fluent-plugin-gcloud-pubsub-custom

This plugin is forked from https://github.com/mdoi/fluent-plugin-gcloud-pubsub

Overview

Google Cloud Pub/Sub Input/Output(BufferedOutput) plugin for Fluentd with google-cloud gem

• Publish messages to Google Cloud Pub/Sub
• Pull messages from Google Cloud Pub/Sub

Preparation

• Create a project on Google Developer Console
• Add a topic of Cloud Pub/Sub to the project
• Add a pull style subscription to the topic
• Download your credential (json) or set scope on GCE instance

When using output plugin, you need to grant Pub/Sub Publisher and Pub/Sub Viewer role to IAM.

Also, when using input plugin, you need to grant Pub/Sub Subscriber and Pub/Sub Viewer role to IAM.

Requirements

fluent-plugin-gcloud-pubsub-custom	fluentd	ruby
>= 1.0.0	>= v0.14.0	>= 2.1
< 1.0.0	>= v0.12.0	>= 1.9

Installation

Install by gem:

$ gem install fluent-plugin-gcloud-pubsub-custom

Caution

This plugin doesn't work in td-agent.

Please use in Fluentd installed by gem.

Configuration

Publish messages

Use gcloud_pubsub output plugin.

<match example.publish>
  @type gcloud_pubsub
  project <YOUR PROJECT>
  key <YOUR KEY>
  topic <YOUR TOPIC>
  autocreate_topic false
  max_messages 1000
  max_total_size 9800000
  max_message_size 4000000
  endpoint <Endpoint URL>
  emulator_host <PUBSUB_EMULATOR_HOST>
  timeout 60
  <buffer>
    @type memory
    flush_interval 1s
  </buffer>
  <format>
    @type json
  </format>
</match>

• project (optional)
  • Set your GCP project.
  • Running fluentd on GCP, you don't have to specify.
  • You can also use environment variable such as GCLOUD_PROJECT.
• key (optional)
  • Set your credential file path.
  • Running fluentd on GCP, you can use scope instead of specifying this.
  • You can also use environment variable such as GCLOUD_KEYFILE.
• topic (required)
  • Set topic name to publish.
  • You can use placeholder in this param. See: https://docs.fluentd.org/v1.0/articles/buffer-section
• dest_project (optional, default: nil)
  • Set your destination GCP project if you publish messages cross project.
• autocreate_topic (optional, default: false)
  • If set to true, specified topic will be created when it doesn't exist.
• max_messages (optional, default: 1000)
  • Publishing messages count per request to Cloud Pub/Sub.
    • See https://cloud.google.com/pubsub/quotas#other_limits
• max_total_size (optional, default: 9800000 = 9.8MB)
  • Publishing messages bytesize per request to Cloud Pub/Sub. This parameter affects only message size. You should specify a little smaller value than quota.
    • See https://cloud.google.com/pubsub/quotas#other_limits
• max_message_size (optional, default: 4000000 = 4MB)
  • Messages exceeding max_message_size are not published because Pub/Sub clients cannot receive it.
• attribute_keys (optional, default: [])
  • Publishing the set fields as attributes generated from input message.
• attribute_key_values (optional, default: {})
  • Publishing the set fields as attributes generated from input params
• endpoint(optional)
  • Set Pub/Sub service endpoint. For more information, see Service Endpoints
• compression (optional, default: nil)
  • If set to gzip, messages will be compressed with gzip.
• emulator_host(optional)
  • Host name of the emulator. For more information, see Testing apps locally with the emulator
• timeout (optional)
  • Set default timeout to use in publish requests.

Pull messages

Use gcloud_pubsub input plugin.

<source>
  @type gcloud_pubsub
  tag example.pull
  project <YOUR PROJECT>
  key <YOUR KEY>
  topic <YOUR TOPIC>
  subscription <YOUR SUBSCRIPTION>
  max_messages 1000
  return_immediately true
  pull_interval 0.5
  pull_threads 2
  parse_error_action exception
  enable_rpc true
  rpc_bind 0.0.0.0
  rpc_port 24680
  <parse>
    @type json
  </parse>
</source>

• tag (required)
  • Set tag of messages.
  • If tag_key is specified, tag is used as tag when record don't have specified key.
• tag_key (optional)
  • Set key to be used as tag.
• project (optional)
  • Set your GCP project
  • Running fluentd on GCP, you don't have to specify.
  • You can also use environment variable such as GCLOUD_PROJECT.
• key (optional)
  • Set your credential file path.
  • Running fluentd on GCP, you can use scope instead of specifying this.
  • You can also use environment variable such as GCLOUD_KEYFILE.
• topic (optional)
  • Set topic name that the subscription belongs to.
• subscription (required)
  • Set subscription name to pull.
• max_messages (optional, default: 100)
  • See maxMessages on https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.subscriptions/pull
• return_immediately (optional, default: true)
  • See returnImmediately on https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.subscriptions/pull
  • If return_immediately is true or pulling message is stopped by HTTP RPC, this plugin wait pull_interval each pull.
• pull_interval (optional, default: 5.0)
  • Pulling messages by intervals of specified seconds.
• pull_threads (optional, default: 1)
  • Set number of threads to pull messages.
• attribute_keys (optional, default: [])
  • Specify the key of the attribute to be emitted as the field of record.
• parse_error_action (optional, default: exception)
  • Set error type when parsing messages fails.
    • exception: Raise exception. Messages are not acknowledged.
    • warning: Only logging as warning.
• enable_rpc (optional, default: false)
  • If true is specified, HTTP RPC to stop or start pulling message is enabled.
• rpc_bind (optional, default: 0.0.0.0)
  • Bind IP address for HTTP RPC.
• rpc_port (optional, default: 24680)
  • Port for HTTP RPC.
• decompression (optional, default: nil)
  • If set to gzip, messages will be decompressed with gzip.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

TODO

• Add tag attribute in output plugin and use tag attribute as tag in input plugin.
• Send ack after other output plugin committed (if possible).

Authors

• @mdoi : First author
• @mia-0032 : This version author