forked from OpenNeo/impress
Create swf_assets:manifests:load task to save all manifest files
Doing that sweet, sweet backfill!! It's not exactly *fast*, since there's about 570k records to work through, but it's pretty good all things considered! Thanks, surprisingly-reusable async code!
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2 changed files with 98 additions and 60 deletions
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@ -117,10 +117,12 @@ class SwfAsset < ApplicationRecord
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end
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def manifest
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raise "manifest_url is blank" if manifest_url.blank?
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NeopetsMediaArchive.load_json(manifest_url)
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end
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def preload_manifest
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raise "manifest_url is blank" if manifest_url.blank?
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NeopetsMediaArchive.preload_file(manifest_url)
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end
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@ -251,7 +253,14 @@ class SwfAsset < ApplicationRecord
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# NeopetsMediaArchive will share a pool of persistent connections for
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# them.
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swf_assets.map do |swf_asset|
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semaphore.async { swf_asset.preload_manifest }
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semaphore.async do
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begin
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swf_asset.preload_manifest
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rescue StandardError => error
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Rails.logger.error "Could not preload manifest for asset " +
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"#{swf_asset.id} (#{swf_asset.manifest_url}): #{error.message}"
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end
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end
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end
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# Wait until all tasks are done.
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@ -35,75 +35,104 @@ namespace :swf_assets do
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end
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end
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desc "Backfill manifest_url for SwfAsset models"
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task manifests: [:environment] do
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timeout = ENV.fetch("TIMEOUT", "5").to_i
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namespace :manifests do
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desc "Save all known manifests to the Neopets Media Archive"
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task load: [:environment] do
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# Log errors to STDOUT, but we don't need the info messages about
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# successful saves.
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Rails.logger = Logger.new(STDOUT, level: :error)
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assets = SwfAsset.where(manifest_url: nil)
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count = assets.count
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puts "Found #{count} assets without manifests"
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# Find all the manifests with known URLs. (We don't have a database
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# filter for "do we already have the manifest downloaded", but that's
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# okay, the preload method will quickly check that for us!)
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swf_assets = SwfAsset.where.not(manifest_url: nil)
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total_count = swf_assets.count
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puts "Found #{total_count} assets with manifests"
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Async do
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# Share a pool of persistent connections, rather than reconnecting on
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# each request. (This library does that automatically!)
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internet = Async::HTTP::Internet.instance
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# Load the assets in batches, then process each batch in two steps: first
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# inferring all manifest URLs in the batch, then saving all assets in the
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# batch. (This makes the update step more efficient, and it also avoids
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# simultaneous queries across the fibers, which ActiveRecord disallows!)
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#
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# We keep track of a shared index `i` here, but we only actually
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# increment it once each task is *done*, so that the numbers output in
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# the right order!
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i = 0
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assets.find_in_batches(batch_size: 1000) do |batch|
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# Create a barrier, to let us wait on all the tasks; then under it
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# create a semaphore, to limit how many tasks run at once.
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barrier = Async::Barrier.new
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semaphore = Async::Semaphore.new(100, parent: barrier)
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batch.each do |asset|
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semaphore.async do |task|
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manifest_url = nil
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begin
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task.with_timeout(timeout) do
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manifest_url = infer_manifest_url(asset.url, internet)
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end
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rescue StandardError => error
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i += 1
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puts "[#{i}/#{count}] ⚠️ Skipping #{asset.id}: #{error.message}"
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next
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end
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i += 1
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puts "[#{i}/#{count}] Manifest for #{asset.id}: #{manifest_url}"
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# Write, but don't yet save, the manifest URL.
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asset.manifest_url = manifest_url
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end
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# For each batch of 1000 assets, load their manifests concurrently.
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# Wrap everything in a top-level sync, so keyboard interrupts will
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# propagate all the way up to here, instead of just cancelling the
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# current batch.
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Sync do
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saved_count = 0
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swf_assets.find_in_batches(batch_size: 1000) do |swf_assets|
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SwfAsset.preload_manifests(swf_assets)
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saved_count += swf_assets.size
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puts "Loaded #{saved_count} of #{total_count} manifests"
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end
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end
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end
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# Wait for all the above tasks to finish. (Then, all of the assets that
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# succeeded should have an unsaved `manifest_url` change.)
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barrier.wait
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desc "Backfill manifest_url for SwfAsset models"
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task urls: [:environment] do
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timeout = ENV.fetch("TIMEOUT", "5").to_i
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# Save all of the assets in the batch. (We do this in a transaction not
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# for the transactional semantics, but because it's notably faster than
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# doing a commit between each query, which is what sending the queries
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# individually would effectively do!)
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begin
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SwfAsset.transaction do
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batch.each do |asset|
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assets = SwfAsset.where(manifest_url: nil)
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count = assets.count
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puts "Found #{count} assets without manifests"
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Sync do
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# Share a pool of persistent connections, rather than reconnecting on
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# each request. (This library does that automatically!)
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internet = Async::HTTP::Internet.instance
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# Load the assets in batches, then process each batch in two steps: first
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# inferring all manifest URLs in the batch, then saving all assets in the
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# batch. (This makes the update step more efficient, and it also avoids
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# simultaneous queries across the fibers, which ActiveRecord disallows!)
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#
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# We keep track of a shared index `i` here, but we only actually
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# increment it once each task is *done*, so that the numbers output in
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# the right order!
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i = 0
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assets.find_in_batches(batch_size: 1000) do |batch|
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# Create a barrier, to let us wait on all the tasks; then under it
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# create a semaphore, to limit how many tasks run at once.
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barrier = Async::Barrier.new
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semaphore = Async::Semaphore.new(100, parent: barrier)
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batch.each do |asset|
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semaphore.async do |task|
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manifest_url = nil
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begin
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asset.save!
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task.with_timeout(timeout) do
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manifest_url = infer_manifest_url(asset.url, internet)
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end
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rescue StandardError => error
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puts "⚠️ Saving asset #{asset.id} failed: #{error.full_message}"
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i += 1
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puts "[#{i}/#{count}] ⚠️ Skipping #{asset.id}: #{error.message}"
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next
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end
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i += 1
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puts "[#{i}/#{count}] Manifest for #{asset.id}: #{manifest_url}"
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# Write, but don't yet save, the manifest URL.
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asset.manifest_url = manifest_url
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end
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end
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rescue StandardError => error
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puts "⚠️ Saving this batch failed: #{error.full_message}"
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# Wait for all the above tasks to finish. (Then, all of the assets that
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# succeeded should have an unsaved `manifest_url` change.)
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barrier.wait
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# Save all of the assets in the batch. (We do this in a transaction not
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# for the transactional semantics, but because it's notably faster than
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# doing a commit between each query, which is what sending the queries
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# individually would effectively do!)
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begin
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SwfAsset.transaction do
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batch.each do |asset|
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begin
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asset.save!
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rescue StandardError => error
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puts "⚠️ Saving asset #{asset.id} failed: #{error.full_message}"
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end
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end
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end
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rescue StandardError => error
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puts "⚠️ Saving this batch failed: #{error.full_message}"
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end
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end
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end
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end
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