Samidare

Generate Embulk config and BigQuery schema from MySQL schema and run Embulk.

Add this line to your application's Gemfile:

gem 'samidare'

And then execute:

$ bundle

Or install it yourself as:

$ gem install samidare

Samidare is utility for Embulk . You need to install Embulk and install some gems like below.

embulk gem install embulk-input-mysql --version 0.8.2
embulk gem install embulk-output-bigquery --version 0.4.3
embulk gem install embulk-parser-jsonl --version 0.2.0
embulk gem install embulk-formatter-jsonl --version 0.1.4

Require database.yml and table.yml. Below is a sample config file.

db01:
  host: localhost
  username: root
  password: pswd
  database: production
  bq_dataset: mysql_db01

db02:
  host: localhost
  username: root
  password: pswd
  database: production
  bq_dataset: mysql_db02

Caution: Embulk doesn't allow no password for MySQL

db01:
  tables:
    - name: users
    - name: events
    - name: hobbies

db02:
  tables:
    - name: administrators
    - name: configs

Samidare requires BigQuery parameters like below.

[sample.rb]
require 'samidare'

config = {
 'project_id' => 'BIGQUERY_PROJECT_ID',
 'service_email' => 'SERVICE_ACCOUNT_EMAIL',
 'key' => '/etc/embulk/bigquery.p12',
 'schema_dir' => '/var/tmp/embulk/schema',
 'config_dir' => '/var/tmp/embulk/config',
 'auth_method' => 'private_key'
}

client = Samidare::EmbulkClient.new
client.generate_config(config)
client.run(config)

ruby sample.rb

Samidare returns process status as boolean.
If all tables are succeed, then returns true, else false .
It is useful to control system flow.

process_status = Samidare::EmbulkClient.new.run(config)
exit 1 unless process_status

You can narrow actual target tables from table.yml for test or to retry.
If no target tables is given, Samidare will execute all tables.

# in case, all tables are ['users', 'purchases', 'items']
target_tables = ['users', 'purchases']
Samidare::EmbulkClient.new.run(config, target_tables)

You can set retry count.
If any table failed, only failed table will be retried until retry count.
If no retry count is given, Samidare dosen't retry.

# 2 times retry will execute
Samidare::EmbulkClient.new.run(config, [], 2)

If you set condition to a table in table.yml , SQL is generated like below.
It is useful for large size table.

[table.yml]
production:
  tables:
    - name: users
    - name: events
      conditon: created_at < CURRENT_DATE()

SELECT * FROM users
SELECT * FROM events WHERE created_at < CURRENT_DATE()

BigQuery supports table wildcard expression of a specific set of daily tables, for example, sales20150701 .
If you need daily snapshot of a table for BigQuery, use daily_snapshot option to database.yml or table.yml like below.
daily_snapshot option effects all tables in case of database.yml .
On the other hand, only target table in table.yml .
Daily part is determined by execute date.

[database.yml]
production:
  host: localhost
  username: root
  password: pswd
  database: production
  bq_dataset: mysql
  daily_snapshot: true

[table.yml]
production:
  tables:
    - name: users
    - name: events
      daily_snapshot: true
    - name: hobbies

Only `events` is renamed to `eventsYYYYMMDD` for BigQuery.

1. Fork it ( https://github.com/[my-github-username]/samidare/fork )
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