_size - Attachment max size the default value is 5242880byte. (selective)
• e_index - ElasticSearch index where documents from watcher collection is saved. (required)
• e_type - ElasticSearch type given to documents from watcher collection. (required)
• e_connection (required)
  • e_server - URL to a running ElasticSearch cluster. (required)
  • e_httpauth - If you do not need to verify the default value is null. (selective)
    • username - ElasticSearch connection userName. (selective)
    • password - ElasticSearch connection passWord. (selective)
• e_pipeline - ElasticSearch pipeline name. (selective)
• e_iscontainattachment - Is or not contain attachment the default value is false. (selective)

Start up

node app.js

Extra APIs

index.js (only crud config json )

Example

1.start() - must start up before all the APIs.

---

2.addWatcher() - add a config json.

Parameters:

Name	Type
fileName	string
obj	jsonObject

return: true or false

---

3.updateWatcher() - update a config json.

Parameters:

Name	Type
fileName	string
obj	jsonObject

return: true or false

---

4.deleteWatcher() - delete a config json.

Parameters:

Name	Type
fileName	string

return: true or false

---

5.isExistWatcher() - check out this config json exist.

Parameters:

Name	Type
fileName	string

return: true or false

---

6.getInfoArray() - get every config status.(waiting/initialling/running/stoped).

---

ChangeLog

• v1.1.12 - update promise plugin,and referencing the Bluebird plugin in the project.Real-time synchronization in support of more than 1000 indexes.Message queues using promise.
• v2.0.0 - support elasticsearch pipeline aggregations and attachment into elasticsearch.
• v2.0.12 - add watch config file sync status(getInfoArray()).
• v2.0.18 - update logs directory.
• v2.1.1 - update init method (master doc->attachment).
• v2.1.8 - use promise queue (init and mongo-oplog).
• v2.1.9 - add m_extendfilds and m_extendinit.
• v2.1.16 - add timed task about watch mongodb, add timestamp for init data, cancel full data synchronization in init.
• v2.1.20 - support elasticsearch cluster synchronization.
• v2.1.21 - support configuration file encryption.

How to use pipeline

• Install Ingest Attachment Processor Plugin

  https://www.elastic.co/guide/en/elasticsearch/plugins/6.3/ingest-attachment.html

  more Elasticsearch Pipeline knowledge： https://hacpai.com/article/1512990272091

• prepare make a pipeline in elasticsearch

PUT _ingest/pipeline/mypipeline
{
  "description" : "Extract attachment information from arrays",
  "processors" : [
    {
      "foreach": {
        "field": "attachments",
        "processor": {
          "attachment": {
            "target_field": "_ingest._value.attachment",
            "field": "_ingest._value.data"
          }
        }
      }
    }
  ]
}

Result

• mongodbData

• elasticsearch

Test

License

The MIT License (MIT). Please see LICENSE for more information.