Harvester is a data collector, parser and processor. It reads, modifies and writes data in a lightweight, highly configurable pipeline. It is written in Go, which ensures both high performance a low footprint to optimize system resources.

Both the input and output sources and the intermediate processors can be easily configured by declaring blocks in the config file. Currently CSV, JSON and apache2/nginx logs format are supported, and there is also a RegExp reader that allows reading any arbitrary source that can be parsed with regular expressions. Outputting to MongoDB, HTTP and ElasticSearch is also possible.

From the project root, run:

go get -t ./...

and compile with:

go build commands/harvester.go

so you get the self-contained binary. At this point you might want to move it to /usr/local/bin or any other place in your PATH you feel it's appropriate. To run harvester, and provided that harvester is in your path, type:

harvester -config /path/to/your/config/file.conf

The config file follows the git-config/ini format specified in the gcfg package.

Read/write and processor modules are declared with ini sections, and their properties declared within the block:

[output-dummy "my-writer-name"]
print = true

In this block, a dummy output module was declared with the name "my-writer-name", and its flag print was set to true.

There are five type of modules in Harvester.

• input: An input is a module that declares a source from which data can be read. It holds information on how to connecto to a certain location or server to stream data (i.e.: read a log in the filesystem, or connect to a certain folder in an Amazon S3 server).
• output: output models are, similarly to input ones, a declaration of a location or server where the data strem will be saved.
• processor: A processor is a module that is placed in the middle of the stream and updates, changes, removes or collects information about the data.
• reader: A reader is a module that connects an input source with one or more processors.
• writer: A writer is a module that connects a reader with one or more output modules.

There are several input, output and processor modules available. The documentation for each one of them is located in the src/input, src/output and src/processor packages, respectively.

Copyright 2013-2015 Máximo Cuadros. Licensed under the MIT License.