sensorserver

Sensorserver

Sensorserver is simple all-in-one solution for store and serve timeseries from sensors. I develop this application for my Raspberry Pi.

Build

./prepare.sh
go get -u github.com/0rph3us/astrotime
go get -u github.com/BurntSushi/toml
go get -u github.com/gin-gonic/gin
go get -u github.com/boltdb/bolt

go run cmd/main.go

build package

You need fpm for building the package.

./build.sh

Dependencies

• Gin the web framework
• toml is the format for the configuration file
• BoltDB the storage backend
• Astrotime for calculate the sunset and sunrise

API

/boltdb/backup

Support GET and HEAD requests. Get a binary stream of the database file.

curl -J -O http://127.0.0.1:8080/boltdb/backup

/boltdb/stats

Support GET and HEAD requests. The response is a JSON.

curl 127.0.0.1:8080/boltdb/stats?pretty=true

/sensor

Support GET, HEAD and PUT requests. The GET response is JSON Array with the name of all sensors. The PUT method put date from different sensors into to storage backend.

curl -XPUT 'http://127.0.0.1:8080/sensor' -d '[
    {
        "Timestamp": 1445311973,
        "Sensors": {
            "temp_bmp085": 23.5,
            "humidity": 43.7,
            "pressure": 1004.53467
        }
    },
    {
        "Timestamp": 1445312973,
        "Sensors": {
            "temp_bmp085": 23.4,
            "humidity": 43.6,
            "pressure": 1002.8329
        }
    }
]'

/sensor/:name

Support GET, HEAD and PUT requests for a specific sensor. GET returns a JSON array with timestamp-value objects. The timestamp is in seconds since 01.01.1970

curl -XGET 'http://127.0.0.1:8080/sensor/pressure?pretty=true'
[
    {
        "Timestamp": 1413011716487,
        "Value": 1003.35
    },
    {
        "Timestamp": 1413076519461,
        "Value": 1003.17896
    },
    {
        "Timestamp": 1413141322435,
        "Value": 1002.38873
    },
    {
        "Timestamp": 1413206125409,
        "Value": 996.93915
    }
]

The PUT method put new data into the server. The timestamp is a normal 32 Bit Unixtimestamp.

curl -XPUT 'http://127.0.0.1:8080/sensor/humidity' -d '[
    {
        "Timestamp": 1412979315,
        "Value": 57.9
    },
    {
        "Timestamp": 1412979343,
        "Value": 58
    },
    {
        "Timestamp": 1412979394,
        "Value": 58
    },
    {
        "Timestamp": 1412979407,
        "Value": 58.1
    },
    {
        "Timestamp": 1412979417,
        "Value": 57.9
    },
    {
        "Timestamp": 1412979437,
        "Value": 58.1
    },
    {
        "Timestamp": 1412979557,
        "Value": 58.3
    }
]'

Alternative

• influxDB
• prometheus
• graphite

All alternatives looks good. Graphite has the most functions, but the project looks dead. Grafana is a very good frontend for the 3 backends. This plugin is required for the prometheus datasource.