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data_source.rb
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data_source.rb
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module Blazer
class DataSource
extend Forwardable
attr_reader :id, :settings
def_delegators :adapter_instance, :schema, :tables, :preview_statement, :reconnect, :cost, :explain, :cancel, :supports_cohort_analysis?, :cohort_analysis_statement
def initialize(id, settings)
@id = id
@settings = settings
end
def adapter
settings["adapter"] || detect_adapter
end
def name
settings["name"] || @id
end
def linked_columns
settings["linked_columns"] || {}
end
def smart_columns
settings["smart_columns"] || {}
end
def smart_variables
settings["smart_variables"] || {}
end
def variable_defaults
settings["variable_defaults"] || {}
end
def timeout
settings["timeout"]
end
def cache
@cache ||= begin
if settings["cache"].is_a?(Hash)
settings["cache"]
elsif settings["cache"]
{
"mode" => "all",
"expires_in" => settings["cache"]
}
else
{
"mode" => "off"
}
end
end
end
def cache_mode
cache["mode"]
end
def cache_expires_in
(cache["expires_in"] || 60).to_f
end
def cache_slow_threshold
(cache["slow_threshold"] || 15).to_f
end
def local_time_suffix
@local_time_suffix ||= Array(settings["local_time_suffix"])
end
def result_cache
@result_cache ||= Blazer::ResultCache.new(self)
end
def run_results(run_id)
result_cache.read_run(run_id)
end
def delete_results(run_id)
result_cache.delete_run(run_id)
end
def sub_variables(statement, vars)
statement = statement.dup
vars.each do |var, value|
# use block form to disable back-references
statement.gsub!("{#{var}}") { quote(value) }
end
statement
end
def run_statement(statement, options = {})
statement = Statement.new(statement, self) if statement.is_a?(String)
statement.bind unless statement.bind_statement
result = nil
if cache_mode != "off"
if options[:refresh_cache]
clear_cache(statement) # for checks
else
result = result_cache.read_statement(statement)
end
end
unless result
comment = "blazer"
if options[:user].respond_to?(:id)
comment << ",user_id:#{options[:user].id}"
end
if options[:user].respond_to?(Blazer.user_name)
# only include letters, numbers, and spaces to prevent injection
comment << ",user_name:#{options[:user].send(Blazer.user_name).to_s.gsub(/[^a-zA-Z0-9 ]/, "")}"
end
if options[:query].respond_to?(:id)
comment << ",query_id:#{options[:query].id}"
end
if options[:check]
comment << ",check_id:#{options[:check].id},check_emails:#{options[:check].emails}"
end
if options[:run_id]
comment << ",run_id:#{options[:run_id]}"
end
result = run_statement_helper(statement, comment, options)
end
if options[:async] && options[:run_id]
run_id = options[:run_id]
begin
result_cache.write_run(run_id, result)
rescue
result = Blazer::Result.new(self, [], [], "Error storing the results of this query :(", nil, false)
result_cache.write_run(run_id, result)
end
end
result
end
def clear_cache(statement)
result_cache.delete_statement(statement)
end
def quote(value)
if quoting == :backslash_escape || quoting == :single_quote_escape
# only need to support types generated by process_vars
if value.is_a?(Integer) || value.is_a?(Float)
value.to_s
elsif value.nil?
"NULL"
else
value = value.to_formatted_s(:db) if value.is_a?(ActiveSupport::TimeWithZone)
if quoting == :backslash_escape
"'#{value.gsub("\\") { "\\\\" }.gsub("'") { "\\'" }}'"
else
"'#{value.gsub("'", "''")}'"
end
end
elsif quoting.respond_to?(:call)
quoting.call(value)
elsif quoting.nil?
raise Blazer::Error, "Quoting not specified"
else
raise Blazer::Error, "Unknown quoting"
end
end
def bind_params(statement, variables)
if parameter_binding == :positional
locations = []
variables.each do |k, v|
i = 0
while (idx = statement.index("{#{k}}", i))
locations << [v, idx]
i = idx + 1
end
end
variables.each do |k, v|
statement = statement.gsub("{#{k}}", "?")
end
[statement, locations.sort_by(&:last).map(&:first)]
elsif parameter_binding == :numeric
variables.each_with_index do |(k, v), i|
# add trailing space if followed by digit
# try to keep minimal to avoid fixing invalid queries like SELECT{var}
statement = statement.gsub(/#{Regexp.escape("{#{k}}")}(\d)/, "$#{i + 1} \\1").gsub("{#{k}}", "$#{i + 1}")
end
[statement, variables.values]
elsif parameter_binding.respond_to?(:call)
parameter_binding.call(statement, variables)
elsif parameter_binding.nil?
[sub_variables(statement, variables), []]
else
raise Blazer::Error, "Unknown bind parameters"
end
end
protected
def adapter_instance
@adapter_instance ||= begin
# TODO add required settings to adapters
unless settings["url"] || Rails.env.development? || ["bigquery", "athena", "snowflake", "salesforce"].include?(settings["adapter"])
raise Blazer::Error, "Empty url for data source: #{id}"
end
unless Blazer.adapters[adapter]
raise Blazer::Error, "Unknown adapter"
end
Blazer.adapters[adapter].new(self)
end
end
def quoting
@quoting ||= adapter_instance.quoting
end
def parameter_binding
@parameter_binding ||= adapter_instance.parameter_binding
end
def run_statement_helper(statement, comment, options)
start_time = Blazer.monotonic_time
columns, rows, error =
if adapter_instance.parameter_binding
adapter_instance.run_statement(statement.bind_statement, comment, statement.bind_values)
else
adapter_instance.run_statement(statement.bind_statement, comment)
end
duration = Blazer.monotonic_time - start_time
cache = !error && (cache_mode == "all" || (cache_mode == "slow" && duration >= cache_slow_threshold))
result = Blazer::Result.new(self, columns, rows, error, cache ? Time.now : nil, false)
if cache && adapter_instance.cachable?(statement.bind_statement)
begin
result_cache.write_statement(statement, result, expires_in: cache_expires_in.to_f * 60)
# set just_cached after caching
result.just_cached = true
rescue
# do nothing
end
end
result.cached_at = nil
result
end
# TODO check for adapter with same name, default to sql
def detect_adapter
scheme = settings["url"].to_s.split("://").first
case scheme
when "presto", "cassandra", "ignite"
scheme
else
"sql"
end
end
end
end