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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 package prod | |
| 6 | |
| 7 import ( | |
| 8 "time" | |
| 9 | |
| 10 "github.com/luci/gae" | |
| 11 "golang.org/x/net/context" | |
| 12 "google.golang.org/appengine/memcache" | |
| 13 ) | |
| 14 | |
| 15 // useMC adds a gae.Memcache implementation to context, accessible | |
| 16 // by gae.GetMC(c) | |
| 17 func useMC(c context.Context) context.Context { | |
| 18 return gae.SetMCFactory(c, func(ci context.Context) gae.Memcache { | |
| 19 return mcImpl{ci} | |
| 20 }) | |
| 21 } | |
| 22 | |
| 23 type mcImpl struct{ context.Context } | |
| 24 | |
| 25 type mcItem struct { | |
| 26 i *memcache.Item | |
| 27 } | |
| 28 | |
| 29 var _ gae.MCItem = mcItem{} | |
| 30 | |
| 31 func (i mcItem) Key() string { return i.i.Key } | |
| 32 func (i mcItem) Value() []byte { return i.i.Value } | |
| 33 func (i mcItem) Object() interface{} { return i.i.Object } | |
| 34 func (i mcItem) Flags() uint32 { return i.i.Flags } | |
| 35 func (i mcItem) Expiration() time.Duration { return i.i.Expiration } | |
| 36 | |
| 37 func (i mcItem) SetKey(k string) gae.MCItem { | |
| 38 i.i.Key = k | |
| 39 return i | |
| 40 } | |
| 41 func (i mcItem) SetValue(v []byte) gae.MCItem { | |
| 42 i.i.Value = v | |
| 43 return i | |
| 44 } | |
| 45 func (i mcItem) SetObject(o interface{}) gae.MCItem { | |
| 46 i.i.Object = o | |
| 47 return i | |
| 48 } | |
| 49 func (i mcItem) SetFlags(f uint32) gae.MCItem { | |
| 50 i.i.Flags = f | |
| 51 return i | |
| 52 } | |
| 53 func (i mcItem) SetExpiration(d time.Duration) gae.MCItem { | |
| 54 i.i.Expiration = d | |
| 55 return i | |
| 56 } | |
| 57 | |
| 58 // mcR2FErr (MC real-to-fake w/ error) converts a *memcache.Item to a gae.MCItem
, | |
| 59 // and passes along an error. | |
| 60 func mcR2FErr(i *memcache.Item, err error) (gae.MCItem, error) { | |
| 61 if err != nil { | |
| 62 return nil, err | |
| 63 } | |
| 64 return mcItem{i}, nil | |
| 65 } | |
| 66 | |
| 67 // mcF2R (MC fake-to-real) converts a gae.MCItem. i must originate from inside | |
| 68 // this package for this function to work (see the panic message for why). | |
| 69 func mcF2R(i gae.MCItem) *memcache.Item { | |
| 70 if mci, ok := i.(mcItem); ok { | |
| 71 return mci.i | |
| 72 } | |
| 73 panic( | |
| 74 "you may not use other gae.MCItem implementations with this " + | |
| 75 "implementation of gae.Memcache, since it will cause all
CompareAndSwap " + | |
| 76 "operations to fail. Please use the NewItem api instead.
") | |
| 77 } | |
| 78 | |
| 79 // mcMF2R (MC multi-fake-to-real) converts a slice of gae.MCItem to a slice of | |
| 80 // *memcache.Item. | |
| 81 func mcMF2R(items []gae.MCItem) []*memcache.Item { | |
| 82 realItems := make([]*memcache.Item, len(items)) | |
| 83 for i, itm := range items { | |
| 84 realItems[i] = mcF2R(itm) | |
| 85 } | |
| 86 return realItems | |
| 87 } | |
| 88 | |
| 89 func (m mcImpl) NewItem(key string) gae.MCItem { | |
| 90 return mcItem{&memcache.Item{Key: key}} | |
| 91 } | |
| 92 | |
| 93 //////// MCSingleReadWriter | |
| 94 func (m mcImpl) Add(item gae.MCItem) error { | |
| 95 return memcache.Add(m.Context, mcF2R(item)) | |
| 96 } | |
| 97 func (m mcImpl) Set(item gae.MCItem) error { | |
| 98 return memcache.Set(m.Context, mcF2R(item)) | |
| 99 } | |
| 100 func (m mcImpl) Delete(key string) error { | |
| 101 return memcache.Delete(m.Context, key) | |
| 102 } | |
| 103 func (m mcImpl) Get(key string) (gae.MCItem, error) { | |
| 104 return mcR2FErr(memcache.Get(m.Context, key)) | |
| 105 } | |
| 106 func (m mcImpl) CompareAndSwap(item gae.MCItem) error { | |
| 107 return memcache.CompareAndSwap(m.Context, mcF2R(item)) | |
| 108 } | |
| 109 | |
| 110 //////// MCMultiReadWriter | |
| 111 func (m mcImpl) DeleteMulti(keys []string) error { | |
| 112 return gae.FixError(memcache.DeleteMulti(m.Context, keys)) | |
| 113 } | |
| 114 func (m mcImpl) AddMulti(items []gae.MCItem) error { | |
| 115 return gae.FixError(memcache.AddMulti(m.Context, mcMF2R(items))) | |
| 116 } | |
| 117 func (m mcImpl) SetMulti(items []gae.MCItem) error { | |
| 118 return gae.FixError(memcache.SetMulti(m.Context, mcMF2R(items))) | |
| 119 } | |
| 120 func (m mcImpl) GetMulti(keys []string) (map[string]gae.MCItem, error) { | |
| 121 realItems, err := memcache.GetMulti(m.Context, keys) | |
| 122 if err != nil { | |
| 123 return nil, gae.FixError(err) | |
| 124 } | |
| 125 items := make(map[string]gae.MCItem, len(realItems)) | |
| 126 for k, itm := range realItems { | |
| 127 items[k] = mcItem{itm} | |
| 128 } | |
| 129 return items, err | |
| 130 } | |
| 131 func (m mcImpl) CompareAndSwapMulti(items []gae.MCItem) error { | |
| 132 return gae.FixError(memcache.CompareAndSwapMulti(m.Context, mcMF2R(items
))) | |
| 133 } | |
| 134 | |
| 135 //////// MCIncrementer | |
| 136 func (m mcImpl) Increment(key string, delta int64, initialValue uint64) (uint64,
error) { | |
| 137 return memcache.Increment(m.Context, key, delta, initialValue) | |
| 138 } | |
| 139 func (m mcImpl) IncrementExisting(key string, delta int64) (uint64, error) { | |
| 140 return memcache.IncrementExisting(m.Context, key, delta) | |
| 141 } | |
| 142 | |
| 143 //////// MCFlusher | |
| 144 func (m mcImpl) Flush() error { | |
| 145 return memcache.Flush(m.Context) | |
| 146 } | |
| 147 | |
| 148 //////// MCStatter | |
| 149 func (m mcImpl) Stats() (*gae.MCStatistics, error) { | |
| 150 stats, err := memcache.Stats(m.Context) | |
| 151 if err != nil { | |
| 152 return nil, err | |
| 153 } | |
| 154 return (*gae.MCStatistics)(stats), nil | |
| 155 } | |
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