Close http connection in perform method of Request class (#6889)

HTTP connections must be explicitly closed in many cases, and letting
perform method close connections makes its callers less redundant and
prevent them from forgetting to close connections.

6 files changed, 67 insertions, 61 deletions

diff --git a/app/services/fetch_atom_service.rb b/app/services/fetch_atom_service.rb
index c07859845..48ad5dcd3 100644
--- a/app/services/fetch_atom_service.rb
+++ b/app/services/fetch_atom_service.rb
@@ -24,43 +24,44 @@ class FetchAtomService < BaseService
 
   def process(url, terminal = false)
     @url = url
-    perform_request
-    process_response(terminal)
+    perform_request { |response| process_response(response, terminal) }
   end
 
-  def perform_request
+  def perform_request(&block)
     accept = 'text/html'
     accept = 'application/activity+json, application/ld+json, application/atom+xml, ' + accept unless @unsupported_activity
 
-    @response = Request.new(:get, @url)
-                       .add_headers('Accept' => accept)
-                       .perform
+    Request.new(:get, @url).add_headers('Accept' => accept).perform(&block)
   end
 
-  def process_response(terminal = false)
-    return nil if @response.code != 200
+  def process_response(response, terminal = false)
+    return nil if response.code != 200
 
-    if @response.mime_type == 'application/atom+xml'
-      [@url, { prefetched_body: @response.to_s }, :ostatus]
-    elsif ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(@response.mime_type)
-      json = body_to_json(@response.to_s)
+    if response.mime_type == 'application/atom+xml'
+      [@url, { prefetched_body: response.to_s }, :ostatus]
+    elsif ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(response.mime_type)
+      json = body_to_json(response.to_s)
       if supported_context?(json) && json['type'] == 'Person' && json['inbox'].present?
-        [json['id'], { prefetched_body: @response.to_s, id: true }, :activitypub]
+        [json['id'], { prefetched_body: response.to_s, id: true }, :activitypub]
       elsif supported_context?(json) && json['type'] == 'Note'
-        [json['id'], { prefetched_body: @response.to_s, id: true }, :activitypub]
+        [json['id'], { prefetched_body: response.to_s, id: true }, :activitypub]
       else
         @unsupported_activity = true
         nil
       end
-    elsif @response['Link'] && !terminal && link_header.find_link(%w(rel alternate))
-      process_headers
-    elsif @response.mime_type == 'text/html' && !terminal
-      process_html
+    elsif !terminal
+      link_header = response['Link'] && parse_link_header(response)
+
+      if link_header&.find_link(%w(rel alternate))
+        process_link_headers(link_header)
+      elsif response.mime_type == 'text/html'
+        process_html(response)
+      end
     end
   end
 
-  def process_html
-    page = Nokogiri::HTML(@response.to_s)
+  def process_html(response)
+    page = Nokogiri::HTML(response.to_s)
 
     json_link = page.xpath('//link[@rel="alternate"]').find { |link| ['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(link['type']) }
     atom_link = page.xpath('//link[@rel="alternate"]').find { |link| link['type'] == 'application/atom+xml' }
@@ -71,7 +72,7 @@ class FetchAtomService < BaseService
     result
   end
 
-  def process_headers
+  def process_link_headers(link_header)
     json_link = link_header.find_link(%w(rel alternate), %w(type application/activity+json)) || link_header.find_link(%w(rel alternate), ['type', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'])
     atom_link = link_header.find_link(%w(rel alternate), %w(type application/atom+xml))
 
@@ -81,7 +82,7 @@ class FetchAtomService < BaseService
     result
   end
 
-  def link_header
-    @link_header ||= LinkHeader.parse(@response['Link'].is_a?(Array) ? @response['Link'].first : @response['Link'])
+  def parse_link_header(response)
+    LinkHeader.parse(response['Link'].is_a?(Array) ? response['Link'].first : response['Link'])
   end
 end
diff --git a/app/services/fetch_link_card_service.rb b/app/services/fetch_link_card_service.rb
index 8f252e64c..26deb5ecc 100644
--- a/app/services/fetch_link_card_service.rb
+++ b/app/services/fetch_link_card_service.rb
@@ -36,15 +36,24 @@ class FetchLinkCardService < BaseService
 
   def process_url
     @card ||= PreviewCard.new(url: @url)
-    res     = Request.new(:head, @url).perform
 
-    return if res.code != 405 && (res.code != 200 || res.mime_type != 'text/html')
+    failed = Request.new(:head, @url).perform do |res|
+      res.code != 405 && (res.code != 200 || res.mime_type != 'text/html')
+    end
 
-    @response = Request.new(:get, @url).perform
+    return if failed
 
-    return if @response.code != 200 || @response.mime_type != 'text/html'
+    Request.new(:get, @url).perform do |res|
+      if res.code == 200 && res.mime_type == 'text/html'
+        @html = res.to_s
+        @html_charset = res.charset
+      else
+        @html = nil
+        @html_charset = nil
+      end
+    end
 
