Add Rugged calls to performance bar

This will help diagnose the source of excessive I/O from Rugged
calls. To implement this, we need to obtain the full list of arguments
sent to each request method.

8 files changed, 92 insertions, 9 deletions

diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index 6e8aa5d578e..27032602828 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -55,6 +55,10 @@ module Gitlab
         @name = @relative_path.split("/").last
       end
 
+      def to_s
+        "<#{self.class.name}: #{self.gl_project_path}>"
+      end
+
       def ==(other)
         other.is_a?(self.class) && [storage, relative_path] == [other.storage, other.relative_path]
       end
diff --git a/lib/gitlab/git/rugged_impl/blob.rb b/lib/gitlab/git/rugged_impl/blob.rb
index 9aea736527b..5c73c0c66a9 100644
--- a/lib/gitlab/git/rugged_impl/blob.rb
+++ b/lib/gitlab/git/rugged_impl/blob.rb
@@ -16,7 +16,7 @@ module Gitlab
           override :tree_entry
           def tree_entry(repository, sha, path, limit)
             if use_rugged?(repository, :rugged_tree_entry)
-              wrap_rugged_call { rugged_tree_entry(repository, sha, path, limit) }
+              execute_rugged_call(:rugged_tree_entry, repository, sha, path, limit)
             else
               super
             end
diff --git a/lib/gitlab/git/rugged_impl/commit.rb b/lib/gitlab/git/rugged_impl/commit.rb
index 29ae9bdd851..0eff35ab1c4 100644
--- a/lib/gitlab/git/rugged_impl/commit.rb
+++ b/lib/gitlab/git/rugged_impl/commit.rb
@@ -36,7 +36,7 @@ module Gitlab
           override :find_commit
           def find_commit(repo, commit_id)
             if use_rugged?(repo, :rugged_find_commit)
-              wrap_rugged_call { rugged_find(repo, commit_id) }
+              execute_rugged_call(:rugged_find, repo, commit_id)
             else
               super
             end
@@ -45,7 +45,7 @@ module Gitlab
           override :batch_by_oid
           def batch_by_oid(repo, oids)
             if use_rugged?(repo, :rugged_list_commits_by_oid)
-              wrap_rugged_call { rugged_batch_by_oid(repo, oids) }
+              execute_rugged_call(:rugged_batch_by_oid, repo, oids)
             else
               super
             end
@@ -68,7 +68,7 @@ module Gitlab
         override :commit_tree_entry
         def commit_tree_entry(path)
           if use_rugged?(@repository, :rugged_commit_tree_entry)
-            wrap_rugged_call { rugged_tree_entry(path) }
+            execute_rugged_call(:rugged_tree_entry, path)
           else
             super
           end
diff --git a/lib/gitlab/git/rugged_impl/repository.rb b/lib/gitlab/git/rugged_impl/repository.rb
index 7bed553393c..8fde93e71e2 100644
--- a/lib/gitlab/git/rugged_impl/repository.rb
+++ b/lib/gitlab/git/rugged_impl/repository.rb
@@ -48,7 +48,7 @@ module Gitlab
         override :ancestor?
         def ancestor?(from, to)
           if use_rugged?(self, :rugged_commit_is_ancestor)
-            wrap_rugged_call { rugged_is_ancestor?(from, to) }
+            execute_rugged_call(:rugged_is_ancestor?, from, to)
           else
             super
           end
diff --git a/lib/gitlab/git/rugged_impl/tree.rb b/lib/gitlab/git/rugged_impl/tree.rb
index 479c5f9d8b7..389c9d32ccb 100644
--- a/lib/gitlab/git/rugged_impl/tree.rb
+++ b/lib/gitlab/git/rugged_impl/tree.rb
@@ -16,7 +16,7 @@ module Gitlab
           override :tree_entries
           def tree_entries(repository, sha, path, recursive)
             if use_rugged?(repository, :rugged_tree_entries)
-              wrap_rugged_call { tree_entries_with_flat_path_from_rugged(repository, sha, path, recursive) }
+              execute_rugged_call(:tree_entries_with_flat_path_from_rugged, repository, sha, path, recursive)
             else
               super
             end
diff --git a/lib/gitlab/git/rugged_impl/use_rugged.rb b/lib/gitlab/git/rugged_impl/use_rugged.rb
index badf943e39c..80b75689334 100644
--- a/lib/gitlab/git/rugged_impl/use_rugged.rb
+++ b/lib/gitlab/git/rugged_impl/use_rugged.rb
@@ -11,17 +11,23 @@ module Gitlab
           Gitlab::GitalyClient.can_use_disk?(repo.storage)
         end
 
