benthos

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Published: May 17, 2017 License: MIT

README

Benthos

Benthos is a messaging bridge service that supports a wide and growing list of input and output protocols.

A range of internal buffer strategies are available, allowing you to select a balance between latency, protection against back pressure and file based persistence, or nothing at all (direct bridge).

Design

Benthos has inputs, an optional buffer, and outputs, which are all set in a single config file.

+--------------------------------------+
|            Input Stream              |
| ( ZMQ, NSQ, AMQP, Kafka, HTTP, ... ) |--+
+--------------------------------------+  |
                                          v
             +--------------------------------------------+
             |                   Buffer                   |
             | ( Memory-Mapped Files, Memory, None, etc ) |
             +--------------------------------------------+
                             |
                             |  +--------------------------------------+
                             +->|             Output Stream            |
                                | ( ZMQ, NSQ, AMQP, Kafka, HTTP, ... ) |
                                +--------------------------------------+

Supported Protocols

Currently supported input/output targets:

You can also have multiple outputs or inputs by choosing a routing strategy (fan in, fan out, round robin, etc.)

For a full and up to date list you can print them from the binary:

# Print inputs, buffers and output options
benthos --print-inputs --print-buffers --print-outputs | less

Install

Build with Go:

go get github.com/jeffail/benthos/cmd/...

Or, download from here.

Run

benthos -c ./config.yaml

Config

Check out the samples in ./config, or create a fully populated default configuration file:

benthos --print-yaml > config.yaml
benthos --print-json > config.json

The configuration file should contain a section for an input, output, and a buffer. For example, if we wanted to output to a ZMQ4 push socket our output section in a YAML config might look like this:

output:
  type: zmq4
  zmq4:
    addresses:
      - tcp://*:1234
    socket_type: PUSH

There are also configuration sections for logging and metrics, if you print an example config you will see the available options.

Speed and Benchmarks

Benthos isn't doing much, so it's reasonable to expect low latencies and high throughput. Here's a table of benchmarks from an 4-core (2.4ghz) machine, bridging messages of 5000 bytes through a 500MB memory buffer via various protocols:

Avg. Latency (ms) 99th P. Latency (ms) Msg/s Mb/s
ZMQ 5.940 67.268 31357 157.383
Nano 3.312 20.020 22894 114.907
HTTP 0.549 8.751 4280 21.479

Take these results with a pinch of salt. I've added some benchmarking utilities in ./cmd/test, hopefully a third party can cook us up some more meaningful figures from a better set up than I have.

ZMQ4 Support

Benthos supports ZMQ4 for both data input and output. To add this you need to install libzmq4 and use the compile time flag when building benthos:

go install -tags "ZMQ4" ./cmd/...

Vendoring

Versions of go above 1.6 should automatically go get all vendored libraries. Otherwise, while cloning use --recursive:

git clone https://github.com/jeffail/benthos --recursive

Or, if the repo is already cloned, get the latest libraries with:

git submodule update --init

To add new libraries simply run:

PACKAGE=github.com/jeffail/util
git submodule add https://$PACKAGE vendor/$PACKAGE"

It might be handy to set yourself a function for this in your .bashrc:

function go-add-vendor {
	git submodule add https://$1 vendor/$1
}

Docker

There's a Dockerfile for creating a benthos docker image. This is built from scratch and so you'll need to build without CGO (CGO_ENABLED=0) for your benthos build to run within it. Create it like this:

CGO_ENABLED=0 make docker
docker run --rm benthos

Then use the image:

docker run --rm -v ~/benthos.yaml:/config.yaml -v /tmp/data:/data -p 8080:8080 \
	benthos -c /config.yaml

Directories

Path Synopsis
cmd
lib
broker
Package broker - Implements types used for routing inputs to outputs in non-trivial arrangements, such as fan-out or fan-in models.
Package broker - Implements types used for routing inputs to outputs in non-trivial arrangements, such as fan-out or fan-in models.
buffer
Package buffer - Links an input and an output together and buffers messages in between.
Package buffer - Links an input and an output together and buffers messages in between.
buffer/impl
Package impl - Contains implementations of various buffer types.
Package impl - Contains implementations of various buffer types.
input
Package input - Defines consumers for aggregating data from a variety of sources.
Package input - Defines consumers for aggregating data from a variety of sources.
output
Package output - Defines dispatchers of data for a variety of targets.
Package output - Defines dispatchers of data for a variety of targets.
types
Package types - Defines any general structs and interfaces used throughout the benthos code base.
Package types - Defines any general structs and interfaces used throughout the benthos code base.
util/disk
Package disk - Cross platform disk statistics.
Package disk - Cross platform disk statistics.
util/test
Package test - Helpers for setting up test utilties.
Package test - Helpers for setting up test utilties.

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