Organized rake tasks into separate files

Each namespace now resides in its own file, instead of cluttering Rakefile.

lib/tasks/db.rake

+namespace :db do
+  def create_test_user(id)
+    User.create!(external_id: id, username: "user#{id}")
+  end
+
+  task :init => :environment do
+    puts "recreating indexes..."
+    [Comment, CommentThread, User, Notification, Subscription, Activity, Delayed::Backend::Mongoid::Job].each(&:remove_indexes).each(&:create_indexes)
+    puts "finished"
+  end
+
+  task :clean => :environment do
+    Comment.delete_all
+    CommentThread.delete_all
+    User.delete_all
+    Notification.delete_all
+    Subscription.delete_all
+  end
+
+  THREADS_PER_COMMENTABLE = 20
+  TOP_COMMENTS_PER_THREAD = 3
+  ADDITIONAL_COMMENTS_PER_THREAD = 5
+
+  COURSE_ID = "MITx/6.002x/2012_Fall"
+
+  def generate_comments_for(commentable_id, num_threads=THREADS_PER_COMMENTABLE, num_top_comments=TOP_COMMENTS_PER_THREAD, num_subcomments=ADDITIONAL_COMMENTS_PER_THREAD)
+    level_limit = CommentService.config["level_limit"]
+
+
+    users = User.all.to_a
+
+    puts "Generating threads and comments for #{commentable_id}..."
+
+    threads = []
+    top_comments = []
+    additional_comments = []
+
+    num_threads.times do
+      inner_top_comments = []
+
+      comment_thread = CommentThread.new(commentable_id: commentable_id, body: Faker::Lorem.paragraphs.join("\n\n"), title: Faker::Lorem.sentence(6))
+      comment_thread.author = users.sample
+      comment_thread.course_id = COURSE_ID
+      comment_thread.save!
+      threads << comment_thread
+      users.sample(3).each {|user| user.subscribe(comment_thread)}
+      (1 + rand(num_top_comments)).times do
+        comment = comment_thread.comments.new(body: Faker::Lorem.paragraph(2))
+        comment.author = users.sample
+        comment.endorsed = [true, false].sample
+        comment.comment_thread = comment_thread
+        comment.course_id = COURSE_ID
+        comment.save!
+        top_comments << comment
+        inner_top_comments << comment
+      end
+      previous_level_comments = inner_top_comments
+      (level_limit-1).times do
+        current_level_comments = []
+        (1 + rand(num_subcomments)).times do
+          comment = previous_level_comments.sample
+          sub_comment = comment.children.new(body: Faker::Lorem.paragraph(2))
+          sub_comment.author = users.sample
+          sub_comment.endorsed = [true, false].sample
+          sub_comment.comment_thread = comment_thread
+          sub_comment.course_id = COURSE_ID
+          sub_comment.save!
+          current_level_comments << sub_comment
+        end
+        previous_level_comments = current_level_comments
+      end
+    end
+
+    puts "voting"
+
+    (threads + top_comments + additional_comments).each do |c|
+      users.each do |user|
+        user.vote(c, [:up, :down].sample)
+      end
+    end
+    puts "finished"
+  end
+
+
+  task :generate_comments, [:commentable_id, :num_threads, :num_top_comments, :num_subcomments] => :environment do |t, args|
+    args.with_defaults(:num_threads => THREADS_PER_COMMENTABLE,
+                       :num_top_comments=>TOP_COMMENTS_PER_THREAD,
+                       :num_subcomments=> ADDITIONAL_COMMENTS_PER_THREAD)
+    generate_comments_for(args[:commentable_id], args[:num_threads], args[:num_top_comments], args[:num_subcomments])
+
+  end
+
+  task :bulk_seed, [:num] => :environment do |t, args|