-        def wrap_rugged_call(&block)
+        def execute_rugged_call(method_name, *args)
           Gitlab::GitalyClient::StorageSettings.allow_disk_access do
             start = Gitlab::Metrics::System.monotonic_time
 
-            result = yield
+            result = send(method_name, *args) # rubocop:disable GitlabSecurity/PublicSend
 
             duration = Gitlab::Metrics::System.monotonic_time - start
 
             if Gitlab::RuggedInstrumentation.active?
               Gitlab::RuggedInstrumentation.increment_query_count
               Gitlab::RuggedInstrumentation.query_time += duration
+
+              Gitlab::RuggedInstrumentation.add_call_details(
+                feature: method_name,
+                args: args,
+                duration: duration,
+                backtrace: Gitlab::Profiler.clean_backtrace(caller))
             end
 
             result
diff --git a/lib/gitlab/rugged_instrumentation.rb b/lib/gitlab/rugged_instrumentation.rb
index 70c06e8b308..8bb8c547ae1 100644
--- a/lib/gitlab/rugged_instrumentation.rb
+++ b/lib/gitlab/rugged_instrumentation.rb
@@ -24,7 +24,24 @@ module Gitlab
     end
 
     def self.active?
-      Gitlab::SafeRequestStore.active?
+      SafeRequestStore.active?
+    end
+
+    def self.peek_enabled?
+      SafeRequestStore[:peek_enabled]
+    end
+
+    def self.add_call_details(details)
+      return unless peek_enabled?
+
+      Gitlab::SafeRequestStore[:rugged_call_details] ||= []
+      Gitlab::SafeRequestStore[:rugged_call_details] << details
+    end
+
+    def self.list_call_details
+      return [] unless peek_enabled?
+
+      Gitlab::SafeRequestStore[:rugged_call_details] || []
     end
   end
 end
diff --git a/lib/peek/views/rugged.rb b/lib/peek/views/rugged.rb
new file mode 100644
index 00000000000..7e2730e2ae4
--- /dev/null
+++ b/lib/peek/views/rugged.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+module Peek
+  module Views
+    class Rugged < View
+      def duration
+        ::Gitlab::RuggedInstrumentation.query_time
+      end
+
+      def calls
+        ::Gitlab::RuggedInstrumentation.query_count
+      end
+
+      def results
+        {
+          duration: formatted_duration,
+          calls: calls,
+          details: details
+        }
+      end
+
+      private
+
+      def details
+        ::Gitlab::RuggedInstrumentation.list_call_details
+          .sort { |a, b| b[:duration] <=> a[:duration] }
+          .map(&method(:format_call_details))
+      end
+
+      def format_call_details(call)
+        call.merge(duration: (call[:duration] * 1000).round(3),
+                   args: format_args(call[:args]))
+      end
+
+      def format_args(args)
+        args.map do |arg|
+          # Needed to avoid infinite as_json calls
+          if arg.is_a?(Gitlab::Git::Repository)
+            arg.to_s
+          else
+            arg
+          end
+        end
+      end
+
+      def formatted_duration
+        ms = duration * 1000
+        if ms >= 1000
+          "%.2fms" % ms
+        else
+          "%.0fms" % ms
+        end
+      end
+    end
+  end
+end