From 980495a414696864275d029a8d9be91fc30477ab Mon Sep 17 00:00:00 2001
From: Samuel Giddins <segiddins@segiddins.me>
Date: Mon, 29 Aug 2016 14:31:32 -0500
Subject: Add debug logging to the compact index client

---
 .../lib/compact_index_client.rb                    | 29 +++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/lib/bundler/vendor/compact_index_client/lib/compact_index_client.rb b/lib/bundler/vendor/compact_index_client/lib/compact_index_client.rb
index 9ab2722f18..c063c6b4dc 100644
--- a/lib/bundler/vendor/compact_index_client/lib/compact_index_client.rb
+++ b/lib/bundler/vendor/compact_index_client/lib/compact_index_client.rb
@@ -3,6 +3,12 @@ require "pathname"
 require "set"
 
 class Bundler::CompactIndexClient
+  DEBUG_MUTEX = Mutex.new
+  def self.debug
+    return unless ENV["DEBUG_COMPACT_INDEX"]
+    DEBUG_MUTEX.synchronize { warn("[#{self}] #{yield}") }
+  end
+
   class Error < StandardError; end
 
   require "bundler/vendor/compact_index_client/lib/compact_index_client/cache"
@@ -28,17 +34,20 @@ class Bundler::CompactIndexClient
   end
 
   def names
+    Bundler::CompactIndexClient.debug { "/names" }
     update(@cache.names_path, "names")
     @cache.names
   end
 
   def versions
+    Bundler::CompactIndexClient.debug { "/versions" }
     update(@cache.versions_path, "versions")
     versions, @info_checksums_by_name = @cache.versions
     versions
   end
 
   def dependencies(names)
+    Bundler::CompactIndexClient.debug { "dependencies(#{names})" }
     in_parallel.call(names) do |name|
       update_info(name)
       @cache.dependencies(name).map {|d| d.unshift(name) }
@@ -46,11 +55,13 @@ class Bundler::CompactIndexClient
   end
 
   def spec(name, version, platform = nil)
+    Bundler::CompactIndexClient.debug { "spec(name = #{name}, version = #{version}, platform = #{platform})" }
     update_info(name)
     @cache.specific_dependency(name, version, platform)
   end
 
   def update_and_parse_checksums!
+    Bundler::CompactIndexClient.debug { "update_and_parse_checksums!" }
     return @info_checksums_by_name if @parsed_checksums
     update(@cache.versions_path, "versions")
     @info_checksums_by_name = @cache.checksums
@@ -60,15 +71,27 @@ class Bundler::CompactIndexClient
 private
 
   def update(local_path, remote_path)
-    return unless @endpoints.add?(remote_path)
+    Bundler::CompactIndexClient.debug { "update(#{local_path}, #{remote_path})" }
+    unless @endpoints.add?(remote_path)
+      Bundler::CompactIndexClient.debug { "already fetched #{remote_path}" }
+      return
+    end
     @updater.update(local_path, url(remote_path))
   end
 
   def update_info(name)
+    Bundler::CompactIndexClient.debug { "update_info(#{name})" }
     path = @cache.info_path(name)
     checksum = @updater.checksum_for_file(path)
-    return unless existing = @info_checksums_by_name[name]
-    return if checksum == existing
+    unless existing = @info_checksums_by_name[name]
+      Bundler::CompactIndexClient.debug { "skipping updating info for #{name} since it is missing from versions" }
+      return
+    end
+    if checksum == existing
+      Bundler::CompactIndexClient.debug { "skipping updating info for #{name} since the versions checksum matches the local checksum" }
+      return
+    end
+    Bundler::CompactIndexClient.debug { "updating info for #{name} since the versions checksum #{existing} != the local checksum #{checksum}" }
     update(path, "info/#{name}")
   end
 
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