Search3 - Erlang

This is the erlang component of a new text search application built on top of FoundationDB. The java component resides at:

https://github.com/cloudant-labs/search3-java

The two components communicate via gRPC. This erlang application is a client and sends messages to the java component which acts as the server. Messages are sent via generated stubs using https://github.com/tsloughter/grpcbox.

FoundationDB, search3-erl, and search3-java all must be up in order for text search to work.

Currently, we are in the beta version, and we support:

1. Basic Field Search
2. Sorting by string and number.
3. Bookmarks
4. Limit
5. Group Search
6. Different default Analyzers and per_field Analyzers
7. Facet Search
8. Highlighting

Code layout:

• search3.proto - This is the grpc proto file. We use this to generate search_client.
• search3_httpd - This handles the _search endpoint
• search3_epi - Hooks into couch_epi plugin
• search3_httpd - Handles _search endpoint
• search3_httpd_handlers - Httpd handler for search3_epi
• search3_indexer - All indexing capabilities reside in this module.
• search3_jobs - Hooks indexing into the new couch_jobs system.
• search3_response - Parses grpc message from server and formats it into json.
• search3_rpc - Layer on top of search_client, which is the generated stub code from grpcbox.
• search3_sup - Generic supervisor for search3_worker_manager
• search3_util - Utility functions
• search3_worker_manager - spawns search3_indexer processes for indexing