normalizer

README

Message normalizer

Normalizer service consumes events published by adapters, normalizes SenML-formatted ones, and publishes them to the post-processing stream.

Configuration

The service is configured using the environment variables presented in the following table. Note that any unset variables will be replaced with their default values.

Variable	Description	Default
MF_NATS_URL	NATS instance URL	nats://localhost:4222
MF_NORMALIZER_LOG_LEVEL	Log level for the Normalizer	error
MF_NORMALIZER_PORT	Normalizer service HTTP port	8180

Deployment

The service itself is distributed as Docker container. The following snippet provides a compose file template that can be used to deploy the service container locally:

version: "2"
services:
  normalizer:
    image: mainflux/normalizer:[version]
    container_name: [instance name]
    environment:
      MF_NATS_URL: [NATS instance URL]
      MF_NORMALIZER_LOG_LEVEL: [Normalizer log level]
      MF_NORMALIZER_PORT: [Service HTTP port]

To start the service outside of the container, execute the following shell script:

# download the latest version of the service
go get github.com/mainflux/mainflux

cd $GOPATH/src/github.com/mainflux/mainflux

# compile the service; make sure to set the proper GOOS value
make normalizer

# copy binary to bin
make install

# set the environment variables and run the service
MF_NATS_URL=[NATS instance URL] MF_NORMALIZER_LOG_LEVEL=[Normalizer log level] MF_NORMALIZER_PORT=[Service HTTP port] $GOBIN/mainflux-normalizer

Documentation

Overview

Package normalizer contains the domain concept definitions needed to support Mainflux normalizer service functionality.

Index

• type NormalizedData
• type Service
  • func New() Service

Types

type NormalizedData

type NormalizedData struct {
	ContentType string
	Messages    []mainflux.Message
}

NormalizedData contains normalized messages and their content type.

type Service

type Service interface {
	// Normalizes raw message to array of standard SenML messages.
	Normalize(mainflux.RawMessage) (NormalizedData, error)
}

Service specifies API for normalizing messages.

func New

func New() Service

New returns normalizer service implementation.