add a tool to detect memory leak.

tools/groonga-check-memory-leak.rb

@@ -0,0 +1,79 @@
+#!/usr/bin/env ruby
+
+unless respond_to?(:spawn, true)
+  puts("Ruby 1.9 is required.")
+  exit(false)
+end
+
+require 'ostruct'
+require 'optparse'
+require 'tempfile'
+require 'stringio'
+
+options = OpenStruct.new
+options.groonga = "groonga"
+options.show_result = false
+
+option_parser = OptionParser.new do |parser|
+  parser.banner += " DATABASE COMMAND_FILE1 ..."
+
+  parser.on("--groonga=PATH",
+            "Use PATH as groonga command path") do |path|
+    options.groonga = path
+  end
+
+  parser.on("--[no-]show-result",
+            "Show result of command") do |boolean|
+    options.show_result = boolean
+  end
+end
+
+database, *command_files = option_parser.parse!(ARGV)
+if database.nil?
+  puts(option_parser)
+  exit(false)
+end
+
+command_files.each do |path|
+  File.open(path) do |file|
+    file.each_line do |command|
+      command = command.chomp
+      base_name = File.basename($0, ".*")
+      log = Tempfile.new("#{base_name}-log")
+      command_file = Tempfile.new("#{base_name}-command")
+      command_file.puts(command)
+      command_file.close
+      command_line = [options.groonga,
+                      "--log-path", log.path,
+                      "--file", command_file.path]
+      command_file << "-n" unless File.exist?(database)
+      command_line << database
+      result = Tempfile.new("#{base_name}-result")
+      pid = spawn(*command_line, :out => result.fileno)
+      pid, status = Process.waitpid2(pid)
+      unless status.success?
+        puts("failed to run: (#{status.exitstatus}): " +
+             "[#{command_line.join(' ')}]")
+        puts("command:")
+        puts(command)
+        puts("result:")
+        result.open
+        puts(result.read)
+        exit(false)
+      end
+      if options.show_result
+        result.open
+        puts(result.read)
+      end
+      log.open
+      log.each_line do |log_line|
+        case log_line
+        when /grn_fin\((\d+)\)/
+          n_unfreed_allocations = $1.to_i
+          puts("maybe memory leak: #{n_unfreed_allocations}: <#{command}>")
+          exit(false)
+        end
+      end
+    end
+  end
+end