forked from cosmos/cosmos-sdk
-
Notifications
You must be signed in to change notification settings - Fork 1
/
mapper.go
185 lines (159 loc) · 4.79 KB
/
mapper.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
package auth
import (
"bytes"
"fmt"
"reflect"
oldwire "github.com/tendermint/go-wire"
sdk "github.com/cosmos/cosmos-sdk/types"
wire "github.com/cosmos/cosmos-sdk/wire"
)
var _ sdk.AccountMapper = (*accountMapper)(nil)
var _ sdk.AccountMapper = (*sealedAccountMapper)(nil)
// Implements sdk.AccountMapper.
// This AccountMapper encodes/decodes accounts using the
// go-wire (binary) encoding/decoding library.
type accountMapper struct {
// The (unexposed) key used to access the store from the Context.
key sdk.StoreKey
// The prototypical sdk.Account concrete type.
proto sdk.Account
// The wire codec for binary encoding/decoding of accounts.
cdc *wire.Codec
}
// NewAccountMapper returns a new sdk.AccountMapper that
// uses go-wire to (binary) encode and decode concrete sdk.Accounts.
func NewAccountMapper(key sdk.StoreKey, proto sdk.Account) accountMapper {
cdc := wire.NewCodec()
return accountMapper{
key: key,
proto: proto,
cdc: cdc,
}
}
// Create and return a sealed account mapper
func NewAccountMapperSealed(key sdk.StoreKey, proto sdk.Account) sealedAccountMapper {
cdc := wire.NewCodec()
am := accountMapper{
key: key,
proto: proto,
cdc: cdc,
}
RegisterWireBaseAccount(cdc)
// make accountMapper's WireCodec() inaccessible, return
return am.Seal()
}
// Returns the go-wire codec. You may need to register interfaces
// and concrete types here, if your app's sdk.Account
// implementation includes interface fields.
// NOTE: It is not secure to expose the codec, so check out
// .Seal().
func (am accountMapper) WireCodec() *wire.Codec {
return am.cdc
}
// Returns a "sealed" accountMapper.
// The codec is not accessible from a sealedAccountMapper.
func (am accountMapper) Seal() sealedAccountMapper {
return sealedAccountMapper{am}
}
// Implements sdk.AccountMapper.
func (am accountMapper) NewAccountWithAddress(ctx sdk.Context, addr sdk.Address) sdk.Account {
acc := am.clonePrototype()
acc.SetAddress(addr)
return acc
}
// Implements sdk.AccountMapper.
func (am accountMapper) GetAccount(ctx sdk.Context, addr sdk.Address) sdk.Account {
store := ctx.KVStore(am.key)
bz := store.Get(addr)
if bz == nil {
return nil
}
acc := am.decodeAccount(bz)
return acc
}
// Implements sdk.AccountMapper.
func (am accountMapper) SetAccount(ctx sdk.Context, acc sdk.Account) {
addr := acc.GetAddress()
store := ctx.KVStore(am.key)
bz := am.encodeAccount(acc)
store.Set(addr, bz)
}
//----------------------------------------
// sealedAccountMapper
type sealedAccountMapper struct {
accountMapper
}
// There's no way for external modules to mutate the
// sam.accountMapper.ctx from here, even with reflection.
func (sam sealedAccountMapper) WireCodec() *wire.Codec {
panic("accountMapper is sealed")
}
//----------------------------------------
// misc.
// NOTE: currently unused
func (am accountMapper) clonePrototypePtr() interface{} {
protoRt := reflect.TypeOf(am.proto)
if protoRt.Kind() == reflect.Ptr {
protoErt := protoRt.Elem()
if protoErt.Kind() != reflect.Struct {
panic("accountMapper requires a struct proto sdk.Account, or a pointer to one")
}
protoRv := reflect.New(protoErt)
return protoRv.Interface()
} else {
protoRv := reflect.New(protoRt)
return protoRv.Interface()
}
}
// Creates a new struct (or pointer to struct) from am.proto.
func (am accountMapper) clonePrototype() sdk.Account {
protoRt := reflect.TypeOf(am.proto)
if protoRt.Kind() == reflect.Ptr {
protoCrt := protoRt.Elem()
if protoCrt.Kind() != reflect.Struct {
panic("accountMapper requires a struct proto sdk.Account, or a pointer to one")
}
protoRv := reflect.New(protoCrt)
clone, ok := protoRv.Interface().(sdk.Account)
if !ok {
panic(fmt.Sprintf("accountMapper requires a proto sdk.Account, but %v doesn't implement sdk.Account", protoRt))
}
return clone
} else {
protoRv := reflect.New(protoRt).Elem()
clone, ok := protoRv.Interface().(sdk.Account)
if !ok {
panic(fmt.Sprintf("accountMapper requires a proto sdk.Account, but %v doesn't implement sdk.Account", protoRt))
}
return clone
}
}
func (am accountMapper) encodeAccount(acc sdk.Account) []byte {
bz, err := am.cdc.MarshalBinary(acc)
if err != nil {
panic(err)
}
return bz
}
func (am accountMapper) decodeAccount(bz []byte) sdk.Account {
// ... old go-wire ...
r, n, err := bytes.NewBuffer(bz), new(int), new(error)
accI := oldwire.ReadBinary(struct{ sdk.Account }{}, r, len(bz), n, err)
if *err != nil {
panic(*err)
}
acc := accI.(struct{ sdk.Account }).Account
return acc
/*
accPtr := am.clonePrototypePtr()
err := am.cdc.UnmarshalBinary(bz, accPtr)
if err != nil {
panic(err)
}
if reflect.ValueOf(am.proto).Kind() == reflect.Ptr {
return reflect.ValueOf(accPtr).Interface().(sdk.Account)
} else {
return reflect.ValueOf(accPtr).Elem().Interface().(sdk.Account)
}
*/
}