influxdb-client-ruby

This repository contains the reference Ruby client for the InfluxDB 2.x.

Note: Use this client library with InfluxDB 2.x and InfluxDB 1.8+ (see details). For connecting to InfluxDB 1.7 or earlier instances, use the influxdb-ruby client library.

• Features
• Installation
  • Install the Gem
• Usage
  • Creating a client
  • Writing data
  • Querying data
  • Delete data
  • Management API
• Advanced Usage
  • Default Tags
  • Proxy configuration
• Contributing
• License

Documentation

This section contains links to the client library documentation.

• Product documentation, Getting Started
• Examples
• API Reference
• Changelog

Features

InfluxDB 2.x client consists of two packages

• influxdb-client
  • Querying data using the Flux language
  • Writing data
    • batched in chunks on background
    • automatic retries on write failures
• influxdb-client-apis
  • provides all other InfluxDB 2.x APIs for managing
    • buckets
    • labels
    • authorizations
    • …
  • built on top of influxdb-client

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 3.1.0

For management API:

gem install influxdb-client-apis -v 3.1.0

Usage

Creating a client

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

client = InfluxDB2::Client.new('https://localhost:8086', 'my-token')
client.do_something
client.close!

the InfluxDB::Client can be also used as a resource:

InfluxDB2::Client.use('https://localhost:8086', 'my-token') do |client|
  client.do_something
end

Client Options

client = InfluxDB2::Client.new('https://localhost:8086', 'my-token',
  bucket: 'my-bucket',
  org: 'my-org',
  precision: InfluxDB2::WritePrecision::NANOSECOND)

Queries

The result retrieved by QueryApi could be formatted as a:

1. Raw query response
2. Flux data structure: FluxTable, FluxColumn and FluxRecord
3. Stream of FluxRecord

Query raw

Synchronously executes the Flux query and return result as unprocessed String

InfluxDB2::Client.use('https://localhost:8086', 'my-token', org: 'my-org') do |client|
  result = client
    .create_query_api
    .query_raw(query: 'from(bucket:"my-bucket") |> range(start: 1970-01-01) |> last()')
  puts result
end

Synchronous query

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

InfluxDB2::Client.use('https://localhost:8086', 'my-token', org: 'my-org') do |client|
  result = client
    .create_query_api
    .query(query: 'from(bucket:"my-bucket") |> range(start: 1970-01-01) |> last()')
  result.each do |table|
    table.records.each { |record| puts record.values }
  end
end

Query stream

Synchronously executes the Flux query and return stream of FluxRecord

InfluxDB2::Client.use('https://localhost:8086', 'my-token', org: 'my-org') do |client|
  stream = client
    .create_query_api
    .query_stream(query: 'from(bucket:"my-bucket") |> range(start: 1970-01-01) |> last()')
  stream.each do |record|
    puts record.values
  end
end

Parameterized queries

InfluxDB Cloud supports Parameterized Queries that let you dynamically change values in a query using the InfluxDB API. Parameterized queries make Flux queries more reusable and can also be used to help prevent injection attacks.

InfluxDB Cloud inserts the params object into the Flux query as a Flux record named params. Use dot or bracket notation to access parameters in the params record in your Flux query. Parameterized Flux queries support only int , float, and string data types. To convert the supported data types into other Flux basic data types, use Flux type conversion functions.

Parameterized query example:

⚠️ Parameterized Queries are supported only in InfluxDB Cloud, currently there is no support in InfluxDB OSS.

InfluxDB2::Client.use('https://localhost:8086', 'my-token', org: 'my-org') do |client|
    query = 'from(bucket: params.bucketParam) |> range(start: duration(v: params.startParam))'
    params = { 'bucketParam' => 'my-bucket', 'startParam' => '-1h' }
    query_api = client.create_query_api
    result = query_api.query(query: query, params: params)
    result[0].records.each { |record| puts "#{record.time} #{record.measurement}: #{record.field} #{record.value}" }
end

Writing data

The WriteApi supports synchronous and batching writes into InfluxDB 2.x. In default api uses synchronous write. To enable batching you can use WriteOption.