-    @html = @response.to_s
+    return if @html.nil?
 
     attempt_oembed || attempt_opengraph
   end
@@ -118,7 +127,7 @@ class FetchLinkCardService < BaseService
     detector = CharlockHolmes::EncodingDetector.new
     detector.strip_tags = true
 
-    guess = detector.detect(@html, @response.charset)
+    guess = detector.detect(@html, @html_charset)
     page  = Nokogiri::HTML(@html, nil, guess&.fetch(:encoding, nil))
 
     if meta_property(page, 'twitter:player')
diff --git a/app/services/resolve_account_service.rb b/app/services/resolve_account_service.rb
index fd6d30605..034821dc0 100644
--- a/app/services/resolve_account_service.rb
+++ b/app/services/resolve_account_service.rb
@@ -179,11 +179,10 @@ class ResolveAccountService < BaseService
   def atom_body
     return @atom_body if defined?(@atom_body)
 
-    response = Request.new(:get, atom_url).perform
-
-    raise Mastodon::UnexpectedResponseError, response unless response.code == 200
-
-    @atom_body = response.to_s
+    @atom_body = Request.new(:get, atom_url).perform do |response|
+      raise Mastodon::UnexpectedResponseError, response unless response.code == 200
+      response.to_s
+    end
   end
 
   def actor_json
diff --git a/app/services/send_interaction_service.rb b/app/services/send_interaction_service.rb
index fabba8a3e..3419043e5 100644
--- a/app/services/send_interaction_service.rb
+++ b/app/services/send_interaction_service.rb
@@ -12,11 +12,9 @@ class SendInteractionService < BaseService
 
     return if !target_account.ostatus? || block_notification?
 
-    delivery = build_request.perform
-
-    raise Mastodon::UnexpectedResponseError, delivery unless delivery.code > 199 && delivery.code < 300
-
-    delivery.connection&.close
+    build_request.perform do |delivery|
+      raise Mastodon::UnexpectedResponseError, delivery unless delivery.code > 199 && delivery.code < 300
+    end
   end
 
   private
diff --git a/app/services/subscribe_service.rb b/app/services/subscribe_service.rb
index 2f725e2ec..2893b5410 100644
--- a/app/services/subscribe_service.rb
+++ b/app/services/subscribe_service.rb
@@ -6,21 +6,21 @@ class SubscribeService < BaseService
 
     @account        = account
     @account.secret = SecureRandom.hex
-    @response       = build_request.perform
-
-    if response_failed_permanently?
-      # We're not allowed to subscribe. Fail and move on.
-      @account.secret = ''
-      @account.save!
-    elsif response_successful?
-      # The subscription will be confirmed asynchronously.
-      @account.save!
-    else
-      # The response was either a 429 rate limit, or a 5xx error.
-      # We need to retry at a later time. Fail loudly!
-      raise Mastodon::UnexpectedResponseError, @response
+
+    build_request.perform do |response|
+      if response_failed_permanently? response
+        # We're not allowed to subscribe. Fail and move on.
+        @account.secret = ''
+        @account.save!
+      elsif response_successful? response
+        # The subscription will be confirmed asynchronously.
+        @account.save!
+      else
+        # The response was either a 429 rate limit, or a 5xx error.
+        # We need to retry at a later time. Fail loudly!
+        raise Mastodon::UnexpectedResponseError, response
+      end
     end
-    @response.connection&.close
   end
 
   private
@@ -47,12 +47,12 @@ class SubscribeService < BaseService
   end
 
   # Any response in the 3xx or 4xx range, except for 429 (rate limit)
-  def response_failed_permanently?
-    (@response.status.redirect? || @response.status.client_error?) && !@response.status.too_many_requests?
+  def response_failed_permanently?(response)
+    (response.status.redirect? || response.status.client_error?) && !response.status.too_many_requests?
   end
 
   # Any response in the 2xx range
-  def response_successful?
-    @response.status.success?
+  def response_successful?(response)
+    response.status.success?
   end
 end
diff --git a/app/services/unsubscribe_service.rb b/app/services/unsubscribe_service.rb
index 01f5c6b7a..95c1fb4fc 100644
--- a/app/services/unsubscribe_service.rb
+++ b/app/services/unsubscribe_service.rb
@@ -7,10 +7,9 @@ class UnsubscribeService < BaseService
     @account = account
 
     begin
-      @response = build_request.perform
-
-      Rails.logger.debug "PuSH unsubscribe for #{@account.acct} failed: #{@response.status}" unless @response.status.success?
-      @response.connection&.close
+      build_request.perform do |response|
+        Rails.logger.debug "PuSH unsubscribe for #{@account.acct} failed: #{response.status}" unless response.status.success?
+      end
     rescue HTTP::Error, OpenSSL::SSL::SSLError => e
       Rails.logger.debug "PuSH unsubscribe for #{@account.acct} failed: #{e}"
     end