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queries_controller.rb
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queries_controller.rb
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module Blazer
class QueriesController < ApplicationController
# skip all filters
skip_filter *_process_action_callbacks.map(&:filter)
protect_from_forgery with: :exception
if ENV["BLAZER_PASSWORD"]
http_basic_authenticate_with name: ENV["BLAZER_USERNAME"], password: ENV["BLAZER_PASSWORD"]
end
layout "blazer/application"
before_action :ensure_database_url
before_action :set_query, only: [:show, :edit, :update, :destroy]
def index
@queries = Blazer::Query.order(:name)
@queries = @queries.includes(:creator) if Blazer.user_class
@trending_queries = Blazer::Audit.group(:query_id).where("created_at > ?", 2.days.ago).having("COUNT(DISTINCT user_id) >= 3").uniq.count(:user_id)
end
def new
@query = Blazer::Query.new(statement: params[:statement])
end
def create
@query = Blazer::Query.new(query_params)
@query.creator = current_user if respond_to?(:current_user) && Blazer.user_class
if @query.save
redirect_to @query
else
render :new
end
end
def show
@statement = @query.statement
process_vars(@statement)
@smart_vars = {}
@sql_errors = []
@bind_vars.each do |var|
query = smart_variables[var]
if query
rows, error = run_statement(query)
@smart_vars[var] = rows.map { |v| v.values.reverse }
@sql_errors << error if error
end
end
end
def edit
end
def run
@statement = params[:statement]
process_vars(@statement)
if @success
@query = Query.find_by(id: params[:query_id]) if params[:query_id]
# audit
if Blazer.audit
audit = Blazer::Audit.new(statement: @statement)
audit.query = @query
audit.user = current_user if respond_to?(:current_user) && Blazer.user_class
audit.save!
end
@rows, @error = run_statement(@statement)
@columns = {}
if @rows.any?
@rows.first.each do |key, value|
@columns[key] =
case value
when Integer
"int"
when Float
"float"
else
"string-ins"
end
end
end
@filename = @query.name.parameterize if @query
@min_width_types = (@rows.first || {}).select { |k, v| v.is_a?(Time) || v.is_a?(String) || smart_columns[k] }.keys
@boom = {}
@columns.keys.each do |key|
query = smart_columns[key]
if query
values = @rows.map { |r| r[key] }.compact.uniq
rows, error = run_statement(ActiveRecord::Base.send(:sanitize_sql_array, [query.sub("{value}", "(?)"), values]))
@boom[key] = Hash[rows.map(&:values)]
end
end
@linked_columns = linked_columns
end
respond_to do |format|
format.html do
render layout: false
end
format.csv do
send_data csv_data(@rows), type: "text/csv; charset=utf-8; header=present", disposition: "attachment; filename=\"#{@query ? @query.name.parameterize : 'query'}.csv\""
end
end
end
def update
if @query.update(query_params)
redirect_to query_path(@query)
else
render :edit
end
end
def destroy
@query.destroy
redirect_to root_url
end
private
def ensure_database_url
render text: "BLAZER_DATABASE_URL required" if !ENV["BLAZER_DATABASE_URL"] && !Rails.env.development?
end
def set_query
@query = Blazer::Query.find(params[:id].to_s.split("-").first)
end
def query_params
params.require(:query).permit(:name, :description, :statement)
end
def csv_data(rows)
CSV.generate do |csv|
if rows.any?
csv << rows.first.keys
end
rows.each do |row|
csv << row.values
end
end
end
def run_statement(statement)
rows = []
error = nil
begin
Blazer::Connection.transaction do
Blazer::Connection.connection.execute("SET statement_timeout = #{Blazer.timeout * 1000}") if Blazer.timeout && postgresql?
result = Blazer::Connection.connection.select_all(statement)
result.each do |untyped_row|
row = {}
untyped_row.each do |k, v|
row[k] = result.column_types.empty? ? v : result.column_types[k].send(:type_cast, v)
end
rows << row
end
raise ActiveRecord::Rollback
end
rescue ActiveRecord::StatementInvalid => e
error = e.message.sub(/.+ERROR: /, "")
end
[rows, error]
end
def extract_vars(statement)
statement.scan(/\{.*?\}/).map { |v| v[1...-1] }.uniq
end
def process_vars(statement)
@bind_vars = extract_vars(statement)
@success = @bind_vars.all? { |v| params[v] }
if @success
@bind_vars.each do |var|
value = params[var].presence
value = value.to_i if value.to_i.to_s == value
if var.end_with?("_at")
value = Blazer.time_zone.parse(value) rescue nil
end
statement.gsub!("{#{var}}", ActiveRecord::Base.connection.quote(value))
end
end
end
def settings
YAML.load(File.read(Rails.root.join("config", "blazer.yml")))
end
def linked_columns
settings["linked_columns"] || {}
end
def smart_columns
settings["smart_columns"] || {}
end
def smart_variables
settings["smart_variables"] || {}
end
def tables
default_schema = postgresql? ? "public" : Blazer::Connection.connection_config[:database]
schema = Blazer::Connection.connection_config[:schema] || default_schema
rows, error = run_statement(Blazer::Connection.send(:sanitize_sql_array, ["SELECT table_name, column_name, ordinal_position, data_type FROM information_schema.columns WHERE table_schema = ?", schema]))
Hash[rows.group_by { |r| r["table_name"] }.map { |t, f| [t, f.sort_by { |f| f["ordinal_position"] }.map { |f| f.slice("column_name", "data_type") }] }.sort_by { |t, _f| t }]
end
helper_method :tables
def postgresql?
Blazer::Connection.connection.adapter_name == "PostgreSQL"
end
end
end