InfluxDB2::Client.use('https://localhost:8086', 'my-token',
                      bucket: 'my-bucket',
                      org: 'my-org',
                      precision: InfluxDB2::WritePrecision::NANOSECOND) do |client|
  write_api = client.create_write_api
  write_api.write(data: 'h2o,location=west value=33i 15')
end

Batching

The writes are processed in batches which are configurable by WriteOptions:

InfluxDB2::Client.use('http://localhost:8086',
                      'my-token',
                      bucket: 'my-bucket',
                      org: 'my-org',
                      precision: InfluxDB2::WritePrecision::NANOSECOND,
                      use_ssl: false) do |client|
  write_options = InfluxDB2::WriteOptions.new(write_type: InfluxDB2::WriteType::BATCHING,
                                              batch_size: 10, flush_interval: 5_000,
                                              max_retries: 3, max_retry_delay: 15_000,
                                              exponential_base: 2)
  write_api = client.create_write_api(write_options: write_options)
  write_api.write(data: 'h2o,location=west value=33i 15')
end

Time precision

Configure default time precision:

InfluxDB2::Client.use('https://localhost:8086', 'my-token',
                      bucket: 'my-bucket',
                      org: 'my-org',
                      precision: InfluxDB2::WritePrecision::NANOSECOND) do |client|
  client.do_something
end

Configure precision per write:

InfluxDB2::Client.use('https://localhost:8086', 'my-token',
                      bucket: 'my-bucket',
                      org: 'my-org',
                      precision: InfluxDB2::WritePrecision::NANOSECOND) do |client|
  write_api = client.create_write_api
  write_api.write(data: 'h2o,location=west value=33i 15', precision: InfluxDB2::WritePrecision::SECOND)
end

Allowed values for precision are:

• InfluxDB2::WritePrecision::NANOSECOND for nanosecond
• InfluxDB2::WritePrecision::MICROSECOND for microsecond
• InfluxDB2::WritePrecision::MILLISECOND for millisecond
• InfluxDB2::WritePrecision::SECOND for second

Configure destination

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

InfluxDB2::Client.use('https://localhost:8086', 'my-token',
                      bucket: 'my-bucket',
                      org: 'my-org') do |client|
  client.do_something
end

but there is also possibility to override configuration per write:

InfluxDB2::Client.use('https://localhost:8086', 'my-token') do |client|
  write_api = client.create_write_api
  write_api.write(data: 'h2o,location=west value=33i 15', bucket: 'production-data', org: 'customer-1')
end

Data format

The data could be written as:

1. String that is formatted as a InfluxDB’s line protocol
2. Hash with keys: name, tags, fields and time
3. Data Point structure
4. Array of above items

InfluxDB2::Client.use('https://localhost:8086', 'my-token',
                      bucket: 'my-bucket',
                      org: 'my-org',
                      precision: InfluxDB2::WritePrecision::NANOSECOND) do |client|
  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])
end

Default Tags

Sometimes is useful to store same information in every measurement e.g. hostname, location, customer. The client is able to use static value, app settings or env variable as a tag value.

The expressions:

• California Miner - static value
• ${env.hostname} - environment property

Via API

InfluxDB2::Client.use('http://localhost:8086', 'my-token',
                      bucket: 'my-bucket',
                      org: 'my-org',
                      precision: InfluxDB2::WritePrecision::NANOSECOND,
                      use_ssl: false,
                      tags: { id: '132-987-655' }) do |client|
  point_settings = InfluxDB2::PointSettings.new(default_tags: { customer: 'California Miner' })
  point_settings.add_default_tag('data_center', '${env.data_center}')
  write_api = client.create_write_api(write_options: InfluxDB2::SYNCHRONOUS,
                                      point_settings: point_settings)
  write_api.write(data: InfluxDB2::Point.new(name: 'h2o')
                                        .add_tag('location', 'europe')
                                        .add_field('level', 2))
end

Delete data

The DeleteApi supports deletes points from an InfluxDB bucket.

