discourse/lib/s3_inventory.rb

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# frozen_string_literal: true
require "aws-sdk-s3"
require "csv"
class S3Inventory
attr_reader :type, :inventory_date, :s3_helper
CSV_KEY_INDEX = 1
CSV_ETAG_INDEX = 2
INVENTORY_PREFIX = "inventory"
INVENTORY_LAG = 2.days
WAIT_AFTER_RESTORE_DAYS = 2
def initialize(
type,
s3_inventory_bucket:,
preloaded_inventory_file: nil,
preloaded_inventory_date: nil,
s3_options: {}
)
@s3_helper = S3Helper.new(s3_inventory_bucket, "", s3_options)
if preloaded_inventory_file && preloaded_inventory_date
# Data preloaded, so we don't need to fetch it again
@preloaded_inventory_file = preloaded_inventory_file
@inventory_date = preloaded_inventory_date
end
if type == :upload
@type = "original"
@model = Upload
@scope = @model.by_users.without_s3_file_missing_confirmed_verification_status
elsif type == :optimized
@type = "optimized"
@scope = @model = OptimizedImage
else
raise "Invalid type: #{type}"
end
end
def backfill_etags_and_list_missing
if !@preloaded_inventory_file && files.blank?
error("Failed to list inventory from S3")
return
end
DistributedMutex.synchronize("s3_inventory_list_missing_#{type}", validity: 30.minutes) do
begin
download_and_decompress_files if !@preloaded_inventory_file
multisite_prefix = Discourse.store.upload_path
ActiveRecord::Base.transaction do
begin
connection.exec(
"CREATE TEMP TABLE #{tmp_table_name}(url text UNIQUE, etag text, PRIMARY KEY(etag, url))",
)
connection.copy_data("COPY #{tmp_table_name} FROM STDIN CSV") do
for_each_inventory_row do |row|
key = row[CSV_KEY_INDEX]
next if Rails.configuration.multisite && key.exclude?(multisite_prefix)
next if key.exclude?("#{type}/")
url = File.join(Discourse.store.absolute_base_url, key)
connection.put_copy_data("#{url},#{row[CSV_ETAG_INDEX]}\n")
end
end
table_name = @model.table_name
# backfilling etags
connection.async_exec(
"UPDATE #{table_name}
SET etag = #{tmp_table_name}.etag
FROM #{tmp_table_name}
WHERE #{table_name}.etag IS NULL AND
#{table_name}.url = #{tmp_table_name}.url",
)
uploads = @scope.where("updated_at < ?", inventory_date)
missing_uploads =
uploads.joins(
"LEFT JOIN #{tmp_table_name} ON #{tmp_table_name}.etag = #{table_name}.etag",
).where("#{tmp_table_name}.etag IS NULL")
exists_with_different_etag =
missing_uploads
.joins(
"LEFT JOIN #{tmp_table_name} inventory2 ON inventory2.url = #{table_name}.url",
)
.where("inventory2.etag IS NOT NULL")
.pluck(:id)
# marking as verified/not verified
if @model == Upload
sql_params = {
inventory_date: inventory_date,
invalid_etag: Upload.verification_statuses[:invalid_etag],
s3_file_missing_confirmed: Upload.verification_statuses[:s3_file_missing_confirmed],
verified: Upload.verification_statuses[:verified],
seeded_id_threshold: @model::SEEDED_ID_THRESHOLD,
}
DB.exec(<<~SQL, sql_params)
UPDATE #{table_name}
SET verification_status = :verified
WHERE etag IS NOT NULL
AND verification_status <> :verified
AND verification_status <> :s3_file_missing_confirmed
AND updated_at < :inventory_date
AND id > :seeded_id_threshold
AND EXISTS
(
SELECT 1
FROM #{tmp_table_name}
WHERE #{tmp_table_name}.etag = #{table_name}.etag
)
SQL
DB.exec(<<~SQL, sql_params)
UPDATE #{table_name}
SET verification_status = :invalid_etag
WHERE verification_status <> :invalid_etag
AND verification_status <> :s3_file_missing_confirmed
AND updated_at < :inventory_date
AND id > :seeded_id_threshold
AND NOT EXISTS
(
SELECT 1
FROM #{tmp_table_name}
WHERE #{tmp_table_name}.etag = #{table_name}.etag
)
SQL
end
if (missing_count = missing_uploads.count) > 0
missing_uploads
.select(:id, :url)
.find_each do |upload|
if exists_with_different_etag.include?(upload.id)
log "#{upload.url} has different etag"
else
log upload.url
end
end
log "#{missing_count} of #{uploads.count} #{@scope.name.underscore.pluralize} are missing"
if exists_with_different_etag.present?
