Add a script to calculate a user's storage size from the metadata...

... And write it to Redis

Usage:

   ENVIRONMENT=development ./migrate_storage_size_from_metadata.rb username

migrate_storage_size_from_metadata.rb

@@ -0,0 +1,95 @@
+#!/usr/bin/env ruby
+
+require "rubygems"
+require "bundler/setup"
+require "rest_client"
+require "redis"
+require "yaml"
+require "logger"
+require "active_support/core_ext/hash"
+
+class Migrator
+
+  attr_accessor :username, :base_url, :environment, :settings, :logger
+
+  def initialize(username)
+    @username = username
+
+    @environment = ENV["ENVIRONMENT"] || "staging"
+    @settings = YAML.load(File.read('config.yml'))[@environment]
+
+    @logger = Logger.new("log/migrate_storage_size_from_metadata.log")
+    log_level = ENV["LOGLEVEL"] || "INFO"
+    logger.level = Kernel.const_get "Logger::#{log_level}"
+    logger.progname = username
+  end
+
+  def migrate
+    logger.info "Starting migration for '#{username}'"
+    begin
+      write_storage_size_from_redis_metadata(username)
+    rescue Exception => ex
+      logger.error "Error setting storage size from metadata for '#{username}': #{ex}"
+      # write username to file for later reference
+      File.open('log/failed_migration.log', 'a') { |f| f.puts username }
+      exit 1
+    end
+    logger.info "Finished migration for '#{username}'"
+  end
+
+  def redis
+    @redis ||= Redis.new(@settings["redis"].symbolize_keys)
+  end
+
+  def write_storage_size_from_redis_metadata(user)
+    lua_script = <<-EOF
+      local user = ARGV[1]
+      local total_size = 0
+      local size_key = KEYS[1]
+
+      local function get_size_from_items(parent, directory)
+        local path
+        if parent == "/" then
+          path = directory
+        else
+          path = parent..directory
+        end
+        local items = redis.call("smembers", "rs:m:"..user..":"..path..":items")
+        for index, name in pairs(items) do
+          local redis_key = "rs:m:"..user..":"
+
+          redis_key = redis_key..path..name
+
+          -- if it's a directory, get the items inside of it
+          if string.match(name, "/$") then
+            get_size_from_items(path, name)
+          -- if it's a file, get its size
+          else
+            local file_size = redis.call("hget", redis_key, "s")
+            total_size = total_size + file_size
+          end
+        end
+      end
+
+      get_size_from_items("", "") -- Start from the root
+
+      redis.call("set", size_key, total_size)
+    EOF
+
+    redis.eval(lua_script, ["rs:s:#{user}", "test"], [user])
+  end
+
+end
+
+username = ARGV[0]
+
+unless username
+  puts "No username given."
+  puts "Usage:"
+  puts "ENVIRONMENT=staging ./migrate_storage_size_from_metadata.rb <username>"
+  exit 1
+end
+
+migrator = Migrator.new username
+migrator.migrate
+