influxdb-client-ruby

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

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

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 1.2.0

Usage

Creating a client

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

client = InfluxDB2::Client.new('https://localhost: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:

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

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

The WriteApi supports synchronous and batching writes into InfluxDB 2.0. In default api uses synchronous write. To enable batching you can use WriteOption.

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')

Batching

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

Property	Description	Default Value
batchSize	the number of data point to collect in batch	1000
flushInterval	the number of milliseconds before the batch is written	1000
retry_interval	the number of milliseconds to retry unsuccessful write. The retry interval is used when the InfluxDB server does not specify "Retry-After" header.	1000
jitter_interval	the number of milliseconds to increase the batch flush interval by a random amount	0

write_options = InfluxDB2::WriteOptions.new(write_type: InfluxDB2::WriteType::BATCHING,
                                            batch_size: 10, flush_interval: 5_000)
client = InfluxDB2::Client.new('http://localhost:9999',
                               'my-token',
                               bucket: 'my-bucket',
                               org: 'my-org',
                               precision: InfluxDB2::WritePrecision::NANOSECOND,
                               use_ssl: false)

write_api = client.create_write_api(write_options: write_options)
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:

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

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])

Delete data

The DeleteApi supports deletes points from an InfluxDB bucket.

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

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"')

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)

Advanced Usage

Check the server status

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

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.