Finish the API endpoint for cover upload

src/handlers/log_handler.cr

@@ -0,0 +1,26 @@
+require "kemal"
+require "../logger"
+
+class LogHandler < Kemal::BaseLogHandler
+  def initialize(@logger : Logger)
+  end
+
+  def call(env)
+    elapsed_time = Time.measure { call_next env }
+    elapsed_text = elapsed_text elapsed_time
+    msg = "#{env.response.status_code} #{env.request.method}" \
+          " #{env.request.resource} #{elapsed_text}"
+    @logger.debug msg
+    env
+  end
+
+  def write(msg)
+    @logger.debug msg
+  end
+
+  private def elapsed_text(elapsed)
+    millis = elapsed.total_milliseconds
+    return "#{millis.round(2)}ms" if millis >= 1
+    "#{(millis * 1000).round(2)}µs"
+  end
+end