release: add a logger for release tasks

GitHub: groongaGH-43

In this PR, we add a logger for release tasks.
Our log will be output in `log/error.log`.

ansible/files/home/packages/webhook/lib/deployer/app.rb

@@ -17,6 +17,7 @@
 require "json"
 require "openssl"
 require_relative "error"
+require_relative "logger"
 require_relative "payload"
 require_relative "response"
 
@@ -94,7 +95,8 @@ def process_payload!(payload)
     def deploy(payload)
       Thread.new do
         # TODO: call rake tasks for sign packages.
-        # TODO: write down the errors into log files.
+      rescue => e
+        Logger.log("error.log", e.message)
       end
     end
   end

ansible/files/home/packages/webhook/lib/deployer/logger.rb

@@ -0,0 +1,58 @@
+# Copyright (C) 2018  Kouhei Sutou <[email protected]>
+# Copyright (C) 2024  Takuya Kodama <[email protected]>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+require "pathname"
+
+module Deployer
+  class Logger
+    LOG_DIR = "log".freeze
+
+    class << self
+      def log(base_name, object)
+        new(base_name).log(object)
+      end
+    end
+
+    def initialize(base_name)
+      @log_dir = prepare_log_dir
+      @base_name = base_name
+      @log_path = log_dir + base_name
+    end
+
+    def log(object)
+      begin
+        File.open(@log_path, "w") do |log|
+          if object.is_a?(String)
+            log.puts(object)
+          else
+            PP.pp(object, log)
+          end
+        end
+      rescue SystemCallError
+      end
+    end
+
+    private
+
+    def prepare_log_dir
+      log_dir = Pathname.new(LOG_DIR)
+      return log_dir if log_dir.directory?
+
+      Pathname.mkdir(LOG_DIR)
+      log_dir
+    end
+  end
+end