Module: Blazer

Defined in:
lib/blazer.rb,
lib/blazer/engine.rb,
lib/blazer/result.rb,
lib/blazer/version.rb,
lib/blazer/data_source.rb,
app/models/blazer/audit.rb,
app/models/blazer/check.rb,
app/models/blazer/query.rb,
app/models/blazer/record.rb,
lib/blazer/run_statement.rb,
app/models/blazer/dashboard.rb,
app/models/blazer/connection.rb,
lib/blazer/run_statement_job.rb,
app/helpers/blazer/base_helper.rb,
app/mailers/blazer/check_mailer.rb,
lib/blazer/adapters/sql_adapter.rb,
lib/blazer/adapters/base_adapter.rb,
app/models/blazer/dashboard_query.rb,
lib/blazer/adapters/drill_adapter.rb,
lib/blazer/adapters/druid_adapter.rb,
lib/blazer/adapters/athena_adapter.rb,
lib/blazer/adapters/presto_adapter.rb,
lib/blazer/adapters/mongodb_adapter.rb,
lib/blazer/adapters/bigquery_adapter.rb,
lib/blazer/adapters/cassandra_adapter.rb,
lib/blazer/adapters/snowflake_adapter.rb,
app/controllers/blazer/base_controller.rb,
lib/generators/blazer/install_generator.rb,
app/controllers/blazer/checks_controller.rb,
app/controllers/blazer/queries_controller.rb,
lib/blazer/adapters/elasticsearch_adapter.rb,
app/controllers/blazer/dashboards_controller.rb

Defined Under Namespace

Modules: Adapters, BaseHelper, Generators Classes: Audit, BaseController, Check, CheckMailer, ChecksController, Connection, Dashboard, DashboardQuery, DashboardsController, DataSource, Engine, Error, QueriesController, Query, Record, Result, RunStatement, RunStatementJob, TimeoutNotSupported

Constant Summary collapse

TIMEOUT_MESSAGE = 
"Query timed out :("
TIMEOUT_ERRORS = 
[
  "canceling statement due to statement timeout", # postgres
  "canceling statement due to conflict with recovery", # postgres
  "cancelled on user's request", # redshift
  "canceled on user's request", # redshift
  "system requested abort", # redshift
  "maximum statement execution time exceeded" # mysql
]
BELONGS_TO_OPTIONAL = 
{}
VERSION = 
"1.9.0"

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.anomaly_checks ⇒ Object

Returns the value of attribute anomaly_checks.



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# File 'lib/blazer.rb', line 37

def anomaly_checks
  @anomaly_checks
end

.async ⇒ Object

Returns the value of attribute async.



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# File 'lib/blazer.rb', line 38

def async
  @async
end

.audit ⇒ Object

Returns the value of attribute audit.



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# File 'lib/blazer.rb', line 27

def audit
  @audit
end

.before_action ⇒ Object

Returns the value of attribute before_action.



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# File 'lib/blazer.rb', line 32

def before_action
  @before_action
end

.cache ⇒ Object

Returns the value of attribute cache.



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# File 'lib/blazer.rb', line 34

def cache
  @cache
end

.check_schedules ⇒ Object

Returns the value of attribute check_schedules.



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# File 'lib/blazer.rb', line 36

def check_schedules
  @check_schedules
end

.from_email ⇒ Object

Returns the value of attribute from_email.



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# File 'lib/blazer.rb', line 33

def from_email
  @from_email
end

.images ⇒ Object

Returns the value of attribute images.



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# File 'lib/blazer.rb', line 39

def images
  @images
end

.query_editable ⇒ Object

Returns the value of attribute query_editable.



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# File 'lib/blazer.rb', line 41

def query_editable
  @query_editable
end

.query_viewable ⇒ Object

Returns the value of attribute query_viewable.



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# File 'lib/blazer.rb', line 40

def query_viewable
  @query_viewable
end

.time_zone ⇒ Object

Returns the value of attribute time_zone.



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# File 'lib/blazer.rb', line 28

def time_zone
  @time_zone
end

.transform_statement ⇒ Object

Returns the value of attribute transform_statement.



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# File 'lib/blazer.rb', line 35

def transform_statement
  @transform_statement
end

.user_class ⇒ Object 



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# File 'lib/blazer.rb', line 66

def self.user_class
  if !defined?(@user_class)
    @user_class = settings.key?("user_class") ? settings["user_class"] : (User.name rescue nil)
  end
  @user_class
end

.user_method ⇒ Object 



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# File 'lib/blazer.rb', line 73

def self.user_method
  if !defined?(@user_method)
    @user_method = settings["user_method"]
    if user_class
      @user_method ||= "current_#{user_class.to_s.downcase.singularize}"
    end
  end
  @user_method
end

.user_name ⇒ Object

Returns the value of attribute user_name.