+    Mongoid.configure do |config|
+      config.connect_to("cs_comments_service_bulk_test")
+    end
+    connnection = Mongo::Connection.new("127.0.0.1", "27017")
+    db = Mongo::Connection.new.db("cs_comments_service_bulk_test")
+
+    CommentThread.create_indexes
+    Comment.create_indexes
+    Content.delete_all
+    coll = db.collection("contents")
+    args[:num].to_i.times do
+      doc = {"_type" => "CommentThread", "anonymous" => [true, false].sample, "at_position_list" => [],
+             "tags_array" => [],
+             "comment_count" => 0, "title" => Faker::Lorem.sentence(6), "author_id" => rand(1..10).to_s,
+             "body" => Faker::Lorem.paragraphs.join("\n\n"), "course_id" => COURSE_ID, "created_at" => Time.now,
+             "commentable_id" => COURSE_ID, "closed" => [true, false].sample, "updated_at" => Time.now, "last_activity_at" => Time.now,
+             "votes" => {"count" => 0, "down" => [], "down_count" => 0, "point" => 0, "up" => [], "up_count" => []}}
+      coll.insert(doc)
+    end
+    Tire.index('comment_threads').delete
+    CommentThread.create_elasticsearch_index
+    Tire.index('comment_threads') { import CommentThread.all }
+  end
+
+  task :seed_fast => :environment do
+    ADDITIONAL_COMMENTS_PER_THREAD = 20
+
+    config = YAML.load_file("config/mongoid.yml")[Sinatra::Base.environment]["clients"]["default"]
+    connnection = Mongo::Connection.new(config["hosts"][0].split(":")[0], config["hosts"][0].split(":")[1])
+    db = Mongo::Connection.new.db(config["database"])
+    coll = db.collection("contents")
+    Comment.delete_all
+    CommentThread.each do |thread|
+      ADDITIONAL_COMMENTS_PER_THREAD.times do
+        doc = {"_type" => "Comment", "anonymous" => false, "at_position_list" => [],
+               "author_id" => rand(1..10).to_s, "body" => Faker::Lorem.paragraphs.join("\n\n"),
+               "comment_thread_id" => BSON::ObjectId.from_string(thread.id.to_s), "course_id" => COURSE_ID,
+               "created_at" => Time.now,
+               "endorsed" => [true, false].sample, "parent_ids" => [], "updated_at" => Time.now,
+               "votes" => {"count" => 0, "down" => [], "down_count" => 0, "point" => 0, "up" => [], "up_count" => []}}
+        coll.insert(doc)
+      end
+    end
+  end
+
+  task :seed => :environment do
+
+    Comment.delete_all
+    CommentThread.delete_all
+    User.delete_all
+    Notification.delete_all
+    Subscription.delete_all
+    Tire.index 'comment_threads' do delete end
+    CommentThread.create_elasticsearch_index
+
+    beginning_time = Time.now
+
+    users = (1..10).map {|id| create_test_user(id)}
+    # 3.times do
+    #   other_user = users[1..9].sample
+    #   users.first.subscribe(other_user)
+    # end
+
+    # 10.times do
+    #   user = users.sample
+    #   other_user = users.select{|u| u != user}.sample
+    #   user.subscribe(other_user)
+    # end
+    generate_comments_for("video_1")
+    generate_comments_for("lab_1")
+    generate_comments_for("lab_2")
+
+    end_time = Time.now
+
+    puts "Number of comments generated: #{Comment.count}"
+    puts "Number of comment threads generated: #{CommentThread.count}"
+
+    puts "Time elapsed #{(end_time - beginning_time)*1000} milliseconds"
+
+  end
+
+  task :add_anonymous_to_peers => :environment do
+    Content.collection.find(:anonymous_to_peers=>nil).update_all({"$set" => {'anonymous_to_peers' => false}})
+  end
+
+end

