Interface update, per-method Contexts.

filter/featureBreaker/mc.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package featureBreaker
 
 import (
         "golang.org/x/net/context"
 
         mc "github.com/luci/gae/service/memcache"
@@ skipping 19 matching lines @@
 
 func (m *mcState) DeleteMulti(keys []string, cb mc.RawCB) error {
         return m.run(func() error { return m.RawInterface.DeleteMulti(keys, cb) })
 }
 
 func (m *mcState) CompareAndSwapMulti(items []mc.Item, cb mc.RawCB) error {
         return m.run(func() error { return m.RawInterface.CompareAndSwapMulti(items, cb) })
 }
 
 func (m *mcState) Flush() error {
-        return m.run(m.RawInterface.Flush)
+        return m.run(func() error {
+                return m.RawInterface.Flush()
+        })

[iannucci, 2016/09/16 01:01:13]

hm... why was this transformation necessary?

[dnj, 2016/09/16 05:44:42]

Don't remember, un-did it.

 }
 
 func (m *mcState) Stats() (ret *mc.Statistics, err error) {
         err = m.run(func() (err error) {
                 ret, err = m.RawInterface.Stats()
                 return
         })
         return
 }
 
 // FilterMC installs a featureBreaker mc filter in the context.
 func FilterMC(c context.Context, defaultError error) (context.Context, FeatureBreaker) {
         state := newState(defaultError)
         return mc.AddRawFilters(c, func(ic context.Context, rds mc.RawInterface) mc.RawInterface {
                 return &mcState{state, rds}
         }), state
 }