InfluxDB2::Client.use('http://localhost:8086', 'my-token',
                      bucket: 'my-bucket',
                      org: 'my-org',
                      precision: InfluxDB2::WritePrecision::NANOSECOND) do |client|
  client.create_delete_api.delete(DateTime.rfc3339('2019-02-03T04:05:06+07:00'),
                                  DateTime.rfc3339('2019-03-03T04:05:06+07:00'),
                                  predicate: 'key1="value1" AND key2="value"')
end

The time range could be specified as:

1. String - "2019-02-03T04:05:06+07:00"
2. DateTime - DateTime.rfc3339('2019-03-03T04:05:06+07:00')
3. Time - Time.utc(2015, 10, 16, 8, 20, 15)

Management API

The client supports following management API:

The following example demonstrates how to use a InfluxDB 2.x Management API to create new bucket. For further information see docs and examples.

#
# This is an example how to create new bucket with permission to write.
#
# You could run example via: `cd apis && bundle exec ruby ../examples/create_new_bucket.rb`
#
$LOAD_PATH.unshift File.expand_path('../lib', __dir__)
require 'influxdb-client'
$LOAD_PATH.unshift File.expand_path('../apis/lib', __dir__)
require 'influxdb-client-apis'
url = 'http://localhost:8086'
bucket = 'my-bucket'
org = 'my-org'
token = 'my-token'
InfluxDB2::Client.use(url,
                      token,
                      bucket: bucket,
                      org: org,
                      use_ssl: false,
                      precision: InfluxDB2::WritePrecision::NANOSECOND) do |client|
  api = InfluxDB2::API::Client.new(client)
  # Find my organization
  organization = api.create_organizations_api
                    .get_orgs
                    .orgs
                    .select { |it| it.name == 'my-org' }
                    .first
  #
  # Create new Bucket
  #
  retention_rule = InfluxDB2::API::RetentionRule.new(type: 'expire', every_seconds: 3600)
  bucket_name = 'new-bucket-name'
  request = InfluxDB2::API::PostBucketRequest.new(org_id: organization.id,
                                                  name: bucket_name,
                                                  retention_rules: [retention_rule])
  bucket = api.create_buckets_api
              .post_buckets(request)
  #
  # Create Permission to read/write from Bucket
  #
  resource = InfluxDB2::API::Resource.new(type: 'buckets',
                                          id: bucket.id,
                                          org_id: organization.id)
  authorization = InfluxDB2::API::Authorization.new(description: "Authorization to read/write bucket: #{bucket.name}",
                                                    org_id: organization.id,
                                                    permissions: [
                                                      InfluxDB2::API::Permission.new(action: 'read', resource: resource),
                                                      InfluxDB2::API::Permission.new(action: 'write', resource: resource)
                                                    ])
  result = api.create_authorizations_api
              .post_authorizations(authorization)
  print("The token: '#{result.token}' is authorized to read/write from/to bucket: '#{bucket.name}'.")
end

• sources - create_new_bucket.rb

Advanced Usage

Check the server status

Server availability can be checked using the client.ping method. That is equivalent of the influx ping.

Proxy configuration

You can configure the client to tunnel requests through an HTTP proxy. To configure the proxy use a http_proxy environment variable.

ENV['HTTP_PROXY'] = 'http://my-user:my-password@my-proxy:8099'

Client automatically follows HTTP redirects. The default redirect policy is to follow up to 10 consecutive requests. You can configure redirect counts by the client property: max_redirect_count.

Due to a security reason Authorization header is not forwarded when redirect leads to a different domain. To overcome this limitation you have to set the client property redirect_forward_authorization to true.

InfluxDB 1.8 API compatibility

InfluxDB 1.8.0 introduced forward compatibility APIs for InfluxDB 2.x. This allow you to easily move from InfluxDB 1.x to InfluxDB 2.x Cloud or open source.

The following forward compatible APIs are available:

For detail info see InfluxDB 1.8 example.

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.