lib/tasks/i18n.rake

+namespace :i18n do
+  desc "Push source strings to Transifex for translation"
+  task :push do
+    sh("tx push -s")
+  end
+
+  desc "Pull translated strings from Transifex"
+  task :pull do
+    sh("tx pull --mode=reviewed --all --minimum-perc=1")
+  end
+
+  desc "Clean the locale directory"
+  task :clean do
+    sh("git clean -f locale/")
+  end
+
+  desc "Commit translated strings to the repository"
+  task :commit => ["i18n:clean", "i18n:pull"] do
+    sh("git add locale")
+    sh("git commit -m 'Updated translations (autogenerated message)'")
+  end
+end

lib/tasks/jobs.rake

+namespace :jobs do
+  desc "Clear the delayed_job queue."
+  task :clear => :environment do
+    Delayed::Job.delete_all
+  end
+
+  desc "Start a delayed_job worker."
+  task :work => :environment do
+    Delayed::Worker.new(:min_priority => ENV['MIN_PRIORITY'], :max_priority => ENV['MAX_PRIORITY'], :queues => (ENV['QUEUES'] || ENV['QUEUE'] || '').split(','), :quiet => false).start
+  end
+end

lib/tasks/search.rake

+namespace :search do
+
+  def get_es_index
+    # we are using the same index for two types, which is against the
+    # grain of Tire's design.  This is why this method works for both
+    # comment_threads and comments.
+    CommentThread.tire.index
+  end
+
+  def get_number_of_primary_shards(index_name)
+    res = Tire::Configuration.client.get "#{Tire::Configuration.url}/#{index_name}/_status"
+    status = JSON.parse res.body
+    status["indices"].first[1]["shards"].size
+  end
+
+  def create_es_index
+    # create the new index with a unique name
+    new_index = Tire.index "#{Content::ES_INDEX_NAME}_#{Time.now.strftime('%Y%m%d%H%M%S')}"
+    new_index.create
+    LOG.info "configuring new index: #{new_index.name}"
+    [CommentThread, Comment].each do |klass|
+      LOG.info "applying index mappings for #{klass.name}"
+      klass.put_search_index_mapping new_index
+    end
+    new_index
+  end
+
+  def import_from_cursor(cursor, index, opts)
+    tot = cursor.count
+    cnt = 0
+    t = Time.now
+    index.import cursor, {:method => :paginate, :per_page => opts[:batch_size]} do |documents|
+      if cnt % opts[:batch_size] == 0 then
+        elapsed_secs = (Time.now - t).round(2)
+        pct_complete = (100 * (cnt/tot.to_f)).round(2)
+        LOG.info "#{index.name}: imported #{cnt} of #{tot} (#{pct_complete}% complete after #{elapsed_secs} seconds)"
+      end
+      cnt += documents.length
+      sleep opts[:sleep_time]
+      documents
+    end
+    LOG.info "#{index.name}: finished importing #{cnt} documents"
+    cnt
+  end
+
+  def move_alias_to(name, index)
+    # if there was a previous index, switch over the alias to point to the new index
+    alias_ = Tire::Alias.find name
+    if alias_ then
+      # does the alias already point to this index?
+      if alias_.indices.include? index.name then
+        return false
+      end
+      # remove the alias from wherever it points to now
+      LOG.info "alias already exists (will move): #{alias_.indices.to_ary.join(',')}"
+      alias_.indices.each do |old_index_name|
+        alias_.indices.delete old_index_name unless old_index_name == name
+      end
+    else
+      # create the alias
+      LOG.info "alias \"#{name}\" does not yet exist - creating."
+      alias_ = Tire::Alias.new :name => name
+    end
+    # point the alias at our new index
+    alias_.indices.add index.name
+    alias_.save
+    LOG.info "alias \"#{name}\" now points to index #{index.name}."
+    true
+  end
+
+  def do_reindex (opts, in_place=false)
+    # get a reference to the model class (and make sure it's a model class with tire hooks)
+
+    start_time = Time.now
+    # create the new index with a unique name
+    new_index = create_es_index
+    # unless the user is forcing a rebuild, or the index does not yet exist, we
+    # can do a Tire api reindex which is much faster than reimporting documents
+    # from mongo.
+    #
+    # Checking if the index exists is tricky.  Tire automatically created an index
+    # for the model class when the app loaded if one did not already exist.  However,
+    # it won't create an alias, which is what our app uses.  So if the index exists
+    # but not the alias, we know that it's auto-created.
+    old_index = get_es_index
+    alias_name = old_index.name
+    alias_ = Tire::Alias.find alias_name
+    if alias_.nil? then
+      # edge case.
+      # the alias doesn't exist, so we know the index was auto-created.
+      # We will delete it and replace it with an alias.
