influxdb-client-ruby

This repository contains the reference Ruby client for the InfluxDB 2.0.

Note: This library is for use with InfluxDB 2.x. For connecting to InfluxDB 1.x instances, please use the influxdb-ruby client.

Disclaimer: This library is a work in progress and should not be considered production ready yet.

Installation

The InfluxDB 2 client is bundled as a gem and is hosted on Rubygems.

Install the Gem

The client can be installed manually or with bundler.

To install the client gem manually:

gem install influxdb-client -v 1.0.0.beta

Usage

Creating a client

Use InfluxDB::Client to create a client connected to a running InfluxDB 2 instance.

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token')

Client Options

Option	Description	Type	Default
bucket	Default destination bucket for writes	String	none
org	Default organization bucket for writes	String	none
precision	Default precision for the unix timestamps within the body line-protocol	String	none
open_timeout	Number of seconds to wait for the connection to open	Integer	10
write_timeout	Number of seconds to wait for one block of data to be written	Integer	10
read_timeout	Number of seconds to wait for one block of data to be read	Integer	10
max_redirect_count	Maximal number of followed HTTP redirects	Integer	10
use_ssl	Turn on/off SSL for HTTP communication	bool	true

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
  bucket: 'my-bucket',
  org: 'my-org',
  precision: InfluxDB2::WritePrecision::NANOSECOND)

Queries

The result retrieved by QueryApi could be formatted as a:

Raw query response
Flux data structure: FluxTable, FluxColumn and FluxRecord
Stream of FluxRecord

Query raw

Synchronously executes the Flux query and return result as unprocessed String

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
                              bucket: 'my-bucket',
                              org: 'my-org')

query_api = client.create_query_api
result = query_api.query_raw(query: 'from(bucket:"' + bucket + '") |> range(start: 1970-01-01T00:00:00.000000001Z) |> last()')

Synchronous query

Synchronously executes the Flux query and return result as a Array of FluxTables

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
                              bucket: 'my-bucket',
                              org: 'my-org')

query_api = client.create_query_api
result = query_api.query(query: 'from(bucket:"' + bucket + '") |> range(start: 1970-01-01T00:00:00.000000001Z) |> last()')

Query stream

Synchronously executes the Flux query and return stream of FluxRecord

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
                              bucket: 'my-bucket',
                              org: 'my-org')

query_api = client.create_query_api

query = 'from(bucket: "my-bucket") |> range(start: -10m, stop: now()) ' \
      "|> filter(fn: (r) => r._measurement == \"#{measurement}\")"

query_api.query_stream(query: query).each do |record|
  puts record.to_s
end

Writing data

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
                              bucket: 'my-bucket',
                              org: 'my-org',
                              precision: InfluxDB2::WritePrecision::NANOSECOND)

write_api = client.create_write_api
write_api.write(data: 'h2o,location=west value=33i 15')

Time precision

Configure default time precision:

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
                              bucket: 'my-bucket',
                              org: 'my-org',
                              precision: InfluxDB2::WritePrecision::NANOSECOND)

Configure precision per write:

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
                                  bucket: 'my-bucket',
                                  org: 'my-org')

write_api = client.create_write_api
write_api.write(data: 'h2o,location=west value=33i 15', precision: InfluxDB2::WritePrecision::SECOND)

Allowed values for precision are:

InfluxDB::WritePrecision::NANOSECOND for nanosecond
InfluxDB::WritePrecision::MICROSECOND for microsecond
InfluxDB::WritePrecision::MILLISECOND for millisecond
InfluxDB::WritePrecision::SECOND for second

Configure destination

Default bucket and organization destination are configured via InfluxDB::Client:

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
                              bucket: 'my-bucket',
                              org: 'my-org')

but there is also possibility to override configuration per write:

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token')

write_api = client.create_write_api
write_api.write(data: 'h2o,location=west value=33i 15', bucket: 'production-data', org: 'customer-1')

Data format

The data could be written as:

String that is formatted as a InfluxDB's line protocol
Hash with keys: name, tags, fields and time
Data Point structure
Array of above items

client = InfluxDB2::Client.new('https://localhost:9999', 'my-token',
                              bucket: 'my-bucket',
                              org: 'my-org',
                              precision: InfluxDB2::WritePrecision::NANOSECOND)

point = InfluxDB2::Point.new(name: 'h2o')
                       .add_tag('location', 'europe')
                       .add_field('level', 2)

hash = { name: 'h2o',
         tags: { host: 'aws', region: 'us' },
         fields: { level: 5, saturation: '99%' }, time: 123 }

write_api = client.create_write_api
write_api.write(data: ['h2o,location=west value=33i 15', point, hash])

Local tests

brew install wget # on a mac, if not yet installed!
bin/influxdb-restart.sh
rake test

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/influxdata/influxdb-client-ruby.

License

The gem is available as open source under the terms of the MIT License.

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