# PostgreSQL to Elasticsearch/OpenSearch sync
- [PGSync](https://pgsync.com) is a middleware for syncing data from [Postgres](https://www.postgresql.org) to [Elasticsearch](https://www.elastic.co/products/elastic-stack)/[OpenSearch](https://opensearch.org/) or [OpenSearch](https://opensearch.org/).
- It allows you to keep [Postgres](https://www.postgresql.org) as your source of truth data source and
expose structured denormalized documents in [Elasticsearch](https://www.elastic.co/products/elastic-stack)/[OpenSearch](https://opensearch.org/).
### Requirements
- [Python](https://www.python.org) 3.7+
- [Postgres](https://www.postgresql.org) 9.6+
- [Redis](https://redis.io) 3.1.0
- [Elasticsearch](https://www.elastic.co/products/elastic-stack) 6.3.1+ or [OpenSearch](https://opensearch.org/) 1.3.7+
- [SQlAlchemy](https://www.sqlalchemy.org) 1.3.4+
### Postgres setup
Enable [logical decoding](https://www.postgresql.org/docs/current/logicaldecoding.html) in your
Postgres setting.
- You also need to set up two parameters in your Postgres config postgresql.conf
```wal_level = logical```
```max_replication_slots = 1```
### Installation
You can install PGSync from [PyPI](https://pypi.org):
$ pip install pgsync
### Config
Create a schema for the application named e.g **schema.json**
[Example schema](https://github.com/toluaina/pgsync/blob/main/examples/airbnb/schema.json)
Example spec
.. code-block::
[
{
"database": "[database name]",
"index": "[Elasticsearch or OpenSearch index]",
"nodes": {
"table": "[table A]",
"schema": "[table A schema]",
"columns": [
"column 1 from table A",
"column 2 from table A",
... additional columns
],
"children": [
{
"table": "[table B with relationship to table A]",
"schema": "[table B schema]",
"columns": [
"column 1 from table B",
"column 2 from table B",
... additional columns
],
"relationship": {
"variant": "object",
"type": "one_to_many"
},
...
},
{
... additional children
}
]
}
}
]
### Environment variables
Setup environment variables required for the application
SCHEMA='/path/to/schema.json'
ELASTICSEARCH_HOST=localhost
ELASTICSEARCH_PORT=9200
PG_HOST=localhost
PG_USER=i-am-root # this must be a postgres superuser or replication user
PG_PORT=5432
PG_PASSWORD=*****
REDIS_HOST=redis
REDIS_PORT=6379
REDIS_DB=0
REDIS_AUTH=*****
### Running
Bootstrap the database (one time only)
- $ bootstrap --config schema.json
Run pgsync as a daemon
- $ pgsync --config schema.json --daemon
Raw data
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