log "#{exists_with_different_etag.count} of these are caused by differing etags"
log "Null the etag column and re-run for automatic backfill"
end
end
set_missing_s3_discourse_stats(missing_count)
ensure
connection.exec("DROP TABLE #{tmp_table_name}") unless connection.nil?
end
end
ensure
cleanup!
end
end
end
def for_each_inventory_row
if @preloaded_inventory_file
CSV.foreach(@preloaded_inventory_file) { |row| yield(row) }
else
files.each { |file| CSV.foreach(file[:filename][0...-3]) { |row| yield(row) } }
end
end
def download_inventory_file_to_tmp_directory(file)
return if File.exist?(file[:filename])
log "Downloading inventory file '#{file[:key]}' to tmp directory..."
failure_message = "Failed to inventory file '#{file[:key]}' to tmp directory."
@s3_helper.download_file(file[:key], file[:filename], failure_message)
end
def decompress_inventory_file(file)
log "Decompressing inventory file '#{file[:filename]}', this may take a while..."
Discourse::Utils.execute_command(
"gzip",
"--decompress",
file[:filename],
failure_message: "Failed to decompress inventory file '#{file[:filename]}'.",
chdir: tmp_directory,
)
end
def prepare_for_all_sites
db_names = RailsMultisite::ConnectionManagement.all_dbs
db_files = {}
db_names.each { |db| db_files[db] = Tempfile.new("#{db}-inventory.csv") }
download_and_decompress_files
for_each_inventory_row do |row|
key = row[CSV_KEY_INDEX]
row_db = key.match(%r{uploads/([^/]+)/})&.[](1)
if row_db && file = db_files[row_db]
file.write(row.to_csv)
end
end
db_names.each { |db| db_files[db].rewind }
db_files
ensure
cleanup!
end
def s3_client
@s3_helper.s3_client
end
private
def cleanup!
return if @preloaded_inventory_file
files.each do |file|
File.delete(file[:filename]) if File.exist?(file[:filename])
File.delete(file[:filename][0...-3]) if File.exist?(file[:filename][0...-3])
end
end
def connection
@connection ||= ActiveRecord::Base.connection.raw_connection
end
def tmp_table_name
"#{type}_inventory"
end
def files
return if @preloaded_inventory_file
@files ||=
begin
symlink_file = unsorted_files.sort_by { |file| -file.last_modified.to_i }.first
return [] if symlink_file.blank?
if BackupMetadata.last_restore_date.present? &&
(symlink_file.last_modified - WAIT_AFTER_RESTORE_DAYS.days) <
BackupMetadata.last_restore_date
set_missing_s3_discourse_stats(0)
return []
end
@inventory_date = symlink_file.last_modified - INVENTORY_LAG
log "Downloading symlink file to tmp directory..."
failure_message = "Failed to download symlink file to tmp directory."
filename = File.join(tmp_directory, File.basename(symlink_file.key))
@s3_helper.download_file(symlink_file.key, filename, failure_message)
return [] if !File.exist?(filename)
File
.readlines(filename)
.map do |key|
2019-02-13 19:26:30 -05:00
key = key.sub("s3://#{bucket_name}/", "").sub("\n", "")
{ key: key, filename: File.join(tmp_directory, File.basename(key)) }
end
end
end
def download_and_decompress_files
files.each do |file|
next if File.exist?(file[:filename][0...-3])
download_inventory_file_to_tmp_directory(file)
decompress_inventory_file(file)
end
end
def tmp_directory
@tmp_directory ||=
begin
current_db = RailsMultisite::ConnectionManagement.current_db
directory = File.join(Rails.root, "tmp", INVENTORY_PREFIX, current_db)
FileUtils.mkdir_p(directory)
directory
end
end
def bucket_name
@s3_helper.s3_bucket_name
end
def bucket_folder_path
@s3_helper.s3_bucket_folder_path
end
def unsorted_files
objects = []
hive_path = File.join(bucket_folder_path, "hive")
@s3_helper.list(hive_path).each { |obj| objects << obj if obj.key.match?(/symlink\.txt\z/i) }
objects
rescue Aws::Errors::ServiceError => e
log("Failed to list inventory from S3", e)
[]
end
def log(message, ex = nil)
puts(message)
Rails.logger.error("#{ex}\n" + (ex.backtrace || []).join("\n")) if ex
end
def error(message)
log(message, StandardError.new(message))
end
def set_missing_s3_discourse_stats(count)
Discourse.stats.set("missing_s3_#{@model.table_name}", count)
end
end