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# File 'lib/blazer.rb', line 29

def user_name
  @user_name
end

Class Method Details

.adapters ⇒ Object 



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# File 'lib/blazer.rb', line 189

def self.adapters
  @adapters ||= {}
end

.data_sources ⇒ Object 



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# File 'lib/blazer.rb', line 94

def self.data_sources
  @data_sources ||= begin
    ds = Hash[
      settings["data_sources"].map do |id, s|
        [id, Blazer::DataSource.new(id, s)]
      end
    ]
    ds.default = ds.values.first
    ds

    # TODO Blazer 2.0
    # ds2 = Hash.new { |hash, key| raise Blazer::Error, "Unknown data source: #{key}" }
    # ds.each do |k, v|
    #   ds2[k] = v
    # end
    # ds2
  end
end

.extract_vars(statement) ⇒ Object 



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# File 'lib/blazer.rb', line 113

def self.extract_vars(statement)
  # strip commented out lines
  # and regex {1} or {1,2}
  statement.gsub(/\-\-.+/, "").gsub(/\/\*.+\*\//m, "").scan(/\{\w*?\}/i).map { |v| v[1...-1] }.reject { |v| /\A\d+(\,\d+)?\z/.match(v) || v.empty? }.uniq
end

.register_adapter(name, adapter) ⇒ Object 



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# File 'lib/blazer.rb', line 193

def self.register_adapter(name, adapter)
  adapters[name] = adapter
end

.run_check(check) ⇒ Object 



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# File 'lib/blazer.rb', line 128

def self.run_check(check)
  rows = nil
  error = nil
  tries = 1

  ActiveSupport::Notifications.instrument("run_check.blazer", check_id: check.id, query_id: check.query.id, state_was: check.state) do |instrument|
    # try 3 times on timeout errors
    data_source = data_sources[check.query.data_source]
    statement = check.query.statement
    Blazer.transform_statement.call(data_source, statement) if Blazer.transform_statement

    while tries <= 3
      result = data_source.run_statement(statement, refresh_cache: true, check: check, query: check.query)
      if result.timed_out?
        Rails.logger.info "[blazer timeout] query=#{check.query.name}"
        tries += 1
        sleep(10)
      elsif result.error.to_s.start_with?("PG::ConnectionBad")
        data_source.reconnect
        Rails.logger.info "[blazer reconnect] query=#{check.query.name}"
        tries += 1
        sleep(10)
      else
        break
      end
    end

    begin
      check.reload # in case state has changed since job started
      check.update_state(result)
    rescue ActiveRecord::RecordNotFound
      # check deleted
    end

    # TODO use proper logfmt
    Rails.logger.info "[blazer check] query=#{check.query.name} state=#{check.state} rows=#{result.rows.try(:size)} error=#{result.error}"

    instrument[:statement] = statement
    instrument[:data_source] = data_source
    instrument[:state] = check.state
    instrument[:rows] = result.rows.try(:size)
    instrument[:error] = result.error
    instrument[:tries] = tries
  end
end

.run_checks(schedule: nil) ⇒ Object 



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# File 'lib/blazer.rb', line 119

def self.run_checks(schedule: nil)
  checks = Blazer::Check.includes(:query)
  checks = checks.where(schedule: schedule) if schedule
  checks.find_each do |check|
    next if check.state == "disabled"
    Safely.safely { run_check(check) }
  end
end

.send_failing_checks ⇒ Object 



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# File 'lib/blazer.rb', line 174

def self.send_failing_checks
  emails = {}
  Blazer::Check.includes(:query).where(state: ["failing", "error", "timed out", "disabled"]).find_each do |check|
    check.split_emails.each do |email|
      (emails[email] ||= []) << check
    end
  end

  emails.each do |email, checks|
    Safely.safely do
      Blazer::CheckMailer.failing_checks(email, checks).deliver_now
    end
  end
end

.settings ⇒ Object 



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# File 'lib/blazer.rb', line 83

def self.settings
  @settings ||= begin
    path = Rails.root.join("config", "blazer.yml").to_s
    if File.exist?(path)
      YAML.load(ERB.new(File.read(path)).result)
    else
      {}
    end
  end
end