+      raise RuntimeError, 'Cannot reindex in-place, no valid source index' if in_place
+      LOG.warn "deleting auto-created index to make room for the alias"
+      old_index.delete
+      # NOTE on the small chance that another process re-auto-creates the index
+      # we just deleted before we have a chance to create the alias, this next
+      # call will fail.
+      move_alias_to(Content::ES_INDEX_NAME, new_index)
+    end
+
+    op = in_place ? "reindex" : "(re)build index"
+    LOG.info "preparing to #{op}"
+
+    if in_place then
+      # reindex, moving source documents directly from old index to new
+      LOG.info "copying documents from original index (this may take a while!)"
+      old_index.reindex new_index.name
+      LOG.info "done copying!"
+    else
+      # fetch all the documents ever, up til start_time
+      cursor = Content.where(:_type.in => ["Comment", "CommentThread"], :updated_at.lte => start_time)
+      # import them to the new index
+      import_from_cursor(cursor, new_index, opts)
+    end
+
+    # move the alias if necessary
+    did_alias_move = move_alias_to(Content::ES_INDEX_NAME, new_index)
+
+    if did_alias_move then
+      #  Reimport any source documents that got updated since start_time,
+      #  while the alias still pointed to the old index.
+      #  Elasticsearch understands our document ids, so re-indexing the same
+      #  document won't create duplicates.
+      LOG.info "importing any documents that changed between #{start_time} and now"
+      cursor = Content.where(:_type.in => ["Comment", "CommentThread"], :updated_at.gte => start_time)
+      import_from_cursor(cursor, new_index, opts)
+    end
+  end
+
+  desc "Copies contents of MongoDB into Elasticsearch if updated in the last N minutes."
+  task :catchup, [:minutes, :batch_size, :sleep_time] => :environment do |t, args|
+    opts = batch_opts args
+    the_index = get_es_index
+    alias_ = Tire::Alias.find the_index.name
+    # this check makes sure we are working with the index to which
+    # the desired model's alias presently points.
+    raise RuntimeError, "could not find live index" if alias_.nil?
+    start_time = Time.now - (args[:minutes].to_i * 60)
+    cursor = Content.where(:_type.in => ["Comment", "CommentThread"], :updated_at.gte => start_time)
+    import_from_cursor(cursor, the_index, opts)
+  end
+
+  def batch_opts(args)
+    args = args.to_hash
+    { :batch_size => args[:batch_size].nil? ? 500 : args[:batch_size].to_i,
+      :sleep_time => args[:sleep_time].nil? ? 0 : args[:sleep_time].to_i }
+  end
+
+  desc "Removes any data from Elasticsearch that no longer exists in MongoDB."
+  task :prune, [:batch_size, :sleep_time] => :environment do |t, args|
+    opts = batch_opts args
+    the_index = get_es_index
+    puts "pruning #{the_index.name}"
+    alias_ = Tire::Alias.find the_index.name
+    raise RuntimeError, "could not find live index" if alias_.nil?
+    scan_size = opts[:batch_size] / get_number_of_primary_shards(the_index.name)
+    cnt = 0
+    [CommentThread, Comment].each do |klass|
+      doc_type = klass.document_type
+      # this check makes sure we are working with the index to which
+      # the desired model's alias presently points.
+      search = Tire::Search::Scan.new the_index.name, {size: scan_size, type: doc_type}
+      search.each do |results|
+        es_ids = results.map(&:id)
+        mongo_ids = klass.where(:id.in => es_ids).map {|d| d.id.to_s}
+        to_delete = es_ids - mongo_ids
+        if to_delete.size > 0
+          cnt += to_delete.size
+          puts "deleting #{to_delete.size} orphaned #{doc_type} documents from elasticsearch"
+          the_index.bulk_delete (to_delete).map {|v| {"type" => doc_type, "id" => v}}
+        end
+        puts "#{the_index.name}/#{doc_type}: processed #{search.seen} of #{search.total}"
+        sleep opts[:sleep_time]
+      end
+    end
+    puts "done pruning #{the_index.name}, deleted a total of #{cnt} orphaned documents"
+  end
+
+  desc "Rebuild the content index from MongoDB data."
+  task :rebuild, [:batch_size, :sleep_time] => :environment do |t, args|
+    do_reindex(batch_opts(args))
+  end
+
+  desc "Rebuild the content index from already-indexed data (in place)."
+  task :reindex, [:batch_size, :sleep_time] => :environment do |t, args|
+    do_reindex(batch_opts(args), true)
+  end
+
+  desc "Generate a new, empty physical index, without bringing it online."
+  task :create_index => :environment do
+    create_es_index
+  end
+
+end