Implement Mail service.

filter/count/mail.go

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package count
+
+import (
+        "github.com/luci/gae/service/mail"
+        "golang.org/x/net/context"
+)
+
+// MailCounter is the counter object for the Mail service.
+type MailCounter struct {
+        Send         Entry
+        SendToAdmins Entry
+}
+
+type mailCounter struct {
+        c *MailCounter
+
+        m mail.Interface
+}
+
+var _ mail.Interface = (*mailCounter)(nil)
+
+func (m *mailCounter) Send(msg *mail.Message) error {
+        return m.c.Send.up(m.m.Send(msg))
+}
+
+func (m *mailCounter) SendToAdmins(msg *mail.Message) error {
+        return m.c.SendToAdmins.up(m.m.SendToAdmins(msg))
+}
+
+func (m *mailCounter) Testable() mail.Testable {
+        return m.m.Testable()
+}
+
+// FilterMail installs a counter Mail filter in the context.
+func FilterMail(c context.Context) (context.Context, *MailCounter) {
+        state := &MailCounter{}
+        return mail.AddFilters(c, func(ic context.Context, u mail.Interface) mail.Interface {
+                return &mailCounter{state, u}
+        }), state
+}