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Add database tasks to help with dumping DB
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# Source: https://gist.github.com/amit/45e750edde94b70431f5d42caadee423 | ||
namespace :db do | ||
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desc "Dumps the database to backups" | ||
task :dump => :environment do | ||
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dump_fmt = 'p' # 'c' or 'p', 't', 'd' | ||
dump_sfx = suffix_for_format dump_fmt | ||
backup_dir = backup_directory true | ||
cmd = nil | ||
with_config do |app, host, db, user, passw| | ||
file_name = Time.now.strftime("%Y%m%d%H%M%S") + "_" + db + '.' + dump_sfx | ||
# puts "app = #{app}" | ||
# puts "host = #{host}" | ||
# puts "db = #{db}" | ||
# puts "user = #{user}" | ||
# puts "Password = #{passw}" | ||
cmd = "PGPASSWORD=#{passw} pg_dump -F #{dump_fmt} -v -U #{user} -h #{host} -d #{db} -f #{backup_dir}/#{file_name}" | ||
end | ||
puts cmd | ||
exec cmd | ||
end | ||
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desc "Writes forum posts to CSV" | ||
task :csv => :environment do | ||
require "csv" | ||
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file_name = Time.now.strftime("%Y%m%d%H%M%S") + "_posts.csv" | ||
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CSV.open(file_name, "wb") do |csv| | ||
headers = [:id, :author, :topic, :topic_id, :body, :created_at] | ||
csv << headers | ||
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Post.includes(:author, :topic).in_batches do |batch| | ||
batch.each do |post| | ||
csv << [ | ||
post.id, | ||
post.author.username, | ||
post.topic.title, | ||
post.topic_id, | ||
post.body, | ||
post.created_at | ||
] | ||
end | ||
end | ||
end | ||
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puts "Created CSV export at #{filename}" | ||
end | ||
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desc "Show the existing database backups" | ||
task :list => :environment do | ||
backup_dir = backup_directory | ||
puts "#{backup_dir}" | ||
exec "/bin/ls -lt #{backup_dir}" | ||
end | ||
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desc "Restores the database from a backup using PATTERN" | ||
task :restore, [:pat] => :environment do |task,args| | ||
if args.pat.present? | ||
cmd = nil | ||
with_config do |app, host, db, user, passwd| | ||
backup_dir = backup_directory | ||
files = Dir.glob("#{backup_dir}/*#{args.pat}*") | ||
case files.size | ||
when 0 | ||
puts "No backups found for the pattern '#{args.pat}'" | ||
when 1 | ||
file = files.first | ||
fmt = format_for_file file | ||
if fmt.nil? | ||
puts "No recognized dump file suffix: #{file}" | ||
else | ||
cmd = "pg_restore -F #{fmt} -v -c -C #{file}" | ||
end | ||
else | ||
puts "Too many files match the pattern '#{args.pat}':" | ||
puts ' ' + files.join("\n ") | ||
puts "Try a more specific pattern" | ||
end | ||
end | ||
unless cmd.nil? | ||
Rake::Task["db:drop"].invoke | ||
Rake::Task["db:create"].invoke | ||
puts cmd | ||
exec cmd | ||
end | ||
else | ||
puts 'Please pass a pattern to the task' | ||
end | ||
end | ||
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private | ||
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def suffix_for_format suffix | ||
case suffix | ||
when 'c' then 'dump' | ||
when 'p' then 'sql' | ||
when 't' then 'tar' | ||
when 'd' then 'dir' | ||
else nil | ||
end | ||
end | ||
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def format_for_file file | ||
case file | ||
when /\.dump$/ then 'c' | ||
when /\.sql$/ then 'p' | ||
when /\.dir$/ then 'd' | ||
when /\.tar$/ then 't' | ||
else nil | ||
end | ||
end | ||
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def backup_directory create=false | ||
backup_dir = "#{Rails.root}/db/backups" | ||
if create and not Dir.exists?(backup_dir) | ||
puts "Creating #{backup_dir} .." | ||
Dir.mkdir(backup_dir) | ||
end | ||
backup_dir | ||
end | ||
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def with_config | ||
yield Rails.application.class.module_parent_name.underscore, | ||
ActiveRecord::Base.connection_db_config.host, | ||
ActiveRecord::Base.connection_db_config.database, | ||
ActiveRecord::Base.connection_db_config.configuration_hash[:username], | ||
ActiveRecord::Base.connection_db_config.configuration_hash[:password] | ||
end | ||
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end |