# Analytics extraction plugin

Extract commit and review data from Gerrit projects and expose aggregated metrics
over REST and SSH API.

## How to build

To build the analytics plugin you need to have SBT 0.13.x or later installed.
If you have a Linux operating system, see the
[Installing SBT on Linux instructions](http://www.scala-sbt.org/0.13/docs/Installing-sbt-on-Linux.html)

Clone the analytics plugin and execute ```sbt assembly```.

Example:

```
   $ git clone https://gerrit.googlesource.com/plugins/analytics
   $ cd analytics && sbt assembly
```

The plugin jar file is created under ```target/scala-2.11/analytics.jar```

## How to install

Copy the analytics.jar generated onto the Gerrit's /plugins directory.

## How to configure

Nothing to configure, it just works.

## How to use

Adds new REST API and SSH commands to allow the extraction of repository
statistics from Gerrit repositories and changes.

## API

All the API share the same syntax and behaviour. Differently from the standard
Gerrit REST API, the JSON collections are returned as individual lines and
streamed over the socket I/O. The choice is driven by the fact that the typical
consumer of these API is a BigData batch process, typically external to Gerrit
and hosted on a separate computing cluster.

A large volume of data can be potentially generated: splitting the output file
into separate lines helps the BigData processing in the splitting, shuffling and
sorting phase.

### Contributors

Extract a unordered list of project contributors statistics, including the
commits data relevant for statistics purposes, such as number of involved files, and optionally also the list of belonging branches,
number of added/deleted lines, timestamp and merge flag.


*REST*

/projects/{project-name}/analytics~contributors[?since=2006-01-02[15:04:05[.890][-0700]]][&until=2018-01-02[18:01:03[.333][-0700]]][&aggregate=email_year]

*SSH*

analytics contributors {project-name} [--since 2006-01-02[15:04:05[.890][-0700]]] [--until 2018-01-02[18:01:03[.333][-0700]]]

### Parameters

- --since -b Starting timestamp to consider
- --until -e Ending timestamp (excluded) to consider
- --aggregate -granularity -g one of email, email_year, email_month, email_day, email_hour defaulting to aggregation by email
- --extract-branches -r enables branches extraction for each commit

NOTE: Timestamp format is consistent with Gerrit's query syntax, see /Documentation/user-search.html for details.

REST Example:

```
   $ curl http://gerrit.mycompany.com/projects/myproject/analytics~contributors
   {"name":"John Doe","email":"john.doe@mycompany.com","num_commits":1, "num_files":4,"added_lines":9,"deleted_lines":1, "commits":[{"sha1":"6a1f73738071e299f600017d99f7252d41b96b4b","date":"Apr 28, 2011 5:13:14 AM","merge":false}]}
   {"name":"Matt Smith","email":"matt.smith@mycompany.com","num_commits":1, "num_files":1,"added_lines":90,"deleted_lines":10,"commits":[{"sha1":"54527e7e3086758a23e3b069f183db6415aca304","date":"Sep 8, 2015 3:11:23 AM","merge":true}],"branches":["master","branch1"]}
```

SSH Example:

```
   $ ssh -p 29418 admin@gerrit.mycompany.com analytics contributors myproject --since 2017-08-01 --until 2017-12-31
   {"name":"John Doe","email":"john.doe@mycompany.com","num_commits":1, "num_files":4,"added_lines":9,"deleted_lines":1, "commits":[{"sha1":"6a1f73738071e299f600017d99f7252d41b96b4b","date":"Apr 28, 2011 5:13:14 AM","merge":false}]}
   {"name":"Matt Smith","email":"matt.smith@mycompany.com","num_commits":1, "num_files":1,"added_lines":90,"deleted_lines":10,"commits":[{"sha1":"54527e7e3086758a23e3b069f183db6415aca304","date":"Sep 8, 2015 3:11:23 AM","merge":true}],"branches":["master","branch1"]}
```